WO2011102446A1 - 基地局、中継装置及び通信システム - Google Patents
基地局、中継装置及び通信システム Download PDFInfo
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- WO2011102446A1 WO2011102446A1 PCT/JP2011/053461 JP2011053461W WO2011102446A1 WO 2011102446 A1 WO2011102446 A1 WO 2011102446A1 JP 2011053461 W JP2011053461 W JP 2011053461W WO 2011102446 A1 WO2011102446 A1 WO 2011102446A1
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- base station
- communication
- channel
- unit
- signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
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- 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
Definitions
- the present invention relates to communication between a base station and a relay device.
- Non-Patent Document 1 describes a standard for a communication system called a next generation PHS (Personal Handyphone System). This standard is called XGP (eXtended Global Platform).
- the relay device is arranged in a place where radio waves from the base station are difficult to reach, and the base station can communicate with the communication terminal via the relay device.
- Such a relay device may relay unnecessary waves that do not originally reach the base station. Therefore, the base station performs useless processing on unnecessary waves that are relayed.
- an unnecessary wave relayed by the relay device to the base station is a signal from a communication terminal with which the base station is directly communicating, or a signal from a communication terminal with which the base station is communicating via another relay device. May interfere. As a result, communication quality between the base station and the communication terminal may deteriorate.
- the present invention has been made in view of the above points, and an object thereof is to provide a technique capable of suppressing unnecessary waves from being relayed from a relay device to a base station.
- a base station is a base station that communicates with a communication terminal via a relay device, the base station receiving a signal from a communication terminal with which the base station communicates via the relay device, and the base A channel allocation unit that allocates a communication channel to a communication terminal that a station communicates with via the relay device, and a communication channel that the channel allocation unit allocates to a communication terminal with which the base station communicates via the relay device.
- a relay channel designating unit for designating a communication channel of a signal relayed by the relay device, and a notification signal for notifying the relay device of a communication channel designated by the relay channel designating unit, And a transmission unit for transmitting to.
- a base station is a base station in which the above base station is arranged as a peripheral base station, wherein the receiving unit receives a signal from the peripheral base station, and the receiving unit is the peripheral base station
- a common channel setting unit for setting a common channel for downlink communication in addition to the timing for receiving the signal of the common channel in the communication channel, wherein the common channel setting unit includes a communication frame to which the peripheral base station belongs to the first reception timing.
- the transmission timing after the delay amount is excluded as a common channel setting target for downlink communication, and the notification signal transmitted by the neighboring base station is When the signal unit is received, the transmission timing after only the delay amount than the timing when the notification signal is received, does not exclude a setting target of the common channel for the downlink communications.
- the relay apparatus is a relay apparatus that relays a signal from a communication terminal to a base station and relays a signal from the base station to the communication terminal, and communicates with the base station.
- the base station side communication unit and the terminal side communication unit are controlled.
- a communication system relays a signal from a communication terminal and a base station that communicates with the communication terminal to the base station, and relays a signal from the base station to the communication terminal.
- a relay unit that receives the signal from a communication terminal with which the base station communicates via the relay device, and a communication terminal with which the base station communicates via the relay device Communication of a signal relayed by the relay device so as to include a channel allocating unit that allocates a communication channel to the communication terminal and a communication channel that the channel allocating unit allocates to a communication terminal with which the base station communicates via the relay device
- the relay device includes a base station side communication unit that communicates with the base station, a terminal side communication unit that communicates with a communication terminal, the base station side communication unit, and the terminal A control unit that controls a side communication unit, the base station side communication unit receives a notification signal transmitted from the base station for notifying a communication channel of a signal relayed by the relay device, The control unit controls the base station side communication unit and the terminal side communication unit so that the relay device relays a signal of a communication channel notified by the notification signal.
- FIG. 1 is a diagram showing a configuration of a communication system 100 according to the present embodiment.
- the communication system 100 according to the present embodiment is a next-generation PHS, for example, and includes a plurality of base stations 1.
- Each base station 1 communicates with a plurality of communication terminals 2 by a TDMA / TDD (Time Division Multiple Access / Time Division Duplexing) method.
- Each base station 1 also employs an OFDMA (Orthogonal Frequency Division Multiple Access) method as a multiple access method.
- OFDMA Orthogonal Frequency Division Multiple Access
- an OFDM Orthogonal Frequency Division Multiplexing
- the communication area 1 a (service area) of each base station 1 partially overlaps the communication area 1 a of the neighboring base stations 1. Further, in the plurality of base stations 1, there is also a base station 1 that communicates with the communication terminal 2 via the relay device 3 (the right base station 1 in FIG. 1). The communication area 3a of the relay device 3 partially overlaps the communication area 1a of the target base station 1 to which the relay device 3 relays, and the communication area 1a of the base station 1 around the target base station 1 And some overlap.
- one relay device 3 is provided for one base station 1, but a plurality of relay devices 3 may be provided for one base station 1. In the following description, it is assumed that one relay device 3 is provided for one base station 1 unless otherwise specified.
- FIG. 2 is a block diagram showing the configuration of each base station 1.
- each base station 1 includes a communication unit 10, a control unit 14 that controls the communication unit 10, and a storage unit 19 that stores various types of information.
- the communication unit 10 communicates directly with the communication terminal 2 or communicates with the communication terminal 2 via the relay device 3.
- the communication unit 10 includes a reception unit 11 and a transmission unit 12 that share a transmission / reception antenna 13.
- the reception unit 11 performs amplification processing, down-conversion, and the like on the OFDM signal received by the transmission / reception antenna 13 and outputs a baseband OFDM signal to the control unit 14.
- the transmission unit 12 performs up-conversion and amplification processing on the OFDM signal for baseband transmission generated by the control unit 14 and inputs the OFDM signal in the carrier band to the transmission / reception antenna 13. As a result, the OFDM signal is wirelessly transmitted from the transmission / reception antenna 13.
- the control unit 14 is composed of a CPU and the like.
- the CPU of the control unit 14 executes the operation program stored in the storage unit 19.
- the control unit 14 performs an FFT (Fast Fourier Transform) process or the like on the OFDM signal output from the receiving unit 11 to obtain a plurality of complex symbols that respectively modulate a plurality of subcarriers constituting the OFDM signal.
- the control unit 14 converts the plurality of acquired complex symbols into bit data.
- the control unit 14 acquires bit data included in the OFDM signal received by the transmission / reception antenna 13.
- control unit 14 generates bit data for transmission, and generates a plurality of complex symbols corresponding to the bit data. Then, the control unit 14 performs IFFT (Inverse FFT) processing on the plurality of generated complex symbols, and generates a baseband OFDM signal in which a plurality of subcarriers modulated by the plurality of complex symbols are combined. To do. The control unit 14 outputs the generated OFDM signal to the transmission unit 12.
- IFFT Inverse FFT
- the control unit 14 is provided with a common channel setting unit 15, a channel allocation unit 16, a terminal specifying unit 17, and a relay channel designating unit 18 as functional blocks.
- the common channel setting unit 15 sets a common channel that is a communication channel shared by a plurality of communication terminals 2.
- the channel allocation unit 16 allocates an individual channel, which is a communication channel used for individual communication between the base station 1 and the communication terminal 2, to each communication terminal 2 to be communicated.
- the control unit 14 controls the communication unit 10
- the base station 1 communicates with the communication terminal 2 using the common channel set by the common channel setting unit 15, and at the channel allocation unit 16, the communication terminal 2 Individual communication is performed with the communication terminal 2 using the dedicated channel assigned to the communication terminal 2.
- the common channel is called CCH (Common Channel) and the individual channel is called ICH (Individual Channel).
- the terminal specifying unit 17 specifies the communication terminal 2 with which the base station 1 is communicating via the relay device 3.
- the communication terminal 2 communicating with the base station 1 via the relay device 3 indicates that the base station 1 communicates with the base station 1 via the relay device 3.
- a signal for notifying is transmitted. This signal is transmitted to the base station 1 via the relay device 3.
- the terminal specifying unit 17 of the base station 1 can specify the communication terminal 2 with which the base station 1 is communicating via the relay device 3.
- the terminal specifying unit 17 can specify the communication terminal 2 with which the base station 1 is communicating via the relay device 3.
- the communication terminal 2 with which the base station 1 communicates directly may be referred to as “direct communication terminal 2”
- the communication terminal 2 with which the base station 1 communicates via the relay device 3 may be referred to as “terminal 2 with relay”.
- the relay channel designating unit 18 transmits the communication channel of the signal relayed by the relay device 3 to the terminal 2 with relay specified by the terminal specifying unit 17 so as to include the communication channel assigned by the channel assigning unit 16 (hereinafter, (Referred to as “relay channel”).
- the control unit 14 generates a relay channel notification signal for notifying the relay channel specified by the relay channel specifying unit 18 and includes this in the transmission OFDM signal.
- the transmission unit 12 wirelessly transmits an OFDM signal including the relay channel notification signal from the transmission / reception antenna 13 to the relay device 3.
- the relay device 3 When receiving the OFDM signal including the relay channel notification signal from the base station 1, the relay device 3 operates to relay only the signal of the relay channel notified by the relay channel notification signal.
- the terminal specifying unit 17 and the relay channel designating unit 18 are not provided in the control unit 14 of the base station 1.
- FIG. 3 is a block diagram showing the configuration of each relay device 3.
- each relay device 3 includes a base station side communication unit 30 that communicates with the base station 1, a terminal side communication unit 34 that communicates with the communication terminal 2, a base station side communication unit 30, and A control unit 38 that controls the terminal-side communication unit 34 and a storage unit 39 that stores various types of information are provided.
- the base station side communication unit 30 includes a reception unit 31 and a transmission unit 32 that share the transmission / reception antenna 33.
- the reception unit 31 performs amplification processing, down-conversion, and the like on the OFDM signal received by the transmission / reception antenna 33 and outputs a baseband OFDM signal to the control unit 38.
- the transmission unit 32 performs up-conversion and amplification processing on the OFDM signal for baseband transmission generated by the control unit 38 and inputs the OFDM signal in the carrier band to the transmission / reception antenna 33. As a result, the OFDM signal is wirelessly transmitted from the transmission / reception antenna 33 toward the base station 1.
- the terminal-side communication unit 34 includes a reception unit 35 and a transmission unit 36 that share a transmission / reception antenna 37.
- the receiving unit 35 performs amplification processing, down-conversion, and the like on the OFDM signal received by the transmission / reception antenna 37, and outputs a baseband OFDM signal to the control unit 38.
- the transmission unit 36 performs up-conversion and amplification processing on the OFDM signal for baseband transmission generated by the control unit 38 and inputs the OFDM signal in the carrier band to the transmission / reception antenna 37. As a result, the OFDM signal is wirelessly transmitted from the transmission / reception antenna 37 toward the communication terminal 2.
- the control unit 38 is constituted by a CPU or the like.
- the CPU of the control unit 38 executes the operation program stored in the storage unit 39.
- the control unit 38 performs FFT (Fast Fourier Transform) processing or the like on the OFDM signal output from the receiving unit 31 of the base station side communication unit 30, and modulates a plurality of subcarriers constituting the OFDM signal. Get the complex symbol of. Then, the control unit 38 converts the acquired plurality of complex symbols into bit data. Thereby, the control unit 38 acquires bit data included in the OFDM signal from the base station 1 received by the transmission / reception antenna 33.
- FFT Fast Fourier Transform
- control unit 38 performs an FFT process or the like on the OFDM signal output from the receiving unit 35 of the terminal-side communication unit 34, and acquires a plurality of complex symbols that respectively modulate a plurality of subcarriers constituting the OFDM signal. To do. Then, the control unit 38 converts the acquired plurality of complex symbols into bit data. Thereby, the control unit 38 acquires bit data included in the OFDM signal from the communication terminal 2 received by the transmission / reception antenna 37.
- the control unit 38 When acquiring the bit data included in the OFDM signal received by the transmission / reception antenna 33, the control unit 38 generates bit data for transmission for the communication terminal 2 based on the bit data.
- the control unit 38 generates a plurality of complex symbols corresponding to the generated bit data.
- the control unit 38 performs IFFT processing on the plurality of generated complex symbols, and generates a baseband OFDM signal in which a plurality of subcarriers modulated by the plurality of complex symbols are combined.
- the control unit 38 outputs the generated OFDM signal to the transmission unit 36 of the terminal side communication unit 34.
- the transmission unit 36 transmits the input OFDM signal from the transmission / reception antenna 37. Thereby, the relay device 3 relays the signal received from the base station 1 to the communication terminal 2.
- the control unit 38 when acquiring the bit data included in the OFDM signal received by the transmission / reception antenna 37, the control unit 38 generates bit data for transmission for the base station 1 based on the bit data.
- the control unit 38 generates a plurality of complex symbols corresponding to the generated bit data.
- the control unit 38 performs IFFT processing on the plurality of generated complex symbols, and generates a baseband OFDM signal in which a plurality of subcarriers modulated by the plurality of complex symbols are combined.
- the control unit 38 outputs the generated OFDM signal to the transmission unit 32 of the base station side communication unit 30.
- the transmission unit 32 transmits the input OFDM signal from the transmission / reception antenna 33.
- the relay device 3 relays the signal received from the communication terminal 2 to the base station 1.
- the control unit 38 causes the relay device 3 to The base station side communication unit 30 and the terminal side communication unit 34 are controlled so as to relay only the signal of the communication channel notified by the notification signal.
- FIG. 4 is a diagram showing a configuration of the TDMA / TDD frame 200.
- the TDMA / TDD frame 200 is specified on a time-frequency plane with time and frequency on the horizontal and vertical axes, respectively.
- One TDMA / TDD frame 200 is composed of an upstream frame 200 u for the base station 1 to receive a signal from the communication terminal 2 and a downstream frame 200 d for the base station 1 to transmit a signal to the communication terminal 2. ing.
- Each of the uplink frame 200u and the downlink frame 200d includes a first slot SL1 to a fourth slot SL4 in the time direction, and a first subchannel SCH1 to an i-th subchannel SCHi (i ⁇ 2) in the frequency direction.
- i 9
- each of the upstream frame 200u and the downstream frame 200d includes the first subchannel SCH1 to the ninth subchannel SCH9 in the frequency direction.
- slots when there is no need to particularly distinguish the first slot SL1 to the fourth slot SL4, they may be simply referred to as “slots”. Also, the slot of the upstream frame 200u may be referred to as a “reception slot”, and the slot of the downstream frame 200d may be referred to as a “transmission slot”. Further, when there is no need to particularly distinguish the first subchannel SCH1 to the ninth subchannel SCH9, each may be simply referred to as “subchannel”.
- the time width of one slot is set to 625 ⁇ s. Therefore, the time length of each of the upstream frame 200u and the downstream frame 200d is 2.5 ms, and the time length of one TDMA / TDD frame 200 is 5 ms. Further, the bandwidth of one subchannel is 900 kHz, and one subchannel is composed of 24 subcarriers.
- One slot and one subchannel constitute a PRU (Physical Resource Unit) 210 that is a unit radio resource.
- Each of the upstream frame 200u and the downstream frame 200d is composed of 36 PRUs 210.
- the channel allocation unit 16 of the base station 1 sets at least one PRU 210 of the 36 PRUs 210 as an individual channel for each of the plurality of communication terminals 2 to be communicated for each of the uplink frame 200u and the downlink frame 200d.
- the assignment is made so as not to overlap between the plurality of communication terminals 2.
- the PRU 210 at the same location is assigned as an individual channel to the same communication terminal 2 in the uplink frame 200u and the downlink frame 200d.
- the PRU 210 including the second slot SL2 and the sixth subchannel SCH6 and the PRU 210 including the third slot SL3 and the sixth subchannel SCH6 are allocated to the communication terminal 2 as individual channels for downlink communication.
- the PRU 210 including the second slot SL2 and the sixth subchannel SCH6 and the PRU 210 including the third slot SL3 and the sixth subchannel SCH6 are used as dedicated channels for uplink communication. Assigned to terminal 2.
- Allocation of an individual channel to the communication terminal 2 at the base station 1 is performed in response to an allocation request from the communication terminal 2.
- the control unit 14 allocates an individual channel (PRU 210) to the communication terminal 2 in the channel allocation unit 16.
- the control part 14 produces
- the communication terminal 2 performs bidirectional individual communication with the base station 1 using the dedicated channel (PRU 210) notified by the assigned channel notification signal.
- the common channel setting unit 15 when the base station 1 is turned on and activated, the common channel setting unit 15 first sets a common channel. Specifically, the common channel setting unit 15 uses the first subchannel SCH1 in one transmission slot among the plurality of transmission slots included in the plurality of TDMA / TDD frames 200 for the common channel ( Hereinafter, it is referred to as “downlink common channel”. The common channel setting unit 15 then receives the reception slot (for example, the first slot SL1) in the same location as the transmission slot (for example, the first slot SL1) of the downlink common channel in the uplink frame 200u of the TDMA / TDD frame 200 to which the downlink common channel belongs. ) Of the first subchannel SCH1 is set as a common channel used for uplink communication (hereinafter referred to as “uplink common channel”).
- uplink common channel a common channel used for uplink communication
- the common channel setting unit 15 sets the uplink common channel and the downlink common channel to the reception slot and the transmission slot that form a pair in the same TDMA / TDD frame 200, respectively.
- a common channel appears for each of a plurality of TDMA / TDD frames 200.
- the base station 1 intermittently transmits a downlink common channel control signal (hereinafter also referred to as “CCH signal”).
- CCH signal a downlink common channel control signal
- the plurality of TDMA / TDD frames 200 are referred to as “intermittent transmission frames”.
- the time length of the intermittent transmission frame is referred to as “LCCH (Logical CCH) interval”.
- the base station 1 When the base station 1 is activated, the base station 1 receives the CCH signal transmitted by the neighboring base station 1. Then, based on the reception result, the base station 1 identifies a transmission slot in which the peripheral base station 1 is not transmitting the CCH signal from among a plurality of transmission slots included in the intermittent transmission frame, It is determined that the station 1 is a transmission slot that is not used as a downlink common channel.
- the base station 1 sets the first subchannel SCH1 of one transmission slot among the transmission slots not used as the downlink common channel by the neighboring base station 1 as the downlink common channel, and the one transmission slot In the uplink frame 200u of the TDMA / TDD frame 200 to which it belongs, the first subchannel SCH1 of the reception slot at the same location as the one transmission slot is set as the uplink common channel.
- the downlink common channel in the own apparatus is set in addition to the timing of receiving the downlink common channel signal in the peripheral base station 1.
- the base station 1 transmits a control signal using the set downlink common channel and receives a control signal from the communication terminal 2 using the set uplink common channel.
- the intermittent transmission frame is composed of, for example, 20 TDMA / TDD frames 200
- Each of the 80 reception slots forming a pair is included. Therefore, a maximum of 80 base stations 1 can transmit CCH signals at different transmission timings and can receive control signals from the communication terminal 2 at different reception timings. Therefore, in this case, a maximum of 80 base stations 1 can be arranged close to each other.
- the communication terminal 2 When the communication terminal 2 starts communication with the base station 1, the communication terminal 2 receives CCH signals from a plurality of neighboring base stations 1, and determines a connection destination base station 1 based on the CCH signals. For example, the communication terminal 2 sets the base station 1 that transmits the CCH signal having the highest reception level among the CCH signals from the plurality of neighboring base stations 1 as the connection destination base station 1. Then, the communication terminal 2 synchronizes the TDMA / TDD frame 200 in its own device with the TDMA / TDD frame 200 in the connection destination base station 1 based on the CCH signal transmitted from the connection destination base station 1.
- the communication terminal 2 uses the downlink common channel corresponding to the uplink common channel to which the connected base station 1 is transmitting the CCH signal, to request the own device to allocate an individual channel.
- An allocation request signal is transmitted.
- the base station 1 that has received the assignment request signal assigns a communication channel as an individual channel to the communication terminal 2 that has transmitted the assignment request signal in the channel assignment unit 16, and downloads the assigned channel notification signal to the communication terminal 2. Transmit on a common channel.
- the base station 1 transmits the above-described relay channel notification signal to the relay device 3.
- the communication terminal 2 performs two-way individual communication with the base station 1 using the communication channel (PRU 210) notified by the allocation channel notification signal.
- the relay device 3 determines the base station 1 to be relayed when its power is supplied and started. For example, the relay device 3 receives CCH signals from a plurality of neighboring base stations 1 and relays the base station 1 that transmits the CCH signal having the highest reception level among the plurality of received CCH signals to the base station 1 to be relayed. And When the relay device 3 receives the relay channel notification signal transmitted from the base station 1 to be relayed, the relay device 3 operates to relay the signal of the communication channel notified by the relay channel notification signal.
- the relay device 3 when the communication channels notified by the relay channel notification signal are the second subchannel SCH2 to the sixth subchannel SCH6 of the first slot SL1, the relay device 3 is transmitted from the base station 1, The signals of the second subchannel SCH2 to the sixth subchannel SCH6 of 1 slot SL1 are relayed to the communication terminal 2 and transmitted from the communication terminal 2, and the second subchannel SCH2 to the sixth subchannel SCH6 of the first slot SL1 are transmitted. Is relayed to the base station 1.
- the relay operation in the relay device 3 will be described in detail.
- the communication area 3a of the relay device 3 is the base station 1 (the right base station 1) to which the relay device 3 relays signals. )
- the communication terminal 2 communicating with the surrounding base station 1 may exist in the communication area 3 a of the relay device 3.
- the relay device 3 receives an unnecessary wave from the communication terminal 2 that is not a relay target.
- FIG. 5 is a diagram showing this state.
- the communication area 3a of the relay device 3 communicates with a base station 1 (left base station 1) different from the relay target base station 1 (right base station 1).
- a communication terminal 2 that is, a communication terminal 2 that is not a relay target. Therefore, the relay device 3 receives the unnecessary wave 120 from the communication terminal 2 that is not a relay target.
- the relay device 3 also transmits the received unnecessary wave 120 to the base station 1 to relay it.
- an unnecessary wave from the relay device 3 and a signal from the direct communication terminal 2 may interfere with each other.
- the base station 1 communicates with an unnecessary wave from the relay apparatus 3 via another relay apparatus 3.
- the signal from the communication terminal 2 may interfere.
- the communication quality between the base station 1 and the communication terminal 2 may deteriorate.
- the base station 1 demonstrates the specific example in case the unnecessary wave from the relay apparatus 3 and the signal from the communication terminal 2 which is performing direct communication interfere.
- FIG. 6 is a diagram illustrating a TDMA / TDD frame 200 (right side) between the base station 1 and the relay device 3 and a TDMA / TDD frame 200 (left side) between the relay device 3 and the communication terminal 2.
- the communication channel (PRU 210) assigned to the relayed terminal 2 is indicated by a diagonal line with a lower right. Further, the communication channel (PRU 210) assigned to the direct communication terminal 2 is indicated by a diagonal line rising to the right.
- the base station 1 sends the relayed terminal 2 the sixth subchannel SCH6 to the eighth subchannel SCH8 in the first slot SL1, and the fourth subchannel SCH4 to the sixth subchannel SCH6 in the second slot SL2.
- the subchannel SCH6 is assigned as a communication channel.
- the base station 1 assigns the ninth subchannel SCH9 in the fourth slot SL4 as a communication channel to the direct communication terminal 2.
- the relay device 3 In such a case, as indicated by a horizontal line in the left upstream frame 200u, the relay device 3 generates unnecessary waves from the communication terminal 2 communicating with the base station 1 different from the base station 1 to be relayed. Then, when receiving the eighth subchannel SCH8 and the ninth subchannel SCH9 in the third slot SL3 and the sixth subchannel SCH6 to the ninth subchannel SCH9 in the fourth slot SL4, the relay device 3 Transmission is performed using the eighth subchannel SCH8 and the ninth subchannel SCH9 in the third slot SL3 and the sixth subchannel SCH6 to the ninth subchannel SCH9 in the fourth slot SL4.
- the base station 1 uses the eighth subchannel SCH8 and the ninth subchannel SCH9 in the third slot SL3 and the sixth subchannels SCH6 to SCH9 in the fourth slot SL4.
- the subchannel SCH9 an unnecessary wave from the relay device 3 is received.
- the base station 1 since the ninth subchannel SCH9 of the fourth slot SL4 is directly assigned to the communication terminal 2, the base station 1 receives the ninth subchannel SCH9 of the fourth slot SL4 from the relay device 3. And the signal of the ninth subchannel SCH9 of the fourth slot SL4 from the direct communication terminal 2 interfere with each other.
- the base station 1 may not be able to receive signals from the direct communication terminal 2 properly.
- the ninth subchannel SCH9 of the fourth slot SL4 is shown with both a right-upward diagonal line and a horizontal line.
- the base station 1 designates the relay channel so as to include the communication channel assigned to the relayed terminal 2. Then, the base station 1 generates a relay channel notification signal for notifying the designated relay channel, and transmits it to the relay device 3.
- the relay device 3 operates so as to relay only the signal of the relay channel notified by the relay channel notification signal received from the base station 1. Thereby, it can suppress that the relay apparatus 3 relays the unnecessary wave from the communication terminal 2 which is not a relay object to the base station 1.
- FIG. As a result, the communication quality between the base station 1 and the communication terminal 2 is improved.
- a plurality of specific examples of the method for specifying the relay channel will be described below.
- FIG. 7 is a diagram showing a relay channel notification signal according to this example.
- the relay channel can be specified in units of PRU 210.
- the relay channel notification signal is 1-bit information indicating whether or not to relay the signal of the PRU 210 for each of 36 PRUs 210 constituting each of the upstream frame 200u and the downstream frame 200d. Is included. That is, the relay channel communication signal is transmitted from the first subchannel SCH1 to the ninth subchannel SCH9 in the first slot SL1, the first subchannel SCH1 to the ninth subchannel SCH9 in the second slot SL1, and the first subchannel in the third slot SL1.
- 1-bit information indicating whether or not to relay the signal of the subchannel is included.
- 1-bit information corresponding to the PRU 210 is “1”, this means that the signal of the PRU 210 is relayed.
- it is “0”, that the signal of the PRU 210 is not relayed. means.
- the base station 1 can designate a relay channel in units of PRU 210, only the communication channel assigned to the relayed terminal 2 can be used as the relay channel.
- the 1-bit information corresponding to the fourth subchannel SCH4 to the sixth subchannel SCH6 is “1”, and these subchannels are designated as relay channels.
- FIG. 8 is a diagram showing a TDMA / TDD frame 200 when only the communication channel assigned to the relayed terminal 2 is designated as the relay channel in the example of FIG. 6 described above.
- the relay channel is indicated by a vertical line.
- the sixth subchannel SCH6 to the eighth subchannel SCH8 in the first slot SL1 and the fourth subchannel SCH4 to the sixth subchannel SCH6 in the second slot SL2 are communication channels assigned to the relayed terminal 2 and Since it is a relay channel, in the left downstream frame 200d and the right upstream frame 200u, these sub-channels are shown with both right-down diagonal lines and vertical lines.
- the relay apparatus 3 relays only the signal of the communication channel assigned to the relayed terminal 2 in the base station 1. .
- the relay device 3 transmits unnecessary waves from the communication terminal 2 communicating with the base station 1 different from the base station 1 to be relayed to the eighth subchannel SCH8 and the ninth subchannel in the third slot SL3.
- the unnecessary wave is not relayed to the base station 1 to be relayed.
- the base station 1 can appropriately receive the signal of the ninth subchannel SCH9 of the fourth slot SL4 from the direct communication terminal 2. Therefore, the communication quality between the base station 1 and the communication terminal 2 is improved.
- FIG. 9 is a diagram showing a relay channel notification signal according to this example.
- a relay channel can be specified using a resource group including nine PRUs 210 arranged in the frequency direction as a specified unit. That is, in this example, the relay channel can be designated by a slot, and all nine PRUs 210 included in the designated slot are relay channels.
- the relay channel notification signal includes 1-bit information corresponding to each of the first slot SL1 to the fourth slot SL4.
- 1-bit information corresponding to a slot is “1”, it means that the signals of all PRUs 210 in that slot are relayed, and if “0”, all the information in that slot is relayed. This means that the PRU 210 signal is not relayed.
- 1-bit information corresponding to the first slot SL1 and the second slot SL2 is “1”, respectively, and all PRUs 210 included in these slots are designated as relay channels.
- FIG. 10 is a diagram showing a TDMA / TDD frame 200 when all the PRUs 210 in the first slot SL1 and the second slot SL2 are designated as relay channels in the example of FIG. 6 described above.
- the sixth subchannel SCH6 to the eighth subchannel SCH8 in the first slot SL1 and the fourth subchannel SCH4 to the sixth subchannel SCH6 in the second slot SL2 are communication channels assigned to the relayed terminal 2 and Since it is a relay channel, in the left downstream frame 200d and the right upstream frame 200u, these sub-channels are shown with both right-down diagonal lines and vertical lines.
- the relay device 3 causes the base station to be relayed to 1, unnecessary waves from the communication terminal 2 communicating with the base station 1 different from 1 are transmitted as the eighth subchannel SCH8 and the ninth subchannel SCH9 in the third slot SL3 and the sixth subchannel SCH6 to SCH6 in the fourth slot SL4. Even if it is received by the ninth subchannel SCH9, the unnecessary wave is not relayed to the base station 1 to be relayed.
- the signal of the ninth subchannel SCH9 in the fourth slot SL4 from the direct communication terminal 2 does not interfere with the unnecessary wave from the relay device 3, and appropriately receives the signal. be able to. Therefore, the communication quality between the base station 1 and the communication terminal 2 is improved.
- FIG. 11 is a diagram showing a relay channel notification signal according to this example.
- a relay channel can be specified using a resource group including four PRUs 210 arranged in the time direction as a specified unit. That is, in this example, the relay channel can be designated as a subchannel, and all designated subchannels in the first slot SL1 to the fourth slot SL4 become relay channels.
- the relay channel notification signal includes 1-bit information corresponding to each of the first subchannel SCH1 to the ninth subchannel SCH9.
- the 1-bit information corresponding to the subchannel is “1”, it means that the signal of the subchannel in the first slot SL1 to the fourth slot SL4 is relayed, and in the case of “0”, This means that the signal of the subchannel in the first slot SL1 to the fourth slot SL4 is not relayed.
- 1-bit information corresponding to the fourth subchannel SCH4 to the eighth subchannel SCH8 is “1”, and all of these subchannels in the first slot SL1 to the fourth slot SL4 Is specified as a relay channel.
- FIG. 12 is a diagram showing a TDMA / TDD frame 200 when the fourth subchannel SCH4 to the eighth subchannel SCH8 in the first slot SL1 to the fourth slot SL4 are designated as relay channels in the example of FIG. 6 described above. It is.
- the sixth subchannel SCH6 to the eighth subchannel SCH8 in the first slot SL1 and the fourth subchannel SCH4 to the sixth subchannel SCH6 in the second slot SL2 are communication channels assigned to the relayed terminal 2 and Since it is a relay channel, in the left downstream frame 200d and the right upstream frame 200u, these sub-channels are shown with both right-down diagonal lines and vertical lines.
- the relay device 3 shows an unnecessary wave from a communication terminal 2 communicating with a base station 1 different from the base station 1 to be relayed, and an eighth subchannel SCH8, a ninth subchannel SCH9 and a fourth slot in the third slot SL3.
- the relay device 3 When receiving on the sixth subchannel SCH6 to the ninth subchannel SCH9 in SL4, only the unnecessary waves of the eighth subchannel SCH8 in the third slot SL3 and the sixth subchannel SCH6 to the eighth subchannel SCH8 in the fourth slot SL4 are relayed.
- the signal of the ninth subchannel SCH9 in the fourth slot SL4 from the direct communication terminal 2 does not interfere with the unnecessary wave from the relay device 3, and appropriately receives the signal. be able to. Therefore, the communication quality between the base station 1 and the communication terminal 2 is improved.
- the eighth subchannel SCH8 in the third slot SL3 and the sixth subchannel SCH6 to the eighth subchannel SCH8 in the fourth slot SL3 are unnecessary wave communication channels and relay channels, so the right upstream frame 200u In these subchannels, both horizontal and vertical lines are shown.
- a relay channel is designated so as to include a communication channel assigned to terminal 2 with relay, and a relay channel notification signal for notifying the designated relay channel is transmitted to relay device 3. Is done. Therefore, the relay device 3 does not relay signals other than the communication channel signal notified from the base station 1. Therefore, it is possible to suppress the relay device 3 from relaying unnecessary waves to the base station 1. As a result, it is not necessary for the base station 1 to perform unnecessary processing on unnecessary waves, and the communication quality between the base station 1 and the communication terminal 2 can be improved.
- the relay device 3 since the relay device 3 only needs to operate so as to relay only the signal of the relay channel notified from the base station 1, the relay device 3 generates unnecessary waves without complicating the configuration of the relay device 3. Relaying to the base station 1 can be suppressed. Therefore, the relay device 3 can be realized with an inexpensive configuration.
- the relay device 3 can reliably relay unnecessary waves to the base station 1. In addition to being able to suppress, radio resources can be used effectively.
- a resource group consisting of nine PRUs 210 arranged in the frequency direction is designated as a designated unit, or a resource group consisting of four PRUs 210 arranged in the time direction is designated.
- the relay device 3 When a relay channel is specified as a unit, the relay device 3 only needs to perform relay processing in units of resource groups. Therefore, the relay process in the relay device 3 can be simplified.
- the relay channel specifying unit 18 specifies the relay channel.
- the relay channel is designated so that the communication channel is not included, as shown in FIGS.
- the channel allocating unit 16 assigns at least one resource group designated as the relay channel when allocating the communication channel directly to the communication terminal 2 after the relay channel designating unit 18 designates the relay channel.
- a communication channel that does not belong is directly assigned to the communication terminal 2.
- the channel allocation unit 16 includes a resource group consisting of nine PRUs 210 in the first slot SL1 and a resource group consisting of nine PRUs 210 in the second slot SL1 that are designated as relay channels.
- a communication channel that does not belong to both, for example, the third subchannel SCH3 of the third slot SL3 is directly assigned to the communication terminal 2.
- the channel allocation unit 16 determines a communication channel to be added from at least one resource group designated as a relay channel. For example, in the example of FIG. 10, it is desirable to determine a communication channel to be added from a plurality of PRUs 210 in the first slot SL1 and the second slot SL2. In the example of FIG. 12, it is desirable to determine a communication channel to be added from the fourth subchannel SCH4 to the eighth subchannel SCH8 in the first slot SL1 to the fourth slot SL.
- the base station 1 when adding a communication channel to be assigned to the relayed terminal 2 in the base station 1, by determining a communication channel to be added from at least one resource group designated as the relay channel, There is no need to newly specify the relay channel. Therefore, the base station 1 does not need to transmit a relay channel notification signal to the relay device 3 every time a communication channel assigned to the relayed terminal 2 is added.
- a communication channel not designated as a relay channel is a communication channel to be added, it is necessary to add a resource group including the communication channel as a relay channel. As a result, the number of communication channels that can be directly assigned to the communication terminal 2 decreases.
- a communication channel to be added is determined from at least one resource group designated as a relay channel, it is not necessary to add another resource group as a relay channel. Therefore, it is possible to suppress a decrease in the number of communication channels that can be directly assigned to the communication terminal 2 by adding the communication channel assigned to the terminal 2 with relay.
- the relay device 3 may transmit the signal from the relay source to the relay destination without frequency conversion, or may convert the signal from the relay source to the relay destination after frequency conversion.
- the relay device 3 frequency-converts the signal from the relay source and transmits it to the relay destination, the frequency band used by the base station side communication unit 30 for communication with the base station 1 and the terminal side communication unit 34
- the frequency band used for communication with the communication terminal 2 is different. That is, the frequency band from the first subchannel SCH1 to the ninth subchannel SCH9 used for communication between the base station 1 and the relay device 3 and the communication between the relay device 3 and the communication terminal 2 are used.
- the frequency bands from the first subchannel SCH1 to the ninth subchannel SCH9 are different from each other.
- the transmission signal of the communication terminal 2 that communicates with the base station 1 via the relay device 3 reaches the base station 1 directly, the transmission signal is prevented from becoming an interference wave in the base station 1. it can. This is because the frequency band of the transmission signal and the frequency band processed by the base station 1 are different from each other.
- the relay device 3 delays the signal from the base station 1 and transmits it to the communication terminal 2 or delays the signal from the communication terminal 2 and transmits it to the base station 1, the received signal is temporarily transmitted. In this case, the cost of the relay device 3 can be reduced because the relay device 3 can be realized by providing a buffer for storing the data.
- FIG. 13 is a diagram showing this state. In the following description, as an example, it is assumed that the relay device 3 transmits a signal from the relay source to the relay destination with a delay of 0.5 frame.
- the TDMA / TDD frame 200 between the base station 1 and the relay device 3 is shown on the upper side
- the TDMA / TDD frame 200 between the relay device 3 and the communication terminal 2 is shown on the lower side.
- the uplink common channel and the downlink common channel are set to the first subchannel SCH1 in the first slot SL1 of the uplink frame 200u and the downlink frame 200d of the same TDMA frame 200, respectively.
- the CCH signal 300 is received by the relayed terminal 2 after 0.5 frame due to the delay amount in the relay device 3. Is done.
- the relayed terminal 2 receives the first slot SL1 of the uplink frame 200u paired with the first slot SL1 in the TDMA / TDD frame 200 to which the first slot SL1 of the downlink frame 200d that receives the CCH signal 300 from the base station 1 belongs.
- the above-described allocation request signal 310 is transmitted. This allocation request signal 310 reaches the base station 1 after 0.5 frames due to the delay amount in the relay device 3.
- the allocation request signal from the communication terminal 2 arrives at the base station 1 at the reception timing (reception slot) one frame after the reception timing (reception slot) for which the uplink common channel is set. . Therefore, the base station 1 cannot receive the allocation request signal from the communication terminal 2. As a result, the base station 1 does not assign an individual channel to the communication terminal 2 that has transmitted the assignment request signal, and the communication terminal 2 cannot communicate with the base station 1 individually.
- the common channel setting unit 15 receives the original reception timing from the communication terminal 2, that is, the reception timing RT1 at which the base station 1 directly receives the signal from the communication terminal 2 (hereinafter referred to as “first reception”).
- the uplink common channel is set not only at the timing RT1 ”but also at the reception timing RT2 (hereinafter referred to as“ second reception timing ”) at which the base station 1 receives a signal from the relayed terminal 2.
- the common channel since the common channel is set to the first subchannel SCH1 of the first slot SL1, the common channel setting unit 15 directly receives the allocation request signal from the communication terminal 2 in the uplink frame 200u.
- An uplink common channel is set not only in the first subchannel SCH1 of 1 slot SL1, but also in the first subchannel SCH1 of the first slot SL1 of the uplink frame 200u that receives the allocation request signal from the relayed terminal 2.
- the base station 1 can receive the signal from the direct communication terminal 2 on the original uplink common channel, and can receive the allocation request signal from the relayed terminal 2 that is received with a delay after that. It can be received on a common channel.
- the uplink common channel set at the first reception timing RT1 is called “first uplink common channel”, and the uplink common channel set at the second reception timing RT2 is called “second uplink common channel”.
- first transmission timing ST1 the transmission timing paired with the first reception timing RT1 in the TDMA / TDD frame 200 to which the first reception timing RT1 belongs.
- first transmission timing ST1 the transmission timing paired with the first reception timing RT1 in the TDMA / TDD frame 200 to which the first reception timing RT1 belongs.
- the transmission timing paired with the second reception timing RT2 in the TDMA / TDD frame 200 to which the second reception timing RT2 belongs is referred to as “second transmission timing ST2” (see FIG. 13).
- the delay amount of the second reception timing RT2 with respect to the first reception timing RT1 is referred to as “reception delay amount”.
- the delay amount is set to be the same. Therefore, the reception delay amount for each relay device 3 is also the same.
- each base station 1 sets its own downlink common channel to a transmission slot that the neighboring base station 1 does not set as a downlink common channel among a plurality of transmission slots included in the intermittent transmission frame.
- Each base station 1 sets its own uplink common channel for the reception slot that forms a pair with the transmission slot for which the downlink common channel is set. Therefore, the uplink common channel of the neighboring base station 1 may be set at the second reception timing RT2 in which the second uplink common channel added by the base station 1 is set.
- the peripheral base station 1 receives an allocation request signal from the communication terminal 2 that is not the communication target, and secures a communication channel for individual communication with the communication terminal 2. .
- the radio resources that can be secured for individual communication with the original communication terminal 2 are reduced, and the radio resources cannot be effectively used.
- each base station 1 receives the signal transmitted by the neighboring base station 1 at the first transmission timing ST1 paired with the first reception timing RT1, that is, the CCH signal of the neighboring base station 1,
- the transmission timing (that is, the second transmission timing ST2) after the reception delay amount from the timing at which the signal is received is excluded as the setting target of the downlink common channel in the own device, and the reception timing that makes a pair with the transmission timing ( That is, the second reception timing RT2) is excluded as a setting target of the uplink common channel in the own apparatus.
- the base station 1 transmits the signal transmitted by the neighboring base station 1 at the first transmission timing ST1.
- the first subchannel SCH1 of the first slot SL1 of the downlink frame 200u that is one frame later than the first slot SL1 of the received downlink frame 200u is excluded as a downlink common channel setting target in the own apparatus, and the first The first subchannel SCH1 of the first slot SL1 of the uplink frame 200u that forms a pair with the slot SL1 is excluded as an uplink common channel setting target in the own apparatus. Accordingly, it is possible to suppress the uplink common channel of the neighboring base station 1 from being set at the second reception timing RT2 at which the second uplink common channel is set in the base station 1.
- the base station 1 sets a downlink common channel also at the second transmission timing ST2 and transmits the above-described relay channel notification signal at the second transmission timing ST2. That is, it is preferable that the base station 1 sets an additional downlink common channel with respect to the second transmission timing ST2, and transmits the relay channel notification signal using the additional downlink common channel. Since the downlink common channel of the neighboring base station 1 is not set at the second transmission timing ST2 at the base station 1, the relay channel notification signal is transmitted using the first subchannel SCH1 at the second transmission timing ST2. By transmitting, it is possible to prevent interference between the relay channel notification signal and the CCH signal from the neighboring base station 1 while effectively using the radio resource. At this time, each base station 1 uses the downlink common channel for the transmission timing after the reception delay amount from the timing of receiving the relay channel notification signal transmitted on the additional downlink common channel in the neighboring base station 1. It is not necessary to exclude it as a setting target.
- the terminal specifying unit 17 determines whether the allocation request signal from the communication terminal 2 is received. It may be determined whether the communication terminal 2 is the relayed terminal 2. In the example of FIG. 13, the reception timing (second reception timing) of the allocation request signal from the relayed terminal 2 is delayed by one frame from the reception timing (first reception timing) of the allocation request signal from the direct communication terminal 2. . Therefore, the terminal specifying unit 17 can specify the communication terminal 2 that transmits the allocation request signal received late as the terminal 2 with relay. This eliminates the need for the communication terminal 2 to notify the base station 1 that the own device is communicating with the base station 1 via the relay device 3, and the base station 1 only performs processing in the own device. Thus, the relay channel notification signal can be transmitted to the terminal 2 with relay.
- the relay apparatus 3 delays the signal from the relay source by 0.5 frame and relays it to the relay destination.
- the base station 1 relays the signal from the terminal 2 with the uplink frame 200u.
- the delay amount in the relay device 3 may be any value.
- the delay amount in the relay apparatus 3 is N frames (N is an integer of 1 or more) or (M + 0.5) frames (M is an integer of 0 or more) may be used. That is, the delay amount of the relay device 3 may be an integral multiple of the frame length when it is doubled.
- the present invention can also be applied to other communication systems.
- the present invention can be applied to LTE (Long Termination Evolution) and WiMAX (Worldwide Interoperability for Microwave Access).
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Abstract
Description
次に、中継装置3での中継動作について詳細に説明する。本実施の形態に係る通信システム100では、上述の図1に示されるように、中継装置3の通信エリア3aは、当該中継装置3が信号を中継する対象の基地局1(右側の基地局1)の通信エリア1aだけではなく、その周辺の基地局1(左側の基地局1)の通信エリア1aとも部分的に重複している。したがって、その周辺の基地局1と通信している通信端末2が、中継装置3の通信エリア3aに存在する場合がある。この場合には、中継装置3は、中継対象ではない通信端末2からの不要波を受信することになる。図5は、その様子を示す図である。
図7は本例に係る中継チャネル通知信号を示す図である。本例では、中継チャネルをPRU210単位で指定できるようになっている。図7に示されるように、中継チャネル通知信号は、上りフレーム200u及び下りフレーム200dのそれぞれを構成する36個のPRU210のそれぞれについて、そのPRU210の信号を中継するか否かを示す1ビットの情報を含んでいる。つまり、中継チャネル通信信号は、第1スロットSL1における第1サブチャネルSCH1~第9サブチャネルSCH9、第2スロットSL1における第1サブチャネルSCH1~第9サブチャネルSCH9、第3スロットSL1における第1サブチャネルSCH1~第9サブチャネルSCH9及び第4スロットSL1における第1サブチャネルSCH1~第9サブチャネルSCH9のそれぞれについて、そのサブチャネルの信号を中継するか否かを示す1ビットの情報を含んでいる。本例では、PRU210に対応する1ビットの情報が“1”の場合には、そのPRU210の信号を中継することを意味し、“0”の場合には、そのPRU210の信号を中継しないことを意味する。
図9は本例に係る中継チャネル通知信号を示す図である。本例では、周波数方向に並ぶ9個のPRU210から成るリソースグループを指定単位として中継チャネルを指定することができる。つまり本例では、中継チャネルをスロットで指定することができ、指定されたスロットに含まれる9個のPRU210がすべて中継チャネルとなる。
図11は本例に係る中継チャネル通知信号を示す図である。本例では、時間方向に並ぶ4個のPRU210から成るリソースグループを指定単位として中継チャネルを指定することができる。つまり本例では、中継チャネルをサブチャネルで指定することができ、第1スロットSL1~第4スロットSL4における、指定されたサブチャネルがすべて中継チャネルとなる。
中継装置3が、基地局1あるいは通信端末2からの信号をリアルタイムで中継するためには、中継装置3のコストがかかる。
2 通信端末
3 中継装置
11 受信部
12 送信部
14 制御部
15 共通チャネル設定部
16 チャネル割り当て部
17 端末特定部
18 中継チャネル指定部
30 基地局側通信部
34 端末側通信部
38 制御部
100 通信システム
200 TDMA/TDDフレーム
200d 下りフレーム
200u 上りフレーム
Claims (11)
- 通信端末と中継装置を介して通信を行う基地局であって、
前記基地局が中継装置を介して通信する通信端末からの信号を受信する受信部と、
前記基地局が前記中継装置を介して通信する通信端末に対して通信チャネルを割り当てるチャネル割り当て部と、
前記基地局が前記中継装置を介して通信する通信端末に対して前記チャネル割り当て部が割り当てる通信チャネルを含むように、当該中継装置が中継する信号の通信チャネルを指定する中継チャネル指定部と、
前記中継チャネル指定部で指定される通信チャネルを前記中継装置に通知するための通知信号を、前記中継装置に送信する送信部と
を備える、基地局。 - 請求項1に記載の基地局であって、
前記受信部は、前記基地局が直接通信する通信端末からの信号も受信し、
前記チャネル割り当て部は、前記基地局が直接通信する通信端末に対しても通信チャネルを割り当て、
前記基地局が中継装置を介して通信する通信端末からの信号についての前記受信部での受信タイミングは、前記基地局が直接通信する通信端末からの信号についての前記受信部での受信タイミングよりも遅延し、
前記受信部での通信端末からの信号の受信タイミングに基づいて、前記基地局が中継装置を介して通信を行う通信端末を特定する特定部をさらに備える、基地局。 - 請求項1に記載の基地局であって、
前記チャネル割り当て部は、時間-周波数平面上で特定される複数の単位無線リソースのうちの少なくとも一つを通信チャネルとして通信端末に割り当て、
前記中継チャネル指定部は、前記基地局が中継装置を介して通信を行う通信端末に割り当てられる通信チャネルだけを、当該中継装置が中継する信号の通信チャネルとして指定する、基地局。 - 請求項1に記載の基地局であって、
前記チャネル割り当て部は、時間-周波数平面上で特定される複数の単位無線リソースのうちの少なくとも一つを通信チャネルとして通信端末に割り当て、
前記中継チャネル指定部は、時間方向に並ぶ複数の単位無線リソースから成るリソースグループを指定単位として、あるいは周波数方向に並ぶ複数の単位無線リソースから成るリソースグループを指定単位として、前記中継装置が中継する信号の通信チャネルを指定する、基地局。 - 請求項4に記載の基地局であって、
前記チャネル割り当て部は、
前記基地局が前記中継装置を介して通信を行う通信端末に割り当てる通信チャネルを追加する場合には、
前記中継装置が中継する信号の通信チャネルとして指定されている少なくとも一つの前記リソースグループの中から、追加する通信チャネルを決定する、基地局。 - 請求項4に記載の基地局であって、
前記受信部は、前記基地局が直接通信する通信端末からの信号も受信し、
前記チャネル割り当て部は、前記基地局が直接通信する通信端末に対しても通信チャネルを割り当て、
前記チャネル割り当て部は、前記中継装置が中継する信号の通信チャネルとして指定されている少なくとも一つの前記リソースグループには属さない通信チャネルを、前記基地局が直接通信している通信端末に割り当てる、基地局。 - 請求項1に記載の基地局であって、
前記受信部は、前記基地局が直接通信する通信端末からの信号も受信し、
前記チャネル割り当て部は、前記基地局が直接通信する通信端末に対しても通信チャネルを割り当て、
前記中継チャネル指定部は、前記中継装置が中継する信号の通信チャネルを指定するときに、前記基地局が直接通信する通信端末に対して通信チャネルがすでに割り当てられている場合には、当該通信チャネルを避けて前記中継装置が中継する信号の通信チャネルを指定する、基地局。 - 請求項1に記載の基地局であって、
前記受信部は、前記基地局が直接通信する通信端末からの信号も受信し、
前記チャネル割り当て部は、前記基地局が直接通信する通信端末に対しても通信チャネルを割り当て、
前記受信部は、前記基地局が前記中継装置を介して通信する通信端末からの信号を、前記基地局が直接通信する通信端末からの信号とは異なったタイミングで受信し、
前記基地局が直接通信する通信端末からの信号を前記受信部が受信するタイミングである第1受信タイミングと、前記基地局が前記中継装置を介して通信する通信端末からの信号を前記受信部が受信するタイミングである第2受信タイミングとの両方に、上り通信用の共通チャネルを設定する共通チャネル設定部をさらに備え、
前記基地局の周辺の基地局では、前記第2受信タイミングが属する通信フレームでの当該第2受信タイミングと対となる送信タイミングには下り通信用の共通チャネルは設定されず、
前記送信部は、前記送信タイミングにおいて前記通知信号を送信する、基地局。 - 請求項8に記載の基地局が周辺基地局として配置された基地局であって、
前記周辺基地局からの信号を受信する受信部と、
前記受信部が前記周辺基地局における共通チャネルの信号を受信するタイミング以外に下り通信用の共通チャネルを設定する共通チャネル設定部と
を備え、
前記共通チャネル設定部は、
前記周辺基地局が、前記第1受信タイミングが属する通信フレームでの当該第1受信タイミングと対となる送信タイミングで送信した信号を前記受信部が受信する場合には、当該信号が受信されたタイミングよりも、前記第1受信タイミングに対する前記第2受信タイミングの遅延量だけ後の送信タイミングを、下り通信用の共通チャネルの設定対象として除外し、
前記周辺基地局が送信する前記通知信号を前記受信部が受信する場合には、当該通知信号が受信されたタイミングよりも前記遅延量だけ後の送信タイミングを、下り通信用の共通チャネルの設定対象として除外しない、基地局。 - 通信端末からの信号を基地局に中継するとともに、当該基地局からの信号を通信端末に中継する中継装置であって、
基地局と通信を行う基地局側通信部と、
通信端末と通信を行う端末側通信部と、
前記基地局側通信部及び前記端末側通信部を制御する制御部と
を備え、
前記基地局側通信部は、前記基地局から送信される、前記中継装置が中継する信号の通信チャネルを通知するための通知信号を受信し、
前記制御部は、前記中継装置が前記通知信号で通知される通信チャネルの信号を中継するように前記基地局側通信部及び前記端末側通信部を制御する、中継装置。 - 通信端末と中継装置を介して通信を行う基地局と、
通信端末からの信号を前記基地局に中継するとともに、前記基地局からの信号を通信端末に中継する中継装置と
を備え、
前記基地局は、
前記基地局が前記中継装置を介して通信する通信端末からの信号を受信する受信部と、
前記基地局が前記中継装置を介して通信する通信端末に対して通信チャネルを割り当てるチャネル割り当て部と、
前記基地局が中継装置を介して通信する通信端末に対して前記チャネル割り当て部が割り当てる通信チャネルを含むように、当該中継装置が中継する信号の通信チャネルを指定する中継チャネル指定部と、
前記中継チャネル指定部で指定される通信チャネルを前記中継装置に通知するための通知信号を、前記中継装置に送信する送信部と
を有し、
前記中継装置は、
前記基地局と通信を行う基地局側通信部と、
通信端末と通信を行う端末側通信部と、
前記基地局側通信部及び前記端末側通信部を制御する制御部と
を有し、
前記基地局側通信部は、前記基地局から送信される、前記中継装置が中継する信号の通信チャネルを通知するための通知信号を受信し、
前記制御部は、前記中継装置が前記通知信号で通知される通信チャネルの信号を中継するように前記基地局側通信部及び前記端末側通信部を制御する、通信システム。
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US13/579,484 US8885544B2 (en) | 2010-02-19 | 2011-02-18 | Base station, relay device and communication system |
CN2011800100381A CN102763475A (zh) | 2010-02-19 | 2011-02-18 | 基站、中继装置及通信系统 |
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JP2010-035412 | 2010-02-19 | ||
JP2010035412A JP5405348B2 (ja) | 2010-02-19 | 2010-02-19 | 基地局、中継装置及び通信システム |
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US (1) | US8885544B2 (ja) |
JP (1) | JP5405348B2 (ja) |
CN (1) | CN102763475A (ja) |
WO (1) | WO2011102446A1 (ja) |
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EP2606707A1 (en) * | 2010-08-16 | 2013-06-26 | Corning Cable Systems LLC | Remote antenna clusters and related systems, components, and methods supporting digital data signal propagation between remote antenna units |
WO2012115843A1 (en) | 2011-02-21 | 2012-08-30 | Corning Cable Systems Llc | Providing digital data services as electrical signals and radio-frequency (rf) communications over optical fiber in distributed communications systems, and related components and methods |
US10659163B2 (en) | 2014-09-25 | 2020-05-19 | Corning Optical Communications LLC | Supporting analog remote antenna units (RAUs) in digital distributed antenna systems (DASs) using analog RAU digital adaptors |
WO2016071902A1 (en) | 2014-11-03 | 2016-05-12 | Corning Optical Communications Wireless Ltd. | Multi-band monopole planar antennas configured to facilitate improved radio frequency (rf) isolation in multiple-input multiple-output (mimo) antenna arrangement |
WO2016075696A1 (en) | 2014-11-13 | 2016-05-19 | Corning Optical Communications Wireless Ltd. | Analog distributed antenna systems (dass) supporting distribution of digital communications signals interfaced from a digital signal source and analog radio frequency (rf) communications signals |
WO2016098109A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital interface modules (dims) for flexibly distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
WO2016098111A1 (en) | 2014-12-18 | 2016-06-23 | Corning Optical Communications Wireless Ltd. | Digital- analog interface modules (da!ms) for flexibly.distributing digital and/or analog communications signals in wide-area analog distributed antenna systems (dass) |
US10687309B2 (en) * | 2015-05-08 | 2020-06-16 | Texas Instruments Incorporated | Enhanced broadcast transmission in unslotted channel hopping medium access control |
JP7149513B2 (ja) * | 2018-06-21 | 2022-10-07 | パナソニックIpマネジメント株式会社 | 通信装置、通信システム |
CN111586800B (zh) * | 2020-04-29 | 2021-03-16 | 广州技象科技有限公司 | Unb中继系统及数据交互方法 |
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JP2001177464A (ja) * | 1999-12-20 | 2001-06-29 | Nec Corp | 無線中継装置 |
WO2007037636A2 (en) * | 2005-09-28 | 2007-04-05 | Lg Electronics Inc. | A method of identifying a space-time encoded signal in a wireless communication system |
JP2007195125A (ja) * | 2005-12-20 | 2007-08-02 | Japan Radio Co Ltd | 通信装置および通信方法 |
KR100756985B1 (ko) * | 2006-08-30 | 2007-09-07 | 삼성전자주식회사 | 광대역 무선통신 시스템에서 중계국을 선택하기 위한 장치및 방법 |
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JP2009239874A (ja) * | 2008-03-28 | 2009-10-15 | Maspro Denkoh Corp | 中継用パッシブアンテナシステム |
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US8737912B2 (en) * | 2008-08-12 | 2014-05-27 | Blackberry Limited | Enabling downlink transparent relay in a wireless communications network |
EP2182662B1 (en) * | 2008-10-31 | 2013-12-04 | Nokia Solutions and Networks GmbH & Co. KG | Method of and radio network for transmitting layered data to multiple receiving stations |
US8599782B2 (en) * | 2008-11-10 | 2013-12-03 | Lg Electronics Inc. | Method for performing a HARQ operation in a radio communications system, and method and apparatus for allocation of subframes |
WO2010113382A1 (ja) * | 2009-03-31 | 2010-10-07 | パナソニック株式会社 | 中継装置及び中継方法 |
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- 2011-02-18 US US13/579,484 patent/US8885544B2/en not_active Expired - Fee Related
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JP5405348B2 (ja) | 2014-02-05 |
US8885544B2 (en) | 2014-11-11 |
JP2011172118A (ja) | 2011-09-01 |
US20120307719A1 (en) | 2012-12-06 |
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