JP2012010111A - Mobile communication method and radio access network device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly judge whether to perform "SRB only Handover" or not depending on capability of a mobile station.SOLUTION: A mobile communication method according to the present invention comprises transmitting information relating to "SRB only Handover" from a radio base station eNB managing a cell #1 to a radio network controller RNC managing a cell #2, determining whether to perform handover from the cell #1 to the cell #2 of a mobile station UE as "SRB only Handover" based on the information relating to "SRB only Handover" by the radio network controller RNC, and transmitting a result of the determination from the radio network controller RNC to the radio base station eNB.

Description

  The present invention relates to a mobile communication method and a radio access network apparatus.

  As shown in FIG. 6, in a mobile communication system stipulated by 3GPP, a handover process from a mobile station UE's Long Term Evolution (LTE) system cell # 1 to a UTRA (Universal Terrestrial Radio Access) system cell # 2 In cell # 2, among the radio bearers set up in cell # 1, only the signaling radio bearer (Signaling radio bearer) is taken over, and the data radio bearer (Data radio bearer) is not taken over "SRB (Signaling radio bearer). bearer) only Handover ”.

3GPP contribution R2-104024 3GPP contribution S2-103066 3GPP TS 23.401 3GPP TS25.331 3GPP TS25.413

  In a conventional mobile communication system, whether or not the UTRA radio network controller RNC (Radio Network Controller) should perform the handover process from the cell # 1 to the cell # 2 of the mobile station UE as “SRB only Handover” It is comprised so that determination about may be performed.

  However, the conventional mobile communication system has a problem that the radio network controller RNC cannot know whether or not the mobile station UE supports “SRB only Handover”.

  Therefore, the present invention has been made in view of the above-described problem, and a mobile communication method and a radio access capable of appropriately determining whether or not “SRB only Handover” should be performed according to the capability of the mobile station. An object is to provide a network device.

  A first feature of the present invention is a mobile communication method for performing a handover process from a first cell of a first radio access scheme to a second cell of a second radio access scheme of a mobile station, which manages the first cell A first radio access network apparatus that transmits information related to a handover process of only a signaling radio bearer to a second radio access network apparatus that manages the second cell; and the second radio access network apparatus Determining whether or not the handover process from the first cell to the second cell of the mobile station should be performed as a handover process of only the signaling radio bearer based on the information; and 2 a wireless access network device that transmits the determination result to the first wireless access network device; And summarized in that a and.

  According to a second aspect of the present invention, in the mobile communication system capable of performing a handover process from the first cell of the first radio access scheme to the second cell of the second radio access scheme of the mobile station, the second cell A radio access network apparatus functioning as a second radio access network apparatus to be managed, wherein the first radio access network apparatus managing the first cell transmits information related to a handover process of only the signaling radio bearer. And determining whether or not the handover process from the first cell of the mobile station to the second cell should be performed as a handover process of only the signaling radio bearer based on the information. Configured to transmit the determination result to the first radio access network device. It is summarized as that is configured to.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a radio access network apparatus that can appropriately determine whether or not to perform “SRB only Handover” according to the capability of a mobile station. Can do.

1 is an overall configuration diagram of a mobile communication system according to a 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 figure which shows an example of the format of the information element "Source RNC to Target RNC Transient Container" in "Handover Required" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of "Handover Command" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of the information element "E-RABs Release List" in "Handover Command" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the conventional mobile communication system.

(Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a first embodiment of the present invention will be described with reference to FIG. 1 to FIG.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes a mobility management node MME (Mobility Management Entity), a radio base station eNB, a packet switching center SGSN (Serving GPRS Support Node), a radio network controller. An RNC and a radio base station NB are provided.

  Here, the radio base station eNB manages the LTE cell # 1, and the radio network controller RNC manages the UTRA cell # 2.

  Hereinafter, with reference to FIG. 2 to FIG. 5, a description will be given of a part of the operation of the handover process from the LTE cell # 1 of the mobile station UE to the UTRA cell # 2 in the mobile communication system according to the present embodiment. .

  As illustrated in FIG. 2, when the handover process is started in step S1000, in step S1001, the radio base station eNB transmits, to the mobility management node MME, “Handover” including information related to “SRB only Handover”. “Required” is transmitted.

  Specifically, as illustrated in FIG. 3, the radio base station eNB performs “SRB only HO support” by an information element “SRB only HO support” in an information element “Source RNC to Target RNC Transient Container” in “Handover Required”. Information related to “Handover” is configured to be transmitted.

  Note that the information related to “SRB only Handover” may indicate whether or not “SRB only Handover” is supported in the mobile station UE.

  For example, the radio base station eNB supports “SRB only Handover” in the mobile station UE via “UE Capability Information” when setting “RRC Connection” with the mobile station UE. It is configured to acquire information indicating whether or not there is.

  Further, the information related to “SRB only Handover” may indicate whether or not the handover process from the cell # 1 to the cell # 2 of the mobile station UE should be performed as “SRB only Handover”.

  For example, the radio base station eNB refers to information indicating whether “SRB only Handover” is supported in the mobile station UE, and performs a handover process from the cell # 1 to the cell # 2 of the mobile station UE. It is configured to determine whether or not to perform as “SRB only Handover”.

  In step S1002, the mobility management node MME transmits “Forward Relocation Request” including information related to the above-mentioned “SRB only Handover” to the packet switching center SGSN.

  In step S1003, the packet switching center SGSN transmits “Relocation Request” including the information related to the “SRB only Handover” to the radio network controller RNC.

  In step S1004, the radio network controller RNC should perform the handover process from the cell # 1 to the cell # 2 of the mobile station UE as “SRB only Handover” based on the information related to the “SRB only Handover” described above. Determine whether or not.

  In step S1005, the radio network controller RNC transmits “Relocation Request Acknowledge” including the above determination result to the packet switching center SGSN.

  For example, the radio network controller RNC may transmit “Relocation Request Acknowledge” including only the list of data radio bearers to be released after the handover process as the above determination result to the packet switching center SGSN.

  Alternatively, the radio network controller RNC includes, for the packet switching center SGSN, as a result of the above determination, including a list of data radio bearers to be released after the handover process and no data radio bearer to be set after the handover process. “Relocation Request Acknowledge” may be transmitted.

  In step S1006, the packet switching center SGSN transmits “Forward Relocation Request Response” including the above determination result to the mobility management node MME.

  In step S1007, the mobility management node MME transmits “Handover Command” included in the received “Forward Relocation Request Response” to the radio base station eNB.

  Here, as shown in FIGS. 4 and 5, the information element “E-RAB to Release List” in the “Handover Command” includes a list of data radio bearers to be released after the above-described handover process.

  In step S1008, the radio base station eNB transmits “HO from E-UTRAN Command” to the mobile station UE.

  According to the mobile communication system according to the present embodiment, the radio network controller RNC performs the cell # 1 to cell # 2 of the mobile station UE based on the information related to “SRB only Handover” transmitted by the radio base station eNB. Since it can be determined whether or not the handover process to “SRB only Handover” should be performed, it can be appropriately determined whether or not “SRB only Handover” should be performed according to the capability of the mobile station.

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

  The first feature of the present embodiment is that cell # 1 (second cell) of UTRA (second radio access scheme) from cell # 1 (first cell) of LTE scheme (first radio access scheme) of mobile station UE. A mobile communication method for performing a handover process to a radio base station eNB (first radio access network apparatus) that manages cell # 1, and a radio network controller RNC (second radio access network) that manages cell # 2 Device) to transmit information related to “SRB only Handover (handover processing of only radio bearer for signaling)” and the radio network controller RNC moves based on the information related to “SRB only Handover”. Whether or not the handover process from the cell # 1 to the cell # 2 of the station UE should be performed as “SRB only Handover” And determining with the radio network controller RNC to the radio base station eNB, and summarized in that a step of transmitting such determination result.

  The second feature of the present embodiment is that, in a mobile communication system capable of performing a handover process from the LTE cell # 1 to the UTRA cell # 2 of the mobile station UE, radio channel control for managing the cell # 2 The station RNC is configured to transmit information related to “SRB only Handover” from the radio base station eNB that manages cell # 1, and based on the information related to “SRB only Handover”, the mobile station It is configured to determine whether or not the handover process from the cell # 1 to the cell # 2 of the UE should be performed as “SRB only Handover”, and the determination result is transmitted to the radio base station eNB. It is summarized as follows.

  In the first and second features of the present embodiment, the information related to “SRB only Handover” may indicate whether or not “SRB only Handover” is supported in the mobile station UE.

  In the first and second features of the present embodiment, the information related to “SRB only Handover” should perform the handover process of the mobile station UE from cell # 1 to cell # 2 as “SRB only Handover”. It may be shown whether or not.

  The operations of the mobility management node MME, the packet switching center SGSN, the radio network controller RNC, the radio base station eNB / NB, and the mobile station UE described above may be implemented by hardware or software executed by a processor. It may be implemented by a module 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 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 mobility management node MME, the packet switching center SGSN, the radio network controller RNC, the radio base station eNB / NB, or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the mobility management node MME, the packet switching center SGSN, the radio network controller RNC, the radio base station eNB / NB, or 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.

UE ... mobile station eNB, NB ... radio base station MME ... mobility management node SGSN ... packet switching station RNC ... radio network controller

Claims (6)

A mobile communication method for performing a handover process from a first cell of a first radio access scheme of a mobile station to a second cell of a second radio access scheme,
A step in which a first radio access network apparatus that manages the first cell transmits information related to a handover process of only a signaling radio bearer to a second radio access network apparatus that manages the second cell;
Whether the second radio access network apparatus should perform the handover process from the first cell to the second cell of the mobile station as a handover process only for the signaling radio bearer based on the information A determining step;
The second radio access network device includes a step of transmitting the determination result to the first radio access network device.   The mobile communication method according to claim 1, wherein the information indicates whether or not handover processing of only the signaling radio bearer is supported in the mobile station.   2. The information indicates whether or not a handover process from the first cell to the second cell of the mobile station should be performed as a handover process only for the signaling radio bearer. The mobile communication method described in 1. In a mobile communication system capable of performing handover processing from a first cell of a first radio access scheme to a second cell of a second radio access scheme of a mobile station, as a second radio access network apparatus that manages the second cell A functioning wireless access network device,
The first radio access network device that manages the first cell is configured to transmit information related to handover processing of only the signaling radio bearer,
Based on the information, it is configured to determine whether or not the handover process from the first cell of the mobile station to the second cell should be performed as a handover process of only the signaling radio bearer,
A radio access network apparatus configured to transmit the determination result to the first radio access network apparatus.   The radio access network apparatus according to claim 4, wherein the information indicates whether or not handover processing of only the signaling radio bearer is supported in the mobile station.   5. The information indicates whether or not a handover process from the first cell to the second cell of the mobile station should be performed as a handover process of only the signaling radio bearer. A radio access network device according to claim 1.

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