CA2287457C - Repeater for radio signals - Google Patents
Repeater for radio signals Download PDFInfo
- Publication number
- CA2287457C CA2287457C CA002287457A CA2287457A CA2287457C CA 2287457 C CA2287457 C CA 2287457C CA 002287457 A CA002287457 A CA 002287457A CA 2287457 A CA2287457 A CA 2287457A CA 2287457 C CA2287457 C CA 2287457C
- Authority
- CA
- Canada
- Prior art keywords
- repeater
- base station
- mobile
- control unit
- data streams
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
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Classifications
-
- 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
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2609—Arrangements for range control, e.g. by using remote antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
Abstract
A repeater for radio signals is preferably designed for mobile use in digital cellular radio networks. The radio signals received in the down-link and/or up-link of the repeater are demodulated, and the thus obtained digital data flows are then remodulated in conformity with the prevailing norms, amplified and retransmitted. An intelligent control unit monitors the signalling traffic in the radio network and automatically tunes the frequency channels transmitted by the repeater with the channels used in the neighbouring radio cell, thus enabling a hand-over of the radio connection to a new radio cell.
Description
Repeater for Radio Signals The invention concerns a repeater for radio signals, primarily for mobile application in digital cellular radio networks.
A repeater is a type of relay station that receives the radio signals transmitted by a base station of a radio network, amplifies them, and sends them out again, so that these signals can be received by mobile stations of the radio network. Obviously, a repeater also works in the opposite direction, i.e. the radio signals transmitted by a mobile station are passed on by the repeater to a base station. In cellular radio networks, repeaters are frequently used for the purpose of extending a radio service region, e.g. for the servicing of tunnels, large buildings, mountain valleys, or the like. The use of repeaters is of particular advantage when, due to a lack of infrastructure, the line connection of a conventional base station is either impossible or possible only at a disproportionately large expense.
There are also re-peaters designed for mobile application, in particular for use on trains.
The principle upon which conventional repeaters are based is the bidirectional amplification of the radio signals in the uplink and downlink directions, in which process the radio signals are transmitted at the same frequency at which they were received. The downlink signal originating at the base station is received by means of a linking antenna, amplified and fil-tered in the downlink branch of the repeater, and sent out via a servicing antenna in the di-rection of the mobile station. At the same time, the uplink signal originating at the mobile station is received by the servicing antenna, amplified and filtered in the uplink branch of the repeater, and sent out via the linking antenna towards the base station. In applications on vehicles, as for example on high-speed trains, one must resort to using broadband repeaters, which transmit a large region of the frequencies used in the radio network, in order to en-sure proper functioning in each of the cells traveled through by the vehicle.
As a result of the broadband operation of the repeater, distortions of the signal naturally occur here (phase and amplitude errors, intermodulation, noise, and the like), which have a very disadvanta-geous effect on the quality of the radio contact.
Known from WO-A-95/24783 is a repeater for TDMA radio systems that demodulates the radio signals received in the downlink and/or uplink branches, and then remodulates accord-ing to norms, amplifies, and sends out the digital data streams so obtained.
The repeater contains a control unit, which undertakes the communication among the relevant base sta-tion, the repeater, and the mobile station to be serviced, as well an appropriate frequency assignment for the mobile station.
US-A-5 548 803 discloses a repeater that amplifies a signal received in the downlink or uplink and sends it out again on the same or another frequency. The repeater contains for this purpose a control unit that undertakes the communication among the relevant base sta-tion, the repeater, arid the mobile station to be serviced, as well as an appropriate frequency assignment for the mobile station.
The task of the invention is thus to further develop a repeater of the type specified in the introduction, in such a manner that the processed radio signals undergo the least possible toss of quality and a noise-free mobile application of the repeater is ensured.
The object of the invention is a repeater that demodulates the received signals and then newly modulates them, as well as makes a selection of the frequencies to be repeated.
The advantage of the invention consists in the fact that, during analog repeatings, unavoid-able, high-level noise does not appear and thus the quality of the radio contact is considera-bly improved. A further and essential advantage is that fact that, by means of the intelligent control unit according to the invention, a switching of the channel necessitated by a cell change is recognized, which considerably facilitates the handover procedure and makes the repeater especially suitable for application in vehicles.
The repeater according to the invention works in accordance with the following operating principle:
The received signal is filtered, amplified, and demodulated in a radio station of the radio network in question lmobile station or base stationl. Preferably, the received field strength is here measured and used as a control signal for the control of the output power of the transmitter amplifier. In the case of radio networks that operate with TDMA
(Time Division Multiple Access), the measurement of the received field strength takes place on a time slot basis. The demodulated digital data stream is fed to a modulator, amplified and again sent out.
A repeater is a type of relay station that receives the radio signals transmitted by a base station of a radio network, amplifies them, and sends them out again, so that these signals can be received by mobile stations of the radio network. Obviously, a repeater also works in the opposite direction, i.e. the radio signals transmitted by a mobile station are passed on by the repeater to a base station. In cellular radio networks, repeaters are frequently used for the purpose of extending a radio service region, e.g. for the servicing of tunnels, large buildings, mountain valleys, or the like. The use of repeaters is of particular advantage when, due to a lack of infrastructure, the line connection of a conventional base station is either impossible or possible only at a disproportionately large expense.
There are also re-peaters designed for mobile application, in particular for use on trains.
The principle upon which conventional repeaters are based is the bidirectional amplification of the radio signals in the uplink and downlink directions, in which process the radio signals are transmitted at the same frequency at which they were received. The downlink signal originating at the base station is received by means of a linking antenna, amplified and fil-tered in the downlink branch of the repeater, and sent out via a servicing antenna in the di-rection of the mobile station. At the same time, the uplink signal originating at the mobile station is received by the servicing antenna, amplified and filtered in the uplink branch of the repeater, and sent out via the linking antenna towards the base station. In applications on vehicles, as for example on high-speed trains, one must resort to using broadband repeaters, which transmit a large region of the frequencies used in the radio network, in order to en-sure proper functioning in each of the cells traveled through by the vehicle.
As a result of the broadband operation of the repeater, distortions of the signal naturally occur here (phase and amplitude errors, intermodulation, noise, and the like), which have a very disadvanta-geous effect on the quality of the radio contact.
Known from WO-A-95/24783 is a repeater for TDMA radio systems that demodulates the radio signals received in the downlink and/or uplink branches, and then remodulates accord-ing to norms, amplifies, and sends out the digital data streams so obtained.
The repeater contains a control unit, which undertakes the communication among the relevant base sta-tion, the repeater, and the mobile station to be serviced, as well an appropriate frequency assignment for the mobile station.
US-A-5 548 803 discloses a repeater that amplifies a signal received in the downlink or uplink and sends it out again on the same or another frequency. The repeater contains for this purpose a control unit that undertakes the communication among the relevant base sta-tion, the repeater, arid the mobile station to be serviced, as well as an appropriate frequency assignment for the mobile station.
The task of the invention is thus to further develop a repeater of the type specified in the introduction, in such a manner that the processed radio signals undergo the least possible toss of quality and a noise-free mobile application of the repeater is ensured.
The object of the invention is a repeater that demodulates the received signals and then newly modulates them, as well as makes a selection of the frequencies to be repeated.
The advantage of the invention consists in the fact that, during analog repeatings, unavoid-able, high-level noise does not appear and thus the quality of the radio contact is considera-bly improved. A further and essential advantage is that fact that, by means of the intelligent control unit according to the invention, a switching of the channel necessitated by a cell change is recognized, which considerably facilitates the handover procedure and makes the repeater especially suitable for application in vehicles.
The repeater according to the invention works in accordance with the following operating principle:
The received signal is filtered, amplified, and demodulated in a radio station of the radio network in question lmobile station or base stationl. Preferably, the received field strength is here measured and used as a control signal for the control of the output power of the transmitter amplifier. In the case of radio networks that operate with TDMA
(Time Division Multiple Access), the measurement of the received field strength takes place on a time slot basis. The demodulated digital data stream is fed to a modulator, amplified and again sent out.
Beyond that, with TDMA systems a system-appropriate forming of the burst edges (power ramping) is undertaken, in order to obtain the narrowest possible switching spectrum. The burst amplitude is controlled by the measured received field strength. For stabilizing the amplitude control with respect to disturbances through fading, an averaging of the received signal over several time periods can here be carried out.
Since the repeater can only operate in a channel-selective manner, in the case of application in vehicles an adaptation to the prevailing cell situation, i.e. to the frequency channels used in the cell, is required. This is achieved by the monitoring of the downlink signaling, i.e. of the signaling from the base station to the mobile station.
Achieved by means of the intelligent control unit in the repeater is the fact that the repeater must only process (receive, demodulate, and modulate) the frequencies of the strongest-received base station (radio cell) of the radio network in question, plus the frequency of the organization channel of the next-strongest neighboring cell (which must be determined by the logic of the repeater). For this purpose the intelligent control unit of the repeater must monitor the signaling traffic and extract the following information from it:
1. the list of the frequencies used in the strongest cell (serving cell), 2. the list of the organization channels of the neighboring cells, 3. according to the radio system, also information concerning the sequence of frequency-hop processes (frequency hopping) as well as their concrete course.
If the repeater is moved through a cell, then its control unit itself must be able to make the decision concerning the imminent switching into a new radio cell and to select the most suitable cell. If a cell switch (handover) is required, the repeater lowers the level of the strongest cell (serving cell) on the supplying side and raises the level of the target cell for the switch, so that the control of the radio system automatically brings about the switching of the radio contacts of the mobile stations to the new cell. As soon as the first mobile sta-tion that is serviced by the repeater has switched into the new cell, the repeater must also be able to service the frequencies of the new, stronger cell. The information concerning whether a mobile station of the repeated cell is serviced via the repeater or via direct radio contact with the base station can be determined through the temporal relationship of both directions of the radio traffic and through the power of the signal of the mobile station re-ceived by the repeater.
To each repeater branch, functional units such as channel filter, demodulator, modulator, and transmitter amplifier are, if need be, connected in parallel multiple times according to the number of the high frequency channels.
The repeater contains a frequency standard, which is appropriately synchronized by means of the synchronization channel of the downlink channel coming from the base station. This frequency standard serves as a central clock generator for generating the carrier frequency, the modulation, if need be the burst formation, etc.
By means of a data connection in the form of a radio channel between repeater and base station, which radio channel is a component of the channel used by the repeater, a remote control and monitoring of the repeater can be realized. The realization of this data connec-tion is undertaken by a structural group that has the functionality of a data-capable mobile station and is part of the intelligent control unit. This can be either directly coupled to the linking antenna or be coupled via a multiplexer/demultiplexer to the digital data streams of the two repeater branches so as to access these streams.
In the following, the invention is explained in more detail with the aid of drawings that rep-resent merely one manner of implementation. In the course of this, further features essential to the invention and advantages of the invention will become evident.
The drawings show:
Figure 1: a schematic representation of functional units of a classic repeater according to the prior art Figure 2: a schematic representation of the functional units of the repeater according to the invention A classic repeater according to Figure 1 carries out in essence a bidirectional amplification of a radio signal coming from a base station BTS or a mobile station MS in the uplink and downlink directions; the radio signals coming from the direction of the base station BTS are received by means of a linking antenna 1 and a duplex filter 3 connected downstream from this, and in the downlink repeater branch RZ 1 are amplified, possibly selected, and again sent out in the direction of the mobile station MS via an additional duplex filter 3 and a service antenna 2. The uplink repeater branch RZ 2 operates in the same way and transmits the signals coming from the mobile station MS to the base station BTS.
The repeater according to the invention according to Figure 2, on the other hand, works in a different manner. In the following, only the course of a downlink signal from the base sta-tion BTS to the mobile station MS is described, which signal passes through a first repeater branch RZ 1. The processing of the uplink signals takes place in the same manner.
The radio signal coming from the mobile station BTS is fed via a duplex filter 3 to a pream-plifier 4 and via a mixer 5 is reduced to its base frequency band or to an intermediate fre-quency. The mixing frequency is generated by a local oscillator 6. The base-band signal is conducted via a channel filter 7 to a demodulator 8. After the demodulator the demodulated, digital data stream is present. This is then appropriately processed by a modulator 9 and modulated to a carrier frequency: amplified by a transmitter amplifier 10, and, via an addi-tional duplex filter 3, is radiated by the service antenna 2 towards the mobile station.
The repeater is equipped with an intelligent control unit 12, which monitors and appropri-ately analyses the signaling traffic between the base stations and the mobile stations, as well as the prevailing received field strengths. Thus, it is possible to assign the radio contact of the mobile station with a base station to the most favorable base station in each case and to support a cell switch (handoverl. This capability predestines the repeater according to the invention for mobile applications.
The control unit 12 is appropriately equipped with a remote-control and remote-monitoring unit, which is controlled through a channel used by the repeater. The digital data stream present after the demodulator 8 is branched off, the signals relevant to the control unit be-ing filtered out by a multiplexer/demultiplexer 13.
The control unit 12 supplies a synchronization signal generated from the data stream to the frequency standard 11, which serves as a central clock generator for all of the local oscilla-tors 6. The synchronization signal is generated from the synchronization channel of the de-modulated signal.
The control unit 12 is connected via a control lead at least to the transmitter amplifier 10 of the downlink branch and controls by this means the output power of the transmitter ampli-fier 10.
Legend for Drawins~s 1 linking antenna 2 service antenna 3 duplex filter 4 preamplifier mixer 6 local oscillator 7 channel filter 8 demodulator 9 modulator transmitting amplifier 11 frequency standard 12 intelligent control unit 13 multiplexer/demultiplexer BTSbase station MS mobile station
Since the repeater can only operate in a channel-selective manner, in the case of application in vehicles an adaptation to the prevailing cell situation, i.e. to the frequency channels used in the cell, is required. This is achieved by the monitoring of the downlink signaling, i.e. of the signaling from the base station to the mobile station.
Achieved by means of the intelligent control unit in the repeater is the fact that the repeater must only process (receive, demodulate, and modulate) the frequencies of the strongest-received base station (radio cell) of the radio network in question, plus the frequency of the organization channel of the next-strongest neighboring cell (which must be determined by the logic of the repeater). For this purpose the intelligent control unit of the repeater must monitor the signaling traffic and extract the following information from it:
1. the list of the frequencies used in the strongest cell (serving cell), 2. the list of the organization channels of the neighboring cells, 3. according to the radio system, also information concerning the sequence of frequency-hop processes (frequency hopping) as well as their concrete course.
If the repeater is moved through a cell, then its control unit itself must be able to make the decision concerning the imminent switching into a new radio cell and to select the most suitable cell. If a cell switch (handover) is required, the repeater lowers the level of the strongest cell (serving cell) on the supplying side and raises the level of the target cell for the switch, so that the control of the radio system automatically brings about the switching of the radio contacts of the mobile stations to the new cell. As soon as the first mobile sta-tion that is serviced by the repeater has switched into the new cell, the repeater must also be able to service the frequencies of the new, stronger cell. The information concerning whether a mobile station of the repeated cell is serviced via the repeater or via direct radio contact with the base station can be determined through the temporal relationship of both directions of the radio traffic and through the power of the signal of the mobile station re-ceived by the repeater.
To each repeater branch, functional units such as channel filter, demodulator, modulator, and transmitter amplifier are, if need be, connected in parallel multiple times according to the number of the high frequency channels.
The repeater contains a frequency standard, which is appropriately synchronized by means of the synchronization channel of the downlink channel coming from the base station. This frequency standard serves as a central clock generator for generating the carrier frequency, the modulation, if need be the burst formation, etc.
By means of a data connection in the form of a radio channel between repeater and base station, which radio channel is a component of the channel used by the repeater, a remote control and monitoring of the repeater can be realized. The realization of this data connec-tion is undertaken by a structural group that has the functionality of a data-capable mobile station and is part of the intelligent control unit. This can be either directly coupled to the linking antenna or be coupled via a multiplexer/demultiplexer to the digital data streams of the two repeater branches so as to access these streams.
In the following, the invention is explained in more detail with the aid of drawings that rep-resent merely one manner of implementation. In the course of this, further features essential to the invention and advantages of the invention will become evident.
The drawings show:
Figure 1: a schematic representation of functional units of a classic repeater according to the prior art Figure 2: a schematic representation of the functional units of the repeater according to the invention A classic repeater according to Figure 1 carries out in essence a bidirectional amplification of a radio signal coming from a base station BTS or a mobile station MS in the uplink and downlink directions; the radio signals coming from the direction of the base station BTS are received by means of a linking antenna 1 and a duplex filter 3 connected downstream from this, and in the downlink repeater branch RZ 1 are amplified, possibly selected, and again sent out in the direction of the mobile station MS via an additional duplex filter 3 and a service antenna 2. The uplink repeater branch RZ 2 operates in the same way and transmits the signals coming from the mobile station MS to the base station BTS.
The repeater according to the invention according to Figure 2, on the other hand, works in a different manner. In the following, only the course of a downlink signal from the base sta-tion BTS to the mobile station MS is described, which signal passes through a first repeater branch RZ 1. The processing of the uplink signals takes place in the same manner.
The radio signal coming from the mobile station BTS is fed via a duplex filter 3 to a pream-plifier 4 and via a mixer 5 is reduced to its base frequency band or to an intermediate fre-quency. The mixing frequency is generated by a local oscillator 6. The base-band signal is conducted via a channel filter 7 to a demodulator 8. After the demodulator the demodulated, digital data stream is present. This is then appropriately processed by a modulator 9 and modulated to a carrier frequency: amplified by a transmitter amplifier 10, and, via an addi-tional duplex filter 3, is radiated by the service antenna 2 towards the mobile station.
The repeater is equipped with an intelligent control unit 12, which monitors and appropri-ately analyses the signaling traffic between the base stations and the mobile stations, as well as the prevailing received field strengths. Thus, it is possible to assign the radio contact of the mobile station with a base station to the most favorable base station in each case and to support a cell switch (handoverl. This capability predestines the repeater according to the invention for mobile applications.
The control unit 12 is appropriately equipped with a remote-control and remote-monitoring unit, which is controlled through a channel used by the repeater. The digital data stream present after the demodulator 8 is branched off, the signals relevant to the control unit be-ing filtered out by a multiplexer/demultiplexer 13.
The control unit 12 supplies a synchronization signal generated from the data stream to the frequency standard 11, which serves as a central clock generator for all of the local oscilla-tors 6. The synchronization signal is generated from the synchronization channel of the de-modulated signal.
The control unit 12 is connected via a control lead at least to the transmitter amplifier 10 of the downlink branch and controls by this means the output power of the transmitter ampli-fier 10.
Legend for Drawins~s 1 linking antenna 2 service antenna 3 duplex filter 4 preamplifier mixer 6 local oscillator 7 channel filter 8 demodulator 9 modulator transmitting amplifier 11 frequency standard 12 intelligent control unit 13 multiplexer/demultiplexer BTSbase station MS mobile station
Claims (33)
1. A mobile repeater for relaying radio signals between mobile stations and one of at least a first and second base station of a cellular radio network, comprising:
a tunable downlink branch for receiving and demodulating data streams from base station radio signals, and for modulating, amplifying, and retransmitting said data streams as repeater radio signals in network standard format to the mobile stations;
a tunable uplink branch for receiving and demodulating data streams from mobile station radio signals, and for modulating, amplifying and retransmitting said data streams as repeater radio signals in network standard format to the base station; and an intelligent control unit coupled to said downlink branch and said uplink branch for monitoring signaling traffic components of said data streams and for tuning said tunable downlink and uplink branches from frequency channels used for the first base station to frequency channels used for the second base station to support the handover of the relay connection from the first base station to the second base station.
a tunable downlink branch for receiving and demodulating data streams from base station radio signals, and for modulating, amplifying, and retransmitting said data streams as repeater radio signals in network standard format to the mobile stations;
a tunable uplink branch for receiving and demodulating data streams from mobile station radio signals, and for modulating, amplifying and retransmitting said data streams as repeater radio signals in network standard format to the base station; and an intelligent control unit coupled to said downlink branch and said uplink branch for monitoring signaling traffic components of said data streams and for tuning said tunable downlink and uplink branches from frequency channels used for the first base station to frequency channels used for the second base station to support the handover of the relay connection from the first base station to the second base station.
2. The mobile repeater of claim 1, wherein one of said downlink or uplink branch operates in accordance with digital cellular network standards and the other of said downlink or uplink branch operates in accordance with analog cellular network standards.
3. The mobile repeater of claim 2, wherein said intelligent control unit controls the signal output level of said repeater radio signals to force the transition of the relay connection from the first base station to the second base station.
4. The mobile repeater of claim 3, wherein output of said repeater radio signals is controlled by parameters determined as a function of the signaling traffic.
5. The mobile repeater of claim 4, wherein said downlink branch further comprises a controllable transmission amplifier, and output of said controllable transmission amplifier is determined as a function of receiving field intensity of the base station radio signals.
6. The mobile repeater of claim 5, further comprising:
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
7. The mobile repeater of claim 6, wherein:
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via said data streams.
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via said data streams.
8. The mobile repeater of claim 1, wherein said intelligent control unit controls the signal output level of said repeater radio signals to force the transition of the relay connection from the first base station to the second base station.
9. The mobile repeater of claim 8, wherein output of said repeater radio signals is controlled by parameters determined as a function of the signaling traffic.
10. The mobile repeater of claim 9, wherein said downlink branch further comprises a controllable transmission amplifier, and output of said controllable transmission amplifier is determined as a function of receiving field intensity of the base station radio signals.
11. The mobile repeater of claim 10, further comprising:
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
12. The mobile repeater of claim 11, wherein:
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
13. The mobile repeater of claim 1, wherein output of said repeater radio signals is controlled by parameters determined as a function of the signaling traffic.
14. The mobile repeater of claim 13, wherein said downlink branch further comprises a controllable transmission amplifier, and output of said controllable transmission amplifier is determined as a function of receiving field intensity of the base station radio signals.
15. The mobile repeater of claim 14, further comprising:
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
16. The mobile repeater of claim 15, wherein:
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
17. The mobile repeater of claim 1, wherein said downlink branch further comprises a controllable transmission amplifier, and output of said controllable transmission amplifier is determined as a function of receiving field intensity of the base station radio signals.
18. The mobile repeater of claim 17, further comprising:
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
19. The mobile repeater of claim 18, wherein:
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
20. The mobile repeater of claim 1, further comprising:
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
a means for generating a frequency standard for modulating said digital data stream, said frequency standard synchronized with synchronization signals emitted by the base stations.
21. The mobile repeater of claim 20, wherein:
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
22. The mobile repeater of claim 1, wherein:
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
the repeater comprises transmitting and receiving components and multiplexers/demultiplexers;
said intelligent control unit comprises a remote monitoring and remote control unit; and said remote monitoring and remote control unit uses said transmitting and receiving components and said multiplexers/demultiplexers for communication with the base station via data streams.
23. A method of transitioning a mobile repeater moving through a plurality of base stations including at least a first base station and a second base station, said method comprising:
in a downlink branch, receiving and demodulating data streams from base stations and modulating, amplifying and retransmitting the data streams in network standard format to mobile stations;
in an uplink branch, receiving and demodulating data streams from mobile stations and modulating, amplifying and retransmitting the data streams in network standard format to base stations; and in an intelligent control unit, monitoring signalling traffic components of said data streams and tuning said uplink and downlink branches from frequency channels used for the first base station to frequency channels used for the second base station to support handover of the relay connection from the first base station to the second base station.
in a downlink branch, receiving and demodulating data streams from base stations and modulating, amplifying and retransmitting the data streams in network standard format to mobile stations;
in an uplink branch, receiving and demodulating data streams from mobile stations and modulating, amplifying and retransmitting the data streams in network standard format to base stations; and in an intelligent control unit, monitoring signalling traffic components of said data streams and tuning said uplink and downlink branches from frequency channels used for the first base station to frequency channels used for the second base station to support handover of the relay connection from the first base station to the second base station.
24. A method of transitioning a mobile repeater of claim 23, comprising the additional steps of:
monitoring the repeater receiving field intensity of radio signals from at least the first and second base station;
determining when a transition from the first to the second base station is imminent; and retuning repeater frequency channels when transition is imminent from the frequencies used for the first base station to the frequencies used for the second base station.
monitoring the repeater receiving field intensity of radio signals from at least the first and second base station;
determining when a transition from the first to the second base station is imminent; and retuning repeater frequency channels when transition is imminent from the frequencies used for the first base station to the frequencies used for the second base station.
25. The method of transitioning a mobile repeater of claim 24, wherein the step of determining when a transition is imminent further comprises the steps of:
reducing the level of retransmitted radio signals to the first base station;
and increasing the level of retransmitted radio signals to the second base station.
reducing the level of retransmitted radio signals to the first base station;
and increasing the level of retransmitted radio signals to the second base station.
26. The method of transitioning a mobile repeater of claim 24, comprising the additional steps of:~~
monitoring synchronization signals emitted by the first and second base stations;
generating a frequency standard from base station synchronization signals; and modulating a data stream for transmission using said frequency standard.
monitoring synchronization signals emitted by the first and second base stations;
generating a frequency standard from base station synchronization signals; and modulating a data stream for transmission using said frequency standard.
27. The method of transitioning a mobile repeater of claim 24, wherein the step of monitoring the repeater receiving field intensity comprises the further steps of:
monitoring signaling traffic of the base stations; and extracting from the signaling traffic the frequencies used by the base stations.
monitoring signaling traffic of the base stations; and extracting from the signaling traffic the frequencies used by the base stations.
28. A method for operating a repeater as it is moved from cell to cell in a cellular radio network, comprising the steps of monitoring signaling traffic of a first base station;
determining a first set of frequency channels used by said first base station;
tuning the repeater to said first set of frequency channels;
receiving and demodulating data streams from said first base station;
modulating, amplifying, and retransmitting said data streams as repeater radio signals to mobile stations;
receiving and demodulating data streams from said mobile stations;
modulating, amplifying, and retransmitting said mobile station data streams as repeater radio signals to said first base station;
monitoring signaling traffic of at least a second base station;
determining a second set of frequency channels used by said second base station;
transitioning the repeater relay connection from said first base station to said second base station; and tuning the repeater from said first set of frequency channels to said second set.
determining a first set of frequency channels used by said first base station;
tuning the repeater to said first set of frequency channels;
receiving and demodulating data streams from said first base station;
modulating, amplifying, and retransmitting said data streams as repeater radio signals to mobile stations;
receiving and demodulating data streams from said mobile stations;
modulating, amplifying, and retransmitting said mobile station data streams as repeater radio signals to said first base station;
monitoring signaling traffic of at least a second base station;
determining a second set of frequency channels used by said second base station;
transitioning the repeater relay connection from said first base station to said second base station; and tuning the repeater from said first set of frequency channels to said second set.
29. ~The method of claim 28, wherein the step of transitioning the repeater relay connection comprises the additional step of:
controlling the signal output level of said repeater radio signals to force the transition of the repeater relay connection from said first base station to said second base station.
controlling the signal output level of said repeater radio signals to force the transition of the repeater relay connection from said first base station to said second base station.
30. ~The method of claim 28, wherein the step of monitoring signaling traffic of at least a second base station comprises the further steps of measuring the repeater receiving field intensity of said first and second base station radio signals; and determining when transition from said first base station to said second base station is required.
31. ~The method of claim 28, comprising the further step of providing a plurality of frequency standards for modulating digital data streams by synchronizing with synchronization signals of said base stations.
32. ~The method of claim 28, comprising the additional steps of editing said data streams for remote monitoring;
remotely monitoring the repeater; and remotely controlling the repeater.
remotely monitoring the repeater; and remotely controlling the repeater.
33. The method of claim 28, wherein said repeater simultaneously supports analog and digital cellular network transmissions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19649855A DE19649855B4 (en) | 1996-12-02 | 1996-12-02 | Repeater for radio signals |
| DE19649855.4 | 1996-12-02 | ||
| PCT/DE1997/002807 WO1998025421A2 (en) | 1996-12-02 | 1997-12-02 | Repeater for radio signals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2287457A1 CA2287457A1 (en) | 1998-06-11 |
| CA2287457C true CA2287457C (en) | 2006-01-10 |
Family
ID=7813341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002287457A Expired - Fee Related CA2287457C (en) | 1996-12-02 | 1997-12-02 | Repeater for radio signals |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US6459881B1 (en) |
| EP (1) | EP0943218B1 (en) |
| AT (1) | ATE254380T1 (en) |
| AU (1) | AU5477298A (en) |
| CA (1) | CA2287457C (en) |
| CZ (1) | CZ293914B6 (en) |
| DE (2) | DE19649855B4 (en) |
| HU (1) | HU224081B1 (en) |
| PL (1) | PL185824B1 (en) |
| WO (1) | WO1998025421A2 (en) |
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-
1996
- 1996-12-02 DE DE19649855A patent/DE19649855B4/en not_active Expired - Lifetime
-
1997
- 1997-12-02 CA CA002287457A patent/CA2287457C/en not_active Expired - Fee Related
- 1997-12-02 WO PCT/DE1997/002807 patent/WO1998025421A2/en active IP Right Grant
- 1997-12-02 AU AU54772/98A patent/AU5477298A/en not_active Abandoned
- 1997-12-02 EP EP97951106A patent/EP0943218B1/en not_active Expired - Lifetime
- 1997-12-02 HU HU0000385A patent/HU224081B1/en not_active IP Right Cessation
- 1997-12-02 AT AT97951106T patent/ATE254380T1/en active
- 1997-12-02 PL PL97333548A patent/PL185824B1/en unknown
- 1997-12-02 US US09/319,133 patent/US6459881B1/en not_active Expired - Lifetime
- 1997-12-02 CZ CZ19991957A patent/CZ293914B6/en not_active IP Right Cessation
- 1997-12-02 DE DE59711008T patent/DE59711008D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US6459881B1 (en) | 2002-10-01 |
| AU5477298A (en) | 1998-06-29 |
| HUP0000385A3 (en) | 2001-08-28 |
| WO1998025421A2 (en) | 1998-06-11 |
| PL185824B1 (en) | 2003-08-29 |
| ATE254380T1 (en) | 2003-11-15 |
| HUP0000385A2 (en) | 2000-06-28 |
| EP0943218A2 (en) | 1999-09-22 |
| HU224081B1 (en) | 2005-05-30 |
| EP0943218B1 (en) | 2003-11-12 |
| WO1998025421A3 (en) | 1998-11-12 |
| CA2287457A1 (en) | 1998-06-11 |
| CZ293914B6 (en) | 2004-08-18 |
| CZ195799A3 (en) | 1999-10-13 |
| DE19649855A1 (en) | 1998-06-04 |
| DE59711008D1 (en) | 2003-12-18 |
| DE19649855B4 (en) | 2004-08-05 |
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| EEER | Examination request | ||
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