JP2007312037A - Base station, control station, and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base station which precisely sets up parameter information for wireless communication which it announces and reduces workload at the time of setting up the parameter information, and also to provide a control station and a communication method. <P>SOLUTION: The base station is equipped with a first receiver which receives event information sent by a mobile station when the mobile station moves; first transmitter which transmits request information for requesting base station information including a base station ID, for identifying other base station which has ever communicated with the mobile station transmitting the event information and parameter information, for wireless communication which is set up in the other base station to the other base station or the control station; second receiver which receives the base station information transmitted by the other base station or the control station; management portion which manages to store the received base station information when it received the base station information; and second transmitter which transmits the base station information of itself to the other base station stored in the storage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a base station, a control station, and a communication method that are arranged in a mobile communication system including a plurality of base stations that perform radio communication with a mobile station and a control station that is above the plurality of base stations. About.

  2. Description of the Related Art Conventionally, in a mobile communication system, as a multiple access scheme in which a plurality of mobile stations share a radio transmission line and communicate at the same time, a code division multiple access (CDMA: Code Division Multiple Access) scheme, wideband and code division Known are a multiple access method (W-CDMA: Wideband CDMA), a time division multiple access method (hereinafter referred to as TDMA), a frequency division multiple access method (hereinafter referred to as FDMA). .

  Among the multiple access methods described above, for example, in a mobile communication system that shares the same frequency band with a plurality of wireless communication waves by the CDMA method, each wireless communication wave is distinguished by a spreading code that is a random code sequence. It is configured as follows.

  In particular, spreading codes used in W-CDMA mobile communication systems can reduce mutual interference between different spreading codes in order to realize high-quality communication even with low transmission power in addition to high detection characteristics and identification characteristics. Code orthogonality is required. For this reason, the number of spreading codes that can be allocated is smaller than that of the uplink. In addition, such spreading codes are repeatedly used in all cells for effective use, but different codes are superposed on each base station in order to prevent interference between base stations (between cells).

  In a W-CDMA mobile communication system, a spreading code that actually spreads user data over a wide band is called a channelization code, and an inter-cell interference prevention code that is superimposed for each base station (cell) is This is called a downstream scrambling code.

  In such a mobile communication system, the mobile station detects the base station of the communication destination based on the downlink scrambling code broadcast from each base station. Further, in such a mobile communication system, the base station uses a table (hereinafter referred to as a peripheral zone table) for parameter information for wireless communication such as a downlink scrambling code used in other base stations located in the vicinity of the mobile station. And the downlink scrambling code is broadcast to the mobile station through the control channel.

  When the mobile station switches the communication destination base station by movement (for example, handover), the mobile station detects the communication destination base station at a higher speed based on the downlink scrambling code broadcast before the movement. .

  Further, in the above-described mobile communication system, for example, when a base station is newly established, other base stations (cells) located around the newly established base station (cell) are specified, and scrambling of the specified other base stations is performed. It is necessary to set the ring code in the peripheral zone table of the newly installed base station. Furthermore, it is necessary to set a new scrambling code assigned to the newly installed base station in the peripheral zone table of another base station located in the vicinity.

  Here, when other base stations located around the newly installed base station are identified, the neighboring base stations may be identified based on the positional relationship in topology of the new base station.

However, the actual radio range of the base station may differ from the radio range on the topology due to, for example, the influence of a structure or the like, and the setting information in the peripheral zone table may not be accurate. Therefore, in order to set the peripheral zone table more accurately, a method of measuring a radio signal locally has been taken.
Heisei 11-215552 gazette

  However, the measurement work of the radio signal on site requires a wide radio range measurement, and therefore a work load is applied.

  Therefore, the present invention has been made in view of the above-described problem. In the base station, the radio communication parameter information broadcast by the base station is set with high accuracy and the work load during the setting is reduced. It is an object to provide a station, a control station, and a communication method.

  In order to achieve the above object, a first feature of the present invention is arranged in a mobile communication system including a plurality of base stations that perform radio communication with a mobile station and a control station that is above the plurality of base stations. The base station, the first receiving unit that receives event information that is transmitted when the mobile station moves, and another mobile station that has previously communicated with the mobile station that transmitted the event information. Request information for requesting base station information including a base station ID for identifying a base station and parameter information for wireless communication set in the other base station is sent to the other base station or the control station. A first transmitter that transmits to the base station, a second receiver that receives the base station information transmitted from the other base station or the control station, and the base station information received when the base station information is received. A storage unit that stores data in the storage unit, and the storage unit The storage and said other base station, it is an Abstract by comprising a second transmission unit for transmitting the base station information of own station. According to the base station according to the first feature, based on event information transmitted when the mobile station moves, another base station previously communicated with the mobile station to another base station or a higher-level control station. Requests base station information related to the station, receives the requested base station information, and stores it in the storage unit. Therefore, according to this invention, based on the radio range of another base station received by the mobile station, other base stations located in the vicinity can be identified with high accuracy, and the other base stations located in the vicinity are related. The base station information can be stored in the storage unit. In addition, since the base station information of the local station is transmitted to another base station stored in the storage unit, the base station information of the local station can be stored also in the other base station. In addition, since the work stored in the storage unit that has been conventionally performed is automatically performed, it is possible to reduce the work load when a base station is newly installed, which is particularly a lot of work to be stored in the storage unit.

  In the first feature of the present invention, the event information may be location registration request information for requesting a change of a location registration area indicating a location where the mobile station exists. According to this invention, the base station requests the base station information related to the other base station previously communicated with the mobile station, using the location registration request information transmitted when the mobile station moves as a trigger, and the request The received base station information is received and stored in the storage unit. Therefore, according to this invention, other base stations with adjacent wireless communication ranges can be specified by the position registration request information transmitted from the mobile station, so that other base stations located in the vicinity can be specified with high accuracy. At the same time, base station information related to other base stations located in the vicinity can be stored in the storage unit.

  Further, in the first feature of the present invention, the event information is received from the mobile station in order to request reconnection of communication when communication between the other base station and the mobile station is disconnected. It may be reconnection request information to be transmitted. According to this invention, the base station requests base station information related to another base station that has previously communicated with the mobile station, triggered by the reconnection request information transmitted when the mobile station is disconnected due to movement. At the same time, the requested base station information is received and stored in the storage unit. Therefore, according to this invention, other base stations with adjacent wireless communication ranges can be specified by the reconnection request information transmitted from the mobile station, so that other base stations located in the vicinity can be specified with high accuracy. At the same time, base station information related to other base stations located in the vicinity can be stored in the storage unit.

  In the first feature of the present invention, the management unit may store only the base station information that is not stored in the storage unit when the base unit information is stored in the storage unit.

  In the first feature of the present invention, the request information includes a mobile station ID for identifying a mobile station that has transmitted the event information, and receives request information transmitted from another base station. A determination unit that determines whether or not the own station has previously communicated with the mobile station that transmitted the event information, based on a mobile station ID included in the received request information; When the determination unit determines that communication has been performed before, the base station information of the own station may be further included in the third transmission unit that transmits the request information to the other base station.

  A second feature of the present invention is a control station having a plurality of base stations communicating wirelessly with a mobile station at a lower level, and is set in a base station ID for identifying the base station and the base station A storage unit that stores base station information including parameter information for wireless communication, and the base station that has previously communicated with the mobile station from the base station that has received event information transmitted when the mobile station moves A first receiving unit that receives request information for requesting the base station information, and the mobile station that has transmitted the request information based on the base station information stored in the storage unit. And a transmitter that transmits the base station information of the base station that has communicated with the base station.

  In the second feature of the present invention, a location registration area for managing the location where the mobile station exists, an area storage unit for storing the location in association with the base station, and a new location registration from the base station A second receiving unit that receives area allocation request information that requests area allocation, and a new location registration area and a base station that has transmitted the area allocation request information when receiving area allocation request information are in a one-to-one relationship. An area setting unit that stores the information in the area storage unit may be further included.

  According to this invention, since a new location registration area is assigned to the base station that transmitted the area allocation request information, event information (for example, location registration) when the mobile station moves to the radio range of the base station. The frequency of transmitting (request information) increases, and the frequency of transmitting base station information to the base station increases.

  Therefore, according to this invention, since the frequency of transmitting base station information to the base station increases, the base station information of other base stations is stored earlier in the base station.

  A third feature of the present invention is a communication method in a mobile communication system comprising a plurality of base stations that perform radio communication with a mobile station, and a control station that is above the plurality of base stations. A station storing base station information including a base station ID for identifying the base station and parameter information for wireless communication set in the base station; and the base station has moved the mobile station Receiving the event information transmitted at the time, a base station ID for identifying another base station previously communicated with the mobile station from which the base station transmitted the event information, and the other base station Transmitting request information for requesting base station information including parameter information for wireless communication set in the control station to the control station, and the control station transmitting when the mobile station moves Receive event information Receiving from the base station request information requesting the base station information of the base station previously communicated with the mobile station, based on the base station information stored by the control station, Transmitting the base station information of the base station previously communicated with the mobile station to the base station that transmitted the request information; and the base station transmitted from the control station. A step of receiving information; a step of storing the received base station information when the base station receives the base station information; and another base corresponding to the base station information stored by the base station. And a step of transmitting the base station information of the own station to the station.

  A fourth feature of the present invention is a communication method in a mobile communication system comprising a plurality of base stations that perform wireless communication with a mobile station, wherein the first base station transmits when the mobile station moves. Receiving event information, and a base station ID for identifying a base station with which the first base station previously communicated with the mobile station that transmitted the event information, and the base station is set. Including the mobile station ID for identifying the mobile station that transmitted the event information in the request information for requesting the base station information including the parameter information for the wireless communication being transmitted to the second base station And whether or not the second base station has previously communicated with the mobile station that has transmitted the event information based on the mobile station ID included in the received request information. Determining, and If it is determined in step 4 that the two base stations have communicated before, the base station information of the local station is transmitted to the first base station that transmitted the request information; and the first base station A station storing the received base station information in a storage unit; and the first base station transmits its own base station information to the second base station stored in the storage unit. And the step of performing.

  According to the present invention, a base station, a control station, and a communication method are provided in which a base station sets wireless communication parameter information broadcast by the own station with high accuracy and reduces the workload during the setting. Can do.

  An embodiment of the present invention will be described with reference to FIGS. In each drawing referred to in the following description, parts having the same function are denoted by the same reference numerals, and repeated description is omitted.

(Outline of mobile communication system)
First, an overview of the mobile communication system 1 according to the present embodiment will be described with reference to FIGS. 1 to 4. In this embodiment, as shown in FIG. 1, a mobile communication system 1 including a centralized control station 301, control routers 201 to 202, and base stations 101 to 103 is connected to a base station 104 as shown in FIG. As an example, each function when the mobile communication system 1 performs a peripheral zone table update process (described later) will be described.

  In the mobile communication system 1 according to the present embodiment, in the cells C101 to C104 formed by the base stations 101 to 104, the mobile stations existing in the cells and the base stations 101 to 104 are in the same frequency band. A CDMA (Code Division Multiple Access) method is used in which communication is performed while sharing the communication. Note that the mobile communication system 1 according to the present embodiment assumes an FDD (Frequency Division Duplex) method and a TDD (Time Division Duplex) method in the CDMA method, but the mobile communication system 1 has the CDMA method described above. In addition to this, a time division multiple access (TDMA) system, a frequency division multiple access (FDMA) system, and the like may be assumed.

  The base stations 101 to 104 perform wireless communication with the mobile stations 501 to 502 existing in the cells C101 to C104. Also, in each base station forming each cell, a downlink scrambling code that is different for each base station, that is, a spreading code used in the downlink, is set as parameter information for wireless communication.

  Further, in each base station 101 to 104, with respect to the cells C101 to C104 formed by the own station, a base station ID for identifying the base stations 101 to 104 forming the cells C101 to C104 located in the vicinity, and the surrounding base stations A peripheral zone table for storing the scrambling codes used in the stations 101 to 104 in association with each other is provided. Details of the peripheral zone table will be described later. Then, the base stations 101 to 104 inform the mobile station existing in the cells C101 to C104 formed by the own station of information in the peripheral zone table.

  Further, in the mobile communication system 1 shown in FIG. 1, the base stations 101 to 102 include the peripheral zone table T11 shown in FIG. For example, in the peripheral zone table T11 of the base station 101, the base station ID (B101) of the own station, the base station ID (B102) for identifying the base station 102 located in the vicinity, and the base stations 101 to 102 are set. Are stored in association with each other.

  Further, the base station 103 includes a peripheral zone table T13 shown in FIG. As shown in FIG. 1, since the base stations 101 to 102 do not exist in the vicinity of the base station 103, the base station ID (B103) of the local station and the local station are set in the peripheral zone table T13. Only the scrambling code (15) is stored in association.

  As shown in FIG. 3, in the mobile communication system 1 in which the base station 104 is newly installed, the base stations 101 to 102 include the peripheral zone table T <b> 11 shown in FIG. The base station 103 has a peripheral zone table T13 shown in FIG. 4B, and the base station 104 has a peripheral zone table T14 shown in FIG. 4C.

  As shown in FIG. 4A, in the peripheral zone table T11 of the base station 101, the base station ID (B101) of the own station and the base station IDs (B102 and B104) identifying the base stations 102 to 104 located in the vicinity are shown. ) And the respective scrambling codes (10, 19 and 24) set in the respective base stations 101 to 104 are stored in association with each other.

  Further, as shown in FIG. 4B, in the peripheral zone table T13 of the base station 103, the base station ID (B103) of the own station and the base station ID (B104) for identifying the base stations 104 located in the vicinity are included. The scrambling codes (15 and 24) set in each base station are stored in association with each other.

  Further, as shown in FIG. 4C, in the peripheral zone table T14 of the base station 104, the base station ID (B104) of the own station and the base station ID (B101) for identifying the base stations 101 to 103 located in the vicinity are shown. To B103) and the scrambling codes (10, 19, 15 and 24) set in the respective base stations 101 to 104 are stored in association with each other.

  In the present embodiment, a set of a base station ID for identifying one base station and a scrambling code (parameter information for wireless communication) used in the base station will be described as base station information. .

  In the mobile communication system 1 according to the present embodiment, one or a plurality of cells C101 to C104 formed by the base stations 101 to 104 are combined to form a location registration area. Here, the above-described location registration area is a unit of an area for the central control station 301 to manage the locations of the mobile stations 501 to 502 and may be called a paging area.

  In this embodiment, the cells C101 to C102 formed by the base stations 101 to 102 belong to the location registration area 401, the cell C103 formed by the base station 103 belongs to the location registration area 402, and the base station 104 forms. A case where the cell C104 to be assigned belongs to the location registration area 499 will be described as an example.

  In the mobile communication system 1 according to the present embodiment, the base stations 101 to 102 and the base station 104 are accommodated in the upper control router 201, and the base station 103 is accommodated in the upper control router 202. Yes.

  The central control station 301 accommodates the control routers 201 to 202 and the base stations 101 to 104. The central control station 301 accommodates mobile stations 501 to 502 that perform wireless communication with the base stations 101 to 104.

  The base stations 101 to 104 communicate with each other via the control routers 201 to 202 and also communicate with the central control station 301 via the control routers 201 to 202.

  In the mobile communication system 1 according to the present embodiment, the numbers of the central control station 301, the control routers 201 to 202, and the base stations 101 to 104 are merely examples, and for example, processing load is distributed. For this purpose, a plurality of central control stations 301 may be provided. Further, regarding the location registration areas 401 to 402 and the location registration area 499 described above, the relationship between the cells C101 to C104 may belong to any of the location registration areas 401 to 402 and the location registration area 499.

(Configuration of mobile communication system)
Next, the configuration of the mobile communication system 1 according to the present embodiment will be described with reference to FIGS. First, the configuration of the base stations 101 to 104 will be described. Here, since the configurations of the base stations 101 to 104 are the same, the configuration of the base station 101 will be described.

  As shown in FIG. 5, the base station 101 includes a receiving unit 1011, a transmitting unit 1012, an area allocation requesting unit 1013, an area setting unit 1014, a connection history storage unit 1015, a peripheral zone table storage unit 1016, A peripheral base station search unit 1017, a peripheral zone table management unit 1018, and a control unit 1019 are provided.

  The receiving unit 1011 functions as a first receiving unit that receives event information transmitted from the mobile stations 501 to 502 when the mobile stations 501 to 502 move. Further, the event information according to the present embodiment includes the location registration request information transmitted when the mobile stations 501 to 502 request to change the existing location registration areas 401 to 402 and the location registration area 499, or the mobile station 501. Reference numerals 502 to 502 denote reconnection request information transmitted to request communication reconnection when communication with the other base stations 101 to 104 is disconnected.

  Further, the receiving unit 1011 includes location registration area allocation information, original location registration area information, peripheral zone table request information (peripheral ZT request information) transmitted from the central control station 301 and other base stations 102 to 103, Peripheral zone table response information (peripheral ZT response information), peripheral zone table addition request information (peripheral ZT addition request information), communication disconnection source inquiry information, and communication disconnection source response information are received.

  The location registration area allocation information is information for notifying that a new location registration area has been allocated, and includes a location registration area ID for identifying the new location registration area. Further, the original location registration area information is information indicating the location registration areas 401 to 402 where the mobile stations 501 to 502 were previously located, and corresponds to the base stations 101 to 104 that form cells belonging to the location registration area. Base station information is included. The peripheral zone table request information requests that all base station information stored in the peripheral zone tables T11 to T14 be transmitted to the other base stations 101 to 104 that transmitted the peripheral zone table request information. Information. The peripheral zone table response information is information corresponding to the peripheral zone table request information, and all the bases stored in one peripheral zone table (for example, the peripheral zone table T11) are included in one peripheral zone table response information. Station information is included. The peripheral zone table addition request information is information requesting to add base station information to the peripheral zone tables T11 to T14, and the peripheral zone table addition request information includes base station information of other base stations. It is. The receiving unit 1011 functions as a second receiving unit that receives the base station information transmitted from the other base stations 102 to 104 or the centralized control station 301 by receiving the peripheral zone table addition request information. Yes. The receiving unit 1011 functions as a third receiving unit by receiving the original location registration area information and the communication disconnection source response information transmitted from the other base stations 102 to 104 or the centralized control station 301. . The communication disconnection source inquiry information is information for requesting base station information to the base stations 101 to 104 whose communication with the mobile stations 501 to 502 that transmitted the reconnection request information has been disconnected. The mobile station ID that identifies the mobile stations 501 to 502 that transmitted the request information is included. The communication disconnection source response information is information responding to the above-described communication disconnection inquiry information, and includes base station information of the base stations 101 to 104 in which communication with the mobile stations 501 to 502 is disconnected.

  The transmission unit 1012 sends location registration area allocation request information, original location registration area request information, peripheral zone table request information, and peripheral zone table response information to the centralized control station 301 or other base stations 102 to 104. The peripheral zone table addition request information, the communication disconnection source inquiry information, and the communication disconnection source response information are transmitted.

  The location registration area allocation request information is information for requesting allocation of a location registration area that has a one-to-one correspondence with the own station, and includes the base station IDs of the source base stations 101 to 104. The original location registration area request information is information for requesting in which location registration area the mobile stations 501 to 502 that transmitted the location registration request received by the receiving unit 1011 existed. A mobile station ID to be identified is included.

  Here, the transmission unit 1012 uses the function of transmitting the communication disconnection source inquiry information and the original location registration area request information to transmit the other base station 101 that has previously communicated with the mobile stations 501 to 502 that transmitted the event information. Request information for requesting base station information including a base station ID for identifying through 104 and scrambling codes (parameter information for wireless communication) set in the other base stations 102 through 104, It functions as a first transmission unit that transmits to the base stations 102 to 104 or the centralized control station 301. Further, the transmission unit 1012 functions as a second transmission unit that transmits base station information of the local station by transmitting peripheral zone table addition request information including the base station information of the local station. The transmission unit 1012 functions as a third transmission unit that transmits base station information of the local station by transmitting communication disconnection source response information including the base station information of the local station.

  The area allocation request unit 1013 transmits location registration area allocation request information to the centralized control station 301 via the transmission unit 1012 when the base station 101 is activated or a predetermined operation by the administrator is performed.

  When the reception unit 1011 receives the location registration area allocation information, the area setting unit 1014 sets the location registration area of the own station based on the location registration area ID included in the location registration area allocation information. In addition, after setting the location registration area, the area setting unit 1014 notifies the neighboring base station search unit 1017 described later that the setting is completed.

  The connection history storage unit 1015 includes a communication disconnection history table T101. As shown in FIG. 6, the communication disconnection history table T101 stores the mobile station ID for identifying the mobile stations 501 to 502 with which the local station is communicating, and the date and time when the communication was disconnected in association with each other.

  The peripheral zone table storage unit 1016 includes a peripheral zone table T11. The peripheral zone table T11 is stored in association with the base station ID for identifying the own station and the other base stations 101 to 104, and the parameter information for wireless communication set in the own station and the other base stations 101 to 104. To do.

  Specifically, as shown in FIGS. 2A and 4A, the peripheral zone table T11 according to the present embodiment includes a base station ID for identifying the own station and the other base stations 101 to 104, and a wireless As communication parameter information, the scrambling codes set in the own station and other base stations 101 to 104 are stored in association with each other.

  In this embodiment, the case where the parameter information for wireless communication is a scrambling code will be described as an example. However, the parameter for wireless communication is a downlink time slot in a TDMA mobile communication system. Alternatively, it may be a downlink frequency band in an FDMA mobile communication system.

  When the neighboring base station search unit 1017 is notified by the area setting unit 1014 that the setting of the location registration area has been completed, the neighboring base station searching unit 1017 sends the neighboring zone table request information to the other base stations 102 to 104 via the transmitting unit 1012. Send. In addition, when the reception unit 1011 receives event information transmitted from the mobile stations 501 to 502, the neighboring base station search unit 1017 previously communicated with the mobile stations 501 to 502 that transmitted the event information. The base station ID for identifying the other base stations 102 to 104 and the request information for requesting the base station information of the other base stations 101 to 104 are sent via the transmitter 1012 to the other base stations 102 to 104 or Transmit to the central control station 301.

  Specifically, when the reception unit 1011 receives the position registration request information, the neighboring base station search unit 1017 transmits the original position to the other base stations 102 to 104 or the centralized control station 301 via the transmission unit 1012. Send registration area request information. In addition, when the receiving unit 1011 receives the reconnection request information, the neighboring base station searching unit 1017 sends a communication disconnection source inquiry to the other base stations 102 to 104 or the centralized control station 301 via the transmitting unit 1012. Send information. In addition, when the receiving unit 1011 receives communication disconnection source inquiry information, the neighboring base station search unit 1017 stores the mobile station ID included in the communication disconnection source inquiry information in the communication disconnection history table T101 of the local station. It is determined whether or not it has been done. If the neighboring base station search unit 1017 determines that the information is stored in the communication disconnection history table T101, the communication disconnection source response information including the base station ID of the local station and the scrambling code set in the local station. And the generated communication disconnection source response information is transmitted to the other base stations 102 to 104 that have transmitted the communication disconnection source inquiry information via the transmission unit 1012.

  The peripheral zone table management unit 1018 functions as a management unit that stores the received base station information in the storage unit when the reception unit 1011 receives the base station information. Specifically, when the reception zone 1011 receives the peripheral zone table addition request information, the communication disconnection source response information, and the original location registration area information in the reception unit 1011, the peripheral zone table management unit 1018 is included in the received information. It is determined whether or not the base station information is stored in the peripheral zone tables T11 to T13, and only the base station information that is not stored is stored in the peripheral zone table T11. In addition, when the peripheral zone table management unit 1018 stores the base station information in the peripheral zone table T11, it transmits the other base stations 102 to 104 corresponding to the stored base station information via the transmission unit 1012. The peripheral zone table addition request information including the base station information of the own station is transmitted. Further, when the reception unit 1011 receives the peripheral zone table request information, the peripheral zone table management unit 1018 generates peripheral zone table response information including all base station information stored in the local zone table T11 of the local station. To do. Then, the peripheral zone table management unit 1018 transmits the generated peripheral zone table response information to the base stations 102 to 104 that transmitted the peripheral zone table request information via the transmission unit 1012. In addition, when the reception unit 1011 receives the peripheral zone table response information, the peripheral zone table management unit 1018 specifies one of the base station information included in the received peripheral zone table response information, and It is stored in the zone table T11.

  The control unit 1019 controls various functions provided in the base station 101. In addition, the control unit 1019 notifies the scrambling codes stored in the peripheral zone table T11 to the mobile stations 501 to 502 via the transmission unit 1012 through the control channel.

  Next, the configuration of the control routers 201 to 202 will be described. Since the configuration of the control routers 201 to 202 is the same, the configuration of the control router 201 will be described.

  As illustrated in the example of FIG. 7, the control router 201 includes a reception unit 2011, a transmission unit 2012, and a control unit 2013. The receiving unit 2011 receives various information transmitted from the base stations 101 to 104 and the central control station 301. The transmission unit 2012 transmits various information to the base stations 101 to 104 and the central control station 301. The control unit 2013 controls various functions provided in the control router 201, and performs transmission / reception control of various information between the base stations 101 to 104 and the centralized control station 301.

  Next, the configuration of the central control station 301 will be described. As illustrated in the example of FIG. 8, the central control station 301 includes a reception unit 3011, a transmission unit 3012, an area allocation unit 3013, a base station setting storage unit 3014, a connection history storage unit 3015, and neighboring base station search. Part 3016.

  The receiving unit 3011 receives the location registration area allocation request information, the original location registration area request information, and the communication disconnection source inquiry information transmitted from the base stations 101 to 104.

  The transmission unit 3012 transmits location registration area allocation information, original location registration area information, and communication disconnection source response information to the base stations 101 to 104.

  When the receiving unit 3011 receives the location registration area allocation request information, the area allocation unit 3013 determines a location registration area to be newly allocated, the base station ID included in the location registration area allocation request information, and the determined location The location registration area ID for identifying the registration area is associated and stored in a location registration area table T33 described later. Also, the area allocation unit 3013 transmits location registration area allocation information including the allocated location registration area ID to the base stations 101 to 104 that transmitted the location registration area allocation request information via the transmission unit 3012.

  The base station setting storage unit 3014 includes a wireless parameter table T31. As shown in the example of FIG. 9, the radio parameter table T31 associates the base station ID for identifying the accommodated base stations 101 to 104 with the scrambling code set in the base stations 101 to 104. Remember.

  The connection history storage unit 3015 includes a location registration area history table T32 and a location registration area table T33. As illustrated in the example of FIG. 10A, the location registration area history table T32 stores a mobile station ID that identifies the mobile stations 501 to 502 and a location registration area ID that identifies the location registration area in association with each other. In the location registration area history table T32, the mobile station ID and the associated location registration area ID are updated based on location registration request information transmitted each time the mobile stations 501 to 502 move in the location registration area. The Therefore, the location registration area history table T32 shows a history of communications performed previously between the mobile stations 501 to 502 and the base stations 101 to 104. In the location registration area history table T32, the mobile stations 501 to 502 may change the location registration area due to movement, or may hold the previous location registration area ID for a predetermined time (for example, 1 hour). Good.

  As shown in the example of FIG. 10B, the location registration area table T33 stores the location registration area ID and the base station IDs of the base stations 101 to 104 forming cells belonging to the location registration area in association with each other. To do.

  When the receiving unit 3011 receives the original location registration area request information, the neighboring base station search unit 3016 refers to the location registration area history table T32 and based on the mobile station ID included in the original location registration area request information. The location registration area ID is specified. Then, the neighboring base station search unit 3016 refers to the location registration area table T33 and identifies the base station ID stored in association with the identified location registration area ID. Also, the neighboring base station search unit 3016 generates original location registration area information including the identified base station ID, and transmits the original location registration area request information to the base stations 101 to 104 that have transmitted the original location registration area request information via the transmission unit 3012. .

  Next, the configuration of the mobile stations 501 to 502 will be described. Since the mobile stations 501 to 502 have the same configuration, the configuration of the mobile station 501 will be described.

  As shown in the example of FIG. 11, the mobile station 501 includes a reception unit 5011, a transmission unit 5012, a location registration area change detection unit 5013, a communication disconnection detection unit 5014, and a control unit 5015.

  The receiving unit 5011 receives various information transmitted from the base stations 101 to 104. The transmission unit 5012 transmits location registration request information, which is event information, and reconnection request information to the base stations 101 to 104.

  The location registration area change detection unit 5013 detects that the location registration area in which the station is located has been changed due to the movement of the station, etc., and communicates with the station via the transmission unit 5012 The location registration information including the mobile station ID of the local station is transmitted to 101 to 104.

  The communication disconnection detection unit 5014 detects that the communication between the own station and the base stations 101 to 104 has been disconnected, and performs the cell search to the base stations 101 to 104 that can receive the downlink. Reconnection request information including the mobile station ID of the local station is transmitted.

  A control unit 5015 controls various functions of the mobile station 501.

  In the present embodiment, the mobile station 501 described above is assumed to be a mobile device such as a mobile phone, a PDA (Personal Digital Assistant), or a notebook computer.

(Operation of mobile communication system)
Next, the operation of the mobile communication system 1 according to this embodiment will be described. In the mobile communication system 1, when the base station 104 is newly established, the base station 104 and the centralized control station 301 perform a location registration area setting process, and when the base station 104 is in operation after the new establishment, the base stations 101 to 104 are centrally controlled. The station 301 performs the peripheral zone table update process.

  Further, in the mobile communication system 1, the above-described peripheral zone table update process is performed when the location registration area of the mobile station is changed and when communication with the mobile station is reconnected. Hereinafter, specific operations of the location registration area setting process and the peripheral zone table update process of the mobile communication system 1 according to the present embodiment will be described.

(Operation of location registration area setting process)
With reference to FIG. 12, the operation | movement of the location registration area setting process in the mobile communication system 1 which concerns on this embodiment is demonstrated. Here, the base station 104 is a newly installed base station, and the base stations 101 to 103 are already installed base stations.

  In step S <b> 101 of FIG. 12, in the base station 104, the area allocation request unit 1013 transmits location registration area request information to the centralized control station 301 by activation or a predetermined operation by the administrator.

  In step S102, in the centralized control station 301, the receiving unit 3011 receives location registration area allocation request information. In addition, the area allocation unit 3013 associates the base station ID (B104) included in the received location registration area allocation request information with the location registration area ID (P499) for identifying the newly allocated location registration area 499, and Store in the registration area table T33. The area allocation unit 3013 transmits location registration area allocation information including the allocated location registration area ID (P499) to the base station 104.

  In step S103, the base station 104 receives the location registration area allocation information, and sets the location registration area 499 of the own station based on the location registration area ID (B499) included in the received location registration area allocation information. In addition, the base station 104 transmits peripheral zone table request information (peripheral ZT request information) to the base stations 101 to 103. At this time, the transmission destination for transmitting the peripheral zone table request information may be all the base stations 101 to 103 accommodated in the centralized control station 301, or the base stations 101 to 102 accommodated in the control router 201. It may be.

  In step S104, the base station 104 receives peripheral zone table response information (peripheral ZT response information).

  In step S105, the base station 104 identifies one piece of base station information included in the received surrounding zone table response information, and stores it in the surrounding zone table T14 of its own station. Here, the method for identifying one of the base station information is based on all base station information included in the peripheral zone table response information transmitted from the base stations 101 to 103, and the most frequently included base station information. Is stored in the peripheral zone table T14. In this embodiment, a case where the base station 104 specifies base station information of the base station 101 will be described as an example. Note that this specifying method is not limited to this. For example, the base station information of the base station that transmitted the earliest received peripheral zone table response information may be specified as the base station information stored in the peripheral zone table T14. Good. When the base station 104 completes the storage in the peripheral zone table T14, the base station 104 notifies the scrambling code stored in the peripheral zone table T14 through the control channel, and starts the operation of the base station 104.

  In step S106, the base station 104 sends, to the base station 101 corresponding to the base station information stored in the peripheral zone table T14, peripheral zone table addition request information (peripheral ZT addition request information) including its own base station information. Send.

  In step S107, the base station 101 stores the base station information of the base station 104 included in the received peripheral zone table addition request information in the peripheral zone table T11.

  As described above, in the mobile communication system 1, the location registration area setting process described above is performed, whereby the location registration area 499 is allocated to the base station 104 and a specific base station (for example, , The base station 101) is stored and the operation is started.

(First peripheral zone table update process when location registration area is changed)
The operation of the first peripheral zone table update process will be described with reference to FIG. First, a specific operation of the peripheral zone table update process in which the base stations 101 to 104 including the newly established base station 104 update the peripheral zone tables T11 to T14 during operation will be described.

  In the base station setting storage unit 3014 of the centralized control station 301, a base station ID and a scrambling code are stored in association with each other in the radio parameter table T31.

  In step S201, when the mobile station 501 moves from a cell (for example, cell C101) formed by a base station (for example, the base station 101) different from the newly installed base station 104 to a cell C104 formed by the base station 104, The location registration area change detection unit 5013 detects that the location registration area has been moved to the location registration area 499.

  In step S202, in the mobile station 501, the location registration area change detection unit 5013 transmits location registration information including the mobile station ID of the mobile station to the base station 104 forming the destination cell C104. The location registration request information is received.

  In step S <b> 203, the base station 104 transmits the original location registration area request information to the central control station 301. Here, the original location registration area request information includes the mobile station ID (U501) of the mobile station 501 that transmitted the location registration request information.

  In step S <b> 204, the central control station 301 receives the original location registration area request information at the reception unit 3011. Also, the neighboring base station search unit 3016 refers to the location registration area history table T32 and identifies the location registration area ID (for example, P499) based on the mobile station ID included in the received original location registration area request information. . Then, the neighboring base station search unit 3016 refers to the location registration area table T33 and identifies the base station ID (B101 to B102) associated with the identified location registration area ID. In addition, the neighboring base station search unit 3016 generates original location registration area information including the identified base station ID (B101 to B102), and transmits it to the base station 104.

  In step S205, the base station 104 receives the original location registration area information transmitted from the central control station 301.

  In step S206, the base station 104 determines whether or not the base station information included in the received information is stored in the peripheral zone table T14, and the base station information that is not stored (for example, the base station information of the base station 102). Only station information) is stored in the peripheral zone table T14.

  In step S207, the base station 104 sends, to the base station 102 corresponding to the base station information stored in the peripheral zone table T14, peripheral zone table addition request information (peripheral ZT addition request information) including its own base station information. Send.

  In step S208, the base station 102 stores the base station information regarding the base station 104 included in the received peripheral zone table addition request information in the peripheral zone table of the own station.

(Second peripheral zone table update process when location registration area is changed)
The operation of the second peripheral zone table update process will be described with reference to FIG. Here, in the first peripheral zone table update process described above, the case where the connection history storage unit 3015 of the centralized control station 301 includes the location registration area history table T32 and the location registration area table T33 has been described as an example. In the example, the operation of the second peripheral zone table update process will be described by taking as an example a case where the connection history storage unit 1015 of the base stations 101 to 104 includes the location registration area history table T32 and the location registration area table T33. In this example, the neighboring base station searching unit 1017 of the base stations 101 to 104 further has the function of the neighboring base station searching unit 3016 of the centralized control station 301.

  In this example, the mobile communication system 1 performs the location registration change process for changing the location registration area of the mobile station 501, but since it is a conventional technique, the description thereof is omitted. Also, the operations in steps S211 to S212 shown in FIG. 14 are the same as the operations in steps S201 to S202 of the first peripheral zone table update process, and thus the description thereof is omitted.

  In step S213, the base station 104 receives the location registration request information transmitted from the mobile station 501. In the base station 104, the neighboring base station searching unit (the same function unit as the neighboring base station searching unit 1017) refers to the location registration area history table T32 and based on the mobile station ID included in the received location registration request information. Thus, the original location registration area ID (for example, P401) is specified. Then, the neighboring base station search unit identifies the base station ID (B101 to B102) associated with the identified location registration area ID with reference to the location registration area table T33. In the base station 104, whether or not the peripheral zone table management unit (the same function unit as the peripheral zone table management unit 1018) stores the specified base station ID (B101 to B102) in the peripheral zone table T14. A base station (for example, base station 102) having a base station ID that is not determined and stored is determined.

  In step S214, in the base station 104, the peripheral zone table management unit transmits the base station information of the own station to the base station (for example, the base station 102) having the base station ID determined not to be stored in the peripheral zone table T14. Including peripheral zone table addition request information (peripheral ZT addition request information) is transmitted.

  In step S215, the base station 102 stores the base station information regarding the base station 104 included in the received peripheral zone table addition request information in the peripheral zone table of the own station.

  In step S216, the base station 102 transmits peripheral zone table addition response information (peripheral ZT addition response information) including the base station information of the own station to the base station 104 that has transmitted the peripheral zone table addition request information.

  In step S217, the base station 104 stores the base station information related to the base station 102 included in the received peripheral zone table addition response information in the peripheral zone table of the own station.

(Third peripheral zone table update process at the time of communication reconnection request)
The operation of the third peripheral zone table update process will be described with reference to FIG. In the first to second peripheral zone table update processes described above, the mobile station 501 has changed the location registration area as an example. However, in this example, the mobile station 502 is disconnected and the mobile station 501 A description will be given of the peripheral zone table update process 502 when a reconnection request is made.

  In step S301 shown in FIG. 15, when the scrambling code of the base station 104 (first base station) is not included in the information of the peripheral zone table broadcast from the base station 103, the mobile station 502, for example, If the mobile station moves to the cell C104 formed by the base station 104 during the communication with the station 103, the handover to the base station 104 cannot be performed and the communication with the base station 103 is disconnected.

  In step S <b> 302, the mobile station 502 receives the control channel transmitted from the base station 104 and transmits reconnection request information to the base station 104. Further, the base station 104 receives the reconnection request information transmitted from the mobile station 502.

  In step S303, the base station 104 transmits communication disconnection source inquiry information including the mobile station ID (U502) of the mobile station 502 to the base stations 101 to 103 (second base station). At this time, the transmission destination of the communication disconnection source inquiry information may be all the base stations 101 to 103 accommodated in the central control station 301, or may be the base stations 101 to 102 accommodated in the control router 201. . Further, the transmission destination may be determined by inquiring the centralized control station 301 about the location registration area where the mobile station 502 was previously located.

  In addition, the base stations 101 to 103 receive communication disconnection source inquiry information. In addition, the base stations 101 to 103 that have received the communication disconnection source inquiry information determine whether or not the mobile station ID included in the communication disconnection source inquiry information is stored in the communication disconnection history table T101 of the local station.

  In step S304, for example, when the base station 103 determines that the mobile station ID included in the received communication disconnection source inquiry information is stored in the communication disconnection history table T101 of the own station, the base station 103 Communication disconnection source response information including the base station information of the station is generated and transmitted to the base station 104.

  In step S305, the base station 104 receives communication disconnection source response information.

  In step S306, the base station 104 stores the base station information included in the received communication disconnection source response information in the peripheral zone table T14 of the own station.

  In step S307, the base station 104 transmits the peripheral zone table addition request information (peripheral ZT addition request information) including the base station information of the own station to the base station 103.

  In step S308, the base station 103 stores the base station information of the base station 104 included in the received peripheral zone table addition request information in the peripheral zone table T13 of the own station.

(Fourth peripheral zone table update process at the time of communication reconnection request)
The operation of the fourth peripheral zone table update process will be described with reference to FIG. Here, in the third peripheral zone table update process described above, the case where the connection history storage unit 1015 of the base stations 101 to 104 includes the communication disconnection history table T101 has been described as an example, but in this example, the central control station The operation of the fourth peripheral zone table update process will be described by taking as an example a case where the 301 connection history storage unit 1015 includes a communication disconnection history table T101. In this example, the peripheral base station search unit 3016 of the central control station 301 further has the function of the peripheral base station search unit 1017 of the base stations 101 to 104.

  Also, the operations from step S311 to step S312 shown in FIG. 16 are the same as the operations from step S301 to step S302 of the third peripheral zone table update process, and thus description thereof is omitted.

  In step S313, the base station 104 receives the reconnection request information transmitted from the mobile station 502, and transmits communication disconnection source inquiry information including the mobile station ID (U502) of the mobile station 502 to the centralized control station 301. . In the central control station 301, the receiving unit 3011 receives communication disconnection source inquiry information.

  In step S314, the centralized control station 301 determines whether or not the mobile station ID included in the received communication disconnection source inquiry information is stored in the communication disconnection history table T101.

  If the centralized control station 301 determines that such mobile station ID is stored in the communication disconnection history table T101, the neighboring base station search unit 3016 refers to the location registration area history table T32 and refers to the mobile station. Based on the ID, a location registration area ID (for example, P402) is specified. Subsequently, the neighboring base station search unit 3016 refers to the location registration area table T33 and identifies the base station ID (B103) associated with the identified location registration area ID.

  In step S315, in the central control station 301, the neighboring base station search unit 3016 generates communication disconnection source response information including the identified base station ID (B103) and transmits the communication disconnection source response information to the base station 104.

  Further, the subsequent operations from step S316 to step S318 are the same as the operations from step S306 to step S308 in the third peripheral zone table update process, and thus description thereof is omitted.

  In the present embodiment, the operation of the peripheral zone table update processing has been described by taking the case where the event information transmitted from the mobile stations 501 to 502 is received by the newly installed base station 104 as an example. Even if the received information is received by the existing base stations 101 to 103, the above-described peripheral zone table update process can be performed.

(Operation and effect of mobile communication system)
According to the mobile communication system 1 according to the present embodiment, a base station (for example, the base station 104) uses location registration request information or reconnection request information as event information to be transmitted when the mobile stations 501 to 502 move. When receiving, base station information regarding other base stations (for example, base station 103) previously communicated with the mobile stations 501 to 502 is transmitted to other base stations (for example, base station 103) or centralized control station 301. At the same time, the base station information of another base station (for example, the base station 103) is received and stored in the peripheral zone table T14 of the own station.

  Therefore, according to the mobile communication system 1, based on the actual radio range received by the mobile station, other base stations (cells) adjacent to the own station (cell) can be identified with high accuracy and positioned in the vicinity. The base station information (parameters for wireless communication) related to other base stations to be stored can be stored in the peripheral zone table T14 of the own station.

  In addition, since the base station information of the local station is transmitted to other base stations (for example, the base station 103) stored in the peripheral zone table T14, the base station information of the local station is also stored in the other base stations 103. It becomes possible to make it. In addition, since the work stored in the peripheral zone table T14 is automatically performed with high accuracy, it is possible to reduce the work load at the time of newly installing a base station, in particular, the work that is frequently stored in the storage unit.

  Therefore, according to the mobile communication system 1, in the base station, the radio communication parameter information (scramble code, etc.) broadcast by the own station can be set with high accuracy and the workload during the setting can be reduced. Can do.

  Further, according to the mobile communication system 1, the central control station 301 allocates a new location registration area (location registration area 499) to the base station (for example, the base station 104) that transmitted the area allocation request information. Therefore, more location registration request information transmitted when the mobile station moves to the cell C104 of the base station 104 can be used as event information, and the frequency of performing the peripheral zone table update process can be increased.

  Therefore, according to the mobile communication system 1, for example, base station information can be stored earlier in a peripheral zone table provided in a specific base station such as a newly established base station.

(Other embodiments)
As described above, an example of the present invention has been described. However, the present invention is merely illustrated as a specific example, and the present invention is not particularly limited. The specific configuration and the like of each part can be appropriately changed in design. In addition, the configurations of the embodiments and the modified examples can be combined. In addition, the operation and effect of each embodiment and each modification are merely a list of the most preferable operations and effects resulting from the present invention, and the operation and effect according to the present invention are described in each embodiment and each modification. It is not limited to the ones.

It is the schematic which shows the structure of the mobile communication system which concerns on 1st Embodiment. (A) It is a figure which shows the surrounding zone table which concerns on 1st Embodiment. (B) It is a figure which shows the surrounding zone table which concerns on 1st Embodiment. FIG. 2 is a schematic diagram illustrating a configuration when a base station 104 is newly installed in the mobile communication system according to the first embodiment. (A) It is a figure which shows the surrounding zone table which concerns on 1st Embodiment. (B) It is a figure which shows the surrounding zone table which concerns on 1st Embodiment. (C) It is a figure which shows the surrounding zone table which concerns on 1st Embodiment. It is a block diagram which shows the structure of the base station which concerns on 1st Embodiment. It is a figure which shows the communication disconnection history table in the mobile communication system which concerns on 1st Embodiment. It is a block diagram which shows the structure of the control router in the mobile communication system which concerns on 1st Embodiment. It is a block diagram which shows the structure of the centralized control station in the mobile communication system which concerns on 1st Embodiment. It is a figure which shows the radio | wireless parameter table in the mobile communication system which concerns on 1st Embodiment. (A) It is a figure which shows the position registration area log | history table in the mobile communication system which concerns on 1st Embodiment. (B) It is a figure which shows the position registration area table in the mobile communication system which concerns on 1st Embodiment. It is a block diagram which shows the structure of the mobile station in the mobile communication system which concerns on 1st Embodiment. It is a sequence diagram which shows the operation | movement of the location registration area setting process in the mobile communication system which concerns on 1st Embodiment. It is a sequence diagram which shows operation | movement of the 1st periphery zone table update process in the mobile communication system which concerns on 1st Embodiment. It is a sequence diagram which shows the operation | movement of the 2nd periphery zone table update process in the mobile communication system which concerns on 1st Embodiment. It is a sequence diagram which shows the operation | movement of the 3rd periphery zone table update process in the mobile communication system which concerns on 1st Embodiment. It is a sequence diagram which shows the operation | movement of the 4th periphery zone table update process in the mobile communication system which concerns on 1st Embodiment.

Explanation of symbols

A to H ... step, B101 to B104 ... base station ID, C101 to C104 ... cell, S101 to S107 ... step, S201 to S208 ... step, S211 to S217 ... step, S301 to S308 ... step, S311 to S318 ... step, T101 ... Communication disconnection history table, T11 to T14 ... Peripheral zone table, T31 ... Wireless parameter table, T32 ... Location registration area history table, T33 ... Location registration area table, 1 to 8 ... Step, 1 ... Mobile communication system, 101 to 104 ... base station, 201 to 202 ... control router, 301 ... centralized control station, 401 to 402 ... location registration area, 499 ... location registration area, 501 to 502 ... mobile station, 1011 ... reception unit, 1012 ... transmission unit, 1013 ... Area allocation Demand section, 1014 ... area setting section, 1015 ... connection history storage section, 1016 ... peripheral zone table storage section, 1017 ... peripheral base station search section, 1018 ... peripheral zone table management section, 1019 ... control section, 2011 ... reception section, 2012 ... Transmission unit, 2013 ... Control unit, 3011 ... Reception unit, 3012 ... Transmission unit, 3013 ... Area allocation unit, 3014 ... Base station setting storage unit, 3015 ... Connection history storage unit, 3016 ... Neighboring base station search unit, 5011 ... Reception unit, 5012 ... Transmission unit, 5013 ... Location registration area change detection unit, 5014 ... Communication disconnection detection unit, 5015 ... Control unit

Claims (9)

Arranged in a mobile communication system comprising a plurality of base stations that wirelessly communicate with a mobile station and a control station that is above the plurality of base stations, the base station comprising:
A first receiver for receiving event information to be transmitted when the mobile station moves;
A base station that includes a base station ID for identifying another base station that has previously communicated with the mobile station that has transmitted the event information, and parameter information for wireless communication set in the other base station A first transmission unit for transmitting request information for requesting information to the other base station or the control station;
A second receiver for receiving the base station information transmitted from the other base station or the control station;
A management unit that stores the received base station information in a storage unit when the base station information is received;
A base station, comprising: a second transmitter that transmits base station information of the local station to the other base station stored in the storage unit.   The base station according to claim 1, wherein the event information is location registration request information for requesting a change of a location registration area indicating a location where the mobile station exists.   The event information is reconnection request information transmitted from the mobile station to request communication reconnection when communication between the other base station and the mobile station is disconnected. The base station according to claim 1, wherein:   The base station according to claim 1, wherein the management unit stores only the base station information that is not stored in the storage unit when the base unit information is stored in the storage unit. The request information includes a mobile station ID that identifies the mobile station that transmitted the event information,
A third receiver for receiving request information transmitted from another base station;
Based on the mobile station ID included in the received request information, a determination unit that determines whether the local station has previously communicated with the mobile station that transmitted the event information;
And a third transmission unit that transmits base station information of the local station to the other base station that has transmitted the request information when the determination unit determines that communication has been performed before. Item 4. The base station according to Item 1. A control station having a plurality of base stations that communicate wirelessly with a mobile station at a lower level,
A storage unit for storing base station information including a base station ID for identifying the base station and parameter information for wireless communication set in the base station;
A first receiver that receives request information for requesting the base station information of the base station that has previously communicated with the mobile station, from the base station that has received event information to be transmitted when the mobile station has moved;
Based on the base station information stored in the storage unit, to the base station that transmitted the request information, a transmission unit that transmits the base station information of the base station previously communicated with the mobile station; A control station comprising: An area storage unit for storing a location registration area for managing the location where the mobile station exists and the base station;
A second receiving unit that receives area allocation request information for requesting allocation of a new location registration area from the base station;
An area setting unit that stores the new location registration area and the base station that transmitted the area allocation request information on a one-to-one basis when the area allocation request information is received, and stores the area in the area storage unit; The control station according to claim 6. A communication method in a mobile communication system comprising a plurality of base stations that communicate wirelessly with a mobile station, and a control station that is above the plurality of base stations,
The control station stores base station information including a base station ID for identifying the base station and parameter information for wireless communication set in the base station;
The base station receiving event information transmitted when the mobile station moves; and
A base station ID for identifying another base station that has previously communicated with the mobile station that has transmitted the event information; and parameter information for wireless communication set in the other base station; Transmitting request information for requesting base station information including: to the control station;
The control station receives request information for requesting the base station information of the base station that has previously communicated with the mobile station from the base station that has received event information transmitted when the mobile station moves. When,
The control station transmits the base station information of the base station that has previously communicated with the mobile station to the base station that has transmitted the request information based on the stored base station information. When,
The base station receiving the base station information transmitted from the control station;
When the base station receives the base station information, storing the received base station information;
The base station comprises a step of transmitting the base station information of the own station to another base station corresponding to the stored base station information. A communication method in a mobile communication system comprising a plurality of base stations for wireless communication with a mobile station,
A first base station receiving event information transmitted when the mobile station moves; and
A base station ID for identifying a base station previously communicated with the mobile station from which the first base station has transmitted the event information; and parameter information for radio communication set in the base station; Including the mobile station ID for identifying the mobile station that transmitted the event information in the request information for requesting the base station information including: transmitting to the second base station;
The second base station determines, based on a mobile station ID included in the received request information, whether or not the second base station has previously communicated with the mobile station that transmitted the event information. When,
If the second base station determines that it has previously communicated in step 4, transmitting its own base station information to the first base station that transmitted the request information;
The first base station storing the received base station information in a storage unit;
The first base station includes a step of transmitting base station information of the local station to the second base station stored in the storage unit.

Images