JP5139574B2 - Mobile communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform an appropriate resource allocation processing in a radio base station HeNB2 when a mobile station UE performs a handover to a cell under the control of the radio base station HeNB2 operating at "Hybrid". <P>SOLUTION: The mobile station UE includes: a determining portion 13 determining whether the mobile station is a registered mobile station in the radio base station HeNB2 or not based on notification information transmitted by the radio base station HeNB2 when the cell under the control of a radio base station eNB is set to be a serving cell and a measurement report transmitting portion 14 transmitting a measurement report including prescribed information showing such a determination result to the radio base station eNB. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

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

  In a LTE (Long Term Evolution) mobile communication system defined by 3GPP, a radio base station HeNB (Home eNB) that can operate in any of “Open”, “Closed”, and “Hybrid” is provided. Can do.

  A radio base station HeNB (or cell, hereinafter the same) operating in “Open” can provide mobile communication services to both registered and unregistered mobile stations in the radio base station HeNB. It is configured as follows.

  Here, the registered mobile station in the radio base station HeNB is a mobile station UE belonging to the CSG specified by the CSG (Closed Subscriber Group) -ID of the radio base station HeNB, and the unregistered mobile station in the radio base station HeNB is It is a mobile station UE that does not belong to the CSG specified by the CSG-ID of the radio base station HeNB.

  Further, the radio base station HeNB operating in “Closed” is configured to be able to provide a mobile communication service only to registered mobile stations in the radio base station HeNB.

  Further, the radio base station HeNB (or cell) operating in “Hybrid” can provide a mobile communication service by differentiating each of a registered mobile station and an unregistered mobile station in the radio base station HeNB. It is configured to be able to.

  For example, the radio base station HeNB operating in “Hybrid” is configured to preferentially accept a communication start request from a registered mobile station and allocate resources for high-speed communication. You may comprise so that the priority of a communication start request may be lowered | hung or not received.

  Hereinafter, with reference to FIG. 6, an operation when the mobile station UE performs handover to a cell under the radio base station HeNB2 operating in “Hybrid” in the mobile communication system will be described.

  As shown in FIG. 6, in step S2001, the mobile station UE transmits a measurement report (Measurement Report) including, for example, E-CGI (EUTRAN Cell Global Identity) of the radio base station HeNB2 to the radio base station eNB. To do.

  In step S2002, the radio base station eNB transmits a handover request signal (HO REQUIRED) including identification information (HeNB-ID (E-CGI) = yyy.001) of the radio base station HeNB2 to the switching center MME. .

  In step S2003A, the switching center MME transmits a handover request signal (HO REQUEST) to the gateway device HeNB-GW. In step S2003B, the gateway device HeNB-GW sends a handover request to the radio base station HeNB2. A signal (HO REQUEST) is transmitted.

  In step S2004A, the radio base station HeNB2 transmits a handover request response signal (HO REQUEST ACK) including CSG-ID = # 31 of the radio base station HeNB2 to the gateway apparatus HeNB-GW, and in step S2004B, the gateway The device HeNB-GW transmits such a handover request response signal (HO REQUEST ACK) to the exchange MME.

  In step S2005, the mobile switching center MME receives the CSG-ID = # 31 of the radio base station HeNB2 included in the handover request response signal (HO REQUEST ACK) received from the gateway device HeNB-GW and the mobile station UE managed by itself. Based on the CSG-ID, it is determined whether the mobile station UE is a registered mobile station or a non-registered mobile station in the radio base station HeNB2.

3GPP TS36.300 3GPP TS36.331 3GPP TS 36.413

  However, in the mobile communication system described above, since the CSG-ID of the mobile station UE is not notified from the switching center MME to the radio base station HeNB2 in steps S2003A and S2003B, the radio base station HeNB2 It is not possible to determine whether the mobile station is a registered mobile station or a non-registered mobile station in the base station HeNB2, and there is a problem that an appropriate resource allocation process cannot be performed when operating in “Hybrid”. It was.

  Therefore, the present invention has been made in view of the above-described problems, and when the mobile station UE performs handover to a cell under the radio base station HeNB2 operating in “Hybrid”, the radio base station HeNB2 It is an object of the present invention to provide a mobile communication method, a mobile station, and a radio base station that can perform appropriate resource allocation processing.

  A first feature of the present invention is a mobile communication method, in which a mobile station that uses a cell under the control of a first radio base station as a serving cell is based on broadcast information transmitted by the second radio base station. Step A for determining whether or not the mobile station is a registered mobile station, and Step B for transmitting a measurement report including predetermined information indicating the determination result to the first radio base station. The first radio base station transmits a handover request signal including the predetermined information to the exchange, and the exchange transmits the predetermined information to the second radio base station. A handover request signal including the step D, and the second radio base station responding to the predetermined information included in the handover request signal received from the exchange and the access mode in the second radio base station. Te, and summarized in that a step E of performing resource allocation processing on the mobile station.

  A second feature of the present invention is a mobile station, which uses the second radio base station based on broadcast information transmitted by the second radio base station when a cell under the first radio base station is a serving cell. A determination unit configured to determine whether or not the mobile station is a registered mobile station, and a measurement report including predetermined information indicating the determination result to the first radio base station And a measurement report transmission unit.

  A third feature of the present invention is a radio base station, wherein a handover request signal including predetermined information indicating whether or not the mobile station is a registered mobile station in the radio base station is received from the exchange. The gist is provided with a configured receiving unit and an allocation processing unit configured to perform resource allocation processing for the mobile station according to the predetermined information and an access mode in the radio base station. .

  As described above, according to the present invention, there is provided a mobile communication method, a mobile station, and a radio base station that allow a mobile station UE to perform appropriate resource allocation processing in the radio HeNB 2 operating in “Hybrid”. be able to.

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 mobile station UE according to the first embodiment of the present invention. FIG. 2 is a functional block diagram of a radio base station HeNB according to the first embodiment of the present invention. It is a functional block diagram of the exchange MME which concerns on the 1st Embodiment of this invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. It is a sequence diagram which shows operation | movement of the conventional mobile communication system.

(Configuration of mobile communication system according to the first embodiment of the present invention)
The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIGS.

  The mobile communication system according to the present embodiment is an LTE mobile communication system, and as shown in FIG. 1, an exchange MME, a radio base station eNB and a radio base station HeNB1 connected to the exchange MME, The gateway device HeNB-GW connected to the exchange MME, and the radio base station HeNB2 and the radio base station HeNB3 connected to the gateway device HeNB-GW are provided.

  Here, the identification information eNB-ID (E-CGI) of the radio base station eNB is “zzz.000”, and the identification information HeNB-ID (E-CGI) of the gateway device HeNB-GW is “yyy.000”. Yes, the identification information HeNB-ID (E-CGI) of the radio base station HeNB1 is “xxx.100”, the identification information HeNB-ID (E-CGI) of the radio base station HeNB2 is “yyy.001”, The identification information HeNB-ID (E-CGI) of the radio base station HeNB3 is “yyy.002”.

  The CSG-ID of the radio base station HeNB1 is “# 22”, the CSG-ID of the radio base station HeNB2 is “# 31”, and the CSG-ID of the radio base station HeNB3 is “# 32”.

  As shown in FIG. 2, the mobile station UE includes a management unit 11, a broadcast information reception unit 12, a determination unit 13, and a measurement report transmission unit 14.

  The management unit 11 is configured to manage “Allowed CSG-ID List (that is, White List)”. Specifically, the “Allowed CSG-ID List” includes one or more CSG-IDs that specify the CSG to which the mobile station UE belongs.

  The broadcast information receiving unit 12 is configured to receive broadcast information in the serving cell and neighboring cells.

  For example, the broadcast information receiving unit 12 is configured to acquire a CSG-ID and a CSG indicator included in broadcast information transmitted by the radio base stations HeNB1 to HeNB3.

  Here, the CSG-ID included in the broadcast information is the CSG-ID of the radio base stations HeNB1 to HeNB3, and the CSG indicator included in the broadcast information indicates the access mode of the radio base stations HeNB1 to HeNB3. is there. Note that the access modes of the radio base stations HeNB1 to HeNB3 are assumed to have the three types of “Open”, “Closed”, and “Hybrid” described above.

  The determination unit 13 is configured to determine whether or not the mobile station UE is a registered mobile station in the radio base stations HeNB1 to HeNB3, based on broadcast information transmitted by the radio base stations HeNB1 to HeNB3.

  Specifically, the determination unit 13 determines whether the CSG-ID included in the broadcast information is stored in the “Allowed CSG-ID List” managed by the management unit 11. It may be configured to perform the determination.

  The measurement report transmission unit 14 measures a measurement report (Measurement Report) including predetermined information (UE Preliminary Access Check Bit) indicating a determination result by the determination unit 13 for the radio base station eNB managing the serving cell of the mobile station UE. Is configured to send.

  For example, when the determination unit 13 determines that the mobile station UE is an unregistered mobile station in the radio base stations HeNB1 to HeNB3, the measurement report transmission unit 14 sets “UE Preliminary Access Check Bit” in the measurement report to “ It may be configured to set “1” or “0”.

  As illustrated in FIG. 3, the radio base stations HeNB1 to HeNB3 (hereinafter, representatively referred to as a radio base station HeNB) or the radio base station eNB include a measurement report receiving unit 21 and a handover processing unit 22. ing.

  The measurement report receiving unit 21 of the radio base station eNB in FIG. 1 is configured to receive a measurement report received from the mobile station UE.

  Specifically, the measurement report receiving unit 21 of the radio base station eNB in FIG. 1 is configured to acquire predetermined information (UE Preliminary Access Check Bit) included in the measurement report.

  If the measurement report received from the mobile station UE includes predetermined information (UE Preliminary Access Check Bit), the handover processing unit 21 of the radio base station eNB in FIG. A handover request signal (HO REQUIRED) including a UE Preliminary Access Check Bit) is transmitted.

  The handover processing unit 21 of the radio base station HeNB in FIG. 1 receives a handover request signal (HO REQUIRED) including predetermined information (UE Preliminary Access Check Bit) from the exchange MME via the gateway device HeNB-GW as necessary. Is configured to receive.

  Then, the handover processing unit 21 of the radio base station HeNB in FIG. 1 is configured to perform resource allocation processing for the mobile station UE according to the predetermined information (UE Preliminary Access Check Bit) and the access mode in the radio base station HeNB. Has been.

  For example, the handover processing unit 21 of the radio base station HeNB in FIG. 1 indicates that the predetermined information (UE Preliminary Access Check Bit) indicates that the mobile station UE is an unregistered mobile station in the radio base station HeNB2. When the access mode in HeNB2 is "Hybrid", you may be comprised so that the resource allocation process for unregistered mobile stations may be performed with respect to the mobile station UE.

  As shown in FIG. 4, the switching center MME includes a management unit 31, a handover processing unit 32, and a determination unit 33.

  The management unit 31 is configured to manage “UE CSG Subscription info” of each mobile station UE. Here, “UE CSG Subscription info” includes “CSG-ID List” including a CSG-ID for identifying one or more CSGs to which each mobile station UE belongs.

  The handover processing unit 32 is configured to receive a handover request signal (HO REQUIRED) from the radio base station eNB.

  In addition, the handover processing unit 32, when the handover request signal (HO REQUIRED) received from the radio base station eNB includes predetermined information (UE Preliminary Access Check Bit), includes the radio base station HeNB or the gateway device. The HeNB-GW is configured to transmit a handover request signal (HO REQUEST) including the predetermined information (UE Preliminary Access Check Bit).

  Further, the handover processing unit 32 is configured to receive a handover request response signal (HO REQUEST ACK) including the CSG-ID of the radio base station HeNB from the radio base station HeNB or the gateway device HeNB-GW.

  The determination unit 33 includes the CSG-ID of the radio base station HeNB included in the handover request response signal (HO REQUEST ACK) received from the radio base station HeNB or the gateway device HeNB-GW, and “CSG-” in the “UE CSG Subscription info”. Based on the CSG-ID of the mobile station UE managed in the “ID list”, it is determined whether the mobile station UE is a registered mobile station or a non-registered mobile station in the radio base station HeNB2.

  Moreover, the determination part 33 determines whether this determination result and the determination result which predetermined information (UE Preliminary Access Check Bit) shows correspond.

  Here, when the determination unit 33 determines that the two do not match, the handover processing unit 32 indicates to the radio base station eNB shown in FIG. 1 that the handover failure signal (HO FAILURE) indicates that the handover processing has failed. And transmits a signal (UE CONTEXT RELEASE COMMAND) instructing to release the allocation of resources to the mobile station UE to the radio base station HeNB.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 5, the operation of the mobile communication system according to the first embodiment of the present invention will be described.

  Specifically, with reference to FIG. 5, in the mobile communication system, an operation when the mobile station UE performs handover from a cell under the radio base station eNB to a cell under the radio base station HeNB2 will be described.

  As shown in FIG. 5, in step S1001, the mobile station UE determines whether or not the mobile station UE is a registered mobile station in the radio base station HeNB2, based on the broadcast information transmitted by the radio base station HeNB2. Then, a measurement report including E-CGI of the radio base station HeNB2 and predetermined information (UE Preliminary Access Check Bit) indicating the determination result is transmitted to the radio base station eNB.

  In step S1002, the radio base station eNB includes the identification information (HeNB-ID (E-CGI) = yyy.001) and predetermined information (UE Preliminary Access Check Bit) of the radio base station HeNB2 with respect to the switching center MME. A handover request signal (HO REQUIRED) is transmitted.

  In step S1003A, the switching center MME transmits a handover request signal (HO REQUEST) including predetermined information (UE Preliminary Access Check Bit) to the gateway device HeNB-GW. In step S1003B, the gateway device HeNB-GW The handover request signal (HO REQUEST) is transmitted to the radio base station HeNB2.

  Here, the radio base station HeNB2 is a mobile station according to predetermined information (UE Preliminary Access Check Bit) included in the handover request signal (HO REQUEST) received from the exchange MME and the access mode in the radio base station HeNB2. A resource allocation process for the UE is performed.

  For example, when the predetermined information (UE Preliminary Access Check Bit) indicates that the mobile station UE is an unregistered mobile station in the radio base station HeNB2, and the access mode in the radio base station HeNB2 is “Hybrid” The base station HeNB2 may perform resource allocation processing for unregistered mobile stations on the mobile station UE.

  In addition, when the predetermined information (UE Preliminary Access Check Bit) indicates that the mobile station UE is a registered mobile station in the radio base station HeNB2, and the access mode in the radio base station HeNB2 is “Hybrid”, the radio base station Station HeNB2 may perform the resource allocation process for registration mobile stations with respect to the mobile station UE.

  Thereafter, in step S1004A, the radio base station HeNB2 makes a handover request response signal (HO REQUEST ACK) including the above resource allocation result and the CSG-ID = # 31 of the radio base station HeNB2 to the gateway device HeNB-GW. In step S1004B, the gateway device HeNB-GW transmits the handover request response signal (HO REQUEST ACK) to the exchange MME.

  In step S1005, the switching center MME receives the CSG-ID = # 31 of the radio base station HeNB2 included in the handover request response signal (HO REQUEST ACK) received from the gateway device HeNB-GW and “UE CSG Subscription info” Based on the CSG-ID of the mobile station UE managed in the “CSG-ID list”, it is determined whether the mobile station UE is a registered mobile station or an unregistered mobile station in the radio base station HeNB2.

  Then, switching center MME determines whether or not the determination result in step S1005 matches the determination result indicated by the predetermined information (UE Preliminary Access Check Bit).

  Here, when it is determined that the two do not match, the switching center MME transmits a handover failure signal (HO FAILURE) indicating that the handover process has failed to the radio base station eNB, to the radio base station HeNB2. Then, a signal (UE CONTEXT RELEASE COMMAND) instructing to release the allocation of resources to the mobile station UE is transmitted.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the first embodiment of the present invention, when the mobile station UE performs handover to a cell under the radio base station HeNB2 operating in “Hybrid”, the radio base station HeNB2 Appropriately differentiate between registered mobile stations and non-registered mobile stations in the radio base station HeNB2 according to predetermined information (UE Preliminary Access Check Bit) included in the handover request signal (HO REQUEST) and the access mode in the radio base station HeNB2. Resource allocation processing can be performed.

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

  A first feature of the present embodiment is a mobile communication method, in which a mobile station UE using a cell under a radio base station eNB (first radio base station) as a serving cell is a radio base station HeNB2 (second radio base station). ) To determine whether or not the mobile station UE is a registered mobile station in the radio base station HeNB2, and the mobile station UE indicates a predetermined result indicating the determination result to the radio base station eNB. Step B for transmitting a measurement report (Measurement Report) including information (UE Preliminary Access Check Bit), and the radio base station eNB to the switching center MME, a handover request signal including predetermined information (UE Preliminary Access Check Bit) (HO REQUIRED) C, the switching center MME transmits a handover request signal (HO REQUEST) including predetermined information (UE Preliminary Access Check Bit) to the radio base station HeNB2, and the radio base station HeNB2 And a step E of performing resource allocation processing for the mobile station UE according to predetermined information (UE Preliminary Access Check Bit) included in the handover request signal (HO REQUEST) received from the mobile station UE and an access mode in the radio base station HeNB2 This is the gist.

  In the first feature of the present embodiment, in step A, the mobile station UE stores the CSG-ID included in the broadcast information in the “Allowed CSG-ID List” managed in the mobile station UE. The above-described determination may be performed based on whether or not

  In the first feature of the present embodiment, in step E, the predetermined information (UE Preliminary Access Check Bit) indicates that the mobile station UE is an unregistered mobile station in the radio base station HeNB2, and the access in the radio base station HeNB2 When the mode is “Hybrid”, the radio base station HeNB2 may perform resource allocation processing for unregistered mobile stations on the mobile station UE.

  In the first feature of the present embodiment, the radio base station HeNB2 notifies the exchange MME of the CSG-ID of the radio base station HeNB2, and the exchange MME is notified by the radio base station HeNB2. A step of determining whether or not the CSG-ID of the radio base station HeNB2 and the CSG-ID of the mobile station UE managed in the “CSG-ID List” in the “UE CSG Subscription info” match. You may have.

  The second feature of the present embodiment is the mobile station UE, and when the cell subordinate to the radio base station eNB is used as a serving cell, based on the broadcast information transmitted by the radio base station HeNB2, the radio base station HeNB2 A determination unit 13 configured to determine whether or not it is a registered mobile station, and a measurement report including predetermined information (UE Preliminary Access Check Bit) indicating the determination result are transmitted to the radio base station eNB The gist of the present invention is to include a measurement report transmission unit 14 configured to do this.

  In the second feature of the present embodiment, the determination unit 13 determines whether the CSG-ID included in the broadcast information is stored in the “Allowed CSG-ID List” managed by the management unit 11. May be configured to perform the above-described determination.

  The third feature of the present embodiment is the radio base station HeNB2, and from the switching center MME, predetermined information (UE Preliminary Access Check Bit) indicating whether the mobile station UE is a registered mobile station in the radio base station HeNB2. ) Including the handover request signal (HO REQUEST) including the resource allocation process for the mobile station UE according to the predetermined information (UE Preliminary Access Check Bit) and the access mode in the radio base station HeNB. The gist of the present invention is to include a handover processing unit 22 configured to perform the processing.

  In the third feature of the present embodiment, the predetermined information (UE Preliminary Access Check Bit) indicates that the mobile station UE is an unregistered mobile station in the radio base station HeNB2, and the access mode in the radio base station HeNB2 is “ In the case of “Hybrid”, the handover processing unit 22 may be configured to perform resource allocation processing for the unregistered mobile station on the mobile station UE.

  The operations of the radio base station HeNB, the switching center MME, the gateway device HeNB-GW, and the mobile station UE described above may be implemented by hardware or may be implemented by a software module executed by a processor. , Or a combination of both.

  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 HeNB, the exchange MME, the gateway device HeNB-GW, and the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station HeNB, the switching center MME, the gateway device HeNB-GW, and the mobile station UE.

  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. 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 11 ... management unit 12 ... broadcast information reception unit 13 ... determination unit 14 ... measurement report transmission unit HeNB ... radio base station 21 ... measurement report reception unit 22 ... handover processing unit MME ... exchange 31 ... management unit 32 ... Handover processing unit 33 ... determination unit

Claims (1)

  A first radio base station and a second radio base station operable in any of “Open”, “Closed”, or “Hybrid” are provided, and the second radio base station is connected under the gateway device. In the mobile communication system, a mobile communication method when a mobile station performs handover from a cell under the first radio base station to a cell under the second radio base station,
  A switching center transmitting a handover request signal including predetermined information indicating whether the mobile station is a registered mobile station or an unregistered mobile station in the second radio base station to the gateway device;
  The gateway device transmitting a handover request signal including the predetermined information to the second radio base station;
  When the predetermined information indicates that the mobile station is a registered mobile station in the second radio base station, and the second radio base station is operating in “Hybrid”, the second radio base station Performing a resource allocation process for a registered mobile station on the mobile station;
  When the predetermined information indicates that the mobile station is an unregistered mobile station in the second radio base station, and the second radio base station is operating in “Hybrid”, the second radio base station Performing a resource allocation process for an unregistered mobile station.

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