JP2012238918A - Mobile communication method and radio base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain transfer of "SPID" which cannot be interpreted by a handover-destination radio base station T-eNB.SOLUTION: A mobile communication method includes the steps of: a radio base station eNB#1 determining whether the Serving PLMN of a mobile station UE changes or not after completion of a handover procedure for the mobile station UE from a cell #1 subordinate to a radio base station eNB#1 to a cell #2 subordinate to a radio base station eNB#2; and the radio base station eNB#1 not notifying the radio base station eNB#2 of SPID if it has detected that the Serving PLMN of the mobile station UE changes.

Description

  The present invention relates to a mobile communication method and a radio base station.

  In the LTE (Long Term Evolution) scheme, in the S1 handover procedure and the X2 handover procedure, the handover source radio base station S-eNB sends “SPID (Subscriber Profile ID for RAT / Frequency) to the handover destination radio base station T-eNB. Priority) ”is transferred.

  Note that “SPID” is a name in the RAN specification in 3GPP, and in the SA specification in 3GPP, it is called “RFSP index (RAT / Frequency Selection Priority index)”.

  “SPID” defines the priority used when the mobile station UE in the “RRC_Connected state” or the “Idle state” selects a radio access scheme (RAT / frequency).

  256 values from “1” to “256” can be set in “SPID”, “1” to “128” are values that can be freely set by the operator, and “129” to “256” are It is a “well known value” defined by the 3GPP specifications.

  As shown in FIG. 9, priorities in the case of “SPID = 254”, “SPID = 255”, and “SPID = 256” are defined.

3GPP TS36.300

  However, the rule for transferring “SPID” from the handover source radio base station S-eNB to the handover destination radio base station T-eNB is that handover between radio base stations eNB provided by the same PLMN (Public Land Mobile Network) is performed. Assumed.

  Therefore, when the PLMN changes due to the S1 handover or the X2 handover, the handover destination radio base station T-eNB can grasp the priority defined by the “SPID” transferred from the handover source radio base station S-eNB. There was a problem that it was not possible.

  In particular, as shown in FIG. 10, when the PLMN changes due to S1 handover or X2 handover (for example, PLMN # A → PLMN # B), the handover destination radio base station T-eNB is a value other than “well known value”. That is, there is a problem that it is impossible to grasp the priority defined by “SPID” in which a value (for example, “50”) in which PLMN # A uniquely sets the priority is set.

  Therefore, the handover destination radio base station T-eNB transmits the “Tracking Area Update Accept” in the TAU (Tracking Area Update) procedure by the “S1 Downlink NAS Transport” from the mobility management node MME (Mobility Management Entity ID) “Mobile Management Node”. In the meantime, there is a problem that control according to the priority defined by “SPID” cannot be performed.

  Therefore, the present invention has been made in view of the above-described problems, and a mobile communication method and a radio base that can suppress transfer of “SPID” that cannot be grasped by a handover destination radio base station T-eNB. The purpose is to provide a station.

  A first feature of the present invention is a mobile communication method, in which a first radio base station has completed a handover procedure from a cell under the first radio base station to a cell under the second radio base station. After determining whether or not the serving PLMN of the mobile station changes, and when the first radio base station detects that the serving PLMN of the mobile station changes, the second radio base station And a step of not reporting the predetermined information that defines the priority used when the mobile station selects a radio access method.

  A second feature of the present invention is a mobile communication method, in which a first radio base station has completed a handover procedure from a cell under the first radio base station to a cell under the second radio base station. A step of determining whether the serving PLMN of the mobile station is changed later, and when the first radio base station detects that the serving PLMN of the mobile station is changed, and the mobile station A step of notifying the second radio base station of the predetermined information when a value within a predetermined range is defined as the predetermined information defining the priority used when selecting the method; and When the radio base station detects that the serving PLMN of the mobile station changes, and when the value within the predetermined range is not defined as the predetermined information, the second radio base station, And summarized in that a step of not reporting predetermined information.

  A third feature of the present invention is a mobile communication method, in which a first radio base station has completed a handover procedure from a cell under the first radio base station to a cell under the second radio base station. A step of determining whether the serving PLMN of the mobile station is changed later, and when the first radio base station detects that the serving PLMN of the mobile station is changed, and the mobile station A step of notifying the second radio base station of the predetermined information when a value within a predetermined range is defined as the predetermined information defining the priority used when selecting the method; and If the radio base station detects that the serving PLMN of the mobile station changes, and if a value within the predetermined range is not specified as the predetermined information, it is specified as the predetermined information. Change the value to a value within the predetermined range, and summarized in that a step of notifying to the second radio base station.

  A fourth feature of the present invention is a radio base station, wherein after a handover procedure from a cell under the radio base station of a mobile station to a cell under another radio base station is completed, the serving PLMN of the mobile station When it is detected that the determination unit configured to determine whether or not to change and the serving PLMN of the mobile station change, the mobile station selects a radio access method for the other radio base station And a transmission unit configured not to notify the predetermined information that defines the priority used in the process.

  A fifth feature of the present invention is a radio base station, wherein after a handover procedure from a cell under the radio base station of the mobile station to a cell under another radio base station is completed, the serving PLMN of the mobile station A determination unit configured to determine whether or not to change, and a priority used when the mobile station's serving PLMN is detected to change and when the mobile station selects a radio access scheme A transmission unit configured to notify the other radio base station of the predetermined information when a value within a predetermined range is defined as the predetermined information that defines When it is detected that the serving PLMN of the mobile station is changed, and the value within the predetermined range is not defined as the predetermined information, the transmitting unit communicates with the other radio base station. Te, and gist that it is configured not to notify the predetermined information.

  A sixth feature of the present invention is a radio base station, wherein after a handover procedure from a cell under the radio base station of a mobile station to a cell under another radio base station is completed, the serving PLMN of the mobile station A determination unit configured to determine whether or not to change, and a priority used when the mobile station's serving PLMN is detected to change and when the mobile station selects a radio access scheme A transmission unit configured to notify the other radio base station of the predetermined information when a value within a predetermined range is defined as the predetermined information that defines When it is detected that the serving PLMN of the mobile station is changed, and the value within the predetermined range is not specified as the predetermined information, the transmission unit is specified as the predetermined information. And by changing the value to a value within the predetermined range is, and summarized in that is configured to notify the different radio base station.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a radio base station that can suppress transfer of “SPID” that cannot be grasped by the handover destination radio base station T-eNB. it can.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a figure for demonstrating an example of the method of detecting the change of Serving-PLMN in the wireless base station which concerns on the 1st Embodiment of this invention. It is a figure shown about the format example of "X2 Handover Request" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure shown about the example of a format of "Source eNB to Target eNB transparent container" used with the mobile communication system which concerns on the 1st Embodiment of this invention. 5 is a flowchart showing an operation of the radio base station according to the first embodiment of the present invention. It is a flowchart which shows operation | movement of the wireless base station which concerns on the modification 1 of this invention. It is a functional block diagram of the wireless base station which concerns on the modification 2 of this invention. It is a figure for demonstrating "SPID" prescribed | regulated with the conventional mobile communication system. It is a figure for demonstrating the conventional mobile communication system.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 6, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the mobile communication system according to the present embodiment is an LTE mobile communication system that manages a radio base station eNB # 1 that manages a cell # 1 and a cell # 2. Wireless base station eNB # 2.

  The radio base station eNB # 1 broadcasts “PLMN List” including “PLMN # 1” as “Primary PLMN” in a subordinate cell (for example, cell # 1), and the radio base station eNB # 2 In a subordinate cell (for example, cell # 2), “PLMN List” including “PLMN # 2” is broadcast as “Primary PLMN”.

  Also, the radio base station eNB # 1 sets “SPID = 50” and “SPID = 60” in the PLMN # 1, and the radio base station eNB # 2 sets “SPID = 1” and “SPID #” in the PLMN # 2. “SPID = 2” is set.

  As illustrated in FIG. 2, the radio base station eNB # 1 according to the present embodiment includes a management unit 11, a reception unit 12, a determination unit 13, and a transmission unit 14.

  The management unit 11 is configured to manage “SPID” set in each PLMN.

  The management unit 11 is configured to manage the PLMN that can be provided in the subordinate cell.

  The receiving unit 12 is configured to receive various signals transmitted by the mobile station UE in the subordinate cell and the adjacent radio base station eNB (for example, the radio base station eNB # 2).

  Moreover, the receiving part 12 is comprised so that the alerting | reporting signal alert | reported by the adjacent radio base station eNB (for example, radio base station eNB # 2) may be received.

  Here, the receiving unit 12 may be configured to acquire “PLMN List” broadcasted in the cell # 2 from the adjacent radio base station eNB via the X2 interface, You may be comprised so that "PLMN List" alert | reported in cell # 2 may be acquired from the alerting | reporting signal alert | reported by the base station eNB.

  The determination unit 13 determines whether or not the “serving PLMN (serving PLMN)” of the mobile station UE changes after the handover procedure (S1 handover procedure or X2 handover procedure) from the cell # 1 to the cell # 2 of the mobile station UE is completed. It is comprised so that it may determine about.

  For example, as illustrated in FIG. 3, the determination unit 13 performs “PLMN List” broadcast in the handover destination candidate cell # 2 reported from the mobile station UE in “Measurement Report” and the mobile station UE in the cell # 1. By comparing with “Serving PLMN”, it is configured to determine whether or not “Serving PLMN” of the mobile station UE changes.

  Here, as illustrated in FIG. 3A, the determination unit 13 includes the “PLMN List (PLMN # 1 to # 3)” broadcasted in the cell # 2 in the “PLMN List (PLMN # 1 to # 3)”. When “Serving PLMN (PLMN # 1)” is included, it is configured to determine that “Serving PLMN” of the mobile station UE does not change.

  Note that, as illustrated in FIG. 3A, the determination unit 13 includes the “Serving PLMN (PLMN # 1)” of the mobile station UE in the cell # 1 in the “PLMN List” broadcast in the cell # 2. Even if it is not included as “Primary PLMN”, it may be configured to determine that “Serving PLMN” of the mobile station UE does not change.

  On the other hand, as illustrated in FIG. 3B, the determination unit 13 includes “Serving” of the mobile station UE in the cell # 1 in “PLMN List (PLMN # 1 to # 3)” broadcasted in the cell # 2. When “PLMN (PLMN # 1)” is not included, it is configured to determine that “Serving PLMN” of the mobile station UE changes.

  In such a case, as illustrated in FIG. 3B, the determination unit 13 determines “HO Restriction” of the mobile station UE among “PLMN List (PLMN # 2 to # 4)” broadcasted in the cell # 2. “PLMN # 2” set as “Equivalent PLMN” in “List” may be determined to be “Serving PLMN” of the mobile station UE in cell # 2.

  The transmission unit 14 is configured to transmit various signals to the mobile station UE in the subordinate cell and the adjacent radio base station eNB (for example, the radio base station eNB # 2).

  Here, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE does not change after the handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, the transmission unit 14 The station eNB # 2 is configured to notify the “SPID” set in the PLMN # 1.

  For example, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE does not change after the X2 handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, the transmission unit 14 As shown in FIG. 4, the information element “Subscriber Profile ID for RAT / Frequency priority” in “X2 Handover Request” transmitted to the radio base station eNB # 2 is set to “SPID” set in PLMN # 1. (See 3GPP TS36.423).

  Alternatively, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE does not change after the S1 handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, the transmission unit 14 As shown in FIG. 4, the information element “Subscriber Profile ID for RAT / Frequency priority” in “Source eNB to Target eNB transparent container” transmitted to the mobility management node MME is set in “PLMN # 1” (Refer to TS36.413 of 3GPP).

  On the other hand, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE changes after the handover procedure from the cell # 1 of the mobile station UE to the cell # 2 is completed, the radio base station eNB # 2 The “SPID” set in the PLMN # 1 is not notified.

  For example, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE does not change after the X2 handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, the transmission unit 14 As shown in FIG. 4, the information element “Subscriber Profile ID for RAT / Frequency priority” in “X2 Handover Request” transmitted to the radio base station eNB # 2 is set to “SPID” set in PLMN # 1. (Refer to TS36.423 of 3GPP).

  Alternatively, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE does not change after the S1 handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, the transmission unit 14 As shown in FIG. 4, the information element “Subscriber Profile ID for RAT / Frequency priority” in “Source eNB to Target eNB transparent container” transmitted to the mobility management node MME is set in “PLMN # 1” Is not set (refer to 3GPP TS36.413).

  Hereinafter, an example of the operation of the radio base station eNB # 1 according to the first embodiment of the present invention will be described with reference to FIG.

  As illustrated in FIG. 6, in step S101, the radio base station eNB # 1 completes the handover procedure (S1 handover procedure or X2 handover procedure) from the cell # 1 to the cell # 2 of the mobile station UE. It is determined whether or not “Serving PLMN” changes.

  If “YES”, the operation proceeds to step S102, and if “NO”, the operation proceeds to step S103.

  In step S102, the radio base station eNB # 1 does not transfer the “SPID” set in the PLMN # 1 to the radio base station eNB # 2.

  On the other hand, in step S103, the radio base station eNB # 1 transfers “SPID” set in the PLMN # 1 to the radio base station eNB # 2.

  According to the mobile communication system according to the first embodiment of the present invention, the radio base station eNB # 1 completes the handover procedure (S1 handover procedure or X2 handover procedure) from the cell # 1 to the cell # 2 of the mobile station UE. After that, when it is determined that the “Serving PLMN” of the mobile station UE changes, the “SPID” set in the PLMN # 1 provided in the cell # 1 is not transferred to the radio base station eNB # 2. Therefore, it is possible to avoid useless transfer of “SPID” that cannot be grasped by the radio base station eNB # 2.

(Modification 1)
With reference to FIG. 7, a mobile communication system according to Modification 1 of the first embodiment of the present invention will be described. Hereinafter, the mobile communication system according to the first modification will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  In the mobile communication system according to the first modification, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE changes after the handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed. Even in the case where “well known value (129-256)” is defined as “SPID” in PLMN # 1, the transmitter 14 is set in the PLMN # 1 for the radio base station eNB # 2. The “SPID” is notified.

  On the other hand, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE changes after the handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, and the “SPID” in the PLMN # 1 When a value other than “well known value (129 to 256)” is defined as “SPID” set in PLMN # 1 for the radio base station eNB # 2 It is configured not to notify.

  Alternatively, when the determination unit 13 determines that the “Serving PLMN” of the mobile station UE changes after the handover procedure from the cell # 1 to the cell # 2 of the mobile station UE is completed, and the “SPID” in the PLMN # 1 When a value other than “well known value (129 to 256)” is defined as “Well known value (129 to 256)”, the transmitting unit 14 changes the value defined as the “SPID” to “well known value (129 to 256)” And may be configured to notify the radio base station eNB # 2.

  Hereinafter, an example of the operation of the radio base station eNB # 1 according to the first modification will be described with reference to FIG.

  As shown in FIG. 7, in step S201, the radio base station eNB # 1 completes the handover procedure (S1 handover procedure or X2 handover procedure) from the cell # 1 to the cell # 2 of the mobile station UE. It is determined whether or not “Serving PLMN” changes.

  If “YES”, the operation proceeds to step S202. If “NO”, the operation proceeds to step S204.

  In step S202, the radio base station eNB # 1 determines whether or not “well known value (129 to 256)” is set as “SPID” in the PLMN # 1.

  If “NO”, the operation proceeds to step S203, and if “YES”, the operation proceeds to step S204.

  In step S203, the radio base station eNB # 1 is configured not to notify the radio base station eNB # 2 of the “SPID” set in the PLMN # 1.

  Or radio base station eNB # 1 changes the value prescribed | regulated as this "SPID" to "well known value (129-256)", and notifies with respect to radio base station eNB # 2.

  On the other hand, in step S204, the radio base station eNB # 1 directly transfers the “SPID” set in the PLMN # 1 to the radio base station eNB # 2.

  According to the mobile communication system according to the second embodiment of the present invention, the radio base station eNB # 1 completes the handover procedure (S1 handover procedure or X2 handover procedure) from the cell # 1 to the cell # 2 of the mobile station UE. After that, when it is determined that the “Serving PLMN” of the mobile station UE is changed, and a value other than “well known value (129 to 256)” is defined as “SPID” in PLMN # 1. The wireless base station eNB # 2 knows that the wireless base station eNB # 2 is configured not to transfer the “PSID” set in the PLMN # 1 provided in the cell # 1 to the wireless base station eNB # 2. It is possible to avoid useless transfer of “SPID” that cannot be performed.

  Alternatively, according to the mobile communication system according to the second embodiment of the present invention, the radio base station eNB # 1 performs a handover procedure (S1 handover procedure or X2 handover procedure) from the cell # 1 to the cell # 2 of the mobile station UE. When it is determined that the “Serving PLMN” of the mobile station UE changes after the completion of the process, and a value other than “well known value (129 to 256)” is defined as “SPID” in PLMN # 1 Is configured to change the value defined as such “SPID” to “well known value (129-256)” and transfer the value to the radio base station eNB # 2. The station eNB # 2 can grasp the priority defined by the transferred “SPID”.

(Modification 2)
With reference to FIG. 8, a mobile communication system according to Modification 2 of the first embodiment of the present invention will be described. Hereinafter, the mobile communication system according to the second modification will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  As illustrated in FIG. 8, the radio base station eNB # 2 according to the second modification includes a reception unit 21 and a management unit 22.

  The receiving unit 21 is configured to receive various signals transmitted by the mobile station UE in the subordinate cell and the adjacent radio base station eNB (for example, the radio base station eNB # 1).

  Here, the receiving unit 21 is configured to acquire “SPID” set in the PLMN # 1 through the X2 interface in the X2 handover procedure from the cell # 1 to the cell # 2 of the mobile station UE. May be.

  Alternatively, the reception unit 21 is configured to acquire “SPID” set in the PLMN # 1 via the S1 interface in the S1 handover procedure from the cell # 1 to the cell # 2 of the mobile station UE. Also good.

  The management unit 22 is configured to manage “SPID” set in each PLMN.

  The management unit 22 is configured to manage the PLMN that can be provided in the subordinate cell.

  Here, when “1” to “128” are set in the “SPID” acquired by the receiving unit 21, the management unit 22 sets the “SPID” set in the radio base station eNB # 2. Either one is configured to be managed as “SPID” used by the mobile station UE in the cell # 2.

  Alternatively, even when “129” to “256” are set in the “SPID” acquired by the receiving unit 21, the management unit 22 recognizes the “SPID” by the radio base station eNB # 2. When it is not possible, it is configured to manage any of “SPID” set in the radio base station eNB # 2 as “SPID” used by the mobile station UE in the cell # 2.

  In addition, when “1” to “128” are set in “SPID” acquired by the receiving unit 21, the management unit 22 ignores the “SPID” and performs the mobile station UE in the cell # 2. May be configured to determine the “SPID” used.

  Further, even when “129” to “256” are set in the “SPID” acquired by the receiving unit 21, the management unit 22 recognizes the “SPID” by the radio base station eNB # 2. When this is not possible, the “SPID” may be ignored and the “SPID” used by the mobile station UE in the cell # 2 may be determined.

  According to the mobile communication system according to the second modification of the present invention, the radio base station eNB # 2 uses the “SPID” used by the mobile station UE in the cell # 2 based on the “SPID” received from the radio base station eNB # 1. "Cannot be determined" can be avoided.

  The characteristics of the present embodiment described above may be expressed as follows.

  The first feature of the present embodiment is a mobile communication method, in which a radio base station eNB # 1 (first radio base station) starts a radio base station from a cell # 1 under the radio base station eNB # 1 of the mobile station UE. A step of determining whether or not the “serving PLMN (serving PLMN)” of the mobile station UE changes after the handover procedure for the cell # 2 under the station eNB # 2 (second radio base station) is completed, and the radio base station When the eNB # 1 detects that the “Serving PLMN” of the mobile station UE is changed, the eNB # 1 gives the “SPID (priority used when the mobile station UE selects a radio access scheme) to the radio base station eNB # 2. The predetermined information) is not notified.

  A second feature of the present embodiment is a mobile communication method, in which the radio base station eNB # 1 changes from a cell # 1 under the radio base station eNB # 1 of the mobile station UE to a cell under the radio base station eNB # 2. After the handover procedure for # 2 is completed, the step of determining whether or not the “Serving PLMN” of the mobile station UE changes, and the radio base station eNB # 1 detects that the “Serving PLMN” of the mobile station UE changes. If “well known value (129 to 256) (value within a predetermined range)” is defined as “SPID”, the radio base station eNB # 2 is notified of the “SPID”. And when the radio base station eNB # 1 detects that the “Serving PLMN” of the mobile station UE changes, and as “SPID” When “well known value (129-256)” is not defined, the gist is to include a step of not notifying the radio base station eNB # 2 of the “SPID”.

  A third feature of the present embodiment is a mobile communication method, in which the radio base station eNB # 1 changes from a cell # 1 under the radio base station eNB # 1 of the mobile station UE to a cell under the radio base station eNB # 2. After the handover procedure for # 2 is completed, the step of determining whether or not the “Serving PLMN” of the mobile station UE changes, and the radio base station eNB # 1 detects that the “Serving PLMN” of the mobile station UE changes. And when “well known value (129-256)” is defined as “SPID”, a step of notifying the radio base station eNb # 2 of the “SPID”, and a radio base station When eNB # 1 detects that the “Serving PLMN” of the mobile station UE changes, and “SPID” is “well kno” When “n value (129 to 256)” is not defined, the value defined as “SPID” is changed to “well known value (129 to 256)” and the radio base station eNb # 2 is changed. And a step of notifying.

  The fourth feature of the present embodiment is the radio base station eNB # 1, which is a handover procedure from the cell # 1 under the radio base station eNB # 1 of the mobile station UE to the cell # 2 under the radio base station eNB # 2. When the determination unit 13 configured to determine whether or not the “Serving PLMN” of the mobile station UE changes after detecting is completed, the wireless base station detects that the “Serving PLMN” of the mobile station UE changes. The gist of the present invention is to include a transmitter 14 configured not to notify the station eNB # 2 of “SPID”.

  The fifth feature of the present embodiment is the radio base station eNB # 1, which is a handover procedure from the cell # 1 under the radio base station eNB # 1 of the mobile station UE to the cell # 2 under the radio base station eNB # 2. Is completed, the determination unit 13 configured to determine whether or not the “Serving PLMN” of the mobile station UE changes, and when the change of the “Serving PLMN” of the mobile station UE is detected, and , When “well known value (129-256)” is defined as “SPID”, the transmitter 14 configured to notify the radio base station eNB # 2 of the “SPID” And when detecting that the “Serving PLMN” of the mobile station UE is changed, and “SPID” is “well kn” If wn value (129~256) "is not specified, transmitter 14, and summarized in that respect radio base station eNB # 2, is configured not to notify of such" SPID ".

  The sixth feature of the present embodiment is the radio base station eNB # 1, which is a handover procedure from the cell # 1 under the radio base station eNB # 1 of the mobile station UE to the cell # 2 under the radio base station eNB # 2. Is completed, the determination unit 13 configured to determine whether or not the “Serving PLMN” of the mobile station UE changes, and when the change of the “Serving PLMN” of the mobile station UE is detected, When “well known value (129-256)” is defined as “SPID”, the transmitter 14 configured to notify the radio base station eNB # 2 of the “SPID” is provided. In the case where it is detected that the “Serving PLMN” of the mobile station UE changes and “SPID” is “well known”. When “value (129 to 256)” is not defined, the transmission unit 14 changes the value defined as “SPID” to “well known value (129 to 256)”, and the radio base station eNB # 2 It is set as the summary to notify with respect to.

  Note that the operations of the radio base stations eNB # 1 / eNB # 2 and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, or a combination of both May be implemented.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a Hard Disk, a Registered ROM, a Hard Disk Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the radio base station eNB # 1 / eNB # 2 or the mobile station UE. Further, the storage medium and the processor may be provided in the radio base station eNB # 1 / eNB # 2 or the mobile station UE as a discrete component.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station eNB # 1, eNB # 2 ... radio base station 11, 22 ... management unit 12, 21 ... reception unit 13 ... determination unit 14 ... transmission unit

Claims (6)

The first radio base station determines whether or not the serving PLMN of the mobile station changes after the handover procedure from the cell under the first radio base station of the mobile station to the cell under the second radio base station is completed. Process,
When the first radio base station detects that the serving PLMN of the mobile station changes, the priority used when the mobile station selects a radio access scheme is defined for the second radio base station And a step of not notifying the predetermined information to be performed. The first radio base station determines whether or not the serving PLMN of the mobile station changes after the handover procedure from the cell under the first radio base station of the mobile station to the cell under the second radio base station is completed. Process,
When the first radio base station detects that the serving PLMN of the mobile station changes, and the mobile station selects a radio access scheme, the predetermined information defining the priority used is within a predetermined range. If the value of is specified, the step of notifying the predetermined information to the second radio base station,
When the first radio base station detects that the serving PLMN of the mobile station changes, and when a value within the predetermined range is not defined as the predetermined information, the second radio base station And a step of not reporting the predetermined information. The first radio base station determines whether or not the serving PLMN of the mobile station changes after the handover procedure from the cell under the first radio base station of the mobile station to the cell under the second radio base station is completed. Process,
When the first radio base station detects that the serving PLMN of the mobile station changes, and the mobile station selects a radio access scheme, the predetermined information defining the priority used is within a predetermined range. If the value of is specified, the step of notifying the predetermined information to the second radio base station,
When the first radio base station detects that the serving PLMN of the mobile station changes, and when the value within the predetermined range is not specified as the predetermined information, the predetermined information is specified as the predetermined information. And a step of changing the value to a value within the predetermined range and notifying the second radio base station. A wireless base station,
A determination unit configured to determine whether a serving PLMN of the mobile station changes after a handover procedure from a cell under the radio base station of the mobile station to a cell under another radio base station is completed; ,
When it is detected that the serving PLMN of the mobile station is changed, the mobile station is not notified of predetermined information that defines the priority used when the mobile station selects a radio access method. A radio base station comprising: a configured transmission unit. A wireless base station,
A determination unit configured to determine whether a serving PLMN of the mobile station changes after a handover procedure from a cell under the radio base station of the mobile station to a cell under another radio base station is completed; ,
When it is detected that the serving PLMN of the mobile station is changed, and a value within a predetermined range is defined as predetermined information that defines a priority used when the mobile station selects a radio access method A transmission unit configured to notify the other wireless base station of the predetermined information,
When it is detected that the serving PLMN of the mobile station is changed, and when a value within the predetermined range is not defined as the predetermined information, the transmission unit transmits to the other radio base station A radio base station configured not to notify predetermined information. A wireless base station,
A determination unit configured to determine whether a serving PLMN of the mobile station changes after a handover procedure from a cell under the radio base station of the mobile station to a cell under another radio base station is completed; ,
When it is detected that the serving PLMN of the mobile station is changed, and a value within a predetermined range is defined as predetermined information that defines a priority used when the mobile station selects a radio access method A transmission unit configured to notify the other wireless base station of the predetermined information,
When it is detected that the serving PLMN of the mobile station changes, and when a value within the predetermined range is not defined as the predetermined information, the transmitting unit sets the value defined as the predetermined information as the predetermined information. A radio base station configured to change to a value within a predetermined range and notify the other radio base station.

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