WO2010110344A1 - 無線通信システム、無線端末、無線基地局、制御装置、及び無線通信方法 - Google Patents
無線通信システム、無線端末、無線基地局、制御装置、及び無線通信方法 Download PDFInfo
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- WO2010110344A1 WO2010110344A1 PCT/JP2010/055128 JP2010055128W WO2010110344A1 WO 2010110344 A1 WO2010110344 A1 WO 2010110344A1 JP 2010055128 W JP2010055128 W JP 2010055128W WO 2010110344 A1 WO2010110344 A1 WO 2010110344A1
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- base station
- radio base
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0056—Inter-base station aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
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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
- H04W88/12—Access point controller devices
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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
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
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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
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
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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
Definitions
- the present invention relates to a wireless communication system, a wireless terminal, a wireless base station, a control device, and a wireless communication method that use the same frequency between adjacent wireless base stations.
- a wide service area is divided into communication area units called cells, and a radio base station responsible for radio communication with radio terminals in the communication area is installed for each communication area. It covers a wide service area.
- the radio terminal mainly at the end of the communication area (cell edge) Under the influence of interference from a station (hereinafter referred to as an adjacent base station), throughput decreases in downlink communication.
- a method called frequency scheduling has been proposed in which a radio terminal is assigned a frequency that is less affected by interference from adjacent base stations to the radio terminal (hereinafter referred to as second background art). Specifically, the radio terminal measures reception quality (for example, reception SINR) for each frequency, and reports a CQI (Channel Quality Indicator) indicating the measurement result to the radio base station. The radio base station allocates to the radio terminal a frequency that is less affected by interference from adjacent base stations, according to the reported CQI (see Non-Patent Document 1).
- reception quality for example, reception SINR
- CQI Channel Quality Indicator
- the wireless base station in a situation where there is a lot of traffic transmitted and received by the wireless base station, such as when the wireless base station performs wireless communication with a large number of wireless terminals, the frequencies that can be allocated to these wireless terminals are insufficient. In this case, there is a problem that the radio base station has to assign a frequency to the radio terminal that is greatly affected by interference from adjacent base stations, and interference cannot be avoided.
- the present invention provides a radio communication system and a radio terminal that can avoid interference from adjacent base stations even when the propagation environment changes after the installation of the radio base station or when the assignable frequency is insufficient.
- An object of the present invention is to provide a radio base station, a control device, and a radio communication method.
- the present invention has the following features.
- the first feature of the present invention is that communication between a first radio base station (for example, radio base station BS_D) that uses a plurality of predetermined frequencies (carrier frequencies) for downlink communication and the first radio base station.
- a first radio base station for example, radio base station BS_D
- predetermined frequencies carrier frequencies
- a wireless terminal for example, wireless terminal UE_C that is located in an area (for example, communication area AR_D) and is connected to the first wireless base station, and a second wireless base station (for example, wireless base station) that uses the plurality of frequencies for downlink communication Station BS_B, radio base station BS_C, radio base station BS_E), and a control device (control device 300) for controlling the first radio base station and the second radio base station, the first radio base station, Transmitting power information indicating an incoming signal power for each frequency from the second radio base station to the radio terminal and position information indicating a position of the radio terminal in the communication area to the control device; Is Based on the power information and the position information received from the first radio base station, an interference position that is a position where the incoming signal power is equal to or greater than a predetermined value in the communication area is specified and arrives at the interference position
- a specifying unit for specifying an interference frequency that is a frequency of a signal, and transmission control information for reducing the
- the signal from the adjacent base station etc.
- a wireless communication system capable of avoiding interference is provided.
- a second feature of the present invention relates to the first feature of the present invention, wherein the transmission control information indicates the interference frequency specified by the specifying unit, and the second radio base station is connected to the control device.
- the gist is to reduce the transmission power of a signal to be transmitted using the interference frequency based on the received transmission control information.
- a third feature of the present invention relates to the first feature of the present invention, wherein the second radio base station includes an array antenna (antennas ANT1 to ANTn) configured using a plurality of antennas, and the transmission control
- the information indicates the interference position specified by the specifying unit or the direction of the interference position, and the second radio base station forms the array antenna based on the transmission control information received from the control device.
- the gist is to direct the directional beam to be directed in a direction different from the direction of the interference position.
- a fourth feature of the present invention relates to the first feature of the present invention, wherein the second radio base station includes a plurality of sector antennas (antennas ANT1 to ANTn) having transmission directivities in different directions, Transmission control information indicates the interference position specified by the specifying unit or the direction of the interference position, and the second radio base station determines the interference position based on the transmission control information received from the control device.
- the gist is to reduce the transmission power of a signal to be transmitted using a sector antenna corresponding to the direction.
- a fifth feature of the present invention is according to the first feature of the present invention, wherein the transmission control information indicates the interference frequency specified by the specifying unit, and the second radio base station receives from the control device The gist is to stop using the interference frequency based on the received transmission control information.
- the sixth feature of the present invention is related to the first feature of the present invention, and is characterized in that the specifying unit specifies a position where the moving average of the incoming signal power is a predetermined value or more as the interference position.
- a seventh feature of the present invention relates to the first feature of the present invention, wherein the first radio base station receives speed information indicating a moving speed of the radio terminal in addition to the power information and the position information. It is transmitted to the control device, and the specifying unit weights the incoming signal power using the speed information received from the first radio base station when specifying the interference position.
- An eighth feature of the present invention is that a radio terminal (radio terminal UE) located in a communication area of a first radio base station that uses a plurality of predetermined frequencies for downlink communication and connected to the first radio base station Power information indicating the arrival signal power at each frequency from the second radio base station to the radio terminal, which is installed within a predetermined range from the first radio base station and uses the plurality of frequencies for downlink communication.
- a radio terminal radio terminal UE located in a communication area of a first radio base station that uses a plurality of predetermined frequencies for downlink communication and connected to the first radio base station Power information indicating the arrival signal power at each frequency from the second radio base station to the radio terminal, which is installed within a predetermined range from the first radio base station and uses the plurality of frequencies for downlink communication.
- the gist is provided with a terminal-side transmission unit (radio communication unit 110) that transmits the power information and the position information generated by the position information generation unit to the first radio base station.
- a ninth feature of the present invention is a radio base station (radio base station BS) that uses a plurality of predetermined frequencies for downlink communication, and is installed within a predetermined range from the radio base station.
- Power information indicating an incoming signal power for each frequency from another radio base station using a frequency for downlink communication to a radio terminal in the communication area of the radio base station, and position information indicating a position of the radio terminal
- the base station side receiving unit (radio communication unit 210) that receives from the radio terminal and the power information and the position information received by the base station side receiving unit control the radio base station and the other radio base stations.
- the gist is to include a base station side transmission unit (wired communication unit 240) that transmits to the control device (control device 300).
- a tenth feature of the present invention is a first radio base station that uses a plurality of predetermined frequencies for downlink communication, and is installed within a predetermined range from the first radio base station, and the plurality of frequencies are transmitted in downlink.
- a control device (control device 300) for controlling the second radio base station used for the transmission, and an incoming signal for each frequency from the second radio base station to a radio terminal in the communication area of the first radio base station
- An apparatus-side receiving unit (wired communication unit 310) that receives power information indicating power and position information indicating the position of the wireless terminal from the first wireless base station, and the power received from the first wireless base station Based on the information and the position information, an interference position which is a position where the incoming signal power is a predetermined value or more in the communication area is specified, and an interference frequency which is a frequency of a signal arriving at the interference position is specified.
- a device-side transmitting unit that transmits transmission control information for reducing the incoming signal power for the interference position and the interference frequency specified by
- An eleventh feature of the present invention is to request transmission of power information indicating an incoming signal power for each frequency to a wireless terminal in the communication area of the first wireless base station and position information indicating the position of the wireless terminal. Transmitting a transmission request for transmitting from the first radio base station to the radio terminal, receiving the transmission request from the first radio base station by the radio terminal, and the power information and the position information.
- the gist of the present invention is a wireless communication method comprising a step of transmitting from the wireless terminal to the first wireless base station and a step of receiving the transmission request from the wireless terminal by the first wireless base station.
- a twelfth feature of the present invention is that the power information indicating the arrival signal power for each frequency to the wireless terminal in the communication area of the first wireless base station, and the position information indicating the position of the wireless terminal are Transmitting from the radio base station to a control device that controls the first radio base station and the second radio base station; receiving the power information and the position information from the first radio base station; The control device transmits, to the second radio base station, transmission control information for reducing the incoming signal power based on the power information and the position information received from the first radio base station by the control device.
- a wireless communication method comprising the steps of:
- the radio communication system and the radio terminal capable of avoiding interference from adjacent base stations .
- a radio base station, a control apparatus, and a radio communication method can be provided.
- FIG. 1 is an overall configuration diagram of a radio communication system according to an embodiment of the present invention.
- FIG. 2 is a diagram for explaining a propagation environment in the wireless communication system according to the embodiment of the present invention.
- FIG. 3 is a functional block diagram showing the configuration of the wireless terminal according to the embodiment of the present invention.
- FIG. 4 is a functional block diagram showing the configuration of the radio base station according to the embodiment of the present invention.
- FIG. 5 is a functional block diagram showing the configuration of the control device according to the embodiment of the present invention.
- FIG. 6 is a sequence diagram showing an overall operation sequence of the radio communication system according to the embodiment of the present invention.
- FIG. 7 is a flowchart showing an operation flow of the wireless terminal according to the embodiment of the present invention.
- FIG. 8 is a flowchart showing an operation flow of the control device according to the embodiment of the present invention.
- FIG. 9 is a diagram for explaining a specific operation example of the control device according to the embodiment of the present invention.
- FIG. 1 is an overall configuration diagram of a radio communication system 10 according to the present embodiment.
- the wireless communication system 10 has, for example, a configuration based on LTE (Long Term Evolution) standardized in 3GPP (3rd Generation Partnership Project) or WiMAX standardized in IEEE 802.16.
- LTE Long Term Evolution
- 3GPP Third Generation Partnership Project
- WiMAX WiMAX
- IEEE 802.16 IEEE 802.16
- a wide service area is divided into communication area units called cells, and a radio base station responsible for radio communication with radio terminals in the communication area is installed for each communication area. Covers the area.
- the radio communication system 10 includes a radio base station BS_A, a radio base station BS_B, a radio base station BS_C, a radio base station BS_D, and a radio base station BS_E.
- Communication area AR_D and communication area AR_E are formed.
- the same frequency is used in the radio base stations BS_A to BS_E.
- the radio communication system 10 employs an orthogonal frequency division multiple access (OFDMA) system, which is one of the multicarrier communication systems.
- OFDMA orthogonal frequency division multiple access
- a channel called a subchannel is configured using a plurality of subcarriers orthogonal to each other, and the channel is allocated from a radio base station to a radio terminal.
- carrier frequency the frequency of the channel allocated to the wireless terminal.
- the radio terminal UE_A in the communication area AR_A is wirelessly connected to the radio base station BS_A.
- the radio terminal UE_A receives a desired signal coming from the radio base station BS_A (see FIG. 2A).
- the radio terminal UE_B located in the overlapping part of the communication area AR_B and the communication area AR_D is wirelessly connected to the radio base station BS_B.
- the radio terminal UE_B receives an interference signal coming from the radio base station BS_D in addition to the desired signal coming from the radio base station BS_B (see FIG. 2B).
- the radio terminal UE_C located in the overlapping portion of the communication area AR_C, the communication area AR_D, and the communication area AR_E is wirelessly connected to the radio base station BS_D.
- the radio terminal UE_C receives an interference signal arriving from each of the radio base station BS_C and the radio base station BS_E in addition to the desired signal arriving from the radio base station BS_D (see FIG. 2C).
- the power of the signal arriving at each of the radio terminals UE_A to UE_C differs for each carrier frequency due to the influence of frequency selective fading.
- the control device 300 is connected to each of the radio base station BS_A to the radio base station BS_E.
- the control device 300 is a server that is provided on a backhaul network that is a wired communication network and controls the radio base stations BS_A to BS_E.
- each of the radio base station BS_A to the radio base station BS_E will be collectively referred to as “radio base station BS” as appropriate.
- Each of the radio terminals UE_A to UE_C is collectively referred to as “radio terminal UE” as appropriate.
- the radio terminal UE analyzes a signal received from the connection-destination radio base station BS, and periodically transmits feedback information corresponding to the analysis result to the connection-destination radio base station BS.
- the feedback information includes the CQI described above.
- the radio base station BS performs transmission power control, adaptive modulation control, frequency scheduling, and the like based on the CQI received from the radio terminal UE.
- RIC Radio Information Channel
- FIG. 3 is a functional block diagram showing the configuration of the radio terminal UE.
- the radio terminal UE includes a radio communication unit 110, a GPS receiver 120, a control unit 130, and a storage unit 140.
- the wireless communication unit 110 transmits and receives wireless signals via the antenna 101.
- the GPS receiver 120 receives a GPS (Global Positioning System) signal.
- the control unit 130 is configured by a CPU, for example, and controls various functions provided in the radio terminal UE.
- the storage unit 140 is configured by a memory, for example, and stores various types of information used for control and the like in the radio terminal UE.
- the signal received from the radio base station BS by the radio communication unit 110 includes a base station ID (cell ID) for identifying the radio base station BS.
- the radio communication unit 110 measures the power (arrival signal power) for each carrier frequency of the signal. Note that the radio communication unit 110 may further measure the power (arrival signal power) for each carrier frequency of a signal arriving from the connected radio base station BS.
- the control unit 130 includes a power information generation unit 131, a position information generation unit 132, and a speed information generation unit 133.
- the power information generation unit 131 generates power information indicating the incoming signal power measured by the wireless communication unit 110 for each carrier frequency.
- the power information includes a value indicating the incoming signal power measured for each carrier frequency by the wireless communication unit 110 and a base station ID for identifying the wireless base station BS that is the source of the incoming signal.
- the position information generation unit 132 generates position information indicating the geographical position of the radio terminal UE based on the GPS signal received by the GPS receiver 120.
- the speed information generation unit 133 generates speed information indicating the moving speed of the radio terminal UE based on the position information generated by the position information generation unit 132. For example, the position change amount of the radio terminal UE per unit time can be used as the speed information.
- the wireless communication unit 110 connects the RIC including the power information generated by the power information generation unit 131, the position information generated by the position information generation unit 132, and the speed information generated by the speed information generation unit 133.
- the terminal side transmission part which transmits to previous radio base station BS is comprised.
- the timing at which the radio communication unit 110 transmits RIC (position information, power information, speed information) to the connection-destination radio base station BS may be the same timing as the CQI transmission or a different timing.
- the radio communication unit 110 and the control unit 130 may transmit the RIC when transmission of the RIC is requested from the connection-destination radio base station BS.
- FIG. 4 is a functional block diagram showing the configuration of the radio base station BS.
- the radio base station BS includes a plurality of antennas ANT1 to ANTn, a radio communication unit 210, a control unit 220, a storage unit 230, and a wired communication unit 240 (n ⁇ 2).
- the wireless communication unit 210 transmits and receives wireless signals via the antennas ANT1 to ANTn.
- the radio communication unit 210 constitutes a base station side receiving unit that receives RIC (position information, power information, speed information) from the radio terminal UE.
- Antennas ANT1 to ANTn are array antennas or sector antennas. When the antennas ANT1 to ANTn are array antennas, a directional beam is formed using the antennas ANT1 to ANTn. When each of the antennas ANT1 to ANTn is a sector antenna, each of the antennas ANT1 to ANTn has transmission directivity in a different direction.
- the control unit 220 is configured by a CPU, for example, and controls various functions provided in the radio base station BS.
- the storage unit 230 is configured by a memory, for example, and stores various information used for control in the radio base station BS.
- the wired communication unit 240 is connected to the control device 300 via a wired communication network.
- the control unit 220 includes a transfer control unit 221, an allocation control unit 222, and a transmission control unit 223.
- the transfer control unit 221 transfers the RIC received by the wireless communication unit 210 from the wireless terminal UE to the control device 300 via the wired communication unit 240.
- the transfer control unit 221 temporarily stores the RIC received from the radio terminal UE in the storage unit 230, and collectively transfers the plurality of RICs stored in the storage unit 230 to the control device 300 as an RIC report.
- the wired communication unit 240 constitutes a base station side transmission unit that transmits the RIC to the control device 300.
- the allocation control unit 222 allocates a channel to the radio terminal UE. For example, based on the CQI received by the radio communication unit 210 from the radio terminal UE, the allocation control unit 222 allocates to the radio terminal UE a carrier frequency that is less affected by the interference that the radio terminal UE receives from the adjacent base station.
- the transmission control unit 223 uses the transmission power of the signal transmitted to the radio terminal UE as a carrier. Control for each frequency. Details of the control information will be described later.
- the transmission control unit 223 can also control the directivity of the antennas ANT1 to ANTn.
- the transmission control unit 223 dynamically changes the direction in which the directional beam is directed by weighting signals transmitted from the antennas ANT1 to ANTn.
- the transmission control unit 223 controls transmission power of a signal transmitted from each of the antennas ANT1 to ANTn.
- the sector antenna is an antenna having fixed transmission directivity in different directions.
- FIG. 5 is a functional block diagram showing the configuration of the control device 300.
- the control device 300 includes a wired communication unit 310, a control unit 320, a storage unit 330, and a display unit 340.
- the wired communication unit 310 is connected to the radio base station BS via a wired communication network.
- the wired communication unit 310 constitutes a device-side receiving unit that receives RIC (position information, power information, speed information) from the radio base station BS.
- the control part 320 is comprised by CPU, for example, and controls the various functions with which the control apparatus 300 is provided.
- the storage unit 330 is configured by a memory, for example, and stores various types of information used for control in the control device 300.
- the display unit 340 is controlled by the control unit 320 and displays various types of information.
- the control unit 320 includes a specifying unit 321 and a transmission control information generating unit 322.
- the specifying unit 321 determines that the incoming signal power from other radio base stations BS is a predetermined value in the communication area of the radio base station BS.
- the interference position which is the above position is specified, and the interference frequency which is the carrier frequency of the signal arriving at the interference position from another radio base station BS is specified.
- the specifying unit 321 may specify a position where the moving average of the incoming signal power is a predetermined value or more as the interference position. Specifically, the specifying unit 321 calculates an average value of each incoming signal power in a past fixed period, and specifies an interference position where the average value is a predetermined value or more. Further, the specifying unit 321 specifies the radio base station BS as an interference source based on the base station ID included in the power information.
- the identifying unit 321 may weight the incoming signal power using the velocity information included in the RIC when identifying the interference position. Specifically, since the RIC from the radio terminal UE having a high moving speed has low reliability, the incoming signal power is multiplied by a smaller weighting factor as the moving speed is higher. When the weight coefficient is set to 0, the incoming signal power is not used for specifying the interference position and the interference frequency.
- the transmission control information generating unit 322 generates transmission control information for reducing the incoming signal power for the interference position and interference frequency specified by the specifying unit 321.
- the transmission control information is information indicating at least one of the interference position (or the direction of the interference position) specified by the specifying unit 321 or the interference frequency, for example.
- the wired communication unit 310 constitutes a device-side transmission unit that transmits the transmission control information generated by the transmission control information generation unit 322.
- the display unit 340 displays the RIC (position information, power information, speed information) received by the wired communication unit 310, or displays information on the interference position and interference frequency specified by the specifying unit 321. Thereby, the operator can grasp
- FIG. 6 is a sequence diagram showing an overall operation sequence of the wireless communication system 10.
- radio communication between the radio base station BS_A and the radio terminal UE_A and radio communication between the radio base station BS_B and the radio terminal UE_B will be described.
- step S101 the radio base station BS_A and the radio terminal UE_A perform downlink (DL) communication and uplink (UL) communication.
- DL downlink
- UL uplink
- the radio terminal UE_A transmits a UL Idle notification for interrupting UL communication to the radio base station BS_A.
- the radio base station BS_A transmits an RIC request for requesting transmission of the RIC to the radio terminal UE_A.
- the radio terminal UE_A transmits the RIC to the radio base station BS_A.
- step S103 the radio base station BS_A transmits an RIC report for reporting the RIC to the control device 300.
- the radio terminal UE_B transmits a UL Idle notification for interrupting UL communication to the radio base station BS_B.
- the radio base station BS_B transmits an RIC request for requesting transmission of the RIC to the radio terminal UE_B.
- the radio terminal UE_B transmits the RIC to the radio base station BS_B.
- step S105 the radio base station BS_B transmits an RIC report for reporting the RIC to the control device 300.
- step S106 the control device 300 transmits the transmission control information to the radio base station BS_A and the radio base station BS_B.
- FIG. 7 is a flowchart showing an operation flow of the radio terminal UE.
- step S201 the control unit 130 of the radio terminal UE determines whether it is a UL idle state in which UL communication is interrupted or a DL idle state in which DL communication is interrupted. If it is in the UL ⁇ ⁇ ⁇ ⁇ Idle state, the process proceeds to step S210. If it is in the DL Idle state, the process proceeds to step S202.
- step S202 the control unit 130 of the radio terminal UE sets the number of transmission source BSs that represents the number of transmission-source radio base stations BS of the signal received by the radio communication unit 110, and the signal received by the radio communication unit 110.
- the carrier number representing the carrier frequency of is initialized.
- step S203 the control unit 130 of the radio terminal UE determines whether or not the number of transmission source BSs is greater than one. If the number of source BSs is greater than 1, the process proceeds to step S205. If the number of source BSs is 1 or less, the process proceeds to step S204. In step S204, the process returns to step S201 after a randomly set waiting time has elapsed.
- step S205 the radio communication unit 110 of the radio terminal UE measures the power of the signal corresponding to the carrier number (arrival signal power).
- step S206 the power information generation unit 131 of the radio terminal UE stores the power (arrival signal power) measured by the radio communication unit 110 in the storage unit 140 in association with the carrier number and the base station ID. Thereafter, 1 is added to the carrier number.
- step S205 and step S206 is repeatedly performed until the carrier number reaches the total number of carriers. When the carrier number reaches the total number of carriers, the process returns to step S201.
- the position information generated by the position information generation unit 132 and the speed information generated by the speed information generation unit 133 are also stored in the storage unit 140.
- step S210 the control unit 130 of the radio terminal UE determines whether or not the radio communication unit 110 has received an RIC request from the radio base station BS. If the RIC request has been received, the process proceeds to step S211. If the RIC request has not been received, the process returns to step S201.
- step S211 the control unit 130 of the radio terminal UE reads the power information, the position information, and the speed information stored in the storage unit 140 and passes them to the radio communication unit 110.
- the radio communication unit 110 transmits an RIC including power information, position information, and speed information to the radio base station BS.
- FIG. 8 is a flowchart showing an operation flow of the control device 300.
- step S301 the wired communication unit 310 of the control device 300 receives an RIC report including at least one RIC from the radio base station BS.
- step S302 the specifying unit 321 of the control device 300 weights the incoming signal power in the power information using the speed information included in each RIC.
- step S303 the specifying unit 321 of the control device 300 causes the storage unit 330 to store the position information and the weighted power information. Specifically, the specifying unit 321 stores position information and weighted power information in the storage unit 330 for each of the plurality of RICs.
- step S304 the specifying unit 321 of the control device 300 calculates a moving average of the power information stored in the storage unit 330. In other words, since there is a high possibility that old information is different from the current propagation environment, an average of power information from the present time to a certain past period is obtained.
- step S305 the specifying unit 321 of the control device 300 determines whether or not the incoming signal power is greater than or equal to a predetermined value for each position and each carrier frequency based on the position information and power information stored in the storage unit 330. judge. If there is a position and carrier frequency at which the incoming signal power is greater than or equal to the predetermined value, the process proceeds to step S306. If there is no position and carrier frequency at which the incoming signal power is greater than or equal to the predetermined value, the process proceeds to step S306. Return to S301.
- step S306 the specifying unit 321 of the control device 300 specifies a position where the incoming signal power is a predetermined value or more as an interference position, specifies a carrier frequency where the incoming signal power is a predetermined value or more as an interference frequency, and sets the predetermined value.
- the transmission source radio base station having the above arrival signal power is specified as the interference source radio base station.
- step S307 the transmission control information generating unit 322 of the control device 300 generates transmission control information for reducing the incoming signal power for the interference position and interference frequency specified by the specifying unit 321.
- step S308 the wired communication unit 310 of the control device 300 transmits the transmission control information generated by the transmission control information generating unit 322 to the interference source radio base station specified by the specifying unit 321.
- FIG. 9 is a diagram for explaining a specific operation example of the control device 300.
- each of the communication areas of the radio base station BS_2, the radio base station BS_3, and the radio base station BS_4 partially overlaps with the communication area of the radio base station BS_1.
- FIG. 9A shows the radio base station BS_1 and the radio base station BS_2.
- a service area constituted by a plurality of communication areas is logically divided into a plurality of position areas.
- Each position area is given an ID (hereinafter, position ID) corresponding to the coordinates in the X direction and the Y direction.
- the specifying unit 321 of the control device 300 creates power tables T1 to T4 as shown in FIG. 9B for the communication area of the radio base station BS_1 based on the RIC. Each of the power tables T1 to T4 associates the incoming signal power for each carrier frequency (carrier number) with the transmission source radio base station for each position ID.
- the specifying unit 321 stores the created power table in the storage unit 330.
- the power table T1 indicates that a signal transmitted using the frequency of the carrier number 2 from the radio base station BS_2 arrives at the power “a” in the position area where the position ID is XY. When the power “a” is 0, it means that no signal actually arrives.
- the specifying unit 321 creates a power table for final determination as shown in FIG. 9C by performing weighting according to speed information and moving average processing on the power tables T1 to T4. To do.
- the identifying unit 321 compares each incoming signal power in the power table for final determination with a predetermined value, and if it is greater than or equal to the predetermined value, it is subject to transmission control (transmission power limitation).
- the transmission control unit 223 of the radio base station BS controls transmission by at least one of the following methods (a) to (c).
- the transmission control unit 223 reduces the transmission power of the signal transmitted using the interference frequency based on the transmission control information received from the control device 300. Alternatively, the transmission control unit 223 stops using the interference frequency. In this case, information (for example, carrier number) indicating the interference frequency specified by the control device 300 is used as transmission control information.
- the transmission control unit 223 uses the transmission control information received from the control device 300 to generate directional beams formed by the antennas ANT1 to ANTn (array antennas) as interference positions. Direct in a different direction.
- information indicating the interference position specified by the control device 300 for example, position ID
- information indicating the direction of the interference position is used as transmission control information.
- the transmission control unit 223 uses any one of the antennas ANT1 to ANTn corresponding to the direction of the interference position based on the transmission control information received from the control device 300. Reduce the transmission power of the transmitted signal.
- information indicating the interference position specified by the control device 300 for example, position ID
- information indicating the direction of the interference position is used as transmission control information.
- the transmission control methods (a) to (c) may be properly used.
- the method (b) or (c) may be applied for a period of time after the installation of the radio base station BS, and the method (a) may be applied after the period has elapsed.
- the radio base station BS that has received the transmission control information performs transmission control for reducing the incoming signal power for the interference position and the interference frequency.
- the position information is generated using GPS.
- the present invention is not limited to the case where position information is generated using GPS, and existing techniques such as triangulation using a wireless base station are used.
- position information may be generated.
- the speed information is generated using GPS.
- the speed information is not limited to the case where speed information is generated using GPS, but a method of estimating the moving speed using a fading frequency, Alternatively, the moving speed may be estimated using the number of communication area shifts per unit time.
- the power information, the position information, and the speed information are included in the RIC.
- the present invention is not necessarily limited to the case where all of these three pieces of information are included.
- the speed information may be excluded from the RIC.
- the power information, the position information, and the speed information are not limited to being transmitted and received in the RIC, but the power information, the position information, and the speed information may be individually transmitted and received.
- the radio communication system, the radio terminal, the radio base station, the control apparatus, and the radio communication method according to the present invention are insufficient when the propagation environment changes after installation of the radio base station or the frequency that can be allocated is insufficient. Even if this occurs, interference from adjacent base stations can be avoided, which is useful in wireless communications such as mobile communications.
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Abstract
Description
図1は、本実施形態に係る無線通信システム10の全体構成図である。
次に、無線通信システム10の詳細構成について、(2.1)無線端末の構成、(2.2)無線基地局の構成、(2.3)制御装置の構成の順に説明する。なお、以下においては、本発明に関連する構成について主に説明する。
図3は、無線端末UEの構成を示す機能ブロック図である。
図4は、無線基地局BSの構成を示す機能ブロック図である。
図5は、制御装置300の構成を示す機能ブロック図である。
次に、無線通信システム10の動作について、(3.1)全体動作、(3.2)無線端末の動作、(3.3)制御装置の動作の順に説明する。
図6は、無線通信システム10の全体動作シーケンスを示すシーケンス図である。
図7は、無線端末UEの動作フローを示すフローチャートである。
図8は、制御装置300の動作フローを示すフローチャートである。
次に、送信制御情報を受信した無線基地局BSにおける送信制御動作について説明する。
以上説明したように、本実施形態では、送信制御情報を受信した無線基地局BSが、干渉位置及び干渉周波数について到来信号電力を低下させるための送信制御を行う。
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 (12)
- 予め定められた複数の周波数を下り通信に使用する第1無線基地局と、
前記第1無線基地局の通信エリア内に位置し、前記第1無線基地局に接続する無線端末と、
前記複数の周波数を下り通信に使用する第2無線基地局と、
前記第1無線基地局及び前記第2無線基地局を制御する制御装置と
を備え、
前記第1無線基地局は、前記第2無線基地局から前記無線端末への周波数毎の到来信号電力を示す電力情報と、前記通信エリア内の前記無線端末の位置を示す位置情報とを前記制御装置に送信し、
前記制御装置は、
前記第1無線基地局から受信した前記電力情報及び前記位置情報に基づいて、前記通信エリアにおいて前記到来信号電力が所定値以上となる位置である干渉位置を特定するとともに、前記干渉位置に到来する信号の周波数である干渉周波数を特定する特定部と、
前記特定部によって特定された前記干渉位置及び前記干渉周波数について前記到来信号電力を低下させるための送信制御情報を前記第2無線基地局に送信する装置側送信部と
を備える無線通信システム。 - 前記送信制御情報は、前記特定部によって特定された前記干渉周波数を示し、
前記第2無線基地局は、前記制御装置から受信した前記送信制御情報に基づいて、前記干渉周波数を用いて送信する信号の送信電力を低下させる請求項1に記載の無線通信システム。 - 前記第2無線基地局は、複数のアンテナを用いて構成されるアレイアンテナを備え、
前記送信制御情報は、前記特定部によって特定された前記干渉位置、又は前記干渉位置の方向を示し、
前記第2無線基地局は、前記制御装置から受信した前記送信制御情報に基づいて、前記アレイアンテナが形成する指向性ビームを前記干渉位置の方向と異なる方向に向ける請求項1に記載の無線通信システム。 - 前記第2無線基地局は、それぞれ異なる方向に送信指向性を有する複数のセクタアンテナを備え、
前記送信制御情報は、前記特定部によって特定された前記干渉位置、又は前記干渉位置の方向を示し、
前記第2無線基地局は、前記制御装置から受信した前記送信制御情報に基づいて、前記干渉位置の方向に対応するセクタアンテナを用いて送信する信号の送信電力を低下させる請求項1に記載の無線通信システム。 - 前記送信制御情報は、前記特定部によって特定された前記干渉周波数を示し、
前記第2無線基地局は、前記制御装置から受信した前記送信制御情報に基づいて、前記干渉周波数の使用を中止する請求項1に記載の無線通信システム。 - 前記特定部は、前記到来信号電力の移動平均が所定値以上の位置を前記干渉位置として特定する請求項1に記載の無線通信システム。
- 前記第1無線基地局は、前記電力情報及び前記位置情報に加えて、前記無線端末の移動速度を示す速度情報を前記制御装置に送信し、
前記特定部は、前記干渉位置を特定する際に、前記第1無線基地局から受信した前記速度情報を用いて、前記到来信号電力の重み付けを行う請求項1に記載の無線通信システム。 - 予め定められた複数の周波数を下り通信に使用する第1無線基地局の通信エリア内に位置し、前記第1無線基地局に接続する無線端末であって、
前記第1無線基地局から所定範囲内に設置され、前記複数の周波数を下り通信に使用する第2無線基地局から前記無線端末への周波数毎の到来信号電力を示す電力情報を生成する電力情報生成部と、
前記無線端末の位置を示す位置情報を生成する位置情報生成部と、
前記電力情報生成部によって生成された前記電力情報と、前記位置情報生成部によって生成された前記位置情報とを前記第1無線基地局に送信する端末側送信部と
を備える無線端末。 - 予め定められた複数の周波数を下り通信に使用する無線基地局であって、
前記複数の周波数を下り通信に使用する他の無線基地局から前記無線基地局の通信エリア内の無線端末への周波数毎の到来信号電力を示す電力情報と、前記無線端末の位置を示す位置情報とを前記無線端末から受信する基地局側受信部と、
前記基地局側受信部が受信した前記電力情報及び前記位置情報を、前記無線基地局及び前記他の無線基地局を制御する制御装置に送信する基地局側送信部と
を備える無線基地局。 - 予め定められた複数の周波数を下り通信に使用する第1無線基地局と、前記複数の周波数を下り通信に使用する第2無線基地局とを制御する制御装置であって、
前記第2無線基地局から前記第1無線基地局の通信エリア内の無線端末への周波数毎の到来信号電力を示す電力情報と、前記無線端末の位置を示す位置情報とを前記第1無線基地局から受信する装置側受信部と、
前記第1無線基地局から受信した前記電力情報及び前記位置情報に基づいて、前記通信エリアにおいて前記到来信号電力が所定値以上となる位置である干渉位置を特定するとともに、前記干渉位置に到来する信号の周波数である干渉周波数を特定する特定部と、
前記特定部によって特定された前記干渉位置及び前記干渉周波数について前記到来信号電力を低下させるための送信制御情報を前記第2無線基地局に送信する装置側送信部と
を備える制御装置。 - 第1無線基地局の通信エリア内の無線端末への周波数毎の到来信号電力を示す電力情報と、前記無線端末の位置を示す位置情報との送信を要求するための送信要求を前記第1無線基地局から前記無線端末へ送信するステップと、
前記無線端末が前記送信要求を前記第1無線基地局から受信するステップと、
前記電力情報と前記位置情報とを前記無線端末から前記第1無線基地局へ送信するステップと、
前記第1無線基地局が前記送信要求を前記無線端末から受信するステップと
を備える無線通信方法。 - 第1無線基地局の通信エリア内の無線端末への周波数毎の到来信号電力を示す電力情報と、前記無線端末の位置を示す位置情報とを、前記第1無線基地局から、前記第1無線基地局及び前記第2無線基地局を制御する制御装置に送信するステップと、
前記制御装置が、前記第1無線基地局から前記電力情報及び前記位置情報を受信するステップと、
前記制御装置が、前記第1無線基地局から受信した前記電力情報及び前記位置情報に基づいて、前記到来信号電力を低下させるための送信制御情報を前記第2無線基地局に送信するステップと
を備える無線通信方法。
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JP2011023949A (ja) * | 2009-07-15 | 2011-02-03 | Nec Casio Mobile Communications Ltd | 通信端末装置、サーバ、および、プログラム |
JP2012120063A (ja) * | 2010-12-03 | 2012-06-21 | Hitachi Ltd | アンテナ送信電力制御を行う無線基地局装置 |
JP2012147259A (ja) * | 2011-01-12 | 2012-08-02 | National Institute Of Information & Communication Technology | 無線通信ネットワーク間の通信共存システム |
JP2018523364A (ja) * | 2015-06-12 | 2018-08-16 | テレフオンアクチーボラゲット エルエム エリクソン(パブル) | ネットワークノードが複数のビームをサポートするセルラネットワークにおけるビーム切替 |
US10615861B2 (en) | 2015-06-12 | 2020-04-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Beam switching in a cellular network where the network nodes support a plurality of beams |
US11005554B2 (en) | 2015-06-12 | 2021-05-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobility for beam-forming systems |
JP2019013053A (ja) * | 2018-10-25 | 2019-01-24 | 沖電気工業株式会社 | 無線通信システム、送信電力制御方法および無線通信装置 |
Also Published As
Publication number | Publication date |
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EP2413624A4 (en) | 2013-04-10 |
EP2413624A1 (en) | 2012-02-01 |
JP2014222944A (ja) | 2014-11-27 |
KR101330744B1 (ko) | 2013-11-18 |
JPWO2010110344A1 (ja) | 2012-10-04 |
KR20110124323A (ko) | 2011-11-16 |
CN102362518A (zh) | 2012-02-22 |
US20120157138A1 (en) | 2012-06-21 |
JP2014014164A (ja) | 2014-01-23 |
US8606191B2 (en) | 2013-12-10 |
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