JP2011223122A - Mobile communication method and relay node - Google Patents

Abstract

PROBLEM TO BE SOLVED: To synchronize timing to validate an MBSFN subframe between a wireless base station DeNB and a relay node RN.SOLUTION: A mobile communication method according to the present invention comprises a step in which the wireless base station DeNB transmits "RRC Connection Reconfiguration" for informing setting information of the MBSFN subframe and a predetermined period to the relay node RN; and a step in which the relay node RN validates the setting information of the MBSFN subframe when the predetermined period has passed after receiving "RRC Connection Reconfiguration" or at timing t4.

Description

  The present invention relates to a mobile communication method and a relay node.

  In a mobile communication system using the LTE (Long Term Evolution) scheme and the LTE-Advanced scheme, a subframe (hereinafter, MBSFN subframe) for MBSFN (Multi-Media Broadcast over Single Frequency Network) can be configured. ing.

  Further, the LTE-Advanced mobile communication system is configured such that the relay node RN can be arranged under the radio base station DeNB.

3GPP TS 36.300, “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN 12 months; E-UTRAN 12 months); 3GPP TR36.912, “Feasibility study for Further Advancements for E-UTRA (LTE-Advanced)”, March 2010

  However, when the radio base station DeNB instructs the relay node RN to set the MBSFN subframe, the radio base station DeNB and the relay node RN synchronize the timing for enabling the MBSFN subframe. There was a problem that it could not be made.

  Therefore, the present invention has been made in view of the above-described problems, and a mobile communication method and a relay node that can synchronize the timing at which an MBSFN subframe is enabled between a radio base station DeNB and a relay node RN. The purpose is to provide.

  A first feature of the present invention is a mobile communication method in which a radio base station transmits configuration information for notifying MBSFN subframe setting information and a predetermined period to a relay node, and the relay node And a step of validating the setting information of the MBSFN subframe when the predetermined period has elapsed after receiving the configuration information.

  A second feature of the present invention is a mobile communication method, in which a radio base station transmits configuration information for notifying MBSFN subframe setting information to a relay node; and And a step of validating the setting information of the MBSFN subframe when the transmission / reception timing of a predetermined system frame arrives after receiving the configuration information.

  A third feature of the present invention is a relay node, and when receiving configuration information for notification of MBSFN subframe setting information and a predetermined period from a radio base station, the predetermined period after receiving the configuration information. The gist of the present invention is that it includes a setting unit configured to validate the setting information of the MBSFN subframe when elapses.

  A fourth feature of the present invention is a relay node, which receives the configuration information for notifying the setting information of the MBSFN subframe from the radio base station and then receives the MBSFN when the transmission / reception timing of the predetermined system frame arrives. The gist is to include a setting unit configured to validate the setting information of the subframe.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a relay node that can synchronize the timing for enabling the MBSFN subframe between the radio base station DeNB and the relay node RN. .

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 relay node according to the first embodiment of the present invention. It is a figure for demonstrating operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 2nd Embodiment of this invention.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 3, 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 includes a radio base station DeNB and a relay node RN.

  As illustrated in FIG. 2, the relay node RN includes an RRC Connection Reconfiguration processing unit 11, an MBSFN subframe setting unit 12, and a transmission unit 13.

  The RRC Connection Reconfiguration processing unit 11 is configured to perform an RRC connection reconfiguration process with the radio base station DeNB.

  For example, the RRC Connection Reconfiguration processing unit 11 is configured to receive “RRC Connection Reconfiguration” for notifying the setting information of the MBSFN subframe and a predetermined period from the radio base station DeNB.

  The MBSFN subframe setting unit 12 is configured to validate the setting information of the MBSFN subframe when a predetermined period has elapsed after the “RCC Connection Reconfiguration” is received by the RRC Connection Reconfiguration processing unit 11.

  For example, when “Activation timer = T subframe” is notified as a predetermined period by “RRC Connection Reconfiguration”, the MBSFN subframe setting unit 12 corresponds to the T subframe after “RRC Connection Reconfiguration” is received. When time elapses (that is, at timing t4 in FIG. 3), the subframe specified by the setting information of the MBSFN subframe starts to be used as an MBSFN subframe.

  The transmitter 13 transmits the mobile station UE in the subordinate cell from the timing corresponding to “BCCH modification period” before the timing at which the setting information of the MBSFN subframe is validated (ie, timing t3 in FIG. 4). In response, the notification information is changed.

  For example, the transmission unit 13 sets the “SystemInfoModification” transmitted as the information element in the paging message to “true” or changes the value of “systemInfoValueTag” transmitted as the information element in the SIB1. It is configured to notify the mobile station that the content of the information has been changed.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As illustrated in FIG. 3, in step S1001 (timing t1), the radio base station DeNB transmits “RRC Connection Reconfiguration” that notifies the relay node RN of the setting information of the MBSFN subframe and a predetermined period.

  In the example of FIG. 3, the radio base station DeNB notifies the relay node RN of “Activation timer = T subframe” as a predetermined period.

  In step S1002 (timing t2), the relay node RN transmits “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  After that, the relay node RN receives the “RRC Connection Reconfiguration”, and when the predetermined time (time corresponding to the T subframe) has elapsed, that is, in step S1004 (timing t4), the setting information of the MBSFN subframe In other words, the subframe specified by the setting information of the MBSFN subframe is used as the MBSFN subframe.

  Similarly, the radio base station DeNB, when a predetermined time (time corresponding to the T subframe) has elapsed after transmitting “RRC Connection Reconfiguration”, that is, in step S1004 (timing t4), the MBSFN subframe The setting information is validated, that is, the use of the subframe specified by the setting information of the MBSFN subframe as the MBSFN subframe is started.

  Note that the relay node RN starts from the timing t3 corresponding to the “BCCH modification period” before the timing t4 at which the setting information of the MBSFN subframe is validated, that is, from the timing t3, in the cell under the relay node RN. A paging message or SIB1 notifying that the content of the broadcast information is changed is transmitted to the mobile station UE.

  That is, relay node RN transmits a paging message or SIB1 notifying that the content of broadcast information is changed in “BCCH modification period # 1”.

  Thereafter, the relay node RN transmits the changed notification information (“Updated information”) in “BCCH modification period # 2”.

  According to the system for mobile communication according to the present embodiment, when the time corresponding to the T subframe has elapsed from the transmission / reception timing t1 of “RRC Connection Reconfiguration”, both the relay node RN and the radio base station DeNB Since the frame setting information is configured to be valid, the timing for enabling the MBSFN subframe can be synchronized between the radio base station DeNB and the relay node RN.

(Mobile communication system according to the second embodiment of the present invention)
With reference to FIG. 4, the structure of the mobile communication system which concerns on the 2nd Embodiment of this invention is demonstrated. Hereinafter, the mobile communication system according to the present embodiment will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  The MBSFN subframe setting unit 12 of the relay node RN according to the present embodiment receives / transmits a predetermined system frame (for example, the system frame SFN # 0) after “RRC Connection Reconfiguration” is received by the RRC Connection Reconfiguration processing unit 11. Is set (ie, at timing t4 in FIG. 4), the setting information of the MBSFN subframe is made valid.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As illustrated in FIG. 4, in step S2001 (timing t1), the radio base station DeNB transmits “RRC Connection Reconfiguration” for notifying the relay node RN of the setting information of the MBSFN subframe.

  In the example of FIG. 4, it is assumed that the transmission / reception timing of the system frame SFN # 100 has arrived at the timing when the relay node RN transmits “RRC Connection Reconfiguration”.

  In Step S2002 (timing t2), the relay node RN transmits “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  Thereafter, after receiving “RRC Connection Reconfiguration”, the relay node RN makes a round of the system frame number (System Frame Number), and when the transmission / reception timing of the system frame SFN # 0 arrives, that is, step S2004 (timing t4). ), The MBSFN subframe setting information is validated, that is, the use of the subframe specified by the MBSFN subframe setting information as the MBSFN subframe is started.

  In the LTE mobile communication system, since the system frame number is expressed in a 10-bit area, the system frame number becomes “1024”, then returns to “0” and increases again.

  Similarly, after transmitting the “RRC Connection Reconfiguration”, the radio base station DeNB makes a round of the system frame number, and when the transmission / reception timing of the system frame SFN # 0 has arrived, that is, in step S2004 (timing t4), The setting information of the MBSFN subframe is validated, that is, the use of the subframe specified by the setting information of the MBSFN subframe as the MBSFN subframe is started.

  Note that the relay node RN starts from the timing t3 corresponding to the “BCCH modification period” before the timing t4 at which the setting information of the MBSFN subframe is validated, that is, from the timing t3, in the cell under the relay node RN. A paging message or SIB1 notifying that the content of the broadcast information is changed is transmitted to the mobile station UE.

  That is, relay node RN transmits a paging message or SIB1 notifying that the content of broadcast information is changed in “BCCH modification period # 1”.

  Thereafter, the relay node RN transmits the changed notification information (“Updated information”) in “BCCH modification period # 2”.

  According to the system for mobile communication according to the present embodiment, after the transmission / reception timing t1 of “RRC Connection Reconfiguration” (transmission / reception timing of system frame SFN # 100), the system frame number makes a round and the transmission / reception timing of system frame SFN # 0. Since both the relay node RN and the radio base station DeNB are configured to validate the setting information of the MBSFN subframe, the MBSFN sub-band between the radio base station DeNB and the relay node RN The timing for enabling the frame can be synchronized.

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

  The first feature of the present embodiment is a mobile communication method, in which the radio base station DeNB notifies the relay node RN of MBSFN subframe setting information and a predetermined period of time “RRC Connection Reconfiguration (configuration information)” And a step of making the MBSFN subframe setting information valid when a predetermined time has elapsed since the relay node RN received “RRC Connection Reconfiguration”, that is, at timing t4. This is the gist.

  The second feature of the present embodiment is a mobile communication method, in which the radio base station DeNB transmits “RRC Connection Reconfiguration” for notifying the relay node RN of the setting information of the MBSFN subframe; After the relay node RN receives “RRC Connection Reconfiguration”, when the transmission / reception timing of a predetermined system frame (for example, system frame SFN # 0) arrives, that is, at time t4, the MBSFN subframe setting information is valid. And a step of making it.

  In the first feature and the second feature of the present embodiment, the time TB corresponding to the “BCCH modification period (broadcast information change period)” from the timing t4 when the relay node RN validates the setting information of the MBSFN subframe. A step of transmitting a paging message or SIB1 notifying that the content of the broadcast information is changed to the mobile station UE in the cell under the relay node RN from the timing just before, that is, the timing t3 Also good.

  The third feature of the present embodiment is the relay node RN, which receives “RRC Connection Reconfiguration” for notifying the setting information of the MBSFN subframe and a predetermined period from the radio base station DeNB, and “RRC Connection Reconfiguration”. The main point is that the MBSFN subframe setting unit 12 is configured to validate the setting information of the MBSFN subframe at a timing t4 when a predetermined period has elapsed since the reception of the message.

  The fourth feature of the present embodiment is a relay node RN, which receives a “RRC Connection Reconfiguration” that notifies MBSFN subframe setting information from the radio base station DeNB, and then receives a predetermined system frame (for example, a system frame). The gist is to include an MBSFN subframe setting unit 12 configured to validate the setting information of the MBSFN subframe when the transmission / reception timing of (SFN # 0) arrives, that is, at timing t4.

  In the third feature and the fourth feature of the present embodiment, from the timing t3 corresponding to the “BCCH modification period” before the timing t4 for validating the setting information of the MBSFN subframe, that is, from the timing t3, You may provide the transmission part 13 comprised so that the paging message or SIB1 which notifies that the content of alerting | reporting information will change with respect to the mobile station UE in a subordinate cell may be comprised.

  Note that the operations of the mobile station UE, the radio base station DeNB, and the relay node RN described above may be performed by hardware, may be performed by a software module executed by a processor, or may be performed by a combination of both. May be.

  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, the radio base station DeNB, or the relay node RN. Further, the storage medium and the processor may be provided in the mobile station UE, the radio base station DeNB, and the relay node RN as discrete components.

  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 RN ... relay node DeNB ... radio base station 11 ... RRC Connection Reconfiguration processing unit 12 ... MBSFN subframe setting unit 13 ... transmitting unit

Claims (6)

A step in which the radio base station transmits configuration information for notifying setting information and a predetermined period of the MBSFN subframe to the relay node;
And a step of validating the setting information of the MBSFN subframe when the predetermined period has elapsed since the relay node received the configuration information. A step in which a radio base station transmits configuration information for notifying setting information of an MBSFN subframe to a relay node;
And a step of validating the setting information of the MBSFN subframe when the relay node receives transmission / reception timing of a predetermined system frame after receiving the configuration information.   From the timing corresponding to the broadcast information change period before the timing when the relay node makes the setting information of the MBSFN subframe valid, the relay node transmits the broadcast information to the mobile stations in the cell under the relay node. The mobile communication method according to claim 1, further comprising a step of transmitting change notification information for notifying that contents are changed.   When the MBSFN subframe setting information and the configuration information notifying the predetermined period are received from the radio base station, the MBSFN subframe setting information is valid when the predetermined period has elapsed since the reception of the configuration information. A relay node comprising: a setting unit configured to:   After receiving the configuration information for notifying the setting information of the MBSFN subframe from the radio base station, the configuration information of the MBSFN subframe is made valid when the transmission / reception timing of the predetermined system frame arrives. A relay node comprising a setting unit.   Notify the mobile station in the subordinate cell that the content of the broadcast information is changed from the timing corresponding to the broadcast information change period before the timing at which the setting information of the MBSFN subframe is validated. The relay node according to claim 4, further comprising a transmission unit configured to transmit the change notification information to be transmitted.

Images