WO2011124135A1 - Procédé et dispositif pour l'adressage d'un nœud de cœur de réseau au cours d'une procédure de transfert intercellulaire - Google Patents

Procédé et dispositif pour l'adressage d'un nœud de cœur de réseau au cours d'une procédure de transfert intercellulaire Download PDF

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Publication number
WO2011124135A1
WO2011124135A1 PCT/CN2011/072495 CN2011072495W WO2011124135A1 WO 2011124135 A1 WO2011124135 A1 WO 2011124135A1 CN 2011072495 W CN2011072495 W CN 2011072495W WO 2011124135 A1 WO2011124135 A1 WO 2011124135A1
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Prior art keywords
base station
link identifier
user terminal
core network
request message
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PCT/CN2011/072495
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English (en)
Chinese (zh)
Inventor
贾贝贝
汪颖
杨义
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电信科学技术研究院
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Publication of WO2011124135A1 publication Critical patent/WO2011124135A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/34—Modification of an existing route
    • H04W40/36—Modification of an existing route due to handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and apparatus for addressing a core network node in a handover process. Background technique
  • a relay node (hereinafter referred to as RN) is introduced to increase network coverage.
  • the RN is connected to the base station (Don Evolved Node B, DeNB) in a wireless manner.
  • the wireless interface between them is called the Un interface.
  • the UE User Equipment, User Equipment or User Terminal
  • B 3G Next Three Generation
  • LTE-A Long Term Evolution Advanced
  • FIG. 1 is a network architecture after an LTE-A system introduces an RN.
  • the RN accesses the core network through a donor cell under the eNB.
  • the interface between the UE and the RN is called Uu, and the interface between the RN and the DeNB is called Un.
  • Multiple RNs can be connected under one DeNB, and one RN can only be connected to one DeNB.
  • the UE switches between the RN and the DeNB and between the RN and the RN.
  • LTE-A relay LTE-A relay
  • candidate protocol stack architectures are currently proposed.
  • the DeNB has the S1AP and X2AP proxy functions, and only one S1 interface and one X2 interface are established between the RN and the DeNB.
  • the method for the target base station to address the core network is: the source eNB sends a handover request message to the target eNB, where the message carries a GUMMEI (Globally Unique MME Identifier) information, and the GUMMEI information is the global MME.
  • the unique identifier is composed of a PLMN ID, an MME Group ID, and an MME code, and each GUMMEI corresponds to only one MME (Mobility Management Entity).
  • the target eNB addresses the MME according to the GUMMEI information, and initiates a path switching process to the MME registered by the UE.
  • the target node RN initiates a path switching process to the DeNB to which the UE belongs, and there is no GUMMEI information in the path switching request message, and the DeNB will not be correctly addressed. To the MME.
  • the path switching request message has the source MME UE S1AP ID information
  • the MME UE S1AP ID uniquely identifies one UE only within one MME, and it is possible that different MMEs allocate different MMEs to different UEs, and the S1AP IDs are the same, when different UEs Same
  • the DeNB cannot determine which MME the source MME UE Sl-AP ID corresponds to, and thus cannot correctly address the MME. Summary of the invention
  • the embodiments of the present invention provide a method for addressing a core network node in a handover process and a device thereof, which are used to solve the problem that a base station cannot correctly address a core network node when performing handover in a network architecture introduced into a relay node.
  • the method for addressing a core network node in a handover process is applied to a process in which a user terminal switches from a source node to a target node, and the target node is a relay node, and the method includes:
  • the base station to which the target relay node belongs sends or forwards a handover request message to the target relay node, and establishes a correspondence between the S1 link identifier of the user terminal and the core network node identifier, where the core network node corresponding to the core network node identifier is a core network node to which the user terminal is connected;
  • the base station After receiving the path switching request message sent by the target relay node, the base station determines the source S1 chain according to the source S1 link identifier carried in the path switching request message and the corresponding relationship established by the base station.
  • the core network node identifier corresponding to the road identifier and forwards the path switching request message to the core network node corresponding to the core network node identifier.
  • a handover request processing module configured to send or forward a handover request message to the target relay node, and establish a correspondence between the S1 link identifier of the user terminal and the core network node identifier, where the core network node corresponding to the core network node identifier is a core network node connected to the user terminal;
  • a path switching request processing module configured to: after receiving the path switching request message sent by the target relay node, the source S1 link identifier carried in the path switching request message and the corresponding correspondence established by the switching request processing module And determining a core network node identifier corresponding to the source S1 link identifier, and forwarding a path switching request message to the core network node corresponding to the core network node identifier.
  • the mapping between the S1 link identifier of the user terminal and the core network node identifier is established by the base station to which the target relay node belongs, so that the base station to which the target relay node belongs is received by the target relay node.
  • the source network node identifier corresponding to the source S1 link identifier is determined according to the source S1 link identifier carried in the path switching request message and the corresponding relationship established by the base station, and The path switching request message is forwarded to the core network node corresponding to the core network node identifier, so that the base station correctly addresses the core network node.
  • FIG. 1 is a schematic diagram of an E-UTRAN network architecture including a RN in the prior art
  • FIG. 2 is a schematic diagram of six handover scenarios of a relay network in the prior art
  • FIG. 3 is a schematic diagram of a UE attaching process in the prior art
  • FIG. 4 is a schematic diagram of a X2 handover process in the prior art
  • FIG. 5 is a schematic diagram of a handover procedure of DeNB1 to RN1 according to Embodiment 1 of the present invention
  • FIG. 6 is a schematic diagram of a handover procedure of RN1 to RN2 according to Embodiment 2 of the present invention
  • FIG. 7 is a schematic diagram of a handover procedure of DeNB1 to RN3 according to Embodiment 3 of the present invention
  • FIG. 8 is a schematic diagram of a handover procedure of RN2 to RN3 according to Embodiment 4 of the present invention
  • FIG. 9 is a schematic structural diagram of a base station apparatus according to an embodiment of the present invention. detailed description
  • the embodiments of the present invention provide a technical solution for the DeNB to address a core network node.
  • the technical solution provided by the embodiment of the present invention can use the DeNB in the candidate architectures 2 and 4 to parse and read the information in the message, allocate and replace the S1 link identifier (S1AP ID), and establish and save the mapping relationship with the core network node identifier. Thereby the DeNB can be correctly addressed to the core network node.
  • FIG. 3 it is a schematic flowchart of a UE attaching an RN in the prior art.
  • the RN sends an initial UE message to the MME, including an S1 link identifier allocated by the RN for the UE: eNB UE SIAP ID (referred to as eNB UE SIAP ID1); after receiving the message, the DeNB will The eNB UE S1AP ID1 is modified to the eNB UE SIAP ID (recorded as the eNB UE SIAP ID2) allocated by the UE, and then the message is forwarded to the MME.
  • eNB UE SIAP ID1 an S1 link identifier allocated by the RN for the UE
  • the DeNB After receiving the message, the DeNB will The eNB UE S1AP ID1 is modified to the eNB UE SIAP ID (recorded as the eNB UE SIAP ID2) allocated by the UE, and then the message is forwarded to the MME.
  • the MME After receiving the initial UE message, the MME allocates an S1 link identifier to the UE:
  • the MME UE SIAP ID (recorded as MME UE SIAP ID3) is stored corresponding to the received eNB UE SIAP ID2.
  • the MME UE SIAP ID3 uniquely identifies one UE within one MME. Thereafter, the MME distinguishes the UE according to the MME UE SIAP ID3 in the received S1-AP message.
  • the MME sends an initial context setup request to the DeNB to which the RN belongs.
  • the message includes the MME UE SIAP ID3 allocated by the MME for the UE.
  • the DeNB replaces the received MME UE SIAP ID3 with its own assigned MME UE SIAP ID (recorded as MME UE SIAP ID4), and stores it correspondingly with the eNB UE SIAP ID2 allocated by the UE for the UE and the eNB UE SIAP ID1 allocated by the RN for the UE. stand up.
  • the DeNB then forwards the initial context setup request message to the RN for establishing the UE context in the RN.
  • the RN allocates an eNB UE SIAP ID1 to the UE and stores the received MME UE SIAP ID4 together.
  • the RN then sends an initial context setup response message to the MME for confirmation.
  • the correspondence stored by each node may be as shown in Table 1.
  • the source base station performs handover decision according to the measurement result of the UE, and selects a suitable target cell, and The target base station sends a handover request; if the target base station allows the UE to access, it returns a handover request acknowledgement message to the source base station; the source base station sends a handover command (ie, an RRC connection reconfiguration message) to the UE; the UE accesses the target cell after receiving the handover command, Sending an RRC (Radio Network Resource Control) connection reconfiguration complete message to the target cell; the target base station sends a path switching request (or a path switching request, the same below) to the core network MME, and the MME then sends the S-GW (Serving Gateway, Serving Gateway) Sending a user plane path update request; after the S-GW converts the downlink transmission path, it confirms to the MME, and the MME confirms to the target
  • a handover command ie, an RRC connection reconfiguration message
  • the embodiment of the present invention provides a method for the DeNB to address the core network node, for the scenario where the Intra-DeNB switches to the RN and the Inter-DeNB switches to the RN.
  • the scenario in which the Intra-DeNB switches to the RN may include: scenario 1: handover of the base station to the relay node under the base station, such as DeNB1 -> RN1 scenario 2: each relay under the same base station
  • scenario 1 handover of the base station to the relay node under the base station
  • scenario 2 each relay under the same base station
  • the MME UE S1AP ID is established (the ID is the MME or And the corresponding relationship between the MAMMEI and the DeNB1, which is unique in the range of the DeNB1) when the UE establishes a connection with the UE;
  • the DeNB 1 according to the source MME UE S1AP ID carried in the path switching request message and before the target RN initiates the path switching process to the DeNB1
  • Corresponding relationship of the storage find the corresponding GUMMEI information, so as to correctly address the MME to complete the path switching
  • the foregoing handover process may need to be improved on the existing base station (DeNB1 in the process), for example, the DeNB needs to determine the uniqueness of the MME UE S1AP ID, allocate and replace the MME UE S1AP ID, and establish and save the MME/eNB UE S1AP ID and Correspondence relationship of GUMMEI, according to the correspondence relationship, when the UE establishes a connection GUMMEI.
  • the scenario in which the Inter-DeNB switches to the RN may include: scenario 3: handover of the relay node from the base station to another base station, such as DeNB1 -> RN3 scenario 4: relay under different base stations
  • scenario 3 handover of the relay node from the base station to another base station
  • scenario 4 relay under different base stations
  • the switching between the nodes, such as RN2 -> RN3, for the scenario 3, 4, in the foregoing handover process when the DeNB2 to which the target RN belongs receives the handover request message, the GUMMEI and the MME UE S1AP ID in the message are read.
  • the MME UE S1AP ID in the message is replaced with the MME UE S1AP ID (which is unique within the range of DeNB2) allocated by the UE, and the MME UE S1AP ID and the MME UE S1AP ID and the UE allocated by the MME are established and saved.
  • the DeNB2 finds the corresponding GUMMEI information according to the source MME UE S1AP ID carried in the message and the previously stored correspondence relationship, so as to correctly address the The MME performs path switching.
  • the above handover process may need to be improved on the existing base station (DeNB2 in the process), such as the need to allocate and replace the MME UE S1AP ID, parse and read the MME UE S1AP ID and GUMMI information in the handover request message, and establish and save the MME.
  • the UE S1AP ID and the GUMMEI Corresponding relationship between the UE S1AP ID and the GUMMEI, and searching for the GUMMEL when the UE establishes the connection according to the correspondence relationship
  • the following describes the process of the base station addressing the core network node in the handover process in the following embodiments for the above four handover scenarios.
  • Embodiment 1 Describe the handover process of scenario 1 (DeNB1 -> RN1)
  • the DeNB1 and the MME respectively store a pair of eNB UE S1AP IDs (denoted as eNB UE S1AP ID1) and MME UE S1AP ID (denoted as MME UE S1AP ID2) for identifying a UE.
  • eNB UE S1AP ID1 eNB UE S1AP ID1
  • MME UE S1AP ID2 eNB UE S1AP ID2
  • MME UE S1AP ID2 MME UE S1AP ID2
  • the MME UE S1 AP ID carried in the message should be unique.
  • Adopt the following two Current mode:
  • the DeNB1 Before the DeNB1 sends the handover request message to the RN1, it is required to retrieve and determine whether the MME UE SIAP ID2 allocated by the MME is unique in the DeNB1 when the UE establishes the connection. If it is unique, the MME UE SIAP ID2 allocated by the MME for the UE need not be replaced with the DeNB1. The corresponding S1 link identifier assigned to the UE, but the correspondence between the MME UE SIAP ID2 and the GUMMEI allocated by the MME needs to be established and saved, as shown in Table 2b; if not unique, the DeNB1 allocates the MME UE SIAP ID3 to the UE.
  • the DeNB1 establishes and holds the MME-assigned MME UE SIAP ID2, the self-assigned MME UE SIAP ID3 and the GUMMEI Correspondence between the two), as shown in Table 2a.
  • the RN1 After receiving the handover request message, the RN1 stores the MME UE S1AP ID2 (as shown in Table 2b) or the MME UE SIAP ID3 (as shown in Table 2a) carried in the message.
  • the DeNB1 does not need to retrieve and determine the uniqueness of the MME UE SIAP ID2 allocated by the MME in the DeNB1, but allocates the MME UE SIAP ID3 to the UE, and ensures that the MME UE SIAP ID3 is unique within the range of DeNB1, and allocates the MME to the UE.
  • the MME UE SIAP ID2 is replaced with the MME UE SIAP ID3 allocated by the UE for itself, and then the DeNB1 establishes and holds the correspondence between the MME-assigned MME UE SIAP ID2 and the self-assigned MME UE S1AP ID3 GUMMEI;), as shown in Table 2a .
  • RN1 After receiving the handover request message, RN1 saves the MME UE S1AP ID3 carried in the message (as shown in Table 2a). After the UE successfully accesses the target node RN1, the RN1 initiates a path switching process to the DeNB1. The RN1 allocates the eNB UE SIAP ID4 to the UE, and sends it to the DeNB 1 by carrying the path switching request message.
  • the DeNB1 After receiving the path switching request message sent by the RN1, the DeNB1 converts the source MME UE SIAP ID3 of the UE into the MME allocated MME UE in the message if the DeNB1 replaces the MME UE SIAP ID2 of the UE with the MME UE SIAP ID3. SIAP ID2; if the previous DeNB1 does not perform identity replacement, then in the message The MME UE SIAP ID does not need to be replaced, and is still the MME UE SIAP ID2 allocated by the MME. Then, the DeNB1 finds the MME when the UE establishes the connection according to the previously stored correspondence, and routes the message to the corresponding MME, so as to correctly address the core network node in the handover process.
  • Table 2a shows the S1 link identifiers recorded by each node and their corresponding relationships, corresponding to the case where the DeNB1 performs identity replacement.
  • Table 2b shows the S1 link identifiers recorded by each node and their corresponding relationships, corresponding to the case where the DeNB1 does not perform identity replacement.
  • Table 2b List of correspondences stored by each node in DeNB 1 -> RN1 handover
  • the X2 handover procedure of DeNB1 -> RN1 provided by the embodiment of the present invention may be as shown in FIG. 5 Show, including:
  • Step 1 the DeNB1 decides to switch the UE to the RN1 according to the measurement report of the UE, and determines the S1 link identifier that needs to be carried in the handover request message, and establishes the S1 link identifier and the GUMMEI (the GUMMEI when the GUMMEI is the UE connection establishment) Correspondence of ).
  • the DeNB1 may determine the MME UE S1AP ID that needs to be carried in the handover request message, and establish a correspondence between the MME UE S1AP ID and the GUMMEI.
  • Result 1 The DeNB1 determines that the MME UE S1AP ID2 allocated by the MME is carried in the handover request message, and the correspondence between the MME UE S1AP ID2 and the GUMMEI is established, and the MME corresponding to the GUMMEI is the DeNB1. Recorded MME connected to the UE;
  • the DeNB1 determines that the MME UE S1AP ID3 is carried in the handover request message, and establishes the correspondence between the MME UE S1AP ID2 allocated by the MME for the UE and the MME UE S1AP ID3 and GUMMEI allocated by the DeNB1 to the UE.
  • the MME corresponding to the GUMMEI is the MME to which the UE is connected recorded by the DeNB1.
  • Step 2 The DeNB1 sends a handover request message to the RN1, where the MME UE S1AP ID determined by the foregoing step is carried.
  • Step 3 The RN1 returns a handover request acknowledgement message to the DeNB1.
  • Steps 4 ⁇ 5 DeNB1 sends an RRC Connection Reconfiguration message to the UE, and sends a SN Status Transfer message to RN1.
  • Step 6 The UE detaches from the source cell and synchronizes to the target cell, and then sends an RRC connection reconfiguration complete message to the RN1.
  • Step 7 The RN1 sends a path switching request message to the DeNB1, where the source MME UE S1AP ID is carried, and the source MME UE S1AP ID is the MME UE S1AP ID carried in the handover request message sent by the DeNB1 to the RN1, where is the MME UE.
  • Step 8 The DeNB1 obtains the UE connection when the UE is connected according to the source MME UE S1AP ID and the correspondence information recorded by the DeNB in the path switching request message.
  • the GUMMEI information, and the path switching request message is forwarded to the corresponding MME according to the GUMMEI.
  • the DeNB1 records the MME UE S1AP according to the record.
  • the corresponding relationship between the ID2 and the GUMMEI and the source MME UE S1AP ID in the path switching request message may determine the MME when the corresponding UE is connected; if the source MME UE S1AP ID carried by the DeNB1 in the sent path switching request message is the MME UE S1AP ID3 (that is, the SI link identifier replacement is performed), in this step, the DeNB1 can determine the MME when the corresponding UE is connected according to the corresponding relationship between the MME UE S1AP ID3, the MME UE S1AP ID2 and the GUMMEI.
  • the DeNB1 may further switch the path according to the recorded correspondence relationship.
  • the MME UE S1AP ID3 in the request message is replaced with the MME UE S1AP ID2 allocated by the MME.
  • Step 9 The MME returns a path switching request acknowledgement message to the DeNB1.
  • Step 10 The DeNB1 forwards the path switching request acknowledgement message to the RN1.
  • Step 11 The RN1 sends a UE context release message to the DeNB1.
  • the mapping between the MME UE S1AP ID and the GUMMEI is established after the DeNB1 determines the handover, where the MME UE S1AP ID is unique in the DeNB1, and the GUMMEI is the MME to which the UE is connected when the UE is attached. GUMMEI, therefore, after receiving the path switching request message sent by the RN1, the DeNB1 can find the GUMMEI corresponding to the source MME UE S1AP ID by using the correspondence established by the DeNB1 according to the source MME UE S1AP ID carried in the message. Thereby the MME is correctly addressed.
  • Embodiment 2 Describe the handover process of scenario 2 (RN1->RN2)
  • the DeNB1 and the MME to which the RN1 and the RN1 belong respectively store the corresponding S1 link identifier, as shown in Table 3a or Table 3b, including the eNB UE S1AP ID and the MME UE S1AP ID.
  • the RN1 sends a handover request message to the DeNB1, where the message carries the DeNB1 allocated by the DeNB1 in the UE attach procedure (or the establishment of the connection procedure).
  • the DeNB1 After receiving the handover request message, the DeNB1 can be processed in two ways: Mode 1: Establish and save the MME UE S1AP ID2 allocated by the MME, and the MME UE S1AP ID3 allocated by the DeNB1 and the GUMMEI when the corresponding UE establishes the connection. Correspondence, as shown in Table 3a.
  • the DeNB1 re-assigns the MME UE S1AP ID5 to the RN2, and replaces the MME UE S1AP ID3 carried in the handover request message with the MME UE S1AP ID5, and further deletes the MME UE S1AP ID3, and then establishes and saves the MME allocation.
  • the correspondence between the MME UE S1AP ID2, the self-assigned MME UE S1AP ID5, and the GUMMEI when the UE establishes a connection is as shown in Table 3b.
  • the RN2 After receiving the handover request message forwarded by the DeNB 1, the RN2 saves the MME UE S1AP ID3 (for mode 1) or MME UE S1AP ID5 (for mode 2) allocated by the DeNB1 carried in the handover request message.
  • the RN2 After the UE successfully accesses the RN2, the RN2 initiates a path switching process to the DeNB1, and the RN2 allocates the eNB UE S1AP ID6 to the UE, and sends the path to the DeNB1. Then the DeNB1 addressing to the MME may include:
  • the DeNB1 finds the source MME UE S1AP ID carried in the path switching request (for the first mode, which is the MME UE S1AP ID3; and for the mode 2, which is the MME UE S1AP ID5), and the DeNB1 finds the UE to establish a connection according to the saved correspondence relationship.
  • the MME then routes the message to the corresponding MME, so as to correctly address the core network node during the handover process.
  • MME UE S1AP MME UE S1AP MME UE S1AP
  • ID3 (DeNB1 sub-ID3 (DeNB1 allocation) ID3 (DeNB1 allocation)
  • ID6 (RNl allocation) ID4, 6
  • Table 3b shows the S1 link identifiers recorded by each node and their corresponding relationships, corresponding to the above manner 2.
  • Table 3a List of correspondences stored by each node in RN1 -> RN2 handover
  • the RN1->RN2 X2 handover process provided by the embodiment of the present invention may be as shown in FIG. 6, and includes: Step 1 ⁇ 2, the RN1 determines the handover according to the measurement report of the UE, and sends a handover request message to the DeNB1, where the MME UE S1AP ID3 allocated by the DeNB1 in the UE attach procedure is carried.
  • Step 3 The DeNB1 establishes a correspondence between the MME UE S1AP ID and the GUMMEI when the UE establishes a connection, and forwards a handover request message to the RN2, where the MME UE S1AP ID is carried.
  • the DeNB1 may establish a correspondence between the MME UE S1AP ID2, the MME UE S1 AP ID3, and the GUMMEI of the UE, and retain the MME UE S1AP ID3 carried in the handover request message (corresponding to the foregoing manner 1;); It is also possible to allocate the MME UE S1AP ID5 to the RN2, establish a correspondence between the MME UE S1AP ID2, the MME UE S1AP ID5 and the GUMMEI of the UE, and replace the MME UE S1AP ID3 in the handover request message with the MME UE S1AP ID5 (corresponding to the above) Way two).
  • Steps 6-8 RN1 sends an RRC connection reconfiguration message to the UE, and sends a sequence number state transition message to the RN2.
  • Step 9 The UE detaches from the source cell and synchronizes to the target cell, and then sends an RRC connection reconfiguration complete message to the RN2.
  • Step 10 The RN2 sends a path switching request message to the DeNB1, where the source MME UE S1AP ID is carried.
  • the source MME UE S1AP ID is the MME UE S1AP ID carried in the handover request message sent by the DeNB1 to the RN2, where is the MME UE.
  • Step 11 The DeNB1 obtains the GUMMEI information when the UE is connected to the MME UE S1AP ID carried in the path switching request message according to the information of the MME UE S1AP ID and the GUMMEI, and the corresponding information is obtained according to the GUMMEI.
  • the MME forwards the path switching request message.
  • the DeNB1 forwards the handover request message, the identity replacement is performed.
  • the DeNB1 is configured according to the source MME UE S1AP ID5 carried in the path switching request message, and the MME UE S1AP ID5 and MME UE S1AP ID2 saved by the DeNB1.
  • the corresponding relationship between the MME UE S1AP ID3, the MME UE S1AP ID2 and the GUMMEI saved by the DeNB1, and the MME corresponding to the source MME UE S1AP ID is determined.
  • the DeNB1 replaces the source MME UE S1AP ID carried in the path switching request message with the MME UE S1AP ID2 allocated by the MME according to the saved correspondence.
  • Steps 12-13 the MME returns a path switching request acknowledgement message to the RN2.
  • Step 14 ⁇ 15 RN2 sends a UE context release message to RN1.
  • the DeNB1 After receiving the handover request message, the DeNB1 establishes a correspondence between the MME UE S1AP ID and the GUMMEI, where the MME UE S1AP ID is unique in the DeNB1, and the GUMMEI is the UE recorded when the DeNB1 is attached to the UE.
  • the GUMMEI of the connected MME therefore, after receiving the path switching request message sent by the RN2, the DeNB1 can find the source MME UE S1AP according to the source MME UE S1AP ID carried in the message by using the correspondence established by the DeNB1.
  • the GUMMEI corresponding to the ID so that the MME is correctly addressed.
  • Embodiment 3 Describe the handover process of scenario 3 (DeNBl->RN3)
  • the DeNB1 and the MME respectively store the corresponding S1 link identifiers, as shown in Table 4, including the eNB UE S1AP ID and the MME UE S1AP ID.
  • the DeNB1 When the UE performs the handover of the DeNB1 -> RN3, the DeNB1 sends a handover request message to the DeNB2 to which the RN3 belongs.
  • the message carries the MME UE S1AP ID2 allocated by the MME for the UE and the GUMMEI information when the UE is connected to the DeNB1.
  • the DeNB2 reads from the message.
  • the MME UE S1AP ID2 and the GUMMEI information are obtained, the UE is allocated the MME UE S1AP ID3 that is unique within the DeNB2, and the MME UE S1AP ID2 in the message is replaced with the MME UE S1AP ID2 and the MME-assigned MME.
  • the correspondence between the MME UE S1AP ID3 and the GUMMEI when establishing a connection with the UE is as shown in Table 4.
  • the RN3 After receiving the handover request message forwarded by the DeNB2, the RN3 stores the MME UE S1AP ID3 allocated by the DeNB2 carried in the message. After the UE successfully accesses the RN3, the RN3 initiates a path switching process to the DeNB2, allocates the eNB UE S1AP ID4 to the UE, and sends it to the DeNB2.
  • the DeNB2 After receiving the path switching request message sent by the RN3, the DeNB2 finds the GUMMEI information when the UE establishes the connection according to the source MME UE S1AP ID3 and the previously stored corresponding relationship, and routes the message to the corresponding MME. The correct addressing to the core network node during the handover process is achieved.
  • Table 4 shows the S1 link identifiers recorded by each node and their correspondences.
  • Table 4 List of correspondences stored by each node in DeNB1 RN3 handover
  • the DeNB1->RN3 X2 handover process provided by the embodiment of the present invention may be as shown in FIG. 7, and includes:
  • Step 1 ⁇ 2 DeNB1 sends a handover request message to the DeNB2 to which the RN3 belongs according to the measurement report of the UE, where the MME UE S1AP ID2 allocated by the MME in the UE attach procedure, and the GUMMEL when the UE establishes the connection are carried.
  • Step 3 The DeNB2 obtains the MME UE S1AP ID2 and the GUMMEI when the UE is connected from the received handover request message, allocates the MME UE SIAP ID3 to the UE, and establishes the MME UE SIAP ID2, the MME UE, the SIAP ID3, and the UE connection. Corresponding relationship between the GUMMEIs, and then forwarding a handover request message to the RN3, which carries the MME UE S1AP ID3.
  • Step 9 The UE detaches from the source cell and synchronizes to the target cell, and then sends an RRC connection reconfiguration complete message to the RN3.
  • Step 10 The RN3 sends a path switching request message to the DeNB1, where the source MME UE SIAP ID is carried, and the source MME UE SIAP ID is the MME UE SIAP ID3 carried in the handover request message received by the RN3 from the DeNB2.
  • Step 11 The DeNB2 obtains the GUMMEI information corresponding to the source MME UE SIAP ID3 according to the source MME UE SIAP ID3 carried in the path switching request message and the mapping relationship between the MME UE SIAP ID3 and the GUMMEI recorded by the DeNB2, and according to The GUMMEI forwards a path switching request message to the corresponding MME.
  • the DeNB2 replaces the source MME UE SIAP ID3 carried in the path switching request message with the MME UE SIAP ID2 allocated by the MME according to the saved correspondence.
  • Steps 12-13 the MME returns a path switching request acknowledgement message to the RN3.
  • Steps 14-15 The RN3 sends a UE context release message to the DeNB1.
  • the DeNB2 to which the target RN3 belongs has established the correspondence between the MME UE SI AP ID and the GUMMEI after receiving the handover request message, where the MME UE SIAP ID is unique in the DeNB1, and the GUMMEI is the DeNB1 attached to the UE.
  • the GUMMEI of the MME to which the UE is connected is recorded. Therefore, after receiving the path switching request message sent by the RN3, the DeNB2 can find the corresponding relationship established by the DeNB2 according to the source MME UE SIAP ID carried in the message.
  • the source MME UE SIAP ID corresponds to the GUMMEI, thereby correctly addressing the MME.
  • Embodiment 4 Describe the handover process of scenario 4 (RN2 -> RN3)
  • the DeNB1 and the MME to which the RN2 and the RN2 belong respectively store the corresponding S1 link identifier, as shown in Table 5, including the eNB UE SIAP ID and MME.
  • the DeNB1 to which the RN2 belongs receives the handover request message sent by the RN2, and converts the MME UE SIAP ID3 allocated by the DeNB1 into the MME according to the correspondence established in the DeNB1 when the UE is attached. Assigning the MME UE SIAP ID2, and filling the GUMMEI IE into the GUMMEI corresponding to the MME connected by the UE, and then forwarding the message to the DeNB2 to which the RN3 belongs;
  • the DeNB2 reads the MME UE S1AP ID2 and the GUMMEI information from the message, allocates the MME UE S1AP ID5 unique to the UE in the range of the DeNB2, replaces the MME UE SIAP ID2 in the handover request message with the MME UE SIAP ID5, and establishes and saves the MME.
  • the corresponding relationship between the allocated MME UE SIAP ID2 and the self-assigned MME UE SIAP ID5 and GUMMEI is as shown in Table 5.
  • the target RN3 After receiving the handover request message forwarded by the DeNB2, the target RN3 saves the MME UE SIAP ID5 allocated by the DeNB2 carried therein.
  • the RN3 After the UE successfully accesses the target RN3, the RN3 initiates a path switching process to the DeNB2, and the RN3 allocates the eNB UE SIAP ID6 to the UE, and then the DeNB2 addresses the MME in the same manner as the third embodiment.
  • Table 5 shows the S1 link identifiers recorded by each node and their correspondences.
  • Table 5 List of correspondences stored by each node in RN2 RN3 handover
  • GUMMEI GUMMEI GUMMEF
  • the RN2->RN3 X2 handover procedure provided by the embodiment of the present invention can be as shown in FIG. 8, and includes:
  • Step 1 ⁇ 2 the RN2 decides to switch according to the measurement of the UE, and sends a handover request message to the DeNB1, where the MME UE S1AP ID3 allocated by the DeNB1 in the UE attach procedure is carried.
  • Step 3 After receiving the handover request message, the DeNB1 converts the MME UE S1AP ID3 allocated by the DeNB1 into the MME according to the correspondence between the MME UE S1AP ID2 and the MME UE S1AP ID3, which is established in the DeNB1 when the UE is attached.
  • the MME UE S1AP ID2 is allocated, and the GUMMEI IE is filled in as the GUMMEI corresponding to the MME connected by the UE, and then the message is forwarded to the DeNB2 to which the RN3 belongs.
  • Step 4 After receiving the handover request message, the DeNB2 reads the MME UE S1AP ID2 and the GUMMEI information from the message, allocates the MME UE S1AP ID5 to the UE, and replaces the MME UE S1AP ID2 in the handover request message with the MME UE S1AP ID5, and A correspondence between the MME UE S1AP ID2 and the MME UE S1AP ID5 and the read GUMMEI is established and saved, and then the handover request message is forwarded to the RN3.
  • Steps 5-7 The RN3 sends a handover request acknowledgement message to the RN2.
  • Steps 8-11 The RN2 sends an RRC connection reconfiguration message to the UE, and sends a sequence number state transition message to the DeNB1.
  • Step 12 The UE detaches from the source cell and synchronizes to the target cell, and then sends an RRC connection reconfiguration complete message to the RN3.
  • Step 13 The RN3 sends a path switching request message to the DeNB2, where the source MME UE S1AP ID is carried, and the source MME UE S1AP ID is the MME UE S1AP ID carried in the handover request message received by the RN3, where is the MME UE S1AP ID5.
  • Step 14 The DeNB2 obtains the correspondence information of the source MME UE S1AP ID5 according to the source MME UE SIAP ID5 carried in the path switching request message and the MME UE SIAP ID2, the MME UE SIAP ID5 and the GUMMEI information recorded by the DeNB2.
  • the GUMMEI information, and the path switching request message is forwarded to the corresponding MME according to the GUMMEI.
  • the DeNB2 replaces the source MME UE S1AP ID5 carried in the path switching request message with the MME UE SIAP ID2 allocated by the MME according to the saved correspondence.
  • Steps 15 to 16 the MME returns a path switching request acknowledgement message to the RN3.
  • Steps 17 ⁇ 19, RN3 sends a UE context release message to RN2.
  • the DeNB1 to which the source RN2 belongs the GUMMEI information of the UE is carried in the handover request message and is forwarded to the DeNB2 to which the target RN3 belongs.
  • the DeNB2 After receiving the handover request message, the DeNB2 establishes the MME UE S1AP ID and the GUMMEI.
  • the MME UE S 1 AP ID is unique to the DeNB 1
  • the GUMMEI is the GUMMEI of the MME to which the UE is connected when the UE is attached.
  • the DeNB 2 can According to the source MME UE S1AP ID carried in the message, the GUMMEI corresponding to the source MME UE S1AP ID is found by using the correspondence established by the DeNB2, so that the MME is correctly addressed.
  • the embodiment of the present invention further provides a base station device, which can be applied to a process in which a user terminal switches from a source node to a target node, and the target node is a relay node.
  • the base station provided by the embodiment of the present invention may include: a handover request processing module 901, and a path switching request processing module 902, where:
  • the handover request processing module 901 is configured to send or forward a handover request to the target node. Corresponding relationship between the S1 link identifier of the user terminal and the core network node identifier, where the core network node corresponding to the core network node is the core network node connected to the user terminal
  • the path switching request processing module 902 is configured to determine, according to the source S1 link identifier carried in the path switching request message and the correspondence established by the handover request processing module 901, after receiving the path switching request message sent by the target node, The S1 link identifies the corresponding core network node identifier, and forwards the path switching request message to the core network node corresponding to the core network node identifier.
  • the base station device may further include a storage module, such as a database 903, for storing correspondence information established by the handover request processing module 901.
  • a storage module such as a database 903, for storing correspondence information established by the handover request processing module 901.
  • the function modules of the base station are further described below for different handover scenarios.
  • the handover request processing module 901 may be further configured to: before the handover request message is sent, determine that the core network node connected to the user terminal is allocated by the user terminal. Whether the S1 link identifier is unique within the range of the base station, and if so, carrying the S1 link identifier in the handover request message; otherwise, assigning the user terminal a unique S1 link identifier within the range of the base station, and assigning The S1 link identifier is carried in the handover request message;
  • the handover request processing module 901 allocates the S1 link identifier to the user terminal, the core network is established.
  • the path switching request processing module 902 is further configured to: when the switching request processing module 901 sends the handover request message, when the S1 link identifier is allocated to the user terminal and carried in the handover request message, the handover request processing module 901 is established. Corresponding The source S1 link identifier allocated by the handover request processing module 901 carried in the path switching request message is replaced by the S1 link identifier allocated by the core network node for the user terminal.
  • the handover request processing module 901 may be further configured to allocate the user terminal to be unique within the base station before sending the handover request message.
  • the S1 link identifier is carried in the handover request message.
  • the correspondence relationship established by the handover request processing module 901 includes: an S1 link identifier allocated by the core network node for the user terminal, and a handover request processing module 901 allocates the user terminal.
  • the path switching request processing module 902 is further configured to: after receiving the path switching request message, according to the correspondence established by the switching request processing module 901, the switching request processing module 901 carried in the received path switching request message is The source S1 link identifier allocated by the user terminal is replaced with the S1 link identifier assigned by the core network node to the user terminal.
  • the handover request processing module 901 is further configured to allocate, after receiving the handover request message, the unique S in the base station range of the user terminal.
  • the correspondence established by the handover request processing module 901 includes: a core network The S1 link identifier assigned by the node to the user terminal, the S1 link identifier assigned by the handover request processing module to the user terminal, and the corresponding relationship of the core network node identifier; the path switching request processing module 902 can also be used in After receiving the path switching request message, the source S1 link identifier carried in the received path switching request message is replaced with the S1 allocated by the core network node to the user terminal according to the corresponding relationship established by the switching request processing module 901.
  • Link identifier, the source S1 link identifier is the S1 allocated by the base station to the user terminal Link ID.
  • the handover request processing module 901 is further configured to forward the handover request message. And obtaining, by the base station, the S1 link identifier that is allocated by the base station to the user equipment, and the corresponding relationship established by the handover request processing module 901 is: the acquired S1 chain allocated by the base station to the user terminal.
  • the path identifier, the S1 link identifier assigned by the core network node when the user terminal is connected, and the corresponding relationship of the core network node identifier; the path switching request processing module 902 is further configured to receive the path switching request message.
  • the source S1 link identifier carried in the received path switching request message is replaced with the S1 link identifier allocated by the core network node to the user terminal according to the corresponding relationship established by the handover request processing module 901, the source The S1 link identifier is an S1 link identifier allocated by the base station to the user terminal.
  • the handover request processing module 901 may be further configured to allocate the uniqueness in the base station to the user terminal before forwarding the handover request message.
  • the S1 link is identified and carried in the handover request message;
  • the correspondence established by the handover request processing module 901 includes: an S1 link identifier re-allocated by the base station to the user terminal, and a core network node connected at the user terminal The S1 link identifier assigned thereto and the corresponding relationship of the core network node identifiers;
  • the path switching request processing module 902 is further configured to: after receiving the path switching request message, according to the establishment established by the handover request processing module 901 The corresponding relationship, the source S1 link identifier carried in the received path switching request message is replaced by the S1 link identifier allocated by the core network node to the user terminal, and the source S1 link identifier is the base station as the user The S1 link identifier assigned by the terminal
  • the handover request processing module 901 may be further configured to allocate the S1 link identifier to the user terminal and replace the handover with the handover request message 901 before forwarding the handover request message.
  • An S1 link identifier that is allocated by the core network node that is carried in the request message to the user terminal, and the identifier of the core network node that is connected to the user terminal is obtained from the handover request message; and the correspondence established by the handover request processing module 901 is obtained.
  • the relationship includes: an S1 link identifier allocated by the core network node for the user terminal, an S1 link identifier allocated by the handover request processing module 901 for the user terminal, and a core network node identifier obtained from the handover request message.
  • the path switching requesting module 902 is further configured to: after receiving the path switching request message, And replacing the source S1 link identifier in the path switch request message with the S1 link identifier allocated by the core network node for the user terminal, where the source S1 link identifier is The S1 link identifier assigned by the base station to the user terminal.
  • the handover request processing module 901 may be further configured to: before the forwarding the handover request message, the base station carried in the handover request message
  • the S1 link identifier allocated when the user terminal is attached is replaced with the S1 link identifier allocated by the core network node for the user terminal, and the identifier of the core network node connected to the user terminal is added in the handover request message; and, at the receiving After the handover request message is forwarded to the other base station, the user terminal is allocated a unique S1 link identifier in the range of the base station, and the core network node carried in the handover request message is replaced by the allocated S1 link identifier.
  • the S1 link identifier allocated by the user terminal; the correspondence established by the handover request processing module 901 includes: the correspondence established by the base station to which the target relay node belongs includes: the core network node allocates the user terminal
  • the S1 link identifier, the handover request processing module 901 is an S1 link identifier assigned to the user terminal, and a correspondence relationship of the core network node identifiers obtained from the handover request message.
  • the path switching request processing module may be further configured to: after receiving the path switching request message, replace the source S1 link identifier carried in the path switching request message with the core network node according to the correspondence established by the switching request processing module 901 An S1 link identifier that is allocated to the user terminal, where the source S1 link identifier is an S1 link identifier that is allocated by the handover request processing module to the user terminal.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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Abstract

La présente invention se rapporte à un procédé et à un dispositif pour l'adressage d'un nœud de cœur de réseau au cours d'une procédure de transfert intercellulaire. Le procédé et le dispositif selon l'invention sont appliqués à un terminal d'utilisateur au cours d'une procédure de transfert intercellulaire d'un nœud source à un nœud relais (RN) cible. Le procédé selon l'invention comprend les étapes suivantes : une station de base, à laquelle appartient le RN cible, transmet ou transfère un message de demande de transfert intercellulaire au RN cible, et établit des relations de correspondance entre des identifiants de liaison S1 du terminal d'utilisateur et des identifiants du nœud de cœur de réseau ; après réception d'un message de demande de commutation de chemin transmis par le nœud cible, la station de base détermine, sur la base d'un identifiant de liaison S1 source contenu dans le message de demande de commutation de chemin et des relations de correspondance établies par la station de base, un identifiant de nœud de cœur de réseau correspondant à l'identifiant de liaison S1 source, et transfère le message de demande de commutation de chemin au nœud de cœur de réseau correspondant à l'identifiant de nœud de cœur de réseau. La solution technique de la présente invention permet de résoudre le problème lié au fait que la station de base ne peut pas adresser correctement le nœud de cœur de réseau durant le transfert intercellulaire dans l'architecture de réseau comprenant le RN.
PCT/CN2011/072495 2010-04-07 2011-04-07 Procédé et dispositif pour l'adressage d'un nœud de cœur de réseau au cours d'une procédure de transfert intercellulaire WO2011124135A1 (fr)

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