JP2011166372A - Mobile communication method and wireless base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a communication recovery time after reconnection processing when RLF is detected during hand-over processing even when release numbers of RRC protocol functions used by a reconnection-source wireles base station and a reconnection-destination wireless base station are different. <P>SOLUTION: A mobile communication method includes a process wherein a wireless base station eNB#3 transmits a context information transfer request signal including a release number of the RRC protocol function used by the wireless base station eNB#3 to a wireless base station eNB#1 managing a cell #1 specified with PCI included in received "RRC Connection Re-establishment Request", and a process wherein the wireless base station eNB#1 transfers context information associated with a mobile station UE generated by an RRC protocol function with a resource number included in the received context information transfer request signal to the wireless base station eNB#3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  Referring to FIG. 5, in a mobile communication system using the LTE (Long Term Evolution) scheme, when the mobile station UE detects RLF (Radio Link Failure, radio link failure) during the handover process, reconnection (RRC) An operation for shortening the communication recovery time after the Connection Re-establishment process will be described.

  As shown in FIG. 5, in step S2001, the mobile station UE performs handover to the cell # 2 under the radio base station eNB # 2 when the mobile station UE communicating with the cell # 1 under the radio base station eNB # 1 RLF is detected in the middle of the process, and cell # 3 under radio base station eNB # 3 is selected as the reconnection destination cell.

  In step S2002, the mobile station UE transmits “RRC Connection Re-establishment Request” including the PCI (Physical Cell ID) of the cell # 1 to the radio base station eNB # 3.

  In step S2003, the radio base station eNB # 3 transmits to the mobile station UE such as “UE Context” or “RRC Context” for the cell # 1 specified by the PCI included in the “RRC Connection Re-establishment Request”. A context information transfer request signal (for example, “UE Context Inquiry Request”) requesting transfer of the context information is transmitted.

  In step S2004, the radio base station eNB # 1 makes a context related to the mobile station UE such as “UE Context” and “RRC Context” to the radio base station eNB # 3 in response to the received context information transfer request signal. A context information transfer signal including information (for example, “UE Context Response”) is transmitted.

  In step S2005, the radio base station eNB # 3 transmits “RRC Connection Re-establishment” to the mobile station UE.

  In step S2006, the mobile station UE transmits “RRC Connection Re-establishment Complete” to the radio base station eNB # 3.

3GPP TSG-RAN WG3, R3-100239, “Enabling UE-originated RLF reporting for SON MRO”, Nokia Siemens Networks 3GPP TSG-RAN WG3, R3-100240, “Addition of a description of a UE to UE context”, Nokia Siemens Networks 3GPP TSG-RAN WG3, R3-100241, "A procedure to fit UE context in case of post-RLF RRC restablism", Nokia Siemens Networks

  However, in the mobile communication system described above, the release number of the RRC (Radio Resource Control) protocol function used in the radio base station eNB # 1 and the release number of the RRC protocol function used in the radio base station eNB # 3 Is different, there is a problem that the radio base station eNB # 3 may not be able to interpret the context information (particularly, RRC Context) related to the mobile station UE acquired from the radio base station eNB # 1.

  Therefore, the present invention has been made in view of the above problems, and the release number of the RRC protocol function used in the reconnection source radio base station and the RRC protocol function used in the reconnection destination radio base station. To provide a mobile communication method and a radio base station capable of shortening the communication recovery time after reconnection processing when RLF is detected during handover processing even when the release number is different Objective.

  A first feature of the present invention is a mobile communication method, in which a mobile station in communication in a first cell under a first radio base station performs a handover process to a second cell under a second radio base station. When a radio link failure is detected in step (b), a step of transmitting a reconnection request signal including identification information of the first cell to a third radio base station; and A context information transfer request including a release number of a predetermined protocol function used in the third radio base station for the first radio base station managing the first cell specified by the identification information included in the signal Transmitting the signal, and the first radio base station sends the third radio base station to the third radio base station generated by the predetermined protocol function of the resource number included in the context information transfer request signal. And summarized in that a step of transferring context information related to a station.

  The second feature of the present invention is that a mobile station communicating in the first cell under the first radio base station detects a radio link failure during the handover process to the second cell under the second radio base station. In this case, in a mobile communication system configured to transmit a reconnection request signal to a third radio base station, the radio base station operable as the third radio base station, the mobile station A reception unit configured to receive a reconnection request signal including identification information of the first cell, and according to the reconnection request signal, specified by the identification information included in the reconnection request signal A context that includes a release number of a predetermined protocol function used in the radio base station and requests transfer of context information related to the mobile station to the first radio base station that manages the first cell And gist in that it comprises a transmitter unit configured to transmit a broadcast transfer request signal.

  The third feature of the present invention is that a mobile station communicating in the first cell under the first radio base station detects a radio link failure during the handover process to the second cell under the second radio base station. In this case, in a mobile communication system configured to transmit a reconnection request signal to a third radio base station, the radio base station operable as the first radio base station, the third radio base station A receiver configured to receive a context information transfer request signal including a release number of a predetermined protocol function used in the third radio base station from a base station; A transmitting unit configured to transfer context information related to the mobile station generated by the predetermined protocol function of the resource number included in the context information transfer request signal And summarized in that it comprises a.

  As described above, according to the present invention, the release number of the RRC protocol function used in the reconnection source radio base station is different from the release number of the RRC protocol function used in the reconnection destination radio base station. Even in this case, it is possible to provide a mobile communication method and a radio base station that can shorten the communication recovery time after the reconnection process when the RLF is detected during the handover process.

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 eNB # 1 according to the first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station eNB # 3 according to the first embodiment of the present 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.

  As shown in FIG. 1, the mobile communication system according to the present embodiment manages an exchange MME (Mobility Management Entity), an LTE radio base station eNB # 1 that manages cell # 1, and cell # 2. An LTE radio base station eNB # 2 and an LTE radio base station eNB # 3 that manages the cell # 3 are provided.

  For example, the radio base station eNB # 1 is configured to be equipped with an RRC protocol function defined by “Release 10”, and the radio base station eNB # 2 is configured with an RRC protocol function defined by “Release 9”. The radio base station eNB # 3 is configured to have the RRC protocol function defined in “Release 8”.

  Moreover, in the example of FIG. 1, between radio base station eNB # 1 and radio base station eNB # 2, between radio base station eNB # 2 and radio base station eNB # 3, and radio base station eNB # 1 And the radio base station eNB # 3 are configured to set an X2 connection.

  Moreover, in the example of FIG. 1, between the exchange MME and the radio base station eNB # 1, between the exchange MME and the radio base station eNB # 2, and between the exchange MME and the radio base station eNB # 3. The S1 connection is set between each other.

  Hereinafter, in the present embodiment, the mobile station UE communicating in the cell # 1 (first cell) under the radio base station eNB # 1 is in the middle of the handover process to the cell # 2 under the radio base station eNB # 2. A case where RLF is detected will be described as an example.

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

  The management unit 11 is configured to manage the release number (for example, “Release 10”) of the RRC protocol function installed in the radio base station eNB # 1.

  Here, the management part 11 may be comprised so that the release number of the RRC protocol function mounted in the surrounding radio base station eNB of radio base station eNB # 1 may be managed.

  The receiving unit 12 is configured to receive a context information transfer request signal such as “UE Context Inquiry Request” from the radio base station eNB # 3.

  The transmission unit 13 generates, for the radio base station eNB # 3, the mobile station generated by the RRC protocol function of the resource number (for example, “Release 8”) included in the context information transfer request signal received by the reception unit 12 It is configured to transfer context information (for example, “UE Context” or “RRC Context”) related to the UE.

  As illustrated in FIG. 3, the radio base station eNB # 3 includes a management unit 21, a reception unit 22, and a transmission unit 23.

  The management unit 21 is configured to manage the release number (for example, “Release 8”) of the RRC protocol function installed in the radio base station eNB # 3.

  Here, the management part 21 may be comprised so that the release number of the RRC protocol function mounted in the surrounding radio base station eNB of radio base station eNB # 3 may be managed.

  The receiving unit 22 is configured to receive “RRC Connection Re-establishment Request” including the PCI of the cell # 1 from the mobile station UE.

  Further, the reception unit 22 receives a context information transfer signal (for example, “UE Context Response”) including context information (for example, “UE Context” or “RRC Context”) of the mobile station UE from the radio base station eNB # 1. It is configured to receive.

  The transmission unit 23 transmits the radio base station eNB # 3 to the radio base station eNB # 1 that manages the cell # 1 specified by the PCI included in the “RRC Connection Re-establishment Request” received by the reception unit 22. Context information transfer that includes a release number (eg, “Release 8”) of the RRC protocol function used by the mobile station UE and requests to transfer context information (eg, “UE Context” or “RRC Context”) related to the mobile station UE It is configured to transmit a request signal (eg, “UE Context Inquiry Request”).

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 4, the operation of the mobile communication system according to the first embodiment of the present invention will be described.

  Specifically, with reference to FIG. 4, an operation when the mobile station UE detects an RLF during the handover process in the mobile communication system according to the present embodiment will be described.

  As shown in FIG. 4, in step S1001, the mobile station UE performs handover to the cell # 2 under the radio base station eNB # 2 when the mobile station UE communicating with the cell # 1 under the radio base station eNB # 1 RLF is detected in the middle of the process, and cell # 3 under radio base station eNB # 3 is selected as the reconnection destination cell.

  In step S1002, the mobile station UE transmits “RRC Connection Re-establishment Request” including the PCI of the cell # 1 to the radio base station eNB # 3.

  In step S1003, the radio base station eNB # 3 performs "UE Context" and "UE" for the radio base station eNB # 1 that manages the cell # 1 specified by the PCI included in the "RRC Connection Re-establishment Request". A context information transfer request signal (for example, “UE Context Inquiry Request”) for requesting transfer of context information related to the mobile station UE such as “RCC Context” is transmitted.

  Here, the radio base station eNB # 3 transmits the context information transfer request signal including the release number (for example, “Release 8”) of the RRC protocol function used in the radio base station eNB # 3.

  In step S1004, the radio base station eNB # 1 makes a context related to the mobile station UE such as “UE Context” and “RRC Context” to the radio base station eNB # 3 in response to the received context information transfer request signal. A context information transfer signal including information (for example, “UE Context Response”) is transmitted.

  Here, the radio base station eNB # 1 generates the context information (particularly “RRC Context”) related to the above-described mobile station UE by the RRC protocol function of the release number included in the context information transfer request signal.

  In step S1005, the radio base station eNB # 3 transmits “RRC Connection Re-establishment” to the mobile station UE.

  In step S1006, the mobile station UE transmits “RRC Connection Re-establishment Complete” to the radio base station eNB # 3.

(Operation and effect of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the present embodiment, the radio base station eNB # 3 performs the radio base station eNB # 1 with respect to the radio base station eNB # 1 in response to the “RRC Connection Re-establishment Request” from the mobile station UE. A context information transfer request signal including the release number of the RRC protocol function used in eNB # 3 is transmitted, and the radio base station eNB # 1 transfers to the radio base station eNB # 3 by the RRC protocol function of the release number. Since it is configured to generate context information related to the mobile station UE to be performed, the radio base station eNB # 1 (reconnection source radio base station) and the radio base station eNB # 3 (reconnection destination radio base station) Even if the release number of the RRC protocol function used is different, Communication recovery time after reconnection processing when RLF is detected on the way can be shortened.

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

  The first feature of the present embodiment is that the mobile station UE communicating in the cell # 1 (first cell) under the radio base station eNB # 1 (first radio base station) 2) When an RLF (radio link failure) is detected during handover processing to cell # 2 (second cell) under the control of radio base station eNB # 3 (third radio base station) , A step of transmitting “RRC Connection Re-establishment Request (reconnection request signal)” including PCI (identification information) of cell # 1, and radio base station eNB # 3 is included in “RRC Connection Re-establishment Request” Used by radio base station eNB # 3 for radio base station eNB # 1 managing cell # 1 specified by PCI Transmitting a context information transfer request signal (for example, “UE Context Inquiry Request”) including a release number (for example, Release 8 / Release 9 / Release 10) of the RRC protocol function (predetermined protocol function), and a radio base station The mobile station UE generated by the eNB # 1 with respect to the radio base station eNB # 3 by the RRC protocol function of the resource number (for example, Release 8 / Release 9 / Release 10) included in the received context information transfer request signal And a step of transferring context information (for example, “UE Context” and “RRC Context”) according to the above.

  The second feature of the present embodiment is that the mobile station UE communicating in the cell # 1 under the radio base station eNB # 1 performs RLF during the handover process to the cell # 2 under the radio base station eNB # 2. In the mobile communication system configured to transmit “RRC Connection Re-establishment Request” to the radio base station eNB # 3 when detected, the radio base station eNB operable as the radio base station eNB # 3 In response to the “RRC Connection Re-establishment Request”, the receiving unit 22 configured to receive the “RRC Connection Re-establishment Request” including the PCI of the cell # 1 from the mobile station UE, “RRC Con The release number (for example, Release 8) of the RRC protocol function used in the radio base station eNB with respect to the radio base station eNB # 1 that manages the cell # 1 specified by the PCI included in the “ection Re-establishment Request”. / Release 9 / Release 10), and a context information transfer request signal (for example, “UE Context Inquiry Request”) for requesting transfer of context information (for example, “UE Context” or “RRC Context”) related to the mobile station UE. The gist of the present invention is that it comprises a transmission unit 23 configured to transmit.

  The third feature of the present embodiment is that the mobile station UE communicating in the cell # 1 under the radio base station eNB # 1 performs RLF during the handover process to the cell # 2 under the radio base station eNB # 2. In the mobile communication system configured to transmit “RRC Connection Re-establishment Request” to the radio base station eNB # 3 when detected, the radio base station eNB operable as the radio base station eNB # 1 And a context information transfer request signal (for example, Release 8 / Release 9 / Release 10) including a release number (for example, Release 8 / Release 9 / Release 10) of the RRC protocol function used in the radio base station eNB # 3. , “UE Context Inquiry Request”) Resource number (for example, Release 8 / Release) included in the context information transfer request signal (for example, “UE Context Inquiry Request”) to the receiving unit 12 configured to communicate with the radio base station eNB # 3 9 / Release 10) including a transmission unit 13 configured to transfer context information (for example, “UE Context” and “RRC Context”) related to the mobile station UE generated by the RRC protocol function. Is the gist.

  Note that the operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by 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 registerable 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 mobile station UE and the radio base station eNB. Moreover, this storage medium and processor may be provided in the mobile station UE and the radio base station eNB 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. 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 ... radio base station 11, 21 ... management unit 12, 22 ... reception unit 13, 23 ... transmission unit

Claims (3)

When a mobile station communicating in the first cell under the first radio base station detects a radio link failure during the handover process to the second cell under the second radio base station, the mobile station communicates with the third radio base station. In contrast, a step of transmitting a reconnection request signal including identification information of the first cell;
The third radio base station is used by the third radio base station for the first radio base station that manages the first cell specified by the identification information included in the reconnection request signal. Transmitting a context information transfer request signal including a release number of a predetermined protocol function;
The first radio base station transfers the context information related to the mobile station generated by the predetermined protocol function of the resource number included in the context information transfer request signal to the third radio base station. And a mobile communication method. When a mobile station communicating in the first cell under the first radio base station detects a radio link failure during the handover process to the second cell under the second radio base station, the mobile station communicates with the third radio base station. In a mobile communication system configured to transmit a reconnection request signal to a radio base station operable as the third radio base station,
A receiving unit configured to receive a reconnection request signal including identification information of the first cell from the mobile station;
In response to the reconnection request signal, for the first radio base station that manages the first cell specified by the identification information included in the reconnection request signal, a predetermined used in the radio base station A radio base station, comprising: a transmission unit that includes a release number of a protocol function and is configured to transmit a context information transfer request signal for requesting transfer of context information related to the mobile station. When a mobile station communicating in the first cell under the first radio base station detects a radio link failure during the handover process to the second cell under the second radio base station, the mobile station communicates with the third radio base station. In a mobile communication system configured to transmit a reconnection request signal to a radio base station operable as the first radio base station,
A receiving unit configured to receive from the third radio base station a context information transfer request signal including a release number of a predetermined protocol function used in the third radio base station;
A transmitter configured to transfer context information related to the mobile station generated by the predetermined protocol function of the resource number included in the context information transfer request signal to the third radio base station; A radio base station comprising:

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