JP2011238978A - Mobile communication method, relay node and radio base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To synchronize timing to make a change of sub-frame configuration effective between a radio base station DeNB and a relay node.SOLUTION: A mobile communication method of the invention includes a step of starting to receive downlink data with use of an "old configuration" and a "new configuration" after a relay node RN has extracted and stored the "new configuration" from an "RRC connection recognition", and after having started reception of the downlink data with use of the "old configuration" and the "new configuration", when a second "BCC modification period (n+1)" has been started, starting to receive the downlink data with use of the "new configuration."

Description

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

  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 2 months); 3GPP TR36.912, “Feasibility study for Further Advancements for E-UTRA (LTE-Advanced)”, March 2010

  However, in the conventional mobile communication system, when the radio base station DeNB instructs the relay node RN to change the subframe configuration in the Un interface, such as the setting of the MBSFN subframe, the radio base station DeNB There is a problem in that it is not possible to synchronize with the relay node RN about the timing for enabling the change of the subframe configuration.

  Specifically, as illustrated in FIG. 6, in step S3001, the radio base station DeNB transmits “RRC Connection Reconfiguration” including “new configuration” to the relay node RN, and in step S3002, the relay node The RN transmits “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  Here, from the time point t3 when the radio base station DeNB receives the “RRC Connection Reconfiguration Complete”, the relay node RN starts the transmission of downlink data using the “new configuration”, whereas the relay node RN performs the “RRC Connection Receiving downlink data using “new configuration” is started from time t1 when “new configuration” is extracted and stored from “Reconfiguration”.

  Therefore, as illustrated in FIG. 6, when the radio base station DeNB transmits downlink data using “old configuration” at t2, the relay node RN can receive the downlink data. There was a problem of disappearing.

  Therefore, the present invention has been made in view of the above-described problems, and a mobile communication method capable of synchronizing the timing for enabling the change of the subframe configuration between the radio base station DeNB and the relay node RN. An object is to provide a relay node and a radio base station.

  A first feature of the present invention is a mobile communication method for transmitting and receiving downlink data using a subframe configuration between a relay node and a radio base station, wherein the mobile communication method is between the radio base station and the relay node. The radio base station transmits a reconfiguration signal including the second subframe configuration to the relay node when downlink data is transmitted / received using the first subframe configuration in FIG. The relay node extracts and stores the second subframe configuration from the reconstructed signal, and then starts receiving downlink data using the first subframe configuration and the second subframe configuration; Transmitting a response signal to the reconfigured signal to the radio base station; and when the radio base station receives the response signal, a downlink signal using the second subframe configuration. A second broadcast information change period starts after the relay node starts receiving downlink data using the first subframe configuration and the second subframe configuration. In this case, the present invention includes a step of starting reception of downlink data using the second subframe configuration.

  A second feature of the present invention is a relay node configured to receive downlink data transmitted by a radio base station using a subframe configuration, and a downlink using the first subframe configuration When receiving data, the radio base station is configured to receive a reconfiguration signal including a second subframe configuration, and extracts the second subframe configuration from the reconfiguration signal. To store downlink data using the first subframe configuration and the second subframe configuration, and to transmit a response signal to the reconfiguration signal to the radio base station. A second broadcast information change period starts after reception of downlink data using the first subframe configuration and the second subframe configuration is started. When the it is a gist that is configured to start receiving the downlink data using the second sub-frame configuration.

  A third feature of the present invention is a mobile communication method for transmitting and receiving downlink data using a subframe configuration between a relay node and a radio base station, wherein the mobile communication method is between the radio base station and the relay node. Step A in which the radio base station transmits a reconfiguration signal including the second subframe configuration to the relay node when downlink data transmission / reception using the first subframe configuration is performed in FIG. And, after the relay node extracts and stores the second subframe configuration from the reconstructed signal, the second subframe configuration instead of receiving downlink data using the first subframe configuration. Step B for starting reception of downlink data using, and transmitting a response signal to the reconfiguration signal to the radio base station, and the radio base station transmitting the reconfiguration signal Until the response signal is received, step C for transmitting downlink data using the first subframe configuration and the second subframe configuration, and the radio base station receives the response signal A step D of starting transmission of downlink data using the second subframe configuration, wherein, in the step C, the radio base station includes the first subframe configuration and the second subframe configuration. The gist is that the downlink data is transmitted only in the subframe set as the MBSFN subframe by both of the configurations.

  A fourth feature of the present invention is a radio base station configured to transmit downlink data to a relay node using a subframe configuration, wherein the first subframe configuration is configured for the relay node. Is configured to transmit a reconfiguration signal including the second subframe configuration to the relay node when transmitting downlink data using the Until the response signal of the reconstructed signal is received, downlink data is transmitted using the first subframe configuration and the second subframe configuration, and when the response signal is received, The transmission is configured to start transmission of downlink data using a two-subframe configuration, and the first signal is transmitted from the time when the reconfiguration signal is transmitted until the response signal of the reconfiguration signal is received. It is summarized as configured by both subframe structure and the second sub-frame configured only to transmit the downlink data in a sub-frame to be set as the MBSFN subframes.

  As described above, according to the present invention, the mobile communication method, the relay node, and the radio base that can synchronize the timing for enabling the change of the subframe configuration between the radio base station DeNB and the relay node RN. A station 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. FIG. 3 is a functional block diagram of a radio base station 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 figure for demonstrating operation | movement of the mobile communication system which concerns on the 2nd 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 radio base station DeNB and a relay node RN. Here, in the mobile communication system according to the present embodiment, the radio base station DeNB and the relay node RN are connected by a Un interface, and the relay node RN and the mobile station UE are connected by a Uu interface. Has been.

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

  The management unit 11 is configured to manage a subframe configuration (configuration) in the Un interface, a subframe configuration (configuration) in the Uu interface, and the like.

  Here, the subframe configuration in the Un interface includes information on subframes set as MBSFN subframes.

  The receiving unit 12 is configured to receive, from the radio base station DeNB, “RRC Connection Reconfiguration” including “new configuration” indicating a reset value such as subframe information set as an MBSFN subframe. .

  The transmission unit 13 is configured to transmit “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  Here, when receiving downlink data using “old configuration” indicating information of a subframe set as an MBSFN subframe, the reception unit 12 receives “new” from the radio base station DeNB. When “RRC Connection Reconfiguration” including “configuration” is received, “new configuration” is extracted from “RRC Connection Reconfiguration” and stored in the management unit 11, and then “old configuration” and “new configuration” are used. It is configured to start receiving data.

  At this time, the transmission unit 13 is configured to transmit “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  In addition, the reception unit 12 receives “RRC Connection Reconfiguration”, and after receiving downlink data using “old configuration” and “new configuration”, the second “BCCH modification period (n + 1)” is received. When started, it is configured to start receiving downlink data using “new configuration”.

  Here, the transmission unit 13 may be configured to start transmission of downlink data using “new configuration” to the mobile station UE when “BCCH modification period (n + 1)” starts.

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

  The management unit 21 is configured to manage a subframe configuration or the like in the Un interface.

  The transmission unit 22 is configured to transmit “RRC Connection Reconfiguration” including “new configuration” to the relay node RN.

  The receiving unit 23 is configured to receive “RRC Connection Reconfiguration Complete” from the relay node RN.

  Here, when the receiving unit 23 receives “RRC Connection Reconfiguration Complete” from the relay node RN, the transmitting unit 22 uses “new configuration” instead of downlink data transmission using “old configuration”. It is comprised so that transmission of the downlink data using may be started.

  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 S1001, the radio base station DeNB transmits “RRC Connection Reconfiguration” including “new configuration” such as setting information of the MBSFN subframe to the relay node RN.

  In Step S1002, the relay node RN transmits “HARQ-Ack” for the downlink signal including “RRC Connection Reconfiguration” to the radio base station DeNB.

  Thereafter, in step S1003, the relay node RN transmits “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  In step S1004, the radio base station DeNB transmits “HARQ-Ack” for the uplink signal including “RRC Connection Reconfiguration Complete” to the relay node RN.

  Here, when the radio base station DeNB receives “RRC Connection Reconfiguration Complete” from the relay node RN, at t3, the radio base station DeNB starts transmission of downlink data using “new configuration”.

  On the other hand, the relay node RN extracts “new configuration” from “RRC Connection Reconfiguration” and stores it in the management unit 11, and then receives downlink data using “old configuration” and “new configuration” at t 1. Start.

  Thereafter, the relay node RN starts receiving downlink data using “old configuration” and “new configuration”, and then starts the second “BCCH modification period (n + 1)”. The reception of downlink data using “new configuration” is started.

  Note that “BCCH modification period (n)” starts at t2.

  Here, from t2, the relay node RN transmits 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.

  That is, the relay node RN starts to receive downlink data using “old configuration” and “new configuration” and then changes the content of the broadcast information in “BCCH modification period (n)” that starts first. A paging message or SIB1 notifying that

  Thereafter, the relay node RN transmits the changed broadcast information (“Updated information”) in “BCCH modification period (n + 1)”.

  According to the system for mobile communication according to the present embodiment, the relay node RN starts reception of downlink data using “old configuration” and “new configuration” at t1, and the radio base station DeNB performs “ After transmission of downlink data using “new configuration” is started, since reception of downlink data using “new configuration” is started at t4, the radio base station DeNB and the relay node It is possible to synchronize with the RN about the timing for enabling the change of the subframe configuration.

(Mobile communication system according to the second embodiment of the present invention)
With reference to FIG. 5, 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 receiving unit 12 of the relay node RN uses “new configuration” instead of receiving downlink data using “old configuration” after extracting and storing “new configuration” from “RRC Connection Reconfiguration”. It is configured to start receiving downlink data.

  The transmission unit 22 of the radio base station DeNB transmits downlink data using “old configuration” and “new configuration” until “RRC Connection Reconfiguration Complete” is received after “RRC Connection Reconfiguration” is transmitted. It is configured to send.

  The radio base station DeNB is also configured to start transmission of downlink data using “new configuration” when the transmission unit 22 receives “RRC Connection Reconfiguration Complete”.

  Here, while transmitting the downlink data using “old configuration” and “new configuration”, the transmitting unit 22 of the radio base station DeNB performs MBSFN by both “old configuration” and “new configuration”. It is configured to transmit downlink data only in subframes set as subframes.

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

  Here, when the radio base station DeNB transmits “RRC Connection Reconfiguration” to the relay node RN, the radio base station DeNB starts transmission of downlink data using “old configuration” and “new configuration” at t1.

  After that, the relay node RN extracts and stores “new configuration” from “RRC Connection Reconfiguration”, and then uses “new configuration” instead of receiving downlink data using “old configuration” at t3. Start receiving the received downlink data.

  After that, when the radio base station DeNB receives “RRC Connection Reconfiguration Complete” from the relay node RN, at t4, instead of transmitting downlink data using “old configuration” and “new configuration”, “new” The transmission of downlink data using “configuration” is started.

  The radio base station DeNB transmits downlink data only in subframes set as MBSFN subframes by both “old configuration” and “new configuration” from t1 to t4.

  According to the system for mobile communication according to the present embodiment, the radio base station DeNB is only a subframe set as an MBSFN subframe by both “old configuration” and “new configuration” during the period from t1 to t4. After transmitting downlink data and starting transmission of downlink data using “new configuration” by the relay node RN, at t4, reception of downlink data using “new configuration” is started. Since it is configured, it is possible to synchronize the timing for enabling the change of the subframe configuration between the radio base station DeNB and the relay node RN.

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

  A first feature of the present embodiment is a mobile communication method, in which downlink data is transmitted / received using “configuration (subframe configuration)” between the relay node RN and the radio base station DeNB. When the downlink data transmission / reception using “old configuration (first subframe configuration)” is performed between the radio base station DeNB and the relay node RN, the radio base station DeNB The step of transmitting “RRC Connection Reconfiguration (reconfiguration signal)” including “new configuration (second subframe configuration)” to the node RN, and the relay node RN from “RRC Connection Reconfiguration” to “new After extracting and storing “configuration”, reception of downlink data using “old configuration” and “new configuration” is started, and “RCC Connection Reconfiguration Complete (response to reconfiguration signal) is transmitted to radio base station DeNB. Signal) ”and when the radio base station DeNB receives“ RRC Connection Reconfiguration Complete ”,“ new configuration ”was used instead of downlink data transmission using“ old configuration ”. The step of starting transmission of downlink data and the relay node RN performs “old configuration”. Start reception of downlink data using “new configuration” when the second “BCCH modification period (n + 1)” starts after starting reception of downlink data using “new configuration” And having a process.

  In the first feature of the present embodiment, the relay node RN may include a step of starting transmission of downlink data using “new configuration” when “BCCH modification period (n + 1)” is started. Good.

  A second feature of the present embodiment is a relay node RN configured to receive downlink data transmitted by the radio base station DeNB using “configuration”, and uses “old configuration”. When receiving downlink data, it is configured to receive “RRC Connection Reconfiguration” including “new configuration” from the radio base station DeNB, and from “RRC Connection Reconfiguration” to “new configuration”. After extracting and storing, start receiving downlink data using “old configuration” and “new configuration”, It is configured to transmit "RRC Connection Reconfiguration Complete" to the line base station DeNB, and after receiving downlink data using "old configuration" and "new configuration", the second " The gist is that it is configured to start reception of downlink data using “new configuration” when “BCCH modification period (n + 1)” is started.

  In the second feature of the present embodiment, when “BCCH modification period (n + 1)” is started, transmission of downlink data using “new configuration” may be started.

  A third feature of the present embodiment is a mobile communication method for transmitting and receiving downlink data using “configuration” between the relay node RN and the radio base station DeNB, and the radio base station DeNB and the relay node RN. When downlink data transmission / reception using “old configuration” is performed between the radio base station DeNB and the relay node RN, the radio base station DeNB transmits “RRC Connection Reconfiguration” including “new configuration”. After the process A and the relay node RN extract and store “new configuration” from “RRC Connection Reconfiguration”, the downstream node using “old configuration” Instead of receiving link data, process B for starting downlink data reception using “new configuration” and transmitting “RRC Connection Reconfiguration Complete” to the radio base station DeNB, and the radio base station DeNB, Between transmitting “RRC Connection Reconfiguration” and receiving “RRC Connection Reconfiguration Complete”, process C for transmitting downlink data using “old configuration” and “new configuration” and radio base station DeNB Receives "RRC Connection Reconfiguration Complete" The base station DeNB starts the transmission of downlink data using “new configuration”. In step C, the radio base station DeNB uses both the “old configuration” and the “new configuration” to perform MBSFN sub-transmission. The gist is to transmit downlink data only in a subframe set as a frame.

  A fourth feature of the present embodiment is a radio base station DeNB configured to transmit downlink data to the relay node RN using “configuration”, and the “old” to the relay node RN. When downlink data is transmitted using “configuration”, the relay node is configured to transmit “RRC Connection Reconfiguration” including “new configuration” to the relay node, and “RRC Connection Reconfiguration”. Until the “RRC Connection Reconfiguration Complete” is received after the transmission of “old configuration” and “new c” It is configured to start transmission of downlink data using “new configuration” when receiving “RRC Connection Reconfiguration Complete”, by transmitting downlink data using “configuration”, and “RRC Connection Reconfiguration Complete”. Between transmitting “Reconfiguration” and receiving “RRC Connection Reconfiguration Complete”, downlink data is transmitted only in subframes set as MBSFN subframes by both “old configuration” and “new configuration”. It is summarized as follows.

  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, 21 ... management unit 12, 23 ... reception unit 13, 22 ... transmission unit

Claims (6)

A mobile communication method for transmitting and receiving downlink data using a subframe configuration between a relay node and a radio base station,
When downlink data transmission / reception using the first subframe configuration is performed between the radio base station and the relay node, the radio base station transmits a second subframe to the relay node. Transmitting a reconfiguration signal including the configuration;
After the relay node extracts and stores the second subframe configuration from the reconfiguration signal, the relay node starts receiving downlink data using the first subframe configuration and the second subframe configuration, and Transmitting a response signal to the reconfiguration signal to the radio base station;
When the radio base station receives the response signal, starts transmitting downlink data using the second subframe configuration;
When the relay node starts receiving downlink data using the first subframe configuration and the second subframe configuration, and when the second broadcast information change period starts, the second subframe configuration And a step of starting reception of downlink data using the mobile communication method.   The relay node according to claim 1, further comprising a step of starting transmission of downlink data using the second subframe configuration when the second broadcast information change period starts. Mobile communication method. A relay node configured to receive downlink data transmitted by a radio base station using a subframe configuration,
When receiving downlink data using the first subframe configuration, the wireless base station is configured to receive a reconfiguration signal including the second subframe configuration,
After extracting and storing the second subframe configuration from the reconstructed signal, reception of downlink data using the first subframe configuration and the second subframe configuration is started, and the radio base station And configured to transmit a response signal to the reconstructed signal,
The downlink using the second subframe configuration when the second broadcast information change period starts after starting the reception of downlink data using the first subframe configuration and the second subframe configuration A relay node configured to start receiving data.   The relay node according to claim 3, wherein the relay node is configured to start transmission of downlink data using the second subframe configuration when the second broadcast information change period starts. . A mobile communication method for transmitting and receiving downlink data using a subframe configuration between a relay node and a radio base station,
When downlink data transmission / reception using the first subframe configuration is performed between the radio base station and the relay node, the radio base station transmits a second subframe to the relay node. Sending a reconfiguration signal including the configuration; and
After the relay node extracts and stores the second subframe configuration from the reconstructed signal, the second subframe configuration is used instead of downlink data reception using the first subframe configuration. Starting reception of downlink data, and transmitting a response signal to the reconfiguration signal to the radio base station;
Step C of transmitting downlink data using the first subframe configuration and the second subframe configuration from when the radio base station transmits the reconfiguration signal to when the response signal is received When,
The wireless base station, when receiving the response signal, has a step D of starting transmission of downlink data using the second subframe configuration,
In the step C, the radio base station transmits the downlink data only in a subframe set as an MBSFN subframe by both the first subframe configuration and the second subframe configuration. Mobile communication method. A radio base station configured to transmit downlink data to a relay node using a subframe configuration,
When transmitting downlink data using the first subframe configuration to the relay node, the relay node is configured to transmit a reconfiguration signal including the second subframe configuration to the relay node. And
The transmission of the downlink data using the first subframe configuration and the second subframe configuration is performed from the transmission of the reconfiguration signal to the reception of the response signal of the reconfiguration signal, and the response signal Is configured to start transmission of downlink data using the second subframe configuration when receiving
From the time when the reconfiguration signal is transmitted until the response signal of the reconfiguration signal is received, only in the subframe set as the MBSFN subframe by both the first subframe configuration and the second subframe configuration A radio base station configured to transmit the downlink data.

Images