JP5296246B2 - Mobile communication method, mobile communication system, and radio base station - Google Patents

Description

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

  In the LTE (Long Term Evolution) -Advanced scheme, a relay node RN (Relay Node) that can be connected to the radio base station DeNB (Doner eNB) via the Un interface can be used.

  The relay node RN is configured to perform radio communication with the radio base station DeNB via the Un interface and to perform radio communication with the mobile station UE via the Uu interface.

3GPP TS 36.300 (V10.0. 0), "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Month (10-UTR) 3GPP TS33.401 (V9.4.0), “3GPP System Architecture Evolution (SAE); Security architecture”, June 2010

  In the LTE-Advanced scheme, the S1AP / X2AP layer signaling is configured to be transmitted as U-plane data on a DRB (Data Radio Bearer) in a radio section in which the Un interface is used (hereinafter referred to as Un radio section). Has been.

  In the Un radio section, when NDP (Network Domain Security) / IP is not used for DRB, it is necessary to perform integrity protection (integrity protection) in order to enhance security for signaling of the S1AP / X2AP layer. There is.

  However, the existing LTE-Advanced scheme has a problem that the relay node RN and the radio base station DeNB cannot identify a DRB that needs to be integrity protected.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a mobile communication method and a radio base station that can identify a DRB that needs to be integrity protected.

  A first feature of the present invention is a mobile communication method for transmitting and receiving signaling of a predetermined protocol layer on a data radio bearer established between a radio base station and a relay node, the relay node attaching process And the step of setting the data radio bearer and the step of notifying the relay node and the radio base station of the data radio bearer in the process of attaching the relay node.

  A second feature of the present invention is a mobile communication method for transmitting / receiving signaling of a predetermined protocol layer on a data radio bearer established between a radio base station and a relay node, wherein the relay node attach process After completing the process, the data radio bearer is set, and after the relay node attach process is completed, the data radio bearer is notified to the relay node and the radio base station. Is the gist.

  A third feature of the present invention is a mobile communication method for transmitting / receiving signaling of a predetermined protocol layer on a data radio bearer established between a radio base station and a relay node, the relay node attaching process In the step of setting the data radio bearer, in the process of attaching the relay node, the step of notifying the data radio bearer to the radio base station, and after the process of attaching the relay node is completed, And a step of notifying the relay node of the data radio bearer.

  A fourth feature of the present invention is a radio base station configured to transmit and receive signaling of a predetermined protocol layer on a data radio bearer established with a relay node, the radio base station comprising: In the attach process, the data radio bearer is configured to be set, and in the attach process of the relay node, the relay node is configured to notify the data radio bearer. To do.

  A fifth feature of the present invention is a radio base station configured to transmit and receive signaling of a predetermined protocol layer on a data radio bearer established with a relay node, the radio base station comprising: It is configured to set the data radio bearer after the attach process is completed, and is configured to notify the data radio bearer to the relay node after the attach process of the relay node is completed. It is a summary.

  A sixth feature of the present invention is a radio base station configured to transmit and receive signaling of a predetermined protocol layer on a data radio bearer established with a relay node, and In the attach process, the data radio bearer is configured to be configured, and after the relay node attach process is completed, the data radio bearer is configured to be notified to the relay node. Is the gist.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a radio base station that can identify a DRB that needs to be integrity protected.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a protocol stack diagram of the mobile communication system 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 figure which shows an example of the format of "Initial Context Setup Request" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of "RRC Connection Reconfiguration" used with the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the format of the information element "RadioResourceConfigDedicated" which can be set to "radioResourceConfigDedicated" in "RRC Connection Reconfiguration" used with the mobile communication system which concerns on the 1st Embodiment of this invention. Information element that can be set in “radioResourceConfigDedicated” in “RRC Connection Reconfiguration” used in the mobile communication system according to the first embodiment of the present invention can be set in “pdcp-ConfigPD information” that can be set in “RadioResourceConfigDedicatedPD” It is a figure which shows an example of a format of -Config. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the modification 1 of this invention. It is a figure which shows an example of the format of "Create Bearer Context" used with the mobile communication system which concerns on the example 1 of a change of this invention. It is a figure which shows an example of the format of the information element "Bearer Context" in "Create Bearer Context" used with the mobile communication system which concerns on the modification 1 of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the modification 2 of this invention.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 7, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  The mobile communication system according to the present embodiment is an LTE-Advanced mobile communication system, and as shown in FIG. 1, a subscriber information management server HSS (Home Subscriber Server) and a mobility management node MME (Mobility Management Entity). ), A radio base station DeNB, a relay node RN, and an O & M (Operation & Maintenance) server.

  The relay node RN is configured to perform radio communication with the radio base station DeNB via the Un interface and to perform radio communication with the mobile station UE via the Uu interface.

  FIG. 2 shows a protocol stack used in the mobile communication system according to this embodiment.

  As shown in FIG. 2, the mobile station UE is provided as a physical (PHY) layer function and an upper layer function of the physical (PHY) layer function in a radio section (hereinafter referred to as Uu radio section) in which the Uu interface is used. MAC (Media Access Control) layer function, RLC (Radio Link Control) layer function provided as an upper layer function of the MAC layer function, and PDCP (Packet Data Convergence) provided as an upper layer function of the RLC layer function (Protocol) layer function, RRC (Radio Resource Control) layer function provided as an upper layer function of PDCP layer function, and upper layer function of RRC layer function Its dependent NAS has and a (Non Access Stratum) layer function.

  Further, the relay node RN is provided as a physical (PHY) layer function, a MAC layer function provided as an upper layer function of the physical (PHY) layer function, and an upper layer function of the MAC layer function in the Uu radio section. RLC layer function, a PDCP layer function provided as an upper layer function of the RLC layer function, and an RRC layer function provided as an upper layer function of the PDCP layer function.

  Further, the relay node RN and the radio base station DeNB include, in the Un radio section, a physical (PHY) layer function, a MAC layer function provided as an upper layer function of the physical (PHY) layer function, and an upper layer of the MAC layer function. An RLC layer function provided as a layer function, a PDCP layer function provided as an upper layer function of the RLC layer function, an IP (Internet Protocol) layer function provided as an upper layer function of the PDCP layer function, SCTP (Stream Control Protocol) layer function provided as an upper layer function of the IP layer function, and S1AP / X2AP layer function provided as an upper layer function of the SCTP IP layer function It is equipped with.

  That is, S1AP / X2AP layer signaling is configured to be transmitted / received on the DRB established between the radio base station DeNB and the relay node RN (that is, the Un radio section).

  The radio base station DeNB has a network layer 1 (NW L1) function and a network layer 2 (NW L2) function provided as an upper layer function of the network layer 1 function at the interface with the mobility management node MME. An IP layer function provided as an upper layer function of the network layer 2 function, an SCTP layer function provided as an upper layer function of the IP layer function, and an S1AP provided as an upper layer function of the SCTP layer function / X2AP layer function.

  Similarly, the mobility management node MME has a network layer 1 (NW L1) function and a network layer 2 (NW L2) provided as an upper layer function of the network layer 1 function at the interface with the radio base station DeNB. ) Function, an IP layer function provided as an upper layer function of the network layer 2 function, an SCTP layer function provided as an upper layer function of the IP layer function, and an upper layer function of the SCTP layer function S1AP / X2AP layer function and NAS layer function provided as an upper layer function of the S1AP / X2AP layer function.

  Note that NDS / IP may be used for the IP layer functions of the radio base station DeNB and the mobility management node MME.

  Here, the mobile communication system according to the present embodiment performs integrity protection for DRBs that transmit / receive S1AP / X2AP layer signaling among DRBs established between the radio base station DeNB and the relay node RN. Configured to do.

  On the other hand, the mobile communication system according to the present embodiment provides integrity for DRBs other than the DRB that transmits and receives S1AP / X2AP layer signaling among DRBs established between the radio base station DeNB and the relay node RN. It is configured not to perform protection.

  In the mobile communication system according to the present embodiment, the DRB that transmits and receives S1AP / X2AP layer signaling is configured to be set in a relay node attach process.

  Further, in the mobile communication system according to the present embodiment, the DRB that transmits and receives S1AP / X2AP layer signaling is configured to be notified to the relay node RN and the radio base station DeNB in the attach process of the relay node RN. ing.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIGS. 3 to 7.

  As illustrated in FIG. 3, in step S1001, the relay node RN transmits “RRC Connection Request” to the radio base station DeNB.

  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” to the mobility management node MME.

  In step S1005, "Authentication / Security" processing is performed.

  In step S1006, the mobility management node MME transmits “Initial Context Setup Request” including “Attach Accept” to the radio base station DeNB.

  Here, in addition to the default bearer, the mobility management node MME requests to set a DRB that transmits and receives signaling of the S1AP / X2AP layer. In this case, the mobility management node MME notifies the radio base station DeNB of which bearer among the set bearers is the DRB that transmits and receives signaling of the S1AP / X2AP layer by using “Initial Context Setup Request”.

  For example, as illustrated in FIG. 4, the mobility management node MME performs the “For-Bet Setup Item IEs” in the “E-RAB to Be Setup Item IE” in the information element “E-RAB to Be Setup List” in the “Initial Context Setup Request”. By “S1 / X2-AP”, it is possible to notify whether or not the corresponding bearer is a DRB that transmits and receives signaling of the S1AP / X2AP layer.

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

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

  In step S1009, the radio base station DeNB transmits “UE (RN) Capability Info Indication” to the mobility management node MME.

  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 determines whether a bearer to be configured is a DRB that transmits / receives signaling of the S1AP / X2AP layer (that is, a DRB that needs to perform integrity protection) as “RRC Connection Reconfiguration”. To the relay node RN.

  For example, as illustrated in FIG. 5 to FIG. 7, the radio base station DeNB performs the “integrityProtection-RequiredRequest” in the information element “PDCP-Configuration” that can be set in the information element “RadioResourceConfigDedicated” that can be set in the “RRC Connection Reconfiguration”. The above notification is performed by “r9”.

  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, for example, the relay node RN performs the key K as well as the key K _eNB , the key K _{RRC_enc} , the key K _{RRC_int} , and the key K _{UP_enc} for the DRB that needs to be integrity protected in accordance with the provisions of 3GPP TS33.401. _{S1X2_int} is generated, and similarly, the radio base station DeNB is the same as the key K _eNB , the key K _{RRC_enc} , the key K _{RRC_int} , and the key K _{UP_enc} for the DRB that needs to be integrity protected in accordance with the provisions of 3GPP TS33.401 _Next , a key K _{S1X2_int} is generated.

  In step S1014, the radio base station DeNB transmits “Initial Context Setup Response” to the mobility management node MME.

  In step S1015, the relay node RN transmits “Attach Complete” to the mobility management node MME.

  In step S1016, the relay node RN downloads relay node setting information (Node Configuration) from the O & M server, and in step S1017, sets the S1 / X2 interface with the radio base station DeNB.

  According to the mobile communication system according to the present embodiment, in the attachment process of the relay node RN, the mobility management node MME transmits / receives S1AP / X2AP layer signaling to the radio base station DeNB by “Initial Context Setup Request”. The radio base station DeNB notifies the relay node RN of the DRB that transmits / receives signaling of the S1AP / X2AP layer (that is, the DRB that needs to perform integrity protection) to the relay node RN by “RRC Connection Reconfiguration”. can do.

(Modification 1)
Hereinafter, the mobile communication system according to the first modification will be described with reference to FIGS. 8 to 10 while focusing on differences from the mobile communication system according to the first embodiment.

  In the mobile communication system according to the first modification, the DRB that transmits and receives S1AP / X2AP layer signaling is configured to be set after the relay node attach process is completed.

  Also, in the mobile communication system according to the first modification, the DRB that transmits and receives S1AP / X2AP layer signaling is notified to the relay node RN and the radio base station DeNB after the relay node RN attach process is completed. It is configured as follows.

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

  As shown in FIG. 8, the operations in steps S2001 to S2015 are the same as the operations in steps S1001 to S1015 shown in FIG. However, in the relay node RN attach process shown in steps S2001 to S2015, the default bearer is set, but the DRB for transmitting and receiving signaling of the S1AP / X2AP layer is not set.

  Thereafter, after the attach process of the relay node RN is completed, in step S2016, a DRB setting process for transmitting / receiving S1AP / X2AP layer signaling is performed.

  Specifically, as shown in FIG. 8, in step 1, the radio base station DeNB transmits “GTP-C Create / Update Bearer Request” to the mobility management node MME, and in step 2, the mobility management The node MME transmits “S1-AP Bearer Create / Modify Request” to the radio base station DeNB.

  Here, the radio base station DeNB and the mobility management node MME determine which bearer among the set bearers is the DRB that transmits and receives S1AP / X2AP layer signaling, and “GTP-C Create / Update Bearer Request” and Notification is made by “S1-AP Bearer Create / Modify Request”.

  For example, as illustrated in FIG. 9 and FIG. 10, the radio base station DeNB corresponds to “For S1 / X2-AP use” in the information element “Bear Context” in “GTP-C Create / Update Bearer Request”. It is possible to notify whether the bearer to perform is a DRB that transmits and receives signaling of the S1AP / X2AP layer.

  In Step 3, the radio base station DeNB transmits “RRC Connection Reconfiguration” to the relay node RN, and the relay node RN transmits “RRC Connection Reconfiguration Complete” to the radio base station DeNB.

  Here, as described above, the radio base station DeNB determines which bearer among the configured bearers is a DRB that transmits and receives S1AP / X2AP layer signaling (that is, a DRB that needs to perform integrity protection). , “RRC Connection Reconfiguration” notifies the relay node RN.

  For example, as illustrated in FIG. 9 and FIG. 10, the radio base station DeNB performs “integrityProtection-Request” in the information element “PDCP-Configuration” that can be set in the information element “RadioResourceConfigDedicated” that can be set in “RRC Connection Reconfiguration”. The above notification is performed by “r9”.

  Or radio base station DeNB does not need to perform this notification explicitly. In such a case, the relay node RN may determine that the bearer set in step S2016 is a DRB that transmits and receives signaling of the S1AP / X2AP layer (that is, a DRB that needs to perform integrity protection).

  In Step 4, the radio base station DeNB transmits “S1-AP Bearer Setup / Modify Response” to the mobility management node MME.

  In Step 5a, the relay node RN transmits “Direct Transfer” to the radio base station DeNB, and in Step 5b, the radio base station DeNB transmits “Direct Transfer” to the mobility management node MME. .

  In step 6, the mobility management node MME transmits “GTP-C Create / Update Bearer Response” to the radio base station DeNB.

  Hereinafter, the operations in steps S2017 and S2018 are the same as the operations in steps S1016 and S1017 shown in FIG.

  According to the mobile communication system according to the first modification, after the attach process of the relay node RN is completed, the mobility management node MME performs the “S1-AP Bearer Create / Modify Request” with respect to the radio base station DeNB. The radio base station DeNB notifies the DRB that transmits and receives the S1AP / X2AP layer signaling, and the radio base station DeNB transmits, to the relay node RN, the DRB that transmits and receives the S1AP / X2AP layer signaling by “RRC Connection Reconfiguration” (ie, integrity protection). DRB) that needs to be done can be notified.

(Modification 2)
Hereinafter, with reference to FIG. 11, the mobile communication system according to the second modification will be described by focusing on the differences from the mobile communication system according to the first embodiment described above.

  In the mobile communication system according to the second modification, the DRB that transmits and receives S1AP / X2AP layer signaling is configured to be set in the relay node attach process.

  Also, in the mobile communication system according to the first modification, the DRB that transmits and receives S1AP / X2AP layer signaling is notified to the radio base station DeNB in the relay node RN attach process, and the relay node RN attach process is performed. After completion, the relay node RN is configured to be notified.

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

  As shown in FIG. 11, the operations in steps S3001 to S3015 are the same as the operations in steps S1001 to S1015 shown in FIG. However, in the relay node RN attach process shown in steps S3001 to S3015, in addition to the default bearer, a DRB that transmits and receives S1AP / X2AP layer signaling is set, but the DRB that transmits and receives such S1AP / X2AP layer signaling is The relay node RN is not notified.

  In step S3016, the radio base station DeNB transmits to the relay node RN which DRB (that is, the integrity) among the bearers set by the “RRC RN Configuration” that transmits and receives signaling of the S1AP / X2AP layer. It is notified whether it is DRB that needs to be protected.

  For example, the radio base station DeNB transmits “RRC RN Configuration” including an identifier (DRB-ID) for identifying a DRB that transmits and receives S1AP / X2AP layer signaling to the relay node RN.

  In step S3017, the relay node RN transmits “RRC RN Configuration Complete” to the radio base station DeNB.

  In step S3017, an S1 / X2 interface is set with the radio base station DeNB.

  According to the mobile communication system according to the second modification, in the attach process of the relay node RN, the mobility management node MME transmits the S1AP / X2AP layer signaling to the radio base station DeNB by “Initial Context Setup Request” or the like. After the relay process of attaching the relay node RN is completed, the radio base station DeNB transmits and receives the S1AP / X2AP layer signaling to the relay node RN by “RRC RN Configuration” ( That is, it is possible to notify DRB) that needs to perform integrity protection.

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

  The first feature of the present embodiment is that the mobile station transmits and receives S1AP / X2AP layer (predetermined protocol layer) signaling on a DRB (data radio bearer) established between the radio base station DeNB and the relay node RN. It is a communication method, the step of setting the above-mentioned DRB in the attach process of the relay node RN, and the step of notifying the above-mentioned DRB to the relay node RN and the radio base station DeNB in the attach process of the relay node RN It is summarized as having.

  A second feature of the present embodiment is a mobile communication method for transmitting and receiving S1AP / X2AP layer signaling on a DRB established between a radio base station DeNB and a relay node RN. After the attach process is completed, the above-described DRB is set, and after the attach process of the relay node RN is completed, the DRB is notified to the relay node RN and the radio base station DeNB. Is the gist.

  A third feature of the present embodiment is a mobile communication method for transmitting and receiving S1AP / X2AP layer signaling on a DRB established between a radio base station DeNB and a relay node RN. In the attach process, the process of setting the DRB described above, the process of notifying the radio base station of the DRB described above in the attach process of the relay node RN, and the relay process after the attach process of the relay node RN is completed And a step of notifying the node RN of the above-described DRB.

  A fourth feature of the present embodiment is a radio base station DeNB configured to transmit and receive S1AP / X2AP layer signaling on a DRB established with a relay node RN, the relay node RN comprising: In the attach process of RN, it is configured to set the above-mentioned DRB, and in the attach process of relay node RN, it is configured to notify the above-mentioned DRB to relay node RN. To do.

  A fifth feature of the present embodiment is a radio base station DeNB configured to transmit and receive S1AP / X2AP layer signaling on a DRB established with a relay node RN, the relay node comprising: It is configured to set the above-mentioned DRB after completion of the RN attach process, and is configured to notify the above-mentioned DRB to the relay node RN after the attach process of the relay node RN is completed. It is a summary.

  A sixth feature of the present embodiment is a radio base station DeNB configured to transmit and receive S1AP / X2AP layer signaling on a DRB established with a relay node RN, the relay node RN comprising: The RN attach process is configured to set the DRB described above, and is configured to notify the relay node RN of the DRB after the attach process of the relay node RN is completed. Is the gist.

  Note that the operations of the subscriber information management server HSS, the mobility management node MME, the radio base station DeNB, the relay node RN, and the mobile station UE described above may be implemented by hardware or by software modules executed by the processor. It may be implemented or a combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the subscriber information management server HSS, the mobility management node MME, the radio base station DeNB, the relay node RN, and the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the subscriber information management server HSS, the mobility management node MME, the radio base station DeNB, the relay node RN, and the mobile station UE.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station MME ... mobile management node RN ... relay node DeNB ... radio base station HSS ... subscriber information management server

Claims (3)

  In the relay node attach process, a step of setting a radio bearer between the radio base station and the relay node;
  For the radio bearers of a plurality of radio bearers to be set, the radio base station indicates information specifying a data radio bearer and whether or not the data radio bearer needs to perform integrity protection. Notifying a flag using a configurable information element in "RRC Connection Reconfiguration";
  The relay node refers to the flag notified by the “RRC Connection Reconfiguration” and generates an integrity protection key for a data radio bearer that needs to be integrity protected;
  In the security mode command process performed in the process of attaching the relay node, the radio base station includes a step of generating a key for performing integrity protection for the data radio bearer that needs to perform integrity protection. A characteristic mobile communication method.   A mobile communication system comprising a relay notebook and a radio base station,
  In the relay node attach process, a radio bearer is configured to be set between the radio base station and the relay node,
  The radio base station indicates to the relay node, for each radio bearer of a plurality of radio bearers to be set, information specifying a data radio bearer and whether the data radio bearer needs to perform integrity protection. The flag is configured to be notified using a configurable information element in “RRC Connection Reconfiguration”.
  The relay node is configured to generate an integrity protection key for a data radio bearer that needs to be integrity protected with reference to the flag notified by the “RRC Connection Reconfiguration”.
  In the security mode command processing performed in the relay node attach processing, the radio base station is configured to generate a key for performing integrity protection for the data radio bearer that needs to perform integrity protection. A mobile communication system.   In a relay node attach process, a radio base station configured to set a radio bearer with the relay node,
  For each radio bearer of a plurality of radio bearers to be set for the relay node, information specifying a data radio bearer and a flag indicating whether or not the data radio bearer needs to perform integrity protection are set as “RRC Connection Reconfiguration”. ”Is configured to notify using configurable information elements within
  A radio configured to generate a key for performing integrity protection for the data radio bearer that needs to perform integrity protection in security mode command processing performed in the attach process of the relay node. base station.

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