CN104485986A - Relay communication system based on LTE - Google Patents
Relay communication system based on LTE Download PDFInfo
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- CN104485986A CN104485986A CN201410794912.0A CN201410794912A CN104485986A CN 104485986 A CN104485986 A CN 104485986A CN 201410794912 A CN201410794912 A CN 201410794912A CN 104485986 A CN104485986 A CN 104485986A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
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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
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
Abstract
The invention relates to the field of wireless communication, particularly to a relay communication system based on LTE (Long Term Evolution). The system executes the method comprising the following steps: processing a baseband signal through a first relay station, to be specific, performing decoding, analog-digital conversion and signal conversion comprising converting the digital signal to an intermediate frequency signal and converting the intermediate frequency signal to a radio frequency signal; sending the signal to a terminal which sends the baseband signal to a near-end device through the first relay station, so as to implement link return, wherein the first relay station has an encoding function and a decoding function. The first relay station has the forwarding function, so that the quality of the transmission link can be greatly improved through relaying and forwarding between the relay stations; meanwhile, channel information feedback between the relay stations is implemented and correlation of the relay stations is considered about, so as to reduce interference to synergistic transport streams, increase the signal to noise ratio of the relay stations, and improve the link capacity.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to a kind of system based on LTE trunking traffic.
Background technology
Before 10 years, 3GPP proposes the concept of LTE and starts LTE correlative study work in 3 gpp.LTE technology has the advantage of high data rate, low time delay, all-IP grouping queries and the aspect such as backward compatible, becomes the technical standard of next generation mobile communication network.Although LTE technology employs the 4G technology such as MIMO and OFDM, but it also could not meet the technical indicator required in the IMT-Advanced that International Telecommunication Union (ITU) proposes completely, for this reason, 3GPP proposes LTE-Advanced on the basis of LTE, LTE-Advanced system supports the requirement of downlink peak rates lGbit/s and upstream peak speed 500Mbit/s, its complete compatible LTE and propose several key technology to improve the performance of LTE-Advanced, even exceed the technical indicator of ITU, comprise carrier aggregation, coordinated multipoint transmission, relay transmission, the technology such as multiple antennas enhancing.
Wherein, coordinated multipoint transmission technology is by carrying out dynamic cooperative to the antenna in cell of different geographic regions, and the systematic function that the thought of active management interference improves transmitting/receiving becomes the emphasis of LTE-Advanced research.Compared with traditional mimo system, under multi-user environment, cooperation communication system utilizes the antenna can shared between multiple terminals of single antenna each other, forms a virtual MIMO structure, implementation space diversity.
Relay transmission technology is introduced in LTE-Advanced system as the network node of a kind of low-power, low cost, multiple spot sending/receiving can be carried out in System relays station simultaneously, and user terminal (UE) will be connected and communicates with setting up between multiple relay stages up-downgoing.Higher power system capacity and the larger network coverage will be brought for community, and more cheap network construction cost.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of system based on LTE trunking traffic, realizes the link passback between proximal device and terminal.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
Based on a system for LTE trunking traffic, comprising: proximal device, the first relay station and terminal; Described proximal device comprises the first encoder, the first decoder and the first baseband chip; Described first relay station comprises the second encoder, the second decoder, the second baseband chip, digital up converter, digital down converter, digital to analog converter and radio-frequency signal generator;
Described first encoder is connected with the first baseband chip, described first baseband chip is connected with the second baseband chip, described second baseband chip is connected with the second decoder, described second decoder is connected with digital up converter, described digital up converter is connected with digital to analog converter, described digital to analog converter is connected with radio-frequency signal generator, described radio-frequency signal generator is connected with terminal, described digital to analog converter is connected with digital down converter, and described second encoder is connected with the second baseband chip, the first decoder.
Beneficial effect of the present invention is: baseband signal processed by the first relay station, comprise decoding, analog-to-digital conversion, digital signal converts intermediate-freuqncy signal to and intermediate-freuqncy signal converts radiofrequency signal process to, be sent to terminal again, baseband signal is sent to proximal device by the first relay station by terminal too, realize link passback, described first relay station has codec functions.
Accompanying drawing explanation
Fig. 1 is the structural representation of the system based on LTE trunking traffic of the specific embodiment of the invention;
Fig. 2 is the block diagram of the method based on LTE trunking traffic of the specific embodiment of the invention;
Fig. 3 is the structural representation of the LTE relay system of the support multi-point cooperative transmission of the specific embodiment of the invention;
Fig. 4 is the proximal device structural representation of the specific embodiment of the invention;
Fig. 5 is the relay station structural representation of the specific embodiment of the invention;
Fig. 6 is the star net forming mode schematic diagram of the specific embodiment of the invention;
Fig. 7 is the communication link protection mode schematic diagram of the specific embodiment of the invention;
Fig. 8 is the cooperation serial networking mode schematic diagram of the specific embodiment of the invention;
Fig. 9 is the fixed relay cooperation scheme flow chart of the specific embodiment of the invention;
Label declaration:
10, proximal device; 101, the first encoder; 102, the first decoder; 103, the first baseband chip; 20, the first relay station; 201, the second encoder; 202, the second decoder; 203, the second baseband chip; 204, digital up converter; 205, digital down converter; 206, digital to analog converter; 207, radio-frequency signal generator; 30, terminal.
Embodiment
By describing technology contents of the present invention in detail, realized object and effect, accompanying drawing is coordinated to be explained below in conjunction with execution mode.
The design of most critical of the present invention is: baseband signal processed by the first relay station, comprise decoding, analog-to-digital conversion, digital signal converts intermediate-freuqncy signal to and intermediate-freuqncy signal converts radiofrequency signal process to, be sent to terminal again, baseband signal is sent to proximal device by the first relay station by terminal too, realizes link passback.
Please refer to Fig. 1, is the structural representation of the system based on LTE trunking traffic of the specific embodiment of the invention, specific as follows:
Based on a system for LTE trunking traffic, comprising: proximal device 10, first relay station 20 and terminal 30; Described proximal device 10 comprises the first encoder 101, first decoder 102 and the first baseband chip 103; Described first relay station 20 comprises the second encoder 201, second decoder 202, second baseband chip 203, digital up converter 204, digital down converter 205, digital to analog converter 206 and radio-frequency signal generator 207;
Described first encoder 101 is connected with the first baseband chip 103, described first baseband chip 103 is connected with the second baseband chip 203, described second baseband chip 203 is connected with the second decoder 202, described second decoder 202 is connected with digital up converter 204, described digital up converter 204 is connected with digital to analog converter 206, described digital to analog converter 206 is connected with radio-frequency signal generator 207, described radio-frequency signal generator 207 is connected with terminal 30, described digital to analog converter 206 is connected with digital down converter 205, described second encoder 201 and the second baseband chip 203, first decoder 102 is connected.
From foregoing description, beneficial effect of the present invention is: baseband signal processed by the first relay station, comprise decoding, analog-to-digital conversion, digital signal converts intermediate-freuqncy signal to and intermediate-freuqncy signal converts radiofrequency signal process to, be sent to terminal again, baseband signal is sent to proximal device by the first relay station by terminal too, realize link passback, described first relay station has codec functions.
Further, described first relay station 20 also comprises intermediate-frequency filter, and described intermediate-frequency filter is connected with digital to analog converter, radio-frequency signal generator.
Seen from the above description, by described intermediate-frequency filter is connected with digital to analog converter, radio-frequency signal generator, digital to analog converter gained signal is carried out filtering process by intermediate-frequency filter, obtains intermediate-freuqncy signal, be supplied to radio-frequency signal generator and produce radiofrequency signal.
Further, described first relay station 20 also comprises microwave filter, power amplifier and duplexer; Described intermediate-frequency filter is connected with microwave filter, and described microwave filter is connected with power amplifier, and described power amplifier is connected with duplexer.
Seen from the above description, the intermediate-freuqncy signal exported by intermediate-frequency filter, by sending after RF filtering, drive amplification, power amplifier, duplexer filtering process, can improve the quality of information transmission.
Further, also comprise: according to up-downgoing channel status and service feature, relay stations all in preset range are divided, form more than one Active Set, according to transmission demand, the Active Set of satisfied transmission demand is chosen from more than one Active Set, the channel total capacity of the Active Set selected by calculating, when described channel total capacity meets the capacity of transmission demand, then selects selected Active Set to transmit; There are three kinds of criteria for classifying: the first, for considering uplink channel status, is selected the up relay station that can work, form up available relay station set A 1; The second, for considering downlink channel condition, is selected the descending relay station that can work, is formed descending available relay station set A 2; The third, for considering the state of uplink and downlink channel, is selected at all workable relay station of uplink and downlink, forms comprehensive available relay station set A 3.
Seen from the above description, the capacity access thresholding of relay station is set by self adaptation, thus efficiently promptly carries out relay station selection, reduce signaling consumption, improve wireless resource utility efficiency.
Further, described first relay station 20 also comprises plural trunking and transponder; Described transponder is used for forward signal between plural trunking.
Seen from the above description, described first relay station has forwarding capability, by the relay forwarding between relay station, greatly improve the quality of transmission link, simultaneously by the feedback of channel information between relay station, consider the correlation of relay station, reduce between cooperative transmission stream and disturb, improve the signal to noise ratio of relay station, improve link capacity.
Further, form star, chain between described plural trunking or cooperate connected in series; Described Y-connection is that plural trunking is connected in parallel proximal device and terminal; Described chain connection is connected in series proximal device and terminal for plural trunking; Described cooperation is connected in series connects proximal device and terminal respectively for plural trunking, is interconnected between two between plural trunking.
Seen from the above description, expand mode by multiple networkings such as star, chain or cooperation serials, substantially increase the flexibility that relay station is disposed.
Referring to Fig. 2, is the block diagram of the method based on LTE trunking traffic of the specific embodiment of the invention, specific as follows:
Based on a method for LTE trunking traffic, comprise uplink communication and downlink communication;
Described uplink communication comprises the following steps:
Baseband signal is encoded by S100, proximal device, and encoded baseband signal is sent to the first relay station; Described proximal device is the equipment be closely connected with base station;
The baseband signal decoding received is become i/q signal by S200, the first relay station, convert described i/q signal to digital signal, convert described digital signal to intermediate-freuqncy signal, convert described intermediate-freuqncy signal to radiofrequency signal, described radiofrequency signal is sent to terminal;
S300, described terminal receive described radiofrequency signal;
Described downlink communication comprises the following steps:
Radiofrequency signal is sent to the first relay station by S400, terminal;
S500, described first relay station receive described radiofrequency signal, convert described radiofrequency signal to intermediate-freuqncy signal, convert described intermediate-freuqncy signal to digital signal, convert described digital signal to i/q signal, described i/q signal is encoded into baseband signal, encoded baseband signal is sent to proximal device;
The encoded baseband signal received is decoded by S600, proximal device.
From foregoing description, beneficial effect of the present invention is: baseband signal processed by the first relay station, comprise decoding, analog-to-digital conversion, digital signal converts intermediate-freuqncy signal to and intermediate-freuqncy signal converts radiofrequency signal process to, be sent to terminal again, baseband signal is sent to proximal device by the first relay station by terminal too, realize link passback, described first relay station has codec functions.
Further, described step S200 and S500 also comprises: baseband signal encoded, and encoded baseband signal is forwarded to the second relay station.
Seen from the above description, described first relay station has forwarding capability, by the relay forwarding between relay station, greatly improve the quality of transmission link, simultaneously by the feedback of channel information between relay station, consider the correlation of relay station, reduce between cooperative transmission stream and disturb, improve the signal to noise ratio of relay station, improve link capacity.
Further, described coding adopts relay cooperative transmission algorithm.Near-end carries out precoding to baseband signal, by near-end baseband interface unit, downgoing baseband signal is transmitted through the fiber to trunking, the uplink baseband signal that each trunking transmits is carried out solution reconciled data combined offset interference signal simultaneously.Cooperative transmission signal in baseband signal is carried out recompile by trunking, and is forwarded to next trunking by retransmission unit and relaying baseband interface unit.
Further, also comprise: according to up-downgoing channel status and service feature, relay stations all in preset range are divided, form more than one Active Set, according to transmission demand, the Active Set of satisfied transmission demand is chosen from more than one Active Set, the channel total capacity of the Active Set selected by calculating, when described channel total capacity meets the capacity of transmission demand, then selects selected Active Set to transmit; There are three kinds of criteria for classifying: the first, for considering uplink channel status, is selected the up relay station that can work, form up available relay station set A 1; The second, for considering downlink channel condition, is selected the descending relay station that can work, is formed descending available relay station set A 2; The third, for considering the state of uplink and downlink channel, is selected at all workable relay station of uplink and downlink, forms comprehensive available relay station set A 3.
Seen from the above description, the capacity access thresholding of relay station is set by self adaptation, thus efficiently promptly carries out relay station selection, reduce signaling consumption, improve wireless resource utility efficiency.
Further, described first relay station comprises plural trunking, passes through Fiber connection between described plural trunking.
Seen from the above description, Fiber connection is passed through between plural trunking, make use of Optical Fiber Transmission interference little, the feature that loss is little, ensure that the information interaction between cooperating relay has low delay, ensure effective scheduling of cooperative relay system, thus reduce interference to obtain comparatively ideal spatial multiplex gains.
Further, form star, chain between described plural trunking or cooperate connected in series; Described Y-connection is that plural trunking is connected in parallel proximal device and terminal; Described chain connection is connected in series proximal device and terminal for plural trunking; Described cooperation is connected in series connects proximal device and terminal respectively for plural trunking, is interconnected between two between plural trunking.
Seen from the above description, expand mode by multiple networkings such as star, chain or cooperation serials, substantially increase the flexibility that relay station is disposed.
Embodiment 1
A kind of LTE relay system supporting multi-point cooperative transmission involved in the present invention, as shown in Figure 3, system comprises proximal device and trunking to system architecture diagram; Wherein, proximal device is responsible for base band signal process, is deployed in base station machine room, comprises transmission unit, protocol element, near-end codec unit, near-end baseband interface unit and near-end central location, as shown in Figure 4.Proximal device primary responsibility base band signal process, for signaling process, channel estimating, controlled according to fixed relay cooperation transmission algorithm by near-end central location, precoding is carried out to baseband signal, by near-end baseband interface unit, downgoing baseband signal is transmitted through the fiber to trunking, the uplink baseband signal that each trunking transmits is carried out solution reconciled data combined offset interference signal simultaneously.
The signal that trunking is responsible between the conversion of baseband signal and radiofrequency signal and cooperative relaying forwards, and comprises relaying baseband interface unit, relaying codec unit, relaying central location, digital units, radio frequency unit and retransmission unit.As shown in Figure 5, the downgoing baseband signal that proximal device transmits by trunking carries out base band signal process by relaying baseband interface unit, relaying codec unit, downstream digital signal is become by Digital Up Convert after being demodulated to i/q signal, then descending intermediate-freuqncy signal is converted to by DAC, radiofrequency signal is become by IF filtering, frequency up-converted, then by being sent to terminal by antenna after RF filtering, drive amplification, power amplifier, duplexer filtering.The upstream radio-frequency signal that antenna receives by trunking carries out low noise amplification, RF filtering, and convert intermediate-freuqncy signal to by down-conversion and IF filtering, digital uplink signal is converted to by ADC, and become i/q signal by Digital Down Convert, be sent to proximal device by relaying baseband interface unit after carrying out base band signal process finally by relaying codec unit.Meanwhile, the fixed relay cooperation transmission algorithm that cooperative transmission signal in baseband signal provides according to relaying central location is carried out recompile by trunking, and is forwarded to next trunking by retransmission unit and relaying baseband interface unit.
Further, the LTE relay system of support multi-point cooperative transmission of the present invention, the link that optical fiber can be utilized to carry out between proximal device and trunking returns, and the relay forwarding of each cooperative relaying equipment room, carried out the feedback of channel information of relay well while greatly improving the quality of relay system transmission link by optical fiber, consider the correlation of relay station, reduce between cooperative transmission stream and disturb, improve the signal to noise ratio of relay, improve link capacity.
Further, the LTE relay system of support multi-point cooperative transmission of the present invention, each collaboration site not only will receive and dispatch the signal of this website, and other collaboration site also will be assisted to carry out relay forwarding.The fixed relay cooperation transmission algorithm that cooperative transmission signal in downgoing baseband signal provides according to relaying central location is carried out recompile by trunking, and is forwarded to next trunking by retransmission unit and relaying baseband interface unit.Meanwhile, trunking receives the upward signal of other trunkings, is sent to proximal device after carrying out encoding and decoding again by baseband interface unit, and proximal device and trunking all have joint decoding function.
Further, the LTE relay system of support multi-point cooperative transmission of the present invention, a kind of fixed relay cooperation scheme with decoding forwarding capability is provided, the capacity access thresholding of relay station is set by self adaptation, thus efficiently promptly carry out relay station selection, reduce signaling consumption, improve wireless resource utility efficiency.First, when business starts, Active Set An (the n=1 of available relay station is set according to up-downgoing channel status in all relay stations in community, service feature, 2 or 3), now, there are three kinds of choice criteria: consider that uplink channel status selects the up relay station that can work, form up available relay station set A 1; Consider that downlink channel condition selects the descending relay station that can work, form descending available relay station set A 2; Consider that the state of uplink and downlink channel is selected at all workable relay station of uplink and downlink, form comprehensive available relay station set A 3.According to broadcast sub-channels capacity threshold C in fixed velocity service determination trunk channel, determine state and the ability of each relay station, qualified relay station is selected in the Active Set An of relay station, form relay station set Tx, and calculate multiple access subchannel capacities Cx according to this set, differentiate whether each alternative relay station capacity meets the demands, if Cx >=C, represent that alternative relay station aggregate capacity meets the demands, then select current alternative relay station set, if Cx < is C, represent that alternative relay station aggregate capacity does not meet the demands, then represent that alternative relay collection cannot carry this business.
Concrete selection Relay stations activation diversity method is as follows:
Suppose there be k element in current available relay station set A n (wherein, x=l, 2 or 3), the broadcast sub-channels capacity of each relay station is respectively C1i, and wherein, natural number i is relay station sequence number, and its maximum is k, then have
wherein, B1 is the available bandwidth that source node arrives each relay station channel; P1 is the available transmit power of source node; L1i is the channel gain of source node to relay station i place; N1i be relay station i place accept noise power; All interference power sums that I1i is subject to for relay station i place; F1i inaction considers the quality of service requirement of business, relay station and network state and concludes a coefficient of generation, and requires f1i≤l.Not too high at the quality of service requirement of business, relay station is comparatively idle, and when network is not too busy, f1i can be obtained larger: higher at the quality of service requirement of business, relay station is comparatively busy, when network condition is poor, available f1i is obtained less.
If source node is to the channel capacity C1i >=C. of relay station i, then this relay station i can support this business at present, and relay station i is put under set Tx by this; If C1i<C, then this relay station i can not support this business at present, then this relay station i can not be put under set Tx; Like this, current available relay station set Tx (wherein, x=l, 2 or 3) is divided into two subclass, a class be can support all relay station set of this capacity threshold with, be called alternative relay station set, a class to support the relay station set of this capacity threshold at present.According to the alternative relay station set Tx selected, calculate alternative relay station set with in the multiple access subchannel capacities thresholding Cx that formed to destination node of all relay stations.
Further, the LTE relay system of support multi-point cooperative transmission of the present invention, Fiber connection is passed through between each cooperating relay, make use of Optical Fiber Transmission interference little, the feature that loss is little, ensure that the information interaction between cooperating relay has low delay, ensure effective scheduling of cooperative relay system, thus reduce interference to obtain comparatively ideal spatial multiplex gains.
Further, the LTE relay system of support multi-point cooperative transmission of the present invention, mode is expanded in multiple networking to support the LTE relay system of multi-point cooperative transmission to support, support star (as Fig. 6), chain (as Fig. 7), cooperation serial networking mode (as Fig. 8), substantially increase the flexibility that relay system is disposed.
In sum, a kind of system based on LTE trunking traffic provided by the invention, baseband signal is processed by the first relay station, comprise decoding, analog-to-digital conversion, digital signal converts intermediate-freuqncy signal to and intermediate-freuqncy signal converts radiofrequency signal process to, be sent to terminal again, baseband signal is sent to proximal device by the first relay station by terminal too, and realize link passback, described first relay station has codec functions.Described first relay station has forwarding capability, by the relay forwarding between relay station, greatly improve the quality of transmission link, simultaneously by the feedback of channel information between relay station, consider the correlation of relay station, reduce between cooperative transmission stream and disturb, improve the signal to noise ratio of relay station, improve link capacity.The capacity access thresholding of relay station is set by self adaptation, thus efficiently promptly carries out relay station selection, reduce signaling consumption, improve wireless resource utility efficiency.Fiber connection is passed through between plural trunking, make use of Optical Fiber Transmission interference little, the feature that loss is little, ensure that the information interaction between cooperating relay has low delay, ensure effective scheduling of cooperative relay system, thus reduce interference to obtain comparatively ideal spatial multiplex gains.Expand mode by multiple networkings such as star, chain or cooperation serials, substantially increase the flexibility that relay station is disposed.By being connected with digital to analog converter, radio-frequency signal generator by described intermediate-frequency filter, digital to analog converter gained signal being carried out filtering process by intermediate-frequency filter, obtaining intermediate-freuqncy signal, be supplied to radio-frequency signal generator and produce radiofrequency signal.The intermediate-freuqncy signal exported by intermediate-frequency filter, by sending after RF filtering, drive amplification, power amplifier, duplexer filtering process, can improve the quality of information transmission.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every equivalents utilizing specification of the present invention and accompanying drawing content to do, or be directly or indirectly used in relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. based on a system for LTE trunking traffic, it is characterized in that, comprising: proximal device, the first relay station and terminal; Described proximal device comprises the first encoder, the first decoder and the first baseband chip; Described first relay station comprises the second encoder, the second decoder, the second baseband chip, digital up converter, digital down converter, digital to analog converter and radio-frequency signal generator;
Described first encoder is connected with the first baseband chip, described first baseband chip is connected with the second baseband chip, described second baseband chip is connected with the second decoder, described second decoder is connected with digital up converter, described digital up converter is connected with digital to analog converter, described digital to analog converter is connected with radio-frequency signal generator, described radio-frequency signal generator is connected with terminal, described digital to analog converter is connected with digital down converter, and described second encoder is connected with the second baseband chip, the first decoder.
2. the system based on LTE trunking traffic according to claim 1, is characterized in that, described first relay station also comprises intermediate-frequency filter, and described intermediate-frequency filter is connected with digital to analog converter, radio-frequency signal generator.
3. the system based on LTE trunking traffic according to claim 2, is characterized in that, described first relay station also comprises microwave filter, power amplifier and duplexer; Described intermediate-frequency filter is connected with microwave filter, and described microwave filter is connected with power amplifier, and described power amplifier is connected with duplexer.
4. the system based on LTE trunking traffic according to claim 1, it is characterized in that, also comprise: according to up-downgoing channel status and service feature, relay stations all in preset range are divided, form more than one Active Set, according to transmission demand, from more than one Active Set, choose the Active Set of satisfied transmission demand, the channel total capacity of the Active Set selected by calculating, when described channel total capacity meets the capacity of transmission demand, then selected Active Set is selected to transmit; There are three kinds of criteria for classifying: the first, for considering uplink channel status, is selected the up relay station that can work, form up available relay station set A 1; The second, for considering downlink channel condition, is selected the descending relay station that can work, is formed descending available relay station set A 2; The third, for considering the state of uplink and downlink channel, is selected at all workable relay station of uplink and downlink, forms comprehensive available relay station set A 3.
5. the system based on LTE trunking traffic according to claim 1, is characterized in that, described first relay station also comprises plural trunking and transponder; Described transponder is used for forward signal between plural trunking.
6. the system based on LTE trunking traffic according to claim 5, is characterized in that, forms star, chain or cooperate connected in series between described plural trunking; Described Y-connection is that plural trunking is connected in parallel proximal device and terminal; Described chain connection is connected in series proximal device and terminal for plural trunking; Described cooperation is connected in series connects proximal device and terminal respectively for plural trunking, is interconnected between two between plural trunking.
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| CN105450270B (en) * | 2015-12-04 | 2018-10-12 | 重庆邮电大学 | A kind of selection cooperation transmission method using relay well channel |
| CN113014299A (en) * | 2019-12-19 | 2021-06-22 | 北京新岸线移动通信技术有限公司 | Wireless relay device and implementation method thereof |
| CN113014299B (en) * | 2019-12-19 | 2023-11-17 | 北京新岸线移动通信技术有限公司 | Wireless relay device and implementation method thereof |
| CN112954766A (en) * | 2021-03-08 | 2021-06-11 | 中国人民解放军军事科学院战争研究院 | Method for selecting wireless relay station |
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