WO2011013448A1 - 基地局、通信システム、移動端末および中継装置 - Google Patents
基地局、通信システム、移動端末および中継装置 Download PDFInfo
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- WO2011013448A1 WO2011013448A1 PCT/JP2010/059853 JP2010059853W WO2011013448A1 WO 2011013448 A1 WO2011013448 A1 WO 2011013448A1 JP 2010059853 W JP2010059853 W JP 2010059853W WO 2011013448 A1 WO2011013448 A1 WO 2011013448A1
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- relay
- frequency
- link
- base station
- downlink
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
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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
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- 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
- H04B7/15557—Selecting relay station operation mode, e.g. between amplify and forward mode, decode and forward mode or FDD - and TDD mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
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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 a base station, a communication system, a mobile terminal, and a relay device.
- relay station In 3GPP (Third Generation Partnership Project), in order to improve the throughput at the cell edge, a technique using a relay device (relay station) has been actively studied.
- This relay apparatus receives and amplifies the signal transmitted from the base station in the downlink, and transmits the amplified signal to the mobile terminal.
- the relay apparatus can increase the signal-to-noise ratio as compared with the case where the signal is directly transmitted from the base station to the mobile terminal.
- the relay apparatus can keep the signal-to-noise ratio high by relaying the signal transmitted from the mobile terminal to the base station even in the uplink.
- Such relaying by the relay device is described in Non-Patent Document 1, for example.
- examples of the relay method by the relay device include an Amp-Forward type and a Decode-Forward type.
- the Amp-Forward type is a method in which a received signal is amplified and transmitted as an analog signal.
- the Amp-Forward type does not improve the signal-to-noise ratio, but has the advantage that the communication protocol does not need to be improved. Since the relay device has a feedback path between the transmission antenna and the reception antenna, the relay apparatus is designed not to oscillate.
- the Decode-Forward type converts the received signal into a digital signal by AD conversion, decodes the digital signal such as error correction, re-encodes the decoded digital signal, and converts the digital signal into an analog signal by DA conversion. In this method, an analog signal is amplified and transmitted. In the Decode-Forward type, the signal-to-noise ratio can be improved by the coding gain. Further, the relay apparatus can avoid oscillation of the feedback circuit between the transmission antenna and the reception antenna by storing the digital signal obtained by reception in the memory and transmitting the digital signal in the next time slot. Note that the relay device can avoid oscillation by changing the frequency instead of the time slot.
- LTE Long Term Evolution
- LTE-Advanced require a reduction in communication delay between users (for example, 50 ms or less).
- a relay device is provided between the base station and the mobile terminal, a delay occurs in the relay device, so the problem regarding delay becomes more important.
- the present invention has been made in view of the above problems, and an object of the present invention is to assign each link to a frequency-time block according to any one of a plurality of link assignment patterns having different delay characteristics. It is an object of the present invention to provide a new and improved base station, communication system, mobile terminal, and relay device that can be used.
- a base station a relay link between the base station and a relay device, and an access link between the relay device and a mobile terminal
- Allocation of a communication unit communicating with the mobile terminal via a relay Allocation of a communication unit communicating with the mobile terminal via a relay, an uplink of the relay link, a downlink of the relay link, an uplink of the access link, and a downlink of the access link to frequency-time blocks
- a base station including a selection unit that selects a pattern from a plurality of allocation patterns having different delay characteristics generated between the base station and the mobile terminal.
- the communication unit may receive information indicating an allocation pattern that the relay device can handle, and the selection unit may select an allocation pattern that the relay device can support from the plurality of allocation patterns.
- the selection unit may select the allocation pattern according to a delay characteristic required for communication between the base station and the mobile terminal.
- radio frame may be composed of a plurality of subframes, and each time slot of the frequency-time block may correspond to a subframe time slot.
- One radio frame is composed of a plurality of subframes composed of a plurality of slots, Each time slot of the frequency-time block may correspond to a slot time slot.
- the plurality of allocation patterns may include different frequency-time block times for the downlink of the relay link and the downlink of the access link, and the frequency-time block times of the uplink of the access link and the uplink of the relay link. And the frequency of the downlink of the relay link and the frequency of the downlink of the access link are different from each other, and the frequency of the uplink of the access link and the frequency of the uplink of the relay link are different from each other. Different allocation patterns may be included.
- the plurality of allocation patterns include: an allocation pattern in which the frequency of the frequency-time block of the uplink of the relay link, the downlink of the relay link, the uplink of the access link, and the downlink of the access link is the same, and the frequency is different. May be included.
- the plurality of allocation patterns are allocation patterns in which the frequency of the frequency-time block of the relay link uplink, the relay link downlink, the access link uplink, and the access link downlink is the same and different in time. May be included.
- the plurality of allocation patterns are different in time and frequency of the downlink of the relay link and the frequency-time block of the downlink of the access link, and the frequency-time block of the uplink of the access link and the uplink of the relay link May include allocation patterns having different times and frequencies.
- a mobile terminal, a relay device, a base station, a relay link between the base station and the relay device, and the A communication unit that communicates with the mobile terminal via an access link between a relay device and the mobile terminal; and an uplink of the relay link, a downlink of the relay link, an uplink of the access link, and the A base station comprising: a selection unit that selects an allocation pattern of a downlink of an access link to a frequency-time block from a plurality of allocation patterns having different delay characteristics generated between the base station and the mobile terminal;
- a communication system is provided.
- a mobile terminal including a relay link between a base station and a relay device, and between the relay device and the mobile terminal.
- a communication unit communicating with the mobile terminal via an access link, and a frequency-time of an uplink of the relay link, a downlink of the relay link, an uplink of the access link, and a downlink of the access link
- the base station having a selection unit for selecting an allocation pattern to the block from a plurality of allocation patterns having different delay characteristics generated between the base station and the mobile terminal
- a mobile terminal that communicates via the relay device is provided.
- a relay device a relay link between a base station and the relay device, and between the relay device and the mobile terminal.
- a communication unit that communicates with the mobile terminal via an access link, and a frequency of an uplink of the relay link, a downlink of the relay link, an uplink of the access link, and a downlink of the access link ⁇
- the communication between the base station and the mobile terminal having a selection unit that selects an allocation pattern to a time block from a plurality of allocation patterns having different delay characteristics generated between the base station and the mobile terminal
- a relay device is provided that relays according to an assignment pattern selected by a section.
- each link can be allocated to a frequency-time block according to any one of a plurality of link allocation patterns having different delay characteristics.
- FIG. 3 is a functional block diagram showing a configuration of a mobile terminal 20.
- FIG. 3 is a functional block diagram illustrating a configuration of a relay device 30.
- FIG. 2 is a functional block diagram showing a configuration of a base station 10.
- FIG. It is explanatory drawing which showed the allocation pattern 1 of each link. It is explanatory drawing which showed the allocation pattern 2 of each link. It is explanatory drawing which showed the allocation pattern 3 of each link.
- 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 mobile terminals 20A, 20B, and 20C as necessary.
- the mobile terminals 20A, 20B, and 20C are simply referred to as the mobile terminal 20 when it is not necessary to distinguish them.
- FIG. 1 is an explanatory diagram showing a configuration of a communication system 1 according to an embodiment of the present invention.
- a communication system 1 according to an embodiment of the present invention includes a plurality of base stations 10A, 10B, and 10C, a backbone network 12, a plurality of mobile terminals 20A, 20B, and 20C, Relay devices 30A and 30B.
- the plurality of base stations 10A, 10B, and 10C manage schedule information for communicating with the mobile terminals 20 existing in each radio wave reachable range. Then, the plurality of base stations 10A, 10B, and 10C communicate with the mobile terminal 20 existing in each radio wave reachable range according to the schedule information.
- the base station 10A manages frequency-time schedule information for communicating with the mobile terminal 20C existing within the radio wave reach of the base station 10A. Then, the base station 10A communicates with the mobile terminal 20C existing within the radio wave reachable range of the base station 10A according to the schedule information.
- the plurality of base stations 10A, 10B, and 10C can communicate with the mobile terminal 20 via the relay device 30 existing within each radio wave reachable range.
- the plurality of base stations 10A, 10B, and 10C manage schedule information for communication with the relay device 30 and schedule information for communication between the relay device 30 and the mobile terminal 20.
- the base station 10A manages the frequency-time schedule information for communicating with the relay device 30A existing within the radio wave reach of the base station 10A, and the relay device 30A and the mobile terminals 20A and 20B communicate with each other. Manage frequency-time schedule information. Then, the base station 10A communicates with the relay device 30A according to the schedule information.
- the frequency-time schedule management will be described with emphasis on an example in which the base station 10 performs the management, but the present invention is not limited to such an example.
- the frequency-time schedule management may be performed in cooperation between the base station 10 and the relay apparatus 30, or may be performed in cooperation with the base station 10, the relay apparatus 30, and the mobile terminal 20. May do.
- the plurality of base stations 10A, 10B, and 10C are connected via the backbone network 12.
- a plurality of base stations 10A, 10B, and 10C can exchange, for example, schedule information managed by each of them via the backbone network 12.
- the relay device 30 relays communication between the base station 10 and the mobile terminal 20 according to frequency-time schedule 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 mobile terminal 20 using the frequency-time according to the schedule information. . By performing such relaying, the relay device 30 can increase the signal-to-noise ratio compared to when the signal is directly transmitted from the base station 10 to the mobile terminal 20 near the cell edge.
- the relay device 30 relays the signal transmitted from the mobile terminal 20 to the base station 10 according to the frequency-time schedule information managed by the base station 10, thereby increasing the signal-to-noise ratio. Can keep.
- FIG. 1 shows an example in which only the relay device 30A exists in the cell provided by the base station 10A, a plurality of relay devices 30 may exist in the cell provided by the base station 10A.
- each link name is organized.
- FIG. 2 is an explanatory diagram showing each link in the communication system 1 according to the embodiment of the present invention.
- a direct communication path between the base station 10 and the mobile terminal 20 is referred to as a direct link.
- the direct link downlink is referred to as a direct downlink (Dd)
- the direct link uplink is referred to as a direct uplink (Du).
- the communication path between the base station 10 and the relay device 30 is referred to as a relay link, the downlink of this relay link is referred to as a relay downlink (Rd), and the uplink of the relay link is referred to as a relay uplink (R--). u).
- a communication path between the relay apparatus 30 and the base station 10 is referred to as an access link, a downlink of the access link is referred to as an access downlink (Ad), and an uplink of the access link is referred to as an access uplink (A ⁇ ). u).
- the mobile terminal 20 included in the communication system 1 communicates with the base station 10 directly or via the relay device 30 according to schedule information managed by the base station 10.
- Data transmitted and received by the mobile 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.
- FIG. 3 is an explanatory diagram showing a configuration example of a radio frame used in the communication system 1 according to the present embodiment.
- the length of each radio frame (Radio Frame) is 10 ms.
- Each radio frame is composed of 10 subframes # 0 to # 9 each having a length of 1 ms.
- Each subframe is composed of two 0.5 ms slots, and each 0.5 ms slot is composed of seven OFDM (orthogonal frequency division multiplexing) symbols.
- the fifth and sixth OFDM symbols in the first 0.5 ms slot included in subframes # 0 and # 5 are used for transmission of a reference signal for synchronization.
- the mobile terminal 20 performs cell search and synchronization processing based on this reference signal transmitted from the base station 10 or the relay station 30.
- the base station 10 allocates time in units of the above 0.5 ms slot for communication with the mobile terminal 20. Also, FDD (Frequency Division Duplex) and TDD (Time Division Duplex) are used to separate the uplink and the downlink. In the case of TDD, it is possible to select whether the subframe is used for the uplink or the downlink for each subframe.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- FIG. 4 is a functional block diagram showing the configuration of the mobile terminal 20.
- the mobile 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 mobile terminal 20 includes the plurality of antennas 220a to 220n as described above, it can perform MIMO (Multiple Input Multiple Output) communication and 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, a SINR (Signal to Interference plus Noise Ratio) acquisition unit 236, a transmission data generation unit 238, an encoder 240, a control unit 242, and a schedule information holding unit 244. And comprising.
- the synchronization unit 232 is supplied with the reference signal transmitted from the base station 10 or the relay device 30 from the AD / DA conversion unit 228, and performs synchronization processing of the radio frame based on the reference signal. Specifically, the synchronization unit 232 calculates the correlation between the reference signal and the known sequence pattern and detects the peak position of the correlation to synchronize the radio frame.
- 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.
- the SINR acquisition unit 236 acquires the SINR magnitude with the relay device 30 from the correlation of the reference signals obtained by the synchronization unit 232.
- each relay device 30 transmits a reference signal having one of a plurality of sequence patterns. For this reason, the SINR acquisition unit 236 can acquire the SINR for each relay device 30 based on the difference in the sequence pattern of the reference signal.
- the transmission data generation unit 238 receives information indicating the SINR for each relay device 30 from the SINR acquisition unit 236, generates transmission data including this information, and supplies the transmission data to the encoder 240.
- the encoder 240 encodes the transmission data supplied from the transmission data generation unit 238 and supplies the encoded transmission data to the AD / DA conversion unit 228.
- the encoding may include, for example, a MIMO transmission process and an OFDM modulation process.
- the control unit 242 controls transmission processing and reception processing in the mobile terminal 20 according to schedule information held in the schedule information holding unit 244. For example, the mobile terminal 20 performs transmission processing and reception processing using a frequency-time block indicated by the schedule information based on control by the control unit 242.
- the schedule information holding unit 244 holds schedule information managed by the base station 10. This schedule information indicates, for example, a frequency-time block used for the access downlink and a frequency-time block used for the access uplink.
- uplink and downlink schedule information is included in PDCH (Physical Downlink Control Channel) which is a downlink control channel.
- PDCH Physical Downlink Control Channel
- This PDCH is transmitted using the first to third OFDM symbols of the subframe assigned to the downlink in the radio frame.
- FIG. 5 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 mobile 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 mobile 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, and a schedule information holding unit 344.
- the synchronization unit 332 is supplied with the reference 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 reference signal. Specifically, the synchronization unit 332 calculates the correlation between the reference signal and the known sequence pattern, and synchronizes the radio frame by detecting the peak position of the correlation.
- 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 mobile 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 mobile terminal 20 obtained by the decoder 334. Then, under the control of the control unit 342, relay data addressed to the mobile terminal 20 is read from the buffer 338 to the encoder 340 in the transmission time of the access downlink to the mobile terminal 20. Similarly, relay data addressed to the base station 10 is read from the buffer 338 to the encoder 340 during the relay uplink transmission time to the base station 10 under the control of the control unit 342.
- Encoder 340 encodes the 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 control unit 342 controls the transmission process and the reception process in the relay device 30 according to the schedule information held in the schedule information holding unit 344.
- the relay device 30 performs transmission processing and reception processing using a frequency-time block indicated by the schedule information based on control by the control unit 342.
- the schedule information holding unit 344 holds schedule information managed by the base station 10. This schedule information indicates, for example, a frequency-time block used for each of the relay downlink, access downlink, access uplink, and relay uplink.
- FIG. 6 is a functional block diagram showing the configuration of the base station 10. As shown in FIG. 6, the base station 10 includes a plurality of antennas 120a to 120n, an analog processing unit 124, an AD / DA conversion unit 128, and a digital processing unit 130.
- Each of the plurality of antennas 120a to 120n receives a radio signal from the relay device 30 or the mobile terminal 20, acquires an electrical high-frequency signal, and supplies the high-frequency signal to the analog processing unit 124. Further, each of the plurality of antennas 120a to 120n transmits a radio signal to the relay device 30 or the mobile terminal 20 based on the high frequency signal supplied from the analog processing unit 124. Since the base station 10 includes the plurality of antennas 120a to 120n as described above, it can perform MIMO communication and diversity communication.
- the analog processing unit 124 converts high-frequency signals supplied from the plurality of antennas 120a to 120n into baseband signals by performing analog processing such as amplification, filtering, and down-conversion.
- the analog processing unit 124 converts the baseband signal supplied from the AD / DA conversion unit 128 into a high-frequency signal.
- the AD / DA conversion unit 128 converts the analog baseband signal supplied from the analog processing unit 124 into a digital format and supplies it to the digital processing unit 130.
- the AD / DA conversion unit 128 converts the digital baseband signal supplied from the digital processing unit 130 into an analog format and supplies the analog format to the analog processing unit 124.
- the digital processing unit 130 includes a decoder 134, a transmission data generation unit 138, an encoder 140, a control unit 142, a schedule information holding unit 144, an SINR holding unit 152, a relay device information holding unit 154, a scheduler 156, .
- the decoder 134, the encoder 140, and the like function as a communication unit for communicating with the relay device 30 and the mobile terminal 20 together with the plurality of antennas 120a to 120n, the analog processing unit 124, and the AD / DA conversion unit 128. .
- the decoder 134 decodes the baseband signal supplied from the AD / DA converter 128 to obtain received data.
- Decoding may include, for example, MIMO reception processing, OFDM demodulation processing, error correction processing, and the like.
- the transmission data generation unit 138 generates transmission data including schedule information scheduled by the scheduler 156. Note that the schedule information is included in the PDCH arranged at the head of the subframe as described above.
- the encoder 140 encodes the transmission data supplied from the transmission data generation unit 138 and supplies the encoded transmission data to the AD / DA conversion unit 128.
- the encoding may include, for example, a MIMO transmission process and an OFDM modulation process.
- the control unit 142 controls transmission processing and reception processing in the base station 10 according to schedule information held in the schedule information holding unit 144.
- the base station 10 performs transmission processing and reception processing using a frequency-time block indicated by the schedule information based on control by the control unit 142.
- the schedule information holding unit 144 holds the schedule information determined by the scheduler 156.
- the scheduler 156 (selection unit) schedules relay link communication with the relay device 30 and access link communication between the relay device 30 and the mobile terminal 20.
- the scheduler 156 separates resources for the relay downlink, access downlink, access uplink, and relay uplink by frequency and time from the viewpoint of interference avoidance.
- an allocation pattern in which resources can be separated by frequency and time will be described with reference to FIGS.
- FIG. 7 is an explanatory diagram showing an allocation pattern 1 for each link.
- a relay downlink (Rd) is assigned to a frequency-time block defined by frequency F2 ⁇ slot T1, and a frequency defined by frequency F2 ⁇ slot T2 is assigned.
- the access downlink (Ad) is assigned to the time block
- the access uplink (Au) is assigned to the frequency-time block defined by the frequency F1 ⁇ slot T1, and is defined by the frequency F1 ⁇ slot T2.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the frequency-time block to which the downlink is assigned is colored to distinguish it from the frequency-time block to which the uplink is assigned.
- the frequency-time block may be a resource block that is a minimum unit of link allocation or a group of resource blocks.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F2 and the slot T1.
- the relay device 30 receives the data transmitted via the relay downlink, holds the data in the buffer 338 as relay data, and then transmits the relay data to the mobile terminal 20 via the access downlink at the frequency F2 / slot T2. Send.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F1 / slot T1.
- the relay device 30 receives the data transmitted via the access uplink, holds the data as the relay data in the buffer 338, and then transmits the relay data to the base station 10 via the relay uplink at the frequency F1 / slot T2. Send.
- the uplink and the downlink are separated by frequency, and the relay link and the access link in the same direction are separated by time, so that interference between the links can be suppressed.
- FIG. 8 is an explanatory diagram showing an allocation pattern 2 for each link.
- the access downlink (Ad) is assigned to the frequency-time block defined by the frequency F2 ⁇ slot T1, and the frequency defined by the frequency F2 ⁇ slot T2 is assigned.
- the relay downlink (Rd) is assigned to the time block and the access uplink (Au) is assigned to the frequency-time block defined by the frequency F1 ⁇ slot T1 and defined by the frequency F1 ⁇ slot T2.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the relay device 30 transmits the relay data held in the buffer 338 to the mobile terminal 20 via the access downlink at the frequency F2 / slot T1. Further, the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F2 / slot T1.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F1 / slot T1.
- the relay device 30 receives the data transmitted via the access uplink, holds the data as the relay data in the buffer 338, and then transmits the relay data to the base station 10 via the relay uplink at the frequency F1 / slot T2. Send.
- FIG. 9 is an explanatory diagram showing an allocation pattern 3 for each link.
- the relay downlink (Rd) is allocated to the frequency-time block defined by the frequency F2 ⁇ slot T1, and the frequency defined by the frequency F1 ⁇ slot T2 is assigned.
- the access downlink (Ad) is assigned to the time block, and the access uplink (Au) is assigned to the frequency-time block defined by the frequency F1 ⁇ slot T1, and the frequency F2 ⁇ slot T2 is defined.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F2 / slot T1.
- the relay device 30 receives the data transmitted via the relay downlink, holds the data in the buffer 338 as relay data, and then transmits the relay data to the mobile terminal 20 via the access downlink at the frequency F1 / slot T2. Send.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F1 / slot T1.
- the relay device 30 receives the data transmitted via the access uplink, holds the data as the relay data in the buffer 338, and then transmits the relay data to the base station 10 via the relay uplink at the frequency F2 / slot T2. Send.
- the uplink and the downlink are separated by frequency, and the relay link and access link in the same direction are separated by both frequency and time, so that interference between the links can be suppressed.
- FIG. 10 is an explanatory diagram showing an allocation pattern 4 for each link.
- the relay downlink (Rd) is allocated to the frequency-time block defined by the frequency F2 ⁇ slot T1, and the frequency defined by the frequency F1 ⁇ slot T2 -
- the access downlink (Ad) is assigned to the time block
- the access uplink (Au) is assigned to the frequency-time block defined by the frequency F2-slot T2, and is defined by the frequency F1-slot T1.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F2-slot T1.
- the relay device 30 receives the data transmitted via the relay downlink, holds the data as relay data in the buffer 338, and then transmits the relay data to the mobile terminal 20 via the access downlink at the frequency F1-slot T2. Send.
- the relay device 30 transmits the relay data held in the buffer 338 to the base station 10 via the relay uplink at the frequency F1-slot T1. Also, the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F2-slot T2.
- the uplink and the downlink are separated by frequency, and the relay link and the access link in the same direction are separated by both frequency and time, so that interference between the links can be suppressed.
- FIG. 11 is an explanatory diagram showing an allocation pattern 5 for each link.
- the relay downlink (Rd) is allocated to the frequency-time block defined by the frequency F1-slot T1, and the frequency defined by the frequency F2-slot T1.
- the access downlink (Ad) is assigned to the time block and the access uplink (Au) is assigned to the frequency-time block defined by the frequency F1-slot T2, and is defined by the frequency F2-slot T2.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the relay link and the access link are separated by frequency. For this reason, the delay which arises between the downlink of a relay link and the downlink of an access link can be shortened not to a slot unit but to an OFDM symbol unit. Similarly, the delay that occurs between the uplink of the access link and the uplink of the relay link can be reduced not to the slot unit but to the OFDM symbol unit.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F1-slot T1. Then, the relay device 30 performs decoding, buffering, encoding, and transmission to the mobile terminal 20 via the access downlink of the data received via the relay downlink with a delay amount in units of OFDM symbols from the reception. F2-slot T1 is used. Note that the delay amount may be variable between one OFDM symbol and a plurality of OFDM symbols.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F1-slot T2. Then, the relay device 30 performs decoding, buffering, encoding, and transmission of the data received via the access uplink to the base station 10 via the relay uplink with a delay amount in units of OFDM symbols from the reception.
- the F2-slot T2 is used.
- the relay link and access link are separated by frequency (FDD), and the uplink and downlink are separated by time (TDD). Therefore, according to the allocation pattern 5, the delay between the base station 10 and the mobile terminal 20 is suppressed from the allocation patterns 1 to 4 that separate the relay link and the access link by time while suppressing interference between the links. Can be shortened.
- FIG. 12 is an explanatory diagram showing an allocation pattern 6 for each link.
- the relay downlink (Rd) is allocated to the frequency-time block defined by the frequency F1-slot T1, and the frequency defined by the frequency F2-slot T1.
- the access downlink (Ad) is assigned to the time block and the access uplink (Au) is assigned to the frequency-time block defined by the frequency F2-slot T2, and is defined by the frequency F1-slot T2.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the relay link and the access link are separated by frequency. For this reason, the delay which arises between the downlink of a relay link and the downlink of an access link can be shortened not to a slot unit but to an OFDM symbol unit. Similarly, the delay that occurs between the uplink of the access link and the uplink of the relay link can be reduced not to the slot unit but to the OFDM symbol unit.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F1-slot T1. Then, the relay device 30 performs decoding, buffering, encoding, and transmission to the mobile terminal 20 via the access downlink of the data received via the relay downlink with a delay amount in units of OFDM symbols from the reception. F2-slot T1 is used. Note that the delay amount may be variable between one OFDM symbol and a plurality of OFDM symbols.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F2-slot T2. Then, the relay device 30 performs decoding, buffering, encoding, and transmission of the data received via the access uplink to the base station 10 via the relay uplink with a delay amount in units of OFDM symbols from the reception. F1-slot T2 is used.
- the relay link and the access link are separated by frequency (FDD), and the uplink and the downlink are separated by both time and frequency (TDD). Therefore, according to the allocation pattern 6, the delay between the base station 10 and the mobile terminal 20 is suppressed from the allocation patterns 1 to 4 that separate the relay link and the access link by time while suppressing interference between the links. Can be shortened.
- FIG. 13 is an explanatory diagram showing an allocation pattern 7 for each link.
- the relay downlink (Rd) is allocated to the frequency-time block defined by the frequency F1-slot T1, and the frequency defined by the frequency F2-slot T1.
- the access downlink (Ad) is assigned to the time block
- the access uplink (Au) is assigned to the frequency-time block defined by the frequency F3-slot T1, and is defined by the frequency F4-slot T1.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the relay link and the access link are separated by frequency, and the uplink and downlink are also separated by frequency.
- the delay in the relay apparatus 30 can be shortened in units of OFDM symbols as in the allocation patterns 5 and 6, and the other end is used for the use of one of the uplink and the downlink. You don't have to wait.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F1-slot T1. Then, the relay device 30 performs decoding, buffering, encoding, and transmission to the mobile terminal 20 via the access downlink of the data received via the relay downlink with a delay amount in units of OFDM symbols from the reception. F2-slot T1 is used. Note that the delay amount may be variable between one OFDM symbol and a plurality of OFDM symbols.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F3-slot T1. Then, the relay device 30 performs decoding, buffering, encoding, and transmission of the data received via the access uplink to the base station 10 via the relay uplink with a delay amount in units of OFDM symbols from the reception. F4-slot T1 is used.
- FIG. 14 is an explanatory diagram showing an allocation pattern 8 for each link.
- the relay downlink (Rd) is assigned to the frequency-time block defined by the frequency F1-slot T1, and the frequency defined by the frequency F1-slot T2 is assigned.
- the access downlink (Ad) is assigned to the time block
- the access uplink (Au) is assigned to the frequency-time block defined by the frequency F1-slot T3, and is defined by the frequency F1-slot T4.
- a relay uplink (Ru) is assigned to the frequency-time block to be transmitted.
- the relay link and the access link are separated by time, and the uplink and downlink are also separated by time.
- the frequency to be used is small, the delay characteristic is deteriorated as compared with other allocation patterns.
- the base station 10 transmits data to the relay device 30 via the relay downlink at the frequency F1-slot T1.
- the relay device 30 receives the data transmitted via the relay downlink, holds the data as relay data in the buffer 338, and then transmits the relay data to the mobile terminal 20 via the access downlink at the frequency F1-slot T2. Send.
- the mobile terminal 20 transmits data to the relay device 30 via the access uplink at the frequency F1-slot T3.
- the relay device 30 receives the data transmitted via the access uplink, holds the data as relay data in the buffer 338, and then transmits the relay data to the base station 10 via the relay uplink at the frequency F1-slot T4. Send.
- the plurality of link assignment patterns are classified into the following four types.
- ⁇ Type A A type in which the uplink and downlink are separated by frequency, and the relay link and access link in the same direction are separated by time.
- Allocation patterns 1 to 4 correspond to type A.
- ⁇ Type B A type in which the uplink and downlink are separated by time, and the relay link and access link in the same direction are separated by frequency.
- Allocation patterns 5 and 6 correspond to type B.
- the allocation pattern 7 corresponds to type C.
- ⁇ Type D A type that separates uplink and downlink, and relay link and access link only by time.
- the allocation pattern 8 corresponds to type C.
- the assignment patterns belonging to each of the above types A to D have different delay characteristics as described in (assignment pattern 1) to (assignment pattern 8).
- type C has the best delay characteristics, and the delay characteristics deteriorate in the order of type B, type A, and type D.
- the frequency band to be used is the narrowest in type D, and widens in the order of type A, type B, and type C.
- the communication capability required by the relay device 30 differs depending on the allocation pattern. For example, in order to operate according to the allocation pattern 1, the relay device 30 needs to have a communication capability of simultaneously receiving the access link and the relay link and simultaneously transmitting the access link and the relay link. Further, in order to operate according to the allocation pattern 7, the relay device 30 needs to have a communication capability for simultaneously transmitting and receiving the access link and the relay link.
- the scheduler 156 performs appropriate scheduling according to the communication capability of the relay device 30 to be scheduled and the delay characteristics required with the mobile terminal 20.
- the scheduling by the scheduler 156 will be described together with the configurations of the SINR holding unit 152 and the relay device information holding unit 154.
- the SINR holding unit 152 holds the SINR for each relay device 30 notified from the mobile terminal 20.
- the relay device information holding unit 154 holds category information indicating the communication capability of the relay device 30 notified from the relay device 30. For example, category 1 indicates that it has a communication capability that operates only in accordance with allocation pattern 1, and category 2 indicates that it has a communication capability that operates in accordance with all allocation patterns 1-8.
- the scheduler 156 includes the SINR for each relay device 30 held in the SINR holding unit 152, the category information for each relay device 30 held in the relay device information holding unit 154, and the delay characteristics required between the mobile terminals 20 Schedule according to.
- a specific scheduling procedure example is shown below.
- the scheduler 156 selects the relay device 30 having the highest SINR as the relay device for communication with the mobile terminal 20 from the SINRs held for each relay device 30 held in the SINR holding unit 152.
- the scheduler 156 refers to the relay device information holding unit 154 to obtain category information of the selected relay device 30.
- the scheduler 156 selects an allocation pattern that satisfies a delay characteristic required for the mobile terminal 20 from among the allocation patterns that can be indicated by the category information.
- the scheduler 156 allocates each of the relay downlink, access downlink, access uplink, and relay uplink to the free frequency-time block of the radio frame according to the selected allocation pattern.
- schedule information indicating the frequency-time block to which each of the relay downlink, access downlink, access uplink, and relay uplink is assigned is held in the schedule information holding unit 144. Further, the schedule information is transmitted to the relay device 30 and the mobile terminal 20 selected in (1) above. As a result, the relay device 30 and the mobile terminal 20 can communicate according to the schedule information.
- the scheduler 156 may determine the delay characteristic required with the mobile terminal 20 according to, for example, the attribute of the transmission data. For example, when the transmission data is real-time competitive game data, the scheduler 156 may determine that the minimum delay amount is required and select the allocation pattern 7 having the best delay characteristics. Similarly, the scheduler 156 determines delay characteristics required for the mobile terminal 20 depending on whether the transmission data corresponds to audio data, still image data, video data, streaming data, download data, or the like. May be judged.
- FIG. 15 is an explanatory diagram showing an example of link assignment to each frequency-time block constituting a radio frame.
- link assignment to each frequency-time block in subframe # 0 is performed according to assignment pattern 7
- link assignment to each frequency-time block in subframes # 1 and # 2 is assigned pattern.
- 2 and assignment pattern 5 are performed.
- links are allocated to frequency-time blocks of other subframes according to any allocation pattern.
- FIG. 15 shows an example in which a subframe is a frequency-time block allocation unit, but a 0.5 ms slot may be a frequency-time block allocation unit.
- the scheduler 156 may change the link assignment to each frequency-time block for each radio frame.
- FIG. 16 is an explanatory view showing a modified example of the configuration of the radio frame by combining the allocation patterns.
- link allocation to each frequency-time block of subframe # 0 is performed according to allocation pattern 7
- each frequency-time block of frequency F1 of subframes # 1 to # 4 is performed according to the assignment pattern 8.
- the scheduler 156 may select the allocation pattern 8 for communication with the mobile terminal 20 having a relatively large allowable delay.
- the scheduler 156 selects an allocation pattern to be used for communication with the mobile terminal 20 and allocates each link to a free frequency-time block according to the selected allocation pattern. It is not limited to.
- the scheduler 156 may group the frequency-time blocks constituting the radio frame in advance according to a plurality of allocation patterns. In this case, the scheduler 156 may select an allocation pattern used for communication with the mobile terminal 20 and select a group of frequency-time blocks based on the allocation pattern as a communication resource with the mobile terminal 20.
- FIG. 17 is a sequence diagram showing the operation of the communication system 1 according to the present embodiment. As shown in FIG. 17, each relay apparatus 30 transmits category information indicating its own communication capability to the base station 10 (S404, S408). Each relay device 30 transmits a reference signal for synchronization at a predetermined timing (S412, S416).
- the synchronization unit 232 of the mobile terminal 20 performs synchronization processing based on the reference signal transmitted from the relay device 30, and the SINR acquisition unit 236 acquires SINR with the relay device 30 from the correlation value obtained in the synchronization processing. To do. Then, the mobile terminal 20 notifies the base station 10 of the SINR of each relay device 30 acquired by the SINR acquisition unit 236 (S420).
- the scheduler 156 of the base station 10 selects a relay device that relays communication with the mobile terminal 20 based on the SINR of each relay device 30.
- the scheduler 156 refers to the category information of the relay device 30A, and selects an allocation pattern that can be supported by the relay device 30A and satisfies the required delay characteristics (S424).
- the scheduler 156 allocates each of the relay downlink, access downlink, access uplink, and relay uplink to the free frequency-time block of the radio frame according to the selected allocation pattern (S426). Then, the schedule information indicating the frequency-time block to which each link is assigned is transmitted to the relay device 30A together with the downlink data (S428), and the relay device 30A relays the schedule information and the downlink data to the mobile terminal 20. (S432).
- the mobile terminal 20 transmits uplink data to the relay device 30A according to the schedule information, and the relay device 30A relays the uplink data to the base station 10 according to the schedule information (S440).
- the base station 10 sets the link allocation pattern for communicating with the mobile terminal 20 according to the communication capability of the relay device 30 and the delay characteristics required with the mobile terminal 20. You can choose appropriately. In other words, according to the present embodiment, it is possible to dynamically respond to requests for delays that differ for each channel, and therefore it is possible to improve the total performance related to delay.
- 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.
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Abstract
Description
前記周波数-時間ブロックの各々の時間帯は、スロットの時間帯に対応してもよい。
1.通信システムの概要
2.移動端末の構成
3.中継装置の構成
4.基地局の構成
5.通信システムの動作
6.まとめ
まず、図1~図3を参照し、本発明の実施形態による通信システム1について概略的に説明する。
以上、図1~図3を参照し、本実施形態による通信システム1について概略的に説明した。続いて、図4を参照し、本実施形態による通信システム1に含まれる移動端末20の構成を説明する。
次に、図5を参照し、中継装置30の構成を説明する。
続いて、図6~図16を参照し、基地局10の構成を説明する。
図7は、各リンクの割当てパターン1を示した説明図である。図7に示したように、割当てパターン1においては、周波数F2・スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F2・スロットT2で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F1・スロットT1で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F1・スロットT2で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。なお、図7~図16においては、ダウンリンクが割り当てられる周波数-時間ブロックに色を付することにより、アップリンクが割り当てられる周波数-時間ブロックと区別している。また、周波数-時間ブロックは、リンク割当ての最小単位であるリソースブロックであっても、リソースブロックのグループであってもよい。
図8は、各リンクの割当てパターン2を示した説明図である。図8に示したように、割当てパターン2においては、周波数F2・スロットT1で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F2・スロットT2で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F1・スロットT1で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F1・スロットT2で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
図9は、各リンクの割当てパターン3を示した説明図である。図9に示したように、割当てパターン3においては、周波数F2・スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F1・スロットT2で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F1・スロットT1で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F2・スロットT2で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
図10は、各リンクの割当てパターン4を示した説明図である。図10に示したように、割当てパターン4においては、周波数F2・スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F1-スロットT2で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F2-スロットT2で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F1-スロットT1で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
図11は、各リンクの割当てパターン5を示した説明図である。図11に示したように、割当てパターン5においては、周波数F1-スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F2-スロットT1で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F1-スロットT2で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F2-スロットT2で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
図12は、各リンクの割当てパターン6を示した説明図である。図12に示したように、割当てパターン6においては、周波数F1-スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F2-スロットT1で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F2-スロットT2で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F1-スロットT2で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
図13は、各リンクの割当てパターン7を示した説明図である。図13に示したように、割当てパターン7においては、周波数F1-スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F2-スロットT1で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F3-スロットT1で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F4-スロットT1で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
図14は、各リンクの割当てパターン8を示した説明図である。図14に示したように、割当てパターン8においては、周波数F1-スロットT1で定義される周波数-時間ブロックにリレーダウンリンク(R-d)が割当てられ、周波数F1-スロットT2で定義される周波数-時間ブロックにアクセスダウンリンク(A-d)が割当てられ、周波数F1-スロットT3で定義される周波数-時間ブロックにアクセスアップリンク(A-u)が割当てられ、周波数F1-スロットT4で定義される周波数-時間ブロックにリレーアップリンク(R-u)が割当てられる。
上記のように、複数のリンク割当てパターンが存在する。また、複数のリンク割当てパターンは、以下の4タイプに分類される。
・タイプA
アップリンクとダウンリンクを周波数で分離し、同一方向のリレーリンクとアクセスリンクを時間で分離するタイプ。割当てパターン1~4がタイプAに該当する。
・タイプB
アップリンクとダウンリンクを時間で分離し、同一方向のリレーリンクとアクセスリンクを周波数で分離するタイプ。割当てパターン5および6がタイプBに該当する。
・タイプC
アップリンクとダウンリンク、およびリレーリンクとアクセスリンクを周波数のみで分離するタイプ。割当てパターン7がタイプCに該当する。
・タイプD
アップリンクとダウンリンク、およびリレーリンクとアクセスリンクを時間のみで分離するタイプ。割当てパターン8がタイプCに該当する。
以上説明したように、複数の周波数-時間の割当てパターンが存在する。また、割当てパターンにより、遅延特性や、中継装置30が必要とする通信特性が異なる。このため、スケジューラ156は、スケジューリングの対象の中継装置30の通信能力や、移動端末20との間で要求される遅延特性に応じて適切なスケジューリングを行う。以下、スケジューラ156によるスケジューリングについて、SINR保持部152、および中継装置情報保持部154の構成と併せて説明する。
(2)スケジューラ156は、中継装置情報保持部154を参照し、選択した中継装置30のカテゴリー情報を得る。
(3)スケジューラ156は、カテゴリー情報の示す対応可能な割当てパターンのうちで、移動端末20との間で要求される遅延特性を満たす割当てパターンを選択する。
(4)スケジューラ156は、選択した割当てパターンに従い、リレーダウンリンク、アクセスダウンリンク、アクセスアップリンクおよびリレーアップリンクの各々を無線フレームの空き周波数-時間ブロックに割り当てる。
以上、図6~図16を参照して基地局10の構成を説明した。続いて、図17を参照し、本実施形態による通信システム1の動作を説明する。
以上説明したように、本実施形態による基地局10は、中継装置30の通信能力や、移動端末20との間で要求される遅延特性に応じ、移動端末20と通信するためのリンク割当てパターンを適切に選択することができる。すなわち、本実施形態によれば、チャネルごとに異なる遅延に対する要求に動的に対応することができるため、遅延に関するトータルパフォーマンスを向上することが可能である。
Claims (12)
- 基地局であって、
前記基地局と中継装置との間のリレーリンク、および前記中継装置と移動端末との間のアクセスリンク、を介して前記移動端末と通信する通信部と;
前記リレーリンクのアップリンク、前記リレーリンクのダウンリンク、前記アクセスリンクのアップリンク、および前記アクセスリンクのダウンリンク、の周波数-時間ブロックへの割当てパターンを、前記基地局と前記移動端末との間で生じる遅延特性が異なる複数の割当てパターンから選択する選択部と;
を備える、基地局。 - 前記通信部は、前記中継装置が対応可能な割当てパターンを示す情報を受信し、
前記選択部は、前記複数の割当てパターンから、前記中継装置が対応可能な割当てパターンを選択する、請求項1に記載の基地局。 - 前記選択部は、前記基地局と前記移動端末の間の通信に要求される遅延特性に応じて前記割当てパターンを選択する、請求項2に記載の基地局。
- 1の無線フレームが複数のサブフレームにより構成され、
前記周波数-時間ブロックの各々の時間帯は、サブフレームの時間帯に対応している、請求項3に記載の基地局。 - 1の無線フレームが、複数スロットからなる複数のサブフレームにより構成されており、
前記周波数-時間ブロックの各々の時間帯は、スロットの時間帯に対応している、請求項3に記載の基地局。 - 前記複数の割当てパターンは、
前記リレーリンクのダウンリンクと前記アクセスリンクのダウンリンクの周波数-時間ブロックの時間が異なり、前記アクセスリンクのアップリンクと前記リレーリンクのアップリンクの周波数-時間ブロックの時間が異なる割当てパターンと、
前記リレーリンクのダウンリンクと前記アクセスリンクのダウンリンクの周波数-時間ブロックの周波数が異なり、前記アクセスリンクのアップリンクと前記リレーリンクのアップリンクの周波数-時間ブロックの周波数が異なる割当てパターンと、
を含む、請求項3に記載の基地局。 - 前記複数の割当てパターンは、前記リレーリンクのアップリンク、前記リレーリンクのダウンリンク、前記アクセスリンクのアップリンク、および前記アクセスリンクのダウンリンクの周波数-時間ブロックの時間が同一で周波数が異なる割当てパターンを含む、請求項6に記載の基地局。
- 前記複数の割当てパターンは、前記リレーリンクのアップリンク、前記リレーリンクのダウンリンク、前記アクセスリンクのアップリンク、および前記アクセスリンクのダウンリンクの周波数-時間ブロックの周波数が同一で時間が異なる割当てパターンを含む、請求項7に記載の基地局。
- 前記複数の割当てパターンは、前記リレーリンクのダウンリンクと前記アクセスリンクのダウンリンクの周波数-時間ブロックの時間および周波数が異なり、前記アクセスリンクのアップリンクと前記リレーリンクのアップリンクの周波数-時間ブロックの時間および周波数が異なる割当てパターンを含む、請求項8に記載の基地局。
- 移動端末と;
中継装置と;
基地局であって、
前記基地局と前記中継装置との間のリレーリンク、および前記中継装置と前記移動端末との間のアクセスリンク、を介して前記移動端末と通信する通信部、および、
前記リレーリンクのアップリンク、前記リレーリンクのダウンリンク、前記アクセスリンクのアップリンク、および前記アクセスリンクのダウンリンク、の周波数-時間ブロックへの割当てパターンを、前記基地局と前記移動端末との間で生じる遅延特性が異なる複数の割当てパターンから選択する選択部と、
を有する基地局と;
を備える、通信システム。 - 移動端末であって、
基地局と中継装置との間のリレーリンク、および前記中継装置と前記移動端末との間のアクセスリンク、を介して前記移動端末と通信する通信部、および、前記リレーリンクのアップリンク、前記リレーリンクのダウンリンク、前記アクセスリンクのアップリンク、および前記アクセスリンクのダウンリンク、の周波数-時間ブロックへの割当てパターンを、前記基地局と前記移動端末との間で生じる遅延特性が異なる複数の割当てパターンから選択する選択部、を有する前記基地局と、前記選択部により選択された割当てパターンに従って前記中継装置を介して通信する、移動端末。 - 中継装置であって、
基地局と前記中継装置との間のリレーリンク、および前記中継装置と前記移動端末との間のアクセスリンク、を介して前記移動端末と通信する通信部、および、前記リレーリンクのアップリンク、前記リレーリンクのダウンリンク、前記アクセスリンクのアップリンク、および前記アクセスリンクのダウンリンク、の周波数-時間ブロックへの割当てパターンを、前記基地局と前記移動端末との間で生じる遅延特性が異なる複数の割当てパターンから選択する選択部、を有する前記基地局と前記移動端末との通信を、前記選択部により選択された割当てパターンに従って中継する、中継装置。
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CN201080032841.0A CN102474855B (zh) | 2009-07-27 | 2010-06-10 | 基站、通信系统、移动终端和中继装置 |
RU2012102041/07A RU2012102041A (ru) | 2009-07-27 | 2010-06-10 | Базовая станция, система связи, мобильное оконечное устройство и ретрансляционное устройство |
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MX2012000922A (es) | 2012-03-16 |
AU2010276918B2 (en) | 2015-07-09 |
IN2012DN00595A (ja) | 2015-06-12 |
CA2767880C (en) | 2018-10-23 |
ES2660540T3 (es) | 2018-03-22 |
JP5251776B2 (ja) | 2013-07-31 |
EP3331303B1 (en) | 2020-11-18 |
CN104507171B (zh) | 2018-05-11 |
US20200099440A1 (en) | 2020-03-26 |
EP2461636A4 (en) | 2015-09-09 |
CN104507171A (zh) | 2015-04-08 |
US20120113888A1 (en) | 2012-05-10 |
US20150171952A1 (en) | 2015-06-18 |
JP2011030017A (ja) | 2011-02-10 |
CA2767880A1 (en) | 2011-02-03 |
BR112012001343A2 (pt) | 2016-03-29 |
US8989077B2 (en) | 2015-03-24 |
EP3331303A1 (en) | 2018-06-06 |
KR20120035924A (ko) | 2012-04-16 |
EP2461636B1 (en) | 2018-01-10 |
CN102474855A (zh) | 2012-05-23 |
ZA201200230B (en) | 2012-05-30 |
CN102474855B (zh) | 2015-01-14 |
US10530460B2 (en) | 2020-01-07 |
AU2010276918A2 (en) | 2012-02-16 |
RU2012102041A (ru) | 2013-07-27 |
EP2461636A1 (en) | 2012-06-06 |
AU2010276918A1 (en) | 2012-02-16 |
US11211995B2 (en) | 2021-12-28 |
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