JP2011004373A - Mobile communication method, radio base station and relay node - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce interference to a receiver of a relay node itself which is caused by a collision between transmission/reception processing by a Un radio bearer and transmission/reception processing by a Uu radio bearer.SOLUTION: The mobile communication method includes a process A in which the relay node RN performs SFN synchronization processing with a radio base station DeNB based upon report information transmitted by the radio base station DeNB, and a process B in which the relay node RN when setting an RRC connection with the radio base station DeNB reports a result of the SFN synchronization processing to the radio base station DeNB.

Description

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

  In an LTE-Advanced mobile communication system, which is a successor of LTE (Long Term Evolution), a function similar to that of the radio base station DeNB is provided between the mobile station UE and the radio base station DeNB (Donor eNB). It can be connected to a “Relay Node (RN) RN”.

  In the LTE-Advanced mobile communication system, an E-RAB (E-UTRAN Radio Access Bearer) is set between the mobile station UE and a core node CN (Core Node), and the mobile station UE and the relay node RN Between the relay node RN and the radio base station DeNB, the Un radio bearer is set, and the S1 bearer is set between the radio base station DeNB and the core node CN. It is configured.

3GPP TS 36.300 (V8.8.0), “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Network 9 H 3GPP TR36.814 (V1.0.0), “Further Advancements for E-UTRA Physical Layer Aspects”, February 2009 3GPP TS36.331 (V8.6.0), “Radio Resource Control (RRC); Protocol specification”, June 2009 3GPP R1-084686, “Updated WF on addressing forward compatibility in Rel-8”, November 2008

  However, in such a mobile communication system, if synchronization is not established between the relay node RN and the radio base station DeNB, the relay node RN receives a downlink signal from the radio base station DeNB (reception process in the Un radio bearer). Between the mobile node UE and the relay node RN to the downlink signal transmission process (transmission process in the Uu radio bearer), or the relay node RN receives the uplink signal from the mobile station UE (reception process in the Uu radio bearer) It is difficult to avoid collision between the relay node RN and the uplink signal transmission process to the radio base station DeNB (transmission process in the Un radio bearer), and the transmission signal of the relay node RN wraps around the receiver of the RN itself There is a problem that the possibility that interference will occur increases.

  Therefore, the present invention has been made in view of the above-described problems, and reduces interference to the receiver of the relay node itself caused by collision between transmission / reception processing in the Un radio bearer and transmission / reception processing in the Uu radio bearer. An object of the present invention is to provide a mobile communication method, a radio base station, and a relay node that can perform communication.

  A first feature of the present invention is a mobile communication method, in which a relay node performs a synchronization process with a radio base station based on broadcast information transmitted by the radio base station; When the relay node establishes a connection with the radio base station, the relay node includes a step B of notifying the radio base station of the result of the synchronization process.

  The second feature of the present invention is a radio base station, and when establishing a connection with a relay node, obtains a result of synchronization processing with the radio base station performed by the relay node. An acquisition unit configured to perform a synchronization processing request unit configured to request the relay node to perform the synchronization processing when the result of the synchronization processing is unsuccessful; The gist is to provide.

  A third feature of the present invention is a relay node, which is configured to perform synchronization processing with a radio base station based on broadcast information transmitted by the radio base station. And a notification unit configured to notify the result of the synchronization processing to the radio base station when setting up a connection with the radio base station. .

  A fourth feature of the present invention is a mobile communication method, in which a relay node starts a radio frame between the relay node and the radio base station based on broadcast information transmitted by the radio base station. A step A of measuring a positional deviation, and a step of notifying the radio base station of a deviation of the start position of the radio frame when the relay node establishes a connection with the radio base station. And B.

  A fifth feature of the present invention is a relay node, which measures a deviation of a start position of a radio frame between the relay node and the radio base station based on broadcast information transmitted by the radio base station. When establishing a connection between the synchronization processing unit configured to do so and the radio base station, the radio base station is configured to notify the radio base station of the deviation of the start position of the radio frame. The notification section is provided.

  As described above, according to the present invention, a mobile communication method capable of reducing interference to the receiver of the relay node itself caused by collision between transmission / reception processing in the Un radio bearer and transmission / reception processing in the Uu radio bearer, A radio base station and a relay node can be provided.

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 which shows an example of a format of "RRC Connection Reconfiguration Complete" in the mobile communication system which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a radio base station 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 mobile communication system which concerns on the modification 1 of the 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the modification 2 of the 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the modification 3 of the 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the modification 4 of the 1st Embodiment of this invention.

(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 is an LTE-Advanced mobile communication system, and includes core nodes (for example, a gateway device S-GW and an exchange MME) in a core network node. , Radio base station DeNB, relay node RN and the like.

  Here, in the example of FIG. 1, a Uu radio bearer is set between the radio base station DeNB and the mobile station UE, and an Un radio bearer is set between the radio base station DeNB and the relay node RN. The Uu radio bearer is set between the relay node RN and the mobile station UE.

  In the mobile communication system according to the present embodiment, the radio base station DeNB and the relay node RN are configured to transmit an uplink signal and a downlink signal by a time division multiplexing method.

  As illustrated in FIG. 2, the relay node RN includes a reception unit 11, a synchronization processing unit 12, a transmission unit 13, and a scheduling unit 14.

  The receiving unit 11 is configured to receive a downlink signal transmitted from the radio base station DeNB via the Un radio bearer and an uplink signal transmitted from the mobile station UE via the Uu radio bearer.

  Further, the receiving unit 11 is configured to receive broadcast information transmitted by the radio base station DeNB and acquire an SFN (System Frame Number) included in the broadcast information.

  Further, the reception unit 21 changes the configuration of the RRC connection set between the relay node RN and the radio base station DeNB when setting the RRC connection between the relay node RN and the radio base station DeNB. At this time, the radio base station DeNB may be configured to acquire the transmission timing of an MBSFN (Multicast Broadcast Single Frequency Network) subframe.

  Here, the MBSFN subframe is a subframe used in MBSFN communication. In this specification, the MBSFN subframe also includes an MBSFN subframe that is defined so as not to transmit a control signal OFDM symbol called a “Blank subframe” in a 3GPP meeting.

  The synchronization processing unit 12 is configured to perform synchronization processing with the radio base station DeNB based on broadcast information transmitted by the radio base station DeNB.

  For example, the synchronization processing unit 12 is configured to perform the SFN synchronization process with the radio base station DeNB based on the broadcast information transmitted by the radio base station DeNB and the transmission timing of the MBSFN subframe.

  Note that such SFN synchronization processing means processing for matching the heads of radio frames specified by the SFN between the relay node RN and the radio base station DeNB.

  The transmission unit 13 is configured to transmit an uplink signal to the radio base station DeNB via the Un radio bearer and to transmit a downlink signal to the mobile station UE via the Uu radio bearer.

  In addition, the transmitter 13 is configured to notify the radio base station DeNB of the result of the SFN synchronization process when setting up an RRC connection between the relay node RN and the radio base station DeNB.

  Specifically, the transmission unit 13 may be configured to notify the radio base station DeNB of the result of the SFN synchronization process by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setting procedure. Good.

  For example, as illustrated in FIG. 3, the transmission unit 13 may set the result (success / failure) of the SFN synchronization process in the information element “noncriticalExtensions” (Z) in the “RRC Connection Reconfiguration Complete”.

  The scheduling unit 14 is configured to perform scheduling related to the mobile station UE under the relay node RN.

  For example, the scheduling unit 14 may be configured to perform scheduling so that a downlink signal is transmitted at a timing other than the transmission timing of the MBSFN subframe.

  As illustrated in FIG. 4, the radio base station DeNB includes a transmission unit 21, a reception unit 22, and a scheduling unit 23.

  The transmission unit 21 transmits a downlink signal to the relay node RN via the Un radio bearer, transmits a downlink signal to the mobile station UE via the Uu radio bearer, and transmits an uplink signal to the core node CN. Is configured to do.

  Moreover, the transmission part 21 is comprised so that the alerting | reporting information containing above-mentioned SFN may be transmitted in the cell of the radio base station DeNB.

  Note that the transmission unit 12 may be configured to notify the relay node RN of the transmission timing of the MBSFN subframe described above.

  The receiving unit 22 receives an uplink signal transmitted from the relay node RN via the Un radio bearer, an uplink signal transmitted from the mobile station UE via the Uu radio bearer, and a downlink signal transmitted from the core node CN. It is configured as follows.

  For example, the receiving unit 22 receives “RRC Connection Reconfiguration Complete” transmitted from the relay node RN in the procedure of setting the RRC connection between the radio base station DeNB and the relay node RN, and receives the “RRC Connection Reconfiguration Complete” from the “RRC Connection Reconfiguration Complete”. The result of the SFN synchronization process described above may be acquired.

  The scheduling unit 23 is configured to perform scheduling related to the relay node RN and the mobile station UE under the radio base station DeNB.

  Specifically, the scheduling unit 23 may be configured to perform scheduling so that a downlink signal is transmitted at the transmission timing of the MBSFN subframe.

(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.

  As illustrated in FIG. 5, in step S1001, the relay node RN transmits “RRC Connection Request” to the radio base station DeNB at the time of activation.

  In step S1002, the radio base station DeNB transmits “RRC Connection Setup” to the relay node RN.

  In Step S1003, the relay node RN transmits “RRC Connection Setup Complete” including “Attach Request” to the radio base station DeNB.

  In step S1004, the radio base station DeNB transmits “Initial UE Message” including “Attach Request” to the core node CN.

  In step S1005, after the “Authentication / Security process” is completed between the relay node RN and the core node CN, in step S1006, the core node CN makes a “Initial Context” including “Attach Accept” to the radio base station DeNB. Send a “Setup Request”.

  In step S1007, the radio base station DeNB transmits “RRC RN (UE) Capability Enquiry” to the relay node RN.

  In Step S1008, the relay node RN transmits “RRC RN (UE) Capability Information” to the radio base station DeNB.

  In step S1009, the radio base station DeNB transmits “(UE) Capability Info Indication” to the core node CN.

  The radio base station DeNB transmits “Security Mode Command” to the relay node RN in Step S1010, and transmits “RRC Connection Reconfiguration” including “Attach Accept” in Step S1011.

  Here, the radio base station DeNB may notify the relay node RN of the transmission timing of the above MBSFN subframe by “RRC Connection Reconfiguration”.

  In step S1012, the relay node RN transmits “Security Mode Complete” to the radio base station DeNB, and in step S1013, transmits “RRC Connection Reconfiguration Complete”.

  Here, the relay node RN performs SFN synchronization processing performed on the radio base station DeNB based on the broadcast information transmitted by the radio base station DeNB and the transmission timing of the MBSFN subframe by “RRC Connection Reconfiguration Complete”. Notify the result of.

  In step S1014, the radio base station DeNB transmits “Initial Context Setup Response” to the core node CN.

  In step S1015, the relay node RN transmits “Attach Complete” to the core node CN.

(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, the radio base station DeNB can recognize whether or not SFN synchronization is established between the relay node RN and the radio base station DenB. By controlling resources in the relay node RN, it is possible to reduce the occurrence of interference in the resource node RN.

(Modification 1)
With reference to FIG. 6, a mobile communication system according to Modification 1 of the first embodiment of the present invention will be described. Hereinafter, the mobile communication system according to the first modification will be described by focusing on the differences from the above-described mobile communication system according to the first embodiment of the present invention.

  In the mobile communication system according to the first modification example, the transmission unit 13 of the relay node RN performs the above-described SFN synchronization process on the radio base station DeNB by “Un Setup Request” instead of “RRC Connection Reconfiguration Complete”. The result may be notified.

  The “Un Setup Request” is not defined in the existing RRC connection setting procedure, but is a signal used in a procedure newly defined between the radio base station DeNB and the relay node RN.

  Further, the reception unit 22 of the radio base station DeNB may be configured to acquire the result of the SFN synchronization process in the relay node RN from the above-described “Un Setup Request”.

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

  As shown in FIG. 6, the operations in steps S2001 to S2015 are the same as the operations in steps S1001 to S1015 shown in FIG. However, in step S2011, the relay node RN does not notify the radio base station DeNB of the result of the SFN synchronization process in the relay node RN by “RRC Connection Reconfiguration Complete”.

  In step S2016, the relay node RN transmits to the radio base station DeNB “Un Setup Request” requesting to set up an Un radio bearer between the relay node RN and the radio base station DeNB.

  Here, the relay node RN notifies the radio base station DeNB of the result of the SFN synchronization processing in the relay node RN by “Un Setup Request”.

  In step S2017, the radio base station DeNB transmits “Un Setup Response” to the relay node RN.

(Modification 2)
With reference to FIG. 7, a mobile communication system according to Modification 2 of the first embodiment of the present invention will be described. Hereinafter, the mobile communication system according to the second modification will be described by focusing on differences from the above-described mobile communication system according to the first embodiment of the present invention.

  In the mobile communication system according to this modification, the transmission unit 13 of the relay node RN performs the above-described SFN synchronization process on the radio base station DeNB by “Un RN Configuration Indication” instead of “RRC Connection Reconfiguration Complete”. The result may be notified.

  “Un RN Configuration Indication” is not defined in the existing RRC connection setting procedure, but is a signal used in a procedure newly defined between the radio base station DeNB and the relay node RN.

  Further, the reception unit 22 of the radio base station DeNB may be configured to acquire the result of the SFN synchronization process in the relay node RN from the above-described “Un RN Configuration Indication”.

  Hereinafter, with reference to FIG. 27, the operation of the mobile communication system according to the first modification will be described.

  As shown in FIG. 7, the operations in steps S3001 to S3015 are the same as the operations in steps S1001 to S1015 shown in FIG. However, in step S3011, the relay node RN does not notify the radio base station DeNB of the result of the SFN synchronization processing in the relay node RN by “RRC Connection Reconfiguration Complete”.

  In step S3016, the relay node RN notifies the radio base station DeNB of “Un RN Configuration Indication” that notifies the configuration of the Un radio bearer as a radio relay base station between the relay node RN and the radio base station DeNB. Send.

  Here, the relay node RN notifies the radio base station DeNB of the result of the SFN synchronization process in the relay node RN by “Un RN Configuration Indication”.

(Modification 3)
With reference to FIG. 8, a mobile communication system according to Modification 3 of the first embodiment of the present invention is described. Hereinafter, the mobile communication system according to the third modification will be described by focusing on differences from the above-described mobile communication system according to the first embodiment of the present invention.

  In the mobile communication system according to the third modification, when the transmission unit 21 of the radio base station DeNB detects that the result of the SFN synchronization process by the relay node RN is failure, the SFN synchronization process is performed on the relay node RN. Is configured to request to do.

  Specifically, the transmission unit 21 may be configured to request to perform the SFN synchronization process by a signal for changing the configuration of the RRC connection, for example, “RRC Connection Reconfiguration”.

  With reference to FIG. 8, the operation of the mobile communication system according to the third modification will be described.

  As illustrated in FIG. 8, when the radio base station DeNB detects a predetermined trigger in step S4001, in step S4002, the radio base station DeNB selects “RRC for changing the configuration of the RRC connection that has already been set for the relay node RN. "Connection Reconfiguration" is transmitted.

  Here, the radio base station DeNB requests the relay node RN to perform the SFN synchronization process by “RRC Connection Reconfiguration”.

  In Step S4003, the relay node RN performs SFN synchronization processing with the radio base station DeNB, and transmits “RRC Connection Reconfiguration Complete” including the result of the SFN synchronization processing to the radio base station DeNB.

(Modification 4)
With reference to FIG. 9, a mobile communication system according to Modification 4 of the first embodiment of the present invention is described. Hereinafter, the mobile communication system according to the first modification will be described by focusing on the differences from the above-described mobile communication system according to the first embodiment of the present invention.

  In the mobile communication system according to the third modification, when the transmission unit 21 of the radio base station DeNB detects that the result of the SFN synchronization process by the relay node RN is failure, the SFN synchronization process is performed on the relay node RN. Is configured to request to do.

  Specifically, the transmission unit 21 may be configured to request to perform the SFN synchronization process by a signal for changing the configuration of the RRC connection, for example, “Un RN Reconfiguration”.

  “Un RN Reconfiguration” is a signal used in a procedure newly defined between the radio base station DeNB and the relay node RN.

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

  As illustrated in FIG. 9, when the radio base station DeNB detects a predetermined trigger in step S5001, in step S5002, the radio base station DeNB sets “Un” for changing the configuration of the RRC connection that has already been set for the relay node RN. RN Reconfiguration "is transmitted.

  Here, the radio base station DeNB requests the relay node RN to perform the SFN synchronization process by “Un RN Reconfiguration”.

  In step S5003, the relay node RN performs an SFN synchronization process with the radio base station DeNB, and transmits “Un RN Reconfiguration Complete” including the result of the SFN synchronization process to the radio base station DeNB.

  “Un RN Reconfiguration Complete” is a signal used in a procedure newly defined between the radio base station DeNB and the relay node RN.

(Modification 5)
Hereinafter, the mobile communication system according to the fifth modification of the first embodiment of the present invention will be described by focusing on differences from the above-described mobile communication system according to the first embodiment of the present invention.

  Instead of performing SFN synchronization processing between the radio base station DeNB and the relay node RN based on the broadcast information transmitted by the radio base station DeNB, the synchronization processing unit 12 of the relay node RN transmits the relay node RN. The number of frames of the SFN of the radio frame to be transmitted and the SFN of the radio frame transmitted by the second radio base station S-DeNB at the same time (SFN between the relay node RN and the second radio base station S-DeNB ( It may be configured to measure a deviation of the start position (radio frame) of the radio frame and notify the radio base station DeNB of the measurement result using “RRC Connection Reconfiguration Complete” or the like.

  Further, the reception unit 22 of the radio base station DeNB transmits the SFN of the radio frame transmitted by the relay node RN and the radio transmitted by the second radio base station S-DeNB from the “RRC Connection Reconfiguration Complete” transmitted by the relay node RN. It may be configured to acquire how many frames are deviated from the SFN of the frame at the same time (SFN deviation between the relay node RN and the second radio base station S-DeNB).

  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 relay node RN performs SFN synchronization processing (synchronization) with a radio base station DeNB based on broadcast information transmitted by the radio base station DeNB. Step A for performing processing) and Step B for notifying the radio base station DeNB of the result of the SFN synchronization processing when the relay node RN sets up an RRC connection (connection) with the radio base station DeNB. It is summarized as having.

  In the first feature of the present embodiment, in step B, the relay node RN transmits the result of the SFN synchronization process to the radio base station DeNB by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setup procedure. You may be notified.

  In the first feature of the present embodiment, the radio base station DeNB further includes a step C for requesting the relay node RN to perform the SFN synchronization process when the result of the SFN synchronization process is unsuccessful. Also good.

  In the first feature of the present embodiment, in step C, the radio base station DeNB requests to perform the SFN synchronization process by a signal for changing the configuration of the RRC connection, for example, “RRC Connection Reconfiguration”. Also good.

  The second feature of the present embodiment is the radio base station DeNB, which is the SFN synchronization with the radio base station DeNB performed by the relay node RN when setting up the RRC connection with the relay node RN. When the result of the SFN synchronization process is unsuccessful with the receiving unit 22 configured to acquire the processing result, the relay node RN is configured to request the SFN synchronization process to be performed. The gist is that the transmitter 21 is provided.

  In the second feature of the present embodiment, the receiving unit 22 may be configured to acquire the result of the SFN synchronization processing from “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setting procedure.

  In the second feature of the present embodiment, the transmission unit 21 is configured to request to perform SFN synchronization processing by a signal for changing the configuration of the RRC connection, for example, “RRC Connection Reconfiguration”. Also good.

  A third feature of the present embodiment is a relay node RN, which is configured to perform SFN synchronization processing with the radio base station DeNB based on broadcast information transmitted by the radio base station DeNB. When the RRC connection is established between the synchronization processing unit 12 and the radio base station DeNB, the transmission unit 13 configured to notify the radio base station DeNB of the result of the SFN synchronization process. The gist is to provide.

  In the third feature of the present embodiment, the transmission unit 13 notifies the radio base station DeNB of the result of the SFN synchronization process by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setting procedure. It may be configured.

  A fourth feature of the present embodiment is a mobile communication method, in which the relay node RN is based on broadcast information transmitted by the radio base station DeNB, and the SFN between the relay node RN and the radio base station DeNB. When the relay node RN sets up the RRC connection with the radio base station DeNB, the process A for measuring the difference between the relay node RN and the radio base station DeNB (step A). And a step B of notifying the radio base station DeNB of the above SFN shift.

  In the fourth feature of the present embodiment, in step B, the relay node RN causes the above-described SFN shift to the radio base station DeNB by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setup procedure. You may be notified.

  A fifth feature of the present embodiment is a relay node RN, which is configured to measure the above-described SFN deviation based on broadcast information transmitted by the radio base station DeNB. And a transmission unit 13 configured to notify the radio base station DeNB of the above-described SFN deviation when setting up an RRC connection with the radio base station DeNB. And

  In the fifth feature of the present embodiment, the transmission unit 13 notifies the radio base station DeNB of the above-described SFN deviation by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setup procedure. It may be configured.

  The operations of the radio base station DeNB, the relay node RN, the core node CN, and the mobile station UE described above may be implemented by hardware, may be implemented by a software module executed by a processor, It may be implemented by a combination.

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

  Although the present invention has been described in detail using the above-described embodiment, it is obvious for those skilled in the art that the present invention is not limited to the embodiment described in the present 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.

RN ... relay node 11 ... reception unit 12 ... synchronization processing unit 13 ... transmission unit 14 ... scheduling unit DeNB ... radio base station 21 ... transmission unit 22 ... reception unit 23 ... scheduling unit

Claims (15)

Step A in which the relay node performs synchronization processing with the radio base station based on the broadcast information transmitted by the radio base station;
A mobile communication method comprising: a step B of notifying a result of the synchronization processing to the radio base station when the relay node establishes a connection with the radio base station. The connection is an RRC connection,
In the step B, the relay node notifies the radio base station of the result of the synchronization process by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setup procedure. Item 2. The mobile communication method according to Item 1.   2. The movement according to claim 1, further comprising a step C of requesting the relay node to perform the synchronization processing when the result of the synchronization processing is a failure. Communication method.   The mobile communication method according to claim 3, wherein in the step C, the radio base station requests to perform the synchronization process by a signal for changing the configuration of the connection. The connection is an RRC connection,
The mobile communication method according to claim 4, wherein the signal is "RRC Connection Reconfiguration". A wireless base station,
An acquisition unit configured to acquire a result of a synchronization process with the radio base station performed by the relay node when setting up a connection with the relay node;
A radio base station, comprising: a synchronization processing request unit configured to request the relay node to perform the synchronization processing when a result of the synchronization processing fails. The connection is an RRC connection,
The radio base according to claim 6, wherein the acquisition unit is configured to acquire the result of the synchronization process from "RRC Connection Reconfiguration Complete" transmitted in the RRC connection setting procedure. Bureau.   The radio base station according to claim 6, wherein the synchronization processing request unit is configured to request to perform the synchronization processing by a signal for changing the configuration of the connection. The connection is an RRC connection,
The radio base station according to claim 8, wherein the signal is “RRC Connection Reconfiguration”. A relay node,
A synchronization processing unit configured to perform synchronization processing with the radio base station based on broadcast information transmitted by the radio base station;
A relay node configured to notify the radio base station of the result of the synchronization process when setting up a connection with the radio base station; . The connection is an RRC connection,
The notification unit is configured to notify the radio base station of the result of the synchronization process by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setup procedure. The relay node according to claim 10. A step in which the relay node measures a deviation of a head position of a radio frame between the relay node and the radio base station based on broadcast information transmitted by the radio base station;
The relay node comprises a step B of notifying a deviation of a start position of the radio frame to the radio base station when setting up a connection with the radio base station. Communication method. The connection is an RRC connection,
In the step B, the relay node notifies the radio base station of the deviation of the start position of the radio frame by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setup procedure. The mobile communication method according to claim 12. A relay node,
A synchronization processing unit configured to measure a deviation of a start position of a radio frame between the relay node and the radio base station based on broadcast information transmitted by the radio base station;
A notification unit configured to notify the radio base station of a shift in the start position of the radio frame when setting up a connection with the radio base station; Relay node to perform. The connection is an RRC connection,
The notifying unit is configured to notify the radio base station of the deviation of the start position of the radio frame by “RRC Connection Reconfiguration Complete” transmitted in the RRC connection setting procedure. The relay node according to claim 14, characterized in that:

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