WO2011096147A1 - 無線通信システム、無線基地局および協調制御方法 - Google Patents
無線通信システム、無線基地局および協調制御方法 Download PDFInfo
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- WO2011096147A1 WO2011096147A1 PCT/JP2010/073152 JP2010073152W WO2011096147A1 WO 2011096147 A1 WO2011096147 A1 WO 2011096147A1 JP 2010073152 W JP2010073152 W JP 2010073152W WO 2011096147 A1 WO2011096147 A1 WO 2011096147A1
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- radio base
- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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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
- H04W16/24—Cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a radio communication system, a radio base station, and a cooperative control method.
- Patent Document 1 Japanese Patent Laid-Open No. 8-198415
- a terminal such as a mobile phone that communicates via a user
- a terminal that communicates without involving a user
- a machine terminal a terminal that communicates without involving a user
- M2M Machine to Machine
- M2M communication data transmission / reception (upload, download, etc.) is regularly performed (once a day or once every several hours), and it is often sufficient to be able to transmit / receive data as a result. Therefore, a certain amount of communication delay or disconnection is allowed, and the required communication quality is lowered.
- each of the plurality of radio base stations is referred to as a normal radio base station
- a radio base station having the same area as the cover area of the plurality of normal radio base stations is referred to as a centralized management type radio base station.
- a network having a normal radio base station and a centralized radio base station has the following two characteristics.
- the first characteristic is that the normal radio base station and the centralized management type radio base station are assigned the same frequency band and transmit data within the frequency band.
- the second feature is that a normal radio base station communicates with a user terminal, and a centralized management type radio base station communicates with a machine terminal.
- FIG. 1A is a diagram illustrating an example of a configuration of a frame in which a wireless base station transmits data in an LTE (Long Term Evolution) scheme.
- LTE Long Term Evolution
- a radio base station transmits data in a subframe, and transmits the subframe using a frequency within a frequency band assigned to the own station in units of subcarriers.
- the normal radio base station and the centralized management type radio base station transmit subframes using the same subcarrier in the same time zone as shown in FIG. 1B, the transmission waves of each other become interference. Data cannot be sent.
- An object of the present invention is to provide a wireless communication system, a wireless base station, and a cooperative control method that can solve the above-described problems.
- the wireless communication system of the present invention provides: A plurality of first radio base stations that transmit data using a frequency within a predetermined frequency band by placing data in a frame to a first terminal located in the coverage area of the own station; The same area as the coverage area of the plurality of first radio base stations is defined as the coverage area of the local station, and data is loaded on the frame for the second terminal located in the coverage area of the local station, and the predetermined frequency band A second radio base station that transmits using a frequency within the Each of the plurality of first radio base stations notifies the second radio base station of the transmission timing of a frame that the local station transmits to the first terminal, The second radio base station is notified of the transmission timing of a frame to be transmitted to the second terminal from the first radio base station that covers a cover area where the second terminal is located. Synchronize with the transmission timing.
- the radio base station of the present invention provides: A wireless base station that transmits data in a frame and transmits it using a frequency within a predetermined frequency band to a first terminal located in the coverage area of the local station, Centralized management in which the same area as the coverage area of the radio base station is used as a coverage area, and data is transmitted in a frame to a second terminal located in the coverage area of the local station using a frequency within the predetermined frequency band.
- a control unit that notifies the wireless base station of the transmission timing of the own frame.
- the cooperative control method of the present invention provides: The first radio base station and the second radio base station use the same area as a cover area, and put data in a frame for the first terminal and the second terminal using frequencies in the same frequency band, respectively.
- the first radio base station is a cooperative control method for cooperating with the second radio base station,
- the first radio base station notifies the second radio base station of the transmission timing of its own frame.
- the first radio base station serves as the first terminal located in the cover area of the own station, with respect to the second radio base station having the same area as the cover area of the own station.
- the second radio base station notifies the transmission timing of the frame to be transmitted, and the second radio base station covers the transmission timing of the frame to be transmitted to the second terminal, covering the coverage area where the second terminal is located. Synchronize with the transmission timing notified from the station.
- the transmission timing of the frame can be synchronized between the two radio base stations.
- FIG. 3 is a block diagram showing a configuration of a centralized management type radio base station shown in FIG. 2. It is a block diagram which shows the structure of RF transmitter / receiver shown in FIG. FIG. 3 is a diagram for explaining the operation of the wireless communication system shown in FIG. 2.
- FIG. 5 is a sequence diagram showing an example of the operation of the wireless communication system when the centralized management type radio base station shown in FIG. 4 is activated.
- FIG. 5 is a sequence diagram illustrating an example of an operation of the wireless communication system when the normal wireless base station illustrated in FIG. 4 is activated.
- FIG. 5 is a sequence diagram illustrating an example of an operation of the wireless communication system when the normal wireless base station illustrated in FIG. 4 is activated.
- FIG. 5 is a sequence diagram showing an example of the operation of the wireless communication system when the centralized management type radio base station shown in FIG. 4 is activated.
- FIG. 5 is a sequence diagram showing an example of the operation of the wireless communication system when the centralized management type radio base station shown in FIG. 4 is activated.
- FIG. 5 is a sequence diagram illustrating an example of an operation of the wireless communication system when the normal wireless base station illustrated in FIG. 4 is activated.
- FIG. 5 is a sequence diagram illustrating an example of an operation of the wireless communication system when the normal wireless base station illustrated in FIG. 4 is activated. It is a figure for demonstrating operation
- FIG. 13 is a sequence diagram showing an example of the operation of the wireless communication system when the centralized management type radio base station shown in FIG. 12 is activated.
- FIG. 13 is a sequence diagram showing an example of the operation of the wireless communication system when the normal wireless base station shown in FIG. 12 is activated.
- FIG. 13 is a sequence diagram showing an example of the operation of the wireless communication system when the normal wireless base station shown in FIG. 12 is activated.
- FIG. 13 is a sequence diagram showing an example of the operation of the wireless communication system when the centralized management type radio base station shown in FIG. 12 is activated.
- FIG. 13 is a sequence diagram showing an example of the operation of the wireless communication system when the normal wireless base station shown in FIG. 12 is activated.
- FIG. 13 is a sequence diagram showing an example of the operation of the wireless communication system when the normal wireless base station shown in FIG. 12 is activated. It is a figure for demonstrating operation
- FIG. 20 is a sequence diagram showing an example of the operation of the wireless communication system when the centralized management type radio base station shown in FIG. 19 is activated.
- FIG. 20 is a sequence diagram showing an example of the operation of the wireless communication system when the normal wireless base station shown in FIG. 19 is activated. It is a figure which shows an example of allocation of the subcarrier to the centralized management type radio base station.
- FIG. 2 is a diagram illustrating the configuration of the wireless communication system according to the first embodiment of this invention.
- the radio communication system shown in FIG. 2 includes normal radio base stations 10 to 12, centrally managed radio base stations 30 and 31, RF transceivers 50 to 58, SGW (Serving Gate Way) 71, and PGW (PDN Gate). Way) 72, MME (Mobility Management Entity) 73, and AAA / HSS (Authentication, Authorization, Accounting / Home Subscriber Server) 74.
- the normal radio base station 10 is connected to the RF transceivers 50 to 52, covers the areas 60 to 62, and transmits / receives data to / from user terminals located in the cover areas 60 to 62. Specifically, for example, when transmitting data to a user terminal located in the coverage area 60, the normal radio base station 10 generates data to be transmitted to the user terminal and outputs the data to the RF transceiver 50. The data is transmitted via the RF transceiver 50. Further, data transmitted from the user terminal located in the cover area 60 is received by the RF transceiver 50 and output to the normal radio base station 10.
- the normal radio base stations 11 and 12 are different from the normal radio base station 10 only in the RF transmitter / receiver to be connected, and thus detailed description thereof will be omitted below.
- the centralized radio base station 30 is connected to the RF transceivers 50 to 58, covers the areas 60 to 68, and transmits / receives data to / from machine terminals located in the cover areas 60 to 68. Accordingly, the centralized management type radio base station 30 is connected to the same RF transceivers 50 to 58 as the normal radio base stations 10 to 12, and the same area as the cover area of the normal radio base stations 10 to 12 is set as the cover area.
- the centralized management type radio base station 31 is different from the centralized management type radio base station 30 only in the RF transmitter / receiver to be connected, and therefore, detailed description thereof will be omitted below.
- the centralized radio base station 30 also transmits / receives data to / from the machine terminal via the connected RF transceiver.
- the centralized management type radio base station 30 is connected to the centralized management type radio base station 31 and the normal radio base station 10 via the X2 interface. Further, the normal radio base station 10 and the centralized management type radio base station 30 are connected to the SGW 71 and the MME 73 via the S1 interface.
- the RF transceiver 50 transmits / receives data between the normal radio base station 10 and user terminals located in the cover area 60 and between the centralized management type radio base station 30 and machine terminals located in the cover area 60. Amplify the data to be transmitted. Since the RF transceivers 51 to 58 have the same configuration and operation as the RF transceiver 50, detailed description thereof will be omitted below.
- Each of the SGW 71, PGW 72, MME 73, and AAA / HSS 74 is a device on the core network side that performs data transfer, terminal connection to an external network, terminal movement management, terminal authentication and information management, and the like. Since it is well known to those skilled in the art and is not directly related to the present invention, a detailed description is omitted.
- FIG. 3A is a block diagram showing a configuration of the normal radio base station 10.
- the normal radio base station 10 illustrated in FIG. 3A includes a control unit 101, a baseband processing unit 102, and a time information acquisition unit 103.
- the control unit 101 normally controls the operation of the entire radio base station 10 and performs, for example, call processing, maintenance monitoring processing, and the like.
- the baseband processing unit 102 performs baseband processing such as decoding and encoding of data transmitted / received between the normal radio base station 10 and the RF transceiver 50.
- the time information acquisition unit 103 acquires a reference time from a GPS (Global Positioning System) or NTP (Network Time Protocol) server, etc., acquires time information indicating the transmission timing of the local station based on the reference time, and the time information Is output to the control unit 101.
- GPS Global Positioning System
- NTP Network Time Protocol
- FIG. 3B is a block diagram showing a configuration of the centralized management type radio base station 30.
- 3B includes a control unit 301, a baseband processing unit 302, and a time information acquisition unit 303.
- the control unit 301 controls the overall operation of the centralized radio base station 30, and performs, for example, call processing, maintenance monitoring processing, and the like.
- the baseband processing unit 302 performs baseband processing of data transmitted / received between the centralized management type radio base station 30 and the RF transceiver 50.
- the time information acquisition unit 303 acquires a reference time from a GPS or NTP server or the like, acquires time information indicating the transmission timing of the own station based on the reference time, and outputs the time information to the control unit 301.
- FIG. 3C is a block diagram showing the configuration of the RF transceiver 50. As shown in FIG.
- 3C includes a normal radio base station amplifier unit 501 and a centralized management type radio base station amplifier unit 502.
- the normal radio base station amplifier 501 amplifies data transmitted and received between the normal radio base station 10 and the user terminal via an antenna (not shown).
- the centralized management type radio base station amplifier 502 amplifies data transmitted / received between the centralized management type radio base station 30 and the machine terminal via an antenna (not shown), and the normal radio base station amplifier 501.
- the data transmitted via is monitored via the monitoring interface 503.
- the normal radio base station 10 determines assignment of subframes to be transmitted by the centralized management type radio base station 30 with data as shown in FIG. 5, and subframes other than the assigned subframes. It is assumed that the centralized radio base station 30 transmits the data in the assigned subframe.
- the radio base stations since it is necessary to synchronize the transmission timing between the two radio base stations each time the normal radio base station 10 and the centralized management radio base station 30 are activated (or restarted), the radio base stations will be described below. The operation will be described separately when the station is started.
- FIG. 6 is a sequence diagram showing an operation of synchronizing transmission timing when the centralized management type radio base station 30 is activated.
- the control unit 301 of the centralized management type radio base station 30 transmits an X2 SETUP REQUEST message to the normal radio base stations 10 to 12 at startup (step S101) (step S102).
- X2 SETUP REQUEST message “Timing Information Request” IE is added as a new information element, so that the control unit 301 requests time information indicating the frame transmission timing from the normal radio base stations 10 to 12. Set this IE to Active.
- the time information acquisition unit 103 of the normal radio base station 10 receives the X2 SETUP REQUEST message transmitted from the centralized radio base station 30, the time information acquisition unit 103 refers to the “Timing Information Request” IE, and when this IE is Active, Time information is acquired by converting the transmission timing of the local station based on the reference time acquired from a GPS, NTP server, or the like. And the control part 101 transmits X2 SETUP RESPONSE message which is a response message to the centralized management type
- “Timing Information” IE is added as a new information element, and the control unit 101 uses the time information acquired by the time information acquisition unit 103 and the identification information of the own station in this IE. Set a certain Cell ID.
- control unit 301 of the centralized radio base station 30 When the control unit 301 of the centralized radio base station 30 receives the X2 SETUP RESPONSE message transmitted from the normal radio base stations 10 to 12, it is based on the Cell ID set in the “Timing Information” IE and the time information. The transmission timing is synchronized with each normal radio base station.
- FIG. 7 is a sequence diagram showing an operation of synchronizing transmission timing when the normal radio base station 10 is activated.
- the time information acquisition unit 103 of the normal radio base station 10 acquires time information at startup (step S201), and the control unit 101 transmits an X2 SETUP REQUEST message to the centralized management type radio base station 30 (step S202).
- X2 SETUP REQUEST message “Timing Information” IE is added as a new information element, and the control unit 101 sets the time information acquired by the time information acquisition unit 103 and the Cell ID in this IE. .
- the control unit 301 of the centralized management type radio base station 30 Upon receiving the X2 SETUP REQUEST message transmitted from the normal radio base station 10, the control unit 301 of the centralized management type radio base station 30 receives the normal radio base station 10 based on the time information set in the “Timing Information” IE.
- the X2 SETUP RESPONSE message is transmitted to the normal radio base station 10 (step S203).
- FIG. 8 is a sequence diagram showing other operations for synchronizing transmission timing when the normal radio base station 10 is started.
- the control unit 101 of the normal radio base station 10 transmits an X2 SETUP REQUEST message to the centralized management type radio base station 30 at the time of activation (step S301) (step S302), and the control unit 301 of the centralized management type radio base station 30
- the X2 SETUP REQUEST message is received, the X2 SETUP RESPONSE message is transmitted to the normal radio base station 10 (step S303).
- a “Timing Information Request” IE is added as a new information element, and the control unit 301 sets this IE to Active in order to request time information.
- the time information acquisition unit 103 of the normal radio base station 10 receives the X2 SETUP RESPONSE message transmitted from the centralized management type radio base station 30, it refers to the “Timing Information Request” IE, and when this IE is Active, The time information is acquired, and the control unit 101 transmits an ENB CONFIGURATION UPDATE message to the centralized management type radio base station 30 (step S304).
- “Timing Information” IE is added as a new information element, and the control unit 101 sets the time information acquired by the time information acquisition unit 103 and the Cell ID in this IE. .
- the control unit 301 of the centralized management type radio base station 30 When receiving the ENB CONFIGURATION UPDATE message transmitted from the normal radio base station 10, the control unit 301 of the centralized management type radio base station 30 receives the normal radio base station 10 based on the time information set in the “Timing Information” IE.
- the ENB CONFIGURATION ACKNOWLEDGE message is transmitted to the normal radio base station 10 (step S305).
- the notification to the user terminal and the machine terminal is performed only from one of the normal radio base station 10 and the centrally managed radio base station 30, and the radio base station that performs the notification is the master base station. Called. In the following, it is assumed that the normal radio base station 10 is a master base station.
- FIG. 9 is a sequence diagram showing an operation of subframe allocation when the centralized management type radio base station 30 is activated.
- the control unit 301 of the centralized management type radio base station 30 transmits an X2 SETUP REQUEST message to the normal radio base stations 10 to 12 at startup (step S401) (step S402).
- X2 SETUP REQUEST message “Access Resource Information Request” IE is added as a new information element, and the control unit 301 sets this IE to Active in order to request subframe allocation.
- the control unit 101 of the normal radio base station 10 receives the X2 SETUP REQUEST message transmitted from the centralized management type radio base station 30, the control unit 101 refers to the “Access Resource Information Request” IE.
- a subframe to be allocated to the management type radio base station 30 is determined, and an X2 SETUP RESPONSE message is transmitted to the centralized management type radio base station 30 (step S403).
- “Access Resource Information” IE is added as a new information element, and the control unit 101 sets the subframe number and Cell ID of the allocated subframe in this IE.
- control unit 101 of the normal radio base station 10 notifies the user terminal and machine terminal located in the cover areas 60 to 62 of the subframe number of the assigned subframe using broadcast information including the subframe number.
- a RRC: System Information message is sent. Specifically, “SubframeConfig for centralized management type radio base station” IE is added as a new information element to the System Information Block Type 2 message, and the normal radio base station 10 adds the subframe of the subframe assigned to this IE. Set the number.
- the control unit 301 of the centralized management type radio base station 30 receives the X2 SETUP RESPONSE message transmitted from the normal radio base stations 10 to 12, and the Cell ID set in the “Access Resource Information” IE is, for example, normal In the case of indicating the radio base station 10, data is placed in the subframe allocated from the normal radio base station 10 and transmitted to the machine terminals located in the cover areas 60 to 62.
- the transmission timing is synchronized between the normal radio base station 10 and the centralized management type radio base station 30, and the centralized management type radio base station 30 is assigned to the own station from the transmission timing. Since the timing for transmitting the assigned subframe can be obtained, the radio base station that transmits data can be switched at the start and end timing of the assigned subframe, and the occurrence of interference can be prevented.
- FIG. 10 is a sequence diagram showing an operation of subframe allocation when the normal radio base station 10 is activated.
- the control unit 101 of the normal radio base station 10 determines a subframe to be allocated to the centralized management type radio base station 30 at the time of activation (step S501), and transmits an X2 SETUP REQUEST message to the centralized management type radio base station 30 (step S501). S502).
- “Access Resource Information” IE is added as a new information element, and the control unit 101 sets the subframe number and Cell ID of the allocated subframe in this IE.
- control unit 101 transmits the RRC: System Information message with the subframe number of the assigned subframe.
- the control unit 301 of the centralized management type radio base station 30 Upon receiving the X2 SETUP REQUEST message transmitted from the normal radio base station 10, the control unit 301 of the centralized management type radio base station 30 transmits an X2 SETUP RESPONSE message to the normal radio base station 10 (step S503).
- data is placed in the subframe allocated from the radio base station 10 and transmitted to the machine terminals located in the cover areas 60 to 62.
- FIG. 11 is a sequence diagram showing other operations of subframe allocation at startup of the normal radio base station 10.
- the control unit 101 of the normal radio base station 10 transmits an X2 SETUP REQUEST message to the centralized management type radio base station 30 (step S602) at startup (step S601), and the control unit 301 of the centralized management type radio base station 30
- the X2 SETUP REQUEST message is received
- the X2 SETUP RESPONSE message is transmitted to the normal radio base station 10 (step S603).
- “Access Resource Information Request” IE is added as a new information element, and the control unit 301 sets this IE to Active in order to request subframe allocation.
- the control unit 101 of the normal radio base station 10 receives the X2 SETUP RESPONSE message transmitted from the centralized management type radio base station 30, the control unit 101 refers to the “Access Resource Information Request” IE, and if this IE is Active, the control unit 101 A subframe to be allocated to the management type radio base station 30 is determined, and an ENB CONFIGURATION UPDATE message is transmitted to the centralized management type radio base station 30 (step S604).
- “Access Resource Information” IE is added as a new information element, and the control unit 101 sets the subframe number and Cell ID of the allocated subframe in this IE.
- control unit 101 transmits the RRC: System Information message with the subframe number of the assigned subframe.
- the control unit 301 of the centralized management type radio base station 30 Upon receiving the ENB CONFIGURATION UPDATE message transmitted from the normal radio base station 10, the control unit 301 of the centralized management type radio base station 30 transmits an ENB CONFIGURATION ACKNOWLEDGE message to the normal radio base station 10 (step S605).
- data is placed in the subframe allocated from the radio base station 10 and transmitted to the machine terminals located in the cover areas 60 to 62.
- the normal radio base station 10 transmits the time information indicating the transmission timing of the frame to the centralized management type radio base station 30, and the centralized management type radio base station 30 includes the time information. Based on this, the transmission timing is synchronized with the normal radio base station 10 and data is transmitted in the subframe allocated from the normal radio base station 10.
- the normal radio base station 10 and the centralized management type radio base station 30 do not transmit data in the same time zone, it is possible to prevent data from being unable to be transmitted due to interference.
- the normal radio base station 10 transmits broadcast information indicating a subframe assigned to the centralized management type radio base station 30 to the user terminal and the machine terminal.
- broadcast information for user terminals and broadcast information for machine terminals are unified, and each terminal can smoothly connect to a radio base station.
- the normal radio base station 10 and the centralized management radio base station 30 notify information via the MME 73 via the S1 interface. The point is different.
- the configurations of the normal radio base stations 10 to 12, the centralized management radio base station 30, and the RF transceivers 50 to 58 are the same as those in the first embodiment, and a description thereof will be omitted.
- FIG. 13 is a sequence diagram showing an operation for synchronizing transmission timing when the centralized management type radio base station 30 is started up.
- the control unit 301 of the centralized management type radio base station 30 transmits an S1 SETUP REQUEST message to the MME 73 at startup (step S701) (step S702).
- a “Timing Information Request” IE is added as a new information element, and the control unit 301 sets this IE to Active in order to request time information.
- the MME 73 When the MME 73 receives the S1 SETUP REQUEST message transmitted from the centralized management type radio base station 30, the MME 73 refers to the “Timing Information Request” IE, and when this IE is Active, the MME CONFIGURATION UPDATE message is sent to the normal radio base station 10 To 12 (step S703). In this MME CONFIGURATION UPDATE message, a “Timing Information Request” IE is added as a new information element, and the MME 73 sets this IE to Active.
- the time information acquisition unit 103 of the normal radio base station 10 receives the MME CONFIGURATION UPDATE message transmitted from the MME 73, the time information acquisition unit 103 refers to the “Timing Information Request” IE, and acquires time information when this IE is Active.
- the control unit 101 transmits an MME CONFIGURATION UPDATE ACKNOWLEDGE message to the MME 73 (step S704).
- “Timing Information” IE is added as a new information element, and the control unit 101 sets the time information acquired by the time information acquisition unit 103 and the Cell ID in this IE. To do.
- the MME 73 When the MME 73 receives the MME CONFIGURATION ACKNOWLEDGE message normally transmitted from the radio base station 10, the MME 73 transmits an S1 SETUP RESPONSE message to the centralized radio base station 30 (step S705).
- S1 SETUP RESPONSE message “Timing Information” IE is added as a new information element.
- the MME 73 adds the time information, Cell ID, and time information set in the “Timing Information” IE of the MME CONFIGURATION ACKNOWLEDGE message to this IE. Set.
- the control unit 301 of the centralized management type radio base station 30 When receiving the S1 SETUP RESPONSE message transmitted from the MME 73, the control unit 301 of the centralized management type radio base station 30 receives each normal radio base station based on the Cell ID and time information set in the “Timing Information” IE. Synchronize the transmission timing with.
- FIG. 14 is a sequence diagram showing an operation of synchronizing transmission timing when the normal radio base station 10 is started up.
- the time information acquisition unit 103 of the normal radio base station 10 acquires time information at startup (step S801), and the control unit 101 transmits an S1 SETUP REQUEST message to the MME 73 (step S802).
- a “Timing Information” IE is added as a new information element, and the control unit 101 sets the time information acquired by the time information acquisition unit 103 and the Cell ID in this IE. .
- the MME 73 When the MME 73 receives the S1 SETUP REQUEST message normally transmitted from the radio base station 10, the MME 73 transmits an MME CONFIGURATION UPDATE message to the centralized radio base station 30 (step S803).
- MME CONFIGURATION UPDATE message “Timing Information” IE is added as a new information element, and MME 73 adds the time information and Cell ID set in this IE to the “Timing Information” IE of the S1 SETUP REQUEST message. Set.
- FIG. 15 is a sequence diagram showing other operations for synchronizing transmission timing when the normal radio base station 10 is started up.
- the control unit 101 of the normal radio base station 10 sends an S1 SETUP REQUEST message to the MME 73 at start-up (step S901) (step S902). It transmits to the radio base station 10 (step S903).
- S1 SETUP RESPONSE message a “Timing Information Request” IE is added as a new information element, and the MME 73 sets this IE to Active in order to request time information.
- the time information acquisition unit 103 of the normal radio base station 10 receives the S1 SETUP RESPONSE message transmitted from the MME 73, the time information acquisition unit 103 refers to the “Timing Information Request” IE, and acquires time information when this IE is Active.
- the control unit 101 transmits an ENB CONFIGURATION UPDATE message to the MME 73 (step S904).
- “Timing Information” IE is added as a new information element, and the control unit 101 sets the time information acquired by the time information acquisition unit 103 and the Cell ID in this IE. .
- control unit 301 of the centralized management type radio base station 30 synchronizes transmission timing with the normal radio base station 10.
- the MME 73 when the MME 73 receives the MME CONFIGURATION UPDATE ACKNOWLEDGE message transmitted from the centralized management type radio base station 30, the MME 73 transmits an ENB CONFIGURATION ACKNOWLEDGE message to the normal radio base station 10 (step S905).
- FIG. 16 is a sequence diagram showing an operation of subframe allocation when the centralized management type radio base station 30 is started up.
- the control unit 301 of the centralized management type radio base station 30 transmits an S1 SETUP REQUEST message to the MME 73 at the time of activation (step S1001) (step S1002).
- S1 SETUP REQUEST message an “Access Resource Information Request” IE is added as a new information element, and the control unit 301 sets this IE to Active in order to request subframe allocation.
- the MME 73 When the MME 73 receives the S1 SETUP REQUEST message sent from the centralized management type radio base station 30, the MME 73 refers to the “Access Resource Information Request” IE, and when this IE is Active, the MME CONFIGURATION UPDATE message is normally sent to the radio base station. 10 to 12 (step S1003). In this MME CONFIGURATION UPDATE message, “Access Resource Information Request” IE is added as a new information element, and the MME 73 sets this IE to Active.
- the control unit 101 of the normal radio base station 10 When the control unit 101 of the normal radio base station 10 receives the MME CONFIGURATION UPDATE message transmitted from the MME 73, the control unit 101 refers to the “Access Resource Information Request” IE, and when this IE is Active, the centralized radio base station 30 A subframe to be allocated to the MME 73 is determined, and an MME CONFIGURATION UPDATE ACKNOWLEDGE message is transmitted to the MME 73 (step S1004). In this MME CONFIGURATION UPDATE ACKNOWLEDGE message, “Access Resource Information” IE is added as a new information element, and the control unit 101 sets the subframe number and Cell ID of the allocated subframe in this IE.
- control unit 101 transmits the RRC: System Information message with the subframe number of the assigned subframe.
- the MME 73 When the MME 73 receives the MME CONFIGURATION UPDATE ACKNOWLEDGE message normally transmitted from the radio base station 10, the MME 73 transmits an S1 SETUP RESPONSE message to the centralized management type radio base station 30 (step S1005).
- the “Access Resource Information” IE is added as a new information element, and the MME 73 adds the Subframe number and Cell set in the “Access Resource Information” IE of the MME CONFIGURATION ACKNOWLEDGE message to this IE. Set the ID.
- the control unit 301 of the centralized management type radio base station 30 receives the S1 SETUP RESPONSE message transmitted from the MME 73, and the Cell ID set in the “Access Resource Information” IE indicates, for example, the normal radio base station 10 In this case, data is placed in the subframe allocated from the normal radio base station 10 and transmitted to the machine terminals located in the cover areas 60 to 62.
- FIG. 17 is a sequence diagram showing an operation of subframe allocation when the normal radio base station 10 is activated.
- the control unit 101 of the normal radio base station 10 determines a subframe to be allocated to the centralized management type radio base station 30 at the time of activation (step S1101), and transmits an S1 SETUP REQUEST message to the MME 73 (step S1102).
- S1 SETUP REQUEST message “Access Resource Information” IE is added as a new information element, and the control unit 101 sets the subframe number and Cell ID of the allocated subframe in this IE.
- control unit 101 of the normal radio base station 10 transmits the RRC: System Information message with the subframe number of the assigned subframe.
- the MME 73 When the MME 73 receives the S1 SETUP REQUEST message normally transmitted from the radio base station 10, the MME 73 transmits an MME CONFIGURATION UPDATE message to the centralized radio base station 30 (step S1103).
- MME CONFIGURATION UPDATE message “Access Resource Information” IE is added as a new information element, and MME 73 adds the Subframe number and Cell set in the “Access Resource Information” IE of the S1 SETUP REQUEST message to this IE. Set the ID.
- the control unit 301 of the centralized management type radio base station 30 When receiving the MME CONFIGURATION UPDATE message transmitted from the MME 73, the control unit 301 of the centralized management type radio base station 30 transmits an MME CONFIGURATION UPDATE ACKNOWLEDGE message to the MME 73 (step S1104) and assigned from the normal radio base station 10 The data is placed in the subframes and transmitted to the machine terminals located in the cover areas 60 to 62.
- the MME 73 When the MME 73 receives the MME CONFIGURATION UPDATE ACKNOWLEDGE message transmitted from the centralized management type radio base station 30, the MME 73 transmits an S1 SETUP RESPONSE message to the normal radio base station 10 (step S1105).
- FIG. 18 is a sequence diagram showing other operations of subframe allocation at startup of the normal radio base station 10.
- the control unit 101 of the normal radio base station 10 transmits an S1 SETUP REQUEST message to the MME 73 at startup (step S1201) (step S1202).
- the control unit 101 of the wireless base station 10 receives the transmitted S1 SETUP REQUEST message
- the control unit 101 of the wireless base station 10 The message is transmitted to the normal radio base station 10 (step S1203).
- an “Access Resource Information Request” IE is added as a new information element, and the MME 73 sets this IE to Active in order to request subframe allocation.
- the control unit 101 of the normal radio base station 10 When the control unit 101 of the normal radio base station 10 receives the S1 SETUP RESPONSE message transmitted from the MME 73, the control unit 101 refers to the “Access Resource Information Request” IE, and when this IE is Active, the centralized radio base station 30 A subframe to be allocated to the EMB is determined, and an ENB CONFIGURATION UPDATE message is transmitted to the MME 73 (step S1204). In this ENB CONFIGURATION UPDATE message, “Access Resource Information” IE is added as a new information element, and the control unit 101 sets the subframe number and Cell ID of the allocated subframe in this IE.
- the MME 73 When the MME 73 receives the ENB CONFIGURATION UPDATE message normally transmitted from the radio base station 10, the MME 73 transmits the MME CONFIGURATION UPDATE message to the centralized radio base station 30 (step S1205).
- MME CONFIGURATION UPDATE message “Access Resource Information” IE is added as a new information element, and MME 73 adds the Subframe number and Cell set in the “Access Resource Information” IE of the ENB CONFIGURATION UPDATE message to this IE. Set the ID.
- the control unit 301 of the centralized management type radio base station 30 When receiving the MME CONFIGURATION UPDATE message transmitted from the MME 73, the control unit 301 of the centralized management type radio base station 30 transmits an MME CONFIGURATION UPDATE ACKNOWLEDGE message to the MME 73 (step S1206) and assigned from the normal radio base station 10 The data is placed in the subframes and transmitted to the machine terminals located in the cover areas 60 to 62.
- the MME 73 When the MME 73 receives the MME CONFIGURATION UPDATE ACKNOWLEDGE message transmitted from the centralized management type radio base station 30, the MME 73 transmits an ENB CONFIGURATION ACKNOWLEDGE message to the normal radio base station 10 (step S1207).
- the normal radio base station 10 and the centralized management type radio base station 30 notify information via the MME 73 which is a higher station.
- transmission timing synchronization and subframe allocation between the normal radio base station 10 and the centralized radio base station 30 can be performed without notifying information via the X2 interface.
- the normal radio base station 10 and the centralized management type radio base station 30 are connected to only one RF transceiver 50. Further, the configurations of the normal radio base station 10, the centralized management type radio base station 30, and the RF transceiver 50 are the same as those in the first and second embodiments, and thus description thereof is omitted.
- FIG. 20 is a sequence diagram showing an operation of synchronizing transmission timing when the centralized management type radio base station 30 is activated.
- the control unit 101 of the normal radio base station 10 transmits synchronization information (time information) indicating the transmission timing to the user terminals located in the cover areas 60 to 62 via the normal radio base station amplifier unit 501 via the synchronization channel. To do.
- step S1301 the control unit 301 of the centralized management type radio base station 30 provisionally determines the transmission timing, notifies the centralized management type radio base station amplifier unit 502 of the provisionally determined transmission timing, A synchronization information confirmation request for requesting correction information indicating the temporarily determined transmission timing correction amount is transmitted (step S1302).
- the centralized management type radio base station amplifier unit 502 of the RF transceiver 50 transmits the synchronization transmitted via the normal radio base station amplifier unit 501.
- Information is monitored (step S1303). Further, the centralized management type radio base station amplifier unit 502 is based on the monitored synchronization information so that the transmission timing is synchronized between the normal radio base station 10 and the centralized management type radio base station 30.
- the correction amount of the transmission timing notified from the base station 30 is calculated, and correction information indicating the calculated correction amount is output to the centralized management type radio base station 30 (step S1304).
- the control unit 301 of the centralized management type radio base station 30 corrects the provisionally determined transmission timing based on the correction information output from the RF transceiver 50.
- FIG. 21 is a sequence diagram showing an operation of synchronizing transmission timing when the normal radio base station 10 is activated.
- the centralized management type radio base station amplifier 502 of the RF transceiver 50 always monitors the synchronization information transmitted through the normal radio base station amplifier 501 (steps S1401 and S1402). In steps S1401 and S1402, the normal radio base station 300 is not activated and the synchronization information is not transmitted.
- the centralized management type radio base station amplifier unit 502 monitors the synchronization information. Then, based on the monitored synchronization information, the correction amount of the transmission timing notified from the centralized management type radio base station 30 is calculated, and the correction information is output to the centralized management type radio base station 30 (step S1405). .
- the control unit 301 of the centralized management type radio base station 30 corrects the provisionally determined transmission timing based on the correction information output from the RF transceiver 50.
- the centralized radio base station 30 sets the transmission timing with the normal radio base station 10 based on the transmission timing of the normal radio base station 10 notified from the RF transceiver 50. Synchronize.
- the transmission timing can be synchronized between the normal radio base station 10 and the centralized management type radio base station 30 without notifying information necessary for synchronization of the transmission timing via the X2 interface or the S1 interface.
- the present embodiment has been described using an example of calculating the correction amount of the transmission timing provisionally determined by the centralized radio base station 30, the present invention is not limited to this, and synchronization information indicates The transmission timing of the normal radio base station 10 is notified to the centralized management type radio base station 30, and the centralized management type radio base station 30 synchronizes the transmission timing with the normal radio base station 10 based on the notification. May be.
- the normal radio base station 10 notifies the centralized management type radio base station 30 of the assigned subframe, and transmits data to the user terminal using subcarriers other than the assigned subcarrier, thereby providing the centralized management type radio base station.
- the base station 30 transmits data to the machine terminal using subcarriers assigned from the normal radio base station 10.
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Abstract
Description
自局のカバーエリアに在圏する第1の端末に対し、データをフレームに載せて所定の周波数帯域内の周波数を用いて送信する複数の第1の無線基地局と、
前記複数の第1の無線基地局のカバーエリアと同じエリアを自局のカバーエリアとし、自局のカバーエリアに在圏する第2の端末に対し、データをフレームに載せて前記所定の周波数帯域内の周波数を用いて送信する第2の無線基地局と、を備え、
前記複数の第1の無線基地局の各々は、自局が前記第1の端末に対して送信するフレームの送信タイミングを前記第2の無線基地局に通知し、
前記第2の無線基地局は、前記第2の端末に対して送信するフレームの送信タイミングを、該第2の端末が在圏するカバーエリアをカバーする前記第1の無線基地局から通知された送信タイミングに同期させる。
自局のカバーエリアに在圏する第1の端末に対し、データをフレームに載せて所定の周波数帯域内の周波数を用いて送信する無線基地局であって、
前記無線基地局のカバーエリアと同じエリアをカバーエリアとし、前記所定の周波数帯域内の周波数を用いて自局のカバーエリアに在圏する第2の端末にデータをフレームに載せて送信する集中管理型無線基地局に対し、自局のフレームの送信タイミングを通知する制御部を有する。
第1の無線基地局および第2の無線基地局が、同じエリアをカバーエリアとし、同じ周波数帯域内の周波数を用いてそれぞれ第1の端末および第2の端末に対してデータをフレームに載せて送信する場合において、前記第1の無線基地局が前記第2の無線基地局と協調するための協調制御方法であって、
前記第1の無線基地局が、前記第2の無線基地局に自局のフレームの送信タイミングを通知する。
図2は、本発明の第1の実施形態の無線通信システムの構成を示す図である。
まず、通常無線基地局10と集中管理型無線基地局30との間で送信タイミングを同期させる動作について説明する。
図6は、集中管理型無線基地局30の起動時に送信タイミングを同期させる動作を示すシーケンス図である。
図7は、通常無線基地局10の起動時に送信タイミングを同期させる動作を示すシーケンス図である。
図8は、通常無線基地局10の起動時に送信タイミングを同期させる他の動作を示すシーケンス図である。
次に、集中管理型無線基地局30へのサブフレームの割り当ての動作について説明する。
図9は、集中管理型無線基地局30の起動時のサブフレームの割り当ての動作を示すシーケンス図である。
図10は、通常無線基地局10の起動時のサブフレームの割り当ての動作を示すシーケンス図である。
図11は、通常無線基地局10の起動時のサブフレームの割り当ての他の動作を示すシーケンス図である。
本実施形態では、第1の実施形態と比較して、図12に示すように、通常無線基地局10と集中管理型無線基地局30とが、S1インタフェースを介してMME73経由で情報を通知する点が異なる。
まず、通常無線基地局10と集中管理型無線基地局30との間で送信タイミングを同期させる動作について説明する。
図13は、集中管理型無線基地局30の起動時に送信タイミングを同期させる動作を示すシーケンス図である。
図14は、通常無線基地局10の起動時に送信タイミングを同期させる動作を示すシーケンス図である。
(C-3)通常無線基地局10の起動時の他の動作
図15は、通常無線基地局10の起動時に送信タイミングを同期させる他の動作を示すシーケンス図である。
次に、集中管理型無線基地局30へのサブフレームの割り当ての動作について説明する。
図16は、集中管理型無線基地局30の起動時のサブフレームの割り当ての動作を示すシーケンス図である。
図17は、通常無線基地局10の起動時のサブフレームの割り当ての動作を示すシーケンス図である。
図18は、通常無線基地局10の起動時のサブフレームの割り当ての他の動作を示すシーケンス図である。
本実施形態では、第1および第2の実施形態と比較して、図19に示すように、通常無線基地局10と集中管理型無線基地局30とが、共通して接続するRF送受信機50経由で情報を通知する点が異なる。
通常無線基地局10と集中管理型無線基地局30との間で送信タイミングを同期させる動作について説明する。
図20は、集中管理型無線基地局30の起動時に送信タイミングを同期させる動作を示すシーケンス図である。
図21は、通常無線基地局10の起動時に送信タイミングを同期させる動作を示すシーケンス図である。
Claims (9)
- 自局のカバーエリアに在圏する第1の端末に対し、データをフレームに載せて所定の周波数帯域内の周波数を用いて送信する複数の第1の無線基地局と、
前記複数の第1の無線基地局のカバーエリアと同じエリアを自局のカバーエリアとし、自局のカバーエリアに在圏する第2の端末に対し、データをフレームに載せて前記所定の周波数帯域内の周波数を用いて送信する第2の無線基地局と、を備え、
前記複数の第1の無線基地局の各々は、自局が前記第1の端末に対して送信するフレームの送信タイミングを前記第2の無線基地局に通知し、
前記第2の無線基地局は、前記第2の端末に対して送信するフレームの送信タイミングを、該第2の端末が在圏するカバーエリアをカバーする前記第1の無線基地局から通知された送信タイミングに同期させる、無線通信システム。 - 請求項1記載の無線通信システムにおいて、
前記複数の第1の無線基地局の各々は、前記第2の無線基地局がフレームにデータを載せる時間帯を決定し、決定した時間帯を前記第2の無線基地局に通知する、無線通信システム。 - 請求項2記載の無線通信システムにおいて、
前記複数の第1の無線基地局の各々と前記第2の無線基地局とはX2インタフェースを介して接続されており、
前記複数の第1の無線基地局の各々は、前記X2インタフェースを介して、自局のフレームの送信タイミングと前記決定した時間帯とを、前記第2の無線基地局に通知する、無線通信システム。 - 請求項2記載の無線通信システムにおいて、
前記複数の第1の無線基地局および前記第2の無線基地局とS1インタフェースを介して接続される上位局を更に備え、
前記複数の第1の無線基地局の各々は、前記上位局経由で、前記S1インタフェースを介して、自局のフレームの送信タイミングと前記決定した時間帯とを、前記第2の無線基地局に通知する、無線通信システム。 - 請求項2記載の無線通信システムにおいて、
前記複数の第1の無線基地局の各々に対応して設けられ、対応する第1の無線基地局と第2の無線基地局とから送信されるデータを増幅する複数のRF送受信機を更に備え、
前記複数の第1の無線基地局の各々は、対応するRF送受信機経由で、自局のフレームの送信タイミングと前記決定した時間帯とを、前記第2の無線基地局に通知する、無線通信システム。 - 請求項2から5のいずれか1項に記載の無線通信システムにおいて、
前記複数の第1の無線基地局の各々は、前記決定した時間帯を自局のカバーエリアに在圏する前記第1および第2の端末に報知する、無線通信システム。 - 請求項1記載の無線通信システムにおいて、
前記複数の第1の無線基地局の各々は、前記第2の無線基地局がフレームの送信に用いる前記所定の周波数帯域内の周波数を決定し、決定した周波数を前記第2の無線基地局に通知する、無線通信システム。 - 自局のカバーエリアに在圏する第1の端末に対し、データをフレームに載せて所定の周波数帯域内の周波数を用いて送信する無線基地局であって、
前記無線基地局のカバーエリアと同じエリアをカバーエリアとし、前記所定の周波数帯域内の周波数を用いて自局のカバーエリアに在圏する第2の端末にデータをフレームに載せて送信する集中管理型無線基地局に対し、自局のフレームの送信タイミングを通知する制御部を有する無線基地局。 - 第1の無線基地局および第2の無線基地局が、同じエリアをカバーエリアとし、同じ周波数帯域内の周波数を用いてそれぞれ第1の端末および第2の端末に対してデータをフレームに載せて送信する場合において、前記第1の無線基地局が前記第2の無線基地局と協調するための協調制御方法であって、
前記第1の無線基地局が、前記第2の無線基地局に自局のフレームの送信タイミングを通知する、協調制御方法。
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JP2011552670A JP5464217B2 (ja) | 2010-02-04 | 2010-12-22 | 無線通信システム、無線基地局、集中管理型無線基地局、端末、および、協調制御方法 |
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CN103019172A (zh) * | 2012-11-06 | 2013-04-03 | 西华大学 | 自组织无线电监测系统及方法 |
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JPWO2011096147A1 (ja) | 2013-06-10 |
CN102754497A (zh) | 2012-10-24 |
US20120294243A1 (en) | 2012-11-22 |
EP2533584A1 (en) | 2012-12-12 |
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