WO2011099622A1 - 無線基地局及び通信制御方法 - Google Patents
無線基地局及び通信制御方法 Download PDFInfo
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- WO2011099622A1 WO2011099622A1 PCT/JP2011/053145 JP2011053145W WO2011099622A1 WO 2011099622 A1 WO2011099622 A1 WO 2011099622A1 JP 2011053145 W JP2011053145 W JP 2011053145W WO 2011099622 A1 WO2011099622 A1 WO 2011099622A1
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- interference information
- base station
- interference
- radio base
- transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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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
- H04W72/27—Control channels or signalling for resource management between access points
Definitions
- the present invention relates to a radio base station that performs processing for causing another radio base station to control interference received from a radio terminal connected to another radio base station, and a communication control method in the radio base station.
- LTE Long Term Evolution
- OI Overload Indicator
- one radio base station measures the interference power in the uplink direction from neighboring cells in units of radio resources called resource blocks (RBs), and determines that “the interference is small” according to the interference power. ”,“ Interference is large ”, and“ Interference is very large ”are transmitted to the neighboring radio base stations.
- the neighboring radio base stations that have received the ternary information can control the transmission power (uplink transmission power) in the connected radio terminal using the ternary information. For example, if the neighboring radio base station receives information that the interference power is “very high”, the radio base station controls the radio terminal so as to reduce the transmission power in the uplink direction. Reduce interference power in the upstream direction.
- an object of the present invention is to provide a radio base station and a communication control method capable of preventing a reduction in communication capacity of the entire radio communication system.
- a first feature of the present invention is that a radio base station performs processing for causing the other radio base station to control interference received from a radio terminal connected to another radio base station (second radio base station 1B).
- Station (first radio base station 1A), based on the load of radio communication in the own radio base station, interference information, which is information related to interference power received from the radio terminal, to the other radio base station
- the gist is to include an interference information transmission control unit (transmission control unit 156) that controls transmission.
- Such a radio base station controls transmission of interference information, which is information related to the power of interference received from the radio terminal, based on the load of radio communication in the own radio base station.
- interference information which is information related to the power of interference received from the radio terminal
- whether or not the radio base station transmits interference information reflects the communication load in the radio base station, and other radio base stations in the radio base station that is the source of the interference information
- the interference information transmission control unit performs control to transmit the interference information when the value indicating the load of the wireless communication is equal to or greater than a threshold, and indicates the load of the wireless communication.
- the gist is to perform control to stop transmission of the interference information when the value is less than the threshold.
- the third feature of the present invention further includes an interference information generation unit (interference information generation unit 154) that generates the interference information, and the interference information generation unit transmits the interference information by the interference information transmission control unit.
- the gist is to stop the generation of the interference information when the interference information is generated when the control is performed and the control for stopping the transmission of the interference information is performed by the interference information transmission control unit.
- the fourth feature of the present invention further includes an interference power measurement unit (interference power measurement unit 150) that measures the interference power, and the interference power measurement unit transmits the interference information by the interference information transmission control unit.
- the gist is to stop the measurement of the interference power when the interference power is measured when the control is performed, and when the interference information transmission control unit performs the control to stop the transmission of the interference information.
- a fifth feature of the present invention is that the interference information transmission control unit has a value indicating a load of the wireless communication equal to or greater than a threshold value, and the interference information includes a corresponding interference power equal to or greater than a predetermined value.
- the first index value indicates the control for transmitting the interference information
- the value indicating the load of the wireless communication is less than the threshold
- the interference information corresponds to the interference power
- the gist is to perform control to stop transmission of the interference information when it is at least one of the second index values indicating that it is less than the predetermined value.
- the sixth feature of the present invention is that the interference information generation unit generates first interference information and second interference information, and the interference information transmission control unit corresponds to the first interference information corresponding to the first interference information.
- the interference power is a first index value indicating that the interference power is greater than or equal to a predetermined value
- the second interference information is a second index value indicating that the corresponding interference power is less than the predetermined value
- the second interference information is transmitted, the first interference information is the first index value, the second interference information is the first index value, and the radio
- control is performed to transmit the second index value as the second interference information, and the first interference information is the first index value.
- the second interference information is the first index value, which indicates a load of the wireless communication
- control is performed to stop transmission of the second interference information
- the first interference information is the second index value
- the second interference information is the second If it is an index value, control is performed to stop transmission of the second interference information, the first interference information is the second index value, and the second interference information is the first index.
- control is performed to stop transmission of the second interference information, and the first interference information is the second index value.
- controlling control to transmit the second interference information when the second interference information is the first index value and the value indicating the load of the wireless communication is equal to or greater than the threshold value. Is the gist.
- a seventh feature of the present invention is a communication control method in a radio base station that performs processing for causing the other radio base station to control interference received from a radio terminal connected to the other radio base station, A radio base station measuring a radio communication load in the radio base station; a radio base station measuring interference power received from the radio terminal; and the radio base station measuring the interference Generating interference information that is information related to power; and, based on the measured load of the radio communication, the radio base station transmits the generated interference information to the other radio base station. And a step of controlling.
- 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 the first radio base station according to the embodiment of the present invention.
- FIG. 3 is a diagram illustrating a correspondence relationship between interference information, a traffic volume ratio, and interference information transmission control according to the embodiment of the present invention.
- FIG. 4 is a configuration diagram of the second radio base station according to the embodiment of the present invention.
- FIG. 5 is a flowchart showing a first operation of the first radio base station according to the embodiment of the present invention.
- FIG. 6 is a flowchart showing a second operation of the first radio base station according to the embodiment of the present invention.
- 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 the first radio base station according to the embodiment of the present invention.
- FIG. 3 is a diagram illustrating a correspondence relationship between interference information, a traffic volume ratio, and interference information
- FIG. 7 is a first flowchart showing a third operation of the first radio base station according to the embodiment of the present invention.
- FIG. 8 is a second flowchart showing a third operation of the first radio base station according to the embodiment of the present invention.
- FIG. 9 is a flowchart showing an operation of the second radio base station according to the embodiment of the present invention.
- 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 has, for example, a configuration based on LTE Release 9 which is a 3.9th generation (3.9G) mobile phone system and LTE-Advanced which is positioned as a 4th generation (4G) mobile phone system.
- LTE Release 9 which is a 3.9th generation (3.9G) mobile phone system
- LTE-Advanced which is positioned as a 4th generation (4G) mobile phone system.
- the radio communication system 10 includes a first radio base station 1A that forms a cell 3A and a second radio base station 1B that forms a cell 3B.
- the radius of the cells 3A and 3B is, for example, about several hundreds [m].
- a radio terminal 2A existing in the cell 3A is connected to the first radio base station 1A, and a radio terminal 2B existing in the cell 3B is connected to the second radio base station 1B.
- 1st radio base station 1A and 2nd radio base station 1B are installed in the place based on the station location design which the communication carrier considered the interference between cells.
- the first radio base station 1A and the second radio base station 1B are connected by a dedicated line (not shown) or the like (including a radio connection), and an X2 connection that is a logical transmission path in the transport layer is established. Yes.
- the first radio base station 1A allocates one or more resource blocks (RB: Resource : Block) in the uplink direction and the downlink direction, which are radio resources in the minimum allocation unit, to the radio terminal 2A, and Wireless communication between them.
- the second radio base station 1B allocates one or more resource blocks in the uplink and downlink directions to the radio terminal 2B, and performs radio communication with the radio terminal 2B.
- the uplink used for the wireless communication (the link from the wireless terminal 2A to the first wireless base station 1A, , Referred to as “first uplink”) and used for wireless communication when the second wireless base station 1B and the wireless terminal 2B are connected to perform wireless communication.
- first uplink the link from the wireless terminal 2A to the first wireless base station 1A, , Referred to as “first uplink”
- second uplink the frequency band of the resource block corresponding to the uplink
- the radio terminal 2B The first radio base station 1A performing radio communication with the radio terminal 2A is subject to interference by radio signals transmitted to the two radio base stations 1B using the second uplink. It made.
- the first radio base station 1A when the first radio base station 1A receives interference from the radio terminal 2B, the first radio base station 1A transmits the radio terminal 2B to the second radio base station 1B. Requesting power control, the second radio base station 1B reduces the interference by controlling the transmission power of the radio terminal 2B in response to the request.
- FIG. 2 is a block diagram showing a configuration of the first radio base station 1A.
- the first radio base station 1A includes a control unit 102, a storage unit 103, a wired communication unit 104, a radio communication unit 105, and an antenna unit 107.
- the control unit 102 is configured by a CPU, for example, and controls various functions of the first radio base station 1A.
- the storage unit 103 is configured by a memory, for example, and stores various information used for control and the like in the first radio base station 1A.
- the wired communication unit 104 transmits and receives data to and from the second wireless base station 1B.
- the wireless communication unit 105 is configured using, for example, a radio frequency (RF) circuit, a baseband (BB) circuit, and the like, and transmits and receives a wireless signal to and from the wireless terminal 2A via the antenna unit 107.
- the wireless communication unit 105 performs encoding and modulation of a transmission signal and demodulation and decoding of a reception signal. Further, the wireless communication unit 105 outputs received data obtained by demodulating and decoding the received signal to the control unit 102.
- the wireless communication unit 105 includes an interference power measurement unit 150.
- the control unit 102 includes a communication load measurement unit 152, an interference information generation unit 154, a transmission control unit 156, and a transmission processing unit 158.
- the interference power measurement unit 150 in the radio communication unit 105 receives the second radio signal from the radio terminal 2B to the second radio base station 1B while receiving a radio signal transmitted from the radio terminal 2A using the first uplink.
- the power of interference received by the radio signal transmitted using the uplink is measured.
- the interference power measurement unit 150 uses, as a radio signal, a power of a radio signal component transmitted from the radio terminal 2B to the second radio base station 1B using the second uplink among the received radio signals. Measurement is performed for each of one or a plurality of resource blocks allocated to the terminal 2A.
- the communication load measuring unit 152 in the control unit 102 determines the ratio of the actual traffic volume (traffic volume ratio) to the maximum traffic volume that can be processed in the first radio base station 1A, and the radio communication in the first radio base station 1A. Calculate as the load.
- the communication load measuring unit 152 measures the amount of transmission data output from the control unit 102 to the wireless communication unit 105. Further, the communication load measuring unit 152 calculates the traffic amount ratio by dividing the measured transmission data amount by the predetermined maximum downlink traffic amount that can be processed.
- the communication load measuring unit 152 measures the amount of received data output from the wireless communication unit 105 to the control unit 102. Further, the communication load measuring unit 152 calculates a traffic volume ratio by dividing the measured received data volume by a predetermined maximum traffic volume that can be processed in the uplink direction.
- the maximum downstream traffic volume that can be processed and the maximum upstream traffic volume that can be processed are stored in the storage unit 103.
- the communication load measuring unit 152 increases the calculated traffic amount ratio as the throughput required in the wireless communication between the first wireless base station 1A and the wireless terminal 2A and the required data amount increase. You may correct
- the interference information generation unit 154 in the control unit 102 has binary values of “0” and “1” as OI (Overload Indicator). Interference information is generated. Specifically, when the interference power value for each resource block is equal to or greater than a predetermined value, the interference information generation unit 154 generates “1” indicating that the interference is large as interference information, and the interference power value is If it is less than the predetermined value, “0” indicating that the interference is small is generated as interference information.
- the predetermined value is stored in the storage unit 103 in advance.
- the transmission control unit 156 in the control unit 102 controls the transmission processing unit 158 to transmit interference information to the second radio base station 1B. Specifically, the transmission control unit 156 performs the following first to third transmission controls.
- the transmission control unit 156 determines whether or not the traffic volume ratio is equal to or greater than a threshold value.
- the threshold value is stored in the storage unit 103 in advance.
- the transmission control unit 156 performs control to transmit interference information to the second radio base station 1B.
- the transmission control unit 156 performs control to stop transmission of interference information to the second radio base station 1B.
- the transmission control unit 156 When the transmission control unit 156 performs control to transmit interference information to the second radio base station 1B, the following processing is performed. That is, the interference power measurement unit 150 measures the interference power described above. Further, the interference information generation unit 154 generates the above-described interference information.
- the transmission processing unit 158 transmits the interference information generated by the interference information generation unit 154 to the second radio base station 1B under the control of the transmission control unit 156.
- the transmission processing unit 158 is a wireless signal transmission source included in reception data corresponding to a wireless signal transmitted from the wireless terminal 2B to the second wireless base station 1B using the second uplink.
- the identification information of the radio terminal 2B and the identification information of the second radio base station 1B that is the transmission destination are extracted.
- the transmission processing unit 158 adds the identification information of the resource block corresponding to the interference information and the extracted identification information of the wireless terminal 2B to the interference information for each resource block generated by the interference information generation unit 154. Append.
- the transmission processing unit 158 sets the transmission destination of the interference information for each resource block in the extracted identification information of the second radio base station 1B, and interference information with the identification information of the resource block and the identification information of the radio terminal 2B Is transmitted to the second radio base station 1B via the wired communication unit 104.
- the interference power measurement unit 150 stops the above-described measurement of interference power. Further, the interference information generation unit 154 stops generating the interference information described above. Further, the transmission processing unit 158 stops transmission of interference information to the second radio base station 1B under the control of the transmission control unit 156.
- the second transmission control is transmission control when the second radio base station 1B assumes that no interference occurs in the first radio base station 1A when the second radio base station 1B does not periodically receive the interference information.
- the transmission control unit 156 determines whether or not the traffic volume ratio is equal to or greater than the threshold and the interference information is “1”.
- the traffic volume ratio is equal to or greater than the threshold and the interference information is “1”
- the number of resource blocks that can be allocated by the first radio base station 1A is small, and the interference is large.
- the second radio base station 1B needs to reduce interference by performing control to reduce the transmission power of the radio terminal 2B.
- the transmission control unit 156 performs control to transmit the interference information “1” to the second radio base station 1B in order to request a reduction in the transmission power of the radio terminal 2B.
- the transmission control unit 156 performs control to stop transmission of interference information to the second radio base station 1B when the traffic volume ratio is less than the threshold and when the interference information is “0”. .
- the transmission processing unit 158 controls the interference generated by the interference information generation unit 154 under the control of the transmission control unit 156. Information is transmitted to the second radio base station 1B.
- the transmission processing unit 158 controls the interference information generation unit 154 under the control of the transmission control unit 156. The transmission of the interference information generated by the above to the second radio base station 1B is stopped.
- transmission control of the second interference information is performed according to the first interference information, the second interference information, and the traffic volume ratio.
- the transmission control unit 156 determines whether or not the first interference information is “1”. When the first interference information is “1”, the transmission control unit 156 further determines whether or not the second interference information is “0”. The case where the first interference information is “1” and the second interference information is “0” indicates a case where the interference in the first radio base station 1A is changed from a large state to a small state.
- the second radio base station 1B determines that the first interference information or the interference information that precedes the first interference information and is continuous with the first interference information is “1”. Control is performed to reduce the transmission power of the wireless terminal 2B. However, since the interference at the first radio base station 1A has changed from a large state to a small state, it is no longer necessary to reduce the transmission power of the radio terminal 2B in order to avoid interference. In such a situation, the transmission control unit 156 performs control to transmit the second interference information “0” to the second radio base station 1B regardless of the traffic volume ratio.
- the transmission control unit 156 determines whether or not the traffic volume ratio is less than the threshold.
- the second radio base station 1B determines that the first interference information or the first interference information is Control is performed to reduce the transmission power of the wireless terminal 2B in response to the fact that the interference information continuous with the first interference information is “1” before the wireless terminal 2B.
- the traffic volume ratio is less than the threshold, it is possible to avoid interference or maintain the necessary communication speed by changing the resource block allocated to the radio terminal 2A by the first radio base station 1A.
- the transmission control unit 156 converts the second interference information from “1” to “0”, and transmits “0” as the second interference information to the second radio base station 1B. Take control.
- the second radio base station 1B determines that the first interference information or the first interference information Control is performed to reduce the transmission power of the wireless terminal 2B in response to the fact that the interference information preceding the interference information and continuing to the first interference information is “1”, but the control is continued. Just do it. For this reason, the transmission control unit 156 performs control to stop transmission of the second interference information to the second radio base station 1B.
- the transmission control unit 156 further determines whether or not the second interference information is “0”.
- the second radio base station 1B transmits the first interference information before the first interference information or the first interference information.
- control for reducing the transmission power of the wireless terminal 2B is not performed, but this state may be continued. For this reason, the transmission control unit 156 performs control to stop transmission of the second interference information to the second radio base station 1B.
- the transmission control unit 156 further determines whether or not the traffic amount ratio is less than the threshold value. To do. When the first interference information is “0”, the second interference information is “1”, and the traffic volume ratio is less than the threshold, the second radio base station 1B determines that the first interference information Control that lowers the transmission power of the wireless terminal 2B is not performed in response to the fact that the interference information that precedes the first interference information and is continuous with the first interference information is “0”. On the other hand, although the first radio base station 1A receives interference, it is possible to avoid interference or maintain a necessary communication speed by changing a resource block allocated to the radio terminal 2A. is there. For this reason, the transmission control unit 156 performs control to stop transmission of the second interference information to the second radio base station 1B.
- the second radio base station 1B In response to the fact that the interference information that precedes the first interference information and is continuous with the first interference information is “0”, control for reducing the transmission power of the wireless terminal 2B is not performed.
- the first radio base station 1A receives interference, and it is difficult to avoid the interference or maintain a necessary communication speed by changing a resource block allocated to the radio terminal 2A. is there. In such a situation, the transmission control unit 156 performs control to transmit the second interference information “1” to the second radio base station 1B.
- the transmission processing unit 158 transmits the second interference information to the second radio base station under the control of the transmission control unit 156. Transmit to the base station 1B.
- the transmission processing unit 158 controls the second radio information under the control of the transmission control unit 156. The transmission of the second interference information to the base station 1B is stopped.
- FIG. 4 is a block diagram showing the configuration of the second radio base station 1B.
- the second radio base station 1B includes a control unit 112, a storage unit 113, a wired communication unit 114, a radio communication unit 115, and an antenna unit 117.
- the control unit 112 is constituted by a CPU, for example, and controls various functions provided in the second radio base station 1B.
- the storage unit 113 is configured by a memory, for example, and stores various information used for control and the like in the second radio base station 1B.
- the wired communication unit 114 transmits and receives data to and from the first wireless base station 1A.
- the wireless communication unit 115 is configured using, for example, a radio frequency (RF) circuit, a baseband (BB) circuit, or the like, and transmits and receives a wireless signal to and from the wireless terminal 2B via the antenna unit 117. .
- the wireless communication unit 115 performs encoding and modulation of the transmission signal and demodulation and decoding of the reception signal. Further, the wireless communication unit 115 outputs received data obtained by demodulating and decoding the received signal to the control unit 112.
- the control unit 112 includes a reception processing unit 160 and a wireless terminal transmission power control unit 162.
- the reception processing unit 160 in the control unit 112 receives the interference information for each resource block from the first radio base station 1A via the wired communication unit 114.
- the wireless terminal transmission power control unit 162 in the control unit 112 controls the transmission power of the wireless terminal 2B based on the interference information for each resource block received by the reception processing unit 160.
- the wireless terminal transmission power control unit 162 controls transmission power based on the identification information of the wireless terminal 2B received by the reception processing unit 160 and added to the interference information for each resource block.
- the target wireless terminal 2B is specified.
- the radio terminal transmission power control unit 162 when the interference information is “1”, the radio terminal transmission power control unit 162 generates a transmission power reduction request including the identification information of the resource block added to the interference information.
- the wireless terminal transmission power control unit 162 transmits the generated transmission power reduction request to the wireless terminal 2B via the wireless communication unit 115 and the antenna unit 117.
- the wireless terminal 2B reduces the transmission power for the resource block corresponding to the resource block identification information added to the transmission power reduction request.
- the radio terminal transmission power control unit 162 determines the resource block identification information added to the interference information if the transmission power of the radio terminal 2B is currently reduced. A request to stop the included transmission power reduction is generated.
- the wireless terminal transmission power control unit 162 transmits the generated transmission power reduction stop request to the wireless terminal 2B via the wireless communication unit 115 and the antenna unit 117.
- the wireless terminal 2B stops the transmission power decrease for the resource block corresponding to the resource block identification information added to the transmission power decrease stop request.
- the wireless terminal transmission power control unit 162 stops the control regarding the transmission power of the wireless terminal 2B if the transmission power of the wireless terminal 2B is not decreased at the present time.
- FIG. 5 is a flowchart showing the operation of the first radio base station 1A when the first transmission control is performed.
- step S101 while the first radio base station 1A receives a radio signal transmitted from the radio terminal 2A using the first uplink, the communication load measurement unit 152 in the control unit 102 The ratio of the actual traffic volume to the maximum traffic volume that can be processed in the station 1A (traffic volume ratio) is calculated.
- step S102 the transmission control unit 156 in the control unit 102 determines whether or not the traffic volume ratio is equal to or greater than a threshold value.
- step S103 the transmission control unit 156 performs control to transmit interference information to the second radio base station 1B.
- step S104 the interference power measurement unit 150 in the radio communication unit 105 receives the radio signal transmitted from the radio terminal 2A using the first uplink, while receiving the radio signal from the radio terminal 2B.
- the power of interference received by the radio signal transmitted to the second radio base station 1B using the second uplink is measured for each resource block assigned to the radio terminal 2A.
- step S105 the interference information generation unit 154 in the control unit 102 generates binary interference information “0” and “1” based on the interference power value for each resource block.
- step S106 the transmission processing unit 158 in the control unit 102 transmits the generated interference information to the second radio base station 1B.
- step S107 the transmission control unit 156 performs control to stop transmission of interference information to the second radio base station 1B.
- FIG. 6 is a flowchart showing the operation of the first radio base station 1A when the second transmission control is performed.
- step S111 while the first radio base station 1A receives a radio signal transmitted from the radio terminal 2A using the first uplink, the communication load measurement unit 152 in the control unit 102 The ratio of the actual traffic volume to the maximum traffic volume that can be processed in the station 1A (traffic volume ratio) is calculated.
- step S112 the interference power measurement unit 150 in the radio communication unit 105 receives the radio signal transmitted from the radio terminal 2A using the first uplink. In the meantime, the power of interference received by the radio signal transmitted from the radio terminal 2B to the second radio base station 1B using the second uplink is measured for each resource block assigned to the radio terminal 2A.
- step S113 the interference information generation unit 154 in the control unit 102 generates binary interference information “0” and “1” based on the interference power value for each resource block.
- step S114 the transmission control unit 156 in the control unit 102 determines whether or not the traffic volume ratio calculated in step S111 is equal to or greater than a threshold value and the interference information generated in step S113 is “1”. judge.
- step S115 the transmission control unit 156 performs control to transmit the interference information to the second radio base station 1B.
- step S116 the transmission processing unit 158 in the control unit 102 transmits the interference information generated in step S113 to the second radio base station 1B.
- step S117 the transmission control unit 156 transmits to the second radio base station 1B. To stop transmission of interference information.
- step S121 while the first radio base station 1A receives the radio signal transmitted from the radio terminal 2A using the first uplink, the communication load measurement unit 152 in the control unit 102 The ratio of the actual traffic volume to the maximum traffic volume that can be processed in the station 1A (traffic volume ratio) is calculated.
- step S122 the interference power measurement unit 150 in the radio communication unit 105 receives the radio signal transmitted from the radio terminal 2A using the first uplink by the interference power measurement unit 150 in the radio communication unit 105.
- the power of interference received by the radio signal transmitted from the radio terminal 2B to the second radio base station 1B using the second uplink is measured for each resource block assigned to the radio terminal 2A.
- step S123 the interference information generation unit 154 in the control unit 102 generates second interference information which is a binary value of “0” and “1” based on the interference power value for each resource block.
- step S124 the transmission control unit 156 in the control unit 102 determines whether or not the first interference information generated immediately before the second interference information is “1”. If the first interference information is “1”, in step S125, the transmission control unit 156 determines whether or not the second interference information is “0”.
- step S126 the transmission control unit 156 performs control to transmit the interference information to the second radio base station 1B.
- step S127 the transmission processing unit 158 in the control unit 102 transmits the second interference information generated in step S123 to the second radio base station 1B.
- step S1208 the transmission control unit 156 determines whether or not the traffic amount ratio calculated in step S121 is less than the threshold. judge.
- step S129 the transmission control unit 156 performs control to transmit “0” to the second radio base station 1B as the second interference information.
- step S127 the transmission processing unit 158 in the control unit 102 transmits “0” that is the second interference information to the second radio base station 1B.
- step S130 the transmission control unit 156 performs control to stop transmission of interference information to the second radio base station 1B.
- step S124 determines that the first interference information is “0”. It is determined whether or not.
- step S132 the transmission control unit 156 performs control to stop transmission of the interference information to the second radio base station 1B.
- the transmission control unit 156 determines whether or not the traffic amount ratio calculated in step S121 is less than the threshold.
- step S129 the transmission control unit 156 performs control to stop transmission of interference information to the second radio base station 1B.
- step S130 when the traffic volume ratio is equal to or greater than the threshold, in step S130, the transmission control unit 156 performs control to transmit the second interference information to the second radio base station 1B. In step S135, the transmission processing unit 158 transmits the second interference information to the second radio base station 1B.
- FIG. 9 is a flowchart showing the operation of the second radio base station 1B.
- the reception processing unit 160 in the control unit 112 receives the interference information for each resource block from the first radio base station 1A.
- step S202 the wireless terminal transmission power control unit 162 in the control unit 112 determines whether or not the received interference information is “1”.
- step S203 the wireless terminal transmission power control unit 162 performs control to reduce the transmission power of the wireless terminal 2B.
- step S204 the wireless terminal transmission power control unit 162 determines whether or not the transmission power of the wireless terminal 2B is currently reduced. If the transmission power of the wireless terminal 2B is currently reduced, in step S205, the wireless terminal transmission power control unit 162 performs control to stop the transmission power reduction of the wireless terminal 2B.
- the first radio base station 1A calculates the traffic amount ratio in the first radio base station 1A.
- the first radio base station 1A performs control to transmit interference information when the traffic volume ratio is equal to or greater than the threshold, and under this control, measurement of interference power, interference Information is generated and interference information is transmitted to the second radio base station 1B.
- control for stopping transmission of interference information is performed.
- measurement of interference power, generation of interference information, and transmission to the second radio base station 1B are performed. None of the interference information is transmitted.
- the resource block allocated to the wireless terminal 2A is changed without reducing the transmission power in the wireless terminal 2B that is the source of interference By doing so, it is possible to avoid interference. Therefore, when the traffic volume ratio is equal to or greater than the threshold, the first wireless base station 1A transmits interference information to the second wireless base station 1B, thereby causing wireless communication due to a decrease in transmission power more than necessary in the wireless terminal 2B. It is possible to prevent a reduction in communication capacity of the entire system 10.
- the processing load on the first radio base station 1A is reduced.
- the first radio base station 1A performs control to transmit the interference information when the traffic volume ratio is equal to or greater than the threshold and the interference information is “1”, and the traffic When the amount ratio is less than the threshold and at least one of the interference information is “0”, control for stopping transmission of the interference information is performed.
- the second radio base station 1B does not periodically receive the interference information
- the second transmission control which is transmission control when it is assumed that no interference occurs in the first radio base station 1A
- the traffic volume ratio Is less than the threshold value and at least one of the interference information is “0”
- the first radio base station 1A performs transmission control of the second interference information according to the correspondence relationship between the first interference information, the second interference information, and the traffic amount ratio illustrated in FIG. .
- the third radio base station 1B is the transmission control in the case where the interference situation in the first radio base station 1A is considered to be the same as the previous situation.
- the transmission control the transmission control of the second interference information is performed according to the correspondence relationship between the first interference information, the second interference information, and the traffic amount ratio shown in FIG. While reducing the processing load and communication load, it is possible to prevent a decrease in communication capacity of the entire wireless communication system 10 due to a decrease in transmission power more than necessary in the wireless terminal 2B.
- the first radio base station 1A measures the interference power for each resource block, and further generates and transmits interference information.
- the interference power of all resource blocks allocated to the radio terminal 2A An average value may be calculated, and one piece of interference information corresponding to the average value of the interference power may be generated and transmitted.
- the second radio base station 1B controls the transmission power of the radio terminal 2B based on one piece of interference information, in other words, interference information corresponding to all resource blocks allocated to the radio terminal 2A.
- the load of the radio communication is not limited to the traffic volume ratio in the first radio base station 1A, the resource block usage rate in the first radio base station 1A, the traffic volume itself in the first radio base station 1A, the first radio It may be a processing load associated with wireless communication in the base station 1A.
- the radio communication system 10 is configured based on LTE Release 9 or LTE-Advanced, but may be configured based on other communication standards.
- the radio base station and communication control method of the present invention can prevent a reduction in communication capacity of the entire radio communication system, and are useful as a radio base station and communication control method.
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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。無線通信システム10は、例えば、第3.9世代(3.9G)携帯電話システムであるLTE Release9 や、第4世代(4G)携帯電話システムとして位置づけられているLTE-Advancedに基づく構成を有する。
図2は、第1無線基地局1Aの構成を示すブロック図である。図2に示すように、第1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及びアンテナ部107を有する。
第1の送信制御では、送信制御部156は、トラフィック量比率が閾値以上であるか否かを判定する。ここで、閾値は、予め記憶部103に記憶されている。トラフィック量比率が閾値以上である場合、第1無線基地局1Aは、無線端末2Aに割り当てるリソースブロックを変更すること等によって、干渉を回避すること、あるいは、必要な通信速度を維持することが困難である。この場合、送信制御部156は、第2無線基地局1Bへ干渉情報を送信する制御を行う。一方、トラフィック量比率が閾値未満である場合、第1無線基地局1Aは、無線端末2Aに割り当てるリソースブロックを変更すること等によって、干渉を回避すること、あるいは、必要な通信速度を維持することが可能である。この場合、送信制御部156は、第2無線基地局1Bへの干渉情報の送信を停止する制御を行う。
第2の送信制御は、第2無線基地局1Bが、周期的に干渉情報を受信しない場合には、第1無線基地局1Aにおいて干渉が生じていないと見なす場合における送信制御である。
第3の送信制御は、第2無線基地局1Bが、周期的に干渉情報を受信しない場合には、第1無線基地局1Aにおける干渉の状況が、それまでの状況と同じであると見なす場合における送信制御であり、干渉情報生成部154が、連続する2つの干渉情報を生成する場合、すなわち、第1干渉情報を生成し、続いて第2干渉情報を生成する場合における、第2干渉情報の送信制御である。
図4は、第2無線基地局1Bの構成を示すブロック図である。図4に示すように、第2無線基地局1Bは、制御部112、記憶部113、有線通信部114、無線通信部115及びアンテナ部117を有する。
(2.1)第1無線基地局1Aの動作
図5は、第1の送信制御が行われる場合の第1無線基地局1Aの動作を示すフローチャートである。ステップS101において、第1無線基地局1Aが無線端末2Aから第1上りリンクを用いて送信される無線信号を受信している間、制御部102内の通信負荷測定部152は、第1無線基地局1Aにおける処理可能な最大のトラフィック量に対する、実際のトラフィック量の比率(トラフィック量比率)を算出する。
図9は、第2無線基地局1Bの動作を示すフローチャートである。ステップS201において、制御部112内の受信処理部160は、第1無線基地局1Aからのリソースブロック毎の干渉情報を受信する。
本実施形態における無線通信システム10では、第1無線基地局1Aは、第1無線基地局1Aにおけるトラフィック量比率を算出する。
上記のように、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)
- 他の無線基地局に接続する無線端末から受ける干渉を、前記他の無線基地局に制御させるための処理を行う無線基地局であって、
自無線基地局における無線通信の負荷に基づいて、前記無線端末から受ける干渉電力に関連する情報である干渉情報の前記他の無線基地局への送信を制御する干渉情報送信制御部を備える無線基地局。 - 前記干渉情報送信制御部は、前記無線通信の負荷を示す値が閾値以上である場合に、前記干渉情報を送信する制御を行い、前記無線通信の負荷を示す値が前記閾値未満である場合に、前記干渉情報の送信を停止する制御を行う請求項1に記載の無線基地局。
- 前記干渉情報を生成する干渉情報生成部を更に備え、
前記干渉情報生成部は、前記干渉情報送信制御部によって前記干渉情報を送信する制御が行われる場合に、前記干渉情報を生成し、前記干渉情報送信制御部によって前記干渉情報の送信を停止する制御が行われる場合に、前記干渉情報の生成を停止する請求項1に記載の無線基地局。 - 前記干渉電力を測定する干渉電力測定部を更に備え、
前記干渉電力測定部は、前記干渉情報送信制御部によって前記干渉情報を送信する制御が行われる場合に、前記干渉電力を測定し、前記干渉情報送信制御部によって前記干渉情報の送信を停止する制御が行われる場合に、前記干渉電力の測定を停止する請求項1に記載の無線基地局。 - 前記干渉情報送信制御部は、
前記無線通信の負荷を示す値が閾値以上であり、且つ、前記干渉情報が、対応する前記干渉電力が所定値以上であることを示す第1の指標値である場合に、前記干渉情報を送信する制御を行い、
前記前記無線通信の負荷を示す値が前記閾値未満、及び、前記干渉情報が、対応する前記干渉電力が前記所定値未満であることを示す第2の指標値の少なくとも何れかである場合に、前記干渉情報の送信を停止する制御を行う請求項1に記載の無線基地局。 - 前記干渉情報生成部は、第1の干渉情報及び第2の干渉情報を生成し、
前記干渉情報送信制御部は、
前記第1の干渉情報が、対応する前記干渉電力が所定値以上であることを示す第1の指標値であり、前記第2の干渉情報が、対応する前記干渉電力が前記所定値未満であることを示す第2の指標値である場合に、前記第2の干渉情報を送信する制御を行い、
前記第1の干渉情報が前記第1の指標値であり、前記第2の干渉情報が前記第1の指標値であって、前記無線通信の負荷を示す値が前記閾値未満である場合に、前記第2の指標値を前記第2の干渉情報として送信する制御を行い、
前記第1の干渉情報が前記第1の指標値であり、前記第2の干渉情報が前記第1の指標値であって、前記無線通信の負荷を示す値が前記閾値以上である場合に、前記第2の干渉情報の送信を停止する制御を行い、
前記第1の干渉情報が前記第2の指標値であり、前記第2の干渉情報が前記第2の指標値である場合に、前記第2の干渉情報の送信を停止する制御を行い、
前記第1の干渉情報が前記第2の指標値であり、前記第2の干渉情報が前記第1の指標値であって、前記無線通信の負荷を示す値が前記閾値未満である場合に、前記第2の干渉情報の送信を停止する制御を行い、
前記第1の干渉情報が前記第2の指標値であり、前記第2の干渉情報が前記第1の指標値であって、前記無線通信の負荷を示す値が前記閾値以上である場合に、前記第2の干渉情報を送信する制御を行う請求項1に記載の無線基地局。 - 他の無線基地局に接続する無線端末から受ける干渉を、前記他の無線基地局に制御させるための処理を行う無線基地局における通信制御方法であって、
前記無線基地局が、自無線基地局における無線通信の負荷を測定するステップと、
前記無線基地局が、前記無線端末から受ける干渉電力を測定するステップと、
前記無線基地局が、測定された前記干渉電力に関連する情報である干渉情報を生成するステップと、
前記無線基地局が、測定された前記無線通信の負荷に基づいて、生成された前記干渉情報の前記他の無線基地局への送信を制御するステップと
を備える通信制御方法。
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EP2538731A1 (en) | 2012-12-26 |
JP5466034B2 (ja) | 2014-04-09 |
JP2011166685A (ja) | 2011-08-25 |
EP2538731A4 (en) | 2016-06-08 |
US20120329497A1 (en) | 2012-12-27 |
KR20120108051A (ko) | 2012-10-04 |
CN102763466A (zh) | 2012-10-31 |
US9100923B2 (en) | 2015-08-04 |
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