WO2011036965A1 - 通信システム、中継装置、通信端末および基地局 - Google Patents

通信システム、中継装置、通信端末および基地局 Download PDF

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Publication number
WO2011036965A1
WO2011036965A1 PCT/JP2010/063808 JP2010063808W WO2011036965A1 WO 2011036965 A1 WO2011036965 A1 WO 2011036965A1 JP 2010063808 W JP2010063808 W JP 2010063808W WO 2011036965 A1 WO2011036965 A1 WO 2011036965A1
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WO
WIPO (PCT)
Prior art keywords
communication
communication terminal
base station
relay
relay device
Prior art date
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Ceased
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PCT/JP2010/063808
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English (en)
French (fr)
Japanese (ja)
Inventor
亮 澤井
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Sony Corp
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Sony Corp
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Filing date
Publication date
Priority to RU2012110184/07A priority Critical patent/RU2549199C2/ru
Priority to CN201080041237.4A priority patent/CN102511194B/zh
Priority to BR112012006061A priority patent/BR112012006061A2/pt
Priority to EP10818641.2A priority patent/EP2472983B1/en
Priority to IN2290DEN2012 priority patent/IN2012DN02290A/en
Priority to US13/496,499 priority patent/US8976725B2/en
Application filed by Sony Corp filed Critical Sony Corp
Priority to EP18193131.2A priority patent/EP3468065A1/en
Publication of WO2011036965A1 publication Critical patent/WO2011036965A1/ja
Anticipated expiration legal-status Critical
Priority to US14/612,052 priority patent/US9402222B2/en
Priority to US15/202,285 priority patent/US10063279B2/en
Priority to US16/059,579 priority patent/US10965341B2/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/36—Repeater circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • 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
    • 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
    • H04B7/15535—Control of relay amplifier gain
    • 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
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • 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
    • 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

  • the present invention relates to a communication system, a relay device, a communication terminal, and a base station.
  • relay technology In IEEE (Institut of Electric and Electronics Engineers) 802.16j, the relay technology is standardized. Also, in 3GPP (Third Generation Partnership Project) and LTE-A (Long Term Evolution Advanced), technology to use relay devices (relay stations) is actively studied to improve the throughput of communication terminals located at the cell edge. Has been.
  • This relay apparatus receives and amplifies the signal transmitted from the base station in the downlink, and transmits the amplified signal to the communication terminal.
  • the relay device can increase the signal-to-noise ratio as compared with the case where the signal is directly transmitted from the base station to the communication terminal.
  • the relay apparatus can keep the signal-to-noise ratio high by relaying the signal transmitted from the communication terminal to the base station even in the uplink.
  • Such a relay device is described in Non-Patent Documents 1 to 3, for example.
  • an object of the present invention is to provide a new and improved communication system, relay apparatus, and the like that can select a communication terminal to be relayed. It is to provide a communication terminal and a base station.
  • a plurality of base stations a plurality of communication terminals communicating with any of the plurality of base stations, and received from each of the plurality of communication terminals
  • a selection unit that selects a communication terminal to be relayed from among the plurality of communication terminals based on communication quality information, and a relay unit that relays communication between the communication terminal selected by the selection unit and a corresponding base station ,
  • a communication system comprising a relay device.
  • the relay device sets the transmission power of the relay signal to the communication terminal to be relayed to a value at which a difference between the propagation loss of the relay signal between another communication terminal and the relay device is lower than a predetermined value.
  • a setting unit may be further provided.
  • the relay device further includes a distance estimation unit that estimates a distance between the relay device and the other communication terminal based on a propagation loss of a reference signal whose transmission power received from the other communication terminal is known,
  • the power setting unit may estimate a propagation loss of the relay signal between the other communication terminal and the relay device based on the distance estimated by the distance estimation unit.
  • the selection unit may preferentially select a communication terminal having poor communication quality from the plurality of communication terminals.
  • the relay unit may transmit a relay signal to the relay target communication terminal by beam forming.
  • the difference between the transmission power of the relay signal to the base station corresponding to the communication terminal to be relayed and the propagation loss of the relay signal between the other base station and the relay device is lower than a predetermined value.
  • the relay device further includes a distance estimation unit that estimates a distance between the relay device and the other base station based on a propagation loss of a reference signal whose transmission power received from the other base station is known,
  • the power setting unit may estimate a propagation loss of the relay signal between the other base station and the relay device based on the distance estimated by the distance estimation unit.
  • the plurality of communication terminals based on communication quality information received from each of a plurality of communication terminals communicating with any of the plurality of base stations.
  • a relay device is provided that includes a selection unit that selects a communication terminal to be relayed, a communication terminal selected by the selection unit, and a relay unit that relays communication with a corresponding base station.
  • a communication terminal is received from each of a plurality of communication terminals including the communication terminal communicating with any one of a plurality of base stations.
  • the communication terminal is selected as the relay target communication terminal by the relay apparatus that selects the relay target communication terminal from among the plurality of communication terminals based on the communication quality information, the base station via the relay apparatus A communication terminal is provided for communicating with.
  • a base station is received from each of a plurality of communication terminals that communicate with any one of a plurality of base stations including the base station.
  • a communication terminal that communicates with the base station is selected as a relay target communication terminal by a relay apparatus that selects a relay target communication terminal from among the plurality of communication terminals based on communication quality information
  • the relay apparatus A base station is provided that communicates with the communication terminal via a network.
  • a communication terminal to be relayed can be appropriately selected.
  • a plurality of constituent elements having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral.
  • a plurality of configurations having substantially the same functional configuration are distinguished as communication terminals 20A, 20B, and 20C as necessary.
  • only the same reference numerals are given.
  • the communication terminal 20 when it is not necessary to distinguish between the communication terminals 20A, 20B, and 20C, they are simply referred to as the communication terminal 20.
  • FIG. 1 is an explanatory diagram showing a configuration of a communication system 1 according to an embodiment of the present invention.
  • the communication system 1 according to the embodiment of the present invention includes base stations 10A and 10B, a backbone network 12, communication terminals 20A, 20B, and 20X, and relay devices 30A and 30B. .
  • the base station 10 manages communication with the relay device 30 and the communication terminal 20 existing in the cell formed by the base station 10. For example, the base station 10A manages scheduling information for communicating with the communication terminal 20X existing in the cell, and communicates with the communication terminal 20X according to the scheduling information. Further, the base station 10A manages scheduling information for communicating with the relay device 30A existing in the cell, and scheduling information for communicating with the relay device 30A and the communication terminal 20A.
  • scheduling information is managed by the relay device 30 regardless of whether the base station 10 and the relay device 30 cooperate or the base station 10, the relay device 30, and the communication terminal 20 cooperate. May be.
  • the relay device 30 relays communication between the base station 10 and the communication terminal 20 according to scheduling information managed by the base station 10. Specifically, the relay device 30 receives the signal transmitted from the base station 10 in the downlink, and transmits the amplified signal to the communication terminal 20 using the frequency-time according to the scheduling information. . By performing such relaying, the relay device 30 can increase the signal-to-noise ratio compared to the case where the signal is directly transmitted from the base station 10 to the communication terminal 20 near the cell edge.
  • the relay device 30 can maintain a high signal-to-noise ratio in the uplink by relaying the signal transmitted from the communication terminal 20 to the base station 10 according to the scheduling information managed by the base station 10. .
  • FIG. 1 shows an example in which only the relay device 30A exists in the cell formed by the base station 10A, a plurality of relay devices 30 may exist in the cell formed by the base station 10A.
  • Type 1 and Type 2 have been proposed as types of such a relay device 30.
  • Type 1 relay device 30 has an individual cell ID and is allowed to operate its own cell. Therefore, the relay device 30 of Type 1 operates so as to be recognized as the base station 10 by the communication terminal 20. However, the relay device 30 of Type 1 does not operate completely autonomously, and the relay device 30 performs relay communication within the range of resources allocated from the base station 10.
  • the relay device 30 of Type 2 is different from Type 1 and does not have an individual cell ID.
  • the direct communication between the base station 10 and the communication terminal 20 is assisted.
  • a relay transmission technique using Cooperative relay and Network coding is being studied. Table 1 below shows the characteristics of Type 1 and Type 2 under investigation.
  • the communication terminal 20 communicates with the base station 10 directly or via the relay device 30 according to the scheduling information managed by the base station 10.
  • the data transmitted and received by the communication terminal 20 includes audio data, music data such as music, lectures, and radio programs, still image data such as photographs, documents, pictures, and charts, movies, television programs, and video programs. And moving image data such as game images.
  • the communication terminal 20 may be an information processing apparatus having a wireless communication function such as a mobile phone and a PC (Personal computer).
  • the management server 16 is connected to each base station 10 via the backbone network 12.
  • the management server 16 has a function as an MME (Mobile Management Entity).
  • the management server 16 may have a function as a leading gateway.
  • the management server 16 receives management information indicating the state of the cell formed by each base station 10 from each base station 10, and controls communication in the cell formed by each base station 10 based on this management information. Note that the functions of the management server 16 may be distributed and implemented in a plurality of physically separated configurations.
  • a communication path between the base station 10 and the relay device 30 is referred to as a relay link
  • a communication path between the relay device 30 and the communication terminal 20 is referred to as an access link
  • the communication between the base station 10 and the communication terminal 20 is performed.
  • the direct communication path is referred to as a direct link.
  • a communication path toward the base station 10 is referred to as UL (uplink)
  • a communication path toward the communication terminal 20 is referred to as DL (downlink).
  • Communication in each link is performed based on OFDMA.
  • the relay device 30 separates the relay link and the access link by frequency or time in order to prevent interference between the relay link and the access link.
  • the relay device 30 may separate the relay link and the access link in the same direction by TDD (Time Division Duplexing) using a common frequency.
  • TDD Time Division Duplexing
  • FIG. 2 is an explanatory diagram showing an example of resource allocation when the same frequency is used for UL and DL.
  • one radio frame is composed of subframes 0 to 9.
  • the relay device 30 recognizes the subframes 8 and 9 as resources for the DL of the access link according to the instruction from the base station 10, and determines the signal transmitted from the base station 10. Relay to communication terminal 20 in subframes 8 and 9.
  • PSC Primary Synchronization Channel
  • SSC Secondary Synchronization Channel
  • PBCH Physical Broadcast Channel
  • FIG. 3 is an explanatory diagram showing an example of resource allocation when different frequencies are used for UL and DL.
  • frequency f0 is used for DL
  • frequency f1 is used for UL.
  • the relay device 30 recognizes the subframe 6-8 having the frequency f0 as a resource for the DL of the access link in accordance with an instruction from the base station 10, and is transmitted from the base station 10. The received signal is relayed to the communication terminal 20 using the subframe 6-8 having the frequency f0.
  • PSC and SSC which are downlink synchronization signals, are assigned to subframe 0 and subframe 5 of frequency f0 (for DL), and paging channels are assigned to subframe 4 and subframe 9.
  • FIG. 4 is an explanatory diagram showing a format example of a DL radio frame.
  • the DL radio frame is composed of subframes 0 to 9, each subframe is composed of two 0.5 ms slots, and each 0.5 ms slot is composed of 7 OFDM (Orthogonal Frequency Division Multiplexing) symbols.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the first 1 to 3 OFDM symbols of each subframe include PCFICH (Physical Control Format Channel), PHICH (Physical Hybrid ARQ Indicator Channel), and PDCCH (Physical Control).
  • PCFICH Physical Control Format Channel
  • PHICH Physical Hybrid ARQ Indicator Channel
  • PDCCH Physical Control
  • each said channel contains the information shown below as an example.
  • PCFICH Number of PDCCH symbols for layer 1 and layer 2
  • PHICH ACK / NACK for PUSCH
  • PDCCH Downlink control information.
  • PDSCH / PUSCH scheduling information (modulation method, coding rate, etc. format)
  • one resource block (1RB) which is the minimum unit for resource allocation, is composed of 6 or 7 OFDM symbols and 12 subcarriers.
  • a demodulation reference (reference signal) is arranged in a part of the resource block.
  • SSC, PBCH, and PSC are arranged in subframes 0 and 5.
  • wireless frame shown in FIG. 4 is utilized as PDSCH (Physical Downlink Shared Channel).
  • FIG. 5 is an explanatory diagram showing a format example of a UL radio frame. Similar to the DL radio frame, the UL radio frame is composed of subframes 0 to 9, each subframe is composed of two 0.5 ms slots, and each 0.5 ms slot is composed of 7 OFDM symbols.
  • a demodulation reference (reference signal) is arranged in each 0.5 ms slot, and CQI measurement references are arranged in a distributed manner.
  • the receiving-side base station 10 or the relay device 30 performs channel estimation using the demodulation reference, and demodulates the received signal according to the channel estimation result. Further, the receiving-side base station 10 or the relay device 30 acquires the CQI between the transmitting-side relay device 30 and the communication terminal 20 by measuring the CQI measurement reference.
  • the empty part in the radio frame shown in FIG. 5 is used as a PUSCH (Pysical Uplink Shared Channel).
  • PUSCH Physical Uplink Shared Channel
  • FIG. 6 is an explanatory diagram showing a connection processing sequence.
  • the relay device 30 or the communication terminal 20 transmits a RACH (Random Access Channel) preamble to the base station 10 (S62).
  • the base station 10 acquires TA (Timing Advance) information, and transmits the TA information together with the assigned resource information to the relay device 30 or the communication terminal 20 (S64).
  • the base station 10 may acquire the difference between the transmission timing and the reception timing of the RACH preamble as TA information.
  • the relay device 30 or the communication terminal 20 transmits an RRC connection request (RRC connection request) to the base station 10 using the resource indicated by the allocated resource information (S66).
  • RRC connection request the RRC connection request
  • the base station 10 transmits an RRC connection resolution indicating the transmission source of the RRC connection request (S68).
  • the relay apparatus 30 or the communication terminal 20 can confirm whether the base station 10 received the RRC connection request.
  • the base station 10 transmits a connection request indicating that the relay device 30 or the communication terminal 20 is requesting a service to the management server 16 having a function as an MME (S70).
  • the management server 16 transmits information for setting the relay device 30 or the communication terminal 20 using the connection setup (S72).
  • the base station 10 transmits the RRC connection setup to the relay device 30 or the communication terminal 20 based on the connection setup from the management server 16 (S74), and the relay device 30 or the communication terminal 20 performs connection setting. Thereafter, the relay device 30 or the communication terminal 20 transmits an RRC connection complete indicating that the connection setting is completed to the base station 10 (S76).
  • connection processing sequence is merely an example, and the relay device 30 or the communication terminal 20 and the base station 10 may be connected by another sequence.
  • MBSFN Multi-Media Broadcasting Single Frequency Network
  • MBSFN is a mode in which a plurality of base stations 10 simultaneously broadcast data at the same frequency. Therefore, according to MBSFN, the relay device 30 of Type 1 that virtually operates as a base station transmits a DL control channel and the like using the same frequency as the base station 10.
  • the relay device 30 of Type 1 that virtually operates as a base station transmits a DL control channel and the like using the same frequency as the base station 10.
  • FIG. 7 is an explanatory diagram showing a specific example of MBSFN transmission / reception processing.
  • the base station 10 and the relay device 30 simultaneously transmit the PDCCH.
  • the base station 10 transmits an R-PDCCH for controlling relay in addition to the PDSCH for the communication terminal 20 after the PDCCH.
  • R-PDCCH After this R-PDCCH, PDSCH (data to be relayed) to relay device 30 is transmitted.
  • a non-transmission section is provided after PDSCH for relay device 30.
  • the relay device 30 After transmitting the PDCCH, the relay device 30 receives the PDSCH (relay target data) from the base station 10 through the switching section to the reception process. Then, the relay device 30 switches the reception process to the transmission process in the non-transmission section provided after the PDSCH (data to be relayed) from the base station 10. Further, in the next step, the relay device 30 adds the PDCCH to the decoded PDSCH (data to be relayed) and relays it to the communication terminal 20.
  • the PDSCH display target data
  • the relay device 30 switches the reception process to the transmission process in the non-transmission section provided after the PDSCH (data to be relayed) from the base station 10. Further, in the next step, the relay device 30 adds the PDCCH to the decoded PDSCH (data to be relayed) and relays it to the communication terminal 20.
  • FIG. 8 is an explanatory diagram showing an example of frequency allocation in each cell.
  • frequency interference at the cell boundary can be suppressed by assigning frequencies f1 to f3 to each sector as shown in FIG.
  • Such allocation is particularly effective in densely populated areas with high traffic.
  • LTE-A various new technologies such as Spectrum aggregation, network MIMO, Uplink multi-user MIMO, and relay technology are being studied in order to achieve high throughput with End to End. For this reason, with the advent of new high-throughput mobile applications, depletion of frequency resources may become a problem even in the suburbs. Moreover, when LTE-A is introduced, there is a high possibility that introduction of the relay device 30 will be activated for the purpose of realizing infrastructure deployment at a low cost.
  • FIG. 9 is an explanatory diagram showing a DL interference model of interest in the present embodiment.
  • the relay device 30 ⁇ / b> A exists at a position where PDCCH can be received from a plurality of base stations 10 (base stations 10 ⁇ / b> A and 10 ⁇ / b> B) and belongs to each of the plurality of base stations 10.
  • the terminal 20 communication terminals 20A and 20B
  • the terminal 20 exists at a position where signals can be received.
  • the relay device 30A can relay both the communication between the base station 10A and the communication terminal 20A and the communication between the base station 10B and the communication terminal 20B.
  • the relay device 30A relays the signal transmitted from the base station 10A to the communication terminal 20A without any special contrivance, the signal transmitted by the relay, the signal transmitted from the base station 10B, May interfere with the communication terminal 20B.
  • FIG. 10 is an explanatory diagram showing a UL interference model of interest in the present embodiment.
  • the relay device 30 ⁇ / b> A exists at a position where PDCCH can be received from a plurality of base stations 10 (base stations 10 ⁇ / b> A and 10 ⁇ / b> B), and the communication terminals 20 belonging to each of the plurality of base stations 10. It exists in a position where signals can be received from (communication terminals 20A and 20B).
  • the relay device 30A can relay both the communication between the base station 10A and the communication terminal 20A and the communication between the base station 10B and the communication terminal 20B.
  • the relay device 30A relays the signal transmitted from the communication terminal 20A to the base station 10A without any special contrivance, the signal transmitted by the relay and the signal transmitted from the communication terminal 20B are obtained. There is a concern that interference may occur in the base station 10B.
  • the relay device 30 according to the present embodiment has been made paying attention to the above-described background, and according to the relay device 30, the communication to be relayed is appropriately selected, and the occurrence of interference due to the relay is suppressed. be able to.
  • the configuration of the relay device 30 according to the present embodiment will be described together with the configuration of the communication terminal 20.
  • FIG. 11 is a functional block diagram showing the configuration of the communication terminal 20.
  • the communication terminal 20 includes a plurality of antennas 220a to 220n, an analog processing unit 224, an AD / DA conversion unit 228, and a digital processing unit 230.
  • Each of the plurality of antennas 220a to 220n receives a radio signal from the base station 10 or the relay device 30, acquires an electrical high-frequency signal, and supplies the high-frequency signal to the analog processing unit 224. Further, each of the plurality of antennas 220a to 220n transmits a radio signal to the base station 10 or the relay device 30 based on the high frequency signal supplied from the analog processing unit 224. Since the communication terminal 20 includes the plurality of antennas 220a to 220n as described above, it can perform MIMO (Multiple Input Multiple Output) communication or diversity communication.
  • MIMO Multiple Input Multiple Output
  • the analog processing unit 224 converts the high-frequency signals supplied from the plurality of antennas 220a to 220n into baseband signals by performing analog processing such as amplification, filtering, and down-conversion.
  • the analog processing unit 224 converts the baseband signal supplied from the AD / DA conversion unit 228 into a high frequency signal.
  • the AD / DA conversion unit 228 converts the analog baseband signal supplied from the analog processing unit 224 into a digital format and supplies the digital format to the digital processing unit 230.
  • the AD / DA conversion unit 228 converts the digital baseband signal supplied from the digital processing unit 230 into an analog format and supplies the analog baseband signal to the analog processing unit 224.
  • the digital processing unit 230 includes a synchronization unit 232, a decoder 234, an encoder 240, and a control unit 242.
  • the synchronization unit 232, the decoder 234, the encoder 240, and the like, together with the plurality of antennas 220a to 220n, the analog processing unit 224, and the AD / DA conversion unit 228, communicate with the base station 10 and the relay device 30. It functions as a part.
  • the synchronization unit 232 is supplied with synchronization signals such as PSC and SSC transmitted from the base station 10 and the relay device 30 from the AD / DA conversion unit 228, and performs synchronization processing of radio frames based on the synchronization signals. Specifically, the synchronization unit 232 calculates the correlation between the synchronization signal and a known sequence pattern, and synchronizes the radio frames by detecting the peak position of the correlation.
  • synchronization signals such as PSC and SSC transmitted from the base station 10 and the relay device 30 from the AD / DA conversion unit 228, and performs synchronization processing of radio frames based on the synchronization signals. Specifically, the synchronization unit 232 calculates the correlation between the synchronization signal and a known sequence pattern, and synchronizes the radio frames by detecting the peak position of the correlation.
  • the decoder 234 decodes the baseband signal supplied from the AD / DA converter 228 to obtain received data.
  • the decoding may include, for example, MIMO reception processing and OFDM demodulation processing.
  • Encoder 240 encodes transmission data such as PUSCH and supplies the encoded data to AD / DA converter 228.
  • the encoding may include, for example, a MIMO transmission process and an OFDM modulation process.
  • the control unit 242 controls overall operations in the communication terminal 20 such as transmission processing, reception processing, and connection processing with the relay device 30 and the base station 10.
  • the communication terminal 20 performs transmission processing and reception processing using resource blocks allocated by the base station 10 based on control by the control unit 242.
  • the control unit 242 controls the transmission process according to the transmission parameter specified from the base station 10 or the relay device 30.
  • the control unit 242 controls transmission processing according to the TPC parameter designated by the base station 10.
  • the digital processing unit 230 uses the demodulation reference transmitted from the base station 10 or the relay device 30 to perform channel quality. (For example, received power) is measured.
  • the control unit 242 generates a CQI report based on the measurement result, and supplies the generated CQI report to the encoder 240. As a result, the CQI report is transmitted to the base station 10 or the relay device 30 using PUSCH.
  • FIG. 12 is a functional block diagram showing the configuration of the relay device 30.
  • the relay device 30 includes a plurality of antennas 320a to 320n, an analog processing unit 324, an AD / DA conversion unit 328, and a digital processing unit 330.
  • Each of the plurality of antennas 320a to 320n receives a radio signal from the base station 10 or the communication terminal 20, acquires an electrical high-frequency signal, and supplies the high-frequency signal to the analog processing unit 324.
  • Each of the plurality of antennas 320a to 320n transmits a radio signal to the base station 10 or the communication terminal 20 based on the high frequency signal supplied from the analog processing unit 324. Since the relay device 30 includes the plurality of antennas 320a to 320n as described above, it is possible to perform MIMO communication and diversity communication.
  • the analog processing unit 324 converts high-frequency signals supplied from the plurality of antennas 320a to 320n into baseband signals by performing analog processing such as amplification, filtering, and down-conversion.
  • the analog processing unit 324 converts the baseband signal supplied from the AD / DA conversion unit 328 into a high frequency signal.
  • the AD / DA conversion unit 328 converts the analog baseband signal supplied from the analog processing unit 324 into a digital format and supplies the digital format to the digital processing unit 330.
  • the AD / DA conversion unit 328 converts the digital baseband signal supplied from the digital processing unit 330 into an analog format and supplies the analog baseband signal to the analog processing unit 324.
  • the digital processing unit 330 includes a synchronization unit 332, a decoder 334, a buffer 338, an encoder 340, a control unit 342, a relay selection unit 344, a distance estimation unit 346, and a power setting unit 348.
  • the synchronization unit 332, the decoder 334, the encoder 340, etc. together with the plurality of antennas 320a to 320n, the analog processing unit 324, and the AD / DA conversion unit 328, receive for communication with the base station 10 and the communication terminal 20. Functions as a transmission unit, a transmission unit, and a relay unit.
  • the synchronization unit 332 is supplied with the synchronization signal transmitted from the base station 10 from the AD / DA conversion unit 328, and performs synchronization processing of the radio frame based on the synchronization signal. Specifically, the synchronization unit 332 calculates the correlation between the synchronization signal and the known sequence pattern, and synchronizes the radio frames by detecting the correlation peak position.
  • the decoder 334 decodes the baseband signal supplied from the AD / DA converter 328 to obtain relay data addressed to the base station 10 or the communication terminal 20.
  • Decoding may include, for example, MIMO reception processing, OFDM demodulation processing, error correction processing, and the like.
  • the buffer 338 temporarily holds the relay data addressed to the base station 10 or the communication terminal 20 obtained by the decoder 334. Under the control of the control unit 342, relay data addressed to the communication terminal 20 is read from the buffer 338 to the encoder 340 in the DL resource block of the access link. Similarly, under the control of the control unit 342, relay data addressed to the base station 10 is read from the buffer 338 to the encoder 340 in the UL resource block of the relay link.
  • Encoder 340 encodes relay data supplied from buffer 338 and supplies the encoded data to AD / DA converter 328.
  • the encoding may include, for example, a MIMO transmission process and an OFDM modulation process.
  • the relay selection unit 344 selects one or all of the communications as relay target communications. For example, the relay selection unit 344 of the relay device 30A illustrated in FIG. 9 selects which of the communication between the base station 10A and the communication terminal 20A or the communication between the base station 10B and the communication terminal 20B is to be relayed.
  • the selection criteria by the relay selection unit 344 will be specifically described.
  • relay selection unit 344 acquires UL scheduling information directed to each base station 10 from PDCCH.
  • relay device 30A can receive PUSCH from both communication terminals 20A and 20B, relay selection unit 344 acquires a CQI report from PUSCH. Note that the relay selection unit 344 can determine from which communication terminal 20 each PUSCH is transmitted based on the UL scheduling information.
  • the relay selection part 344 selects the communication to relay based on the acquired CQI report (communication quality information).
  • the relay selection unit 344 may preferentially select direct link communication with poor communication quality in each of UL and DL.
  • the relay selection unit 344 DL communication from 10A to communication terminal 20A may be selected. That is, when “CQI_level_communication terminal 20A ⁇ CQI_level_communication terminal 20B”, relay selection unit 344 may select DL communication from base station 10A to communication terminal 20A as a relay target.
  • the relay selection unit 344 performs communication.
  • UL communication from the terminal 20A to the base station 10A may be selected. That is, when “CQI_level_communication terminal 20A ⁇ CQI_level_communication terminal 20B”, relay selection unit 344 may select UL communication from communication terminal 20A to base station 10A as a relay target.
  • the relay selection part 344 judges communication with bad communication quality based on a CQI report was demonstrated above, this embodiment is not limited to this example.
  • the TPC parameter specified by the base station 10 to the communication terminal 20 varies depending on the state of the direct link between the base station 10 and the communication terminal 20, it can be regarded as an index indicating the direct link communication quality. Therefore, based on the TPC parameter specified by the base station 10 to the communication terminal 20 by the PDCCH, the relay selection unit 344 selects, as a relay target, more preferentially for communication performed with a high output signal. May be.
  • the distance estimation unit 346 estimates the distance to each base station 10 existing within the communicable range and the distance to each communication terminal 20. For example, the distance estimation unit 346 of the relay device 30A illustrated in FIG. 9 estimates the distance to the base station 10A, the distance to the base station 10B, the distance to the communication terminal 20A, and the distance to the communication terminal 20B.
  • the distance estimation unit 346 performs distance estimation based on the propagation loss of the reference signal transmitted by each base station 10 and each communication terminal 20 and having known transmission power and phase. For example, the distance estimation unit 346 may calculate the propagation loss of the reference signal (demodulation reference) transmitted from the communication terminal 20A, and estimate the distance to the communication terminal 20A based on the calculated propagation loss. Similarly, the distance estimation unit 346 may calculate the propagation loss of the reference signal transmitted from the base station 10B, and estimate the distance from the base station 10B based on the calculated propagation loss.
  • the reference signal demodulation reference
  • the power setting unit 348 sets transmission power for performing the relay selected by the relay selection unit 344.
  • transmission power set by the power setting unit 348 when the relay target is DL communication and UL communication will be described.
  • the relay selection unit 344 selects DL communication from the base station 10A to the communication terminal 20A as a relay target
  • the signal transmitted by the relay device 30A to the communication terminal 20A for relaying is: It is received as a noise component in communication terminal 20B. Further, if this noise component exceeds the allowable interference level of the communication terminal 20B, interference may occur. For this reason, the power setting unit 348 sets the transmission power of the signal to the communication terminal 20A so that no interference occurs in the communication terminal 20B. Specifically, the power setting unit 348 may set the transmission power so that the QoS expected by the base station 10A / communication terminal 20A is satisfied and the following Equation 1 is satisfied.
  • the interference tolerance level of the communication terminal 20B may be a required SINR at the minimum rate of the communication terminal 20B indicated by the device authentication authority.
  • the power setting unit 348 can estimate the propagation loss between the relay device 30A and the communication terminal 20B based on the distance between the relay device 30A and the communication terminal 20B estimated by the distance estimation unit 346. Note that the power setting unit 348 may set the lowest transmission power within the range satisfying the QoS expected by the base station 10A / communication terminal 20A and satisfying the above formula 1, from the viewpoint of reducing power consumption. .
  • the relay device 30 may not perform relaying.
  • the relay apparatus 30 may reallocate resource blocks so that interference does not occur.
  • a signal that the relay device 30A transmits to the base station 10A for relaying is: It is received as a noise component in the base station 10B. Further, if this noise component exceeds the interference allowable level of the base station 10B, interference may occur. For this reason, the power setting unit 348 sets the transmission power of the signal to the base station 10A so that no interference occurs in the base station 10B. Specifically, the power setting unit 348 may set the transmission power so as to satisfy QoS expected by the base station 10A / communication terminal 20A and satisfy the following formula 2.
  • the allowable interference level of the base station 10B may be a required SINR at the minimum rate of the base station 10B indicated by the device authentication authority.
  • the power setting unit 348 can estimate the propagation loss between the relay device 30A and the base station 10B based on the distance between the relay device 30A and the base station 10B estimated by the distance estimation unit 346. Note that the power setting unit 348 may set the lowest transmission power within a range satisfying the QoS expected by the base station 10A / communication terminal 20A and satisfying the above formula 2 from the viewpoint of power consumption reduction. .
  • the relay device 30 may not perform relaying.
  • the relay apparatus 30 may reallocate resource blocks so that interference does not occur.
  • the control unit 342 controls transmission processing so that a signal for relaying is transmitted to the base station 10 or the communication terminal 20 selected by the relay selection unit 344 with the transmission power set by the power setting unit 348. Further, the control unit 342 may control transmission parameters such as an AMC (Advanced Modulation and Coding) parameter and a HARQ (Hybrid Automatic Repeat Request) parameter as follows when controlling the transmission process. In addition, the following control may be performed independently or may be performed in combination.
  • AMC Advanced Modulation and Coding
  • HARQ Hybrid Automatic Repeat Request
  • the relay destination communication terminal 20 and the relay device 30 have a positional relationship in which the signal reception level from the relay device 30 may be sufficiently higher than the reception level from the direct link in the communication terminal 20.
  • the control unit 342 may overlay transmit the relay signal with a Modulation-Coding parameter having a higher rate than that of the direct link.
  • the signal transmitted through the direct link is buried when received by the communication terminal 20, but the relay signal from the relay device 30 is expected to be decoded by the communication terminal 20.
  • the relay device 30 may transmit a relay signal using a modulation-coding parameter having a higher rate than that of the direct link by using an empty time slot.
  • the control unit 342 may overlay transmit the relay signal with the same parameter as the retransmission packet.
  • the relay device 30 may transmit a relay signal as a HARQ packet at a higher rate than the direct link by using an empty time slot.
  • the control unit 342 may transmit the relay signal by beam forming when the relative direction of the relay destination communication terminal 20 can be estimated.
  • the power setting unit 348 may set the transmission power based on the transmission power and propagation loss of the null beam communication terminal 20 that is not the relay destination. According to this beam forming, it is possible to select a plurality of communication terminals 20 as relay destinations and transmit relay signals to the plurality of communication terminals 20 simultaneously.
  • the relay destination base station 10 and the relay device 30 have a positional relationship in which the signal reception level from the relay device 30 may be sufficiently higher than the reception level from the direct link in the base station 10.
  • the control unit 342 may overlay transmit the relay signal with a Modulation-Coding parameter having a higher rate than that of the direct link.
  • the signal transmitted through the direct link is buried when received by the base station 10, but it is expected that the relay signal from the relay device 30 is decoded by the base station 10.
  • the relay device 30 may transmit a relay signal using a modulation-coding parameter having a higher rate than that of the direct link by using an empty time slot.
  • the control unit 342 may overlay transmit the relay signal with the same parameter as the retransmission packet.
  • the relay device 30 may transmit a relay signal as a HARQ packet at a higher rate than the direct link by using an empty time slot.
  • the control unit 342 may transmit the relay signal by beamforming.
  • the power setting unit 348 may set the transmission power based on the transmission power and propagation loss of the Null beam to the base station 10 that is not the relay destination. According to this beam forming, it becomes possible to select a plurality of base stations 10 as relay destinations and transmit relay signals to the plurality of base stations 10 simultaneously.
  • the relay device 30 uses the direct link and completes the procedure up to the RRC connection complete in the same procedure as that of the communication terminal 20, and determines the subcell ID, reference pattern allocation, and the like.
  • the base station 10 and the subordinate relay device 30 are synchronized.
  • Grouping information indicating the relay device 30 and the communication terminal 20 belonging to the relay device 30 is given in advance by the base station 10 (the base station 10 determines the necessity of relay from the CQI report and TA information and Allocate resources for relay).
  • Ptx_DL >> Ptx_RL and Ptx_DL >> Ptx_AL (Ptx: maximum transmission power)
  • DL direct link (direct link between the base station 10 and the communication terminal 20)
  • AL access link
  • RL relay link / direct link
  • Measures against interference in particular, measures against interference on the direct link of a communication device (LTE UE) that does not assume the presence of the relay device 30 are important issues.
  • FIG. 13 is a sequence diagram illustrating a flow in which the relay device 30 relays DL communication. As illustrated in FIG. 13, the relay device 30 receives PDCCH from the base station 10A (S404), and receives PDCCH from the base station 10B (S408), and acquires scheduling information from each PDCCH (S412).
  • the relay device 30 receives the demodulation reference from the communication terminal 20A (S416), and receives the demodulation reference from the communication terminal 20B (S420). Based on the propagation loss of each demodulation reference, the communication terminal 20A And the distance to the communication terminal 20B are estimated (S424). Note that it is possible to determine from which communication terminal 20 each demodulation reference is transmitted based on the scheduling information acquired in S412.
  • the relay selection unit 344 When the CQI report is received from the communication terminal 20A (S428) and the CQI report is received from the communication terminal 20B (S432), the relay selection unit 344 performs communication with the communication terminal 20A or communication with the communication terminal 20B. Which one is to be relayed is selected based on the communication quality indicated by the CQI report (S436). For example, the relay selection unit 344 may preferentially select communication with poor communication quality.
  • the power setting unit 348 sets the transmission power of the signal to the communication terminal 20 selected in S436 such that the reception level at the other communication terminal 20 is equal to or lower than the allowable interference level of the other communication terminal 20 ( S440).
  • the relay device 30 receives the PDSCH from the base station 10A (S444)
  • the relay device 30 transmits the received PDSCH to the communication terminal 20A with the transmission power set by the power setting unit 348. Transmit (S448).
  • the relay device 30 may appropriately control parameters such as AMC and HARQ and transmit the PDSCH to the communication terminal 20A.
  • FIG. 14 is a sequence diagram illustrating a flow in which the relay device 30 relays UL communication.
  • the relay device 30 receives the PDCCH from the base station 10A (S454), and receives the PDCCH from the base station 10B (S458), acquires scheduling information from each PDCCH (S462).
  • the relay device 30 receives the reference signal from the base station 10A (S466), and receives the reference signal from the base station 10B (S470), the distance from the base station 10A based on the propagation loss of each reference signal. And the distance to the base station 10B are estimated (S474).
  • the relay selection unit 344 When the CQI report is received from the communication terminal 20A (S478) and the CQI report is received from the communication terminal 20B (S482), the relay selection unit 344 performs communication with the base station 10A or communication with the base station 10B. Which one to relay is selected based on the communication quality indicated by the CQI report (S486). For example, the relay selection unit 344 may preferentially select communication with poor communication quality.
  • the power setting unit 348 sets the transmission power of the signal to the base station 10 selected in S486 so that the reception level at the other base station 10 is equal to or lower than the allowable interference level of the other base station 10 ( S490).
  • the relay device 30 receives the PUSCH from the communication terminal 20A (S494), and sends the received PUSCH to the base station 10A with the transmission power set by the power setting unit 348. Transmit (S498).
  • the relay device 30 may appropriately control parameters such as AMC and HARQ and transmit the PDSCH to the communication terminal 20A.
  • the relay device 30 according to the present embodiment can appropriately select communication to be relayed when there are a plurality of base stations 10 and communication terminals 20 in the communicable range. Furthermore, the relay device 30 according to the present embodiment can transmit the relay signal with transmission power that does not cause interference in the base station 10 or the communication terminal 20 that is not the relay destination.
  • each step in the processing of the communication system 1 of the present specification does not necessarily have to be processed in time series in the order described as a sequence diagram.
  • Each step in the processing of the communication system 1 may be processed in an order different from the order described as the sequence diagram or may be processed in parallel.
  • S404 and S408 in FIG. 13 may be simultaneously received by the relay device 30, or one of them may be first.

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PCT/JP2010/063808 2009-09-25 2010-08-16 通信システム、中継装置、通信端末および基地局 Ceased WO2011036965A1 (ja)

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EP18193131.2A EP3468065A1 (en) 2009-09-25 2010-08-16 Relay device and method
CN201080041237.4A CN102511194B (zh) 2009-09-25 2010-08-16 通信系统、中继装置、通信终端和基站
BR112012006061A BR112012006061A2 (pt) 2009-09-25 2010-08-16 sistema de comunicação, dispositivo de retransmissão, terminal de comunicação, e, estação base
EP10818641.2A EP2472983B1 (en) 2009-09-25 2010-08-16 Communication system, relay device, communication terminal, and base station
IN2290DEN2012 IN2012DN02290A (enExample) 2009-09-25 2010-08-16
RU2012110184/07A RU2549199C2 (ru) 2009-09-25 2010-08-16 Система связи, ретранслирующее устройство, терминал связи и базовая станция
US13/496,499 US8976725B2 (en) 2009-09-25 2010-08-16 Communication system, relay device, communication terminal, and base station
US14/612,052 US9402222B2 (en) 2009-09-25 2015-02-02 Communication system, relay device, communication terminal, and base station
US15/202,285 US10063279B2 (en) 2009-09-25 2016-07-05 Communication system, relay device, communication terminal, and base station
US16/059,579 US10965341B2 (en) 2009-09-25 2018-08-09 Communication system, relay device, communication terminal, and base station

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US20180351602A1 (en) 2018-12-06
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US9402222B2 (en) 2016-07-26
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CN102511194A (zh) 2012-06-20
CN102511194B (zh) 2015-12-02
US20120182930A1 (en) 2012-07-19
EP2472983A1 (en) 2012-07-04
BR112012006061A2 (pt) 2016-03-29
JP2011071705A (ja) 2011-04-07
EP2472983A4 (en) 2015-10-28
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US10063279B2 (en) 2018-08-28
US8976725B2 (en) 2015-03-10

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