WO2011043477A1 - 通信システム、無線基地局及び通信制御方法 - Google Patents
通信システム、無線基地局及び通信制御方法 Download PDFInfo
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- WO2011043477A1 WO2011043477A1 PCT/JP2010/067798 JP2010067798W WO2011043477A1 WO 2011043477 A1 WO2011043477 A1 WO 2011043477A1 JP 2010067798 W JP2010067798 W JP 2010067798W WO 2011043477 A1 WO2011043477 A1 WO 2011043477A1
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- base station
- radiation pattern
- resource block
- radio base
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- 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
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
Definitions
- the present invention is a communication system for allocating radio resources specified by at least a frequency used for communication between a radio base station and a radio terminal, and specified by at least a frequency used for communication between the radio terminals.
- the present invention relates to a radio base station that allocates radio resources and a communication control method in a communication system.
- a radio base station applies an individual MIMO (Multiple Input Multiple Output) method and transmission weight to a radio terminal. It is possible. Also, the radio base station can allocate a subframe, which is a radio resource, to a radio terminal based on a standard such as PF (Proportional Fair).
- PF Proportional Fair
- a radio terminal represents a radio wave environment at a certain time as SINR (Signal toInterference and Noise power Ratio), and feeds back a MIMO scheme assumed to have the best SINR and a transmission weight to the radio base station. .
- SINR Signal toInterference and Noise power Ratio
- the radio terminal performs feedback to the radio base station regarding the SINR when the MIMO scheme and the transmission weight that are the targets of feedback are reflected.
- the radio base station determines resource block allocation priority, modulation scheme, coding rate, and the like for the radio terminal based on the SINR.
- 3GPP TS 36.213 V8.7.0 “Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) (Physical layer Procedures (Release 8))
- 3GPP TS 36.211 V8.7.0 “Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) (Physical Channels and Modulation (Release 8))
- the radio base station assigns a resource block based on feedback information from the radio terminal to each radio terminal connected to the radio base station, the radio base station corresponds to the resource block.
- the MIMO scheme and the transmission weight depend on the communication status of the radio terminal to which the resource block is assigned, and are assumed to fluctuate frequently.
- the radiation pattern that is uniquely specified by the MIMO scheme and the transmission weight also changes frequently. Furthermore, when the radiation pattern greatly fluctuates, the interference received by other radio terminals connected to other radio base stations frequently fluctuates, and the radiation patterns in other radio base stations frequently fluctuate.
- an object of the present invention is to provide a communication system, a radio base station, and a communication control method that can appropriately perform radio resource allocation in which frequent fluctuations in interference are suppressed.
- the present invention has the following features.
- the first feature of the present invention is that radio resources used for communication between a radio base station (radio base station 1A) and radio terminals (radio terminals 2A and 2C) are uniquely specified by at least the frequency.
- a communication system wireless communication system 10 that performs allocation
- at least one of the wireless base station and the wireless terminal includes a plurality of antennas that can change a radiation pattern that is a radio signal reachable range
- the generation unit RB-MIMO information association unit 162 that generates an association between a radio resource and the radiation pattern
- the radio resource is transmitted to the radio terminal.
- an allocating unit allocating unit 166) for allocating the data.
- Such a communication system generates an association between a radio resource and a radiation pattern, and allocates a radio resource to a radio terminal based on the association. That is, the relationship between the radio resource specified by the frequency and the radiation pattern is fixed, in other words, the relationship between the frequency and the radiation pattern is fixed.
- the radiation pattern does not fluctuate frequently. Therefore, it is possible to suppress frequent fluctuation of interference received by other wireless terminals connected to other wireless base stations, and the other wireless terminals can continuously use the radio resources once allocated. It becomes possible.
- the gist of a second feature of the present invention is that the generation unit generates the association based on a communication status of the wireless terminal.
- a gist of a third feature of the present invention is that the generation unit generates the association based on a radio resource allocation status with respect to the radio terminal within a predetermined period in the past.
- the allocating unit is configured to transmit a radio wave associated with the other radiation pattern based on a degree of coincidence between the radiation pattern requested by the predetermined radio terminal and the other radiation pattern.
- the gist is to set resource allocation priority and allocate the radio resource to the predetermined radio terminal based on the allocation priority.
- a fifth feature of the present invention is a radio base station that is used for communication with a radio terminal and allocates radio resources that are uniquely specified by at least a frequency, the radio base station and the radio terminal At least one includes a plurality of antennas that can change a radiation pattern that is a radio signal reachable range, and generates a correspondence between the radio resource and the radiation pattern, and is generated by the generator
- the gist is provided with an allocating unit that allocates the radio resource to the radio terminal based on the association.
- a sixth feature of the present invention is a communication control method in a communication system for allocating a radio resource uniquely specified by at least a frequency, which is used for communication between a radio base station and a radio terminal.
- At least one of the base station and the wireless terminal includes a plurality of antennas capable of changing a radiation pattern that is a radio signal reachable range, and the communication system generates a correspondence between the radio resource and the radiation pattern And a step of allocating the radio resource to the radio terminal based on the generated association.
- a seventh feature of the present invention is a communication control method in a communication system for allocating a radio resource specified by at least a frequency used for communication between a radio base station and a radio terminal, wherein the radio base station And at least one of the wireless terminals includes a plurality of antennas capable of changing a radiation pattern that is a wireless signal reachable range, and transmitting information from the wireless terminal to the wireless base station; and Information necessary for the radio base station to select a MIMO scheme corresponding to the radio terminal and to form the radiation pattern corresponding to the MIMO scheme, the radio base station, the radio resource and the radio resource Generating a correspondence with the radiation pattern formed based on information, and the radio base station Zui it is summarized as further comprising a step of allocating the radio resource to the radio terminal.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
- FIG. 2 is a configuration diagram of a radio base station according to the embodiment of the present invention.
- FIG. 3 is a configuration diagram of the RB-MIMO information association unit according to the embodiment of the present invention.
- FIG. 4 is a diagram illustrating an example of a radiation beam in the radio base station according to the embodiment of the present invention.
- FIG. 5 is a diagram showing an example of association of RB-MIMO information according to the embodiment of the present invention.
- FIG. 6 is a flowchart showing a first operation of resource block allocation by the radio base station according to the embodiment of the present invention.
- FIG. 7 is a flowchart showing a first operation of generating a correspondence between resource blocks and MIMO information according to the embodiment of the present invention.
- FIG. 8 is a flowchart showing a second operation for generating a correspondence between resource blocks and MIMO information according to the embodiment of the present invention.
- FIG. 9 is a flowchart showing a second operation of resource block allocation by the radio base station according to the embodiment of the present invention.
- FIG. 10 is a diagram illustrating the SINR of the conventional and the present embodiment.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10 according to an embodiment of the present invention.
- the wireless communication system 10 shown in FIG. 1 has a configuration based on LTE (Long Term Evolution) which is a standard formulated by 3GPP.
- the radio communication system 10 includes radio base stations 1A and 1B having two antennas and radio terminals 2A, 2B and 2C having two antennas.
- the radio terminals 2A and 2C exist in a cell 3A formed by the radio base station 1A. Further, the wireless terminal 2B exists in a cell 3B formed by the wireless base station 1B.
- the radio base station 1A performs communication with the radio terminals 2A and 2C existing in the cell 3A. At this time, the radio base station 1A forms radiation patterns 4A and 4C, which are radio signal reachable ranges.
- the radio base station 1B performs communication with the radio terminal 2B existing in the cell 3B.
- FIG. 2 is a diagram showing the configuration of the radio base station 1A.
- a radio base station 1A illustrated in FIG. 2 includes a control unit 102, a storage unit 103, a wired communication unit 104, a radio communication unit 105, and antennas 107A and 107B.
- the radio base station 1B has a similar configuration.
- the control unit 102 is configured by a CPU, for example, and controls various functions provided in the radio base station 1A.
- the storage unit 103 is configured by a memory, for example, and stores various types of information used for control and the like in the radio base station 1.
- the wired communication unit 104 is connected to a backbone network (not shown) via a router (not shown).
- the radio communication unit 105 receives radio signals from the radio terminals 2A and 2C by the MIMO method via the antennas 107A and 107B, and transmits radio signals to the radio terminals 2A and 2C.
- control unit 102 allocates resource blocks (RB), which are radio resources, to the radio terminals 2A and 2C.
- RB resource blocks
- control section 102 includes scheduling scheme determining section 160, RB-MIMO information associating section 162, allocation candidate / MCS / MIMO scheme determining section 164, and allocation section 166.
- the radio base station 1A includes two transmission antennas 107A and 107B, and the radio terminals 2A and 2C include two reception antennas. In such a 2 ⁇ 2 configuration, the radio base station 1A determines the MIMO scheme for the radio terminals 2A and 2C.
- the control unit 102 in the radio base station 1A includes an Open Loop MIMO, in which only RI (Rank Indicator), which is spatially multiplexed information, is MIMO information fed back from the radio terminals 2A and 2C, RI, PMI (Precoding Matrix Indicator) which is transmission weight index information determines one of the MIMO methods of Closed Loop MIMO which becomes MIMO information fed back from the wireless terminals 2A and 2C.
- RI Rank Indicator
- PMI Precoding Matrix Indicator
- the antennas 107A and 107B in the radio base station 1A transmit signals based on a predetermined rule. Thereby, a corresponding radiation pattern is formed.
- the radiation pattern formed by the radio base station 1A is selected so that gain can be obtained in the radio terminals 2A and 2C in the cell 3A.
- the radiation pattern may increase the interference, or conversely, reduce the interference.
- the information fed back from the wireless terminals 2A and 2C includes information related to the communication status in the wireless terminals 2A and 2C in addition to the MIMO information described above.
- One of them is CQI (Channel Quality Indicator) in which SINR is replaced with bit information.
- This CQI corresponds to the fed back MIMO information, and is the CQI when the MIMO scheme and transmission weight desired by the radio terminals 2A and 2C included in the MIMO information are selected.
- the control unit 102 in the radio base station 1A Based on the MIMO information and CQI, the control unit 102 in the radio base station 1A performs scheduling such as resource block allocation and modulation scheme (MCS) determination for the radio terminal 2A so that the target error rate can be achieved.
- MCS resource block allocation and modulation scheme
- the interference received by the radio terminals 2A and 2C may also vary. Further, the interference received by the wireless terminal 2A varies for each subframe.
- the SINR corresponding to the CQI at the time of feedback and the time at which communication is actually performed are performed.
- the SINR greatly fluctuates, particularly when the SINR deteriorates at the time when communication is actually performed, the required SINR corresponding to the SINR set by scheduling cannot be satisfied, and communication becomes impossible.
- the RB-MIMO information association unit 162 in the control unit 102 in the radio base station 1A uniquely assigns a radiation pattern to each resource block prior to scheduling for the radio terminals 2A and 2C.
- MIMO information consisting of a MIMO scheme and transmission weights. This association information is stored in the storage unit 103.
- FIG. 3 is a configuration diagram of the RB-MIMO information association unit 162.
- the RB-MIMO information associating unit 162 shown in FIG. 3 includes a temporary allocation determining unit 169, a per-RB MIMO information counting unit 170, a counter reset signal generation determining unit 172, a per-RB maximum MIMO information determining / updating unit 174, and a per-RB MIMO.
- An information priority determination unit 176 is an information priority determination unit 176.
- the provisional allocation determination unit 169 is configured so that an allocation candidate RB / MCS / MIMO method determination unit 164 (to be described later) sets a MIMO method and a transmission weight for each of the wireless terminals 2A and 2C based on the MIMO information from the wireless terminals 2A and 2C.
- an allocation candidate RB / MCS / MIMO method determination unit 164 sets a MIMO method and a transmission weight for each of the wireless terminals 2A and 2C based on the MIMO information from the wireless terminals 2A and 2C.
- one or more resource blocks (allocation candidate resource blocks) and MCS that are allocation candidates are determined based on the CQI for each resource block from the radio terminals 2A and 2C.
- resource blocks are virtually allocated to the wireless terminals 2A and 2C based on the determination.
- temporary allocation determining section 169 outputs MIMO information corresponding to the virtually allocated resource block to per-RB MIMO information counting section 170.
- the per-RB MIMO information counting unit 170 inputs the MIMO information for each resource block (for each frequency) from each of the wireless terminals 2A and 2C in the cell 3A.
- the input MIMO information is the MIMO information corresponding to the radiation pattern required by the wireless terminals 2A and 2C at that time, or the MIMO corresponding to the radiation pattern in the resource block allocated to the wireless terminals 2A and 2C at that time. Information.
- the RB-specific MIMO information counting unit 170 inputs the MIMO information from the temporary allocation determining unit 169.
- the per-RB MIMO information counting section 170 counts the number of input MIMO information for each resource block and for each different MIMO information. Further, the RB-specific MIMO information counting unit 170 sets the combination of the count value, the corresponding resource block identification information (resource block ID), and the corresponding MIMO information identification information (MIMO information ID) to the maximum RB-specific MIMO. The information is output to the information determination / update unit 174.
- a signal (time period signal) is input to the counter reset signal generation determination unit 172 at a predetermined time period.
- the predetermined time period is a time period longer than the time corresponding to one subframe, which is the interference fluctuation period.
- the counter reset signal generation determination unit 172 outputs a reset signal to the per-RB MIMO information counting unit 170 when a time period signal is input.
- the RB-specific MIMO information count unit 170 determines the count value of the MIMO information when a reset signal is input. Furthermore, the per-RB MIMO information counting section 170 causes the storage section 103 to retain a set of the determined count value, the resource block ID of the corresponding resource block, and the MIMO information ID of the corresponding MIMO information. Thereafter, the per-RB MIMO information counting section 170 resets the count value.
- the RB maximum MIMO information determination / update unit 174 reads a set of the count value, the resource block ID, and the MIMO information ID from the storage unit 103. Further, a time period signal is input to the RB maximum MIMO information determination / update unit 174 at a predetermined time period. When the time period signal is input, the RB maximum-number MIMO information determination / update unit 174 specifies, for each resource block, a resource block ID and a MIMO information ID that have the largest corresponding count value.
- the RB maximum MIMO information determination / update unit 174 sets, for each resource block, a combination of the resource block ID and the MIMO information ID corresponding to the maximum count value, and the resource block ID and the MIMO information corresponding to the non-maximum corresponding count value.
- the ID set is output to the per-RB MIMO information priority determination unit 176.
- the RB-specific MIMO information priority determination unit 176 sets a combination of a resource block ID and a MIMO information ID corresponding to the largest count value and a combination of a resource block ID and a MIMO information ID corresponding to the smallest count value. Enter.
- the RB-specific MIMO information priority determination unit 176 has a radiation pattern (uniquely identified by the MIMO information corresponding to the MIMO information ID in the combination of the resource block ID and the MIMO information ID corresponding to the largest count value. A first radiation pattern), and a radiation pattern uniquely identified by the MIMO information corresponding to the MIMO information ID in the set of resource block ID and MIMO information ID corresponding to the least number of count values (second radiation pattern) Radiation pattern).
- the per-RB MIMO information priority determination unit 176 sets a weight for a set of resource block ID and MIMO information ID. Specifically, per-RB MIMO information priority determination section 176 sets a maximum weighting value for the combination of resource block ID and MIMO information ID corresponding to the first radiation pattern, and supports the second radiation pattern. For the set of resource block ID and MIMO information ID to be performed, the closer the shape and radiation direction of the corresponding second radiation pattern is to the shape and radiation direction of the first radiation pattern, the larger the value (however, it is smaller than the maximum value) The weighting value is set so that
- the first radiation pattern is 4A
- the second radiation patterns are 4B, 4C, and 4D.
- the shape and radiation direction of the second radiation pattern are larger in the order closer to the shape and radiation direction of the first radiation pattern 4A.
- a weighting value is set.
- the per-RB MIMO information priority determination unit 176 sets the highest count including the combination of the resource block ID and the MIMO information ID with the highest corresponding count value for each resource block, and the resource block with the lowest corresponding count value. For a set of ID and MIMO information ID, association of RB-MIMO information arranged in the second and subsequent order in the corresponding weighting value is generated. This association of RB-MIMO information is generated and updated at the input period of the time period signal.
- FIG. 5 is a diagram showing an example of association of RB-MIMO information.
- MIMO information IDs corresponding to resource block ID # 1 are arranged in the order of MIMO information IDs # 5, # 2, # 4, and # 7.
- MIMO information IDs corresponding to resource block ID # 2 are arranged in the order of MIMO information IDs # 2, # 1, # 6, and # 7.
- the per-RB MIMO information priority determination unit 176 may generate only the combination of the resource block ID and the MIMO information ID corresponding to the first radiation pattern as the association of the RB-MIMO information.
- the scheduling method determination unit 160 acquires information on interference that the wireless terminals 2A and 2C receive by communication between the other wireless base station 1B and the wireless terminal 2B in the cell 3B in the wireless base station 2B.
- the interference information may be the CQI when the radio terminals 2A and 2C measure the SINR, further generate the CQI corresponding to the SINR, and transmit it to the radio base station 1A.
- a combination of the distance to the wireless base station 1B and the transmission power of the wireless base station 1B may be used.
- the scheduling method determination unit 160 determines whether or not the interference is equal to or higher than a predetermined level. For example, when the interference information is CQI from the wireless terminals 2A and 2C, the scheduling method determining unit 160 determines that the interference is equal to or higher than a predetermined level when the CQI is equal to or lower than a predetermined value, If it exceeds, it is determined that the interference is below a predetermined level.
- the interference information is a combination of the distance from the radio base station 1A to the other radio base station 1B, the distance from the radio base station 1A to the other radio base station 1B, and the transmission power of the radio base station 1B.
- a predetermined condition for example, a condition indicating a correspondence relationship between the distance and the transmission power such that the transmission power is lower as the distance is shorter.
- the scheduling method determination unit 160 determines resource block allocation considering the association of RB-MIMO information.
- scheduling scheme determining section 160 determines normal resource block allocation that does not consider association of RB-MIMO information.
- the allocation candidate RB / MCS / MIMO scheme determining unit 164 determines the MIMO scheme and the transmission weight for each of the radio terminals 2A and 2C based on the MIMO information from the radio terminals 2A and 2C, and the radio terminals 2A and 2C. Each time, one or a plurality of allocation candidate resource blocks (allocation candidate resource blocks) and MCS are determined based on the CQI for each resource block from the radio terminals 2A and 2C.
- the allocation unit 166 allocates resource blocks for each of the wireless terminals 2A and 2C. Specifically, the allocation unit 166 sets the allocation priority for the determined allocation candidate resource block for each of the radio terminals 2A and 2C. Here, the allocation unit 166 sets the priority of the allocation so that the resource block with the corresponding CQI has a higher allocation priority.
- the allocation unit 166 reads the association of RB-MIMO information from the storage unit 103. . Furthermore, the allocation unit 166 changes the allocation priority for the allocation candidate resource block based on the association of the RB-MIMO information.
- allocating section 166 for the allocation candidate resource block, the MIMO information and the transmission weight corresponding to the RB-MIMO information including the resource block ID corresponding to the allocation candidate resource block.
- the allocation priority is set to the highest.
- the allocation unit 166 allocates an allocation candidate resource block that is unused and has the highest allocation priority among the allocation candidate resource blocks to the allocation target radio terminal. Note that, when there are a plurality of allocation candidate resource blocks that are unused and have the highest corresponding allocation priority, the allocation unit 166 allocates any allocation candidate resource block to the allocation target radio terminal.
- the allocation unit 166 determines that the allocation candidate resource blocks are unused and The corresponding resource block with the highest allocation priority is allocated to the allocation target radio terminal.
- FIG. 6 is a flowchart showing a first operation of resource block allocation by the radio base station 1A.
- step S101 the control unit 102 in the radio base station 1A obtains the CQI for each resource block from each radio terminal (the radio terminals 2A and 2C in FIG. 1) in its own cell (cell 3A in FIG. 1). To do.
- step S102 the control unit 102 acquires MIMO information for each resource block from each of the wireless terminals in the own cell.
- step S103 the control unit 102 associates the resource block with the MIMO information.
- FIG. 7 is a flowchart showing a first operation for generating a correspondence between resource blocks and MIMO information.
- step S151 the RB-MIMO information associating unit 162 in the control unit 102 determines whether it is the reset timing of the counter (RB-specific MIMO information counting unit 170), specifically, whether a time period signal is input. Determine whether or not.
- step S152 the RB-MIMO information association unit 162 counts the number of MIMO information (number of inputs) for each resource block and for each different MIMO information. After that, the RB-MIMO information associating unit 162 repeats the operation after the determination whether it is the counter reset timing (step S151).
- step S153 the RB-MIMO information association unit 162 determines the number of MIMO information for each resource block, and stores it in the storage unit 103. Furthermore, in step S154, the RB-MIMO information association unit 162 resets the count value of the counter.
- step S155 the RB-MIMO information associating unit 162 identifies a set of the resource block ID and the MIMO information ID with the maximum corresponding count value based on the count value immediately before the counter value is reset.
- step S156 the RB-MIMO information associating unit 162 sets the maximum weighting value for the combination of the resource block ID and the MIMO information ID corresponding to the largest count value based on the count value immediately before the counter value is reset.
- the weighting value is set so as to be a value (however, smaller than the maximum value).
- step S157 the RB-MIMO information association unit 162 generates, for each resource block, association of RB-MIMO information in which pairs of resource block IDs and MIMO information IDs are arranged in descending order of corresponding weight values. .
- FIG. 8 is a flowchart showing a second operation for generating a correspondence between resource blocks and MIMO information.
- step S160 the RB-MIMO information association unit 162 in the control unit 102 virtually allocates allocation candidate resource blocks to the allocation target radio terminal. Thereafter, operations similar to those in steps S151 to S157 in FIG. 7 are performed.
- step S104 the control unit 102 determines whether all resource blocks have been assigned, or whether there is no wireless terminal to which no resource block is assigned.
- step S105 the control unit 102 assigns an assignment to each unassigned wireless terminal. Sets the allocation priority of candidate resource blocks.
- step S106 the control unit 102 changes the allocation priority of the allocation candidate resource block for each unallocated radio terminal based on the association of the RB-MIMO information.
- step S107 the control unit 102 specifies a radio terminal to which a resource block is assigned from radio terminals to which no resource block is assigned, based on the PF norm. Furthermore, the control unit 102 allocates any of the allocation candidate resource blocks to the radio terminal to which the resource block is allocated based on the allocation priority of the allocation candidate resource block after the change.
- step S108 the control unit 102 excludes the wireless terminal to which the resource block is allocated in step S107 from the allocation target, and excludes the resource block allocated in step S107 from the allocation target.
- step S104 Thereafter, the operations after the determination in step S104 as to whether or not all resource blocks have been assigned or whether or not there is a wireless terminal to which no resource block has been assigned are repeated.
- FIG. 9 is a flowchart showing a second operation of resource block allocation by the radio base station 1A.
- step S201 and step S202 are the same as the operations in step S101 and step S102 in FIG.
- step S203 the control unit 102 determines that each wireless terminal (wireless terminals 2A and 2C in FIG. 1) in its own cell (cell 3A in FIG. 1) and another wireless base station (wireless base station 1B in FIG. 1) Information on interference received by communication with a wireless terminal (wireless terminal 2B in FIG. 1) in a cell (cell 3B in FIG. 1) in another wireless base station is acquired.
- step S204 the control unit 102 determines whether or not the interference corresponding to the acquired interference information is equal to or higher than a predetermined level.
- step S205 the control unit 102 determines whether all resource blocks have been assigned, or whether there is no wireless terminal to which no resource block is assigned.
- step S206 the control unit 102 assigns an assignment to each unassigned wireless terminal. Sets the allocation priority of candidate resource blocks.
- step S207 based on the PF norm, the control unit 102 identifies a wireless terminal to which a resource block is assigned from among wireless terminals to which no resource block is assigned. Further, the control unit 102 allocates any of the allocation candidate resource blocks to the radio terminal to which the resource block is allocated based on the allocation priority of the allocation candidate resource block.
- step S208 the control unit 102 excludes the wireless terminal to which the resource block is allocated in step S207 from the allocation target, and excludes the resource block allocated in step S207 from the allocation target.
- step S205 Thereafter, the operations after the determination in step S205 whether or not all resource blocks have been assigned or whether or not there is a wireless terminal to which no resource block is assigned are repeated.
- step S211 the control unit 102 associates the resource block with the MIMO information.
- the operation for generating a correspondence between a specific resource block and MIMO information is the same as the operation shown in FIG.
- step S212 the control unit 102 determines whether all resource blocks have been allocated, or whether there is no wireless terminal to which no resource block has been allocated.
- step S213 the control unit 102 assigns an assignment to each unassigned wireless terminal. Sets the allocation priority of candidate resource blocks.
- step S214 the control unit 102 changes the allocation priority of the allocation candidate resource block for each unallocated radio terminal based on the association of the RB-MIMO information.
- step S215 the control unit 102 specifies a wireless terminal to which a resource block is assigned from wireless terminals to which no resource block is assigned based on the PF norm. Furthermore, the control unit 102 allocates any of the allocation candidate resource blocks to the radio terminal to which the resource block is allocated based on the allocation priority of the allocation candidate resource block after the change.
- step S216 the control unit 102 excludes the wireless terminal to which the resource block is allocated in step S215 from the allocation target, and excludes the resource block allocated in step S215 from the allocation target.
- step S212 the operations after the determination in step S212 regarding whether or not all resource blocks have been allocated or whether or not there is a wireless terminal to which no resource block has been allocated are repeated.
- the radio base station 1A generates and holds a correspondence between resource blocks and MIMO information, and based on the correspondence, the radio terminals 2A and 2C in the cell 3A. Allocate resource blocks for.
- the radio base station 1A does not frequently change the radiation pattern for a predetermined frequency. For this reason, it is suppressed that the interference which the other radio
- FIG. 10 is a diagram showing variations in SINR between the conventional technique and the present embodiment. As shown in FIG. 10, in this embodiment, the fluctuation of SINR is reduced.
- the radio base station 1A changes the allocation priority for the allocation candidate resource block based on the association between the resource block and the MIMO information, and determines the allocation candidate allocation based on the allocation priority after the change. Any one of the resource blocks is allocated to the wireless terminals 2A and 2C.
- the radio base station 1A receives the radio terminals 2A and 2C in the cell 3A through communication between the other radio base station 1B and the radio terminal 2B in the cell 3B in the other radio base station 1B.
- the interference is equal to or higher than a predetermined level, one of the associations between the resource blocks and the MIMO information is selected, and the resource blocks are allocated to the radio terminals 2A and 2C in the cell 3A based on the association. .
- the association between the resource block and the MIMO information is selected, and based on the association, the resource block is allocated to the radio terminals 2A and 2C in the cell 3A. Resource block allocation based on association can be performed as necessary, and the processing load can be reduced.
- the radio base station 1A generates a correspondence between the resource block and the MIMO information based on the number of MIMO information for each resource block from each of the radio terminals 2A and 2C in the cell 3A. Yes.
- the radiation pattern corresponding to the MIMO information can be regarded as a radiation pattern having a better communication state for the wireless terminal that is the transmission source of the MIMO information. Therefore, by generating the association between the resource block and the MIMO information based on the number of MIMO information, it is possible to generate the association in consideration of the communication status in the radio terminals 2A and 2C.
- a downlink resource block is associated with a downlink resource block and MIMO information is generated and held, and further a downlink resource block is allocated based on the association.
- the present invention can be applied.
- the wireless communication system 10 having a configuration based on LTE has been described.
- the present invention can be similarly applied to a wireless communication system having a configuration based on another communication standard.
- the communication system, radio base station, and communication control method of the present invention can suppress frequent interference fluctuations and are useful as communication systems and the like.
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Abstract
Description
(1.1)無線通信システムの全体概略構成
図1は、本発明の実施形態に係る無線通信システム10の全体概略構成図である。
図2は、無線基地局1Aの構成を示す図である。図2に示す無線基地局1Aは、制御部102、記憶部103、有線通信部104、無線通信部105、アンテナ107A及び107Bを含む。なお、無線基地局1Bも同様の構成を有する。
図6は、無線基地局1Aによるリソースブロック割り当ての第1の動作を示すフローチャートである。
本実施形態では、無線基地局1Aは、リソースブロックとMIMO情報との対応付けを生成、保持しておき、当該対応付けに基づいて、セル3A内の無線端末2A及び2Cに対してリソースブロックを割り当てる。
本発明は実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。
Claims (7)
- 無線基地局と無線端末との間の通信に用いられる、少なくとも周波数によって一意に特定される無線リソースの割り当てを行う通信システムであって、
前記無線基地局及び前記無線端末の少なくとも一方は、無線信号の到達範囲である放射パターンを変更可能な複数のアンテナを備えており、
前記無線リソースと前記放射パターンとの対応付けを生成する生成部と、
前記生成部によって生成された前記対応付けに基づいて、前記無線端末に対して前記無線リソースを割り当てる割当部と
を備える通信システム。 - 前記生成部は、前記無線端末の通信状況に基づいて、前記対応付けを生成する請求項1に記載の通信システム。
- 前記生成部は、過去の所定期間内における、前記無線端末に対する無線リソースの割り当て状況に基づいて、前記対応付けを生成する請求項2に記載の通信システム。
- 前記割当部は、前記所定の無線端末によって要求される放射パターンと他の放射パターンとの一致の度合に基づいて、前記他の放射パターンに対応付けられた無線リソースの割り当ての優先度を設定し、前記割り当ての優先度に基づいて、前記所定の無線端末に対して、前記無線リソースを割り当てる請求項1乃至3の何れかに記載の通信システム。
- 無線端末との間の通信に用いられる、少なくとも周波数によって一意に特定される無線リソースの割り当てを行う無線基地局であって、
前記無線基地局及び前記無線端末の少なくとも一方は、無線信号の到達範囲である放射パターンを変更可能な複数のアンテナを備えており、
前記無線リソースと前記放射パターンとの対応付けを生成する生成部と、
前記生成部によって生成された前記対応付けに基づいて、前記無線端末に対して前記無線リソースを割り当てる割当部と
を備える無線基地局。 - 無線基地局と無線端末との間の通信に用いられる、少なくとも周波数によって一意に特定される無線リソースの割り当てを行う通信システムにおける通信制御方法であって、
前記無線基地局及び前記無線端末の少なくとも一方は、無線信号の到達範囲である放射パターンを変更可能な複数のアンテナを備えており、
前記通信システムが、前記無線リソースと前記放射パターンとの対応付けを生成するステップと、
前記通信システムが、生成された前記対応付けに基づいて、前記無線端末に対して前記無線リソースを割り当てるステップと
を備える通信制御方法。 - 無線基地局と無線端末との間の通信に用いられる、少なくとも周波数によって特定される無線リソースの割り当てを行う通信システムにおける通信制御方法であって、
前記無線基地局及び前記無線端末の少なくとも一方は、無線信号の到達範囲である放射パターンを変更可能な複数のアンテナを備えており、
前記無線端末から前記無線基地局へ情報を送信するステップと、
前記情報は、前記無線基地局が、前記無線端末に対応したMIMO方式を選択し、当該MIMO方式に対応した前記放射パターンを形成するために必要な情報であって、
前記無線基地局が、前記無線リソースと前記情報に基づいて形成される前記放射パターンとの対応付けを生成するステップと、
前記無線基地局が、生成された前記対応付けに基づいて、前記無線端末に対して前記無線リソースを割り当てるステップと
を備える通信制御方法。
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WO2007083699A1 (ja) * | 2006-01-19 | 2007-07-26 | Matsushita Electric Industrial Co., Ltd. | 無線送信装置及び無線送信方法 |
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