WO2011096332A1 - 基地局、移動通信システムおよび報知情報送信方法 - Google Patents
基地局、移動通信システムおよび報知情報送信方法 Download PDFInfo
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- WO2011096332A1 WO2011096332A1 PCT/JP2011/051708 JP2011051708W WO2011096332A1 WO 2011096332 A1 WO2011096332 A1 WO 2011096332A1 JP 2011051708 W JP2011051708 W JP 2011051708W WO 2011096332 A1 WO2011096332 A1 WO 2011096332A1
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- 238000000034 method Methods 0.000 title claims description 20
- 238000010295 mobile communication Methods 0.000 title claims description 20
- 238000004891 communication Methods 0.000 claims abstract description 99
- 230000010365 information processing Effects 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000023402 cell communication Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/40—Connection management for selective distribution or broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0007—Control or signalling for completing the hand-off for multicast or broadcast services, e.g. MBMS
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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
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
- H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/90—Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
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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 an information communication system that broadcasts information to mobile terminals simultaneously, and in particular, emergency information such as ETWS (Earthquake and Tsunami), which is one of the systems provided in LTE (Long Term Evolution) which is a radio access specification.
- Warning System relates to a mobile communication system that broadcasts information to mobile terminals all at once.
- the base station in the cell where the own station is managed informing simultaneously the latest ETWS information.
- a mobile terminal residing in a cell can acquire the latest ETWS information that has been urgently notified upon simultaneous paging from the base station (see Non-Patent Documents 1-4).
- one cell is specified as a cell corresponding to the current location of the mobile terminal, and the mobile terminal calls the paging from the base station that manages the specified cell.
- ETWS information can be acquired by responding to.
- LTE / 3GPP TS36.300 v8.9.0 2009-06 Technical Specification Group Radio Access Network, Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall 2 description 8) LTE / 3GPP (TS36.331) v8.6.0 (2009-06), Technical Specification (Group) Radio Access (Network), Evolved (Universal) Terrestrial (Radio Access) (E-UTRA), Radio Resource Control (RRC), Protocol (specification) (Release 8) LTE / 3GPP TS36.423 v8.6.0 2009-06, Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); X2 application protocol (X2AP) (Release 8) LTE / 3GPP TS36.413 v8.6.1 2009-06, Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); S1 Application protocol (S
- the mobile terminal When different ETWS information is broadcast between adjacent cells, and the mobile terminal is located in an area adjacent to other cells in the cell, the mobile terminal It is desirable to acquire the ETWS information broadcast in
- one cell is specified as a cell corresponding to the current location of the mobile terminal, and the mobile terminal can call only from the base station that manages the specified cell ( Paging). For this reason, when the mobile terminal is located in an area adjacent to another cell in the cell, the mobile terminal can acquire only ETWS information broadcasted in one cell specified on the network side, and the other cell It is not possible to acquire ETWS information that has been broadcast within.
- An object of the present invention is to solve the above-described problem, and when a mobile terminal is located in an area adjacent to another cell in the cell, the mobile terminal is notified in each of the cell in which the mobile terminal is located and the adjacent cell. It is to provide a base station, a mobile communication system, and a broadcast information transmission method that can acquire information (for example, ETWS information).
- a base station of the present invention has a cell that defines a range in which radio communication with a mobile terminal is possible, and the cell is arranged adjacent to another cell of another base station.
- a communication unit that performs mutual communication with the other base station, and a broadcast information processing unit that broadcasts broadcast information to mobile terminals in communication within the cell.
- the broadcast information processing unit receives information indicating that the mobile terminal is located in an adjacent area of the cell adjacent to the other cell
- the other information processing unit receives the other via the communication unit.
- the other broadcast information currently broadcast in the other cell is acquired from the other base station, and the acquired other broadcast information is transmitted to the mobile terminal in communication.
- the mobile communication system of the present invention includes a mobile terminal and a plurality of base stations having cells that define a range in which the mobile terminal can perform wireless communication, and the cells of each base station are arranged adjacent to each other.
- a communication system wherein each of the base stations communicates with a communication unit that performs mutual communication with another base station disposed adjacent to the base station, and a mobile terminal that is communicating in the cell of the base station.
- a notification information processing unit that notifies the notification information all at once.
- the broadcast information processing unit When the broadcast information processing unit receives from the mobile terminal in communication information indicating that the mobile terminal is located in an adjacent area adjacent to another cell of the other base station of the cell of the local station, Other broadcast information currently broadcast in the other cell is acquired from the other base station via the communication unit, and the acquired other broadcast information is transmitted to the mobile terminal in communication.
- the broadcast information transmission method of the present invention includes a cell that defines a range in which wireless communication with a mobile terminal is possible, and the cell is located in a base station that is arranged adjacent to another cell of another base station.
- broadcast information for a local station is transmitted to a mobile terminal in communication in the cell, and the mobile terminal transmits the mobile terminal to the other cell in the cell.
- FIG. 1 is a block diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.
- the mobile communication system includes mobile terminals 20 and base stations 10 and 11 having cells that define a range where radio communication with mobile terminals 20 is possible.
- the number of mobile terminals 20 is not limited to one and may be plural.
- the number of base stations is not limited to two, and may be three or more.
- the cell 10 a of the base station 10 is adjacent to the cell 11 a of the base station 11.
- the base stations 10 and 11 can communicate with each other.
- the base stations 10 and 11 are connected by a dedicated communication line, for example, and information can be transmitted and received between the base stations 10 and 11.
- the base stations 10 and 11 have the same configuration.
- FIG. 2 shows the configuration of the base station 10.
- the base station 10 illustrated in FIG. 2 includes a notification information processing unit 40, a wireless communication unit 60, and a communication unit 70.
- the communication unit 70 performs mutual communication with other base stations (the base station 11 in the configuration shown in FIG. 1).
- the radio communication unit 60 performs radio communication with the mobile terminal 20 located in the cell managed by the base station 10. Through this wireless communication, simultaneous calling (paging) can be performed on the mobile terminal 20 in the cell 10a.
- the notification information processing unit 40 includes an adjacent cell notification information acquisition unit 41, a notification information acquisition request response processing unit 42, a notification information generation unit 43, a storage unit 44, and an adjacent cell determination unit 45.
- the neighboring cell determination unit 45 receives information indicating the communication quality of the neighboring cell and a signal including neighboring cell information from the mobile terminal 20 through the wireless communication unit 60.
- the communication quality of the adjacent cell is, for example, the result of the mobile terminal 20 measuring the reception level (reception power) of the signal (radio wave) from the base station that manages the adjacent cell.
- the neighboring cell information is information that can identify the neighboring cell, for example, identification information of a base station that manages the neighboring cell. Such information can be acquired by, for example, “Measurement Report” of RRC (Radio Resource Control).
- the neighboring cell determination unit 45 determines whether or not the communication quality is equal to or higher than the threshold value.
- the determination result is supplied from the adjacent cell determination unit 45 to the adjacent cell broadcast information acquisition unit 41 together with the adjacent cell information acquired from the mobile terminal 20.
- the threshold value is a value that can specify that the mobile terminal 20 is located in the overlapping area 30 (or in the vicinity of the overlapping area 30) of the cells 10a and 11a.
- the broadcast information acquisition request includes identification information of the local station, identification information of broadcast information broadcast in the cell of the local station, and neighboring cell information acquired from the mobile terminal 20.
- the broadcast information is, for example, ETWS information.
- reporting information acquisition part 41 does not transmit alerting
- the adjacent cell broadcast information acquisition unit 41 when the adjacent cell broadcast information acquisition unit 41 receives a broadcast acquisition response from the base station that has received the broadcast information acquisition request via the communication unit 70, the adjacent cell broadcast information acquisition unit 41 supplies the received broadcast acquisition response information to the broadcast information generation unit 43. To do.
- the broadcast information identification information transmitted at the broadcast information acquisition request is returned as the broadcast acquisition response
- the neighboring cell information, the latest broadcast information broadcasted by the base station that received the broadcast information acquisition request, and The identification information may be returned as a notification acquisition response.
- the broadcast information generating unit 43 receives broadcast information for its own station, its identification information, and information necessary for paging from an upper station (upper node) of the base station 10. When the broadcast information and the identification information are received from the higher order node, the broadcast information generation unit 43 stores the received broadcast information and the identification information in the storage unit 44 as history information. The broadcast information generation unit 43 generates paging information based on information received from the upper node.
- the broadcast information generation unit 43 when the latest broadcast information of the neighboring cell is included in the information of the broadcast acquisition response supplied from the neighboring cell broadcast information acquisition unit 41, the latest broadcast information of the neighboring cell. Is confirmed in the history of the notification information stored in the storage unit 44.
- the broadcast information generation unit 43 stores the latest broadcast information of the adjacent cell and its identification information in the storage unit 44 and also updates the latest information of the adjacent cell. Notification processing of neighboring cell broadcast information for transmitting the broadcast information and the identification information thereof to the mobile terminal 20 in communication within the own station is performed.
- Notification processing includes, for example, a method for notifying notification information and identification information of neighboring cells only for calls to mobile terminals that are communicating within the local station, and calls for all mobile terminals located in overlapping areas. There is a method of notifying broadcast information and identification information of neighboring cells.
- the paging information generated by the broadcast information generating unit 43 is transmitted to the mobile terminal 20 located in the cell of the own station via the wireless communication unit 60.
- the storage unit 44 stores broadcast information and identification information history information. From the history information, the latest broadcast information currently broadcast in the cell of the own station can be known.
- the information acquisition request response processing unit 42 receives a broadcast information acquisition request from another base station (base station 11 in the configuration of FIG. 1) via the communication unit 70.
- the information acquisition request response processing unit 42 confirms whether the neighboring cell information included in the broadcast information acquisition request is information indicating the own station. Only when the neighboring cell information is information indicating the own station, the information acquisition request response processing unit 42 executes a response process for the broadcast information acquisition request.
- the information acquisition request response processing unit 42 When receiving the broadcast information acquisition request addressed to the own station, acquires the identification information of the broadcast information currently broadcast in the cell of the local station from the storage unit 44, and the acquired identification information. And the identification information of the broadcast information currently broadcasted in the cell of the requesting base station, included in the received broadcast information acquisition request.
- the information acquisition request response processing unit 42 identifies the latest broadcast information of the local station and its identification information and the identification of the local station. A notification acquisition response including the information is transmitted to the requesting base station.
- the information acquisition request response processing unit 42 includes the identification information of the broadcast information included in the broadcast information acquisition request.
- a notification acquisition response is transmitted to the requesting base station.
- the information acquisition request response processing unit 42 identifies the request source from the identification information of the requesting base station included in the notification information acquisition request.
- the base station 11 and other base stations also have the same configuration as that shown in FIG.
- FIG. 3 shows that the base station 10 manages the cell 11a adjacent to the cell 10a when the mobile terminal 20 located in the cell 10a moves to the vicinity of the overlap area 30 in the configuration shown in FIG.
- FIG. 4 is a schematic diagram for explaining an operation when acquiring the latest broadcast information from the base station 11 and supplying the acquired broadcast information to the mobile terminal 20.
- the mobile terminal 20 transmits the communication quality (reception level) and adjacent cell information of the adjacent cell 11a to the base station 10 (step S10).
- the neighboring cell determination unit 45 of the base station 10 determines whether or not the communication quality of the neighboring cell 11a from the mobile terminal 20 is equal to or higher than a threshold (step S11).
- the adjacent cell broadcast information acquisition unit 41 of the base station 10 is notified of the broadcast information acquisition request (neighbor cell information, identification information of the base station 10, and the cell 10a).
- the identification information of the broadcast information is transmitted to the base station 11 (step S12).
- the broadcast information request response processing unit 42 of the base station 11 is currently broadcast within the cell 10a included in the broadcast information acquisition request.
- the identification information of the broadcast information and the identification information of the broadcast information currently broadcast in the cell 11a of the own station are compared (step S13).
- step S13 if the identification information matches, the broadcast information request response processing unit 42 of the base station 11 transmits a broadcast acquisition response including the broadcast information identification information included in the broadcast information acquisition request to the base station 10. (Step S14).
- step S13 when the identification information does not match, the broadcast information request response processing unit 42 of the base station 11 reports the broadcast information currently broadcast in the cell 11a and the identification information and the identification information of the own station (neighboring cell information). ) Is transmitted to the base station 10 (step S15).
- the neighbor cell broadcast information acquisition unit 41 receives the broadcast acquisition response transmitted from the base station 11 via the communication unit 70, and the received broadcast acquisition response includes the neighbor cell information and the neighbor cell 11a. It is confirmed whether or not the latest notification information and its identification information are included. Only when the broadcast acquisition response includes the adjacent cell information and the latest broadcast information of the adjacent cell 11a and its identification information, the adjacent cell broadcast information acquisition unit 41 supplies the broadcast acquisition response to the broadcast information generation unit 43 (step S16). ).
- the broadcast information generation unit 43 stores the identification information of the latest broadcast information of the neighboring cell 11 a included in the broadcast acquisition response supplied from the neighboring cell broadcast information acquisition unit 41 in the storage unit 44. It is confirmed whether it exists in the log
- step S17 when there is no identification information of the latest broadcast information of the adjacent cell 11a in the history, the broadcast information generation unit 43 stores the latest broadcast information of the adjacent cell 11a and its identification information in the base station 10. The information is stored in the unit 44, and the latest broadcast information and identification information of the adjacent cell 11a are added to the broadcast information currently broadcast. Then, the broadcast information generation unit 43 transmits the broadcast information (broadcast information including the broadcast information and identification information currently broadcast in the own station and the latest broadcast information and identification information broadcast in the adjacent cell) It transmits to the mobile terminal 20 through the communication part 60 (step S18).
- the broadcast information broadcast information including the broadcast information and identification information currently broadcast in the own station and the latest broadcast information and identification information broadcast in the adjacent cell
- step S17 when the identification information of the latest broadcast information of the adjacent cell 11a is in the history, the broadcast information generation unit 43 is currently notified of only the identification information of the latest broadcast information of the adjacent cell 11a. To the broadcast information. Then, the broadcast information generation unit 43 transmits the broadcast information (simultaneous broadcast information including the broadcast information and identification information currently broadcasted in the own station and the identification information of the latest broadcast information broadcasted in the adjacent cell) wirelessly. It transmits to the mobile terminal 20 through the communication unit 60.
- the broadcast information Simultaneous broadcast information including the broadcast information and identification information currently broadcasted in the own station and the identification information of the latest broadcast information broadcasted in the adjacent cell
- the cell 10a and 11a when different broadcast information is broadcast between the cells 10a and 11a and the mobile terminal 20 in the cell 10a moves to the vicinity of the overlapping area 30 of the cells 10a and 11a, the cell The broadcast information and identification information broadcasted in 11a are supplied to the mobile terminal 20 together with the broadcast information and identification information broadcasted in the cell 10a.
- the mobile terminal 20 when the mobile terminal 20 receives from the base station 10 simultaneous broadcast information in which only the identification information of the latest broadcast information of the adjacent cell 11a is added, the mobile terminal 20 transmits the latest broadcast information of the adjacent cell 11a in the past. Recognize that you are receiving.
- the mobile terminal 20 holds the broadcast information received in the past for each identification information, and refers to the held information to identify the latest broadcast information identification information of the adjacent cell 11a included in the broadcast information. Corresponding broadcast information is acquired.
- it is necessary for the base station side to maintain a history of broadcast information broadcast simultaneously for each mobile terminal, and to confirm step S17 for each mobile terminal.
- step S10 when the mobile terminal transmits the neighboring cell information and the communication quality of the neighboring cell to the base station, the mobile terminal transmits identification information of the terminal itself.
- the neighboring cell determination unit 45 supplies the identification information of the mobile terminal whose communication quality of the neighboring cell is equal to or higher than the threshold to the neighboring cell broadcast information acquisition unit 43.
- step S ⁇ b> 16 when the neighboring cell broadcast information acquisition unit 43 receives the broadcast acquisition response including the latest broadcast information of the neighboring cell, the information on the broadcast acquisition response is identified by the mobile terminal supplied from the neighboring cell determination unit 45. The information is supplied to the notification information generation unit 43 together with the information.
- step S18 the broadcast information generation unit 43 adds the latest broadcast information of the neighboring cell and the identification information of the mobile terminal located in the vicinity of the overlapping area to the broadcast information broadcast in the cell of the local station. Is generated. This broadcast information is broadcast to the mobile terminals in its own cell via the wireless communication unit 60.
- each mobile terminal When each mobile terminal receives broadcast information broadcasted simultaneously, each mobile terminal determines whether or not the identification information of the mobile terminal included in the broadcast information matches the identification information of the own terminal. Only when the identification information matches, the mobile terminal performs a specific process on the received broadcast information.
- the specific process is, for example, a process for displaying simultaneous broadcast information.
- FIG. 4 is a block diagram showing a configuration of a base station of a mobile communication system according to another embodiment of the present invention.
- the mobile communication system of the present embodiment has the same configuration as that shown in FIG.
- Each of the plurality of base stations constituting the mobile communication system of the present embodiment has the configuration shown in FIG.
- the determination result by the adjacent cell determination unit 45 is supplied to the adjacent cell broadcast information acquisition unit 41 and the handover processing unit 50.
- the mobile terminal 20 receives information indicating the communication quality of the cell and a signal including cell information, and information indicating the communication quality of the adjacent cell and a signal including adjacent cell information, respectively.
- the communication quality of the adjacent cell is a result of measuring the reception level (reception power) of the signal (radio wave) from the base station 11 as described above. It is.
- the adjacent cell information is identification information of the base station 11.
- the communication quality of the cell in which the mobile terminal 20 is located is a result of measuring the reception level (reception power) of the signal (radio wave) from the base station 10.
- the cell information is identification information of the base station 10.
- the handover processing unit 50 includes information and cell information indicating communication quality of the local station cell, information indicating adjacent cell communication quality and adjacent cell information from the mobile terminal 20 in the local station cell via the radio communication unit 60. Each signal is received.
- the handover processing unit 50 manages the adjacent cell when the adjacent cell determination unit 45 determines that the communication quality of the adjacent cell is equal to or higher than the threshold and the communication quality of the adjacent cell is higher than the communication quality of the local station cell.
- the handover process to the base station to be performed is performed. Since the handover process is a well-known technique, a detailed description thereof is omitted here.
- the ten broadcast information processing units 40 generate broadcast information including broadcast information broadcasted in the cell 10a and identification information thereof, broadcast information broadcasted in the cell 11a, and identification information thereof. Then, simultaneous broadcast information is transmitted from the wireless communication unit 60 to the mobile terminal 20.
- the handover processing unit 50 of the base station 10 11 is executed.
- the mobile terminal 20 can acquire the broadcast information broadcasted in the cell 11a that is the movement destination and the identification information thereof before the process of the handover to the base station 11 is executed.
- the mobile communication system of this embodiment can be easily applied to existing mobile communication systems.
- the broadcast information acquisition request is “X2-AP: HANDOVER REQUEST”
- the notification information notification of the neighboring cell is “Connection Reconfiguration” of the RRC
- the base station determines whether or not to acquire the latest ETWS information that is urgently broadcast in the neighboring cell from the neighboring cell by performing a threshold judgment on the communication quality of the neighboring cell.
- the present invention is not limited to this.
- the mobile terminal uses GPS (Global Positioning System) or the like to transmit position information indicating the current position of the terminal to the base station, and the base station stores the position information and the position information of the own station held in advance. Based on the above, it may be determined whether or not the mobile terminal is located in the adjacent area. In this case, when the mobile terminal is located in the adjacent area, the latest ETWS information that is urgently notified in the adjacent cell is supplied to the mobile terminal.
- the number of cells managed by one base station may be plural.
- the communication quality is determined for each cell in the procedure of FIG.
- the broadcast information acquisition request includes cell identification information.
- the history of broadcast information also includes cell identification information.
- the mobile terminal can acquire broadcast information (for example, ETWS information) broadcast in each of the cell in which the mobile terminal is located and the neighboring cell, so that the user possessing the mobile terminal On the other hand, more useful notification information can be provided.
- broadcast information for example, ETWS information
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Abstract
Description
10a、11a セル
20 移動端末
30 重複エリア
40 報知情報処理部
41 隣接セル報知情報取得部
42 報知情報取得要求応答処理部
43 報知情報生成部
44 記憶部
45 隣接セル判定部
60 無線通信部
70 通信部
図4は、本発明の他の実施形態である移動通信システムの基地局の構成を示すブロック図である。
Claims (8)
- 移動端末との無線通信が可能な範囲を規定したセルを有し、該セルが、他の基地局の他のセルと隣接して配置される基地局であって、
前記他の基地局と相互通信を行う通信部と、
前記セル内で通信中の移動端末に対して報知情報を一斉報知する報知情報処理部と、を有し、
前記報知情報処理部は、前記通信中の移動端末から、該移動端末が前記セルの前記他のセルに隣接する隣接エリアに位置することを示す情報を受信すると、前記通信部を介して前記他の基地局から、前記他のセル内で現在報知されている他の報知情報を取得し、該取得した他の報知情報を前記通信中の移動端末に送信する、基地局。 - 前記報知情報処理部は、
報知情報およびその識別情報を含む一斉報知情報を生成し、該一斉報知情報を前記通信中の移動端末に対して一斉報知する報知情報生成部と、
前記通信中の移動端末から、前記他の基地局からの信号の受信レベルを測定した第1の受信レベル測定結果と前記他の基地局を識別するための識別情報とを含む通信品質情報を受信し、該通信品質情報の前記第1の受信レベル測定結果が閾値以上であるか否かを判定する判定部と、
前記判定部によって前記第1の受信レベル測定結果が前記閾値以上であると判定された場合に、前記セル内で現在報知されている報知情報を識別するための識別情報を含む報知情報取得要求を、前記通信部を介して前記他の基地局へ送信し、該報知情報取得要求の応答情報を前記他の基地局から前記通信部を介して取得する報知情報取得部と、を有し、
前記報知情報生成部は、前記報知情報取得部にて取得した応答情報が前記他のセル内で報知されている前記他の報知情報およびその識別情報を含む場合に、該他の報知情報および識別情報を前記一斉報知情報に加える、請求の範囲第1項に記載の基地局。 - 前記報知情報処理部は、前記他のセル内で報知されている前記他の報知情報の識別情報を含む自局宛ての報知情報取得要求を前記他の基地局から前記通信部を介して受信する応答処理部を、さらに有し、
前記応答処理部は、前記自局宛ての報知情報取得要求に含まれている前記他の報知情報の識別情報が、前記セル内で現在報知されている報知情報の識別情報と一致するか否かを判定し、一致しない場合は、前記セル内で現在報知されている報知情報およびその識別情報を含む他の応答情報を、前記通信部を介して前記他の基地局に送信し、一致する場合には、前記自局宛ての報知情報取得要求に含まれている前記他の報知情報の識別情報を含む他の応答情報を、前記通信部を介して前記他の基地局に送信する、請求の範囲第2項に記載の基地局。 - 前記報知情報処理部は、前記通信中の移動端末に対して一斉報知された報知情報およびその識別情報が格納される記憶部を、さらに有し、
前記報知情報生成部は、前記報知情報取得部にて取得した応答情報に含まれている前記他の報知情報の識別情報が前記記憶部に格納されているか否かを判定し、格納されていない場合は、該応答情報に含まれている前記他の報知情報および識別情報を前記一斉報知情報に加え、格納されている場合には、該応答情報に含まれている前記他の報知情報の識別情報のみを前記一斉報知情報に加える、請求の範囲第2項または第3項に記載の基地局。 - 前記通信中の移動端末から、前記第1の受信レベル測定結果と自局からの信号の受信レベルを測定した第2の受信レベル測定結果とをそれぞれ取得し、前記第1の受信レベル測定結果が前記閾値以上であり、かつ、前記第1の受信レベル測定結果が前記第2の受信レベル測定結果より高い場合に、前記通信中の移動端末について、前記他の基地局へのハンドオーバの処理を実施するハンドオーバ処理部を、さらに有する、請求の範囲第2項から第4項のいずれかに記載の基地局。
- 前記報知情報処理部は、前記通信中の移動端末から、該移動端末の現在位置に関する位置情報を取得し、該取得した位置情報と予め保持している自局の位置情報とに基づいて、前記通信中の移動端末が前記隣接エリアに位置するか否かを判定する、請求の範囲第1項に記載の基地局。
- 移動端末と、該移動端末の無線通信が可能な範囲を規定したセルを有する複数の基地局とを有し、各基地局のセルが隣接して配置される移動通信システムであって、
前記各基地局のそれぞれは、
自局に隣接して配置された他の基地局と相互通信を行う通信部と、
自局のセル内で通信中の移動端末に対して報知情報を一斉報知する報知情報処理部と、を有し、
前記報知情報処理部は、前記通信中の移動端末から、該移動端末が前記自局のセルの前記他の基地局の他のセルに隣接する隣接エリアに位置することを示す情報を受信すると、前記通信部を介して前記他の基地局から、前記他のセル内で現在報知されている他の報知情報を取得し、該取得した他の報知情報を前記通信中の移動端末に送信する、移動通信システム。 - 移動端末との無線通信が可能な範囲を規定したセルを有し、該セルが、他の基地局の他のセルと隣接して配置される基地局にて行われる報知情報送信方法であって、
前記セル内で通信中の移動端末に自局用の報知情報を送信し、
前記通信中の移動端末から、該移動端末が前記セルの前記他のセルに隣接する隣接エリアに位置するか否かを判定可能な信号を受信し、
前記受信信号に基づいて、前記通信中の移動端末が前記隣接エリアに位置すると判定した場合に、前記他の基地局から、前記他のセル内で現在報知されている他の報知情報を取得し、該取得した他の報知情報を前記自局用の報知情報とともに前記通信中の移動端末に送信する、情報通信制御方法。
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