WO2014034679A1 - Système de communication sans fil et station de base - Google Patents

Système de communication sans fil et station de base Download PDF

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Publication number
WO2014034679A1
WO2014034679A1 PCT/JP2013/072903 JP2013072903W WO2014034679A1 WO 2014034679 A1 WO2014034679 A1 WO 2014034679A1 JP 2013072903 W JP2013072903 W JP 2013072903W WO 2014034679 A1 WO2014034679 A1 WO 2014034679A1
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Prior art keywords
base station
resource
transmission
resource information
station
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PCT/JP2013/072903
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English (en)
Japanese (ja)
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大介 実川
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富士通株式会社
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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
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present disclosure relates to a wireless communication system and a base station.
  • LTE LongLTerm Evolution
  • 3GPP has already developed LTE-Advanced IV (Release IV 10) with greatly expanded functions.
  • active discussions are taking place to further expand the functionality in the next release, Release 11.
  • FFR frequency reuse
  • relative narrowband transmission power (Relative Narrow-band Tx Power: RNTP) is defined as an information element exchanged on the interface between base stations (X2 interface).
  • RNTP indicates a frequency resource (Resource Block: RB) of transmission power exceeding a threshold value by “1”, and indicates RB of transmission power (including transmission power zero) below the threshold value by “0”.
  • the base station indicates an RB whose transmission power is equal to or less than the threshold value by RNTP and declares it to the base station of the neighboring cell.
  • the base station can know the RB whose transmission power in the adjacent cell is equal to or less than the threshold.
  • the user scheduler in the base station of the adjacent cell allocates the RB to a mobile station (User Equipment: UE) at the adjacent cell boundary. By such FFR, interference with the mobile station is suppressed.
  • UE User Equipment
  • CoMP Coordinated Multiplex Point
  • JT joint transmission
  • the UE In normal cellular communication, the UE receives a signal from a cell adjacent to the connected cell as an interference signal.
  • a plurality of base stations cooperate to transmit a downlink shared channel (PDSCH) based on the same data to a specific UE.
  • PDSCH downlink shared channel
  • the UE can receive not only a signal from the connected cell but also a signal from an adjacent cell as a desired signal. For this reason, inter-cell interference is reduced.
  • Fig. 2 shows the CoMP JT system model.
  • base stations there are forms such as a macro base station, a pico base station, and RRH (Remote Radio Head), but in FIG. 2, they are represented as TP (Transmission Point) without distinguishing the transmission stations.
  • TP Transmission Point
  • ing. 2 is a transmitting station (TP) of a connected cell with which the UE exchanges control signals and the like, and transmits a data signal s1 to the UE.
  • TP2 is a transmitting station (TP) of the coordinated cell, and includes a scheduler connected to the scheduler of TP1 via the X2 interface.
  • the scheduler of TP2 transmits the same data signal s1 as the data signal s1 transmitted from TP1 to the UE in cooperation with TP1.
  • a cooperative cell selection method for example, based on the downlink received power measurement value (Reference Signal Received Power: RSRP) fed back from the UE, a cell that falls within the RSRP threshold with the connected cell is selected.
  • RSRP Reference Signal Received Power
  • JP 2010-178237 A JP 2011-49617 A JP 2011-87009 A JP 2011-151779 A JP 2011-155501 A JP 2010-283632 A
  • the purpose of the present disclosure is to provide a technology capable of realizing inter-base station cooperative transmission while suppressing the expansion range of existing information elements.
  • the first base station is A receiving device that receives resource information about a plurality of resources that can be allocated to the mobile station, and predetermined data used to interpret the resource information; Used for inter-base station cooperative transmission selected based on the resource information when the predetermined data has a first value that means that the resource information indicates a resource that can be used for inter-base station cooperative transmission And a control device that performs processing for performing inter-base station cooperative transmission with the second base station using the selected resource to the second base station.
  • the second base station When the second base station notifies the first base station of resources that can be used for inter-base station cooperative transmission, the second base station sends the resource information and the predetermined data having the first value to the first base station. Means that when transmitting a resource whose transmission power is equal to or less than a threshold to the first base station, the resource information and the resource information indicate a resource whose transmission power is equal to or less than the threshold.
  • the mobile station is a wireless communication system including a receiving device capable of receiving signals transmitted from the first base station and the second base station by coordinated transmission between base stations.
  • inter-base station cooperative transmission can be realized while suppressing the expansion range of existing information elements.
  • FIG. 1 shows a usage example of the control information RNTP.
  • FIG. 2 shows a CoMP JT system model. It is explanatory drawing in case the value of the RNTP replacement instruction
  • FIG. 4 is a diagram illustrating a configuration example of a mobile station (UE) applied to the embodiment.
  • FIG. 5 is a diagram illustrating a configuration example of a base station that can be used as a base station (TP1) of a connected cell and a base station (TP2) of a cooperative cell (neighboring cell) in the embodiment.
  • FIG. 6 is a sequence diagram illustrating an example of processing (cooperative transmission between base stations) in the embodiment.
  • FIG. 7 is a diagram for explaining the types of DL-CoMP.
  • FIG. 8 is an explanatory diagram of an RNTP replacement instruction according to the second embodiment.
  • FIG. 9 is a sequence diagram illustrating a processing example (operation example) of CoMP JT according to the second embodiment.
  • FIG. 10 is a sequence diagram illustrating a processing example (operation example) of CoMP CB according to the third embodiment.
  • FIG. 11 is a sequence diagram illustrating a processing example (operation example) of CoMP CS according to the fourth embodiment.
  • FIG. 12 is a sequence diagram illustrating a processing example (operation example) of CoMP CS (SSPS) according to the fifth embodiment.
  • FIG. 13 is a flowchart illustrating a processing example of the base station TP1.
  • FIG. 14 is a flowchart illustrating a processing example of the base station TP2 (cooperative cell).
  • FIG. 15 is a sequence diagram illustrating a processing example (operation example) of the centralized control type CoMP CS according to the seventh embodiment.
  • FIG. 16 is a flowchart showing a processing example of the base station TP1 in the sequence (centralized control CoMP CS) shown in FIG.
  • FIG. 17 is a flowchart showing a processing example in each of the base station TP2 and the base station TP3 in the sequence (centralized control CoMP CS) shown in FIG.
  • FIG. 18 is a flowchart showing a processing example of the base station TP4 in the sequence (centralized control CoMP CS) shown in FIG.
  • FIG. 19 is a sequence diagram illustrating a processing example (operation example) of intermittent CoMP CS using the interpretation of method 2.
  • FIG. 20 is a flowchart illustrating processing of the base station TP1 in intermittent CoMP CS according to the eighth embodiment.
  • FIG. 21 is a flowchart showing processing of the base station TP2 in intermittent CoMP CS according to the eighth embodiment.
  • Embodiment 1 provides a method for efficiently exchanging information on resources that can be used for CoMP (cooperative transmission between base stations) between base stations.
  • the base station reserves a frequency resource (RB) for CoMP (that is, in an unallocated state) and notifies the neighboring base station of information on the RB. This initiates a procedure for combined transmission (JT).
  • RB frequency resource
  • JT combined transmission
  • the RNTP can indicate an RB with limited transmission power, but an unallocated (zero transmission power) RB Cannot be shown. Therefore, new control information (RNTP replacement instruction) is provided and exchanged between base stations. Based on the RNTP replacement instruction notified by the neighboring base stations, the base station replaces the RNTP information with information on resources that can be used for CoMP transmission.
  • the RNTP replacement instruction is a flag having a binary value of “0” or “1”.
  • the RNTP is an example of resource information regarding a plurality of resources that can be allocated to the mobile station, and the RNTP replacement instruction is an example of predetermined data used for interpreting the resource information, and the first value (“1”) and the first value It has a value of 2 (“0”).
  • FFR partial frequency reuse
  • the resource information (RB) that can be used for CoMP transmission is transmitted to the base station of the neighboring cell only by adding a control information element (RNTP replacement instruction) of a small size (1 bit). You can be notified.
  • RNTP replacement instruction a control information element
  • the bit value indicating the RNTP replacement instruction may be opposite to the above.
  • the number of bits for indicating the first and second values is not limited to one bit, and may be two or more bits.
  • FIG. 4 is a diagram illustrating a configuration example of a mobile station (UE) applied to the embodiment.
  • FIG. 4 shows, as an example, a configuration of a UE in a mobile communication system in which an orthogonal frequency division multiple access (OFDMA) scheme is applied to a radio access scheme.
  • OFDMA orthogonal frequency division multiple access
  • a UE 10 includes a radio (RF) transmission / reception circuit 11, a DSP (Digital Signal Processor) 12 that functions as a part of a baseband processing unit, and an LSI (Large Scale Integrated) that functions as a part of a baseband processing unit. circuit) 13.
  • RF radio
  • DSP Digital Signal Processor
  • LSI Large Scale Integrated
  • the RF transmission / reception circuit 11 manages processing related to a radio (RF) signal.
  • the RF transceiver circuit 11 includes a reception RF circuit (wireless receiver) 15 connected to the reception antenna 14 and a transmission RF circuit (wireless transmitter) 17 connected to the transmission antenna 16.
  • the reception RF circuit 15 connected to the reception antenna 14 is an example of a reception device included in the mobile station.
  • the DSP 12 is an example of a processor, and the processor can include a CPU.
  • the DSP 12 loads a program stored in a storage device (auxiliary storage device) (not shown) into the main storage device (main memory) and executes it.
  • the DSP 12 performs fast Fourier transform (FFT) processing 18, channel estimation processing 19, control signal demodulation processing 20, reference signal received power (RSRP) calculation processing 21, and uplink control signal.
  • FFT fast Fourier transform
  • RSRP reference signal received power
  • the LSI 13 is an example of an integrated circuit, and includes a data signal demodulation circuit 23 that performs data signal demodulation processing.
  • Each process executed by the DSP 12 can be realized by using one or more integrated circuits such as an LSI, an ASIC (Application Specific Specific Integrated Circuit), or a programmable logic device such as an FPGA.
  • the reception RF circuit performs radio frequency-to-baseband conversion, quadrature demodulation, and analog-digital (A / D) conversion on a signal (downlink received signal) from the base station (TP) received by the receiving antenna 14. .
  • FFT processing 18 FFT timing detection, CP (Cyclic prefix) removal, and FFT are performed on the received signal (output signal of reception RF circuit 15). Moreover, in the channel estimation process 18, the reference signal for every base station (TP) is extracted from the received signal after FFT (the signal generated by the FFT process 18). Next, the cross-correlation between the extracted reference signal and the known reference signal of each base station is calculated. As a result, a channel estimation value of the radio channel represented by a complex number is obtained for each base station.
  • RSRP calculation processing 21 calculates the RSRP of each base station.
  • a control signal is extracted from the received signal after FFT (the signal generated by the FFT process 18).
  • control information (resource allocation information) is restored from the control signal by performing channel compensation, data demodulation, and error correction decoding using the channel estimation value for the control signal.
  • the data signal demodulation circuit 23 extracts the data signal from the received signal after FFT (the signal generated by the FFT process 18) based on the resource allocation information obtained by the demodulation process 20. Further, the demodulation circuit 23 restores information bits from the data signal by performing channel compensation, data demodulation, and error correction decoding using the channel estimation value obtained by the channel estimation processing 19.
  • a control signal is generated by encoding, data modulation, or the like with respect to control information including RSRP of each base station.
  • the transmission RF circuit 17 performs conversion from baseband to radio frequency by performing digital-analog (D / A) conversion and quadrature modulation on the control signal.
  • the radio frequency signal is transmitted from the transmission antenna 16 as an upstream transmission signal.
  • FIG. 5 shows a configuration example of the base station TP1 of the connected cell that exchanges signals with the UE 10 shown in FIG. 4 and the base station TP2 of the cooperative cell located around the connected cell. Since the base station TP1 and the base station TP2 have the same configuration, the configuration of the base station TP1 will be described.
  • “Base station” means a downlink transmission station, and includes, for example, a macro base station, a pico base station, an RRH, and the like.
  • the base station TP1 includes an RF transmission / reception circuit 31, a DSP 32 functioning as a baseband processing unit, and a wired interface circuit (wired I / F) 33.
  • the RF transmission / reception circuit 31 manages processing related to a radio (RF) signal.
  • the RF transceiver circuit 31 includes a reception RF circuit (wireless receiver) 35 connected to the reception antenna 34 and a transmission RF circuit (wireless transmitter) 37 connected to the transmission antenna 36.
  • the DSP 32 is an example of a processor, and the processor can include a CPU.
  • the DSP 32 loads a program stored in a storage device (auxiliary storage device) (not shown) into the main storage device (main memory) and executes it.
  • the DSP 32 performs an uplink control signal demodulation process 38, a cooperative transmission control process 39, a process (scheduling) as a scheduler 40, an RNTP information generation process 41, a data signal generation process 42, and a control signal.
  • Generation processing 43, reference signal generation processing 44, physical channel multiplexing processing 45, and inverse fast Fourier transform (IFFT) processing 46 are executed.
  • Each process executed by the DSP 32 can be realized by using one or more integrated circuits such as IC, LSI, and ASIC, or a programmable logic device such as FPGA.
  • the wired I / F 33 is connected to the wired I / F 33 of the base station TP2 via a wired interface.
  • the DSP 32 and the RF transmission / reception circuit 31 in the base station TP2 are not shown.
  • the reception RF circuit 35 performs radio frequency-to-baseband conversion, orthogonal demodulation, and A / D conversion on the uplink received signal from the UE 10 (FIG. 4).
  • the uplink control signal demodulation process 38 an uplink control signal demodulation process is performed, and control information (RSRP of each cell) is extracted.
  • RNTP information generation process 41 setting of RNTP and RNTP replacement instruction is performed.
  • scheduler 40 allocation of frequency resources to UEs, selection of transmission parameters, and the like are performed.
  • the wired I / F 33 performs data transfer (transfer of RNTP and RNTP replacement instruction, UE data, etc.) to and from the base station TP2 of the cooperative cell.
  • each physical channel is frequency-multiplexed.
  • IFFT processing 46 executes IFFT on the signal multiplexed by multiplexing processing 45, and CP is added to the signal obtained by IFFT.
  • the transmission RF circuit 37 performs D / A conversion and quadrature modulation on the signal to which the CP is added. Thereby, the conversion from the baseband to the radio frequency is performed.
  • the radio signal generated in this way is transmitted from the transmission antenna 36 as a downlink transmission signal.
  • FIG. 6 is a sequence diagram illustrating a processing example in the first embodiment.
  • the base station TP1 of the connected cell of the UE 10 and the base station TP2 which is a neighboring base station transmit a downlink (DL) reference signal (pilot signal) to the UE 10 ( ⁇ 1> in FIG. 6).
  • DL downlink
  • pilot signal pilot signal
  • the UE 10 measures the RSRP of each cell using the reference signal received from the base stations TP1 and TP2 of the connected cell ( ⁇ 2> in FIG. 6). Specifically, the DSP 12 of the UE 10 measures the RSRP of each cell using the reference signal. Specifically, the DSP 12 calculates a channel estimation value from the correlation between the known reference signal and the received reference signal by the channel estimation processing 19. Furthermore, the DSP 12 measures RSRP by averaging the power value of the received reference signal over time by the RSRP calculation process 21. Further, the DSP 12 generates an uplink control signal including an RSRP measurement result by the generation process 22. The transmission RF circuit 17 generates a radio signal (uplink transmission signal) of the uplink control signal and transmits it from the transmission antenna 16 to the base station TP1 ( ⁇ 3> in FIG. 6).
  • the base station TP1 receives the uplink transmission signal of the UE 10 as an uplink control signal, and the uplink control signal is demodulated by the demodulation process 38 of the DSP 32. Further, the DSP 32 determines a cooperation target base station for the UE 10 based on the RSRP measurement result included in the uplink control signal by the cooperative transmission control process 39 ( ⁇ 4> in FIG. 6). In the example illustrated in FIG. 6, the base station TP2 is determined as a cooperation target.
  • the coordinated transmission control processing 39 sets, for example, that some resources (RB) are not used for transmission when the amount of data traffic under the cell of the own station is small. Such an RB is referred to as a “no transmission RB”.
  • the value corresponding to the non-transmission RB in RNTP is set to “0”, and the value of the RNTP replacement instruction is set to “1” ( ⁇ 5> in FIG. 6). ).
  • the base station TP2 reserves the CoMP RB for CoMP JT based on the information on the CoMP RB received from the base station TP1, and updates the RNTP (FIG. 6 ⁇ 9>). Specifically, the DSP 32 sets the value of the RB in the RNTP corresponding to the CoMP RB to “1” by the RNTP information generation process 41. With such a setting, it is possible to prevent a base station of a neighboring cell from misinterpreting that “the non-transmission RB can be used for CoMP” in the next RNTP transmission.
  • the base station TP2 transmits a notification indicating that cooperation is possible (that is, the CoMP RB notified from the base station TP1 is reserved) to the base station TP1 by the cooperative transmission control processing 39 (FIG. 6). ⁇ 10>).
  • the coordinated transmission control processing 39 transmits data for the UE 10 transmitted by CoMP JT, control information (transmission parameters such as a modulation scheme), and the like. Is transferred to the base station TP2 through the wired I / F 33 ( ⁇ 11> in FIG. 6).
  • the base station TP1 and the base station TP2 perform user scheduling of the UE 10 that transmits by CoMPJT based on the exchanged CoMP RB information (FIG. 6 ⁇ 12>, ⁇ 13>).
  • the PDSCH is transmitted by CoMP JT (FIG. 6 ⁇ 14>, ⁇ 15>). Thereby, the same data is transmitted from the base station TP1 and the base station TP2.
  • the base station TP1 monitors the channel state for the UE 10 used for CoMP JT transmission based on the regularly reported RSRP, and serves as the base station of the cooperative cell that performs CoMP JT for the UE 10 If it is determined that TP2 is inappropriate, a notification of cancellation of cooperation is transmitted to the base station TP2 via the wired I / F 33 ( ⁇ 16> in FIG. 6).
  • the DSP 32 is information indicating that the RNTP has a resource (RB) whose original transmission power is equal to or less than a threshold, that is, each RB.
  • the corresponding value (0 or 1) is interpreted as a value indicating whether or not the transmission power is less than or equal to the threshold value.
  • the base station TP1 assigns an RB having a value of “0” to the UE located at the cell boundary with the base station TP2.
  • the CoMP JT is transmitted by transmitting the RNTP in which the value of the free RB (RB usable for CoMP) is set to 0 and the RNTP replacement instruction “1” to the neighboring cells. It is possible to inform the base station of the neighboring cell of the resource information that can be used.
  • Embodiment 2 Next, Embodiment 2 will be described. Since the configuration of the second embodiment has common points with the configuration of the first embodiment, differences will be mainly described, and description of common points will be omitted.
  • FIG. 7 is a diagram for explaining the types of DL-CoMP.
  • FIG. 7A illustrates the joint transmission (JT) described in the first embodiment.
  • JT joint transmission
  • DPS Dynamic Point Selection
  • C of FIG. 7 shows coordinated beamforming (CB).
  • CB coordinated beamforming
  • BF beam forming
  • CoMP coordinated beamforming
  • data transmission is performed from one cell
  • other cells cooperative cells
  • beam forming that is Null (no interference) for the UE of the cell that performs data transmission.
  • (D) of FIG. 7 shows coordinated scheduling (CS).
  • CS coordination of scheduling levels is performed between cells performing CoMP. That is, data transmission is performed from one cell, and other cells (cooperative cells) perform transmission muting so as not to interfere with UEs of cells that perform data transmission. Muting avoids data transmission. According to CS, the interference with the UE is reduced by stopping transmission from the cooperative cell.
  • FIG. 8 is an explanatory diagram of an RNTP replacement instruction according to the second embodiment.
  • the RNTP replacement instruction represents an RB that can be used for FFR
  • the RNTP replacement instruction is “1”
  • it is possible to represent an unassigned RB that is, an RB that can be reserved for CoMP in accordance with the convenience (situation) of neighboring cells.
  • the RNTP replacement instruction is treated as invalid data, and RNTP indicates the original meaning.
  • FIG. 9 is a sequence diagram illustrating a processing example of CoMP JT according to the second embodiment.
  • FIG. 9 illustrates a processing example when the base station TP1 (cell 1) and the base station TP2 (cell 2) perform CoMP JT on the UE1 under the base station TP1, as in the first embodiment. ing.
  • the base station TP1 serving TP: serving base station
  • serving TP serving base station
  • DL downlink
  • the UE1 measures RSRP of each cell using reference signals received from base stations TP1 and TP2 of the connected cell (FIG. 9 ⁇ 2>). Specifically, the DSP 12 of the UE1 measures the RSRP of each cell using the reference signal. Specifically, the DSP 12 calculates a channel estimation value from the correlation between the known reference signal and the received reference signal by the channel estimation processing 19. Furthermore, the DSP 12 measures RSRP by averaging the power value of the received reference signal over time by the RSRP calculation process 21. Further, the DSP 12 generates an uplink control signal including an RSRP measurement result by the uplink control signal generation process 22. The transmission RF circuit 17 generates a radio signal (uplink transmission signal) of the uplink control signal and transmits it from the transmission antenna 16 to the base station TP1 ( ⁇ 3> in FIG. 9).
  • the base station TP1 receives the uplink transmission signal of the UE1 as an uplink control signal, and the uplink control signal is demodulated by the uplink control signal demodulation process 38 of the DSP 32. Further, the DSP 32 determines a cooperation target base station for the UE 1 based on the RSRP measurement result included in the uplink control signal by the coordinated transmission control process 39 ( ⁇ 4> in FIG. 9). In the example shown in FIG. 9, the base station TP2 is determined as a cooperation target (cooperative cell).
  • the coordinated transmission control process 39 determines that some resources (RB) are not used for transmission (see FIG. 9 ⁇ 5>). Such an RB is referred to as a “no transmission RB”.
  • RB4 and RB5 are set to no-transmission RB.
  • the values of RB4 and RB5 corresponding to the non-transmission RB in RNTP are set to “0”, and the value of the RNTP replacement instruction is set to “1” (FIG. 9 ⁇ 6>).
  • the base station TP1 applies (requests) a reservation for the CoMP JT RB (RB5 in the example of FIG. 9) to the base station TP2 using the wired I / F 33 (FIG. 9 ⁇ 10>).
  • the reservation application includes the identification information of RB5 as CoMP JT RB information.
  • the base station TP2 reserves the CoMP JT RB (RB5) for the CoMP JT based on the information of the CoMP JT RB received from the base station TP1 ( ⁇ 11> in FIG. 9).
  • the base station TP2 transmits a notification indicating that cooperation is possible (that is, the CoMP JT RB (RB5) notified from the base station TP1 has been reserved) to the base station TP1 by the coordinated transmission control processing 39. (FIG. 9 ⁇ 12>).
  • the base station TP1 receives a notification indicating that cooperation is possible from the base station TP2.
  • the base station TP2 updates the RNTP (FIG. 9 ⁇ 13>). Specifically, the DSP 32 sets the value of the RB in the RNTP corresponding to the CoMP RB to “1” by the RNTP information generation process 41. With such a setting, it is possible to prevent a base station of a neighboring cell from misinterpreting that “the non-transmission RB can be used for CoMP” in the next RNTP transmission.
  • UE1 measures channel state information (Channel State Information: CSI) ( ⁇ 14> in FIG. 9). That is, the UE 1 obtains a channel quality index (Channel Quality Indicator: CQI), a precoding matrix index (Precoding Matrix Indicator: PMI), and a rank index (Rank Index: RI), and bases CSI including CQI, PMI, and RI.
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Indicator
  • RI rank index
  • the data is transmitted to the station TP1 ( ⁇ 15> in FIG. 9).
  • the UE1 measures not only the CSI related to the base station TP1 of the connected cell but also the CSI related to the base station of a neighboring cell that can be a coordinated cell specified by the control signal of the higher layer, for example, and transmits the measured CSI.
  • the base station TP1 performs scheduling of the UE 1 that performs data transmission by CoMP JT using the information on the reserved RB (RB5) obtained from the base station TP2 and the CSI obtained from the UE 1 ( ⁇ 16> in FIG. 9). .
  • the base station TP1 transfers the data for UE1 transmitted by CoMP JT and the control information (transmission parameters such as a modulation scheme) to the base station TP2 through the wired I / F 33 by the coordinated transmission control processing 39 (see FIG. 9 ⁇ 17>).
  • the control information includes at least the above-described PMI and Modulation-and-Coding Scheme (MCS: combination of modulation scheme and channel coding rate).
  • the base station TP2 schedules the UE 1 using the control information obtained from the base station TP1 with respect to RB5 reserved for CoMP JT ( ⁇ 18> in FIG. 9). Thereafter, the base station TP1 and the base station TP2 transmit the PDSCH by JT using RB5 (FIG. 9, ⁇ 19>, ⁇ 20>). Data for UE1 is mapped to the PDSCH. Thereby, the same data is transmitted from the base station TP1 and the base station TP2.
  • the base station TP1 monitors the channel state for the UE1 used for CoMP JT transmission based on the RSRP reported periodically. If it is determined that the base station TP2 is unsuitable as a base station of a cooperative cell that performs CoMP JT for the UE 1, it applies to the base station TP2 via the wired I / F 33 to cancel the reservation of the JT RB ( FIG. 9 ⁇ 21>). In response to the application from the base station TP1, the base station TP2 updates the RNTP for canceling the reservation of the RB 5 ( ⁇ 22> in FIG. 9).
  • the base station TP2 notifies the neighboring cell (base station TP1) of RB information that can be reserved for CoMP in response to an RNTP replacement instruction.
  • the base station TP1 applies to the base station TP2 for an RB reservation to be transmitted in JT to the subordinate UE.
  • the base station TP2 reserves an RB for JT for the application. That is, the base station TP2 permits transmission of data by JT to UEs under the base station TP1. Then, JT can be executed in the reserved RB (RB5).
  • the base station TP1 determines the RB for CoMP based on the RNTP replacement instruction “1” and RNTP supplied from each of the plurality of cooperative TPs. This modification can also be applied to the third, fourth, fifth, and eighth embodiments described later.
  • Embodiment 3 Next, Embodiment 3 will be described. Since the configuration of the third embodiment has common points with the configurations of the first and second embodiments, differences will be mainly described, and description of common points will be omitted.
  • a certain cell base station TP1 executes CoMP CB with a cooperative cell (TP2) selected from among neighboring cells will be described.
  • Embodiment 3 Since the configurations of the UE and the base station (transmitting station: TP) in Embodiment 3 are the same as those in Embodiment 1 (FIGS. 4 and 5), description thereof is omitted. In addition, regarding the interpretation of RNTP based on the RNTP replacement instruction, the interpretation described in the second embodiment (FIG. 8) is applied.
  • FIG. 10 is a sequence diagram illustrating a processing example (operation example) of CoMP CB according to the third embodiment.
  • the processes or operations from ⁇ 1> to ⁇ 16> in FIG. 10 are almost the same as the processes or operations from ⁇ 1> to ⁇ 16> in FIG.
  • the sequence of FIG. 10 since CoMP CB is performed, it differs from the second embodiment (FIG. 9) in the following points.
  • the base station TP2 reserves the CB RB (RB5) in response to the reservation application from the base station TP1 ( ⁇ 11> in FIG. 10). That is, the base station TP2 permits the application of beam forming so as not to cause an interference wave for the UE1 based on the PMI for the UE1 under the base station TP1 in order to perform transmission to the UE2 under the base station TP2. .
  • the base station TP1 transmits, as control information, the PMI related to the base station TP2 reported by the UE1 to the base station TP2 (FIG. 10 ⁇ 17>), and the base station TP2 transmits the base station in the RB5 based on the PMI of the UE1. Scheduling including beam forming for transmitting data to UE2 under station TP2 is performed ( ⁇ 18> in FIG. 10).
  • the base station TP1 transmits the PDSCH including data for the UE1 using the RB5 ( ⁇ 19> in FIG. 10).
  • base station TP2 transmits PDSCH including data for UE2 using RB5 ( ⁇ 20> in FIG. 10).
  • PDSCH transmission to UE2 is performed by beam forming such that the radio wave from base station TP2 does not become an interference wave for UE1 (becomes Null). Thereby, the interference with respect to UE1 is reduced.
  • the third embodiment it is possible to make a reservation application for the RB for CoMP (RB for CB) using the non-transmission RB selected using the RNTP replacement instruction, and CoMP CB using the reserved RB (RB5). Can be implemented.
  • a form similar to the above is also possible. For example, as a breakdown of CSI when UE1 performs CSI measurement and reporting (FIG. 10 ⁇ 14> to ⁇ 15>), in addition to PMI corresponding to a precoding matrix that increases reception quality for itself, UE1 itself Therefore, a PMI corresponding to a precoding matrix that lowers the reception quality may be included. Then, the base station TP1 may transmit to the base station TP2 a PMI whose reception quality is low for the base station TP2 reported by the UE1 as control information ( ⁇ 17> in FIG. 10). By using the precoding matrix corresponding to this PMI, the base station TP2 transmits PDSCH including data for UE2 ( ⁇ 20> in FIG. 10), thereby reducing interference with UE1.
  • Embodiment 4 Next, Embodiment 4 will be described. Since the configuration of the fourth embodiment has common points with the configurations of the first to third embodiments, differences will be mainly described, and description of common points will be omitted.
  • a certain cell base station TP1
  • TP2 cooperative cell
  • the configurations of the UE and the base station (transmitting station: TP) in the fourth embodiment have the same configurations (FIGS. 4 and 5) as those in the first embodiment, description thereof will be omitted.
  • the interpretation of RNTP based on the RNTP replacement instruction the interpretation described in the second embodiment (FIG. 8) is applied.
  • FIG. 11 is a sequence diagram illustrating a processing example (operation example) of CoMP CS according to the fourth embodiment.
  • the processes or operations from ⁇ 1> to ⁇ 16> in FIG. 11 are almost the same as the processes or operations from ⁇ 1> to ⁇ 16> in FIG.
  • the sequence of FIG. 11 differs from the second embodiment (FIG. 9) in the following points because CoMP CS is performed.
  • the base station TP2 reserves the RB for CS (RB5) in response to the reservation application from the base station TP1 ( ⁇ 11> in FIG. 11). That is, in order to execute CoMP CS, the base station TP2 permits to stop transmission (muting) for the UE1 under the control of the base station TP1.
  • the base station TP1 does not transmit data or control information to the base station TP2 after scheduling ( ⁇ 16> in FIG. 11). This is because it is not necessary to provide information for data transmission in order to cooperate by performing muting.
  • the base station TP1 transmits the PDSCH including data for the UE1 using the RB5 (FIG. 11 ⁇ 19>).
  • the base station TP2 performs muting ( ⁇ 20> in FIG. 11). Thereby, the interference with respect to UE1 is reduced.
  • the operations related to the reservation cancellation of the CoMP RB (CS RB) performed in FIGS. 11 ⁇ 21> and ⁇ 22> are the same as the operations illustrated in ⁇ 21> and ⁇ 22> in FIG.
  • CoMP CS differs from FFR in that advanced inter-cell coordination with muting application and permission is performed.
  • Embodiment 5 Next, Embodiment 5 will be described. Since the configuration of the fifth embodiment has common points with the configurations of the first and second embodiments, differences will be mainly described, and description of common points will be omitted.
  • a certain cell base station TP1 performs a semi-static point selection (SSPS) which is a type of CoMP CS and a cooperative cell (TP2) selected from neighboring cells.
  • SSPS semi-static point selection
  • TP2 a type of CoMP CS
  • TP2 cooperative cell
  • FIG. 12 is a sequence diagram illustrating a processing example (operation example) of CoMP CS (SSPS) according to the fifth embodiment.
  • the processes or operations from ⁇ 1> to ⁇ 15> in FIG. 10 are almost the same as the processes or operations from ⁇ 1> to ⁇ 15> in FIG.
  • the sequence of FIG. 12 differs from the second embodiment (FIG. 9) in the following points because SSPS is performed.
  • the base station TP2 reserves the SSPS RB (RB5) in response to the reservation application from the base station TP1 ( ⁇ 11> in FIG. 12). That is, the base station TP2 permits the SSPS to be applied for data transmission for the UE1 under the base station TP1.
  • the base station TP1 determines a transmission point for transmitting data to the UE1 from the base station TP1 and the base station TP2.
  • the base station TP2 is determined as a transmission point ( ⁇ 16A> in FIG. 12).
  • the base station TP1 transmits data and control information to the base station TP2 (FIG. 12 ⁇ 17>), and the base station TP2 performs scheduling for transmitting data to the UE1 (FIG. 12 ⁇ 18>).
  • base station TP2 transmits PDSCH containing the data for UE1 using RB5 (FIG. 12 ⁇ 20>).
  • the base station TP1 performs muting ( ⁇ 20> in FIG. 12). Subsequent processing is almost the same as that of the second embodiment, and thus description thereof is omitted.
  • the processes after ⁇ 16> shown in FIG. 11 are executed.
  • one of the base station TP1 and the base station TP2 sends data to the UE 1 according to the CSI (channel state information) of the UE 1.
  • the UE 1 can receive data from a transmitting station with a good wireless environment.
  • FIG. 13 is a flowchart illustrating a processing example of the base station TP1.
  • the process shown in FIG. 13 can be executed as the cooperative transmission control process 39 of the DSP 32, for example.
  • the process shown in FIG. 13 shows a process example common to JT, CB, and CS directed to the execution of JT, CB, and CS.
  • the processing shown in FIG. 13 is started upon reception of the RSRP report ( ⁇ 3>) in each of FIGS.
  • the DSP 32 determines whether or not the candidate (TP2) of the cooperative transmission station (cooperative TP) satisfies the CoMP application condition. If the downlink received power RSRP of the base station TP1 and the downlink received power RSRP of the base station TP2 that is a cooperative TP candidate satisfy the following equation (1), the DSP 32 determines that the candidate satisfies the application condition.
  • the DSP 32 determines whether or not the CoMP RB is being reserved in the base station TP2. At this time, if the CoMP RB is being reserved (03, Yes), the processing in FIG. 13 ends. On the other hand, if the CoMP RB is not being reserved (03, No), the process proceeds to 04.
  • the DSP 32 determines whether the RNTP replacement instruction from the base station TP2 is “1” or “0”. If the RNTP replacement instruction is “0” (04, 0), the processing in FIG. 13 ends. On the other hand, if the RNTP replacement instruction is “1” (04, 1), the process proceeds to 05.
  • the DSP 32 determines whether or not there is a CoMP RB indicated by the RNTP of the base station TP2. That is, it is determined whether or not there is an RB for which “0” is set in RNTP. If there is no RB for CoMP (05, none), the processing in FIG. 13 ends. On the other hand, if there is a CoMP RB (05, present), the process proceeds to 06.
  • the DSP 32 determines the RB (RB5 in each example of FIGS. 9 to 12) to be used for CoMP from the RB set to “0” (RB4 and RB5 in each example of FIGS. 9 to 12). Then, the base station TP2 applies for the determined RB reservation.
  • the processes 03 to 06 correspond to the processes ⁇ 9> and ⁇ 10> in FIGS. 9 to 12, respectively.
  • the DSP 32 determines whether the response from the base station TP2 to the reservation application is “reservation impossible” or “reserved”. If the response is “reservation not possible”, the warping of FIG. 13 ends. On the other hand, if the response is “reserved” of the RB (RB5) related to the application, the process proceeds to 08.
  • the DSP 32 notifies the reserved RB (RB5) to the scheduler 40 and ends the process. Thereafter, CoMP using RB5 is scheduled for the UE by the DSP 32 functioning as the scheduler 40.
  • the DSP 32 determines whether or not the CoMP RB is being reserved in the base station TP2. At this time, if the CoMP RB is not being reserved (09, No), the processing in FIG. 13 ends. In contrast, if the CoMP RB is being reserved (09, Yes), the process proceeds to 10.
  • the DSP 32 applies to the base station TP2 to cancel the CoMP RB reservation. Thereafter, the process of FIG. 13 ends.
  • the process 10 corresponds to the process ⁇ 21> in each of FIGS.
  • the base station TP1 when the CoMP RB is not reserved for the determined cooperative TP (TP2), the base station TP1 refers to the RNTP replacement instruction and the RNTP of the cooperative TP (TP2), and determines the RB for CoMP. Apply for a reservation. Further, if the CoMP RB is reserved even though the cooperative TP (TP2) no longer satisfies the CoMP application conditions, the base station TP1 reserves the CoMP RB for the cooperative TP (TP2). Apply for cancellation. In addition, when the DSP 32 obtains information on the reserved RB notified from the cooperative TP (TP2), the DSP 32 reflects the information on scheduling of data transmission to the UE by the scheduler. ⁇ Processing at TP2> FIG.
  • FIG. 14 is a flowchart illustrating a processing example of the base station TP2.
  • the process shown in FIG. 14 is executed as the cooperative transmission control process 39 in the DSP 32 (FIG. 5), for example.
  • the process shown in FIG. 14 is a process common among JT, CB, and CS.
  • the DSP 32 determines whether there is RB application information for CoMP from the peripheral TP (base station TP1). If there is a reservation application (001 exists), the process proceeds to 002. If there is no reservation application (001, none), the process proceeds to 005.
  • the DSP 32 determines the type of RB application information for CoMP. If the type of application information is “reserved”, the process proceeds to 003. If the type of application information is “reservation cancellation”, the process proceeds to 008.
  • the DSP 32 determines whether or not the RB related to the reservation application from the reservation application source (base station TP1) can be reserved. At this time, if the RB cannot be reserved (003, No), the process proceeds to 005. If the RB can be reserved (003, Yes), the process proceeds to 004.
  • the DSP 32 reserves the CoMP RB (RB5) according to the reservation application, and notifies the base station TP1 that the CoMP RB (RB5) has been reserved.
  • the processing from 001 to 003 corresponds to the processing of ⁇ 11> in each of FIGS. 9 to 12, and the processing of 004 corresponds to the processing of ⁇ 12>.
  • the DSP 32 cancels the reservation state of the reserved CoMP RB in response to the reservation cancellation application.
  • the DSP 32 determines whether or not a non-transmission RB can be set for RBs other than the reserved RB. At this time, if the non-transmission RB cannot be set (005, No), the process proceeds to 007. On the other hand, when the non-transmission RB can be set (005, Yes), the DSP 32 sets the non-transmission RB (006). For example, when the traffic amount at the base station TP2 is small, the non-transmission RB can be set without affecting the system capacity. However, in the case of CS, an RB reserved for the peripheral TP may be set as a non-transmission RB.
  • the process of 006 corresponds to the process of ⁇ 5> in each of FIGS.
  • the DSP 32 notifies the RNTP information generation process 41 of the RNTP update information. That is, the DSP 32 notifies the RNTP generation processing 41 of the RNTP update information that has determined the status of RB reservation or reservation cancellation for the peripheral TP and the status of no-transmission RB setting. In the case of CS, only the setting status of the non-transmission RB may be reflected in the RNTP update information.
  • the DSP 32 performs an RNTP generation process 41 and performs an RNTP update process based on the RNTP update information.
  • the process of 007 corresponds to the update process of ⁇ 6>, ⁇ 13>, and ⁇ 22> in each of FIGS.
  • each of the base station TP1 and the base station TP2 reserves and reserves RBs for different types of CoMP according to a common processing flow regardless of the type of CoMP (JT, CB, CS). Release can be performed.
  • Embodiment 7 Next, Embodiment 7 will be described. Since the configuration of the seventh embodiment has common points with the configurations of the first and second embodiments, differences will be mainly described, and description of common points will be omitted.
  • the central control station base station TP4 centrally controls CoMP CS between a plurality of cells (base stations TP1, TP2, TP3).
  • the base station TP4 is an example of a “control station”.
  • FIG. 15 is a sequence diagram illustrating a processing example (operation example) of the centralized control type CoMP CS according to the seventh embodiment.
  • Each of the base station TP1 serving as the serving base station of the UE1, and the base station TP2 and the base station TP3 forming the neighboring cells of the base station TP1 transmit a downlink reference signal (DL reference signal) to the UE1 (FIG. 15 ⁇ 1>).
  • DL reference signal downlink reference signal
  • the UE1 performs RSRP measurement (FIG. 15 ⁇ 2>) and reports RSRP to base station TP1 (FIG. 15 ⁇ 3>).
  • the base station TP1 determines, for example, the base station TP2 and the base station TP3 as the cooperative TP based on the RSRP report. Then, the base station TP1 applies (requests) the reservation of the CS RB to the base station TP4 ( ⁇ 10> in FIG. 15).
  • the base station TP2 determines a non-transmission RB (for example, determines RB4 and RB5) (FIG. 15 ⁇ 5>) and updates the RNTP (reflects the non-transmission RB) in the same manner as in the second embodiment. (Fig. 15 ⁇ 6>). Then, RNTP and RNTP replacement instruction “1” are transmitted to the base station TP4 ( ⁇ 7> in FIG. 15).
  • the base station TP3 determines the non-transmission RB (for example, RB2 and RB3) (FIG. 15 ⁇ 5A>), and updates the RNTP (reflects the non-transmission RB) (FIG. 15 ⁇ 6A >). Then, RNTP and RNTP replacement instruction “1” are transmitted to the base station TP4 ( ⁇ 7A> in FIG. 15).
  • the base station TP4 transmits the resource adjustment result to the base station TP1, the base station TP2, and the base station TP3 ( ⁇ 10B> in FIG. 15).
  • UE1 measures CSI (FIG. 15 ⁇ 14>) and reports CSI to base station TP1 (FIG. 15 ⁇ 16>).
  • the base station TP1 performs scheduling for data transmission to the UE1 by the RB4 based on the CSI. Thereafter, the base station TP1 transmits the PDSCH including data for the UE1 using the RB4 (FIG. 15 ⁇ 19>).
  • the base station TP2 and the base station TP3 perform muting of the reserved RB RB4 (FIG. 15 ⁇ 20>, ⁇ 20A>).
  • Such transmission stop of the base station TP2 and the base station TP3 suppresses interference with the UE1.
  • the base station TP1 applies to the base station TP4 to cancel the reservation of the RB for CS when the application condition of the cooperative TP is not satisfied (FIG. 15 ⁇ 21>).
  • the base station TP4 cancels the reservation of RB4 according to the reservation cancellation application ( ⁇ 22> in FIG. 15).
  • the base station TP4 notifies the base station TP1, the base station TP2, and the base station TP3 of the release of RB4 as a resource adjustment result ( ⁇ 23> in FIG. 15).
  • Each of the base station TP2 and the base station TP3 updates the RNTP (reflects a non-transmission RB) upon reception of the resource adjustment result (FIG. 15 ⁇ 24>, ⁇ 24A>).
  • the base station TP1 applies to the base station TP4 corresponding to the centralized control station for RB reservation that applies muting of neighboring cells to the subordinate UE1.
  • the base station TP4 notifies each of the base station TP1, the base station TP2, and the base station TP3 of the resource (RB4) adjusted based on the RNTP of the neighboring cells (the base station TP2 and the base station TP3 in FIG. 15) of the application source TP. To do. Then, CoMP CS is executed using the notified RB.
  • FIG. 16 is a flowchart showing a processing example of the base station TP1 in the sequence (centralized control CoMP CS) shown in FIG.
  • the process of FIG. 16 is performed as the cooperative transmission control process 39 of the DSP 32 of the base station TP1, for example.
  • the DSP 32 is an example of a “first control device”.
  • the DSP 32 determines whether or not the candidates (TP2, TP3) of the cooperative transmission station (cooperative TP) satisfy the CoMP application condition. If the downlink received power RSRP of the base station TP1 and the downlink received power RSRP of the base station TP2 that is a cooperative TP candidate satisfy the following equation (1), the DSP 32 determines that the candidate satisfies the application condition.
  • the DSP 32 determines whether or not the CoMP RB is being reserved in the base station TP2 and the base station TP3. At this time, if the CoMP RB is being reserved (23, Yes), the processing in FIG. 16 ends. On the other hand, if the CoMP RB is not being reserved (23, No), the process proceeds to 24.
  • the DSP 32 applies to the centralized control station (base station TP4) for reservation of CoMP RB (CS RB). At this time, information of the base station TP2 and the base station TP3 is supplied to the base station TP4 as the cooperative TP.
  • the DSP 32 determines whether the response from the base station TP4 to the reservation application is “reserved” or “reserved not possible”. If the response is “reservation impossible”, the processing in FIG. 16 ends. On the other hand, if the response is “reserved”, the process proceeds to 26.
  • the DSP 32 notifies the reserved RB (RB4) to the scheduler 40, and ends the process. Thereafter, CS (data transmission) using RB4 is scheduled for the UE1 by the DSP 32 functioning as the scheduler 40.
  • the process 26 corresponds to the process ⁇ 16> shown in FIG.
  • the DSP 32 determines whether the base station TP2 and the base station TP3 are reserving CoMP (CS) RBs. At this time, if the CoMP RB is not being reserved (No, 27), the processing in FIG. 16 ends. On the other hand, if the CoMP RB is being reserved (27, Yes), the process proceeds to 28.
  • CS CoMP
  • the DSP 32 requests the base station TP4 to cancel the reservation of the RB for CoMP (CS). Thereafter, the process of FIG. 16 ends.
  • the process 28 corresponds to the process ⁇ 21> in FIG.
  • the base station TP1 when the RB for CS is not reserved for the determined cooperative TP (TP2, TP3), the base station TP1 refers to the RNTP replacement instruction and the RNTP of the cooperative TP (TP2, TP3). Apply for reservation of CS RB to base station TP4. Further, the base station TP1 reserves the CS RB for the base station TP4 when the CS RB is reserved even though the cooperative TP (TP2, TP3) does not satisfy the CS application condition. Apply for cancellation.
  • FIG. 17 is a flowchart illustrating a processing example in each of the base station TP2 and the base station TP3.
  • the process shown in FIG. 17 is executed as the cooperative transmission control process 39 in the DSP 32 (FIG. 5), for example.
  • the DSP 32 is an example of a “second control device”.
  • the DSP 32 determines whether or not there is a resource adjustment result ( ⁇ 10B> in FIG. 15) from the central control station (base station TP4). If a resource adjustment result has been received (021, yes), the process proceeds to 022. If the resource adjustment result has not been received (021, none), the process proceeds to 024.
  • the DSP 32 determines whether the content (type) of the resource adjustment result is “reserved” or “reserved release”. If the type is “reserved”, the process proceeds to 023. If the type is “reservation cancellation”, the process proceeds to 027.
  • the DSP 32 makes a reservation for the RB for CoMP (CS) (RB4 in FIG. 15) with respect to the reservation application source (base station TP1). That is, the DSP 32 permits muting.
  • the DSP 32 cancels the reservation state of the CoMP (CS) RB being reserved in response to the reservation cancellation application.
  • the DSP 32 determines whether or not a non-transmission RB can be set for RBs other than the reserved RB. At this time, when the non-transmission RB cannot be set (024, No), the process proceeds to 026. On the other hand, when the non-transmission RB can be set (024, Yes), the DSP 32 sets the non-transmission RB (025). For example, when the traffic amount at the base station TP2 is small, the non-transmission RB can be set without affecting the system capacity. Alternatively, an RB reserved for the peripheral TP may be set as a non-transmission RB.
  • the DSP 32 notifies the RNTP information generation processing 41 of the RNTP update information. That is, the DSP 32 reflects only the setting state of the non-transmission RB in the RNTP update information. Upon notification, the DSP 32 performs an RNTP generation process 41 and performs an RNTP update process based on the RNTP update information.
  • FIG. 18 is a flowchart illustrating a processing example of the central control station (base station TP4). The process shown in FIG. 18 can be executed as a function of the DSP 32, for example.
  • the DSP 32 is an example of a “third control device”.
  • the DSP 32 receives the RNTP replacement instruction and the RNTP from the subordinate transmission stations (base stations TP2 and TP3).
  • the DSP 32 grasps RBs applicable to CoMP (CS) for the base station whose replacement instruction value is “1”. The grasping is performed by grasping the RB having a value of “0” in the RNTP received from the base station.
  • CS CoMP
  • the DSP 32 determines whether or not there is a reservation application (application information) for the RB for CoMP from the subordinate transmission station (base station TP1). At this time, if there is no application information, the process proceeds to 108. On the other hand, if there is application information, the process proceeds to 104.
  • the DSP 32 determines whether the type of the application information of the CoMP RB indicates “reservation” or “reservation release”. At this time, if the type is reservation cancellation, the process proceeds to 107. On the other hand, if the type is reservation, the process proceeds to 105.
  • the DSP 32 determines whether or not the CoMP RB can be reserved for the base station TP1. At this time, if the reservation is not possible (105, No), the process proceeds to 108. If a reservation is possible (105, Yes), the process proceeds to 106.
  • the DSP 32 reserves the RB for CoMP.
  • a part or all of the RB can be reserved as a CoMP RB.
  • a common RB for example, common non-shared TP
  • the base station TP4 can adjust the position of the non-transmission RB so that the transmission RB) is reserved.
  • the DSP 32 releases the reserved state of the CoMP RB related to the base station TP1.
  • the DSP 32 notifies (transmits) the resource adjustment result via the wired I / F 33.
  • the resource adjustment result includes reserved RB information for the reservation application source. Further, the resource adjustment result includes information on reserved RBs and information on non-transmission RBs (when adjustment is performed) for the cooperative TP. The content of the resource adjustment result may differ between the application source and the cooperative TP.
  • the base station TP1, the base station TP2, the base station TP3, and the base station TP4 are connected to each other via a wired I / F 33, and the exchange of information described above is performed via the wired I / F 33.
  • the central control station controls the implementation of CoMP (CS) between a plurality of cells.
  • CS CoMP
  • the interference with respect to UE1 can be suppressed because a neighboring cell performs muting by CS with respect to a certain base station (TP1).
  • TP1 base station
  • the processing load at each base station is reduced.
  • the base station TP2 or the base station TP3 may have a function as a central control station of the base station TP4. That is, a configuration in which the second base station includes a control station is applicable. In this case, the exchange of information between the second base station and the control station is performed using internal communication. Further, the base station TP4 may have a function as the base stations TP2 and TP3 (peripheral cells).
  • Embodiment 8 Next, Embodiment 8 will be described. Since the configuration of the eighth embodiment has common points with the configurations of the first and second embodiments, differences will be mainly described, and description of common points will be omitted. In the eighth embodiment, variations of interpretation of RNTP will be described.
  • the base station can interpret RNTP to have a meaning different from the original meaning of RNTP by referring to the RNTP replacement instruction “1”.
  • the required properties for interpretation to different meanings include: (1) Even if a conventional base station (eNB) interprets it as RNTP, there is no problem in the system. (2) Unique (cell-specific) information about the own cell that the own cell declares to other cells. (3) A narrow concept included in RNTP.
  • Scheduling frequency is useful information in the environment of Small Cell Enhancement (SCE: wireless network using small cells) where traffic load tends to be small.
  • SCE Small Cell Enhancement
  • an RB non-transmission RB
  • an RB low transmission frequency RB
  • scheme 2 information exchanged between cells is information regarding scheduling frequency. For this reason, the influence of delay is small.
  • scheduling itself is not coordinated, but coordination is performed for scheduling frequency management.
  • FIG. 19 is a sequence diagram showing a processing example (operation example) of intermittent CoMP CS based on the interpretation of method 2. The operation in FIG. 19 will be described in comparison with the fourth embodiment (CoMP CS) shown in FIG.
  • the base station TP2 which is a cooperative cell determines a low transmission frequency RB instead of a non-transmission RB, and updates RNTP (reflects the low transmission frequency RB) (FIG. 19).
  • RNTP reflects the low transmission frequency RB
  • 19 ⁇ 6> In the example of FIG. 19, RB4 and RB5 are selected as the low transmission frequency RB.
  • intermittent muting means that muting is intermittently performed on two or more subframes having a discrete positional relationship among a plurality of subframes forming the RB.
  • the base station TP2 reserves RB5 as an RB that performs intermittent muting in response to the reservation application of the base station TP1. That is, the application of intermittent muting in RB5 is permitted for UE1 under the control of base station TP1. Then, the base station TP2 notifies the reserved RB and the intermittent muting pattern to the base station TP1 ( ⁇ 12> in FIG. 19).
  • the base station TP1 is different from the fourth embodiment in that data (PDSCH) transmission using the RB5 to which the intermittent muting pattern is applied is performed.
  • the base station TP2 performs muting ( ⁇ 20> in FIG. 19).
  • the RNTP update process is not executed, and the RB reservation cancellation corresponding to the cancellation application is performed.
  • FIG. 20 is a flowchart illustrating processing of the base station TP1 in intermittent CoMP CS according to the eighth embodiment.
  • the process of FIG. 20 is executed by the DSP 32, for example.
  • the process shown in FIG. 20 is substantially the same as the process (FIG. 13) of the base station TP1 in the sixth embodiment. However, the following points are different.
  • the process of 08A is executed instead of 08 of FIG.
  • the muting pattern notified from the base station TP2 is notified to the scheduler 40 in addition to the reserved RB.
  • FIG. 21 is a flowchart showing processing of the base station TP2 in intermittent CoMP CS according to the eighth embodiment.
  • the process of FIG. 21 is executed by the DSP 32, for example.
  • the process shown in FIG. 21 is almost the same as the process (FIG. 14) of the base station TP2 in the sixth embodiment. However, the following points are different.
  • the DSP 32 makes a reservation for the CoMP (CS) RB, and notifies the reserved RB and the muting pattern.
  • the muting pattern is prepared (stored) in advance in, for example, a memory in the base station TP2.
  • the DSP 32 determines whether or not the low transmission frequency RB can be set for RBs other than the reserved RB. At this time, if the low transmission frequency RB cannot be set (005A, No), the process proceeds to 007. On the other hand, when the low transmission frequency RB can be set (005A, Yes), the process proceeds to 006, and the DSP 32 sets the low transmission frequency RB. For example, an RB whose scheduling frequency (transmission frequency) in a certain period is lower than a threshold prepared in advance can be determined as the low transmission frequency RB.
  • the base station TP1 can perform data transmission using the CS RB to which the intermittent muting pattern is applied.
  • TP1, TP2, TP3, TP4 Base station 1,10 ... UE 32 ... DSP

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Abstract

Dans cette invention, une station de base : reçoit, en provenance d'une station de base périphérique, des informations de ressources appartenant à une pluralité de ressources qui peuvent être attribuées à un terminal mobile, et des données interprétées correspondant auxdites informations de ressources ; informe la station de base périphérique de la ressource qui doit être utilisée dans la transmission multipoint coordonnée et qui a été sélectionnée sur la base des informations de ressources lorsque la valeur des données interprétées signifiait que les informations de ressources indiquaient une ressource pouvant être utilisée dans la transmission multipoint coordonnée ; et exécute un processus permettant de réaliser avec une station de base périphérique une transmission multipoint coordonnée à destination d'un terminal mobile au moyen de la ressource sélectionnée.
PCT/JP2013/072903 2012-08-27 2013-08-27 Système de communication sans fil et station de base WO2014034679A1 (fr)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2016084268A1 (fr) * 2014-11-28 2016-06-02 パナソニックＩｐマネジメント株式会社 Station de base et procédé de sélection de mode de transmission coordonnée
JPWO2016121251A1 (ja) * 2015-01-29 2017-11-09 ソニー株式会社 装置及び方法

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