WO2010106836A1 - 無線通信システム、基地局、移動局、無線通信方法 - Google Patents
無線通信システム、基地局、移動局、無線通信方法 Download PDFInfo
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- WO2010106836A1 WO2010106836A1 PCT/JP2010/051213 JP2010051213W WO2010106836A1 WO 2010106836 A1 WO2010106836 A1 WO 2010106836A1 JP 2010051213 W JP2010051213 W JP 2010051213W WO 2010106836 A1 WO2010106836 A1 WO 2010106836A1
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- interference signal
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- 238000004891 communication Methods 0.000 title claims abstract description 185
- 238000000034 method Methods 0.000 title claims description 59
- 230000007480 spreading Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 14
- 230000002093 peripheral effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000004913 activation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a radio communication system, a base station, a mobile station, and a radio communication method.
- a base station in order to enable wireless communication even in places where radio waves are difficult to reach, a base station called a femto base station with a small cell radius of about 10 m is placed in such a place. There is what I did.
- Patent Document 1 discloses a technique of measuring interference of a measurement channel on the system side and allocating a frequency with less interference to the base station.
- Patent Document 2 discloses that a base station receives information on spreading codes used by neighboring base stations from a higher-level station and uses spreading codes used by neighboring base stations.
- a technique for selecting a spreading code other than a code, that is, a spreading code with less interference is disclosed.
- the base station can be notified of the communication parameters (frequency, spreading code) of the peripheral base station and the peripheral base station from the upper station, Interference between base stations can be reduced based on the notified information.
- the base station cannot be notified of the communication parameters of the peripheral base station and the peripheral base station when there is no higher station, and as a result, the interference between the base stations cannot be reduced. become.
- Patent Documents 1 and 2 have been developed by LTE (Long Term Evolution), etc., and the functions of higher stations (control stations) have been reduced to each base station. It cannot be applied to the lost form of wireless communication system.
- a first object of the present invention is to provide a radio communication system, a base station, a mobile station, and a radio communication method that allow a base station to detect neighboring base stations without going through a host station. .
- a second object of the present invention is to provide a radio communication system, a base station, and a base station that can detect communication parameters of a neighboring base station and know communication parameters with less interference without going through an upper station.
- a mobile station and a wireless communication method To provide a mobile station and a wireless communication method.
- the first wireless communication system of the present invention includes: A wireless communication system comprising a mobile station and a plurality of base stations that communicate wireless signals between mobile stations existing in a cell of the local station, Each of the plurality of base stations is In the case where an interference signal is included in a radio signal received from a mobile station in communication, a base station side control unit that detects an IP address of a base station that is a source of the interference signal and is set in the interference signal .
- the second wireless communication system of the present invention is A wireless communication system comprising a mobile station and a plurality of base stations that communicate wireless signals between mobile stations existing in a cell of the local station,
- the mobile station When a radio signal received from a communicating base station includes an interference signal, the IP address of the base station that is the source of the interference signal set in the interference signal is detected, and the detected IP address Mobile station side control means for transmitting information to the communicating base station,
- Each of the plurality of base stations is It has a base station side control means for receiving information on the IP address of the base station that is the source of the interference signal transmitted from the mobile station in communication.
- the first base station of the present invention A base station that communicates radio signals with mobile stations that exist in its own cell, In the case where an interference signal is included in a radio signal received from a mobile station in communication, a base station side control unit that detects an IP address of a base station that is a source of the interference signal and is set in the interference signal .
- the second base station of the present invention A base station that communicates radio signals with mobile stations that exist in its own cell, When the radio signal transmitted to the mobile station in communication includes an interference signal, the base station side control that receives the IP address information of the base station that is the source of the interference signal transmitted from the mobile station in communication Have means.
- the mobile station of the present invention A mobile station that communicates radio signals with a base station, When a radio signal received from a communicating base station includes an interference signal, the IP address of the base station that is the source of the interference signal set in the interference signal is detected, and the detected IP address It has mobile station side control means for transmitting information to the communicating base station.
- the first wireless communication method of the present invention includes: A wireless communication method by a wireless communication system comprising a mobile station and a plurality of base stations that communicate wireless signals between mobile stations existing in the cell of the local station, When each of the plurality of base stations includes an interference signal in a radio signal received from a mobile station in communication, the IP address of the base station that is the source of the interference signal set in the interference signal is set. Detecting.
- the second wireless communication method of the present invention includes: A wireless communication method by a wireless communication system comprising a mobile station and a plurality of base stations that communicate wireless signals between mobile stations existing in the cell of the local station, When the mobile station includes an interference signal in a radio signal received from a communicating base station, the mobile station detects the IP address of the base station that is the source of the interference signal set in the interference signal, Transmitting the detected IP address information to the communicating base station; Each of the plurality of base stations has a step of receiving information on the IP address of the base station that is the source of the interference signal transmitted from the mobile station in communication.
- the third wireless communication method of the present invention is: A radio communication method by a base station that communicates radio signals with a mobile station existing in a cell of the own station, When a radio signal received from a mobile station in communication includes an interference signal, the method includes a step of detecting an IP address of a base station that is a source of the interference signal, which is set in the interference signal.
- the fourth wireless communication method of the present invention is: A radio communication method by a base station that communicates radio signals with a mobile station existing in a cell of the own station, When the interference signal is included in the radio signal transmitted to the mobile station in communication, there is a step of receiving the IP address information of the base station that is the source of the interference signal transmitted from the mobile station in communication.
- the fifth wireless communication method of the present invention provides: A radio communication method by a mobile station for communicating radio signals with a base station, When a radio signal received from a communicating base station includes an interference signal, the IP address of the base station that is the source of the interference signal set in the interference signal is detected, and the detected IP address Transmitting information to the communicating base station.
- each of the plurality of base stations detects the IP address of the femto base station that is the source of the interference signal included in the radio signal received from the mobile station in communication.
- the mobile station detects the IP address of the base station that is the source of the interference signal included in the wireless signal received from the communicating base station, and Notify the station.
- each of the plurality of base stations can detect the base station that is the source of the interference signal, that is, the surrounding base station, without going through the upper station.
- FIG. 3 is a sequence diagram for explaining an operation example when a map is generated in the wireless communication system shown in FIG. 1.
- FIG. 10 is a sequence diagram for explaining another example of operation when a map is generated in the wireless communication system shown in FIG. 1.
- FIG. 10 is a sequence diagram illustrating still another operation example when a map is generated in the wireless communication system illustrated in FIG. 1.
- FIG. 3 is a sequence diagram for explaining an operation example when changing communication parameters of a base station in the wireless communication system shown in FIG. 1.
- FIG. 6 is a sequence diagram illustrating a modified example of the forced handover process illustrated in FIG. 5.
- FIG. 10 is a sequence diagram illustrating another modification of the forced handover process illustrated in FIG. 5.
- the base station is a femto base station
- the present invention is not limited to this.
- the wireless communication system of this embodiment includes N (N is a natural number of 2 or more) femto base stations 10-1 to 10-N and a mobile station 20.
- N is a natural number of 2 or more
- femto base stations 10-1 to 10-N femto base stations 10-1 to 10-N
- mobile station 20 In FIG. 1, only one mobile station 20 is shown for the sake of simplicity of explanation, but the number of mobile stations 20 is not limited to one.
- each of the femto base stations 10-1 to 10-N detects the communication parameters of the peripheral base station and the peripheral base station without going through the upper station.
- this embodiment is a wireless communication system such as W-CDMA (Wideband-Code Division Multiple Access) having a control station (Radio Network Controller) as an upper station of the femto base stations 10-1 to 10-N, and a control station.
- This function can be applied to both radio communication systems such as LTE in which the above function is degenerated to each of the femto base stations 10-1 to 10-N.
- the femto base stations 10-1 to 10-N are connected to a core network (not shown) and communicate with each other via the core network, so that the peripheral base stations and the peripheral base stations Communication parameters will be detected.
- Each of the femto base stations 10-1 to 10-N includes a communication unit 11, a storage unit 12, and a control unit 13.
- the internal configuration of the femto base stations 10-2 to 10-N is omitted.
- the communication unit 11 performs wireless communication with the mobile station 20 and network communication with other femto base stations 10 via the core network.
- the storage unit 12 stores various types of information.
- the control unit 13 controls the communication unit 11 and the storage unit 12 to perform various processes.
- control unit 13 performs the following process.
- a process for measuring the interference amount of an interference signal included in a radio signal in communication with the mobile station 20 via the communication unit 11 A process for detecting the IP address and port number of the femto base station 10 of the interference source Processing for mutually communicating communication parameters (IP address, port number, etc.) of the own station and the peripheral femto base station via the communication unit 11 with the femto base station 10 of the interference source.
- Communication parameters of the peripheral femto base station The cell is reconfigured based on the processing / map generated and stored in the storage unit 12 and the mobile station 20 existing in the old cell before reconfiguration is forcibly handed over to the new cell after reconfiguration.
- the mobile station 20 includes a communication unit 21, a storage unit 22, and a control unit 23.
- the communication unit 21 performs wireless communication with each of the femto base stations 10-1 to 10-N.
- the storage unit 22 stores various types of information.
- the control unit 23 controls the communication unit 21 and the storage unit 22 to perform various processes.
- control unit 23 performs the following process.
- Processing for Notifying Femto Base Station 10 During Communication of IP Address and Port Number of Interference Source Femto Base Station 10 will be described.
- Map generation operation example 1 In this operation example, during the communication between the femto base station 10-1 and the mobile station 20, the femto base station 10-2 detects that the femto base station 10-2 has become an interference source. Each of the femto base stations 10-1 and 10-2 is an example of recording information on the map of the own station.
- step A1 the control unit 13 of the femto base station 10-1 determines whether an uplink radio signal received from the mobile station 20 in the own cell includes an interference signal. .
- control unit 13 of the femto base station 10-1 performs SIR (Signal to Interference power Ratio), BLER (BLock Error Rate), Ec / NO (Received energy per chip divided by the power density in the band), RTWP ( Based on the received total wideband power, cell update count, call loss count, packet retransmission count, etc., it is determined whether or not an interference signal is included in the radio signal.
- SIR Signal to Interference power Ratio
- BLER BLock Error Rate
- Ec / NO Receiveived energy per chip divided by the power density in the band
- RTWP Based on the received total wideband power, cell update count, call loss count, packet retransmission count, etc., it is determined whether or not an interference signal is included in the radio signal.
- the SIR is A method of determining that an interference signal is included can be considered as long as it is below a predetermined threshold, but the present invention is not limited to this.
- the control unit 13 of the femto base station 10-1 detects the source IP address and port number set in the interference signal in step A2.
- the detected IP address and port number are those of the femto base station 10-2.
- control unit 13 of the femto base station 10-1 transmits to the femto base station 10-2 the femto base station 10-2 and the femto base station previously detected by the own station among other femto base stations recorded in the map.
- a message including information on communication parameters IP address, port number, frequency, spreading code (scrambling code, channelization code)) is transmitted.
- the control unit 13 of the femto base station 10-2 detects the IP address and port number of the transmission source set in the message in step A3.
- the detected IP address and port number are those of the femto base station 10-1.
- control unit 13 of the femto base station 10-2 provides the femto base station 10-1 with the own station and the femto base station previously detected by the own station among other femto base stations recorded in the map.
- a message including information on communication parameters (IP address, port number, frequency, spreading code) is transmitted.
- each control unit 13 of the femto base stations 10-1 and 10-2 receives the communication parameters (IP address, port number, frequency, etc.) of the other femto base stations received in steps A3 and A2 in steps A4 and A5, respectively.
- (Spread code) information is recorded in a map in the storage unit 12.
- An example of a map in the femto base station 10-1 is shown in Table 1. In Table 1, the flag indicates a femto base station detected by the own station before.
- each map of the femto base stations 10-1 and 10-2 includes the femto base station (adjacent base station) detected by the own station and the femto base detected by the femto base station.
- a communication parameter with a station can be recorded as a communication parameter of a neighboring base station.
- Map generation operation example 2 In this operation example, during the communication between the femto base station 10-1 and the mobile station 20, the femto base station 10-2 detects that the femto base station 10-2 has become an interference source. Each of the femto base stations 10-1 and 10-2 is another example of recording information on the map of the own station.
- step B1 the control unit 13 of the femto base station 10-1 determines whether an uplink radio signal received from the mobile station 20 in the own cell includes an interference signal. .
- control unit 13 of the femto base station 10-1 includes an interference signal in the radio signal based on SIR, BLER, Ec / NO, RTWP, cell update count, call loss count, packet retransmission count, and the like. Determine whether or not.
- the control unit 13 of the femto base station 10-1 detects the source IP address and port number set in the interference signal in Step B2.
- the detected IP address and port number are those of the femto base station 10-2.
- control unit 13 of the femto base station 10-1 transmits a message including information on its own communication parameters (IP address, port number, position, frequency, spreading code) to the femto base station 10-2. .
- the location information is assumed to be latitude and longitude information obtained using GPS (Global Positioning System). If radio waves from GPS satellites cannot be received, the IP address, Adjacent cell information, cell ID, etc. may be used.
- GPS Global Positioning System
- the control unit 13 of the femto base station 10-2 detects the source IP address and port number set in the message in step B3.
- the detected IP address and port number are those of the femto base station 10-1.
- the control unit 13 of the femto base station 10-2 determines whether the femto base station 10-1 has fixed the femto base station 10-1 based on the position information of the femto base station 10-1 and the position information of other femto base stations recorded in the map. Identify other femto base stations present in range. Further, the control unit 13 of the femto base station 10-2 transmits the communication parameters (IP address, port number, position, etc.) between itself and the other femto base stations specified above to the femto base station 10-1. A message including frequency and spreading code information is transmitted. At this time, if the own station does not exist within a certain range from the femto base station 10-1, the control unit 13 of the femto base station 10-2 does not have to transmit the communication parameter information of the own station.
- step B4 the control unit 13 of the femto base station 10-1 first starts the femto base station 10-2 based on the position information of the femto base station 10-2 and the position information of other femto base stations recorded in the map. Other femto base stations existing within a certain range from the base station 10-2 are specified. Then, the control unit 13 of the femto base station 10-1 transmits the communication parameters (IP address, port number, position, frequency, spreading code) of the other femto base station specified above to the femto base station 10-2. Send a message with information.
- IP address IP address, port number, position, frequency, spreading code
- An example of a map in the femto base station 10-1 is shown in Table 2.
- each map of the femto base stations 10-1 and 10-2 includes the communication parameters of other femto base stations existing within a certain range from the own station, and the communication of neighboring base stations. It can be recorded as a parameter.
- Map generation operation example 3 In this operation example, during the communication between the femto base station 10-1 and the mobile station 20, the mobile station 20 detects that the femto base station 10-2 has become an interference source, and the femto base station is triggered by this detection.
- Each of 10-1 and 10-2 is an example of recording information on the map of the own station.
- step C3 the control unit 23 of the mobile station 20 determines whether or not an interference signal is included in the downlink radio signal received from the femto base station 10-1.
- control unit 23 of the mobile station 20 receives CPICH (Common Pilot Channel) reception quality, DPCH (Dedicated Physical Channel) reception quality, P-CCPCH (Primary Common Control Channel, FATCH (Forward Access Channel) DTCH (Forward Access Channel). (Dedicated Traffic Channels), etc.)) to determine whether the radio signal contains an interference signal.
- CPICH Common Pilot Channel
- DPCH Dedicated Physical Channel
- P-CCPCH Primary Common Control Channel
- FATCH Forward Access Channel
- DTCH Forward Access Channel
- DTCH Forward Access Channel
- the BLER value is an interference amount
- the BLER is a predetermined threshold value. If it is above, the method of determining that the interference signal is included, or if the SIR value of CPICH is the amount of interference, and if the SIR is equal to or less than a predetermined threshold, it is determined that the interference signal is included.
- a method can be considered, this invention is not limited to these.
- the control unit 23 of the mobile station 20 detects the source IP address and port number set in the interference signal in step C4 (or C5, C6). .
- the detected IP address and port number are those of the femto base station 10-2.
- the IP addresses and port numbers of the femto base stations 10-1 and 10-2 are obtained from those set in the radio signal received via the BCH (Broadcast Channel) in each of steps C1 and C2. .
- control unit 23 of the mobile station 20 notifies the femto base station 10-1 of the IP address and port number of the femto base station 10-2.
- step C4 the control unit 23 retransmits the RRC (Radio Resource Control) connection that is transmitted to the femto base station 10-1 via the RACH (Random Access Channel).
- RRC Radio Resource Control
- the above notification is made with an RRC Connection Request message requesting connection.
- the control unit 23 of the mobile station 20 reports measurement values obtained by performing various communication measurements at the mobile station 20 to be transmitted to the femto base station 10-1 via the FACH in Step C5.
- the above notification is made with a Measurement Report message.
- the mobile station 20 performs the above notification using a Cell Update message requesting reconnection of the RRC connection, which is transmitted to the femto base station 10-1 via the RACH.
- step C5 the control unit 23 performs the above notification using a Measurement Report message transmitted to the femto base station 10-1 via the DCH.
- the mobile station 20 may perform the above notification using another message transmitted to the femto base station 10-1 without being limited to the above message.
- the operation performed between the femto base stations 10-1 and 10-2 is substantially the same as the operation after step A2 in FIG. 2 or after step B2 in FIG.
- the communication parameter of the femto base station 10 previously notified from the mobile station 20 is not the communication parameter of the femto base station 10 previously detected by the own station. Will be notified.
- each map of the femto base stations 10-1 and 10-2 is displayed.
- communication parameters of neighboring base stations can be recorded.
- each control unit 13 of femto base stations 10-1 and 10-2 encrypts communication parameters between femto base stations 10-1 and 10-2. It is good also as encrypting by a system and notifying each other and decoding and acquiring the communication parameter notified from the other party.
- each control unit 13 of the femto base stations 10-1 and 10-2 receives information on the IP address and port number of the own station set in the radio signal as the femto base station 10-1, 10-2, the control unit 23 of the mobile station 20 transfers the encrypted IP address and port number information of the interference signal source to the femto base station 10-1. Then, the control unit 13 of the femto base station 10-1 may decode and acquire the IP address information transmitted from the mobile station 20.
- Each of the femto base stations 10-1 to 10-N has an interference amount of an interference signal included in a radio signal in communication with the mobile station 20 equal to or greater than a predetermined threshold value.
- the communication parameter is changed based on the map generated above when the time allocated in advance is reached, or when the time determined by negotiation (negotiation) with the adjacent base station is reached.
- control unit 13 of the femto base station 10-1 periodically measures the interference amount of the interference signal included in the uplink radio signal received from the mobile station 20 in step D1.
- control unit 13 of the femto base station 10-1 measures the amount of interference based on SIR, BLER, Ec / NO, RTWP, cell update count, call loss count, packet retransmission count, and the like.
- a method of measuring the SIR value as the interference amount can be considered, but the present invention is not limited to this. .
- This measurement is not limited to the uplink radio signal performed by the femto base station 10-1, but a single or multiple mobile stations 20 may perform the downlink radio signal, and the measurement result may be transmitted to the femto base station 10-1.
- the station 10-1 may be reported.
- the selection method of the single or plural mobile stations 20 may be an arbitrary method such as a selection method based on a specific IMSI (International Mobile Subscriber Identity). Further, the femto base station 10-1 may select all the mobile stations 20 in the own cell.
- IMSI International Mobile Subscriber Identity
- control unit 23 of the mobile station 20 measures the amount of interference based on the CPICH reception quality, the DPCH reception quality, the P-CCPCH reception quality, and the like.
- a method of measuring the interference amount in the control unit 23 of the mobile station 20 for example, a method of measuring a BLER value or a CPICH SIR value as the interference amount can be considered. It is not limited to.
- step D3 the control unit 13 newly generates a cell with changed communication parameters based on the map. Then, a forced handover (HO: Handover) process is performed in which the mobile station 20 that has been in the connected mode in the old cell (has established an RRC connection with the own station) is forcibly handed over to the new cell.
- HO Handover
- the threshold value of the interference amount that triggers the change of the communication parameter used in step D2 is equal to or greater than the threshold value of the interference amount used in step A1 of FIG. 2 to determine that the radio signal includes an interference signal.
- the following method can be considered.
- A Among other femto base stations recorded in the map, another target femto base station is specified.
- the target is all other femto base stations already recorded in the map, or when latitude / longitude is recorded as position information (Table 2), other objects exist within a certain range from the own station. Or, if the IP address is recorded as position information, the other femto base station having the same subnet mask.
- B If there is a frequency that is not used by any of the other target femto base stations, the frequency is changed to that frequency.
- the frequency is changed to a spreading code that is not used by any of the target femto base stations.
- D When there is no frequency or spreading code that is not used by any of the other femto base stations of interest, the frequency is changed to a frequency with less interference among the frequencies used by any of the other femto base stations. Or, it is changed to a spreading code with less interference among spreading codes used in any of the other femto base stations.
- the method for changing the communication parameters is not limited to the above method.
- step D3 the forced handover process in step D3 will be described in detail.
- control unit 13 of the femto base station 10-1 first instructs an RRC disconnection instruction to instruct all mobile stations 20 in the connected mode in the old cell to disconnect the RRC connection in step E1.
- Send a message for example, RRC Connection Release message.
- control unit 13 of the femto base station 10-1 notifies the following communication parameters necessary for connection with the new cell in the RRC disconnection instruction message.
- control unit 13 of the femto base station 10-1 may notify the following communication parameters.
- MIMO Multiple Input Multiple Output
- HSPA High Speed Packet Access
- the control unit 13 of the femto base station 10-1 may notify the following communication parameters.
- ⁇ RNTI Radio Network Temporary Identity
- Ciphering information MBMS Multimedia Broadcast Multicast Service
- MICH MBMS Indicator Channel
- MCCH MBMS Control Channel
- MTCH MBMS Traffic Channel
- SAI Service Area Identification
- Steps E3 and E4 the control unit 13 of the femto base station 10-1 deletes the old cell and generates a new cell in which communication parameters are changed from the old cell, thereby reconfiguring the cell.
- control unit 23 of the mobile station 20 detects a new cell in step E5, it establishes an RRC connection in the new cell using the communication parameter notified in the RRC disconnection instruction message after the activation time has elapsed in step E6. Then, the wireless communication with the femto base station 10-1 is resumed via the new cell.
- step D3 user authentication can be optionally performed.
- User authentication can be used to prevent the mobile station 20 from hijacking traffic. Processing in this case will be described with reference to FIG. In FIG. 6, the same parts as those in FIG.
- control unit 13 of the femto base station 10-1 transmits all the RRC disconnection instruction messages to all the mobile stations 20 in the connected mode in the old cell in step E1. Issue a certificate to the mobile station 20 of At this time, there is no need to notify the activation time.
- control unit 23 of the mobile station 20 When the control unit 23 of the mobile station 20 receives the certificate from the femto base station 10-1, after detecting a new cell in step E5, the control unit 23 includes the certificate for the femto base station 10-1 in step E7. Then, a reconnection request message requesting reconnection of the RRC connection (for example, RRC Connection Request message, Cell Update message, etc.) is transmitted.
- RRC Connection Request message for example, RRC Connection Request message, Cell Update message, etc.
- Step E9 a reconnection instruction message (for example, RRC Connection Setup message, Cell Update Confirm message, etc.) for instructing reconnection of the RRC connection is transmitted to the mobile station 20.
- the communication parameter is also notified by the reconnection instruction message, but the communication parameter already notified by the RRC disconnection request message can be omitted.
- the control unit 23 of the mobile station 20 When receiving the reconnection instruction message from the femto base station 10-1, the control unit 23 of the mobile station 20 notifies the femto base station 10-1 of the completion of reconnection of the RRC connection in step E10.
- a notification message (for example, RRC Connection Setup Complete message, RB Setup Complete message, Transport Channel Reconfiguration Complete message, etc.) is transmitted, and in step E6, wireless communication with the femto base station 10-1 is resumed via the new cell.
- step E1 if the control unit 13 of the femto base station 10-1 has the mobile station 20 notify the IMSI or TMSI (Temporary Mobile Subscriber Identity), the certificate is issued in step E1. It is also possible to omit the processing.
- IMSI Temporal Mobile Subscriber Identity
- SI System Information
- the control unit 13 of the femto base station 10-1 includes the new cell frequency, MICH, S-CCPCH (Secondary Common Control Physical Channel), FACH, PCH (Paging) included in the SI. Channel), MCCH, MTCH, scrambling code (PCI (Physical Cell ID in the case of LTE)) and the like are updated, and the updated SI is distributed to the mobile station 20 in step E12.
- a plurality of candidate frequencies can be included in the SI as the frequency of the new cell. Also, priorities can be assigned to each of a plurality of candidate frequencies.
- the frequency included in the SI may be only the frequency of the new cell.
- step E13 the control unit 13 of the femto base station 10-1 notifies the mobile station 20 in the Cell_FACH state or the Cell_PCH state that the SI has been changed among the mobile stations 20 other than the connected mode.
- Send System Information Change Indication message
- each of the femto base stations 10-1 to 10-N receives the IP address of the femto base station that is the source of the interference signal included in the radio signal received from the mobile station 20 in communication. Is detected.
- the mobile station 20 detects the IP address of the femto base station 10 that is the source of the interference signal included in the radio signal received from the communicating femto base station 10, and notifies the communicating femto base station 10.
- each of the femto base stations 10-1 to 10-N can detect the femto base station 10 that is the source of the interference signal, that is, the femto base stations 10 in the vicinity, without using an upper station. An effect is obtained.
- each of the femto base stations 10-1 to 10-N communicates with the base station that is the source of the interference signal based on the IP address of the femto base station 10 that is the source of the interference signal. Then, the communication parameters of the own station and the surrounding femto base stations are notified to each other.
- each of the femto base stations 10-1 to 10-N can detect the communication parameters of the nearby femto base station 10 without using an upper station, and as a result, communication parameters with less interference can be obtained. The effect of being able to know is obtained.
- the new cell after reconfiguration is transmitted to the mobile station 20 existing in the old cell before reconfiguration. Notify the communication parameters.
- the mobile station 20 can smoothly start communication with the new cell.
- the method performed by the femto base stations 10-1 to 10-N and the mobile station 20 of the present invention may be applied to a program for causing a computer to execute.
- the program can be stored in a storage medium and can be provided to the outside via a network.
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Abstract
Description
移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムであって、
前記複数の基地局の各々は、
通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出する基地局側制御手段を有する。
移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムであって、
前記移動局は、
通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信する移動局側制御手段を有し、
前記複数の基地局の各々は、
通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信する基地局側制御手段を有する。
自局のセルに存在する移動局との間で無線信号を通信する基地局であって、
通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出する基地局側制御手段を有する。
自局のセルに存在する移動局との間で無線信号を通信する基地局であって、
通信中の移動局に送信した無線信号に干渉信号が含まれる場合に、通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信する基地局側制御手段を有する。
基地局との間で無線信号を通信する移動局であって、
通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信する移動局側制御手段を有する。
移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムによる無線通信方法であって、
前記複数の基地局の各々が、通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出するステップを有する。
移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムによる無線通信方法であって、
前記移動局が、通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信するステップと、
前記複数の基地局の各々が、通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信するステップと、を有する。
自局のセルに存在する移動局との間で無線信号を通信する基地局による無線通信方法であって、
通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出するステップを有する。
自局のセルに存在する移動局との間で無線信号を通信する基地局による無線通信方法であって、
通信中の移動局に送信した無線信号に干渉信号が含まれる場合に、通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信するステップを有する。
基地局との間で無線信号を通信する移動局による無線通信方法であって、
通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信するステップを有する。
・移動局20との間で通信部11を介して通信中の無線信号に含まれる干渉信号の干渉量を測定する処理
・干渉源のフェムト基地局10のIPアドレスおよびポート番号を検出する処理
・干渉源のフェムト基地局10との間で、通信部11を介して自局や周辺フェムト基地局の通信パラメータ(IPアドレス、ポート番号等)を互いに通知する処理
・周辺フェムト基地局の通信パラメータを記録したマップを生成し記憶部12に記憶させる処理
・マップを基にセルを再構成し、再構成前の旧セルに存在する移動局20を、再構成後の新セルに強制的にハンドオーバーさせる処理
また、移動局20は、通信部21と、記憶部22と、制御部23と、を有している。
・フェムト基地局10との間で通信部21を介して通信中の無線信号に含まれる干渉信号の干渉量を測定する処理
・干渉源のフェムト基地局10のIPアドレスおよびポート番号を検出する処理
・通信中のフェムト基地局10に、干渉源のフェムト基地局10のIPアドレスおよびポート番号を通知する処理
以下、本実施形態の無線通信システムの動作について説明する。
フェムト基地局10-1~10-Nの各々は、周辺フェムト基地局の通信パラメータを記録したマップを生成する。ここでは、マップを生成する3つの動作例について説明する。
本動作例は、フェムト基地局10-1と移動局20との通信中に、フェムト基地局10-2が干渉源となったことをフェムト基地局10-1にて検出し、これを契機としてフェムト基地局10-1,10-2の各々が、自局のマップに情報を記録する一例となる。
本動作例は、フェムト基地局10-1と移動局20との通信中に、フェムト基地局10-2が干渉源となったことをフェムト基地局10-1にて検出し、これを契機としてフェムト基地局10-1,10-2の各々が、自局のマップに情報を記録する他の例となる。
本動作例は、フェムト基地局10-1と移動局20との通信中に、フェムト基地局10-2が干渉源となったことを移動局20にて検出し、これを契機としてフェムト基地局10-1,10-2の各々が、自局のマップに情報を記録する一例となる。
フェムト基地局10-1~10-Nの各々は、移動局20との間で通信中の無線信号に含まれる干渉信号の干渉量が所定の閾値以上になった場合、予め割り当てられた時間になった場合、隣接基地局との間の交渉(ネゴシエーション)により決定された時間になった場合、上記で生成したマップに基づいて通信パラメータを変更する。
(a)マップに記録済みの他のフェムト基地局の中で、対象とする他のフェムト基地局を特定する。例えば、対象は、マップに記録済みの他のフェムト基地局の全てとするか、位置情報として緯度・経度が記録されている場合は(表2)、自局から一定の範囲内に存在する他のフェムト基地局とするか、または、位置情報としてIPアドレスが記録されている場合は、サブネットマスクが同一である他のフェムト基地局とする。
(b)対象の他のフェムト基地局のいずれにも使用されていない周波数がある場合、その周波数に変更する。
(c)対象の他のフェムト基地局のいずれにも使用されていない周波数が無い場合、対象のフェムト基地局のいずれにも使用されていない拡散符号に変更する。
(d)対象の他のフェムト基地局のいずれにも使用されていない周波数や拡散符号が無い場合、他のフェムト基地局のいずれかに使用されている周波数の中で干渉が少ない周波数に変更するか、または、他のフェムト基地局のいずれかに使用されている拡散符号の中で干渉が少ない拡散符号に変更する。
・新セルのチャネルタイプ
・新セルのサービス情報(MIMO(Multiple Input Multiple Output)、HSPA(High Speed Packet Access)等)
・新セルのダウンリンクレート/アップリンクレート
・新セルのスクランブリングコード(Scrambling Code)
・新セルのチャネライゼーションコード(Channelisation Code)
その他にも、フェムト基地局10-1の制御部13は、以下のような通信パラメータを通知してもよい。
・Cipheringの情報
・MBMS(Multimedia Broadcast Multicast Service)の情報。例えば、MBMS用のMICH(MBMS Indicator Channel)、MCCH(MBMS Control Channel)、MTCH(MBMS Traffic Channel)に関連する情報(拡散符号の情報やSAI(Service Area Identification)の情報等)や、MBMS用のデータ送信を再開するまでのActivation Time等の時間情報
移動局20の制御部23は、フェムト基地局10-1からRRC切断指示メッセージを受信すると、ステップE2において、RRCコネクションを切断する。これにより、移動局20とフェムト基地局10-1間の無線通信が停止する。
Claims (35)
- 移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムであって、
前記複数の基地局の各々は、
通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出する基地局側制御手段を有する、無線通信システム。 - 前記基地局側制御手段は、
前記検出したIPアドレスを基に、干渉信号の発信元の基地局との間で、自局の通信パラメータを互いに通知する、請求項1に記載の無線通信システム。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局との間で、以前に自局でIPアドレスを検出した基地局の通信パラメータも互いに通知する、請求項2に記載の無線通信システム。 - 移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムであって、
前記移動局は、
通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信する移動局側制御手段を有し、
前記複数の基地局の各々は、
通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信する基地局側制御手段を有する、無線通信システム。 - 前記基地局側制御手段は、
前記検出したIPアドレスを基に、干渉信号の発信元の基地局との間で、自局の通信パラメータを互いに通知する、請求項4に記載の無線通信システム。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局との間で、以前に移動局からIPアドレスの情報を受信した基地局の通信パラメータも互いに通知する、請求項5に記載の無線通信システム。 - 前記基地局側制御手段は、
無線信号に設定する自局のIPアドレスを暗号化し、
前記移動局側制御手段は、
干渉信号の発信元の基地局の暗号化されたIPアドレスの情報を通信中の基地局に転送し、
前記基地局側制御手段は、
通信中の移動局から送信されてきた、干渉信号の発信元の基地局の暗号化されたIPアドレスの情報を受信し、該IPアドレスの情報を復号して取得する、請求項4から6のいずれか1項に記載の無線通信システム。 - 前記基地局側制御手段は、
通信パラメータを暗号化して互いに通知し、
通知された通信パラメータを復号して取得する、請求項1から7のいずれか1項に記載の無線通信システム。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局との間で互いに通知する通信パラメータに位置情報を含めることとし、
干渉信号の発信元の基地局との間で、当該基地局から一定範囲内に存在する基地局の通信パラメータも互いに通知する、請求項2または5に記載の無線通信システム。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局から通知された通信パラメータを表すマップを生成する、請求項3,6または9に記載の無線通信システム。 - 前記基地局側制御手段は、
所定のタイミングで、前記マップに基づいて、自局の通信パラメータを変更してセルを再構成する、請求項10に記載の無線通信システム。 - 前記基地局側制御手段は、
セルを再構成する場合、再構成前の旧セルに存在する移動局に対し、再構成後の新セルの通信パラメータを通知する、請求項11に記載の無線通信システム。 - 前記基地局側制御手段は、
前記移動局に対し、再構成後の新セルの通信パラメータとして、候補周波数を複数通知するとともに、該複数の候補周波数の各々の優先順位を通知する、請求項12に記載の無線通信システム。 - 前記基地局側制御手段は、
前記移動局に対し、再構成後の新セルの通信パラメータとして、MBMSの情報を通知する、請求項12または13に記載の無線通信システム。 - 自局のセルに存在する移動局との間で無線信号を通信する基地局であって、
通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出する基地局側制御手段を有する、基地局。 - 前記基地局側制御手段は、
前記検出したIPアドレスを基に、干渉信号の発信元の基地局との間で、自局の通信パラメータを互いに通知する、請求項15に記載の基地局。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局との間で、以前に自局でIPアドレスを検出した基地局の通信パラメータも互いに通知する、請求項16に記載の基地局。 - 自局のセルに存在する移動局との間で無線信号を通信する基地局であって、
通信中の移動局に送信した無線信号に干渉信号が含まれる場合に、通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信する基地局側制御手段を有する、基地局。 - 前記基地局側制御手段は、
前記検出したIPアドレスを基に、干渉信号の発信元の基地局との間で、自局の通信パラメータを互いに通知する、請求項18に記載の基地局。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局との間で、以前に移動局からIPアドレスの情報を受信した基地局の通信パラメータも互いに通知する、請求項19に記載の基地局。 - 前記基地局側制御手段は、
通信中の移動局から送信されてきた、干渉信号の発信元の基地局の暗号化されたIPアドレスの情報を受信し、該IPアドレスの情報を復号して取得する、請求項18から20のいずれか1項に記載の基地局。 - 前記基地局側制御手段は、
通信パラメータを暗号化して互いに通知し、
通知された通信パラメータを復号して取得する、請求項15から21のいずれか1項に記載の基地局。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局との間で互いに通知する通信パラメータに位置情報を含めることとし、
干渉信号の発信元の基地局との間で、当該基地局から一定範囲内に存在する基地局の通信パラメータも互いに通知する、請求項16または19に記載の基地局。 - 前記基地局側制御手段は、
干渉信号の発信元の基地局から通知された通信パラメータを表すマップを生成する、請求項17,20または23に記載の基地局。 - 前記基地局側制御手段は、
所定のタイミングで、前記マップに基づいて、自局の通信パラメータを変更してセルを再構成する、請求項24に記載の基地局。 - 前記基地局側制御手段は、
セルを再構成する場合、再構成前の旧セルに存在する移動局に対し、再構成後の新セルの通信パラメータを通知する、請求項25に記載の基地局。 - 前記基地局側制御手段は、
前記移動局に対し、再構成後の新セルの通信パラメータとして、候補周波数を複数通知するとともに、該複数の候補周波数の各々の優先順位を通知する、請求項26に記載の基地局。 - 前記基地局側制御手段は、
前記移動局に対し、再構成後の新セルの通信パラメータとして、MBMSの情報を通知する、請求項26または27に記載の基地局。 - 基地局との間で無線信号を通信する移動局であって、
通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信する移動局側制御手段を有する、移動局。 - 前記移動局側制御手段は、
干渉信号の発信元の基地局の暗号化されたIPアドレスの情報を通信中の基地局に転送する、請求項29に記載の移動局。 - 移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムによる無線通信方法であって、
前記複数の基地局の各々が、通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出するステップを有する無線通信方法。 - 移動局と、自局のセルに存在する移動局との間で無線信号を通信する複数の基地局と、を有してなる無線通信システムによる無線通信方法であって、
前記移動局が、通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信するステップと、
前記複数の基地局の各々が、通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信するステップと、を有する無線通信方法。 - 自局のセルに存在する移動局との間で無線信号を通信する基地局による無線通信方法であって、
通信中の移動局から受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出するステップを有する無線通信方法。 - 自局のセルに存在する移動局との間で無線信号を通信する基地局による無線通信方法であって、
通信中の移動局に送信した無線信号に干渉信号が含まれる場合に、通信中の移動局から送信されてきた、干渉信号の発信元の基地局のIPアドレスの情報を受信するステップを有する無線通信方法。 - 基地局との間で無線信号を通信する移動局による無線通信方法であって、
通信中の基地局からから受信した無線信号に干渉信号が含まれる場合に、該干渉信号に設定されている、該干渉信号の発信元の基地局のIPアドレスを検出し、検出したIPアドレスの情報を通信中の基地局に送信するステップを有する無線通信方法。
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JP2011504770A JP5152403B2 (ja) | 2009-03-16 | 2010-01-29 | 無線通信システム、基地局、移動局、無線通信方法 |
CN2010800125223A CN102356654A (zh) | 2009-03-16 | 2010-01-29 | 无线电通信系统、基站、移动台、无线电通信方法 |
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