WO2013146320A1 - Procédé de réglage de bande passante de système, système de communication sans fil, station de base et programme - Google Patents

Procédé de réglage de bande passante de système, système de communication sans fil, station de base et programme Download PDF

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Publication number
WO2013146320A1
WO2013146320A1 PCT/JP2013/057288 JP2013057288W WO2013146320A1 WO 2013146320 A1 WO2013146320 A1 WO 2013146320A1 JP 2013057288 W JP2013057288 W JP 2013057288W WO 2013146320 A1 WO2013146320 A1 WO 2013146320A1
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WIPO (PCT)
Prior art keywords
system band
mobile station
base station
mobile stations
setting
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PCT/JP2013/057288
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English (en)
Japanese (ja)
Inventor
憲治 小柳
信清　貴宏
石井　直人
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日本電気株式会社
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Publication of WO2013146320A1 publication Critical patent/WO2013146320A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation

Definitions

  • the present invention relates to a system band setting method, a wireless communication system, a base station, and a program.
  • MIMO is a technology that increases the number of signals that can be transmitted using the same frequency at the same time by preparing a plurality of transmitting and receiving antennas, thereby increasing the frequency utilization efficiency.
  • SU-MIMO transmits different signals to a single mobile station, whereas MU-MIMIO can transmit different signals to a plurality of mobile stations.
  • CA Carrier Aggregation
  • CC LTE system band
  • the same CC is set as a band that can be transmitted to mobile stations with high orthogonality of transmission beams between mobile stations, the interference between the mobile stations is small. Can be realized. However, when the same CC is set in a mobile station with low orthogonality of transmission beams between mobile stations, a high transmission rate can be achieved even if transmission is performed using MU-MIMO because of the large interference between mobile stations. Can not.
  • the problem to be solved by the present invention is to provide a technique for solving the above-mentioned problems.
  • a system band setting technique for improving the system capacity of a base station or the throughput of a mobile station by applying MU-MIMO. Is to provide.
  • the present invention for solving the above problems is a method of setting a system band that can be used for a base station to perform radio communication with a plurality of mobile stations in a radio communication system that uses a plurality of system bands.
  • a setting step of setting a system band used for communication by each mobile station, an acquisition step of acquiring communication quality information of the set system band, and the acquired communication quality information And a resetting step for resetting a system band set for each mobile station so that interference between terminals is reduced.
  • the present invention for solving the above-mentioned problems is a wireless communication system in which a base station sets a system band that can be used for wireless communication with a plurality of mobile stations in a wireless communication system that uses a plurality of system bands, For mobile stations belonging to the same base station, setting means for setting a system band used for communication by each mobile station, acquisition means for acquiring communication quality information of the set system band, and the acquired communication And re-setting means for resetting the system band set for each mobile station based on the quality information so as to reduce interference between terminals.
  • the present invention for solving the above-mentioned problems is a base station that sets a system band that can be used for a base station to perform radio communication with a plurality of mobile stations in a radio communication system that uses a plurality of system bands.
  • Setting means for setting a system band used for communication by each mobile station for a mobile station belonging to a base station, an acquisition means for acquiring communication quality information of the set system band, and the acquired communication quality
  • a resetting means for resetting a system band set for each mobile station based on the information so as to reduce interference between terminals.
  • the present invention for solving the above problems is a base station program for setting a system band that can be used for a base station to perform radio communication with a plurality of mobile stations in a radio communication system that uses a plurality of system bands.
  • the program acquires setting means for setting a system band used by each mobile station for communication with respect to mobile stations belonging to the same base station, and communication quality information of the set system band.
  • an acquisition unit configured to function as a resetting unit configured to reset the system band set for each mobile station based on the acquired communication quality information so that interference between terminals is reduced.
  • the system capacity of the base station or the throughput of the mobile station can be improved.
  • the reason is that the system band is set so that mobile stations with high orthogonality of transmission beams can transmit using the same system band.
  • the present invention first belongs to the same base station when the base station sets a system band that can be used for wireless communication with a plurality of mobile stations.
  • a system band used for communication by each mobile station is set for the mobile station.
  • the communication control information of the set system band is acquired, and the system band set in each mobile station is reset based on the communication control information so that interference between terminals is reduced. To do.
  • Embodiment 1 of the present invention will be described in detail with reference to the drawings.
  • an example of an LTE Release 10 radio communication system will be described.
  • the present embodiment is not limited to the radio communication system, and may be implemented in another radio communication system.
  • the first embodiment is based on a system band in which frequency intervals between a plurality of CCs (LTE system bands) are close to each other and the PMI value does not change greatly between CCs.
  • FIG. 1 shows the configurations of a base station 10 and a mobile station 20 in Embodiment 1 of the present invention.
  • the base station 10 is connected to a network (not shown).
  • the base station 10 includes a receiving unit 11, a CSI information extracting unit 12, a CC setting unit 13, a buffering unit 14, a scheduling unit 15, and a transmitting unit 16.
  • the receiving unit 11 receives a signal from the mobile station, performs demodulation processing, and extracts an uplink control signal from the demodulated signal.
  • the CSI extraction unit 12 extracts CSI (Channel State Information) information transmitted from the mobile station from the uplink control signal, and holds PMI (Precoding Matrix Indicator) information included in the CSI.
  • the CSI is downlink channel quality information between the base station and the mobile station measured by the mobile station.
  • PMI is one of CSI and is a number of a precoding matrix in which a reception quality at a mobile station is high in a codebook composed of a plurality of precoding matrices specified in LTE.
  • the CC setting unit 13 reads the PMI held by the CSI information extraction unit 12, sets the CC in the mobile station, and notifies the scheduling unit of the CC number set in the mobile station as CC setting information.
  • the buffering unit 14 receives data to be transmitted from the network to the mobile station and holds it as downlink data.
  • the scheduling unit 15 performs resource allocation by performing scheduling based on the CSI information in the CC corresponding to the CC setting information for each mobile station.
  • the scheduling unit 15 reads mobile station data from the buffering 14, multiplexes downlink data according to the resource allocation result, generates a downlink data multiplex signal, and generates a downlink data multiplex signal and a downlink reference signal as baseband signals.
  • a resource refers to a PRB (Physical Resouce Block), which is a radio frequency allocation unit. PRB is a frequency band of 180 kHz in which 12 subcarriers having a bandwidth of 15 kHz are continuous.
  • the transmitter 16 modulates the baseband signal to the carrier frequency to generate a carrier frequency signal, and transmits the carrier frequency signal to the mobile station.
  • the mobile station 20 includes a receiving unit 21, a PMI measuring unit 22, and a transmitting unit 23.
  • the receiving unit 21 receives a signal transmitted from the base station, performs demodulation processing, and generates a demodulated signal.
  • the PMI measurement unit 22 extracts the reference signal from the demodulated signal, calculates the PMI that maximizes the reception quality from the reference signal, and holds the calculation result as a PMI measurement value.
  • the transmission unit 23 generates a PMI measurement value as an uplink control signal and transmits the uplink control signal to the base station.
  • FIGS. 2 and 3 are flowcharts showing the CC setting operation.
  • FIG. 2 is a flowchart for setting a CC for a newly connected mobile station.
  • FIG. 3 is a flowchart for resetting a CC in consideration of inter-user interference for a connected mobile station. The CC setting operation will be described with reference to FIGS.
  • the CC setting unit 13 selects the CC with the smallest load.
  • the load is the number of mobile stations for which CC settings are determined.
  • the CC setting unit 13 checks whether there are a plurality of CCs selected in process 1. If there are a plurality of CCs selected in process 1, the process proceeds to process 3. If there is one CC selected in process 1, the process proceeds to process 4.
  • the CC setting unit 13 sets the CC having the lowest frequency among the CCs selected in process 1 to the mobile station.
  • the CC setting unit 13 sets the CC selected in process 1 to the mobile station.
  • FIG. 3 a flowchart for setting mobile stations with low inter-user interference when MU-MIMO is applied to the same CC will be described.
  • the flowchart of FIG. 3 is performed at regular intervals.
  • the CC setting unit 13 groups precoding matrices that are orthogonal to each other to generate a matrix orthogonal group.
  • LTE in the case of four transmitting antennas, a total of 16 types of PMI are specified (Non-Patent Document 2), a PMI group of 0-3, a group of 4-7, a group of 8-11, and 12-15
  • the precoding matrices in the group are orthogonal to each other.
  • the following four matrix orthogonal groups are generated.
  • Matrix orthogonal group 1 PMI0, PMI1, PMI2, PMI3 Matrix orthogonal group 2: PMI4, PMI5, PMI6, PMI7 Matrix orthogonal group 3: PMI8, PMI9, PMI10, PMI11 Matrix orthogonal group 4: PMI12, PMI13, PMI14, PMI15
  • the CC setting unit 13 receives a signal from the mobile station, performs demodulation processing to extract an uplink control signal, and extracts CSI information from the uplink control signal.
  • the base station 10 acquires the PMI of the CC set in process 2 from the CSI information for each mobile station.
  • the CC setting unit 13 estimates a PMI other than the CC set in the mobile station in process 2 of FIG.
  • the PMI acquired in the process 2 is used as an estimated value.
  • the CC setting unit 13 measures the number of mobile stations belonging to each matrix orthogonal group for each CC, and selects the matrix orthogonal group having the largest number of mobile stations as a matrix orthogonal group representing the CC. To do.
  • the CC setting unit 13 resets the same CC as before in the mobile station that reported the PMI of the matrix orthogonal group selected in process 4.
  • the CC setting unit 13 checks whether CC setting of all mobile stations has been completed. If completed, the process proceeds to process 8, and if not completed, the young mobile station is selected. Then, the process proceeds to treatment 7.
  • the CC setting unit 13 is a mobile station for which CC reconfiguration has not been completed, and the mobile station that does not belong to the representative matrix orthogonal group represents its own PMI in another CC. It is searched whether it belongs to the matrix orthogonal group. If there is a CC belonging to the matrix orthogonal group whose PMI is a representative, the CC is reset, and if it does not exist, the current assigned CC is reset. Next, it returns to the process 6 and repeats said process.
  • the CC setting unit 13 performs handover between CCs for the mobile station whose CC is changed in the above process 7, and sets the state in which data can be transmitted in the changed CC.
  • CC is set in the mobile station based on the flowchart of FIG. 2, and CC is set in the mobile station as shown in FIG.
  • the CC is reset in the mobile station.
  • process 2 it is assumed that the PMI for each mobile station as shown in FIG. 5 is acquired.
  • the matrix orthogonal group 1 is selected as the matrix orthogonal group representing CC in CC1 and the matrix orthogonal group 3 is selected in CC2.
  • process 5 CC1 is reset for mobile station 2 and mobile station 4, and CC2 is reset for mobile station 1, mobile station 3, and mobile station 5.
  • process 6 it is confirmed whether CC reconfiguration of all mobile stations has been completed.
  • the base station 10 assigns CC2 to the mobile station 0. To reset.
  • the base station 10 proceeds to action 8 because CC reconfiguration of all mobile stations has been completed.
  • the first embodiment since the number of mobile stations with low inter-user interference in the same CC increases, transmission opportunities in MU-MIMO increase, and base station capacity and mobile station throughput are improved.
  • the CC of the mobile station is reset in the process 5, but the present invention is not limited to this, and in the case of the same CC as before, it is not reset and the CC setting is continued. May be. Thereby, the signaling process between a base station and a mobile station can be reduced.
  • Embodiment 2 of the present invention will be described in detail with reference to the drawings.
  • CC setting is performed for each grouped mobile station so that the load between CCs is uniform.
  • the configurations of the base station and the mobile station in the second embodiment are the same as those of the base station and the mobile station in the first embodiment, description thereof is omitted.
  • the second embodiment will be described below using an example in which the number of CCs in the radio communication system band is 3, and the number of mobile stations in communication with the base station is 90. Further, as in the first embodiment, it is assumed that the frequency band between a plurality of CCs is close and a system band in which the value of PMI does not change greatly between CCs is assumed.
  • CC setting is performed for a newly connected mobile station by the method described in FIG. 2 of the first embodiment.
  • the same CC is reset in a mobile station with low inter-user interference when MU-MIMO is applied.
  • Processes 1 to 3 in FIG. 7 are the same as those in the first embodiment, and processes subsequent to process 4 are different from those in the first embodiment. With reference to FIG. 7, only the process 4 and subsequent steps different from the first embodiment will be described with respect to the CC resetting operation.
  • the CC setting unit 13 assigns the mobile stations to matrix orthogonal groups based on the PMI reported from the mobile stations.
  • the CC setting unit 13 selects a matrix orthogonal group having the maximum number of mobile stations from among the matrix orthogonal groups for which CC has not been reset.
  • the CC setting unit 13 resets the CC with the smallest load to the matrix orthogonal group set in process 5. If there are multiple CCs with the minimum load, select the CC number that is young. In the present embodiment, the load is the number of mobile stations for which CC reconfiguration has been determined.
  • the CC setting unit 13 confirms the completion of CC resetting for all matrix orthogonal groups, and if not completed, returns to process 5, and if completed, proceeds to process 8.
  • FIG. 8 shows an example in which the numbers of mobile stations reporting PMIs corresponding to the matrix orthogonal groups 1, 2, 3, and 4 are 40, 25, 20, and 5, respectively.
  • the matrix orthogonal group 1 having the largest number of mobile stations of 40 is selected.
  • the CC1 with the smallest number of mobile stations, 0 and the youngest is selected, and the selected CC1 is reset to the CC of the matrix orthogonal group 1.
  • process 7 it is confirmed whether CC setting of all matrix orthogonal groups has been completed. Since matrix orthogonal groups 2 to 4 remain, the process returns to process 5.
  • process 5 the matrix orthogonal group 2 with the second largest number of mobile stations is selected.
  • process 6 the CC2 having the smallest number of mobile stations and the smallest number is selected, and the selected CC2 is reset to the CC of the matrix orthogonal group 2.
  • process 7 it is confirmed whether CC resetting of all matrix orthogonal groups has been completed. Since matrix orthogonal groups 3 to 4 remain, the process returns to process 5.
  • process 5 for the third time, the matrix orthogonal group 3 having the third largest number of mobile stations is selected.
  • process 6 CC3 having the minimum number of mobile stations of 0 is selected, and the selected CC3 is reset to CC of matrix orthogonal group 3.
  • process 7 it is confirmed whether CC resetting of all matrix orthogonal groups has been completed. Since matrix orthogonal group 4 remains, the process returns to process 5.
  • the matrix orthogonal group 4 having the smallest number of mobile stations is selected.
  • the CC3 having the minimum number of mobile stations of 20 is selected, and the selected CC3 is reset to the CC of the matrix orthogonal group 4.
  • process 7 it is confirmed whether CC resetting of all matrix orthogonal groups is completed. Since CC resetting is completed, the process proceeds to process 8.
  • CC1 is assigned 40 mobile stations
  • CC2 is assigned 25 mobile stations
  • the CC setting unit 13 performs a handover between CCs in order to change the CCs of the mobile stations (five units) whose CCs are changed in the above process 6.
  • an independent matrix orthogonal group can be set for each CC and the CC can be reset for each matrix orthogonal group, so that the CC can be reset with a small number of processes.
  • the allowable number of mobile stations per matrix orthogonal group is determined as the load tolerance, and the matrix orthogonal group is determined so that the number of mobile stations corresponding to the matrix orthogonal group is equal to or less than the allowable number. .
  • the configurations of the base station and mobile station in the third embodiment are the same as those of the base station and mobile station in the second embodiment, description thereof will be omitted.
  • the third embodiment will be described below using an example in which the CC in the system band is 3 and the number of mobile stations currently connected to the base station is 90 as in the second embodiment. Further, in the third embodiment, as in the first embodiment, it is assumed that the frequency band between a plurality of CCs is close and the system band in which the PMI value does not change greatly between the CCs is assumed.
  • a CC is set for a newly connected mobile station by the method described in FIG. 2 of the first embodiment.
  • the same CC is reset to a mobile station with low inter-user interference when MU-MIMO is applied.
  • the CC setting operation will be described with reference to FIG.
  • a process 4A is added after the process 4 in the second embodiment. In the third embodiment, only the process 4A is different from the second embodiment, and therefore only the process 4A will be described.
  • grouping is performed so that the number of mobile stations in the matrix orthogonal group does not exceed the allowable number.
  • the allowable number is a value obtained by dividing the number of mobile stations accommodated in the base station by the number of CCs and rounding up the remainder. In the third embodiment, the description will be given below assuming that the allowable number is 30.
  • the allowable number is determined by the following formula. The allowable number is set so that the variation in the number of mobile stations between CCs falls within a predetermined range. Other than the determination method of the present embodiment, it may be set from (total number of mobile stations connected to base station / number of CCs + margin).
  • the base station 10 selects a group in which the number of mobile stations in the matrix orthogonal group exceeds the allowable number (30) in FIG. 8 used in the second embodiment, and divides the group. Since the number of mobile stations in the matrix orthogonal group 1 exceeds the allowable number (30), the matrix orthogonal group 1 is set to PMI0 so that the number of mobile stations in one matrix orthogonal group is equal to or less than the allowable number (30). And PMI1 are divided into two matrix orthogonal groups 1A and PMI2 and PMI3.
  • FIG. 11 shows the relationship of the number of mobile stations selected in the matrix orthogonal group obtained in the process 4A.
  • the permissible number per matrix orthogonal group since the permissible number per matrix orthogonal group is set, the number of mobile stations between CCs can be made uniform, that is, the load between system bands can be made uniform. Improve.
  • the matrix orthogonal group 1 is divided into a matrix orthogonal group of PMI0 and PMI1 and a matrix orthogonal group of PMI2 and PMI3.
  • the present invention is not limited to this.
  • the group may be divided so that the number of mobile stations is as balanced as possible.
  • the CC is set in the mobile station in the system band in which the frequency interval between a plurality of CCs is separated and the PMI value changes between CCs. Since the configurations of the base station and mobile station of the fourth embodiment are the same as those of the first embodiment, the description thereof is omitted. Further, in the fourth embodiment, as in the second embodiment, an example is used in which the CC in the system band is 3, two CCs are in the 2 GHz band, and one CC is in the 3 GHz band. Further, the following description will be made using an example in which the number of mobile stations connected to the base station is 30.
  • CC setting is performed for a newly connected mobile station by the method described in FIG. 2 of the first embodiment.
  • the same CC is set for a mobile station with low inter-user interference when MU-MIMO is applied.
  • the CC setting unit 13 creates a list of mobile station numbers connected to the base station 10 as a mobile station list.
  • the CC setting unit 13 receives a signal from the mobile station, performs demodulation processing, extracts an uplink control signal, and extracts CSI information from the uplink control signal.
  • the base station 10 acquires PMI from the CSI information.
  • the CC setting unit 13 estimates the PMI in another CC using the PMI reported by the mobile station in the CC set in the mobile station.
  • the base station maintains the PMI relationship as shown in FIG. 14 predicted in other frequency bands from the measured PMI values in a specific system band (frequency band) in advance, and in the 3 GHz band corresponding to the PMI measured in the 2 GHz band. Create PMI prediction values as a database.
  • a database acquisition method in FIG. 14 will be described. First, the direction that maximizes the transmission gain is calculated for each PMI in the 2 GHz band. Next, the PMI that maximizes the gain of the 3 GHz transmission beam in each calculated direction is calculated, and the 3 GHz band PMI corresponding to the 2 GHz band PMI is obtained.
  • the transmission gain can be calculated by the transmission antenna interval and the precoding matrix used.
  • the CC setting unit 13 refers to the matrix orthogonal group shown in FIG. 15 and calculates the number of mobile stations corresponding to the matrix orthogonal group to which the PMI of the mobile station belongs for each CC, as shown in FIG. To obtain a correspondence table of the number of mobile stations for a matrix orthogonal group and CC.
  • the CC setting unit 13 repeats processing 5, processing 6, processing 7, and processing 8 until CC reconfiguration of all mobile stations is completed.
  • the CC setting unit 13 selects the combination of the matrix orthogonal group and CC having the maximum number of mobile stations that is equal to or less than the allowable number.
  • the method for determining the allowable number is the same as in the third embodiment.
  • the CC setting unit 13 resets the CC selected in process 5 to the mobile station that has become the matrix orthogonal group selected in process 5, and updates the allowable number of CCs.
  • the CC setting unit 13 deletes the mobile station for which CC reconfiguration has been completed in process 6 and the CC whose allowable number has become 0 from the correspondence table of the number of mobile stations for the matrix orthogonal group and CC, and performs CC reconfiguration. Delete the number of the mobile station for which is completed from the mobile station list.
  • the CC setting unit 13 confirms the mobile station in the mobile station list, and returns to the process 5 if the mobile station remains in the mobile station list, and ends the process if the mobile station does not remain.
  • the CC setting unit 13 selects the maximum matrix orthogonal group and CC combination (CC1, matrix orthogonal group 4) with the number of mobile stations equal to or less than the allowable number in the table of FIG.
  • the CC setting unit 13 deletes the mobile station for which CC reconfiguration has been completed in the process 6 and CC1 whose allowable number is 0 from the table in FIG. 17, and obtains the table in FIG.
  • the CC setting unit 13 deletes the 10 mobile stations for which CC reconfiguration has been completed from the mobile station list. As a result, the number of mobile stations in the mobile station list is 20. In process 8, the CC setting unit 13 confirms the mobile stations in the mobile station list, and returns to process 5 because there are remaining mobile stations.
  • the CC setting unit 13 selects the largest matrix orthogonal group and CC combination (CC2, matrix orthogonal group 2) with the number of mobile stations equal to or less than the allowable number in the table of FIG. .
  • the CC setting unit 13 deletes the mobile station for which CC reconfiguration has been completed in process 6 and CC2 whose allowable number is 0 from the table in FIG. 18, and obtains the table in FIG.
  • the CC setting unit 13 deletes the 10 mobile stations for which CC reconfiguration has been completed from the mobile station list. As a result, the number of mobile stations in the mobile station list is 10. In process 8, the CC setting unit 13 confirms the mobile stations in the mobile station list, and returns to process 5 because there are remaining mobile stations.
  • the CC setting unit 13 selects the combination of the matrix orthogonal group and CC (CC3, matrix orthogonal group 3) having the maximum number of mobile stations equal to or less than the allowable number in the table of FIG. .
  • the CC setting unit 13 deletes the mobile station for which CC reconfiguration has been completed in process 6 from the table of FIG. 19, and acquires the table of FIG.
  • the CC setting unit 13 deletes the six mobile stations for which CC reconfiguration has been completed from the mobile station list. As a result, the number of mobile stations in the mobile station list is four.
  • the CC setting unit 13 confirms the mobile stations in the mobile station list, and returns to process 5 because there are remaining mobile stations.
  • the CC setting unit 13 selects the largest matrix orthogonal group and CC combination (CC3, matrix orthogonal group 1) with the number of mobile stations equal to or less than the allowable number in the table of FIG. .
  • the CC setting unit 13 deletes the mobile station for which CC reconfiguration has been completed in process 6 and CC3 whose allowable number is 0 from the table of FIG.
  • the base station 10 deletes the four mobile stations for which CC reconfiguration has been completed from the mobile station list. As a result, the number of mobile stations in the mobile station list becomes zero.
  • the CC setting unit 13 confirms the mobile stations in the mobile station list, and proceeds to process 9 because no mobile stations remain.
  • the CC setting unit 13 performs handover between CCs in order to change the CC of the mobile station whose CC is changed in process 6 above.
  • the PMI of another CC is estimated using the PMI in a single CC.
  • the proposed technique can also be implemented in a system in which the frequency band between them is far.
  • the CC setting unit 13 selects the matrix orthogonal group having the maximum number of mobile stations that is equal to or less than the allowable number. However, if there is a matrix orthogonal group in which the number of mobile stations exceeds the allowable number, Similarly to the second embodiment, after dividing so that the number of mobile stations in the matrix orthogonal group is equal to or less than the allowable number, it is necessary to select the matrix orthogonal group having the maximum number of mobile stations equal to or less than the allowable number.
  • the matrix orthogonal group is determined using PMI.
  • the present invention is not limited to this, and the matrix is determined using an uplink channel correlation value or a downlink channel correlation value.
  • An orthogonal group may be determined.
  • the PMI in the other CC is estimated from the PMI in the specific CC in the process 4, but the CC set in the mobile station is periodically changed to perform handover between the CCs and move You may make a station actually measure PMI in all CCs.
  • the number of mobile stations is used as a load.
  • the present invention is not limited to this, and the total value of the transmission buffer sizes of mobile stations in each CC may be used.
  • a base band is a method for setting a system band that can be used for radio communication with a plurality of mobile stations, For mobile stations belonging to the same base station, a setting step for setting a system band used by each mobile station for communication; An acquisition step of acquiring communication quality information of the set system band; A setting method comprising: a resetting step of resetting a system band set for each mobile station based on the acquired communication quality information so as to reduce interference between terminals.
  • the re-setting step includes re-setting so that mobile stations having orthogonality of transmission beams generated based on the acquired communication quality information are in the same system band. Setting method.
  • Appendix 7 The setting method according to appendix 4 or appendix 5, wherein the load is a buffer size.
  • the PMI of the system band other than the first system band, the spatial correlation value of the downlink channel estimation value, or the spatial correlation value of the uplink channel estimation value is represented by the PMI in the first system band and the spatial correlation of the downlink channel estimation value.
  • the setting method according to supplementary note 3, wherein a value or a spatial correlation value of an uplink channel estimation value is used.
  • the PMI of the system band other than the first system band, the spatial correlation value of the downlink channel estimation value, or the spatial correlation value of the uplink channel estimation value, and the PMI and downlink channel estimation value space in the first system band The setting method according to supplementary note 3, which is obtained using a correlation value or a spatial correlation value of an uplink channel estimation value, a transmission antenna interval, and a precoding matrix.
  • Each system band other than the first system band set in the mobile station is set as a usable system band, and the PMI of each system band, the spatial correlation value of the downlink channel estimation value, or the uplink channel estimation value Obtaining a spatial correlation value of The setting method according to supplementary note 3, wherein a PMI of each system band, a spatial correlation value of a downlink channel estimation value, or a spatial correlation value of an uplink channel estimation value is acquired.
  • a wireless communication system that uses a plurality of system bands, a wireless communication system that sets a system band that can be used by a base station for wireless communication with a plurality of mobile stations, For mobile stations belonging to the same base station, setting means for setting a system band used for communication by each mobile station; Obtaining means for obtaining communication quality information of the set system band;
  • a wireless communication system comprising: resetting means for resetting a system band set for each mobile station based on the acquired communication quality information so that interference between terminals is reduced.
  • the re-setting means performs re-setting so that mobile stations having high orthogonality of transmission beams generated based on the acquired communication quality information are in the same system band.
  • Wireless communication system
  • the resetting means calculates PMI (Precoding Matrix Indicator), a downlink channel estimation value spatial correlation value, or an uplink channel estimation value spatial correlation value so that orthogonality of transmission beams generated by the mobile station is high.
  • PMI Precoding Matrix Indicator
  • the mobile stations are grouped and grouped according to the PMI reported by the mobile station, the spatial correlation value of the downlink channel estimation value, or the spatial correlation value of the uplink channel estimation value.
  • the wireless communication system according to appendix 13, wherein the same system band is reset.
  • appendix 15 15. The wireless communication system according to appendix 14, further comprising means for estimating a load of each system band that can be used by the base station and limiting a system band that can be set in the mobile station based on the load.
  • Appendix 16 15. The wireless communication system according to appendix 14, wherein the resetting means resets a system band in the mobile station so that a load on each group after the grouping is uniform.
  • Appendix 18 The wireless communication system according to appendix 15 or appendix 16, wherein the load is a buffer size.
  • (Appendix 19) Means for obtaining a PMI in a first system band set in the mobile station, a spatial correlation value of a downlink channel estimation value, or a spatial correlation value of an uplink channel estimation value;
  • the PMI of the system band other than the first system band, the spatial correlation value of the downlink channel estimation value, or the spatial correlation value of the uplink channel estimation value is the spatial correlation of the PMI of the first system band and the downlink channel estimation value.
  • the wireless communication system according to supplementary note 14, wherein the wireless communication system is a value or a spatial correlation value of an uplink channel estimation value.
  • (Appendix 20) Means for obtaining a PMI in a first system band set in the mobile station, a spatial correlation value of a downlink channel estimation value, or a spatial correlation value of an uplink channel estimation value;
  • Each system band other than the first system band set in the mobile station is set as a usable system band, and the PMI of each system band, the spatial correlation value of the downlink channel estimation value, or the uplink channel estimation value Means for obtaining a spatial correlation value of 15.
  • Appendix 22 The wireless communication system according to any one of appendix 14 to appendix 21, wherein the system bandwidth is set as an available system bandwidth in order from the system bandwidth with the lowest load.
  • a base station sets a system band that can be used for wireless communication with a plurality of mobile stations, For mobile stations belonging to the same base station, setting means for setting a system band used for communication by each mobile station; Obtaining means for obtaining communication quality information of the set system band; A base station, comprising: resetting means for resetting a system band set for each mobile station based on the acquired communication quality information so that interference between terminals is reduced.
  • (Appendix 24) 24 The supplementary note 23, wherein the resetting means resets mobile stations having high orthogonality of transmission beams generated based on the acquired communication quality information so that they have the same system band. base station.
  • the resetting means calculates PMI (Precoding Matrix Indicator), a downlink channel estimation value spatial correlation value, or an uplink channel estimation value spatial correlation value so that orthogonality of transmission beams generated by the mobile station is high.
  • PMI Precoding Matrix Indicator
  • the mobile stations are grouped and grouped according to the PMI reported by the mobile station, the spatial correlation value of the downlink channel estimation value, or the spatial correlation value of the uplink channel estimation value.
  • 25 The base station according to appendix 24, wherein the same system band is reset.
  • appendix 26 The base station according to appendix 25, further comprising means for estimating a load of each system band that can be used by the base station and limiting a system band that can be set in the mobile station based on the load.
  • (Appendix 30) Means for obtaining a PMI in a first system band set in the mobile station, a spatial correlation value of a downlink channel estimation value, or a spatial correlation value of an uplink channel estimation value;
  • the PMI of the system band other than the first system band, the spatial correlation value of the downlink channel estimation value, or the spatial correlation value of the uplink channel estimation value is the spatial correlation of the PMI of the first system band and the downlink channel estimation value.
  • the base station according to supplementary note 25, wherein the base station is a value or a spatial correlation value of an uplink channel estimation value.
  • (Appendix 31) Means for obtaining a PMI in a first system band set in the mobile station, a spatial correlation value of a downlink channel estimation value, or a spatial correlation value of an uplink channel estimation value;
  • Each system band other than the first system band set in the mobile station is set as a usable system band, and the PMI of each system band, the spatial correlation value of the downlink channel estimation value, or the uplink channel estimation value Means for obtaining a spatial correlation value of 26.
  • (Appendix 33) 33 The base station according to any one of appendix 25 to appendix 32, wherein the base station is set as a usable system band in order from the system band with the lowest load.
  • a base station program that sets a system band that can be used for a base station to perform radio communication with a plurality of mobile stations, the program includes the base station, For mobile stations belonging to the same base station, setting means for setting a system band used for communication by each mobile station; Obtaining means for obtaining communication quality information of the set system band; A program that functions as resetting means for resetting a system band set for each mobile station based on the acquired communication quality information so that interference between terminals is reduced.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne la fourniture d'une technique destinée à régler une bande passante de système, qui améliore la capacité système d'une station de base ou le débit d'une station mobile par le biais de l'application de MU-MIMO. L'invention concerne le réglage de la bande passante de système, qui peut être utilisé par une station de base afin de réaliser une communication sans fil avec une pluralité de stations mobiles, dans un système de communication sans fil qui utilise une pluralité de bandes passantes de système. L'invention est caractérisée en ce que, par rapport aux stations mobiles appartenant à la même station de base, la bande passante de système utilisée pour la communication par chaque station de base est réglée, les informations de qualité de communication pour la bande passante de système sont obtenues et, sur la base des informations de qualité de communication obtenues, la bande passante de système qui a été réglée pour chaque station mobile est réglée de nouveau afin de réduire les interférences entre les terminaux.
PCT/JP2013/057288 2012-03-29 2013-03-14 Procédé de réglage de bande passante de système, système de communication sans fil, station de base et programme WO2013146320A1 (fr)

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Cited By (1)

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JP2010045442A (ja) * 2008-08-08 2010-02-25 Sharp Corp 無線通信システム、スケジューリング方法、通信装置およびプログラム
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JP7287779B2 (ja) 2016-03-24 2023-06-06 株式会社Ｎｔｔドコモ 無線基地局、張出装置及び通信制御方法

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