US20110158221A1 - Support of Plural Chip Rates in CDMA System - Google Patents
Support of Plural Chip Rates in CDMA System Download PDFInfo
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- US20110158221A1 US20110158221A1 US13/046,081 US201113046081A US2011158221A1 US 20110158221 A1 US20110158221 A1 US 20110158221A1 US 201113046081 A US201113046081 A US 201113046081A US 2011158221 A1 US2011158221 A1 US 2011158221A1
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- timeslots
- user equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
- H04B7/264—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] for data rate control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70703—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation using multiple or variable rates
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J2011/0003—Combination with other multiplexing techniques
- H04J2011/0013—Combination with other multiplexing techniques with TDM/TDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- This invention relates to code division multiple access (CDMA) systems, and particularly (though not exclusively) to wireless CDMA systems operating in time division duplex (TDD) mode.
- CDMA code division multiple access
- TDD time division duplex
- CDMA code division multiple access communications
- the existing method to manage the transition between operating at a lower chip rate and a higher chip rate is for the operator to fully roll out a lower chip rate network before rolling out a higher chip rate network. If there are “islands” of higher chip rate coverage, the network will be able to hand over (to the high chip rate network cells) users with equipment capable of operation at both the lower and higher chip rate who enter the “island”: this provides some element of backward compatibility between the low and high chip rate networks. During such a transition period, the network operator will provide some subscribers with user equipment that is capable of operating at both the lower and the higher chip rates.
- the operator will only be able to use its lower chip rate network equipment to service the majority of users: only those (probably new) users that have been supplied with user equipment capable of operating at the higher chip rate will be able to get service from the higher chip rate network equipment.
- CDMA code division multiple access
- a base station for use in a code division multiple access (CDMA) system supporting a plurality of chip rates, as claimed in claim 47 .
- CDMA code division multiple access
- user equipment for use in a CDMA system supporting a plurality of chip rates, as claimed in claim 69 .
- FIG. 1 shows a block schematic diagram illustrating a 3GPP radio communication system in which the present invention may be used
- FIG. 2 shows a block schematic diagram illustrating a possible timeslot structure for a low chip rate system
- FIG. 3 shows a block schematic diagram illustrating a possible timeslot structure for a high chip rate system
- FIG. 4 shows a block schematic diagram illustrating a possible timeslot structure for a mixed chip rate system
- FIG. 5 shows a block schematic diagram illustrating a possible timeslot structure for a mixed chip rate system with multiple switching points
- FIG. 6 shows a block schematic diagram illustrating a possible timeslot structure for multi chip rate operation using a single low chip rate carrier
- FIG. 7 shows a block schematic diagram illustrating a possible timeslot structure for multi chip rate operation using multiple low chip rate carriers
- a typical, standard UMTS Radio Access Network (UTRAN) system 100 is conveniently considered as comprising: a terminal/user equipment domain 110 ; a UMTS Terrestrial Radio Access Network domain 120 ; and an infrastructure domain 130 .
- UTRAN Universal Terrestrial Radio Access Network
- terminal equipment (TE) 110 A is connected to mobile equipment (ME) 110 B via the wired or wireless R interface.
- the ME 110 B is also connected to a user service identity module (USIM) 110 C; the ME 110 B and the USIM 110 C together are considered as a user equipment (UE) 110 D.
- the UE 110 D communicates data with a Node B (base station) 120 A in the radio access network domain ( 120 ) via the wireless Uu interface.
- the Node B 120 A communicates with a radio network controller (RNC) 120 B via the Iub interface.
- the RNC 120 B communicates with other RNC's (not shown) via the Iur interface.
- the Node B 120 A and the RNC 120 B together form the UTRAN 120 C.
- the RNC 120 B communicates with a serving GPRS service node (SGSN) 130 A in the core network domain 130 via the Iu interface.
- SGSN serving GPRS service node
- the SGSN 130 A communicates with a gateway GPRS support node 130 B via the Gn interface;
- the SGSN 130 A and the GGSN 130 B communicate with a home location register (HLR) server 130 C via the Gr interface and the Gc interface respectively.
- the GGSN 130 B communicates with public data network 130 D via the Gi interface.
- the elements RNC 120 B, SGSN 130 A and GGSN 130 B are conventionally provided as discrete and separate units (on their own respective software/hardware platforms) divided across the radio access network domain ( 120 ) and the core network domain ( 130 ), as shown the FIG. 1 .
- the RNC 120 B is the UTRAN element responsible for the control and allocation of resources for numerous Node B's 120 A; typically 50 to 100 Node B's may be controlled by one RNC.
- the RNC also provides reliable delivery of user traffic over the air interfaces. RNC's communicate with each other (via the Iur interface) to support handover and macrodiversity.
- the SGSN 130 A is the UMTS Core Network element responsible for Session Control and interface to the HLR.
- the SGSN keeps track of the location of an individual UE and performs security functions and access control.
- the SGSN is a large centralised controller for many RNCs.
- the GGSN 130 B is the UMTS Core Network element responsible for concentrating and tunneling user data within the core packet network to the ultimate destination (e.g., internet service provider—ISP).
- ISP internet service provider
- the system 100 is a multiple chip rate system employing a lower chip rate and a higher chip rate.
- the chip rates are integer multiples of 3.84 Mcps: the lower chip rate is 3.84 Mcps and the higher chip rate is 7.68 Mcps.
- communication on the wireless interface Uu between UE 110 D and Node B 120 A occurs in a variety of predefined channels.
- the timeslot structure, for signalling on the wireless interface Uu between UE 110 D and Node B 120 A, for a lower chip rate system (assumed to be a chip rate of 3.84 Mcps in this example) could be assigned as shown in FIG. 2 .
- a single frame 200 is shown containing 15 timeslots.
- 5 timeslots (the right-most 5 timeslots depicted in the figure) are shown as uplink timeslots (for data transmitted in the direction from the user equipment to the network) and 10 timeslots (the left-most 10 timeslots depicted in the figure) are shown in the downlink (for data transmitted in the direction from the network to the user equipment).
- One of the downlink timeslots (the left-most timeslot depicted in the figure), in this case labeled “3.84 beacon”, has a special purpose: it used to contain “beacon” data for performing a beacon function (as is well understood in a 3GPP system, and need not be described in further detail). However, it will be understood that in general this timeslot need not necessarily be used to perform a beacon function.
- An example timeslot structure for a higher chip rate system (assumed to be a chip rate of 7.68 Mcps in this example) could be assigned as shown in FIG. 3 .
- a single frame 300 is shown containing 15 timeslots (it is assumed for the purposes of this example that the timeslot duration and frame duration of the high chip rate and low chip rate systems are identical).
- 5 timeslots (the right-most 5 timeslots depicted in the figure) are shown as uplink timeslots (for data transmitted in the direction from the user equipment to the network) and 10 timeslots (the left-most 10 timeslots depicted in the figure) are shown in the downlink (for data transmitted in the direction from the network to the user equipment).
- One of the downlink timeslots (the left-most timeslot depicted in the figure), in this case labeled “7.68 beacon”, has a special purpose: it used to contain “beacon” data for performing a beacon function (as is well understood in a 3GPP system, and need not be described in further detail). However, it will be understood that in general this timeslot need not necessarily be used to perform a beacon function.
- FIG. 4 shows a possible timeslot structure relating to the invention. This figure numbers the timeslots in increasing order. In a subsequent frame, the timeslot numbering would reset to zero for the first timeslot of that subsequent frame and the frame number would increment.
- timeslots 0-8 are assigned to the lower chip rate (3.84 Mcps). 6 of these timeslots (timeslots 0-5) are downlink timeslots and 3 (timeslots 6-8) are uplink timeslots.
- One of the lower chip rate downlink timeslots (timeslot 0) is shown as a special purpose timeslot (in this case, it is referred to as the “3.84 beacon” timeslot).
- 6 timeslots (timeslots 9-14) are assigned to the higher chip rate (7.68 Mcps). 4 of these timeslots (timeslots 9-12) are downlink and 2 (timeslots 13 and 14) are uplink timeslots.
- timeslot 9-12 are downlink and 2 (timeslots 13 and 14) are uplink timeslots.
- One of the higher chip rate downlink timeslots (timeslot 9) is shown as a special purpose timeslot (in this case, it is referred to as the “7.68 beacon” timeslot).
- this UE would search for the special purpose (“3.84 beacon”) timeslot.
- the UE finds the special purpose lower chip rate timeslot it will recognise the existence of the network cell (in this example, it is assumed that the network is a cellular system) and will camp on that cell.
- the UE will signal to the network that it exists using the lower chip rate in one of the timeslots 6-8.
- the network will recognise that the UE is a low chip rate UE and will only assign it resources in timeslots 0-8 in the future (for instance, if it assigns the UE a dedicated resource, it might assign it a single downlink channel in timeslot 5 once per frame and a single uplink channel in timeslot 8 once per frame—note that in a CDMA system, multiple channels may be supported per timeslot).
- this UE would search for the special purpose (“7.68 beacon”) timeslot and would ignore the lower chip rate special purpose (“3.84 beacon”) timeslot.
- the UE finds the special purpose higher chip rate timeslot it will recognise the existence of the network cell and will camp on that cell. The UE will signal to the network that it exists using the higher chip rate in the timeslot 13 or 14.
- the network will recognise that the UE is a high chip rate UE and will only assign it resources in timeslots 9-14 in the future (for instance, if it assigns the UE a dedicated resource, it might assign it a single downlink channel in timeslot 10 once per frame and a single uplink channel in timeslot 14 once per frame—note that in a CDMA system, multiple channels may be supported per timeslot).
- the UE searches for the lower chip rate special purpose slot in preference to the higher chip rate special purpose slot. If the UE finds the lower chip rate special purpose slot, it will notify the cell of its existence and camp on the cell at the lower chip rate. The UE will inform the network of its capability to operate at the higher chip rate. The network may then decide to handover the UE to the higher chip rate network function. In this case, the UE camps on the higher chip rate in preference to the lower chip rate and the higher chip rate function in the network will allocate higher chip rate resource to the UE (from timeslots 9-14 in this example).
- the UE displays some inflexibility between operating at the two chip rates: the UE is capable of changing only slowly from one chip rate to another, thus the network performs handover of dual mode equipment between the two chip rate networks and the different chip rate networks essentially operate independently.
- the UE searches for the lower chip rate special purpose slot in preference to the higher chip rate special purpose slot. If the UE finds the lower chip rate special purpose slot, it will notify the cell of its existence and camp on the cell at the lower chip rate. The UE will inform the network of its capability to operate at the higher chip rate. The network may then allocate either lower chip rate (from timeslots 0-8 in this example) or higher chip rate resource (from timeslots 9-14 in this example) to the UE (a single allocation might even span the lower and higher chip rates such that a single allocation contains both lower chip rate and higher chip rate resource, e.g., timeslots 5, 8 and 9).
- lower chip rate from timeslots 0-8 in this example
- higher chip rate resource from timeslots 9-14 in this example
- the UE is capable of operating at both the lower and higher chip rates and can change between chip rates either every timeslot or every frame.
- the lower chip rate and higher chip rate portions of the network are able to operate together (this arrangement may provide more capacity than when the higher and lower chip rate network functions operate independently due to trunking efficiency gains).
- the UE In this second scenario, the UE must be aware of the chip rates that apply in the slots that it has been allocated.
- the UE could autonomously detect the chip rate in the slot. This could be done by known methods such as spectral (frequency) analysis of the received data, analysis and comparison of the results of channel estimation, analysis of multi-user detector output, etc.—for example, in the case of channel estimation, channel estimates could be produced at 3.84 Mcps and 7.68 Mcps and then it could be assumed if the 3.84 Mcps channel estimate is better than the 7.68 Mcps channel estimate that the slot is actually 3.84 Mcps.
- the UE could be told of the chip rate via higher layer signalling in an allocation message or could be told of the chip rate via broadcast higher layer signalling.
- the UE could alternatively search for the higher chip rate special purpose slot in preference to the lower chip rate and the functionality in this case will be clear to those skilled in the art from the preceding description.
- Embodiment 1 and Embodiment 2 described above in relation to FIG. 4 showed a slot structure with a single switching point between the lower chip rate system and the higher chip rate system (in the sense that the lower chip rate system occupied the low indexed timeslots and the high chip rate system occupied the high indexed timeslots), it will be appreciated that there may in fact be multiple switching points between low chip rate and high chip rate systems.
- a slot structure (“Embodiment 3”) with multiple switching points is illustrated in FIG. 5 .
- the timeslot structure of Embodiment 3 might be used for a variety of reasons.
- the timeslot structure 500 of FIG. 5 might be used to allow for “synchronisation case 2”, which uses beacon slots per frame, one of the beacon slots being slot k, and the other being slot in k+8.
- “synchronisation case 2” can facilitate inter-frequency and inter-system measurements (the UE can decode the beacon in the current frequency and then 8 slots later, it can look at the beacon on another frequency); it may also aid power control.
- FIG. 5 illustrates aspects of the operation of the invention in the time domain. Aspects of the operation of the invention in the frequency domain are now considered. The following example embodiments relate to the example embodiments and main embodiment of the invention described previously.
- the network operates within a spectral allocation of W high (for example, if the network supports operation at both 3.84 Mcps and 7.68 Mcps, then the spectral allocation for the network as a whole will be the bandwidth required to support a chip rate of 7.68 Mcps which is typically 10 MHz).
- a timeslot frame structure 600 is employed and the network operates a single 3.84 Mcps network function in the lower chip rate timeslots (timeslots 0-8) and a single 7.68 Mcps network function in the higher chip rate timeslots (timeslots 9-14).
- the spectrum of the 3.84 Mcps network function sits centrally in the spectrum allocation of the network as a whole (as illustrated by the waveforms depicted in the lower chip rate timeslots 0-8 in FIG. 6 ).
- the carrier frequency of the 3.84 Mcps network function is the same as the carrier frequency of the 7.68 Mcps network function.
- Embodiments 1 and 2 fit more easily into this case.
- synthesisers and other RF components
- This Embodiment 4 may be used with Embodiments 1 and 2 described above.
- a timeslot frame structure 700 is employed and the network operates two separate 3.84 Mcps network functions in the lower chip rate timeslots (timeslots 0-8) and a single 7.68 Mcps network function in the higher chip rate timeslots (timeslots 9-14).
- two separate 3.84 Mcps network functions 710 and 720 ) coexist at the same time but are separated in frequency. As can be seen in FIG.
- the waveforms depicted in the lower chip rate timeslots 0-8 in function 710 are centred on a higher frequency
- the waveforms depicted in the lower chip rate timeslots 0-8 in function 720 are centred on a lower frequency offset from the higher frequency in function 710 .
- the network has approximately twice the capacity at the lower chip rate than in the scenario described above (Embodiment 3).
- the network can transfer users by handover operations between low chip rate carriers or between a low chip rate carrier and the high chip rate carrier and vice versa (according to the capabilities of the UE).
- Embodiment 5 can be used with Embodiments 1 and 2 described above, though in the case of Embodiment 2 the UE will need to be informed of carrier frequencies and offsets of the one chip rate system relative to the other chip rate system (for example, if the UE is allocated timeslots 5, 8 and 9, the network will need to inform the UE of the carrier frequency of the higher chip rate system relative to the carrier frequency of the lower chip rate system).
- the time slot allocations may be signalled to the UE via broadcast signalling (e.g., in system information blocks), via point to point signalling (e.g., defining the timeslot parameters for a single or a multiplicity of allocations).
- the point to point signalling may be carried in radio resource control (RRC) messages, medium access control (MAC) messages (e.g., applied to High Speed Downlink Packet Access—HSDPA) or physical layer messages (similar to TFCI signalling).
- RRC radio resource control
- MAC medium access control
- HSDPA High Speed Downlink Packet Access—HSDPA
- HSDPA High Speed Downlink Packet Access—HSDPA
- the UE may autonomously determine the chip rate applied in a timeslot.
- each chip rate system may act independently of the other chip rate system (to the extent that any one chip rate would still function if the other chip rates were switched off in the frame: each chip rate is essentially controlled independently of the other chip rates), or one of the chip rates may operate collaboratively with another chip rate (the chip rates are controlled by a common controlling entity).
- the number of lower chip rate functions may be proportional the ratio of the bandwidth of the higher chip rate system to the bandwidth of the lower chip rate system.
- the method for supporting a plurality of chip rates in a CDMA system described above may be carried out in software running on a processor (not shown) in a Node B or UE, and that the software may be provided as a computer program element carried on any suitable data carrier (also not shown) such as a magnetic or optical computer disc.
- CDMA code division multiple access
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Abstract
Description
- This application is a continuation of and claims the benefit of U.S. patent application Ser. No. 10/537,195, filed on Jun. 2, 2005, which application claims the benefit of and is a 371 filing of PCT Patent Application No. PCT/GB03/05361, Filed Dec. 9, 2003, which application claims the benefit of United Kingdom Application No. GB 0228613.6 filed Dec. 9, 2002. The content of these documents is fully incorporated herein in their entirety.
- This invention relates to code division multiple access (CDMA) systems, and particularly (though not exclusively) to wireless CDMA systems operating in time division duplex (TDD) mode.
- In the field of this invention it is known that there are currently code division multiple access communications (CDMA) systems that operate at a single chip rate. As demand grows for bandwidth intensive applications, telecommunications will have to be carried at ever higher chip rates. It may be difficult for an organisation that operates a telecommunications network (an operator) to perform the transition between operating a lower chip rate and a higher chip rate network.
- The existing method to manage the transition between operating at a lower chip rate and a higher chip rate is for the operator to fully roll out a lower chip rate network before rolling out a higher chip rate network. If there are “islands” of higher chip rate coverage, the network will be able to hand over (to the high chip rate network cells) users with equipment capable of operation at both the lower and higher chip rate who enter the “island”: this provides some element of backward compatibility between the low and high chip rate networks. During such a transition period, the network operator will provide some subscribers with user equipment that is capable of operating at both the lower and the higher chip rates. During this transition period, the operator will only be able to use its lower chip rate network equipment to service the majority of users: only those (probably new) users that have been supplied with user equipment capable of operating at the higher chip rate will be able to get service from the higher chip rate network equipment.
- However, a problem with the above-described existing method of managing the transition between high and low chip rates is that there is a time during which the network operator is investing in higher chip rate equipment (presumably since the network operator believes that more network capacity is required), but is unable to gain significant revenue from users on this equipment (only those users who have been supplied with dual mode low chip rate/high chip rate equipment will be able to use the newly installed high chip rate equipment). There is thus a built-in reluctance for the network operator to upgrade its network to higher chip rate equipment. In this case, users may suffer from a poorer service, network operators may suffer from either missed revenue that could be obtained from new and enhanced services at the higher chip rate or having to invest in network equipment from which little revenue is additionally obtained, equipment providers may suffer from network operators being unwilling to invest in higher chip rate network equipment until users have been upgraded to higher chip rate user equipment.
- A further problem arises in the case where a network operates equipment at a higher chip rate and users roam onto that network with lower chip rate equipment. If the user's equipment is incapable of operating at the higher chip rate, the user will not receive service and the network will lose possible revenue that could have been derived from the roaming user.
- A need therefore exists for support of multiple chip rates wherein the abovementioned disadvantage(s) may be alleviated.
- In accordance with a first aspect of the present invention there is provided a method, for supporting of plurality of chip rates in a code division multiple access (CDMA) system, as claimed in
claim 1. - In accordance with a second aspect of the present invention there is provided a code division multiple access (CDMA) system, for supporting a plurality of chip rates, as claimed in claim 24.
- In accordance with a third aspect of the present invention there is provided a base station, for use in a code division multiple access (CDMA) system supporting a plurality of chip rates, as claimed in claim 47.
- In accordance with a fourth aspect of the present invention there is provided user equipment, for use in a CDMA system supporting a plurality of chip rates, as claimed in claim 69.
- Several schemes for support of multiple chip rates in a CDMA TDD cell, incorporating the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
-
FIG. 1 shows a block schematic diagram illustrating a 3GPP radio communication system in which the present invention may be used; -
FIG. 2 shows a block schematic diagram illustrating a possible timeslot structure for a low chip rate system; -
FIG. 3 shows a block schematic diagram illustrating a possible timeslot structure for a high chip rate system; -
FIG. 4 shows a block schematic diagram illustrating a possible timeslot structure for a mixed chip rate system; -
FIG. 5 shows a block schematic diagram illustrating a possible timeslot structure for a mixed chip rate system with multiple switching points; -
FIG. 6 shows a block schematic diagram illustrating a possible timeslot structure for multi chip rate operation using a single low chip rate carrier; and -
FIG. 7 shows a block schematic diagram illustrating a possible timeslot structure for multi chip rate operation using multiple low chip rate carriers - Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions and/or relative positioning of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of various embodiments of the present invention. Also, common but well-understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to facilitate a less obstructed view of these various embodiments of the present invention. It will further be appreciated that certain actions and/or steps may be described or depicted in a particular order of occurrence while those skilled in the art will understand that such specificity with respect to sequence is not actually required. It will also be understood that the terms and expressions used herein have the ordinary technical meaning as is accorded to such terms and expressions by persons skilled in the technical field as set forth above except where different specific meanings have otherwise been set forth herein.
- Referring firstly to
FIG. 1 , a typical, standard UMTS Radio Access Network (UTRAN)system 100 is conveniently considered as comprising: a terminal/user equipment domain 110; a UMTS Terrestrial Radio Access Networkdomain 120; and aninfrastructure domain 130. - In the terminal/
user equipment domain 110, terminal equipment (TE) 110A is connected to mobile equipment (ME) 110B via the wired or wireless R interface. The ME 110B is also connected to a user service identity module (USIM) 110C; theME 110B and the USIM 110C together are considered as a user equipment (UE) 110D. The UE 110D communicates data with a Node B (base station) 120A in the radio access network domain (120) via the wireless Uu interface. Within the radioaccess network domain 120, the NodeB 120A communicates with a radio network controller (RNC) 120B via the Iub interface. TheRNC 120B communicates with other RNC's (not shown) via the Iur interface. TheNode B 120A and theRNC 120B together form the UTRAN 120C. The RNC 120B communicates with a serving GPRS service node (SGSN) 130A in thecore network domain 130 via the Iu interface. Within thecore network domain 130, the SGSN 130A communicates with a gatewayGPRS support node 130B via the Gn interface; the SGSN 130A and the GGSN 130B communicate with a home location register (HLR)server 130C via the Gr interface and the Gc interface respectively. The GGSN 130B communicates withpublic data network 130D via the Gi interface. - Thus, the
elements RNC 120B, SGSN 130A and GGSN 130B are conventionally provided as discrete and separate units (on their own respective software/hardware platforms) divided across the radio access network domain (120) and the core network domain (130), as shown theFIG. 1 . - The
RNC 120B is the UTRAN element responsible for the control and allocation of resources for numerous Node B's 120A; typically 50 to 100 Node B's may be controlled by one RNC. The RNC also provides reliable delivery of user traffic over the air interfaces. RNC's communicate with each other (via the Iur interface) to support handover and macrodiversity. - The SGSN 130A is the UMTS Core Network element responsible for Session Control and interface to the HLR. The SGSN keeps track of the location of an individual UE and performs security functions and access control. The SGSN is a large centralised controller for many RNCs.
- The GGSN 130B is the UMTS Core Network element responsible for concentrating and tunneling user data within the core packet network to the ultimate destination (e.g., internet service provider—ISP).
- Such a UTRAN system and its operation are described more fully in the 3.sup.rd Generation Partnership Project technical specification documents 3GPP TS 25.401, 3GPP TS 23.060, and related documents, available from the 3GPP website at www.3gpp.org, and need not be described herein in more detail.
- Several embodiments of the present invention are described below, beginning with a main embodiment, which is a general example that is applicable to the further described embodiments.
- In the main embodiment of present invention, the
system 100 is a multiple chip rate system employing a lower chip rate and a higher chip rate. As an example, assume that the chip rates are integer multiples of 3.84 Mcps: the lower chip rate is 3.84 Mcps and the higher chip rate is 7.68 Mcps. As is well known, communication on the wireless interface Uu between UE 110D and Node B 120A occurs in a variety of predefined channels. The timeslot structure, for signalling on the wireless interface Uu betweenUE 110D andNode B 120A, for a lower chip rate system (assumed to be a chip rate of 3.84 Mcps in this example) could be assigned as shown inFIG. 2 . - In
FIG. 2 , asingle frame 200 is shown containing 15 timeslots. 5 timeslots (the right-most 5 timeslots depicted in the figure) are shown as uplink timeslots (for data transmitted in the direction from the user equipment to the network) and 10 timeslots (the left-most 10 timeslots depicted in the figure) are shown in the downlink (for data transmitted in the direction from the network to the user equipment). One of the downlink timeslots (the left-most timeslot depicted in the figure), in this case labeled “3.84 beacon”, has a special purpose: it used to contain “beacon” data for performing a beacon function (as is well understood in a 3GPP system, and need not be described in further detail). However, it will be understood that in general this timeslot need not necessarily be used to perform a beacon function. - An example timeslot structure for a higher chip rate system (assumed to be a chip rate of 7.68 Mcps in this example) could be assigned as shown in
FIG. 3 . - In
FIG. 3 , asingle frame 300 is shown containing 15 timeslots (it is assumed for the purposes of this example that the timeslot duration and frame duration of the high chip rate and low chip rate systems are identical). 5 timeslots (the right-most 5 timeslots depicted in the figure) are shown as uplink timeslots (for data transmitted in the direction from the user equipment to the network) and 10 timeslots (the left-most 10 timeslots depicted in the figure) are shown in the downlink (for data transmitted in the direction from the network to the user equipment). One of the downlink timeslots (the left-most timeslot depicted in the figure), in this case labeled “7.68 beacon”, has a special purpose: it used to contain “beacon” data for performing a beacon function (as is well understood in a 3GPP system, and need not be described in further detail). However, it will be understood that in general this timeslot need not necessarily be used to perform a beacon function. -
FIG. 4 shows a possible timeslot structure relating to the invention. This figure numbers the timeslots in increasing order. In a subsequent frame, the timeslot numbering would reset to zero for the first timeslot of that subsequent frame and the frame number would increment. - In the
timeslot structure 400 shown inFIG. 4 , 9 timeslots (timeslots 0-8) are assigned to the lower chip rate (3.84 Mcps). 6 of these timeslots (timeslots 0-5) are downlink timeslots and 3 (timeslots 6-8) are uplink timeslots. One of the lower chip rate downlink timeslots (timeslot 0) is shown as a special purpose timeslot (in this case, it is referred to as the “3.84 beacon” timeslot). InFIG. 4 , 6 timeslots (timeslots 9-14) are assigned to the higher chip rate (7.68 Mcps). 4 of these timeslots (timeslots 9-12) are downlink and 2 (timeslots 13 and 14) are uplink timeslots. One of the higher chip rate downlink timeslots (timeslot 9) is shown as a special purpose timeslot (in this case, it is referred to as the “7.68 beacon” timeslot). - Considering the case when a UE that is only capable of operating at the lower chip rate roams into a network employing the timeslot structure shown in
FIG. 4 , this UE would search for the special purpose (“3.84 beacon”) timeslot. When the UE finds the special purpose lower chip rate timeslot, it will recognise the existence of the network cell (in this example, it is assumed that the network is a cellular system) and will camp on that cell. The UE will signal to the network that it exists using the lower chip rate in one of the timeslots 6-8. The network will recognise that the UE is a low chip rate UE and will only assign it resources in timeslots 0-8 in the future (for instance, if it assigns the UE a dedicated resource, it might assign it a single downlink channel intimeslot 5 once per frame and a single uplink channel intimeslot 8 once per frame—note that in a CDMA system, multiple channels may be supported per timeslot). - Now considering the case when a UE that is only capable of operating at the higher chip rate roams into a network employing the timeslot structure shown in
FIG. 4 , this UE would search for the special purpose (“7.68 beacon”) timeslot and would ignore the lower chip rate special purpose (“3.84 beacon”) timeslot. When the UE finds the special purpose higher chip rate timeslot, it will recognise the existence of the network cell and will camp on that cell. The UE will signal to the network that it exists using the higher chip rate in thetimeslot timeslot 10 once per frame and a single uplink channel intimeslot 14 once per frame—note that in a CDMA system, multiple channels may be supported per timeslot). - When a UE that is capable of operation at either the lower chip rate (3.84 Mcps in this example) or at the higher chip rate (7.68 Mcps in this example) roams into a network employing the timeslot structure in shown in
FIG. 4 , there are several possible scenarios that can be considered (these are described as “Embodiment 1” and “Embodiment 2” in the following description). - In a first scenario, the UE searches for the lower chip rate special purpose slot in preference to the higher chip rate special purpose slot. If the UE finds the lower chip rate special purpose slot, it will notify the cell of its existence and camp on the cell at the lower chip rate. The UE will inform the network of its capability to operate at the higher chip rate. The network may then decide to handover the UE to the higher chip rate network function. In this case, the UE camps on the higher chip rate in preference to the lower chip rate and the higher chip rate function in the network will allocate higher chip rate resource to the UE (from timeslots 9-14 in this example). In this first scenario, the UE displays some inflexibility between operating at the two chip rates: the UE is capable of changing only slowly from one chip rate to another, thus the network performs handover of dual mode equipment between the two chip rate networks and the different chip rate networks essentially operate independently.
- In a second scenario, the UE searches for the lower chip rate special purpose slot in preference to the higher chip rate special purpose slot. If the UE finds the lower chip rate special purpose slot, it will notify the cell of its existence and camp on the cell at the lower chip rate. The UE will inform the network of its capability to operate at the higher chip rate. The network may then allocate either lower chip rate (from timeslots 0-8 in this example) or higher chip rate resource (from timeslots 9-14 in this example) to the UE (a single allocation might even span the lower and higher chip rates such that a single allocation contains both lower chip rate and higher chip rate resource, e.g.,
timeslots - In this second scenario, the UE must be aware of the chip rates that apply in the slots that it has been allocated. The UE could autonomously detect the chip rate in the slot. This could be done by known methods such as spectral (frequency) analysis of the received data, analysis and comparison of the results of channel estimation, analysis of multi-user detector output, etc.—for example, in the case of channel estimation, channel estimates could be produced at 3.84 Mcps and 7.68 Mcps and then it could be assumed if the 3.84 Mcps channel estimate is better than the 7.68 Mcps channel estimate that the slot is actually 3.84 Mcps. Alternatively, the UE could be told of the chip rate via higher layer signalling in an allocation message or could be told of the chip rate via broadcast higher layer signalling.
- Clearly, in the above two scenarios, the UE could alternatively search for the higher chip rate special purpose slot in preference to the lower chip rate and the functionality in this case will be clear to those skilled in the art from the preceding description.
- Whereas
Embodiment 1 andEmbodiment 2 described above in relation toFIG. 4 showed a slot structure with a single switching point between the lower chip rate system and the higher chip rate system (in the sense that the lower chip rate system occupied the low indexed timeslots and the high chip rate system occupied the high indexed timeslots), it will be appreciated that there may in fact be multiple switching points between low chip rate and high chip rate systems. A slot structure (“Embodiment 3”) with multiple switching points is illustrated inFIG. 5 . - The timeslot structure of
Embodiment 3 might be used for a variety of reasons. In particular, in the case of a UMTS TDD system, thetimeslot structure 500 ofFIG. 5 might be used to allow for “synchronisation case 2”, which uses beacon slots per frame, one of the beacon slots being slot k, and the other being slot ink+ 8. As will be understood, “synchronisation case 2” can facilitate inter-frequency and inter-system measurements (the UE can decode the beacon in the current frequency and then 8 slots later, it can look at the beacon on another frequency); it may also aid power control. - The example of
FIG. 5 illustrates aspects of the operation of the invention in the time domain. Aspects of the operation of the invention in the frequency domain are now considered. The following example embodiments relate to the example embodiments and main embodiment of the invention described previously. - For the following example, assume that the bandwidth required to support the lower chip rate system is Wlow (for a 3.84 Mcps system, Wlow is typically 5 MHz) and the bandwidth required to support the high chip rate system is Whigh (for a 7.68 Mcps system, Whigh is typically 10 MHz). There are several scenarios for the operation of the lower chip rate timeslots in the frequency domain (these are described as “
Embodiment 4” and “Embodiment 5” in the following description). In each of the scenarios, it is assumed that the network operates within a spectral allocation of Whigh (for example, if the network supports operation at both 3.84 Mcps and 7.68 Mcps, then the spectral allocation for the network as a whole will be the bandwidth required to support a chip rate of 7.68 Mcps which is typically 10 MHz). - Referring now to
FIG. 6 , in a first frequency domain scenario, atimeslot frame structure 600 is employed and the network operates a single 3.84 Mcps network function in the lower chip rate timeslots (timeslots 0-8) and a single 7.68 Mcps network function in the higher chip rate timeslots (timeslots 9-14). In the lower chip rate timeslots (timeslots 0-8), the spectrum of the 3.84 Mcps network function sits centrally in the spectrum allocation of the network as a whole (as illustrated by the waveforms depicted in the lower chip rate timeslots 0-8 inFIG. 6 ). In this case, the carrier frequency of the 3.84 Mcps network function is the same as the carrier frequency of the 7.68 Mcps network function. This arrangement may be advantageous when dual mode UEs can receive allocations at the two chip rates within the same frame. The main benefit of this single low chip rate system in the low chip rate timeslots may be thatEmbodiments Embodiment 4 may be used withEmbodiments - Referring now to
FIG. 7 , in a second frequency domain scenario, atimeslot frame structure 700 is employed and the network operates two separate 3.84 Mcps network functions in the lower chip rate timeslots (timeslots 0-8) and a single 7.68 Mcps network function in the higher chip rate timeslots (timeslots 9-14). In the lower chip rate timeslots, two separate 3.84 Mcps network functions (710 and 720) coexist at the same time but are separated in frequency. As can be seen inFIG. 7 , the waveforms depicted in the lower chip rate timeslots 0-8 in function 710 are centred on a higher frequency, and the waveforms depicted in the lower chip rate timeslots 0-8 in function 720 are centred on a lower frequency offset from the higher frequency in function 710. In this scenario, the network has approximately twice the capacity at the lower chip rate than in the scenario described above (Embodiment 3). In this scenario the network can transfer users by handover operations between low chip rate carriers or between a low chip rate carrier and the high chip rate carrier and vice versa (according to the capabilities of the UE). ThisEmbodiment 5 can be used withEmbodiments Embodiment 2 the UE will need to be informed of carrier frequencies and offsets of the one chip rate system relative to the other chip rate system (for example, if the UE is allocatedtimeslots - It will be understood that the number of timeslots allocated to a particular chip rate may be fixed (as described above) or may be dynamically varied from frame to frame. The time slot allocations may be signalled to the UE via broadcast signalling (e.g., in system information blocks), via point to point signalling (e.g., defining the timeslot parameters for a single or a multiplicity of allocations). The point to point signalling may be carried in radio resource control (RRC) messages, medium access control (MAC) messages (e.g., applied to High Speed Downlink Packet Access—HSDPA) or physical layer messages (similar to TFCI signalling).
- Alternatively, the UE may autonomously determine the chip rate applied in a timeslot.
- It will be further understood that each chip rate system may act independently of the other chip rate system (to the extent that any one chip rate would still function if the other chip rates were switched off in the frame: each chip rate is essentially controlled independently of the other chip rates), or one of the chip rates may operate collaboratively with another chip rate (the chip rates are controlled by a common controlling entity).
- It will be further understood that although in Embodiment described above in relation to
FIG. 7 two instantiations of lower chip rate functions are supported at different frequencies, the number of lower chip rate functions may be proportional the ratio of the bandwidth of the higher chip rate system to the bandwidth of the lower chip rate system. - It will be appreciated that the method for supporting a plurality of chip rates in a CDMA system described above may be carried out in software running on a processor (not shown) in a Node B or UE, and that the software may be provided as a computer program element carried on any suitable data carrier (also not shown) such as a magnetic or optical computer disc.
- It will be also be appreciated that the method for supporting a plurality of chip rates in a code division multiple access (CDMA) system described above may alternatively be carried out in hardware, for example in the form of an integrated circuit (not shown) such as an FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit) in the Node B or UE.
- It will further be understood that although the preferred embodiments have been described above in the context of a UTRA TDD wireless system, the invention may be generally applied to any CDMA system supporting two or more chip rates.
- It will be understood that the scheme for support of different chip rates described above provides the following advantages:
- provides backwards compatibility of a network including higher chip rate functionality with existing lower chip rate user equipment.
- allows greater network capacity during the transition phase from a low chip rate network to a high chip rate network.
- allows a network operator with a high chip rate network to provide service to roaming users from low chip rate networks.
Claims (24)
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2396275B (en) | 2002-12-09 | 2006-03-15 | Ipwireless Inc | Support of plural chip rates in a CDMA system |
EP2039202B1 (en) * | 2006-07-07 | 2017-12-13 | Telefonaktiebolaget LM Ericsson (publ) | Resource allocation for co-existin networks |
US9226289B2 (en) * | 2012-12-18 | 2015-12-29 | Qualcomm Incorporated | Systems and methods to conserve power of machine-to-machine devices using a shared data channel |
US9019895B2 (en) * | 2013-01-09 | 2015-04-28 | Qualcomm Incorporated | Methods and apparatus for controlling access points coupled to a common power source |
US9603008B2 (en) | 2013-04-05 | 2017-03-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and network nodes for handling information associated with one or more UMTS cells |
US11463125B2 (en) * | 2017-03-20 | 2022-10-04 | Hyphy Usa Inc. | Transporting sampled signals over multiple electromagnetic pathways |
CN113316094B (en) * | 2020-02-26 | 2023-03-31 | 成都鼎桥通信技术有限公司 | Method and system for sending cluster group short data |
Citations (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5371374A (en) * | 1990-11-26 | 1994-12-06 | Iro Ab | Optical sensor having a shielding element for preventing reception of undesirable reflected light |
US5974042A (en) * | 1997-02-28 | 1999-10-26 | Motorola, Inc. | Service detection circuit and method |
US6018528A (en) * | 1994-04-28 | 2000-01-25 | At&T Corp | System and method for optimizing spectral efficiency using time-frequency-code slicing |
US6088578A (en) * | 1998-03-26 | 2000-07-11 | Nortel Networks Corporation | Burst request method and apparatus for CDMA high speed data |
US6115390A (en) * | 1997-10-14 | 2000-09-05 | Lucent Technologies, Inc. | Bandwidth reservation and collision resolution method for multiple access communication networks where remote hosts send reservation requests to a base station for randomly chosen minislots |
US6370160B1 (en) * | 1998-12-29 | 2002-04-09 | Thomson Licensing S. A. | Base to handset epoch synchronization in multi-line wireless telephone |
US6563859B1 (en) * | 1999-03-01 | 2003-05-13 | Fujitsu Limited | Receiver and receiving method in multi-carrier spread-spectrum communications |
US6741580B1 (en) * | 1998-09-14 | 2004-05-25 | Samsung Electronics Co., Ltd. | Common channel communication device and method supporting various data rates in a mobile communication system |
US6760365B2 (en) * | 2001-10-11 | 2004-07-06 | Interdigital Technology Corporation | Acquisition circuit for low chip rate option for mobile telecommunication system |
US6804219B2 (en) * | 1999-12-29 | 2004-10-12 | Samsung Electronics, Co., Ltd. | Data transmitting method in a CDMA system |
US20050075125A1 (en) * | 2002-01-21 | 2005-04-07 | Bada Anna Marina | Method and mobile station to perform the initial cell search in time slotted systems |
US6885691B1 (en) * | 1999-08-02 | 2005-04-26 | Lg Information & Communications, Ltd. | Scrambling codes and channelization codes for multiple chip rate signals in CDMA cellular mobile radio communication system |
US6930981B2 (en) * | 2000-12-06 | 2005-08-16 | Lucent Technologies Inc. | Method for data rate selection in a wireless communication system |
US20050201319A1 (en) * | 2004-02-17 | 2005-09-15 | Samsung Electronics Co., Ltd. | Method for transmission of ACK/NACK for uplink enhancement in a TDD mobile communication system |
USRE38808E1 (en) * | 1994-12-23 | 2005-10-04 | Itt Manufacturing Enterprises, Inc. | Cellular positioning system (CPS) |
US6996162B1 (en) * | 1999-10-05 | 2006-02-07 | Texas Instruments Incorporated | Correlation using only selected chip position samples in a wireless communication system |
US7012908B2 (en) * | 2000-09-05 | 2006-03-14 | Hitachi Kokusai Electric Inc. | CDMA base transceiver system |
US7099375B2 (en) * | 2001-07-02 | 2006-08-29 | Ipwireless, Inc. | Chip rate invariant detector |
US7103310B2 (en) * | 2002-05-30 | 2006-09-05 | Nortel Networks Limited | Method of restricting the use of a radio terminal and an associated restriction device |
US7103031B2 (en) * | 2000-10-30 | 2006-09-05 | Lg Electronics Inc. | Method of transmitting/receiving broadcast message in mobile communication system |
US7123942B2 (en) * | 2001-07-25 | 2006-10-17 | Nortel Networks Limited | Radio station with closed-loop transmission diversity, and process for controlling transmission from such a station |
US7200124B2 (en) * | 2001-11-17 | 2007-04-03 | Samsung Electronics Co., Ltd. | Signal measurement apparatus and method for handover in a mobile communication system |
US20070081489A1 (en) * | 2005-10-10 | 2007-04-12 | Ipwireless, Inc. | Cellular communication system and method for coexistence of dissimilar systems |
US20070104085A1 (en) * | 2005-10-27 | 2007-05-10 | Qualcomm Incorporated | Varying scrambling/ovsf codes within a td-cdma slot to overcome jamming effect by a dominant interferer |
US7362829B2 (en) * | 2003-07-18 | 2008-04-22 | Broadcom Corporation | Multi-band single-carrier modulation |
US7400894B2 (en) * | 2002-10-28 | 2008-07-15 | Siemens Aktiengesellschaft | Method for decentralized synchronization in a self-organizing radio communication system |
US7551594B2 (en) * | 2003-09-17 | 2009-06-23 | Samsung Electronics Co., Ltd. | Method of allocating frequency subband and apparatus adopting the same |
US7672674B2 (en) * | 1988-08-04 | 2010-03-02 | Broadcom Corporation | Remote radio data communication system with data rate switching |
US8254948B2 (en) * | 2005-11-10 | 2012-08-28 | Research In Motion Limited | Method and apparatus for allocating communication resources to communicate data in a radio communication system |
US8307113B2 (en) * | 1999-11-24 | 2012-11-06 | Yen Robert C | Wireless internet access with enhanced bandwidth capabilities |
US8493859B2 (en) * | 2005-10-21 | 2013-07-23 | International Business Machines Corporation | Method and apparatus for adaptive bandwidth control with a bandwidth guarantee |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3212169B2 (en) * | 1993-01-06 | 2001-09-25 | 株式会社東芝 | Wireless communication system and base station |
US5371734A (en) * | 1993-01-29 | 1994-12-06 | Digital Ocean, Inc. | Medium access control protocol for wireless network |
JPH06276176A (en) * | 1993-03-18 | 1994-09-30 | Fujitsu Ltd | Cdma communication system |
US5600707A (en) * | 1994-08-31 | 1997-02-04 | Lucent Technologies Inc. | Wireless channel setup using low bandwidth network for selecting high bandwidth data bearer channel of another network system for data transmission |
JP3215018B2 (en) * | 1994-09-09 | 2001-10-02 | 三菱電機株式会社 | Mobile communication system |
JP2897728B2 (en) * | 1996-07-16 | 1999-05-31 | 日本電気株式会社 | Private wireless transmission method and system in wireless ATM-LAN |
DE69726697T2 (en) * | 1996-10-25 | 2004-10-21 | Nokia Corp | Radio capacity control procedure |
ATE304755T1 (en) * | 1997-05-02 | 2005-09-15 | Siemens Ag | TDMA/CDMA MESSAGE TRANSMISSION SYSTEM WITH ADJUSTABLE DATA RATE |
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 |
DE69835874T2 (en) * | 1998-07-13 | 2007-04-12 | Hewlett-Packard Development Co., L.P., Houston | Chip streams decoding |
CN1323479A (en) * | 1998-08-12 | 2001-11-21 | 艾姆迪沃西蒂公司 | Method and apparatus for network control in communications networks |
US6393012B1 (en) | 1999-01-13 | 2002-05-21 | Qualcomm Inc. | System for allocating resources in a communication system |
JP3845220B2 (en) * | 1999-02-09 | 2006-11-15 | 株式会社日立国際電気 | CDMA receiver |
JP2000286873A (en) * | 1999-03-30 | 2000-10-13 | Seiko Epson Corp | Network management system |
US7006530B2 (en) * | 2000-12-22 | 2006-02-28 | Wi-Lan, Inc. | Method and system for adaptively obtaining bandwidth allocation requests |
GB9918636D0 (en) * | 1999-08-06 | 1999-10-13 | Nokia Telecommunications Oy | Inter-system handover |
US6741577B1 (en) * | 1999-11-29 | 2004-05-25 | Koninklijke Philips Electronics N.V. | Inter-frequency handover in wireless CDMA systems |
US6721267B2 (en) * | 2000-08-01 | 2004-04-13 | Motorola, Inc. | Time and bandwidth scalable slot format for mobile data system |
US6804528B1 (en) * | 2000-11-03 | 2004-10-12 | Lucent Technologies, Inc. | Apparatus and method for use in the multicast of traffic data in wireless multiple access communications systems |
US7110431B2 (en) * | 2001-03-14 | 2006-09-19 | Mercury Computer Systems, Inc. | Hardware and software for performing computations in a short-code spread-spectrum communications system |
EP1322129A1 (en) * | 2001-12-21 | 2003-06-25 | Siemens Aktiengesellschaft | Method for network-side recognition of specific abilities of user terminals in a communication system |
GB2396275B (en) | 2002-12-09 | 2006-03-15 | Ipwireless Inc | Support of plural chip rates in a CDMA system |
-
2002
- 2002-12-09 GB GB0228613A patent/GB2396275B/en not_active Expired - Lifetime
-
2003
- 2003-12-09 KR KR1020107011692A patent/KR101061089B1/en active IP Right Grant
- 2003-12-09 CN CN201210048239.7A patent/CN102624443B/en not_active Expired - Lifetime
- 2003-12-09 CN CNA2003801054653A patent/CN1723636A/en active Pending
- 2003-12-09 KR KR1020057010249A patent/KR101004053B1/en active IP Right Grant
- 2003-12-09 AU AU2003292397A patent/AU2003292397A1/en not_active Abandoned
- 2003-12-09 EP EP03767974.3A patent/EP1574100B1/en not_active Expired - Lifetime
- 2003-12-09 JP JP2004558817A patent/JP2006509451A/en active Pending
- 2003-12-09 WO PCT/GB2003/005361 patent/WO2004054303A2/en active Application Filing
- 2003-12-09 US US10/537,195 patent/US20050281230A1/en not_active Abandoned
-
2010
- 2010-10-22 JP JP2010237474A patent/JP5601967B2/en not_active Expired - Lifetime
-
2011
- 2011-03-11 US US13/046,081 patent/US20110158221A1/en not_active Abandoned
- 2011-08-18 US US13/212,890 patent/US9094095B2/en active Active
Patent Citations (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7672674B2 (en) * | 1988-08-04 | 2010-03-02 | Broadcom Corporation | Remote radio data communication system with data rate switching |
US5371374A (en) * | 1990-11-26 | 1994-12-06 | Iro Ab | Optical sensor having a shielding element for preventing reception of undesirable reflected light |
US6018528A (en) * | 1994-04-28 | 2000-01-25 | At&T Corp | System and method for optimizing spectral efficiency using time-frequency-code slicing |
USRE38808E1 (en) * | 1994-12-23 | 2005-10-04 | Itt Manufacturing Enterprises, Inc. | Cellular positioning system (CPS) |
US5974042A (en) * | 1997-02-28 | 1999-10-26 | Motorola, Inc. | Service detection circuit and method |
US6115390A (en) * | 1997-10-14 | 2000-09-05 | Lucent Technologies, Inc. | Bandwidth reservation and collision resolution method for multiple access communication networks where remote hosts send reservation requests to a base station for randomly chosen minislots |
US6088578A (en) * | 1998-03-26 | 2000-07-11 | Nortel Networks Corporation | Burst request method and apparatus for CDMA high speed data |
US6741580B1 (en) * | 1998-09-14 | 2004-05-25 | Samsung Electronics Co., Ltd. | Common channel communication device and method supporting various data rates in a mobile communication system |
US6370160B1 (en) * | 1998-12-29 | 2002-04-09 | Thomson Licensing S. A. | Base to handset epoch synchronization in multi-line wireless telephone |
US6563859B1 (en) * | 1999-03-01 | 2003-05-13 | Fujitsu Limited | Receiver and receiving method in multi-carrier spread-spectrum communications |
US6885691B1 (en) * | 1999-08-02 | 2005-04-26 | Lg Information & Communications, Ltd. | Scrambling codes and channelization codes for multiple chip rate signals in CDMA cellular mobile radio communication system |
US6996162B1 (en) * | 1999-10-05 | 2006-02-07 | Texas Instruments Incorporated | Correlation using only selected chip position samples in a wireless communication system |
US8307113B2 (en) * | 1999-11-24 | 2012-11-06 | Yen Robert C | Wireless internet access with enhanced bandwidth capabilities |
US6804219B2 (en) * | 1999-12-29 | 2004-10-12 | Samsung Electronics, Co., Ltd. | Data transmitting method in a CDMA system |
US7012908B2 (en) * | 2000-09-05 | 2006-03-14 | Hitachi Kokusai Electric Inc. | CDMA base transceiver system |
US7103031B2 (en) * | 2000-10-30 | 2006-09-05 | Lg Electronics Inc. | Method of transmitting/receiving broadcast message in mobile communication system |
US6930981B2 (en) * | 2000-12-06 | 2005-08-16 | Lucent Technologies Inc. | Method for data rate selection in a wireless communication system |
US7099375B2 (en) * | 2001-07-02 | 2006-08-29 | Ipwireless, Inc. | Chip rate invariant detector |
US7123942B2 (en) * | 2001-07-25 | 2006-10-17 | Nortel Networks Limited | Radio station with closed-loop transmission diversity, and process for controlling transmission from such a station |
US6760365B2 (en) * | 2001-10-11 | 2004-07-06 | Interdigital Technology Corporation | Acquisition circuit for low chip rate option for mobile telecommunication system |
US7200124B2 (en) * | 2001-11-17 | 2007-04-03 | Samsung Electronics Co., Ltd. | Signal measurement apparatus and method for handover in a mobile communication system |
US20050075125A1 (en) * | 2002-01-21 | 2005-04-07 | Bada Anna Marina | Method and mobile station to perform the initial cell search in time slotted systems |
US7103310B2 (en) * | 2002-05-30 | 2006-09-05 | Nortel Networks Limited | Method of restricting the use of a radio terminal and an associated restriction device |
US7400894B2 (en) * | 2002-10-28 | 2008-07-15 | Siemens Aktiengesellschaft | Method for decentralized synchronization in a self-organizing radio communication system |
US7362829B2 (en) * | 2003-07-18 | 2008-04-22 | Broadcom Corporation | Multi-band single-carrier modulation |
US7551594B2 (en) * | 2003-09-17 | 2009-06-23 | Samsung Electronics Co., Ltd. | Method of allocating frequency subband and apparatus adopting the same |
US20050201319A1 (en) * | 2004-02-17 | 2005-09-15 | Samsung Electronics Co., Ltd. | Method for transmission of ACK/NACK for uplink enhancement in a TDD mobile communication system |
US20070081489A1 (en) * | 2005-10-10 | 2007-04-12 | Ipwireless, Inc. | Cellular communication system and method for coexistence of dissimilar systems |
US8493859B2 (en) * | 2005-10-21 | 2013-07-23 | International Business Machines Corporation | Method and apparatus for adaptive bandwidth control with a bandwidth guarantee |
US20070104085A1 (en) * | 2005-10-27 | 2007-05-10 | Qualcomm Incorporated | Varying scrambling/ovsf codes within a td-cdma slot to overcome jamming effect by a dominant interferer |
US8254948B2 (en) * | 2005-11-10 | 2012-08-28 | Research In Motion Limited | Method and apparatus for allocating communication resources to communicate data in a radio communication system |
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US20110299507A1 (en) | 2011-12-08 |
EP1574100B1 (en) | 2019-10-30 |
KR101004053B1 (en) | 2010-12-31 |
AU2003292397A1 (en) | 2004-06-30 |
JP2006509451A (en) | 2006-03-16 |
KR20050085405A (en) | 2005-08-29 |
CN102624443B (en) | 2018-01-30 |
CN102624443A (en) | 2012-08-01 |
JP5601967B2 (en) | 2014-10-08 |
AU2003292397A8 (en) | 2004-06-30 |
US9094095B2 (en) | 2015-07-28 |
GB2396275A (en) | 2004-06-16 |
US20050281230A1 (en) | 2005-12-22 |
CN1723636A (en) | 2006-01-18 |
JP2011024267A (en) | 2011-02-03 |
GB0228613D0 (en) | 2003-01-15 |
EP1574100A2 (en) | 2005-09-14 |
KR101061089B1 (en) | 2011-09-01 |
KR20100081357A (en) | 2010-07-14 |
WO2004054303A2 (en) | 2004-06-24 |
WO2004054303A3 (en) | 2005-02-10 |
GB2396275B (en) | 2006-03-15 |
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