WO1997046044A1 - Method and apparatus for high rate data transmission in a spread spectrum communication system - Google Patents

Method and apparatus for high rate data transmission in a spread spectrum communication system Download PDF

Info

Publication number
WO1997046044A1
WO1997046044A1 PCT/US1997/009287 US9709287W WO9746044A1 WO 1997046044 A1 WO1997046044 A1 WO 1997046044A1 US 9709287 W US9709287 W US 9709287W WO 9746044 A1 WO9746044 A1 WO 9746044A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
high rate
additional
channel
channel assignment
Prior art date
Application number
PCT/US1997/009287
Other languages
French (fr)
Inventor
Edward G. Tiedemann, Jr.
Yu-Cheun Jou
Joseph P. Odenwalder
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to EP97928730A priority Critical patent/EP0903051B1/en
Priority to DE69734652T priority patent/DE69734652T2/en
Priority to JP54298497A priority patent/JP3679132B2/en
Priority to IL12724397A priority patent/IL127243A/en
Priority to BRPI9709482-0A priority patent/BR9709482B1/en
Priority to AT97928730T priority patent/ATE310365T1/en
Priority to AU32914/97A priority patent/AU716886B2/en
Publication of WO1997046044A1 publication Critical patent/WO1997046044A1/en
Priority to FI982579A priority patent/FI982579A/en
Priority to HK99104096A priority patent/HK1019390A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters

Definitions

  • the present invention relates to communications. More particularly, the present invention relates to a novel and improved communication system wherein a user transmits data on a primary channel. However, when the user's transmission exceeds the capacity of the primary channel, the user is provided use of an additional channel or set of channels for use in conjunction with the primary channel to enable the transmission of high rate data.
  • the present invention provides for dynamic channel assignment for the transmission of high rate data and provides a highly efficient system for the transmission of variable rate data.
  • the present invention is concerned with multiple users sharing a communications resource such as in a cellular CDMA system.
  • CDMA code division multiple access
  • Other multiple access communication techniques such as time division multiple access (TDMA), frequency division multiple access (FDMA) and AM modulation schemes such as amplitude companded single sideband (ACSSB) are known in the art.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • AM modulation schemes such as amplitude companded single sideband (ACSSB)
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • AM modulation schemes such as amplitude companded single sideband (ACSSB)
  • CDMA has significant advantages over these other modulation techniques for multiple access communication systems.
  • the use of CDMA techniques in a multiple access communication system is disclosed in U.S. Patent No.
  • Path diversity is obtained by exploiting the multipath environment through spread spectrum processing by allowing a signal arriving with different propagation delays to be received and processed separately. Furthermore, space or path diversity is obtained by providing multiple signal paths through simultaneous links between a mobile user and two or more base stations. Examples of the utilization of path diversity are illustrated in U.S. Patent No. 5,109,390 entitled “DIVERSITY RECEIVER IN A CDMA CELLULAR TELEPHONE SYSTEM", and U.S. Patent No. 5,101,501 entitled “SOFT HANDOFF IN A CDMA CELLULAR TELEPHONE SYSTEM", both assigned to the assignee of the present invention and incorporated by reference herein.
  • variable rate data source is a variable rate vocoder which is detailed in U.S. Patent No. 5,414,796, entitled "VARIABLE RATE VOCODER,” assigned to the assignee of the present invention and incorporated herein by reference. Since speech inherently contains periods of silence, i.e. pauses, the amount of data required to represent these periods can be reduced. Variable rate vocoding most effectively exploits this fact by reducing the data rate for these silent periods.
  • a variable rate speech encoder provides speech data at full rate when the talker is actively speaking, thus using the full capacity of the transmission frames.
  • a variable rate speech coder is providing speech data at a less than maximum rate, there is excess capacity in the transmission frames.
  • a method for transmitting additional data in transmission frames of a fixed size, wherein the data source is providing data at a variable rate is described in detail in U.S. Patent No. 5,504,773, entitled “METHOD AND APPARATUS FOR THE FORMATTING OF DATA FOR TRANSMISSION", assigned to the assignee of the present invention and incorporated by reference herein.
  • a method and apparatus is disclosed for combining data of differing types from different sources in a data packet for transmission.
  • a communications resource is typically divided into communications channels.
  • the present invention is described in the context of a CDMA communication system, wherein each channel is provided by spreading the data by a different spreading sequence.
  • the spreading sequences used are orthogonal Walsh sequences.
  • each user is provided with a dedicated channel, referred to herein as the primary channel.
  • each user is provided with selective access to a pool of common channels, referred to herein as additional channels which can be shared by all users of the communication system.
  • the communication system determines whether sufficient additional channels are available for the transmission of the high rate data. If sufficient additional channels are available, they are assigned to the user for transmission of the high rate data.
  • the transmitter sends a message, referred to herein as the first channel assignment message, to the receiver indicating a forthcoming high rate data transmission.
  • the channel assignment message identifies the additional channels that will be used to support the high rate data service.
  • the first channel assignment message is transmitted two frames in advance of the high rate transmission. By using the first channel assignment message the receiving system need not demodulate all possible channels at all times which greatly reduces power consumption of the mobile station.
  • a secondary channel assignment message containing the same information as the first channel assignment message is provided on the primary channel at the onset of the high rate data communication. This provides a second indication of the high rate data transmission which can be relied upon if the frame carrying the first channel assignment message is not properly received.
  • the receiving system initializes a set of additional demodulators to demodulate the high rate data in accordance with the information provided in the first channel assignment message.
  • the high rate data is demodulated by the primary channel demodulator and the additional channel demodulators and the demodulated frames are combined and provided to the user.
  • the receiving system demodulates all possible additional channels as though a first channel assignment message had been received in the erased frame.
  • the receiving system uses the secondary channel assignment message to re-assemble the frame and to initialize the additional demodulators for receiving the next frames.
  • Figure 1 is a diagram illustrating an exemplary implementation of the present invention in a mobile communication system
  • FIG. 2 is a block diagram of the transmission system of the present invention.
  • FIG. 3 is a block diagram of a receiver system of the present invention.
  • a multiple access communication resource is divided into channels.
  • This division is usually called multiplexing, three specific types being: frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM).
  • FDM frequency division multiplexing
  • TDM time division multiplexing
  • CDM code division multiplexing
  • FIG. 1 illustrates an exemplary implementation of the present invention in a mobile communication system.
  • Mobile station 10 transmits information to and receives information from cell base station 12.
  • Cell base station 12 in turn, transmits information to and receives information from mobile telephone switching office (MTSO) 14.
  • MTSO 14 in turn, transmits information to and receives information from a public switching telephone network (not shown).
  • the signals transmitted by cell base station 12 to mobile station 10 are spread spectrum signals as are the signals transmitted from mobile station 10 to cell base station 12.
  • the generation of spread spectrum communication signals is described in detail in the aforementioned U.S. Patent Nos. 4,901,307 and 5,103,459.
  • the exemplary embodiment of the present invention is described in terms of a method for providing high rate data packets from cell base station 12 to mobile station 10 referred to herein as forward link transmissions.
  • the present invention is equally applicable to the reverse link transmission of data from mobile station 10 to cell base station 12.
  • mobile station 10 is assigned a primary channel for communications with base station 12.
  • a single channel is provided by a unique Walsh spreading sequence as is described in detail in the aforementioned U.S. Patent Nos. 4,901,307 and 5,103,459.
  • cell base station 12 uses additional channels to provide high rate data transmission to mobile station 10.
  • high rate data packets are those which require more capacity than the primary channel for their transmission.
  • the data is transmitted in packets. If a packet contains high rate data, its contents are divided into a plurality of frames, each of which can be transmitted on a single channel and recombined at the receiver.
  • FIG. 2 illustrates a block diagram of the exemplary embodiment of the transmission system of the present invention.
  • Data source 20 provides the packets of data for transmission from cell base station 12 to mobile station 10.
  • Data source 20 is provided for illustrative purposes. It should be noted that bases station 12 is typically relaying information from remote location and data source 20 is simply a convenient way to illustrate a source of the packets of data for transmission.
  • Data source 20 can provide both packets of data less than capacity limits of the primary channel and high rate data requiring the use of the primary channel plus one or more additional channels to carry the packet.
  • data source 20 provides the packet of data through de-multiplexer (DE-MUX) 22 to primary formatter 24.
  • primary formatter 24 generates a set of redundant bits for the packet in accordance with error correction and detection methods that are well known in the art.
  • formatter 24 generates a set of cyclic redundancy check (CRC) bits and a set of code tail bits and appends those sets of bits to the outgoing packet, the generation of which is detailed in the aforementioned U.S. Patent No. 5,550,773.
  • CRC cyclic redundancy check
  • Primary formatter 24 outputs the packet to primary encoder 26 which encodes the packet to provide encoded symbols.
  • primary encoder 26 is a rate 1/2 convolutional encoder, the design and implementation of which are well known in the art.
  • the convolutional encoder is implemented using a digital shift register.
  • Primary encoder 26 provides the encoded data packet to primary interleaver 28.
  • Primary interleaver 28 reorders the binary digits of the encoded packet in accordance with a predetermined reordering format.
  • primary interleaver 28 is a block interleaver. In a block interleaver, the data is written into memory in columns and output in rows. In conjunction with error correcting code, interleaving increases the time diversity of the data, and therefore increases the robustness against bursty channel errors.
  • the interleaved packet is provided by primary interleaver 28 to primary modulator 30.
  • Primary modulator 30 modulate the frames in order to provide the frame on the assigned primary channel.
  • modulator 30 is a code division multiple access (CDMA) modulator as described in detail in U.S. Patent Nos. 4,901,307 and 5,103,459.
  • CDMA code division multiple access
  • each frame is spread by a Walsh sequence (W n ) that is unique to that channel and orthogonal to all other Walsh sequences used by all other channels upon which data is transmitted from base station 12.
  • data on the primary channel can be variable rate in accordance with the industry standard TIA/EIA/IS-95- A Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System, whereas data provided on the additional channels is scheduled at a fixed rate.
  • the spread frame is then covered using a pseudorandom noise (PN) sequence which provides greater separation in code space and identification for each base station 12.
  • PN pseudorandom noise
  • Each channel is distinguished uniquely by its Walsh sequence. There are a limited number of available orthogonal sequences, so the greater the number of users transmitting at high rates the fewer the number of users that can be accommodated by base station 12.
  • Modulator 30 provides the modulated frame to transmitter (TMTR) 36, which frequency upconverts and amplifies the modulated frame, and transmits the signal through antenna 38.
  • data source 20 prepares to transmit high rate data packet, it provides a request signal (REQ) to cell controller 40 of cell base station 12.
  • Cell controller 40 responds by providing an acknowledgment of the request (ACK).
  • Cell controller 40 selects additional channels which will be used for the transmission of the high rate data.
  • the pool of possible additional channels that can be used for the transmission of high rate data is pre-defined so that selection can be performed by a simple masking technique as is well known in the art.
  • sets of additional channels are predefined and channel assignment messages simply identify one of the predefined sets.
  • the pre-defined sets consist of different number of additional channels.
  • Cell controller 40 generates a channel assignment message, which indicates the additional Walsh channel or channels that will be used to carry the high rate data two frames (40 ms) later and provides that message to primary formatter 24.
  • the channel assignment message can be provided with its own CRC check bits to provide additional reliability or can be transmitted without the its own check bits using only a minimum number of additional bits. If the present invention is to be used in a time division multiple access communication system, then the channel assignment messages would specify additional time slots where data will be provided to mobile station 10. Similarly if the present invention is applied to a frequency division multiple access communication system, then the channel assignment messages would specify additional frequencies which will be used to provide data to mobile station 10.
  • the channel assignment message is provided as additional signaling data which is combined with the outgoing data on the primary channel.
  • the channel assignment message transmitted in advance of the onset of the high rate data transmissions is referred to herein as the first channel assignment message.
  • a method for combining outgoing traffic data with signaling data is described in detail in the aforementioned U.S. Patent No. 5,550,773.
  • the first channel assignment message is punctured into the outgoing data frame on the primary channel by methods well known in the art.
  • the frame containing the first channel assignment message is formatted as described above by primary formatter 24 and encoded by primary encoder 26 as described above.
  • the encoded symbols are then provided to primary interleaver 28 which reorders the symbols as described above.
  • the channel assignment message, signaling messages (if they exist), control messages (if they exist) and part of the data are all transmitted on the primary channel by primary modulator 30, the additional channels only carry data.
  • power control bits if they exist are punctured into the primary channel data to provide closed loop power control of the type described in the aforementioned U.S. Patent 5,109,501.
  • the primary channel can be variable or fixed rate or it can be used as a dedicated control channel.
  • the modulated frame is upconverted and amplified by transmitter 34 and transmitted through antenna 36.
  • the first channel assignment message is provided two frames in advance of the onset of high rate data transmissions to provide sufficient time for the receiver (illustrated in FIG. 3) to prepare for its reception.
  • the additional channels are grouped by cell controller 40 and transmitted to mobile station 10.
  • this group of additional channels can be updated during the call. Defining the set of possible additional channels in advance allows the channel assignment message to require only a few bits to identify the channels to be used. Instead of sending a signal identifying the additional channels to be used, the base station can send a mask signal that will allow high rate demodulation controller 117 to identify the additional channels.
  • the present invention provides the channel assignment information redundantly in a secondary channel assignment message transmitted on the primary channel.
  • data source 20 provides the high rate data packet to de-multiplexer 22.
  • De-multiplexer 22 divides the high rate data packet into two parts. The first part is contained in a frame to be transmitted on the primary channel. The second part is contained in frames to be transmitted on additional channels. The frame to be transmitted on the primary channel is processed as described above.
  • Additional formatter 25 generates a set of CRC bits for the incoming data and a set of code tail bits.
  • the formatted data from additional formatter 25 is provided to additional encoder 27 which encodes the data to provide encoded symbols.
  • additional encoder 27 is a convolutional encoder.
  • the encoded symbols are provided to additional interleaver 29, which as described above reorders the encoded symbols in accordance with a predetermined ordering format.
  • the interleavers use the same number of addresses but variable words size to accommodate different sized blocks of data for interleaving.
  • the interleavers use a variable number of addresses and a fixed word size to accommodate varying block size.
  • the reordered encoded symbols are provided to de-multiplexer (DE- MUX) 35 which divides the additional frame into frames each of which is carried on an additional channel.
  • DE- MUX de-multiplexer
  • Each of the additional frames from de-multiplexer 35 is provided to a different one of additional modulators 32a-32n.
  • the modulated additional frames from additional modulators 32a-32n are combined with the modulated frame from primary modulator 30 by transmitter 34 before transmission.
  • Transmitter 34 upconverts and amplifies the combined signal and transmits that signal through antenna 36.
  • the signal broadcast through antenna 36 of FIG. 2 is received at the by antenna 110 and provided to receiver (RCVR) 112.
  • Receiver 112 downconverts, filters and amplifies the received signal and provides the received signal to demodulation circuit 111.
  • Demodulation circuit 111 represents one "finger" of a RAKE receiver should such a design be used.
  • a RAKE receiver implementation multipath signals received at mobile station 10 with different propagation path delays are demodulated separately and the results of those demodulation operations are then combined in finger combiner 128.
  • the design and implementation of a RAKE receiver is described in detail in aforementioned U.S. Patent No. 5,109,390.
  • primary demodulator 114 and additional demodulators 120a-120n are CDMA demodulators as disclosed in the aforementioned U.S. Patent Nos. 4,901,307 and 5,103,459.
  • primary demodulator 114 and additional demodulators 120a-120n are quadrature phase shift keying (QPSK) demodulators.
  • QPSK quadrature phase shift keying
  • Primary demodulator 114 despreads the received signal in accordance with the allocated primary channel Walsh sequence and PN code.
  • the de- spread primary frame is provided to finger combiner 128, which combines the primary frame soft decision from finger demodulator 111 with soft decisions from other fingers to provide an improved soft decision.
  • the improved soft decisions are provided to primary de-interleaver 118, which reorders the demodulated soft decisions in accordance with a predetermined re-ordering format.
  • de-interleavers 118 and 124 either operate using a fixed number of addresses and variable word size or a fixed word size and variable number of addresses to accommodate different sized data packets.
  • De-interleaver 118 provides the reordered frame to primary decoder 122, which decodes the frame.
  • primary decoder 122 and additional decoder 126 are Viterbi decoders, the design and implementation of which are well known in the art.
  • the decoded frame from primary decoder 122 is provided through multiplexer 127 to data sink 130 which could be the user of mobile station 10 or further processing elements.
  • High rate data controller 117 If the frame containing a first channel assignment message is received without error, then the decoded channel assignment message is provided to high rate data controller 117.
  • High data rate controller can be implemented using a microprocessor programmed to perform the necessary functions.
  • High rate data controller 117 provides the necessary Walsh sequence identification and PN code information to additional demodulators 120a- 120n to demodulate the additional data.
  • the RF signal is received by antenna 110 and provided to receiver 112.
  • Receiver 112 amplifies and down converts the received signal and provides the received signal to primary demodulator 114 and additional demodulators 120a-120n.
  • the demodulated primary frame from the primary channel is provided to finger combiner 128 to provide improved demodulated soft decisions as described above.
  • the improved soft decisions are provided to primary de-interleaver 118 which re-orders the soft decisions as described above.
  • the reordered frame is provided to primary decoder 122 which decodes the de-interleaved frame and provides the decoded frame to multiplexer (MUX) 127.
  • MUX multiplexer
  • the received signal is also provided to additional demodulators 120a- 120n which demodulate the signals in accordance with the channel information provided in the first channel assignment message.
  • the demodulated frames of data from additional demodulators 120a-120n are provided to finger combiner 128 to generate improved soft decisions for each of the additional frames.
  • the improved soft decisions of the demodulated frames are provides to multiplexer (MUX) 123 which re ⁇ assembles the packet containing the additional data.
  • multiplexer 123 operates in accordance with a signal from high rate demodulation controller 117 which indicates the additional demodulators that are being used and how to re-assemble the packet containing additional data.
  • the re-assembled packet of additional data is provided to additional de-interleaver 124 which re-orders the soft decisions in accordance with a predetermined de-interleaving format.
  • the reordered soft decisions are provided to additional decoder 126.
  • primary decoder 122 and additional decoder 126 can be implemented using the same hardware, such as a microprocessor programmed to perform the specified function or an application specific integrated circuit (ASIC) designed to perform the specified function.
  • Additional decoder 126 decodes the additional packet of data and provides the decoded bits to multiplexer 127.
  • Multiplexer (MUX) 127 combines the decoded data transmitted on the primary channel with the decoded data transmitted on the additional channels.
  • the reassembled data packet is provided to data sink 103.
  • the receiver system will operate on the basis of a worst case scenario.
  • the receiver will demodulate the maximum set of additional channels possible and it will demodulate the last such set used. It will then decide which frames from additional channels are to be used as valid data once the secondary channel assignment message for the current data packet is properly decoded. If both frames containing the first and secondary channel assignment messages are received in error, then the corresponding received data will be discarded and an erasure is declared.
  • the present invention is equally applicable to variable rate data transmission and fixed rate transmission.
  • the channel assignment message data will typically remain constant throughout the service. However should the need for additional channels arise for signaling or other data traffic, the channel assignment messages will be allowed to vary to indicate the additional channel to be used for the transmission of that data.
  • the scheduling is done so that only the necessary number of additional channels for the current data packet size are assigned. The number of additional channels to be assigned depends on the amount of data to be sent. This could be done on a frame by frame basis.

Abstract

The present invention is a method and apparatus for transmitting high rate data packet in a CDMA communication system. The transmission system transmits a first channel assignment message indicating the at least one additional channel that will be used to support the high rate data packet. The first channel assignment message is sent in advance of the onset of high rate data communications. In addition the present invention provides within the first frame of high rate data a duplicate channel assignment message. A remote receiver uses the channel assignment messages to initialize its demodulation elements (114 and 120) to receive the additional information carried on the at least one additional channel.

Description

METHOD AND APPARATUS FOR HIGH RATE DATA TRANSMISSION IN A SPREAD SPECTRUM COMMUNICATION SYSTEM
BACKGROUND OF THE INVENTION
I. Field of the Invention
The present invention relates to communications. More particularly, the present invention relates to a novel and improved communication system wherein a user transmits data on a primary channel. However, when the user's transmission exceeds the capacity of the primary channel, the user is provided use of an additional channel or set of channels for use in conjunction with the primary channel to enable the transmission of high rate data. The present invention provides for dynamic channel assignment for the transmission of high rate data and provides a highly efficient system for the transmission of variable rate data.
II. Description of the Related Art
The present invention is concerned with multiple users sharing a communications resource such as in a cellular CDMA system. The use of code division multiple access (CDMA) modulation techniques is one of several techniques for facilitating communications in which a large number of system users are present. Other multiple access communication techniques, such as time division multiple access (TDMA), frequency division multiple access (FDMA) and AM modulation schemes such as amplitude companded single sideband (ACSSB) are known in the art. However, the spread spectrum modulation technique of CDMA has significant advantages over these other modulation techniques for multiple access communication systems. The use of CDMA techniques in a multiple access communication system is disclosed in U.S. Patent No. 4,901,307, entitled "SPREAD SPECTRUM MULTIPLE ACCESS COMMUNICATION SYSTEM USING SATELLITE OR TERRESTRIAL REPEATERS", assigned to the assignee of the present invention and incorporated by reference herein. The use of CDMA techniques in a multiple access communication system is further disclosed in U.S. Patent No. 5,103,459, entitled "SYSTEM AND METHOD FOR GENERATING SIGNAL WAVEFORMS IN A CDMA CELLULAR TELEPHONE SYSTEM", assigned to the assignee of the present invention and incorporated by reference herein. CDMA by its inherent nature of being a wideband signal offers a form of frequency diversity by spreading the signal energy over a wide bandwidth. Therefore, frequency selective fading affects only a small part of the CDMA signal bandwidth. Path diversity is obtained by exploiting the multipath environment through spread spectrum processing by allowing a signal arriving with different propagation delays to be received and processed separately. Furthermore, space or path diversity is obtained by providing multiple signal paths through simultaneous links between a mobile user and two or more base stations. Examples of the utilization of path diversity are illustrated in U.S. Patent No. 5,109,390 entitled "DIVERSITY RECEIVER IN A CDMA CELLULAR TELEPHONE SYSTEM", and U.S. Patent No. 5,101,501 entitled "SOFT HANDOFF IN A CDMA CELLULAR TELEPHONE SYSTEM", both assigned to the assignee of the present invention and incorporated by reference herein. An additional technique that may be used to increase the efficiency of the allocation of the communication resource is to allow the users of the resource to provide data at varying rates thereby using only the minimum amount of the communication resource to meet their service needs. An example of variable rate data source is a variable rate vocoder which is detailed in U.S. Patent No. 5,414,796, entitled "VARIABLE RATE VOCODER," assigned to the assignee of the present invention and incorporated herein by reference. Since speech inherently contains periods of silence, i.e. pauses, the amount of data required to represent these periods can be reduced. Variable rate vocoding most effectively exploits this fact by reducing the data rate for these silent periods.
A variable rate speech encoder provides speech data at full rate when the talker is actively speaking, thus using the full capacity of the transmission frames. When a variable rate speech coder is providing speech data at a less than maximum rate, there is excess capacity in the transmission frames. A method for transmitting additional data in transmission frames of a fixed size, wherein the data source is providing data at a variable rate is described in detail in U.S. Patent No. 5,504,773, entitled "METHOD AND APPARATUS FOR THE FORMATTING OF DATA FOR TRANSMISSION", assigned to the assignee of the present invention and incorporated by reference herein. In the above mentioned patent application a method and apparatus is disclosed for combining data of differing types from different sources in a data packet for transmission. SUMMARY OF THE INVENTION
A communications resource is typically divided into communications channels. The present invention is described in the context of a CDMA communication system, wherein each channel is provided by spreading the data by a different spreading sequence. In the exemplary embodiment, the spreading sequences used are orthogonal Walsh sequences.
In the present invention, each user is provided with a dedicated channel, referred to herein as the primary channel. In addition, each user is provided with selective access to a pool of common channels, referred to herein as additional channels which can be shared by all users of the communication system.
When the rate of a user's transmission exceeds the capacity of the primary channel, the communication system determines whether sufficient additional channels are available for the transmission of the high rate data. If sufficient additional channels are available, they are assigned to the user for transmission of the high rate data.
In the present invention, after determining that sufficient additional channels are available but prior to the onset of the high rate transmission, the transmitter sends a message, referred to herein as the first channel assignment message, to the receiver indicating a forthcoming high rate data transmission. In the exemplary embodiment, the channel assignment message identifies the additional channels that will be used to support the high rate data service. In the exemplary embodiment, the first channel assignment message is transmitted two frames in advance of the high rate transmission. By using the first channel assignment message the receiving system need not demodulate all possible channels at all times which greatly reduces power consumption of the mobile station. In an improved embodiment, a secondary channel assignment message containing the same information as the first channel assignment message is provided on the primary channel at the onset of the high rate data communication. This provides a second indication of the high rate data transmission which can be relied upon if the frame carrying the first channel assignment message is not properly received.
In the present invention, the receiving system initializes a set of additional demodulators to demodulate the high rate data in accordance with the information provided in the first channel assignment message. The high rate data is demodulated by the primary channel demodulator and the additional channel demodulators and the demodulated frames are combined and provided to the user.
If a frame erasure occurs, the receiving system demodulates all possible additional channels as though a first channel assignment message had been received in the erased frame. The receiving system then uses the secondary channel assignment message to re-assemble the frame and to initialize the additional demodulators for receiving the next frames.
BRIEF DESCRIPTION OF THE DRAWINGS
The features, objects, and advantages of the present invention will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout and wherein: Figure 1 is a diagram illustrating an exemplary implementation of the present invention in a mobile communication system;
Figure 2 is a block diagram of the transmission system of the present invention; and
Figure 3 is a block diagram of a receiver system of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A multiple access communication resource is divided into channels.
This division is usually called multiplexing, three specific types being: frequency division multiplexing (FDM), time division multiplexing (TDM), and code division multiplexing (CDM). The basic unit of information transmitted and received in a communication system is referred to as a frame.
Referring now to the figures, FIG. 1 illustrates an exemplary implementation of the present invention in a mobile communication system. Mobile station 10 transmits information to and receives information from cell base station 12. Cell base station 12, in turn, transmits information to and receives information from mobile telephone switching office (MTSO) 14. MTSO 14, in turn, transmits information to and receives information from a public switching telephone network (not shown).
In the exemplary embodiment, the signals transmitted by cell base station 12 to mobile station 10 are spread spectrum signals as are the signals transmitted from mobile station 10 to cell base station 12. The generation of spread spectrum communication signals is described in detail in the aforementioned U.S. Patent Nos. 4,901,307 and 5,103,459. The exemplary embodiment of the present invention is described in terms of a method for providing high rate data packets from cell base station 12 to mobile station 10 referred to herein as forward link transmissions. However, the present invention is equally applicable to the reverse link transmission of data from mobile station 10 to cell base station 12.
In the exemplary embodiment, mobile station 10 is assigned a primary channel for communications with base station 12. In the exemplary embodiment, a single channel is provided by a unique Walsh spreading sequence as is described in detail in the aforementioned U.S. Patent Nos. 4,901,307 and 5,103,459. In the present invention, cell base station 12 uses additional channels to provide high rate data transmission to mobile station 10.
As referred to herein, high rate data packets are those which require more capacity than the primary channel for their transmission. In the exemplary embodiment, the data is transmitted in packets. If a packet contains high rate data, its contents are divided into a plurality of frames, each of which can be transmitted on a single channel and recombined at the receiver.
FIG. 2 illustrates a block diagram of the exemplary embodiment of the transmission system of the present invention. Data source 20 provides the packets of data for transmission from cell base station 12 to mobile station 10. Data source 20 is provided for illustrative purposes. It should be noted that bases station 12 is typically relaying information from remote location and data source 20 is simply a convenient way to illustrate a source of the packets of data for transmission. Data source 20 can provide both packets of data less than capacity limits of the primary channel and high rate data requiring the use of the primary channel plus one or more additional channels to carry the packet.
When the data packet for transmission can be transmitted using only the assigned primary cannel, data source 20 provides the packet of data through de-multiplexer (DE-MUX) 22 to primary formatter 24. In the exemplary embodiment, primary formatter 24 generates a set of redundant bits for the packet in accordance with error correction and detection methods that are well known in the art. In the exemplary embodiment, formatter 24 generates a set of cyclic redundancy check (CRC) bits and a set of code tail bits and appends those sets of bits to the outgoing packet, the generation of which is detailed in the aforementioned U.S. Patent No. 5,550,773.
Primary formatter 24 outputs the packet to primary encoder 26 which encodes the packet to provide encoded symbols. In the exemplary embodiment, primary encoder 26 is a rate 1/2 convolutional encoder, the design and implementation of which are well known in the art. In an exemplary embodiment, the convolutional encoder is implemented using a digital shift register. Primary encoder 26 provides the encoded data packet to primary interleaver 28. Primary interleaver 28 reorders the binary digits of the encoded packet in accordance with a predetermined reordering format. In the exemplary embodiment, primary interleaver 28 is a block interleaver. In a block interleaver, the data is written into memory in columns and output in rows. In conjunction with error correcting code, interleaving increases the time diversity of the data, and therefore increases the robustness against bursty channel errors.
The interleaved packet is provided by primary interleaver 28 to primary modulator 30. Primary modulator 30 modulate the frames in order to provide the frame on the assigned primary channel. In the exemplary embodiment modulator 30 is a code division multiple access (CDMA) modulator as described in detail in U.S. Patent Nos. 4,901,307 and 5,103,459. In the exemplary embodiment, each frame is spread by a Walsh sequence (Wn) that is unique to that channel and orthogonal to all other Walsh sequences used by all other channels upon which data is transmitted from base station 12. In the exemplary embodiment, data on the primary channel can be variable rate in accordance with the industry standard TIA/EIA/IS-95- A Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System, whereas data provided on the additional channels is scheduled at a fixed rate. In the exemplary embodiment, the spread frame is then covered using a pseudorandom noise (PN) sequence which provides greater separation in code space and identification for each base station 12. Each channel is distinguished uniquely by its Walsh sequence. There are a limited number of available orthogonal sequences, so the greater the number of users transmitting at high rates the fewer the number of users that can be accommodated by base station 12. Modulator 30 provides the modulated frame to transmitter (TMTR) 36, which frequency upconverts and amplifies the modulated frame, and transmits the signal through antenna 38. When data source 20 prepares to transmit high rate data packet, it provides a request signal (REQ) to cell controller 40 of cell base station 12. Cell controller 40 responds by providing an acknowledgment of the request (ACK). Cell controller 40 selects additional channels which will be used for the transmission of the high rate data. In the exemplary embodiment, the pool of possible additional channels that can be used for the transmission of high rate data is pre-defined so that selection can be performed by a simple masking technique as is well known in the art. In another exemplary embodiment sets of additional channels are predefined and channel assignment messages simply identify one of the predefined sets. In an improved embodiment, the pre-defined sets consist of different number of additional channels. Cell controller 40, generates a channel assignment message, which indicates the additional Walsh channel or channels that will be used to carry the high rate data two frames (40 ms) later and provides that message to primary formatter 24.
The channel assignment message can be provided with its own CRC check bits to provide additional reliability or can be transmitted without the its own check bits using only a minimum number of additional bits. If the present invention is to be used in a time division multiple access communication system, then the channel assignment messages would specify additional time slots where data will be provided to mobile station 10. Similarly if the present invention is applied to a frequency division multiple access communication system, then the channel assignment messages would specify additional frequencies which will be used to provide data to mobile station 10.
In the exemplary embodiment, the channel assignment message is provided as additional signaling data which is combined with the outgoing data on the primary channel. The channel assignment message transmitted in advance of the onset of the high rate data transmissions is referred to herein as the first channel assignment message. A method for combining outgoing traffic data with signaling data is described in detail in the aforementioned U.S. Patent No. 5,550,773. In an alternative embodiment, the first channel assignment message is punctured into the outgoing data frame on the primary channel by methods well known in the art. The frame containing the first channel assignment message is formatted as described above by primary formatter 24 and encoded by primary encoder 26 as described above. The encoded symbols are then provided to primary interleaver 28 which reorders the symbols as described above. In the exemplary embodiment, the channel assignment message, signaling messages (if they exist), control messages (if they exist) and part of the data are all transmitted on the primary channel by primary modulator 30, the additional channels only carry data. In the exemplary embodiment, power control bits if they exist are punctured into the primary channel data to provide closed loop power control of the type described in the aforementioned U.S. Patent 5,109,501. The primary channel can be variable or fixed rate or it can be used as a dedicated control channel. The modulated frame is upconverted and amplified by transmitter 34 and transmitted through antenna 36. In the exemplary embodiment, the first channel assignment message is provided two frames in advance of the onset of high rate data transmissions to provide sufficient time for the receiver (illustrated in FIG. 3) to prepare for its reception. In the exemplary embodiment, during the call set-up, the additional channels are grouped by cell controller 40 and transmitted to mobile station 10. In the exemplary embodiment, this group of additional channels can be updated during the call. Defining the set of possible additional channels in advance allows the channel assignment message to require only a few bits to identify the channels to be used. Instead of sending a signal identifying the additional channels to be used, the base station can send a mask signal that will allow high rate demodulation controller 117 to identify the additional channels.
Because there is a chance that the frame carrying the first channel assignment message may be received in error, the present invention provides the channel assignment information redundantly in a secondary channel assignment message transmitted on the primary channel.
At the onset of high rate data transmissions, data source 20 provides the high rate data packet to de-multiplexer 22. De-multiplexer 22 divides the high rate data packet into two parts. The first part is contained in a frame to be transmitted on the primary channel. The second part is contained in frames to be transmitted on additional channels. The frame to be transmitted on the primary channel is processed as described above.
The data bits for the additional channels are provided to additional formatter 25. Additional formatter 25 generates a set of CRC bits for the incoming data and a set of code tail bits. The formatted data from additional formatter 25 is provided to additional encoder 27 which encodes the data to provide encoded symbols. In the exemplary embodiment, additional encoder 27 is a convolutional encoder.
The encoded symbols are provided to additional interleaver 29, which as described above reorders the encoded symbols in accordance with a predetermined ordering format. In a first embodiment of primary interleaver 28 and additional interleaver 29, the interleavers use the same number of addresses but variable words size to accommodate different sized blocks of data for interleaving. In an alternative embodiment of primary interleaver 28 and additional interleaver 29, the interleavers use a variable number of addresses and a fixed word size to accommodate varying block size. The reordered encoded symbols are provided to de-multiplexer (DE- MUX) 35 which divides the additional frame into frames each of which is carried on an additional channel. Each of the additional frames from de-multiplexer 35 is provided to a different one of additional modulators 32a-32n. In the exemplary embodiment, the modulated additional frames from additional modulators 32a-32n are combined with the modulated frame from primary modulator 30 by transmitter 34 before transmission. Transmitter 34 upconverts and amplifies the combined signal and transmits that signal through antenna 36.
Now referring to FIG. 3, the signal broadcast through antenna 36 of FIG. 2 is received at the by antenna 110 and provided to receiver (RCVR) 112. Receiver 112 downconverts, filters and amplifies the received signal and provides the received signal to demodulation circuit 111.
Demodulation circuit 111 represents one "finger" of a RAKE receiver should such a design be used. In a RAKE receiver implementation, multipath signals received at mobile station 10 with different propagation path delays are demodulated separately and the results of those demodulation operations are then combined in finger combiner 128. The design and implementation of a RAKE receiver is described in detail in aforementioned U.S. Patent No. 5,109,390.
In the exemplary embodiment, primary demodulator 114 and additional demodulators 120a-120n are CDMA demodulators as disclosed in the aforementioned U.S. Patent Nos. 4,901,307 and 5,103,459. In the exemplary embodiment, primary demodulator 114 and additional demodulators 120a-120n are quadrature phase shift keying (QPSK) demodulators.
Primary demodulator 114 despreads the received signal in accordance with the allocated primary channel Walsh sequence and PN code. The de- spread primary frame is provided to finger combiner 128, which combines the primary frame soft decision from finger demodulator 111 with soft decisions from other fingers to provide an improved soft decision. The improved soft decisions are provided to primary de-interleaver 118, which reorders the demodulated soft decisions in accordance with a predetermined re-ordering format. The design and implementation of de-interleavers are well known in the art. In the exemplary embodiment, de-interleavers 118 and 124 either operate using a fixed number of addresses and variable word size or a fixed word size and variable number of addresses to accommodate different sized data packets.
De-interleaver 118 provides the reordered frame to primary decoder 122, which decodes the frame. In the exemplary embodiment, primary decoder 122 and additional decoder 126 are Viterbi decoders, the design and implementation of which are well known in the art. The decoded frame from primary decoder 122 is provided through multiplexer 127 to data sink 130 which could be the user of mobile station 10 or further processing elements.
If the frame containing a first channel assignment message is received without error, then the decoded channel assignment message is provided to high rate data controller 117. High data rate controller can be implemented using a microprocessor programmed to perform the necessary functions. High rate data controller 117 provides the necessary Walsh sequence identification and PN code information to additional demodulators 120a- 120n to demodulate the additional data.
The RF signal is received by antenna 110 and provided to receiver 112. Receiver 112 amplifies and down converts the received signal and provides the received signal to primary demodulator 114 and additional demodulators 120a-120n. The demodulated primary frame from the primary channel is provided to finger combiner 128 to provide improved demodulated soft decisions as described above. The improved soft decisions are provided to primary de-interleaver 118 which re-orders the soft decisions as described above. The reordered frame is provided to primary decoder 122 which decodes the de-interleaved frame and provides the decoded frame to multiplexer (MUX) 127.
The received signal is also provided to additional demodulators 120a- 120n which demodulate the signals in accordance with the channel information provided in the first channel assignment message. The demodulated frames of data from additional demodulators 120a-120n are provided to finger combiner 128 to generate improved soft decisions for each of the additional frames. The improved soft decisions of the demodulated frames are provides to multiplexer (MUX) 123 which re¬ assembles the packet containing the additional data. In the exemplary embodiment, multiplexer 123 operates in accordance with a signal from high rate demodulation controller 117 which indicates the additional demodulators that are being used and how to re-assemble the packet containing additional data. The re-assembled packet of additional data is provided to additional de-interleaver 124 which re-orders the soft decisions in accordance with a predetermined de-interleaving format. The reordered soft decisions are provided to additional decoder 126. Although illustrated as two separate blocks, primary decoder 122 and additional decoder 126 can be implemented using the same hardware, such as a microprocessor programmed to perform the specified function or an application specific integrated circuit (ASIC) designed to perform the specified function. Additional decoder 126 decodes the additional packet of data and provides the decoded bits to multiplexer 127. Multiplexer (MUX) 127 combines the decoded data transmitted on the primary channel with the decoded data transmitted on the additional channels. The reassembled data packet is provided to data sink 103.
If a frame erasure occurs and the content of the first channel assignment message is unknown, the receiver system will operate on the basis of a worst case scenario. The receiver will demodulate the maximum set of additional channels possible and it will demodulate the last such set used. It will then decide which frames from additional channels are to be used as valid data once the secondary channel assignment message for the current data packet is properly decoded. If both frames containing the first and secondary channel assignment messages are received in error, then the corresponding received data will be discarded and an erasure is declared.
The present invention is equally applicable to variable rate data transmission and fixed rate transmission. For fixed rate transmission, the channel assignment message data will typically remain constant throughout the service. However should the need for additional channels arise for signaling or other data traffic, the channel assignment messages will be allowed to vary to indicate the additional channel to be used for the transmission of that data. For variable rate transmissions, the scheduling is done so that only the necessary number of additional channels for the current data packet size are assigned. The number of additional channels to be assigned depends on the amount of data to be sent. This could be done on a frame by frame basis. The previous description of the preferred embodiments is provided to enable any person skilled in the art to make or use the present invention. The various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
WE CLAIM:

Claims

1. An apparatus for transmitting high rate packet data comprising: cell controller means for generating a first channel assignment message indicating at least one additional channel which will be used to support the transmission of said high rate data packet; and transmission means for transmitting said first channel assignment message and for transmitting said high rate data packet on a primary channel and said at least one additional channel.
2. The apparatus of Claim 1 wherein said first channel assignment message is transmitted in advance of said high rate data packet.
3. The apparatus of Claim 2 wherein said first channel assignment message is transmitted two frames in advance of said high rate data packet.
4. The apparatus of Claim 1 wherein said first channel assignment message is transmitted in advance of said high rate data and wherein said transmission means if further for transmitting a secondary channel assignment message in a first frame of said high rate data packet.
5. A system for receiving high rate data packet comprising: first receiving means for demodulating a primary frame of data and for providing from said primary frame of data a channel assignment message; and second receiving means for demodulating at least on additional channel of data in accordance with said channel assignment message.
PCT/US1997/009287 1996-05-31 1997-05-28 Method and apparatus for high rate data transmission in a spread spectrum communication system WO1997046044A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP97928730A EP0903051B1 (en) 1996-05-31 1997-05-28 Method and apparatus for high rate data transmission in a spread spectrum communication system
DE69734652T DE69734652T2 (en) 1996-05-31 1997-05-28 METHOD AND DEVICE FOR HIGH-SPEED DATA TRANSMISSION IN A SPREADING SPECTRUM TRANSMISSION SYSTEM
JP54298497A JP3679132B2 (en) 1996-05-31 1997-05-28 Method and apparatus for high rate data transmission in a spread spectrum communication system
IL12724397A IL127243A (en) 1996-05-31 1997-05-28 Method and apparatus for high rate data transmission in a spread spectrum communication system
BRPI9709482-0A BR9709482B1 (en) 1996-05-31 1997-05-28 equipment for transmitting high rate packet data.
AT97928730T ATE310365T1 (en) 1996-05-31 1997-05-28 METHOD AND DEVICE FOR HIGH-SPEED DATA TRANSMISSION IN A SPREAD SPECTRUM TRANSMISSION SYSTEM
AU32914/97A AU716886B2 (en) 1996-05-31 1997-05-28 Spread spectrum communication system which defines channel groups comprising selected channels that are additional to a primary channel and transmits group messages during call set up
FI982579A FI982579A (en) 1996-05-31 1998-11-27 A method and apparatus for high speed data transmission in a spread spectrum communication system
HK99104096A HK1019390A1 (en) 1996-05-31 1999-09-21 Method and apparatus for high rate data transmission in a spread spectrum communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/656,649 US5859840A (en) 1996-05-31 1996-05-31 Spread spectrum communication system which defines channel groups comprising selected channels that are additional to a primary channel and transmits group messages during call set up
US656,649 1996-05-31

Publications (1)

Publication Number Publication Date
WO1997046044A1 true WO1997046044A1 (en) 1997-12-04

Family

ID=24633964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/009287 WO1997046044A1 (en) 1996-05-31 1997-05-28 Method and apparatus for high rate data transmission in a spread spectrum communication system

Country Status (13)

Country Link
US (1) US5859840A (en)
EP (1) EP0903051B1 (en)
JP (1) JP3679132B2 (en)
CN (1) CN1112829C (en)
AT (1) ATE310365T1 (en)
AU (1) AU716886B2 (en)
BR (1) BR9709482B1 (en)
DE (1) DE69734652T2 (en)
FI (1) FI982579A (en)
HK (1) HK1019390A1 (en)
IL (1) IL127243A (en)
RU (1) RU2189696C2 (en)
WO (1) WO1997046044A1 (en)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063713A1 (en) * 1998-06-01 1999-12-09 Tantivy Communications, Inc. Dynamic bandwidth allocation in cdma system
WO2000035225A1 (en) * 1998-12-09 2000-06-15 Siemens Aktiengesellschaft Method for data transmission in a radio communications system
US6081536A (en) * 1997-06-20 2000-06-27 Tantivy Communications, Inc. Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link
WO2000054438A1 (en) * 1999-03-08 2000-09-14 Qualcomm Incorporated Method of rate allocation in a data communications network
US6236647B1 (en) 1998-02-24 2001-05-22 Tantivy Communications, Inc. Dynamic frame size adjustment and selective reject on a multi-link channel to improve effective throughput and bit error rate
WO2002001761A1 (en) * 2000-06-24 2002-01-03 Samsung Electronics Co., Ltd Method and apparatus for transmitting data rate control information in mobile telecommunication system for packet data transmission
US6542481B2 (en) 1998-06-01 2003-04-01 Tantivy Communications, Inc. Dynamic bandwidth allocation for multiple access communication using session queues
EP1476963A2 (en) * 2002-01-22 2004-11-17 IPR Licensing, Inc. Overhead reduction in a communications system
KR100525387B1 (en) * 2000-12-20 2005-11-02 엘지전자 주식회사 Method for transmitting a large size of multicast message
US6965778B1 (en) 1999-04-08 2005-11-15 Ipr Licensing, Inc. Maintenance of channel usage in a wireless communication system
KR100547793B1 (en) * 2001-12-29 2006-02-01 삼성전자주식회사 Method for controlling reverse data transmission in wireless telecommunication system
KR100547851B1 (en) * 1999-12-29 2006-02-01 삼성전자주식회사 Data transmitting method in cdma system
KR100553067B1 (en) * 2000-07-01 2006-02-15 엘지전자 주식회사 Method for controlling DRC in Data Transport HDR system and data slot structure for the controlling DRC
CN1326376C (en) * 2002-10-10 2007-07-11 Lg电子株式会社 System and method for supplying short message in high-speed packet data system
WO2008008870A2 (en) * 2006-07-14 2008-01-17 Qualcomm Incorporated Methods and apparatus related to assignment in a wireless communications system
KR100853948B1 (en) 2000-11-03 2008-08-25 루센트 테크놀러지스 인크 Apparatus and method for use in the multicast of traffic data in wireless multiple access communications systems
US7680475B2 (en) 2004-06-09 2010-03-16 Qualcomm Incorporated Dynamic ASBR scheduler
US7881327B2 (en) 2003-06-23 2011-02-01 Qualcomm Incorporated Code channel management in a wireless communications system
US8023474B2 (en) 2003-10-02 2011-09-20 Qualcomm Incorporated Systems and methods for communicating control data using multiple slot formats
US8032145B2 (en) 2004-07-23 2011-10-04 Qualcomm Incorporated Restrictive reuse set management algorithm for equal grade of service on FL transmission
US8072942B2 (en) 2003-11-26 2011-12-06 Qualcomm Incorporated Code channel management in a wireless communications system
US8225186B2 (en) 2006-07-14 2012-07-17 Qualcomm Incorporated Ecoding and decoding methods and apparatus for use in a wireless communication system
US8325826B2 (en) 2005-03-09 2012-12-04 Qualcomm Incorporated Methods and apparatus for transmitting signals facilitating antenna control
US8675509B2 (en) 2004-12-22 2014-03-18 Qualcomm Incorporated Feedback to support restrictive reuse
US8699505B2 (en) 2002-05-31 2014-04-15 Qualcomm Incorporated Dynamic channelization code allocation
USRE45367E1 (en) 1997-06-20 2015-02-10 Intel Corporation Protocol conversion and bandwidth reduction technique providing multiple NB+D ISDN basic rate interface links over a wireless code division multiple access communication system
US9014118B2 (en) 2001-06-13 2015-04-21 Intel Corporation Signaling for wireless communications
US9042400B2 (en) 1997-12-17 2015-05-26 Intel Corporation Multi-detection of heartbeat to reduce error probability
US9225395B2 (en) 2000-12-01 2015-12-29 Intel Corporation Antenna control system and method
US9247510B2 (en) 2001-02-01 2016-01-26 Intel Corporation Use of correlation combination to achieve channel detection
US9301274B2 (en) 2000-02-07 2016-03-29 Intel Corporation Minimal maintenance link to support synchronization
US9408253B2 (en) 1999-09-21 2016-08-02 Ipr Licensing, Inc. Subscriber unit for managing dual wireless communication links
US9525923B2 (en) 1997-12-17 2016-12-20 Intel Corporation Multi-detection of heartbeat to reduce error probability
US9585023B2 (en) 2003-10-30 2017-02-28 Qualcomm Incorporated Layered reuse for a wireless communication system

Families Citing this family (82)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000568A1 (en) * 1995-06-14 1997-01-03 International Business Machines Corporation Packet data transmission in code-division multiple access communication systems
JPH09191301A (en) * 1996-01-10 1997-07-22 Canon Inc Spread spectrum communication equipment
JP3286189B2 (en) * 1996-11-14 2002-05-27 松下電器産業株式会社 Receiver using algorithm diversity
US6335922B1 (en) * 1997-02-11 2002-01-01 Qualcomm Incorporated Method and apparatus for forward link rate scheduling
US7751370B2 (en) 2001-07-13 2010-07-06 Qualcomm Incorporated Method and apparatus for forward link rate scheduling
FI112894B (en) * 1997-04-10 2004-01-30 Nokia Corp Procedure for reducing the likelihood of frame errors in data transfer in the form of data frames
US6075792A (en) 1997-06-16 2000-06-13 Interdigital Technology Corporation CDMA communication system which selectively allocates bandwidth upon demand
US6064678A (en) * 1997-11-07 2000-05-16 Qualcomm Incorporated Method for assigning optimal packet lengths in a variable rate communication system
US20040160910A1 (en) * 1997-12-17 2004-08-19 Tantivy Communications, Inc. Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link
US6222832B1 (en) * 1998-06-01 2001-04-24 Tantivy Communications, Inc. Fast Acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system
US7936728B2 (en) * 1997-12-17 2011-05-03 Tantivy Communications, Inc. System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
US7079523B2 (en) * 2000-02-07 2006-07-18 Ipr Licensing, Inc. Maintenance link using active/standby request channels
US7496072B2 (en) * 1997-12-17 2009-02-24 Interdigital Technology Corporation System and method for controlling signal strength over a reverse link of a CDMA wireless communication system
US6393008B1 (en) * 1997-12-23 2002-05-21 Nokia Movile Phones Ltd. Control structures for contention-based packet data services in wideband CDMA
KR100304924B1 (en) * 1997-12-30 2001-11-22 서평원 Inter-frequency handoff control method in cdma cellular system
JP3403740B2 (en) * 1998-03-26 2003-05-06 サムスン エレクトロニクス カンパニー リミテッド Apparatus and method for power control of orthogonal channel and quasi-orthogonal channel in code division multiple access communication system
KR100444643B1 (en) 1998-03-26 2004-08-18 미쓰비시덴키 가부시키가이샤 Spread spectrum communication device and spread spectrum communication method
US5956641A (en) * 1998-03-30 1999-09-21 Motorola, Inc. System and method for facilitating a handoff of at least one mobile unit in a telecommunication system
JP3058270B2 (en) * 1998-04-22 2000-07-04 日本電気株式会社 CDMA communication method, spread spectrum communication system, base station, and terminal device
US6353626B1 (en) * 1998-05-04 2002-03-05 Nokia Mobile Phones Limited Methods and apparatus for providing non-uniform de-multiplexing in a multi-carrier wide band CDMA system
US7773566B2 (en) * 1998-06-01 2010-08-10 Tantivy Communications, Inc. System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
US7221664B2 (en) * 1998-06-01 2007-05-22 Interdigital Technology Corporation Transmittal of heartbeat signal at a lower level than heartbeat request
US8134980B2 (en) * 1998-06-01 2012-03-13 Ipr Licensing, Inc. Transmittal of heartbeat signal at a lower level than heartbeat request
BR9802554A (en) * 1998-07-22 2000-03-21 Samsung Electronics Co Ltd transient of a portable terminal between base stations using different frequencies.
KR100373965B1 (en) * 1998-08-17 2003-02-26 휴우즈 일렉트로닉스 코오포레이션 Turbo code interleaver with near optimal performance
EP1033004A1 (en) * 1998-09-18 2000-09-06 Hughes Electronics Corporation Method and constructions for space-time codes for psk constellations for spatial diversity in multiple-element antenna systems
JP3679933B2 (en) * 1998-09-21 2005-08-03 株式会社東芝 Communication terminal device and communication speed switching method thereof
US6693953B2 (en) * 1998-09-30 2004-02-17 Skyworks Solutions, Inc. Adaptive wireless communication receiver
RU2145152C1 (en) * 1998-10-08 2000-01-27 Гармонов Александр Васильевич Method for orthogonal distributed transmission- reception of signal in cellular communication network using code channel division
US6128330A (en) 1998-11-24 2000-10-03 Linex Technology, Inc. Efficient shadow reduction antenna system for spread spectrum
US6504827B1 (en) * 1998-12-18 2003-01-07 Lucent Technologies Inc. Discontinuous transmission on high speed data channels
US6614776B1 (en) 1999-04-28 2003-09-02 Tantivy Communications, Inc. Forward error correction scheme for high rate data exchange in a wireless system
KR100567283B1 (en) * 1999-07-10 2006-04-05 유티스타콤코리아 유한회사 Method for dynamic channel assignment in mobile communication system
KR100585832B1 (en) * 1999-09-30 2006-06-01 에스케이 텔레콤주식회사 Apparatus and method for expanding channels in CDMA system
US8516146B1 (en) 1999-11-24 2013-08-20 Robert C. Yen Method and system for reduction of delay and bandwidth requirements in internet data transfer
US9538386B2 (en) 1999-11-24 2017-01-03 Robert C. Yen Wireless internet access with enhanced bandwidth capabilities
US8463255B2 (en) * 1999-12-20 2013-06-11 Ipr Licensing, Inc. Method and apparatus for a spectrally compliant cellular communication system
KR100365624B1 (en) * 2000-01-03 2002-12-26 삼성전자 주식회사 Device and method for designating frame offset of supplemental channel in cdma communication system
KR100606064B1 (en) * 2000-01-15 2006-07-26 삼성전자주식회사 Apparatus and method for assignmenting supplemental channel in mobile communication system
US6934275B1 (en) * 2000-04-17 2005-08-23 Motorola, Inc. Apparatus and method for providing separate forward dedicated and shared control channels in a communications system
CA2310188A1 (en) * 2000-05-30 2001-11-30 Mark J. Frazer Communication structure with channels configured responsive to reception quality
GB2364206B (en) * 2000-06-30 2004-12-15 Motorola Inc Transmission procedures
US6529527B1 (en) 2000-07-07 2003-03-04 Qualcomm, Inc. Method and apparatus for carrying packetized voice and data in wireless communication networks
JP3730842B2 (en) * 2000-08-02 2006-01-05 日本電気株式会社 CDMA receiver and method thereof
US6959033B1 (en) * 2000-08-25 2005-10-25 Texas Instruments Incorporated System and method for assigning combiner channels in spread spectrum communications
US6647053B1 (en) 2000-08-31 2003-11-11 Ricochet Networks, Inc. Method and system for channel masking in a communication network
WO2002028021A2 (en) * 2000-09-27 2002-04-04 Yen Robert C Wireless internet access with enhanced bandwidth capabilities
WO2002041530A1 (en) * 2000-11-16 2002-05-23 Sony Corporation Information processing apparatus and communication apparatus
US7346918B2 (en) * 2000-12-27 2008-03-18 Z-Band, Inc. Intelligent device system and method for distribution of digital signals on a wideband signal distribution system
US6954448B2 (en) 2001-02-01 2005-10-11 Ipr Licensing, Inc. Alternate channel for carrying selected message types
US7158504B2 (en) * 2001-05-21 2007-01-02 Lucent Technologies, Inc. Multiple mode data communication system and method and forward and/or reverse link control channel structure
KR100471616B1 (en) * 2001-06-08 2005-03-08 유티스타콤코리아 유한회사 Method and apparatus for providing high-speed packet data service via supplemental channel in is-95c cdma system
US6999441B2 (en) * 2001-06-27 2006-02-14 Ricochet Networks, Inc. Method and apparatus for contention management in a radio-based packet network
US7003313B2 (en) * 2001-06-27 2006-02-21 Ricochet Networks, Inc. Method for enhancing mobility in a wireless mesh network
FR2826806B1 (en) * 2001-07-02 2004-04-23 Nortel Networks Ltd SIGNAL BLOCK TRANSMISSION METHOD, TRANSMITTING STATION AND DATA SOURCE FOR IMPLEMENTING THE METHOD
WO2003024133A1 (en) * 2001-09-07 2003-03-20 Nokia Corporation Device and method for qos based cell capacity dimensioning
KR100461542B1 (en) * 2002-12-26 2004-12-17 한국전자통신연구원 Apparatus and Method for Digital Broadcasting Service using Multiple Frequency Bands
US8391249B2 (en) 2003-02-18 2013-03-05 Qualcomm Incorporated Code division multiplexing commands on a code division multiplexed channel
US8023950B2 (en) 2003-02-18 2011-09-20 Qualcomm Incorporated Systems and methods for using selectable frame durations in a wireless communication system
US7155236B2 (en) 2003-02-18 2006-12-26 Qualcomm Incorporated Scheduled and autonomous transmission and acknowledgement
US8150407B2 (en) 2003-02-18 2012-04-03 Qualcomm Incorporated System and method for scheduling transmissions in a wireless communication system
US20040160922A1 (en) 2003-02-18 2004-08-19 Sanjiv Nanda Method and apparatus for controlling data rate of a reverse link in a communication system
US8081598B2 (en) 2003-02-18 2011-12-20 Qualcomm Incorporated Outer-loop power control for wireless communication systems
US7660282B2 (en) 2003-02-18 2010-02-09 Qualcomm Incorporated Congestion control in a wireless data network
US8705588B2 (en) 2003-03-06 2014-04-22 Qualcomm Incorporated Systems and methods for using code space in spread-spectrum communications
US7215930B2 (en) 2003-03-06 2007-05-08 Qualcomm, Incorporated Method and apparatus for providing uplink signal-to-noise ratio (SNR) estimation in a wireless communication
US8477592B2 (en) 2003-05-14 2013-07-02 Qualcomm Incorporated Interference and noise estimation in an OFDM system
US8489949B2 (en) 2003-08-05 2013-07-16 Qualcomm Incorporated Combining grant, acknowledgement, and rate control commands
UA83256C2 (en) * 2003-10-02 2008-06-25 Квелкомм Инкорпорэйтед Systems and methods for communication control data for multiple data channels using a single control channel (variants)
US7283492B2 (en) * 2003-10-02 2007-10-16 Qualcomm Incorporated Systems and methods for multiplexing control information onto a physical data channel
CN100428765C (en) * 2003-12-20 2008-10-22 海信集团有限公司 Method for mobile terminal dialing Ip telephone to appeal channel
UA92462C2 (en) * 2004-07-15 2010-11-10 Кьюбик Корпорейшн Method for prediction of position of aiming point in simulated medium (variants), system and computer system for its realization and method for improved tracking of aiming points to targets in simulated medium
KR100724949B1 (en) 2005-05-03 2007-06-04 삼성전자주식회사 Method and Apparatus for multiplexing data and control information in wireless communication systems based on frequency division multiple access
US20070047489A1 (en) * 2005-08-26 2007-03-01 Bachl Rainer W Handoffs in wireless communications network incorporating voice over IP using shared supplemental spreading codes
US8920343B2 (en) 2006-03-23 2014-12-30 Michael Edward Sabatino Apparatus for acquiring and processing of physiological auditory signals
US7720485B2 (en) * 2006-07-14 2010-05-18 Qualcomm Incorporated Methods and apparatus related to assignment in a wireless communications system
RU2443079C2 (en) * 2007-08-24 2012-02-20 Алькатель Люсент Method for scheduling resource, network element and user equipment
EP2073419B1 (en) 2007-12-20 2011-10-26 Panasonic Corporation Control channel signaling using a common signaling field for transport format and redundancy version
RU2445739C1 (en) * 2008-01-04 2012-03-20 Нокиа Сименс Нетуоркс Ой Channel allocation when using measurement gaps with h-arq protocol
JP6058662B2 (en) * 2011-07-28 2017-01-11 サムスン エレクトロニクス カンパニー リミテッド Beam forming apparatus and method in wireless communication system
TWI568306B (en) * 2015-10-15 2017-01-21 國立交通大學 Device pairing connection method
US10841039B2 (en) * 2018-10-30 2020-11-17 Infineon Technologies Ag System and method for transferring data and a data check field

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587980A2 (en) * 1992-09-18 1994-03-23 Roke Manor Research Limited Improvements in or relating to cellular mobile radio systems
US5299198A (en) * 1990-12-06 1994-03-29 Hughes Aircraft Company Method and apparatus for exploitation of voice inactivity to increase the capacity of a time division multiple access radio communications system
WO1996008934A2 (en) * 1994-09-16 1996-03-21 Ionica International Limited Transmission of digital data messages in digital telephony

Family Cites Families (76)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310631A (en) * 1963-06-03 1967-03-21 Itt Communication system for the selective transmission of speech and data
US3715508A (en) * 1967-09-15 1973-02-06 Ibm Switching circuits employing orthogonal and quasi-orthogonal pseudo-random code sequences
US4052565A (en) * 1975-05-28 1977-10-04 Martin Marietta Corporation Walsh function signal scrambler
US4135059A (en) * 1977-07-07 1979-01-16 Satellite Business Systems Multiple channel per burst tdma multiple transponder network
GB2022365A (en) * 1978-06-02 1979-12-12 Texas Instruments Inc Communications network for data and voice
US4220821A (en) * 1978-06-16 1980-09-02 Communications Satellite Corporation Off-hook initiated demand assignment communications
US4291409A (en) * 1978-06-20 1981-09-22 The Mitre Corporation Spread spectrum communications method and apparatus
US4256925A (en) * 1978-12-12 1981-03-17 Satellite Business Systems Capacity reallocation method and apparatus for a TDMA satellite communication network with demand assignment of channels
US4301530A (en) * 1978-12-18 1981-11-17 The United States Of America As Represented By The Secretary Of The Army Orthogonal spread spectrum time division multiple accessing mobile subscriber access system
FR2454233B1 (en) * 1979-04-11 1986-01-24 Materiel Telephonique STOCHASTIC DEMODULATOR FOR PHASE MODULATED SIGNALS, OPERATING IN TIME SHARING ON MULTIPLE CHANNELS
US4445213A (en) * 1979-07-31 1984-04-24 Bell Telephone Laboratories, Incorporated Communication line interface for controlling data information having differing transmission characteristics
US4291406A (en) * 1979-08-06 1981-09-22 International Business Machines Corporation Error correction on burst channels by sequential decoding
US4298979A (en) * 1979-09-27 1981-11-03 Communications Satellite Corporation Decoding TIM bus structure
US4322845A (en) * 1979-09-28 1982-03-30 Ibm Corporation Demand assignment technique for TDMA satellite communication network
US4369434A (en) * 1979-12-20 1983-01-18 Gretag Aktiengesellschaft Enciphering/deciphering system
US4319353A (en) * 1980-02-29 1982-03-09 Ibm Corporation Priority threaded message burst mechanism for TDMA communication
US4339818A (en) * 1980-04-30 1982-07-13 Broadcom, Incorporated Digital multiplexer with increased channel capacity
US4477900A (en) * 1980-04-30 1984-10-16 Broadcom, Incorporated Successive frame digital multiplexer with increased channel capacity
FR2488469A1 (en) * 1980-08-06 1982-02-12 Thomson Csf Mat Tel METHOD FOR ESTABLISHING SINGLE BAND RADIO-TELEPHONE CONVERSATIONS THROUGH A SATELLITE
US4730340A (en) * 1980-10-31 1988-03-08 Harris Corp. Programmable time invariant coherent spread symbol correlator
US4383315A (en) * 1981-07-20 1983-05-10 Bell Telephone Laboratories, Incorporated Idle time slot seizure and transmission facilities for loop communication system
US4494232A (en) * 1981-12-04 1985-01-15 Racal-Milgo, Inc. Statistical multiplexer with dynamic bandwidth allocation for asynchronous and synchronous channels
US4455649A (en) * 1982-01-15 1984-06-19 International Business Machines Corporation Method and apparatus for efficient statistical multiplexing of voice and data signals
US4472815A (en) * 1982-09-27 1984-09-18 The United States Of America As Represented By The Secretary Of The Army Pulse interference cancelling system for spread spectrum signals
US4460992A (en) * 1982-11-04 1984-07-17 The United States Of America As Represented By The Secretary Of The Army Orthogonal CDMA system utilizing direct sequence pseudo noise codes
US4726014A (en) * 1983-01-11 1988-02-16 U.S. Holding Company, Inc. Cellular mobile radio service telephone system
US4562572A (en) * 1983-01-11 1985-12-31 International Telephone And Telegraph Corporation Cellular mobile radio service telephone system
US4547880A (en) * 1983-05-13 1985-10-15 Able Computer Communication control apparatus for digital devices
US4491947A (en) * 1983-05-31 1985-01-01 At&T Bell Laboratories Technique for dynamic scheduling of integrated circuit- and packet-switching in a multi-beam SS/TDMA system
US4688035A (en) * 1983-11-28 1987-08-18 International Business Machines Corp. End user data stream syntax
US4587652A (en) * 1984-06-21 1986-05-06 Itt Corporation Data control for telephone system
US4594476A (en) * 1984-08-31 1986-06-10 Freeman Michael J Broadcast interactive telephone system
US4635221A (en) * 1985-01-18 1987-01-06 Allied Corporation Frequency multiplexed convolver communication system
JPS6291027A (en) * 1985-10-17 1987-04-25 Kokusai Denshin Denwa Co Ltd <Kdd> Demmand assignment communication system
US4700341A (en) * 1985-10-30 1987-10-13 Racal Data Communications Inc. Stochastic time division multiplexing
DE3689979T2 (en) * 1986-03-25 1995-01-26 Motorola Inc METHOD AND DEVICE FOR CONTROLLING A TIME MULTIPLEX COMMUNICATION DEVICE.
GB8618424D0 (en) * 1986-07-29 1986-09-03 Leslie I M Data rate channel for digital network
US4901307A (en) * 1986-10-17 1990-02-13 Qualcomm, Inc. Spread spectrum multiple access communication system using satellite or terrestrial repeaters
FI80227C (en) * 1986-11-26 1990-05-10 Kone Oy ANORDING FOR MATERIAL AV TRAED I EN BARKNINGSTRUMMA.
NL8700930A (en) * 1987-04-17 1988-11-16 Hollandse Signaalapparaten Bv SYSTEM OF ORTHOGONALLY OPERATING CODE GENERATORS, RADIOS EQUIPPED WITH A CODE GENERATOR AND CODE GENERATORS OF SUCH A SYSTEM.
FR2617657A1 (en) * 1987-07-03 1989-01-06 Trt Telecom Radio Electr SYSTEM FOR TRANSMITTING SERIES OF DIGITAL SAMPLES CODED BY BINARY WORDS WITH VARIABLE LENGTHS
US4970648A (en) * 1987-08-12 1990-11-13 Fairchild Space And Defense Corporation High performance flight recorder
JPH0817369B2 (en) * 1987-08-17 1996-02-21 株式会社日立製作所 Multiplex distribution device
CA1299706C (en) * 1987-08-27 1992-04-28 Yasutaka Sasaki Concentrator system capable of completing emergency calls under congested traffic
DE3881170T2 (en) * 1987-11-30 1993-12-09 Nec Corp Frame distance fault determination for a TDMA communication system with channel allocation as required.
FR2629931B1 (en) * 1988-04-08 1991-01-25 Lmt Radio Professionelle ASYNCHRONOUS DIGITAL CORRELATOR AND DEMODULATORS COMPRISING SUCH A CORRELATOR
JPH0234059A (en) * 1988-07-25 1990-02-05 Mitsubishi Electric Corp Processing system for node equipment
US5003534A (en) * 1988-08-26 1991-03-26 Scientific Atlanta Link utilization control mechanism for demand assignment satellite communications network
JPH06103873B2 (en) * 1988-09-01 1994-12-14 三菱電機株式会社 Orthogonal sequence generation method
US5179549A (en) * 1988-11-10 1993-01-12 Alcatel N.V. Statistical measurement equipment and telecommunication system using same
CA2046274A1 (en) * 1989-03-03 1990-09-07 Krister Gunmar Method for planning radio cells
JP2603717B2 (en) * 1989-03-09 1997-04-23 三菱電機株式会社 Cyclic data transmission method
US5107377A (en) * 1989-04-10 1992-04-21 Ballard Synergy Corporation Method and apparatus for digital storage and retrieval of data
US5172375A (en) * 1989-06-22 1992-12-15 Nec Corporation Multiple access satellite communication system for mini-earth station networks
GB2236454A (en) * 1989-09-01 1991-04-03 Philips Electronic Associated Communications system for radio telephones
JP2733110B2 (en) * 1989-09-19 1998-03-30 日本電信電話株式会社 Wireless signal transmission method
US4965796A (en) * 1989-09-29 1990-10-23 At&T Bell Laboratories Microprocessor-based substrate multiplexer/demultiplexer
IL95920A0 (en) * 1989-10-24 1991-07-18 Motorola Inc Distributed synchronization method for a wireless fast packet communication system
US5101501A (en) * 1989-11-07 1992-03-31 Qualcomm Incorporated Method and system for providing a soft handoff in communications in a cdma cellular telephone system
JP2540968B2 (en) * 1990-02-27 1996-10-09 日本電気株式会社 Multidirectional communication system
US5103459B1 (en) * 1990-06-25 1999-07-06 Qualcomm Inc System and method for generating signal waveforms in a cdma cellular telephone system
US5115429A (en) * 1990-08-02 1992-05-19 Codex Corporation Dynamic encoding rate control minimizes traffic congestion in a packet network
US5168575A (en) * 1990-09-28 1992-12-01 Motorola, Inc. Demand driven wide-area radio system resource assignment method and apparatus
US5121383A (en) * 1990-11-16 1992-06-09 Bell Communications Research, Inc. Duration limited statistical multiplexing in packet networks
FR2670639A1 (en) * 1990-12-14 1992-06-19 Trt Telecom Radio Electr DEVICE FOR TRANSMITTING DIFFERENT CHANNELS AT A TIME MULTIPLEX WITH VARIOUS BIT RATES.
US5400328A (en) * 1991-05-28 1995-03-21 British Technology Group Ltd. Variable data rate channels for digital networks
FR2678457A1 (en) * 1991-06-28 1992-12-31 Trt Telecom Radio Electr Multiplexing system for subchannels with various levels of priority
US5195090A (en) * 1991-07-09 1993-03-16 At&T Bell Laboratories Wireless access telephone-to-telephone network interface architecture
US5231649A (en) * 1991-08-08 1993-07-27 Ascend Communications, Inc. Method and apparatus for dynamic bandwidth allocation in a digital communication session
JP3226945B2 (en) * 1991-10-02 2001-11-12 キヤノン株式会社 Multimedia communication equipment
JP2554219B2 (en) * 1991-11-26 1996-11-13 日本電信電話株式会社 Digital signal superposition transmission method
US5216503A (en) * 1991-12-24 1993-06-01 General Instrument Corporation Statistical multiplexer for a multichannel image compression system
US5276730A (en) * 1992-04-30 1994-01-04 At&T Bell Laboratories Access method for distributed dynamic channel allocation in microcells
US5349580A (en) * 1992-05-08 1994-09-20 Scientific-Atlanta, Inc. Method and apparatus for channel allocation integrity in a communication network
US5440542A (en) * 1993-10-14 1995-08-08 Motorola, Inc. Method and apparatus for multiplexing control information into a user signal stream of a CDMA cellular system
US5442625A (en) * 1994-05-13 1995-08-15 At&T Ipm Corp Code division multiple access system providing variable data rate access to a user

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5299198A (en) * 1990-12-06 1994-03-29 Hughes Aircraft Company Method and apparatus for exploitation of voice inactivity to increase the capacity of a time division multiple access radio communications system
EP0587980A2 (en) * 1992-09-18 1994-03-23 Roke Manor Research Limited Improvements in or relating to cellular mobile radio systems
WO1996008934A2 (en) * 1994-09-16 1996-03-21 Ionica International Limited Transmission of digital data messages in digital telephony

Cited By (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6526281B1 (en) 1997-06-20 2003-02-25 Tantivy Communications, Inc. Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link
USRE45367E1 (en) 1997-06-20 2015-02-10 Intel Corporation Protocol conversion and bandwidth reduction technique providing multiple NB+D ISDN basic rate interface links over a wireless code division multiple access communication system
US6081536A (en) * 1997-06-20 2000-06-27 Tantivy Communications, Inc. Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link
US9408216B2 (en) 1997-06-20 2016-08-02 Intel Corporation Dynamic bandwidth allocation to transmit a wireless protocol across a code division multiple access (CDMA) radio link
US9525923B2 (en) 1997-12-17 2016-12-20 Intel Corporation Multi-detection of heartbeat to reduce error probability
US6388999B1 (en) 1997-12-17 2002-05-14 Tantivy Communications, Inc. Dynamic bandwidth allocation for multiple access communications using buffer urgency factor
US9042400B2 (en) 1997-12-17 2015-05-26 Intel Corporation Multi-detection of heartbeat to reduce error probability
US6236647B1 (en) 1998-02-24 2001-05-22 Tantivy Communications, Inc. Dynamic frame size adjustment and selective reject on a multi-link channel to improve effective throughput and bit error rate
US9307532B2 (en) 1998-06-01 2016-04-05 Intel Corporation Signaling for wireless communications
US8908654B2 (en) 1998-06-01 2014-12-09 Intel Corporation Dynamic bandwidth allocation for multiple access communications using buffer urgency factor
US6542481B2 (en) 1998-06-01 2003-04-01 Tantivy Communications, Inc. Dynamic bandwidth allocation for multiple access communication using session queues
WO1999063713A1 (en) * 1998-06-01 1999-12-09 Tantivy Communications, Inc. Dynamic bandwidth allocation in cdma system
US7088697B1 (en) 1998-12-09 2006-08-08 Siemens Aktiengesellschaft Methods and apparatus for transmitting data in a radio communication system including signaling allocation of a common channel
WO2000035225A1 (en) * 1998-12-09 2000-06-15 Siemens Aktiengesellschaft Method for data transmission in a radio communications system
JP2002539673A (en) * 1999-03-08 2002-11-19 クゥアルコム・インコーポレイテッド Rate allocation method in data communication network
US7106713B2 (en) 1999-03-08 2006-09-12 Qualcomm Incorporated Method of rate allocation in a data communications network
WO2000054438A1 (en) * 1999-03-08 2000-09-14 Qualcomm Incorporated Method of rate allocation in a data communications network
US6324172B1 (en) 1999-03-08 2001-11-27 Qualcomm Incorporated Method of rate allocation in a data communications network
US9232536B2 (en) 1999-04-08 2016-01-05 Intel Corporation Maintenance of channel usage in a wireless communication system
US6965778B1 (en) 1999-04-08 2005-11-15 Ipr Licensing, Inc. Maintenance of channel usage in a wireless communication system
US8045990B2 (en) 1999-04-08 2011-10-25 Ipr Licensing, Inc. Maintenance of channel usage in a wireless communication system
US8908652B2 (en) 1999-04-08 2014-12-09 Intel Corporation Maintenance of channel usage in a wireless communication system
US9408253B2 (en) 1999-09-21 2016-08-02 Ipr Licensing, Inc. Subscriber unit for managing dual wireless communication links
US9420632B2 (en) 1999-09-21 2016-08-16 Ipr Licensing, Inc. Subscriber unit for managing dual wireless communication links
KR100547851B1 (en) * 1999-12-29 2006-02-01 삼성전자주식회사 Data transmitting method in cdma system
US9807714B2 (en) 2000-02-07 2017-10-31 Intel Corporation Minimal maintenance link to support synchronization
US9301274B2 (en) 2000-02-07 2016-03-29 Intel Corporation Minimal maintenance link to support synchronization
CN1323495C (en) * 2000-06-24 2007-06-27 三星电子株式会社 Method and device used for transferring data speed control informaton
WO2002001761A1 (en) * 2000-06-24 2002-01-03 Samsung Electronics Co., Ltd Method and apparatus for transmitting data rate control information in mobile telecommunication system for packet data transmission
AU766241B2 (en) * 2000-06-24 2003-10-09 Samsung Electronics Co., Ltd. Method and apparatus for transmitting data rate control information in mobile telecommunication system for packet data transmission
KR100553067B1 (en) * 2000-07-01 2006-02-15 엘지전자 주식회사 Method for controlling DRC in Data Transport HDR system and data slot structure for the controlling DRC
KR100853948B1 (en) 2000-11-03 2008-08-25 루센트 테크놀러지스 인크 Apparatus and method for use in the multicast of traffic data in wireless multiple access communications systems
US9924468B2 (en) 2000-12-01 2018-03-20 Intel Corporation Antenna control system and method
US9775115B2 (en) 2000-12-01 2017-09-26 Intel Corporation Antenna control system and method
US9225395B2 (en) 2000-12-01 2015-12-29 Intel Corporation Antenna control system and method
KR100525387B1 (en) * 2000-12-20 2005-11-02 엘지전자 주식회사 Method for transmitting a large size of multicast message
US9247510B2 (en) 2001-02-01 2016-01-26 Intel Corporation Use of correlation combination to achieve channel detection
US9014118B2 (en) 2001-06-13 2015-04-21 Intel Corporation Signaling for wireless communications
KR100547793B1 (en) * 2001-12-29 2006-02-01 삼성전자주식회사 Method for controlling reverse data transmission in wireless telecommunication system
EP2587865A3 (en) * 2002-01-22 2017-11-08 IPR Licensing, Inc. Overhead reduction in a communications system
US8320298B2 (en) 2002-01-22 2012-11-27 Ipr Licensing, Inc. Techniques for reducing overhead in a communications system
US9999043B2 (en) 2002-01-22 2018-06-12 Ipr Licensing, Inc. Techniques for reducing overhead in a communications system
EP1476963A2 (en) * 2002-01-22 2004-11-17 IPR Licensing, Inc. Overhead reduction in a communications system
EP1476963A4 (en) * 2002-01-22 2010-02-10 Ipr Licensing Inc Overhead reduction in a communications system
NO341255B1 (en) * 2002-01-22 2017-09-25 Ipr Licensing Inc Reduction of channel management in a communication system
US10708909B2 (en) 2002-01-22 2020-07-07 Ipr Licensing, Inc. Techniques for reducing overhead in a communications system
US8699505B2 (en) 2002-05-31 2014-04-15 Qualcomm Incorporated Dynamic channelization code allocation
CN1326376C (en) * 2002-10-10 2007-07-11 Lg电子株式会社 System and method for supplying short message in high-speed packet data system
US8099099B2 (en) 2003-02-19 2012-01-17 Qualcomm Incorporated Methods and apparatus related to assignment in a wireless communications system
US7881327B2 (en) 2003-06-23 2011-02-01 Qualcomm Incorporated Code channel management in a wireless communications system
US7933250B2 (en) 2003-06-23 2011-04-26 Qualcomm Incorporated Code channel management in a wireless communications system
US8023474B2 (en) 2003-10-02 2011-09-20 Qualcomm Incorporated Systems and methods for communicating control data using multiple slot formats
US9585023B2 (en) 2003-10-30 2017-02-28 Qualcomm Incorporated Layered reuse for a wireless communication system
US8072942B2 (en) 2003-11-26 2011-12-06 Qualcomm Incorporated Code channel management in a wireless communications system
US7680475B2 (en) 2004-06-09 2010-03-16 Qualcomm Incorporated Dynamic ASBR scheduler
US8032145B2 (en) 2004-07-23 2011-10-04 Qualcomm Incorporated Restrictive reuse set management algorithm for equal grade of service on FL transmission
US8675509B2 (en) 2004-12-22 2014-03-18 Qualcomm Incorporated Feedback to support restrictive reuse
US8325826B2 (en) 2005-03-09 2012-12-04 Qualcomm Incorporated Methods and apparatus for transmitting signals facilitating antenna control
US8225186B2 (en) 2006-07-14 2012-07-17 Qualcomm Incorporated Ecoding and decoding methods and apparatus for use in a wireless communication system
US8539323B2 (en) 2006-07-14 2013-09-17 Qualcomm Incorporated Encoding and decoding methods and apparatus for use in a wireless communication system
WO2008008870A2 (en) * 2006-07-14 2008-01-17 Qualcomm Incorporated Methods and apparatus related to assignment in a wireless communications system
WO2008008870A3 (en) * 2006-07-14 2008-03-20 Qualcomm Inc Methods and apparatus related to assignment in a wireless communications system

Also Published As

Publication number Publication date
CN1276138A (en) 2000-12-06
AU3291497A (en) 1998-01-05
HK1019390A1 (en) 2000-02-03
FI982579A0 (en) 1998-11-27
JP3679132B2 (en) 2005-08-03
EP0903051A1 (en) 1999-03-24
IL127243A (en) 2003-01-12
FI982579A (en) 1999-02-01
AU716886B2 (en) 2000-03-09
IL127243A0 (en) 1999-09-22
DE69734652T2 (en) 2006-07-27
US5859840A (en) 1999-01-12
JP2000512094A (en) 2000-09-12
EP0903051B1 (en) 2005-11-16
BR9709482A (en) 1999-08-10
ATE310365T1 (en) 2005-12-15
RU2189696C2 (en) 2002-09-20
BR9709482B1 (en) 2010-11-03
CN1112829C (en) 2003-06-25
DE69734652D1 (en) 2005-12-22

Similar Documents

Publication Publication Date Title
US5859840A (en) Spread spectrum communication system which defines channel groups comprising selected channels that are additional to a primary channel and transmits group messages during call set up
US6480521B1 (en) Method and apparatus for transmitting high speed data in a spread spectrum communications system
CA2288779C (en) Device and method for exchanging frame messages of different lengths in cdma communication system
KR100290679B1 (en) Apparatus and method for communicating system having dedicated control channel
US5930230A (en) High data rate CDMA wireless communication system
KR101019546B1 (en) Multiplexing on the reverse link feedbacks for multiple forward link frequencies
JP3091229B2 (en) Method and apparatus for providing variable rate data in a communication system using a non-orthogonal overflow channel
US8934441B2 (en) Channel allocations in a communications system
US20010055329A1 (en) High data rate CDMA wireless communication system using variable sized channel codes
EP1596519A2 (en) A subsriber unit and method for use in a wireless communication system
AU3306497A (en) Subscriber unit for a cdma wireless communication system
JP2009219145A (en) Method and apparatus for high rate packet data transmission
JP2000511036A (en) Data communication apparatus and method for mobile communication system having dedicated control channel
US7298718B2 (en) Channel allocations in a communications system
KR100808526B1 (en) Components and methods for processing wireless communication data in presence of format uncertainty
JP2004513536A (en) Maximum distance block coding method
KR100491520B1 (en) Method and apparatus for high rate data transmission in a spread spectrum communication
MXPA98010014A (en) Method and device for the transmission of high speed data in an amp spectrum communications system
UA79237C2 (en) Communication techniques, communication system (variants), data transmission device (variants), data receiving device (variants)

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 97196753.9

Country of ref document: CN

AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG UZ VN AM AZ BY KG KZ MD RU TJ TM

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: PA/a/1998/010014

Country of ref document: MX

Ref document number: 982579

Country of ref document: FI

WWE Wipo information: entry into national phase

Ref document number: 1199800992

Country of ref document: VN

WWE Wipo information: entry into national phase

Ref document number: 1019980709782

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 1997928730

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1997928730

Country of ref document: EP

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: CA

WWP Wipo information: published in national office

Ref document number: 1019980709782

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 1019980709782

Country of ref document: KR

WWG Wipo information: grant in national office

Ref document number: 1997928730

Country of ref document: EP