Abstract:
The disclosure claims a method and a device for configuring cell parameters of a Relay Node (RN), which can solve the technical problem that the cell parameters cannot be reasonably configured as a Donor eNB (DeNB) does not know the cell amount of the RN. In the disclosure, the RN sends the cell amount of cells which are managed by the RN to the DeNB via a control signaling, so as to make the DeNB more reasonably configure the cell parameters of the RN. The disclosure solves the problem that the DeNB cannot reasonably allocate resources according to the cell amount of the RN, and avoids resources conflicts, wherein the resources contain an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Cell Global Identifier (ECGI), a Physical Cell ID (PCI) and the like.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a National Phase Application of PCT International Application No. PCT/CN2011/079393, International Filing Date Sep. 6, 2011, claiming priority of Chinese Patent Application No. 201010535957.8, filed Nov. 8, 2010, which is hereby incorporated by reference. 
     FIELD OF THE INVENTION 
     The disclosure relates to the field of wireless communication technology, and in particular relates to a method and device for configuring cell parameters of a Relay Node (abbreviated as RN). 
     BACKGROUND OF THE INVENTION 
     In order to satisfy the increasing requirements of the large bandwidth high-speed mobile access, the Third Generation Partnership Projects (abbreviated as 3GPP) put forward a Long-Term Evolution advance (abbreviated as LTE-Advanced) standard. The LTE-Advanced reserves a core of a Long-Term Evolution (abbreviated as LTE) for the evolution of the LTE, and adopts a series of techniques to expand the frequency domain and the space domain based on the above, so as to realize the purpose of improving the utilization ratio of the spectrum, and increasing the system capacity and the like. 
     The Wireless Relay technique, namely, one of the LTE-Advanced techniques, aims at expanding the cell coverage area, reducing the blind angle (or dead angle) area in communication, balancing the load, transferring the service in the hotspot area, and saving the transmitting power of the User Equipment (abbreviated as UE). As shown in  FIG. 1 , the RN provides the functions and services similar with a normal eNB for the UE which is accessed to a cell of the RN, and then accesses an eNB which serves for the RN through a wireless interface in the similar mode of a normal UE; the eNB which serves for the RN is called as a Donor eNB (abbreviated as DeNB). 
     According to whether the RN has its own independent cells, or is taken as a part of a cell under the DeNB, a Type1 Relay and a Type2 Relay are respectively defined. The Type1 Relay refers that the RN can establish its own independent cells which have their own Physical Cell ID (abbreviated as PCI). The RN works as an eNB in its own cells, for example, transmitting reference signals, scheduling the UE, and the like. The Type2 Relay does not have its own independent cells and PCI, and is only used for assisting the DeNB to transmit data. Besides the Type1 Relay, a “Type1a” Relay and a “Type1 b” Relay are also defined in the standard, and are similar with the Type1 Relay in a cell establishment aspect; both the “Type1 a” Relay and the “Type1b Relay” have their own independent cells, and can independently receive and transmit control signals and perform the scheduling. 
     In view of the structure, the RN and the DeNB establish a unique S 1  connection on the control plane, and the DeNB is taken as a unique Mobility Management Entity (abbreviated as MME), all the S 1  signaling related to the UE will be transmitted to the DeNB through the S 1  connection, the DeNB transmits the S 1  signaling to a real MME destination on the S 1  connection established by the DeNB and the MME. Similarly, the RN also only establishes a unique X 2  connection with the DeNB, the X 2  signaling between the RN and other eNBs must be forwarded through the DeNB. 
     It should be noted that, an Operation and Maintenance (abbreviated as OAM) of the RN cannot communicate with the OAM of the DeNB (for example, the two belong to different operators), thus, the cell parameters allocated by the OAM of the RN, such as an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Cell Global Identifier (abbreviated as ECGI), may conflict with the ECGI of the cell managed by the DeNB, namely, the uniqueness of the ECGI is lost. So, the cell parameters of the cell managed by the RN are allocated by the DeNB, but not by the OAM of the RN. Thereby, the DeNB needs to know the number of the cells managed by the RN before allocating the cell parameters for the RN. 
     SUMMARY OF THE INVENTION 
     For that reason, one main purpose of the disclosure is to provide a method and device for configuring cell parameters of a RN, for solving the technical problem that the DeNB cannot reasonably configure the cell parameters since the DeNB does not know the cell amount of the RN. 
     In order to achieve the purpose, the technical solution of the disclosure is realized below. 
     a method for configuring cell parameters of an RN, comprising:sending, by a RN, a control signaling which carries a cell amount of one or more serving cells of the RN to a Donor eNB, DeNB; configuring, by the DeNB, cell parameters of the one or more serving cells for the RN according to the cell amount contained in the control signaling. 
     Preferably, the cell parameters of the one or more serving cells configured for the RN by the DeNB comprise an ECGI and a PCI. 
     Preferably, the control signaling comprises at least one of the following: a RRC signaling, an S 1  signaling and an X 2  signalling. 
     The RRC signaling comprises at least one of the following: a RRC Connection Setup Request message, a RRC Connection Setup Complete message, a RRC Connection Reestablishment Request message, a RRC Connection Reestablishment Complete message and a RRC Connection Reconfiguration Complete message; the S 1  signaling includes comprises at least one of the following: an S 1  Setup Request message and an eNB Configuration Update message; the X 2  signalling is an eNB Configuration Update message. 
     Preferably, sending, by the RN, the control signaling which carries the cell amount of the one or more serving cells of the RN to the DeNB comprises: before the RN establishes a RRC connection, or re-establishes a RRC connection, or performs a RRC connection reconfiguration, or establishes an S 1  connection with the DeNB, sending by the RN the control signaling which carries the cell amount of the one or more serving cells of the RN to the DeNB; and when the RN has a RRC connection, or an S 1  connection, or an X 2  connection with the DeNB, and the cell amount of the one or more serving cells of the RN is increased, sending, by the RN, the control signaling which carries the cell amount of the one or more serving cells of the RN to the DeNB. 
     According to the method of the disclosure, the disclosure also provides a device for configuring cell parameters of a RN, comprising a RN and a DeNB, wherein, the RN is further configured to send a control signaling which carries a cell amount of one or more serving cells of the RN to the DeNB;the DeNB is further configured to configure cell parameters of the one or more serving cells for the RN according to the cell amount contained in the control signaling. 
     Preferably, before the RN establishes a RRC connection, or re-establishes a RRC connection, or performs a RRC connection reconfiguration, or establishes an S 1  connection with the DeNB, the RN is configured to send the control signaling which carries the cell amount of the one or more serving cells of the RN to the DeNB; and when the RN has a RRC connection, or an S 1  connection, or an X 2  connection with the DeNB, and the cell amount of the one or more serving cells of the RN is increased, the RN is further configured to send the control signaling which carries the cell amount of the one or more serving cells of the RN to the DeNB. 
     In the disclosure, the RN sends the cell amount of the cell which are managed by the RN to the DeNB through the control signaling, so as to make the DeNB more reasonably configure the cell parameters of the RN. The disclosure solves the problem that the DeNB cannot reasonably distribute resources according to the cell number of the RN, and avoids resources conflicts, wherein the resources contain the ECGI, PCI and the like. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a diagram of a network structure using a Wireless Relay technique; 
         FIG. 2  shows a flow chart of a preferred embodiment 1 according to the disclosure; 
         FIG. 3  shows a flow chart of a preferred embodiment 2 according to the disclosure; 
         FIG. 4  shows a flow chart of a preferred embodiment 3 according to the disclosure; 
         FIG. 5  shows a flow chart of a preferred embodiment 4 according to the disclosure; 
         FIG. 6  shows a flow chart of a preferred embodiment 5 according to the disclosure; and 
         FIG. 7  shows a flow chart of a preferred embodiment 6 according to the disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     In order to make the purpose, the technical proposal and the advantage of the disclosure more clear, the disclosure is further described in details with reference to the embodiments and drawings below. 
     Before a DeNB distributes cell parameters of a serving cell of a RN for the RN, the RN needs to send a control signaling which carries a cell amount of one or more serving cell(s) of the RN to the DeNB; the DeNB configures the cell parameters of the RN according to the cell amount contained in the signaling. 
     The control signaling includes at least one of the following: a RRC signaling, an S 1  signaling and an X 2  signaling. 
     The RRC signaling includes at least one of the following: a RRC Connection Setup Request message (RRCConnectionRequest), a RRC Connection Setup Complete message (RRCConnectionSetupComplete), a RRC Connection Reestablishment Request message (RRCConnectionReestablishmentRequest), a RRC Connection Reestablishment Complete message (RRCConnectionReestablishmentComplete) and a RRC Connection Reconfiguration Complete message (RRCConnectionReconfigurationComplete). 
     The S 1  signaling includes at least one of the following: an S 1  Setup Request message (S 1  SETUP REQUEST) and an eNB Configuration Update message (eNB CONFIGURATION UPDATE). 
     The X 2  signaling includes the eNB Configuration Update message. 
     The step of configuring the cell parameters of the RN by the DeNB includes at least one of the following: configuring or reconfiguring the cell parameters, such as ECGI and PCI, of the servicing cell(s) of the RN for the RN by the DeNB. 
     The disclosure is further described in details with reference to the embodiments and drawings below. 
     Embodiment 1 
     If the RN has acquired the cell amount of the serving cell(s) of the RN (the cell amount can be preconfigured, or can be allocated by the OAM of the RN) before the RN establishes or re-establishes the RRC connection with the DeNB, the RN can send a RRC message which contains the cell amount of the serving cell(s) of the RN to the DeNB during the process of establishing or re-establishing the RRC connection, and thus the cell amount of one or more cell(s) managed by the RN is reported to the DeNB, so as to make the DeNB more reasonably configure the cell parameters of the RN. 
     The steps are as shown in  FIG. 2 : 
     Step  201 : during the process of establishing or re-establishing the RRC connection between the RN and the DeNB, the RN reports the cell amount of the cell(s) managed by the RN by sending a RRC message which contains the cell amount of the serving cell(s) of the RN to the DeNB. 
     The RRC message can be the RRCConnectionRequest message, the RRCConnectionSetupComplete message, the RRCConnectionReestablishmentRequest message, and the RRCConnectionReestablishmentComplete message. 
     Step  202 : after the DeNB successfully receives the RRC message which carries the cell amount, the DeNB reasonably configures the ECGI and the PCI for the serving cell(s) of the RN according to the cell amount. If current environment and the available resources owned by the DeNB allow the RN to establish cells as many as the RN can support, the DeNB allocates cell parameters, which correspond to the cell amount, for the RN; otherwise, the allocated cell parameters may be smaller than the cell amount. 
     The message replied to the RN from the DeNB can be a RRC Connection Setup (RRCConnectionSetup) message, a RRC Connection Reestablishment (RRCConnectionReestablishment) message, or a RRC Connection RN Reconfiguration (RRCConnectionRNReconfiguration) message. 
     Embodiment 2 
     If the RN has acquired the cell amount of the serving cell(s) of the RN (the cell amount can be preconfigured, or can be allocated by the OAM of the RN) before the RN performs the RRC connection reconfiguration with the DeNB, the RN also can send an RRC message which contains the cell amount of the serving cell of the RN to the DeNB during the process of the RRC connection reconfiguration, and thus the cell amount of the cell(s) managed by the RN is reported to the DeNB, so as to make the DeNB more reasonably configure the cell parameters of the RN. 
     The steps are as shown in  FIG. 3 : 
     Step  301 : during the process of the RRC connection reconfiguration between the RN and the DeNB, the RN reports the cell amount of the cell(s) managed by the RN by sending a RRC message which contains the cell amount of the serving cell(s) of the RN to the DeNB. 
     The RRC message can be the RRCConnectionReconfigurationComplete message. 
     Step  302 : after the DeNB successfully receives the RRC message which carries the cell amount, the DeNB reasonably configures the ECGI and the PCI for the serving cell(s) of the RN according to the cell amount. If current environment and available resources owned by the DeNB allows the RN to establish cells as many as the RN can support, the DeNB allocates the cell parameters, which correspond to the cell amount, for the RN; otherwise, the allocated cell parameters may be smaller than the cell amount. The message replied to the RN from the DeNB can be a RRC Connection RN Reconfiguration (RRCConnectionRNReconfiguration) message. 
     Embodiment 3 
     If an RRC connection has existed between the RN and the DeNB, and the cell amount of the serving cell(s) is increased, then the RN can send a RRC message which carries the cell amount of the serving cell(s) to the DeNB, and thus the cell amount of the cell(s) managed by the RN is reported to the DeNB, so as to make the DeNB more reasonably configure the cell parameters of the RN. 
     The steps are as shown in  FIG. 4 : 
     Step  401 : after the cell amount of the serving cell(s) of the RN is changed, the RN can send a RRC message which carries the cell amount of the serving cell(s) of the RN to the DeNB to report the cell amount of the cell(s) currently managed by the RN, wherein this amount can be the number of added cell(s), and also can be updated complete number. 
     Step  402 : after the DeNB successfully receives the RRC message which carries the cell amount, the DeNB reasonably configures the ECGI and the PCI for the serving cell(s) of the RN according to the cell amount. If current environment and available resources owned by the DeNB allows the RN to establish cells as many as the RN can support, the DeNB allocates the cell parameters, which correspond to the cell number, for the RN; otherwise, the allocated cell parameters may be smaller than the cell amount. The message replied to the RN from the DeNB can be a RRC Connection RN Reconfiguration (RRCConnectionRNReconfiguration) message. 
     Embodiment 4 
     If the RN has acquired the cell amount of the serving cell(s) of the RN (the cell amount can be preconfigured, or can be allocated by the OAM of the RN) before the RN establishes an S 1  connection with the DeNB, the RN can send an S 1  message which contains the cell amount of the serving cell(s) of the RN to the DeNB during the process of establishing the S 1  connection, and thus the cell amount of the cell(s) managed by the RN is reported to the DeNB, so as to make the DeNB more reasonably configure the cell parameters of the RN. 
     The steps are as shown in  FIG. 5 : 
     Step  501 : during the process of establishing the S 1  connection between the RN and the DeNB, the RN reports the cell amount of the cell(s) managed by the RN by sending an S 1  message which contains the cell amount of the serving cell(s) of the RN to the DeNB. 
     The S 1  message can be an S 1  Setup Request (S 1 SetupRequest) message. 
     Step  502 : after the DeNB successfully receives the S 1  message which carries the cell amount, the DeNB reasonably configures the ECGI and the PCI for the serving cell(s) of the RN according to the cell amount. If current environment and available resources owned by the DeNB allows the RN to establish cells as many as the RN can support, the DeNB allocates the cell parameters, which correspond to the cell amount, for the RN; otherwise, the allocated cell parameters may be smaller than the cell amount. The message replied to the RN from the DeNB can be an S 1  Setup Response (S 1 SetupResponse) message or a RRC Connection RN Reconfiguration (RRCConnectionRNReconfiguration) message. 
     Embodiment 5 
     If an S 1  connection has existed between the RN and the DeNB, and the cell amount of the serving cell(s) of the RN is increased, then the RN can send an S 1  message which carries the cell amount of the serving cell(s) to the DeNB, and thus the cell amount of the cell(s) managed by the RN is reported to the DeNB, so as to make the DeNB more reasonably configure the cell parameters of the RN. 
     The steps are as shown in  FIG. 6 : 
     Step  601 : after the cell amount of the service cell(s) of the RN is changed, the RN can send an S 1  message which carries the cell amount of the serving cell(s) of the RN to the DeNB to report the cell amount of the cell(s) currently managed by the RN, wherein this amount can be the number of added cell(s), and also can be a updated complete number. 
     The S 1  message can be an eNB Configuration Update (eNB CONFIGURATION UPDATE) message. 
     Step  602 : after the DeNB successfully receives the S 1  message which carries the cell amount, the DeNB reasonably configures the ECGI and the PCI for the serving cell(s) of the RN according to the cell amount. If current environment and available resources owned by the DeNB allows the RN to establish cells as many as the RN can support, the DeNB allocates the cell parameters, which correspond to the cell amount, for the RN; otherwise, the allocated cell parameters may be smaller than the cell amount. 
     The message replied to the RN from the DeNB can be an eNB Configuration Update Acknowledge (eNB CONFIGURATION UPDATE ACKNOWLEDGE) message or a RRC Connection RN Reconfiguration (RRCConnectionRNReconfiguration) message. 
     Embodiment 6 
     If an X 2  connection has existed between the RN and the DeNB, and the cell amount of the serving cell(s) is increased, then the RN can send an X 2  message which carries the cell amount of the serving cell(s) to the DeNB, and thus the cell amount of the cells managed by the RN is reported to the DeNB, so as to make the DeNB more reasonably configure the cell parameters of the RN. 
     The steps are as shown in  FIG. 7 : 
     Step  701 : after the cell amount of the service cell(s) of the RN is changed, the RN can send an X 2  message which carries the cell amount of the serving cell(s) of the RN to the DeNB to report the cell amount of the cell(s) currently managed by the RN, wherein this amount can be the number of added cell(s), and also can be updated complete number. 
     The X 2  message can be an eNB Configuration Update (eNB CONFIGURATION UPDATE) message. 
     Step  702 : after the DeNB successfully receives the X 2  message which carries the cell amount, the DeNB reasonably configures the ECGI and the PCI for the serving cell(s) of the RN according to the cell number. If current environment and available resources owned by the DeNB allows the RN to establish cells as many as the RN can support, the DeNB allocates the cell parameters, which correspond to the cell amount, for the RN; otherwise, the allocated cell parameters may be smaller than the cell amount. 
     The message replied to the RN from the DeNB can be an eNB Configuration Update Acknowledge (eNB CONFIGURATION UPDATE ACKNOWLEDGE) message or a RRC Connection RN Reconfiguration (RRCConnectionRNReconfiguration) message. 
     Certainly, the disclosure may have various other embodiments; in the case of obeying the spirits and nature of the disclosure, those skilled in the art can make various corresponding changes and deformations according to the disclosure; and all the corresponding changes and deformations shall fall within the protection range of the attached claims of the disclosure. 
     The above is only the preferred embodiment of the disclosure and not intended to limit the disclosure. 
     INDUSTRIAL APPLICABILITY 
     In the disclosure, the RN sends the cell amount of the cell which are managed by the RN to the DeNB through the control signaling, so as to make the DeNB more reasonably configure the cell parameters of the RN cells. The disclosure solves the problem that the DeNB cannot reasonably allocate resources according to the cell number of the RN, and avoids resources such as ECGI, PCI conflicts.