WO2011124135A1 - 一种切换过程中寻址核心网节点的方法及其装置 - Google Patents

一种切换过程中寻址核心网节点的方法及其装置 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)
French (fr)
Inventor
贾贝贝
汪颖
杨义
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0064Transmission or use of information for re-establishing the radio link of control information between different access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W40/00Communication routing or communication path finding
    • H04W40/34Modification of an existing route
    • H04W40/36Modification of an existing route due to handover
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/047Public 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

一种切换过程中寻址核心网节点的方法及其装置,应用于用户终端从源节点切换到目标中继节点的过程,该方法包括:目标中继节点归属的基站向目标中继节点发送或转发切换请求消息,建立用户终端的S1链路标识与核心网节点标识的对应关系;所述基站在接收到目标节点发送的路径倒换请求消息后,根据路径倒换请求消息中携带的源S1链路标识,以及该基站建立的对应关系,确定与该源S1链路标识对应的核心网节点标识,并向与该核心网节点标识对应的核心网节点转发路径倒换请求消息。采用本发明可解决引入中继节点的网络架构中进行切换时基站无法正确寻址核心网节点的问题。

Description

一种切换过程中寻址核心网节点的方法及其装置 本申请要求以下中国专利申请的优先权:
于 2010年 4月 7日提交中国专利局, 申请号为 2010101430193, 发明名称为 "一种切换过程中寻址核心网节点的方法及其装置"的中 国专利申请。 技术领域
本发明涉及无线通信领域,尤其涉及一种切换过程中寻址核心网 节点的方法及其装置。 背景技术
在 LTE-A ( Long Term Evolution-Advanced )系统, 为了增加网络 覆盖引入了中继节点 (Relay Node, 以下筒称为 RN )。 RN以无线的 方式与基站( Donor Evolved Node B , DeNB )相连。 它们之间的无线 接口称为 Un接口。 UE ( User Equipment, 用户设备或用户终端 )可 以在 RN与 DeNB、 RN与 RN之间进行切换。
在未来的移动通信系统, 例如后三代 ( B 3G: Beyond Third Generation ) 中或 LTE-A, 系统将提供更高的峰值数据速率和小区吞 吐量, 同时也需要更大的带宽。 目前 2GHz以下的未分配带宽已经很 少, B 3G 系统需要的部分或全部带宽只能在更高的频段上, 例如 3GHz以上寻找。 频段越高, 电波传播衰减的越快, 传输距离越短, 因此同样覆盖区域下, 要保证连续覆盖, 需要更多的基站, 由于基站 通常具有较高的造价, 这无疑会增加布网成本。 为了解决布网成本以 及覆盖问题, 各厂商和标准化组织开始研究将中继引入到蜂窝系统 中, 以增加覆盖。
图 1为 LTE-A系统引入 RN后的网络架构。如图所示, RN通过 eNB下的 donor cell (施主小区)接入到核心网, RN与核心网之间没 有直接的有线接口,每个 RN可以控制一个或多个小区。在此架构下, UE和 RN之间的接口称为 Uu , 而 RN和 DeNB之间的接口称为 Un。 一个 DeNB下面可以连接多个 RN,而一个 RN只能连接到一个 DeNB 上。
如图 2所示, 在 LTE-A Relay ( LTE-A中继) 网络中, UE在 RN 与 DeNB之间以及 RN与 RN之间进行切换,有 6种典型的切换场景:
( 1 ) DeNBl— >RN1
( 2 ) RN1— >DeNBl
( 3 ) RN1— >RN2
( 4 ) DeNBl— >RN3
( 5 ) RN2— > DeNB2
( 6 ) RN2— >RN3
目前提出了四种候选协议栈架构。 在候选架构 2和 4中, DeNB 具有 S1AP和 X2AP代理功能, RN和 DeNB之间只建立一个 S1接口 和一个 X2接口。
目前在 X2切换过程中, 目标基站寻址核心网的方法是: 源 eNB 向目标 eNB 发送切换请求消息, 消息中携带 GUMMEI ( Globally Unique MME Identifier, 全球唯一 MME标识 )信息, GUMMEI信息 是 MME的全球唯一标识,由 PLMN ID、 MME Group ID和 MME code 组成, 每一个 GUMMEI对应唯——个 MME ( Mobility Management Entity,移动性管理实体)。 目标 eNB根据 GUMMEI信息寻址 MME, 向 UE注册的 MME发起路径倒换过程。
发明人在实现本发明的过程中, 发现现有技术至少存在以下缺 陷:
在候选架构 2和 4中, 当 UE发生切换到的目标节点为 RN的场 景时, 目标节点 RN向其所属的 DeNB发起路径倒换过程, 路径倒换 请求消息中没有 GUMMEI信息, DeNB将无法正确寻址到 MME。 虽 然路径倒换请求消息有 source MME UE S1AP ID信息,但是 MME UE S1AP ID只在一个 MME范围内唯一标识一个 UE, 有可能出现不同 的 MME分配给不同 UE的 MME UE S1AP ID相同, 当不同的 UE同 时切换到同一个 DeNB下的相同或不同 RN时, DeNB无法确定 source MME UE Sl-AP ID对应着哪个 MME,因而仍无法正确寻址到 MME。 发明内容
本发明实施例提供了一种切换过程中寻址核心网节点的方法及 其装置,用以解决引入中继节点的网络架构中进行切换时基站无法正 确寻址核心网节点的问题。
本发明实施例提供的切换过程中寻址核心网节点的方法,应用于 用户终端从源节点切换到目标节点的过程, 且目标节点是中继节点, 该方法包括:
目标中继节点归属的基站向目标中继节点发送或转发切换请求 消息, 建立用户终端的 S1链路标识与核心网节点标识的对应关系, 所述核心网节点标识对应的核心网节点是所述用户终端连接的核心 网节点;
所述基站在接收到目标中继节点发送的路径倒换请求消息后,根 据所述路径倒换请求消息中携带的源 S1链路标识, 以及该基站建立 的所述对应关系, 确定与该源 S1链路标识对应的核心网节点标识, 并向与该核心网节点标识对应的核心网节点转发路径倒换请求消息。
本发明实施例提供的基站, 该基站包括:
切换请求处理模块,用于向目标中继节点发送或转发切换请求消 息, 并建立用户终端的 S1链路标识与核心网节点标识的对应关系, 所述核心网节点标识对应的核心网节点是所述用户终端连接的核心 网节点;
路径倒换请求处理模块,用于在接收到目标中继节点发送的路径 倒换请求消息后, 根据所述路径倒换请求消息中携带的源 S1链路标 识以及所述切换请求处理模块建立的所述对应关系, 确定与该源 S1 链路标识对应的核心网节点标识,并向与该核心网节点标识对应的核 心网节点转发路径倒换请求消息。 本发明的上述实施例,通过目标中继节点所属的基站建立用户终 端的 S1链路标识与核心网节点标识的对应关系, 使该目标中继节点 所属的基站在接收到目标中继节点发送的路径倒换请求消息后,能够 根据所述路径倒换请求消息中携带的源 S1链路标识, 以及该基站建 立的所述对应关系,确定与该源 S 1链路标识对应的核心网节点标识, 并向与该核心网节点标识对应的核心网节点转发路径倒换请求消息, 从而实现基站正确寻址核心网节点。 附图说明
图 1 为现有技术中包含 RN的 E-UTRAN网络架构示意图; 图 2为现有技术中中继网络的 6种切换场景示意图;
图 3为现有技术中 UE附着流程示意图;
图 4为现有技术中 X2切换流程示意图;
图 5为本发明实施例一中 DeNBl到 RN1的切换流程示意图; 图 6为本发明实施例二中 RN1到 RN2的切换流程示意图; 图 7为本发明实施例三中 DeNBl到 RN3的切换流程示意图; 图 8为本发明实施例四中 RN2到 RN3的切换流程示意图; 图 9为本发明实施例提供的基站设备的结构示意图。 具体实施方式
针对现有技术存在的上述问题,本发明实施例提供了 DeNB寻址 核心网节点的技术方案。本发明实施例提供的技术方案利用候选架构 2和 4中 DeNB能够解析、 读取消息中的信息, 分配、 替换 S1链路 标识(S1AP ID ), 建立并保存与核心网节点标识的映射关系, 从而使 得 DeNB可以正确寻址到核心网节点。
为了更加清楚描述本发明实施例, 下面首先描述现有技术中 UE 附着 RN的流程以及 X2切换流程。
参见图 3, 为现有技术中 UE附着 RN的流程示意图。 如图所示, UE接入 RN进行附着时, RN向 MME发送初始 UE消息, 包含 RN 为 UE分配的一个 S1链路标识: eNB UE SIAP ID(记为 eNB UE SIAP ID1 ); DeNB收到该条消息后,将其中的 eNB UE S1AP ID1修改为自 己为 UE分配的 eNB UE SIAP ID (记录为 eNB UE SIAP ID2 ), 然后 再将该条消息转发给 MME。 MME收到初始 UE消息后, 为该 UE分 配一个 S1链路标识: MME UE SIAP ID(记录为 MME UE SIAP ID3 ), 与收到的 eNB UE SIAP ID2对应存储起来。 MME UE SIAP ID3在一 个 MME内唯一标识一个 UE。 此后 MME根据收到的 S1-AP消息中 的 MME UE SIAP ID3来区分 UE。 MME向 RN所属的 DeNB发送初 始上下文建立请求, 该消息中包含了 MME为 UE分配的 MME UE SIAP ID3。 DeNB将收到的 MME UE SIAP ID3替换为自己分配的 MME UE SIAP ID (记录为 MME UE SIAP ID4 ), 与自己为 UE分配 的 eNB UE SIAP ID2、 RN为 UE分配的 eNB UE SIAP ID1一起对应 存储起来。 然后 DeNB将初始上下文建立请求消息转发给 RN, 用于 在 RN中建立 UE上下文。 RN将自己为 UE分配一个 eNB UE SIAP ID1 和收到的 MME UE SIAP ID4一起对应存储起来。 RN随后向 MME发送初始上下文建立响应消息进行确认。上述 UE附着过程中, 各个节点存储的对应关系可如表 1所示。
表 1
Figure imgf000007_0001
参见图 4, 为现有技术中 X2切换流程示意图, 如图 4所示, 源 基站根据 UE的测量结果进行切换判决, 选择合适的目标小区, 向目 标基站发送切换请求; 目标基站允许 UE接入的话, 向源基站返回切 换请求确认消息; 源基站向 UE发送切换命令 (即 RRC连接重配置 消息); UE收到切换命令后接入目标小区, 向目标小区发送 RRC (无 线网络资源控制 )连接重配置完成消息; 目标基站向核心网 MME发 送路径转换请求(或称路径倒换请求, 以下同), MME随后向 S-GW ( Serving Gateway, 服务网关)发送用户面路径更新请求; S-GW转 换下行传输路径后向 MME确认, MME再向目标基站确认。 目标基 站通知源基站释放 UE的资源。
下面将结合本发明中的附图, 对本发明中的技术方案进行清楚、 完整的描述, 显然, 所描述的实施例是本发明的一部分实施例, 而不 是全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没 有做出创造性劳动的前提下所获得的所有其他实施例,都属于本发明 保护的范围。
本发明实施例分别针对 Intra-DeNB切换到 RN、 Inter-DeNB切换 到 RN的场景, 提供了 DeNB寻址核心网节点的方法。
结合图 2所示的切换场景, Intra-DeNB切换到 RN 的场景可包括: 场景 1: 基站到该基站下的中继节点的切换, 如 DeNBl—>RNl 场景 2: 同一基站下的各中继节点之间的切换, 如 RN1—>RN2 针对场景 1、 2, 本发明实施例在上述切换过程中, DeNBl向目 标 RN发送或转发切换请求消息时, 建立 MME UE S1AP ID (该 ID 是 MME或 /和 DeNBl分配的,在 DeNBl范围内唯一 )与 UE建立连 接时的 GUMMEI的对应关系;目标 RN向 DeNBl发起路径倒换过程 中, DeNB 1根据路径倒换请求消息中携带的 source MME UE S1AP ID 以及之前存储的对应关系, 找到对应的 GUMMEI信息, 从而正确寻 址到 MME以完成路径倒换。
上述切换过程可能需要对现有的基站 (流程中的 DeNBl )进行 改进, 如需要由 DeNB判断 MME UE S1AP ID的唯一性, 分配、 替 换 MME UE S1AP ID , 建立并保存 MME/eNB UE S1AP ID 与 GUMMEI 的对应关系, 根据该对应关系查找 UE 建立连接时的 GUMMEI。
结合图 2所示的切换场景, Inter-DeNB切换到 RN的场景可包括: 场景 3:基站到另一基站下的中继节点的切换,如 DeNBl—>RN3 场景 4: 不同基站下的中继节点之间的切换, 如 RN2—>RN3 针对场景 3、 4, 本发明实施例在上述切换过程中, 目标 RN所属 的 DeNB2收到切换请求消息时,读取消息中的 GUMMEI和 MME UE S1AP ID信息,将消息中的 MME UE S1AP ID替换成自己为 UE分配 的 MME UE S1AP ID (在 DeNB2范围内唯一;), 建立并保存 MME分 配的 MME UE S1AP ID、 自己分配的 MME UE S1AP ID与 UE建立 连接时的 GUMMEI的对应关系; DeNB2收到目标 RN发起的路径倒 换请求消息后,根据消息中携带的 source MME UE S1AP ID以及之前 存储的对应关系,找到对应的 GUMMEI信息,从而正确寻址到 MME 以完成路径倒换。
上述切换过程可能需要对现有的基站 (流程中的 DeNB2 )进行 改进,如需要分配和替换 MME UE S1AP ID,解析和读取切换请求消 息中的 MME UE S1AP ID和 GUMMI信息, 建立并保存 MME UE S1AP ID与 GUMMEI的对应关系, 根据该对应关系查找 UE建立连 接时的 GUMMEL
下面针对以上 4种切换场景,用相应实施例对切换过程中基站寻 址核心网节点的过程进行详细描述。
实施例一: 描述场景 1 ( DeNBl—〉 RN1 ) 的切换过程
UE连接在 DeNBl上时, 根据现有机制, DeNBl和 MME分别 存储一对 eNB UE S1AP ID (记为 eNB UE S1AP ID1 )和 MME UE S1AP ID (记为 MME UE S1AP ID2 ), 用于标识一条 UE相关逻辑 SI 连接。 DeNBl保存相应的 GUMMEI信息,用于指示 UE连接的 MME, 如表 2a或表 2b所示。
当 UE进行 DeNBl—>RNl的切换, DeNBl向 RN1发送切换请 求消息时, 消息中携带的 MME UE S 1 AP ID应具有唯一性, 为保证 该消息中携带的 MME UE S1AP ID的唯一性, 可以采用以下两种实 现方式:
方式一
DeNBl向 RN1发送切换请求消息之前, 需要检索并判断 UE建 立连接时 MME分配的 MME UE SIAP ID2在 DeNBl内是否唯一, 如果唯一, 则不需要将 MME为该 UE分配的 MME UE SIAP ID2替 换成 DeNBl为该 UE分配的相应 S1链路标识, 但需要建立并保存 MME分配的 MME UE SIAP ID2与 GUMMEI之间的对应关系,如表 2b所示; 如果不唯一, 则 DeNBl为 UE分配 MME UE SIAP ID3 , 并保证该 MME UE SIAP ID3在 DeNBl范围内唯一, 并将 MME UE SIAP ID2替换成 MME UE SIAP ID3,然后 DeNBl建立并保存 MME 分配的 MME UE SIAP ID2、 自己分配的 MME UE SIAP ID3 与 GUMMEI之间的对应关系), 如表 2a所示。
RN1 收到切换请求消息后, 保存消息中携带的 MME UE S1AP ID2 (如表 2b所示 )或 MME UE SIAP ID3 (如表 2a所示)。
方式二
DeNBl不需要检索并判断 MME分配的 MME UE SIAP ID2在 DeNBl内的唯一性, 而是为 UE分配 MME UE SIAP ID3, 并保证该 MME UE SIAP ID3在 DeNBl范围内唯一, 并将 MME为 UE分配的 MME UE SIAP ID2替换成自己为 UE分配的 MME UE SIAP ID3,然 后 DeNBl建立并保存 MME分配的 MME UE SIAP ID2、 自己分配的 MME UE S1AP ID3 GUMMEI之间的对应关系;), 如表 2a所示。
RN1 收到切换请求消息后, 保存消息中携带的 MME UE S1AP ID3 (如表 2a所示)。 当 UE成功接入到目标节点 RN1后, RN1向 DeNBl发起路径倒换过程。 RN1为 UE分配 eNB UE SIAP ID4, 并 将其携带于路径倒换请求消息发送给 DeNB 1。
DeNBl收到 RN1发送的路径倒换请求消息后,如果之前 DeNBl 将该 UE的 MME UE SIAP ID2替换成 MME UE SIAP ID3, 则将该 消息中该 UE的 source MME UE SIAP ID3转换成 MME分配的 MME UE SIAP ID2; 如果之前 DeNBl未进行标识替换, 则对该消息中的 MME UE SIAP ID不需要作任何替换, 仍是 MME分配的 MME UE SIAP ID2。 之后, DeNBl根据之前存储的对应关系, 查找到 UE建 立连接时的 MME, 将该消息路由到对应的 MME, 从而实现切换过 程中正确寻址到核心网节点。
表 2a中示出了各节点所记录的 S1链路标识及其对应关系,对应 于 DeNBl进行标识替换的情况。
DeNBl— >RN1切换中各节点存储的对应关系列表
Figure imgf000011_0001
表 2b中示出了各节点所记录的 S1链路标识及其对应关系,对应 于 DeNBl不进行标识替换的情况。
表 2b: DeNB 1— >RN1切换中各节点存储的对应关系列表
Figure imgf000011_0002
本发明实施例提供的 DeNBl—>RNl的 X2切换流程可如图 5所 示, 包括:
步骤 1、 DeNBl根据 UE的测量报告决定切换该 UE到 RN1 , 并 确定出需要在切换请求消息中携带的 S1链路标识,以及建立 S1链路 标识与 GUMMEI (该 GUMMEI为 UE连接建立时的 GUMMEI ) 的 对应关系。
该步骤中, DeNBl 可以采用上述方式一或方式二确定出需要在 切换请求消息中携带的 MME UE S1AP ID, 以及建立 MME UE S1AP ID与 GUMMEI之间的对应关系。 通过该步骤, 可以得到两种结果: 结果一: DeNBl 确定出在切换请求消息中携带 MME 分配的 MME UE S1AP ID2, 并建立 MME UE S1AP ID2与 GUMMEI的对应 关系,该 GUMMEI所对应的 MME是 DeNBl所记录的该 UE连接的 MME;
结果二: DeNBl确定出在切换请求消息中携带自己分配的 MME UE S1AP ID3 , 并建立 MME为该 UE分配的 MME UE S1AP ID2、 DeNBl为该 UE分配的 MME UE S1AP ID3与 GUMMEI的对应关系, 该 GUMMEI所对应的 MME是 DeNBl所记录的该 UE连接的 MME。
步骤 2、 DeNBl向 RN1发送切换请求消息, 其中携带上述步骤 确定出的 MME UE S1AP ID。
步骤 3、 RN1向 DeNBl返回切换请求确认消息。
步骤 4~5、 DeNBl向 UE发送 RRC连接重配置消息, 并向 RN1 发送 SN Status Transfer (序列号状态转移 ) 消息。
步骤 6、 UE从源小区去附着, 并同步到目标小区, 然后向 RN1 发送 RRC连接重配置完成消息。
步骤 7、 RN1向 DeNBl发送路径倒换请求消息, 其中携带相应 的 source MME UE S1AP ID, 该 source MME UE S1AP ID为 DeNBl 发送给 RN1 的切换请求消息中携带的 MME UE S1AP ID, 此处为 MME UE S1AP ID2或 MME UE S1AP ID3。
步骤 8、 DeNBl 根据路径倒换请求消息中的 source MME UE S1AP ID 以及 DeNB 记录的对应关系信息, 获得 UE 连接时的 GUMMEI信息,并根据该 GUMMEI向对应的 MME转发路径倒换请 求消息。
该步骤中, 如果 DeNBl 在发送的路径倒换请求消息中携带的 source MME UE S1AP ID为 MME UE S1AP ID2(即 DeNBl没有进行 SI链路标识替换),则该步骤中 DeNBl根据其记录的 MME UE S1AP ID2与 GUMMEI的对应关系以及路径倒换请求消息中的 source MME UE S1AP ID, 可以确定出相应 UE连接时的 MME; 如果 DeNBl在 发送的路径倒换请求消息中携带的 source MME UE S1AP ID为 MME UE S1AP ID3 (即进行了 SI链路标识替换), 则该步骤中 DeNBl根 据其记录的 MME UE S1AP ID3、 MME UE S1AP ID2与 GUMMEI的 对应关系, 可以确定出相应 UE连接时的 MME。
如果 DeNBl在发送的路径倒换请求消息中携带的 source MME UE S1AP ID为 MME UE S1AP ID3 (即进行了 SI链路标识替换), 则 DeNBl 还可进一步根据其所记录的对应关系, 将该路径倒换请求消 息中的 MME UE S1AP ID3替换为 MME分配的 MME UE S1AP ID2。
步骤 9、 MME向 DeNBl返回路径倒换请求确认消息。
步骤 10、 DeNBl向 RN1转发路径倒换请求确认消息。
步骤 11、 RN1向 DeNBl发送 UE上下文释放消息。
通过以上流程可以看出, 由于 DeNBl 判决切换后建立了 MME UE S1AP ID与 GUMMEI的对应关系, 其中, MME UE S1AP ID在 DeNBl唯一, GUMMEI为 DeNBl在 UE附着时记录的该 UE所连接 的 MME的 GUMMEI, 因此, 当 DeNBl接收到 RN1发送的路径倒 换请求消息后, 能够根据该消息中携带的 source MME UE S1AP ID, 利用 DeNBl建立的对应关系, 查找到与该 source MME UE S1AP ID 对应的 GUMMEI, 从而正确寻址 MME。
实施例二: 描述场景 2 ( RN1->RN2 ) 的切换过程
UE连接在 RN1上时,根据现有机制, RN1、 RN1所属的 DeNBl 和 MME分别存储相应 S1链路标识,如表 3a或表 3b所示,包括 eNB UE S1AP ID和 MME UE S1AP ID。 当 UE在同一个 DeNB 下的不同 RN 间进行切换时, 如 RN1 ->RN2, RN1向 DeNBl发送切换请求消息, 消息中携带有在 UE附 着过程(或建立连接过程 )中由 DeNBl分配的在 DeNBl范围内唯一 的 MME UE S1AP ID3。
DeNBl收到该切换请求消息后, 可采用两种方式处理: 方式一: 建立并保存 MME分配的 MME UE S1AP ID2、 DeNBl 自己分配的 MME UE S1AP ID3与对应 UE在建立连接时的 GUMMEI 之间的对应关系, 如表 3a所示。
方式二: DeNBl重新为 UE分配 MME UE S1AP ID5供 RN2使 用, 将切换请求消息中携带的 MME UE S1AP ID3替换为 MME UE S1AP ID5, 并可进一步删除 MME UE S1AP ID3, 然后建立并保存 MME分配的 MME UE S1AP ID2、 自己分配的 MME UE S1AP ID5以 及 UE建立连接时的 GUMMEI之间的对应关系, 如表 3b所示。
RN2收到 DeNB 1转发的切换请求消息后, 保存切换请求消息中 携带的由 DeNBl分配的 MME UE S1AP ID3 (针对方式一 )或 MME UE S1AP ID5 (针对方式二)。
当 UE成功接入到 RN2后, RN2向 DeNBl发起路径倒换过程, RN2为 UE分配 eNB UE S1AP ID6,并将其携带于路径倒换请求消息 发送给 DeNBl。 随后 DeNBl寻址到 MME可包括:
DeNBl根据路径倒换请求中携带的 source MME UE S1AP ID(针 对方式一,其为 MME UE S1AP ID3;针对方式二,其为 MME UE S1AP ID5 ) , 以及 DeNBl根据保存的对应关系, 查找到 UE建立连接时的 MME, 将该消息路由到对应的 MME,从而实现切换过程中正确寻址 到核心网节点。
表 3a中示出了各节点所记录的 S1链路标识及其对应关系,对应 于上述方式一。
RN1— >RN2切换中各节点存储的对应关系列表
Figure imgf000014_0001
(DeNBl分配) (DeNBl分配)
MME UE S1AP MME UE S1AP ID2 ID2
( MME分配) ( MME分配)
MME UE S1AP MME UE S1AP MME UE S1AP
ID3 ( DeNBl 分 ID3( DeNBl分配) ID3 (DeNBl分配)
配)
eNB UE S1AP eNB UES1APID4 eNB UE S1AP
ID6 ( RNl分配) ID4、 6
( RN2分配) (RN1、 RN2分配)
GUMMEI" GUMMEF GUMMEI
(DeNBl分配) (DeNBl分配) ( UE 连 接 的
MME) 表 3b中示出了各节点所记录的 S1链路标识及其对应关系,对应 于上述方式二。
表 3a: RNl— >RN2切换中各节点存储的对应关系列表
Figure imgf000015_0001
本发明实施例提供的 RN1—>RN2 X2切换流程可如图 6所示, 包括: 步骤 1~2、 RN1根据 UE的测量报告决定切换, 并向 DeNBl发 送切换请求消息,其中携带在 UE附着过程中由 DeNBl分配的 MME UE S1AP ID3。
步骤 3、 DeNBl建立 MME UE S1AP ID与该 UE建立连接时的 GUMMEI之间的对应关系, 并向 RN2转发切换请求消息, 其中携带 MME UE S1AP ID。
该步骤中, DeNBl可建立该 UE的 MME UE S1AP ID2、 MME UE S 1 AP ID3和 GUMMEI之间的对应关系,并保留切换请求消息中携带 的 MME UE S1AP ID3(对应于上述方式一;);还可以为 RN2分配 MME UE S1AP ID5 ,建立该 UE的 MME UE S1AP ID2、 MME UE S1AP ID5 和 GUMMEI之间的对应关系, 并用 MME UE S1AP ID5替换切换请 求消息中的 MME UE S1AP ID3 (对应于上述方式二)。
步骤 4~5、 RN2向 RN1发送切换请求确认消息。
步骤 6~8、 RN1向 UE发送 RRC连接重配置消息, 并向 RN2发 送序列号状态转移消息。
步骤 9、 UE从源小区去附着, 并同步到目标小区, 然后向 RN2 发送 RRC连接重配置完成消息。
步骤 10、 RN2向 DeNBl发送路径倒换请求消息, 其中携带相应 的 source MME UE S1AP ID, 该 source MME UE S1AP ID为 DeNBl 发送给 RN2的切换请求消息中携带的 MME UE S1AP ID, 此处为 MME UE S1AP ID3或 MME UE S1AP ID5。
步骤 11、 DeNBl根据其记录的 MME UE S1AP ID与 GUMMEI 的对应关系信息, 获得与路径倒换请求消息中携带的 MME UE S1AP ID对应的 UE连接时的 GUMMEI信息, 并才艮据该 GUMMEI向对应 的 MME转发路径倒换请求消息。
该步骤中, 如果 DeNBl在转发切换请求消息时进行了标识替换
DeNBl根据路径倒换请求消息中携带的 source MME UE S1AP ID5, 以及 DeNBl保存的 MME UE S1AP ID5、 MME UE S1AP ID2与 GUMMEI的对应关系, 确定与该 source MME UE S1AP ID对应的 MME; 如果 DeNB 1在转发切换请求消息时未进行标识替换, 则该步 骤中, DeNBl根据路径倒换请求消息中携带的 source MME UE S1AP ID3, 以及 DeNBl保存的 MME UE S1AP ID3、 MME UE S1AP ID2 与 GUMMEI的对应关系, 确定与该 source MME UE S1AP ID对应的 MME。
进一步的, DeNBl 根据保存的上述对应关系, 将路径倒换请求 消息中携带的 source MME UE S1AP ID替换为 MME分配的 MME UE S1AP ID2。
步骤 12~13、 MME向 RN2返回路径倒换请求确认消息。
步骤 14~15、 RN2向 RN1发送 UE上下文释放消息。
通过以上流程可以看出,由于 DeNBl在接收到切换请求消息后, 建立了 MME UE S1AP ID与 GUMMEI的对应关系, 其中, MME UE S1AP ID在 DeNBl唯一, GUMMEI为 DeNBl在 UE附着时记录的 该 UE所连接的 MME的 GUMMEI, 因此, 当 DeNBl接收到 RN2 发送的路径倒换请求消息后, 能够根据该消息中携带的 source MME UE S1AP ID,利用 DeNBl建立的对应关系,查找到与该 source MME UE S1AP ID对应的 GUMMEI, 从而正确寻址 MME。
实施例三: 描述场景 3 ( DeNBl->RN3 ) 的切换过程
UE连接在 DeNBl上时, DeNBl和 MME分别存储相应 S1链路 标识, 如表 4所示, 包括 eNB UE S1AP ID和 MME UE S1AP ID。
当 UE进行 DeNBl—〉 RN3的切换, DeNBl向 RN3所属的 DeNB2 发送切换请求消息,消息中携带 MME为该 UE分配的 MME UE S1AP ID2和该 UE在连接 DeNBl时的 GUMMEI信息; DeNB2从消息中读 取 MME UE S1AP ID2和 GUMMEI信息, 为该 UE分配在 DeNB2范 围内唯一的 MME UE S1AP ID3, 并用其替换该消息中的 MME UE S1AP ID2, 并建立和保存 MME分配的 MME UE S1AP ID2、 自己分 配的 MME UE S1AP ID3与 UE建立连接时的 GUMMEI之间的对应 关系, 如表 4所示。 RN3 收到 DeNB2 转发的切换请求消息后, 保存消息中携带的 DeNB2所分配的 MME UE S1AP ID3。 当 UE成功接入到 RN3后, RN3向 DeNB2发起路径倒换过程, 为 UE分配 eNB UE S1AP ID4, 并将其携带于路径倒换请求消息发送给 DeNB2。
DeNB2收到 RN3发送的路径转换请求消息后, 根据该消息中携 带的 source MME UE S1AP ID3 , 以及之前存储的对应关系, 查找到 UE建立连接时的 GUMMEI信息, 将该消息路由到对应的 MME , 实 现了切换过程中正确寻址到核心网节点。
表 4中示出了各节点所记录的 S1链路标识及其对应关系 表 4 : DeNBl RN3切换中各节点存储的对应关系列表
Figure imgf000018_0001
本发明实施例提供的 DeNBl—>RN3 X2切换流程可如图 7所示, 包括:
步骤 1~2、 DeNBl根据 UE的测量报告向 RN3所属的 DeNB2发 送切换请求消息, 其中携带在 UE附着过程中由 MME分配的 MME UE S1AP ID2, 以及该 UE在建立连接时的 GUMMEL 步骤 3、 DeNB2从接收到的切换请求消息中获取 MME UE S1AP ID2和该 UE连接时的 GUMMEI,为该 UE分配 MME UE SIAP ID3, 并建立 MME UE SIAP ID2、 MME UE SIAP ID3和该 UE连接时的 GUMMEI之间的对应关系, 然后向 RN3转发切换请求消息, 其中携 带 MME UE S1AP ID3。
步骤 4~5、 RN3经 DeNB2向 DeNBl发送切换请求确认消息。 步骤 6~8、 DeNBl向 UE发送 RRC连接重配置消息,并经 DeNB2 向 RN3发送序列号状态转移消息。
步骤 9、 UE从源小区去附着, 并同步到目标小区, 然后向 RN3 发送 RRC连接重配置完成消息。
步骤 10、 RN3向 DeNBl发送路径倒换请求消息, 其中携带相应 的 source MME UE SIAP ID, 该 source MME UE SIAP ID为 RN3从 DeNB2接收到的切换请求消息中携带的 MME UE SIAP ID3。
步骤 11、 DeNB2根据路径倒换请求消息中携带的 source MME UE SIAP ID3 , 以及 DeNB2记录的该 UE的 MME UE SIAP ID3与 GUMMEI的对应关系信息,获得与 source MME UE SIAP ID3对应的 GUMMEI信息,并根据该 GUMMEI向对应的 MME转发路径倒换请 求消息。
进一步的, DeNB2根据保存的上述对应关系, 将路径倒换请求 消息中携带的 source MME UE SIAP ID3替换为 MME分配的 MME UE SIAP ID2。
步骤 12~13、 MME向 RN3返回路径倒换请求确认消息。
步骤 14~15、 RN3向 DeNBl发送 UE上下文释放消息。
通过以上流程可以看出, 由于目标 RN3所属的 DeNB2在接收到 切换请求消息后,建立了 MME UE SI AP ID与 GUMMEI的对应关系, 其中, MME UE SIAP ID在 DeNBl唯一, GUMMEI为 DeNBl在 UE 附着时记录的该 UE所连接的 MME的 GUMMEI, 因此, 当 DeNB2 接收到 RN3发送的路径倒换请求消息后, 能够根据该消息中携带的 source MME UE SIAP ID, 利用 DeNB2建立的对应关系, 查找到与 该 source MME UE SIAP ID对应的 GUMMEI, 从而正确寻址 MME。 实施例四: 描述场景 4 ( RN2— >RN3 ) 的切换过程
UE连接在 RN2上时, RN2、 RN2所属的 DeNBl和 MME分别 存储相应 S1链路标识, 如表 5所示, 包括 eNB UE SIAP ID和 MME
UE S1AP ID。
当 UE进行 RN2—>RN3切换时, RN2所属的 DeNBl收到 RN2 发送来的切换请求消息后, 根据 UE附着时在 DeNBl 中建立的对应 关系, 将消息中 DeNBl分配的 MME UE SIAP ID3转换成 MME分 配的 MME UE SIAP ID2, 并将 GUMMEI IE填写为 UE连接的 MME 对应的 GUMMEI, 然后将该消息转发到 RN3所属的 DeNB2;
DeNB2从消息中读取 MME UE S1AP ID2和 GUMMEI信息, 为 该 UE分配在 DeNB2范围内唯一的 MME UE S1AP ID5 ,用 MME UE SIAP ID5替换切换请求消息中的 MME UE SIAP ID2,并建立和保存 MME分配的 MME UE SIAP ID2和自己分配的 MME UE SIAP ID5 与 GUMMEI之间的对应关系, 如表 5所示。
目标 RN3收到 DeNB2转发的切换请求消息后,保存其中携带的 DeNB2分配的 MME UE SIAP ID5。
当 UE成功接入到目标 RN3后, RN3向 DeNB2发起路径倒换过 程, RN3为 UE分配 eNB UE SIAP ID6, 随后 DeNB2寻址到 MME 的方法同实施例三。
表 5中示出了各节点所记录的 S1链路标识及其对应关系 表 5 : RN2 RN3切换中各节点存储的对应关系列表
Figure imgf000020_0001
ID 5 S1-AP ID5 ID3 S1-AP ID3
( DeNB2分配) (DeNB2 分 ( DeNBl 分 (DeNBl 分
配) 配) 配)
eNB UE S1AP eNB UE eNB UE S-AP eNB UE
ID6 S1-AP ID6 ID4 S1-AP ID4
( RN3分配) ( RN3分配) ( RN2分配) ( RN2 分
配)
GUMMEI" GUMMEI GUMMEF GUMMEI
( DeNB2分配) ( UE连接的 ( DeNBl 分 ( UE连接的
MME ) 配) MME ) 本发明实施例提供的 RN2—>RN3 X2切换流程可如图 8所示, 包括:
步骤 1~2、 RN2根据 UE的测量 告决定切换, 并向 DeNBl发 送切换请求消息,其中携带在 UE附着过程中由 DeNBl分配的 MME UE S1AP ID3。
步骤 3、 DeNBl收到切换请求消息后,根据 UE附着时在 DeNBl 中建立的对应关系 ( MME UE S1AP ID2与 MME UE S1AP ID3的对 应关系), 将消息中 DeNBl分配的 MME UE S1AP ID3转换成 MME 分配的 MME UE S1AP ID2,并将 GUMMEI IE填写为 UE连接的 MME 对应的 GUMMEI, 然后将该消息转发到 RN3所属的 DeNB2。
步骤 4、 DeNB2接收到切换请求消息后,从消息中读取 MME UE S1AP ID2和 GUMMEI信息, 为该 UE分配 MME UE S1AP ID5, 用 MME UE S1AP ID5替换切换请求消息中的 MME UE S1AP ID2,并建 立和保存 MME UE S1AP ID2和 MME UE S1AP ID5与读取到的 GUMMEI之间的对应关系, 然后将该切换请求消息转发到 RN3。
步骤 5~7、 RN3向 RN2发送切换请求确认消息。
步骤 8~11、 RN2向 UE发送 RRC连接重配置消息, 并向 DeNBl 发送序列号状态转移消息。
步骤 12、 UE从源小区去附着, 并同步到目标小区, 然后向 RN3 发送 RRC连接重配置完成消息。 步骤 13、 RN3向 DeNB2发送路径倒换请求消息, 其中携带相应 的 source MME UE S1AP ID, 该 source MME UE S1AP ID为 RN3接 收到的切换请求消息中携带的 MME UE S1AP ID, 此处为 MME UE S1AP ID5。
步骤 14、 DeNB2根据路径倒换请求消息中携带的 source MME UE SIAP ID5 ,以及 DeNB2记录的该 UE的 MME UE SIAP ID2、 MME UE SIAP ID5与 GUMMEI的对应关系信息, 获得与 source MME UE S1AP ID5对应的 GUMMEI信息,并才艮据该 GUMMEI向对应的 MME 转发路径倒换请求消息。
进一步的, DeNB2根据保存的上述对应关系, 将路径倒换请求 消息中携带的 source MME UE S1AP ID5替换为 MME分配的 MME UE SIAP ID2。
步骤 15~16、 MME向 RN3返回路径倒换请求确认消息。
步骤 17~19、 RN3向 RN2发送 UE上下文释放消息。
通过以上流程可以看出, 由于源 RN2所属的 DeNBl将 UE连接 的 GUMMEI 信息携带于切换请求消息转发到目标 RN3 所属的 DeNB2, DeNB2在接收到切换请求消息后,建立了 MME UE S1AP ID 与 GUMMEI的对应关系, 其中, MME UE S 1 AP ID在 DeNB 1唯一, GUMMEI为 DeNBl在 UE附着时记录的该 UE所连接的 MME的 GUMMEI,因此,当 DeNB2接收到 RN3发送的路径倒换请求消息后, 能够根据该消息中携带的 source MME UE S1AP ID, 利用 DeNB2建 立的对应关系, 查找到与该 source MME UE S1AP ID 对应的 GUMMEI, 从而正确寻址 MME。
基于相同的技术构思, 本发明实施例还提供了一种基站设备, 可 应用于用户终端从源节点切换到目标节点的过程,且目标节点是中继 节点
如图 9所示, 本发明实施例提供的基站可包括: 切换请求处理模 块 901、 路径倒换请求处理模块 902, 其中:
切换请求处理模块 901 , 用于向目标节点发送或转发切换请求消 息, 并建立用户终端的 S1链路标识与核心网节点标识的对应关系, 该核心网节点标识对应的核心网节点是所述用户终端连接的核心网 节点 'ι
路径倒换请求处理模块 902, 用于在接收到目标节点发送的路径 倒换请求消息后, 根据路径倒换请求消息中携带的源 S1链路标识以 及切换请求处理模块 901建立的对应关系, 确定与该源 S1链路标识 对应的核心网节点标识,并向与该核心网节点标识对应的核心网节点 转发路径倒换请求消息。
该基站设备还可包括存储模块, 如数据库 903 , 用于存储切换请 求处理模块 901建立的对应关系信息。
以下针对不同切换场景, 对该基站的各功能模块进行进一步描 述。
针对基站 >该基站下的中继节点的切换场景, 上述基站中, 切 换请求处理模块 901 , 还可用于在发送切换请求消息之前, 判断该用 户终端连接的核心网节点为该用户终端所分配的 S1链路标识是否在 该基站范围内唯一, 如果是, 则将该 S1链路标识携带于切换请求消 息; 否则, 为该用户终端分配在该基站范围内唯一的 S1链路标识, 并将分配的 S1链路标识携带于切换请求消息; 以及,
若所述用户终端连接的核心网节点为该用户终端所分配的 S1链 路标识在该基站范围内唯一, 则建立所述核心网节点分配的 S1链路 标识与该核心网节点标识的对应关系;
若所述用户终端连接的核心网节点为该用户终端所分配的 S1链 路标识在该基站范围内不唯一,且切换请求处理模块 901为该用户终 端分配了 S1 链路标识, 则建立核心网节点为该用户终端分配的 S1 链路标识、切换请求处理模块 901为该用户终端分配的 S1链路标识, 以及该核心网节点标识的对应关系。
路径倒换请求处理模块 902, 还可用于在切换请求处理模块 901 发送切换请求消息之前, 为所述用户终端分配了 S1链路标识且将其 携带于切换请求消息时, 根据切换请求处理模块 901 建立的对应关 系,将路径倒换请求消息中携带的切换请求处理模块 901为该用户终 端分配的源 S1 链路标识替换为核心网节点为该用户终端分配的 S1 链路标识。
针对基站 〉该基站下的中继节点的切换场景(方式一), 上述基 站中, 切换请求处理模块 901 , 还可用于在发送切换请求消息之前, 为所述用户终端分配在该基站范围内唯一的 S1链路标识, 并将其携 带于切换请求消息; 切换请求处理模块 901建立的对应关系包括: 核 心网节点为该用户终端分配的 S1链路标识、 切换请求处理模块 901 为该用户终端分配的 S 1链路标识, 以及该核心网节点标识的对应关 系。
路径倒换请求处理模块 902, 还可用于在接收到路径倒换请求消 息后, 根据切换请求处理模块 901建立的所述对应关系, 将接收到的 路径倒换请求消息中携带的切换请求处理模块 901 为所述用户终端 分配的源 S1 链路标识替换为核心网节点为所述用户终端分配的 S1 链路标识。
针对基站 〉该基站下的中继节点的切换场景(方式二), 上述基 站中,切换请求处理模块 901 ,还可用于在接收到切换请求消息之后, 为用户终端分配该基站范围内唯一的 S 1链路标识, 并用其替换所述 切换请求消息中携带的该基站在所述用户终端附着时为该用户终端 分配的 S1链路标识;切换请求处理模块 901所建立的对应关系包括: 核心网节点为该用户终端分配的 S1链路标识、 所述切换请求处理模 块为该用户终端分配的 S1链路标识, 以及该核心网节点标识的对应 关系; 路径倒换请求处理模块 902, 还可用于在接收到路径倒换请求 消息后, 根据切换请求处理模块 901建立的所述对应关系, 将接收到 的路径倒换请求消息中携带的源 S1链路标识替换为核心网节点为所 述用户终端分配的 S1链路标识,该源 S1链路标识为该基站为所述用 户终端分配的 S1链路标识。
针对同一基站下的不同中继节点之间进行切换的场景(方式一 ), 上述基站中, 切换请求处理模块 901 , 还可用于在转发切换请求消息 之前, 获取切换请求消息中携带的该基站为所述用户终端分配的 S1 链路标识; 切换请求处理模 901块所建立的对应关系包括: 获取到的 该基站为所述用户终端分配的 S1链路标识、 核心网节点在所述用户 终端连接时为其分配的 S1链路标识, 以及所述核心网节点标识的对 应关系; 路径倒换请求处理模块 902, 还可用于在接收到路径倒换请 求消息后, 根据切换请求处理模块 901建立的所述对应关系, 将接收 到的路径倒换请求消息中携带的源 S1链路标识替换为核心网节点为 所述用户终端分配的 S1链路标识,该源 S1链路标识为该基站为所述 用户终端分配的 S1链路标识。
针对同一基站下的不同中继节点之间进行切换的场景(方式二 ), 上述基站中, 切换请求处理模块 901 , 还可用于在转发切换请求消息 之前, 为所述用户终端分配该基站内唯一的 S1链路标识并且携带在 切换请求消息中; 切换请求处理模 901块所建立的对应关系包括: 该 基站为所述用户终端重新分配的 S1链路标识、 核心网节点在所述用 户终端连接时为其分配的 S 1链路标识, 以及所述核心网节点标识的 对应关系; 路径倒换请求处理模块 902, 还可用于在接收到路径倒换 请求消息后, 根据切换请求处理模块 901建立的所述对应关系, 将接 收到的路径倒换请求消息中携带的源 S1链路标识替换为核心网节点 为所述用户终端分配的 S1链路标识,该源 S1链路标识为该基站为所 述用户终端分配的 S1链路标识。
针对基站 >其他基站下的中继节点的切换场景, 上述基站中, 切换请求处理模块 901 , 还可用于在转发切换请求消息之前, 为所述 用户终端分配 S1链路标识, 并用其替换该切换请求消息中携带的核 心网节点为所述用户终端分配的 S1链路标识, 从该切换请求消息中 获取携带的所述用户终端连接的核心网节点的标识;切换请求处理模 块 901 所建立的对应关系包括: 核心网节点为所述用户终端分配的 S1链路标识、切换请求处理模块 901为所述用户终端分配的 S1链路 标识,以及从所述切换请求消息中获取到的核心网节点标识的对应关 系。路径倒换请求模块 902,还可用于在接收到路径倒换请求消息后, 根据切换请求处理模块建立的所述对应关系 ,将该路径倒换请求消息 中携带源 S1 链路标识替换为核心网节点为所述用户终端分配的 S1 链路标识,该源 S 1链路标识为该基站为该用户终端分配的 S 1链路标 识。
针对归属于不同基站的中继节点间进行切换的场景, 上述基站 中,切换请求处理模块 901 ,还可用于在转发所述切换请求消息之前, 将该切换请求消息中携带的该基站在所述用户终端附着时分配的 S1 链路标识替换为核心网节点为所述用户终端分配的 S1链路标识, 在 该切换请求消息中添加所述用户终端连接的核心网节点的标识; 以 及, 在接收到其他基站转发的切换请求消息后, 为所述用户终端分配 在该基站范围内唯一的 S1链路标识,用分配的 S1链路标识替换所述 切换请求消息中携带的核心网节点为所述用户终端分配的 S1链路标 识; 切换请处理模块 901所建立的对应关系包括: 目标中继节点所属 的基站建立的所述对应关系包括:核心网节点为所述用户终端分配的
S1链路标识、切换请求处理模块 901为所述用户终端分配的 S1链路 标识,以及从所述切换请求消息中获取到的核心网节点标识的对应关 系。路径倒换请求处理模块,还可用于在接收到路径倒换请求消息后, 根据切换请求处理模块 901建立的所述对应关系,将该路径倒换请求 消息中携带的源 S1链路标识替换为核心网节点为所述用户终端分配 的 S1链路标识,所述源 S1链路标识为所述切换请求处理模块为所述 用户终端分配的 S1链路标识。
通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可借助软件加必需的通用硬件平台的方式来实现, 当然也可 以通过硬件,但很多情况下前者是更佳的实施方式。基于这样的理解, 软件产品的形式体现出来, 该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服 务器, 或者网络设备等)执行本发明各个实施例所述的方法。
本领域技术人员可以理解附图只是一个优选实施例的示意图,附 图中的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实 施例描述进行分布于实施例的装置中,也可以进行相应变化位于不同 于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个 模块, 也可以进一步拆分成多个子模块。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。 以上公开的仅为本发明的几个具体实施例, 但是, 本发明并非局 限于此,任何本领域的技术人员能思之的变化都应落入本发明的保护 范围。

Claims

权利要求
1、 一种切换过程中寻址核心网节点的方法, 应用于用户终端从 源节点切换到目标节点的过程,且目标节点是中继节点,其特征在于, 包括:
目标中继节点归属的基站向目标中继节点发送或转发切换请求 消息, 建立用户终端的 S1链路标识与核心网节点标识的对应关系, 所述核心网节点标识对应的核心网节点是所述用户终端连接的核心 网节点;
所述基站在接收到目标中继节点发送的路径倒换请求消息后,根 据所述路径倒换请求消息中携带的源 S1链路标识, 以及该基站建立 的所述对应关系, 确定与该源 S 1链路标识对应的核心网节点标识, 并向与该核心网节点标识对应的核心网节点转发路径倒换请求消息。
2、 如权利要求 1所述的方法, 其特征在于, 所述源节点为基站, 所述目标节点为归属于该基站的中继节点;
基站发送切换请求消息之前, 还包括: 判断所述用户终端连接的 核心网节点为该用户终端所分配的 S1链路标识是否在该基站范围内 唯一, 如果是, 则将该 S1链路标识携带于切换请求消息; 否则, 为 该用户终端分配在该基站范围内唯一的 S1链路标识, 并将分配的 S1 链路标识携带于切换请求消息;
若基站判断所述用户终端连接的核心网节点为该用户终端所分 配的 S1链路标识在该基站范围内唯一, 则所述对应关系包括: 所述 核心网节点分配的 S1链路标识与该核心网节点标识的对应关系; 若基站判断所述用户终端连接的核心网节点为该用户终端所分 配的 S1链路标识在该基站范围内不唯一, 且该基站为该用户终端分 配了 S1链路标识, 则所述对应关系包括: 核心网节点为该用户终端 分配的 S1链路标识、该基站为该用户终端分配的 S1链路标识, 以及 该核心网节点标识的对应关系。
3、 如权利要求 2所述的方法, 其特征在于, 基站接收到路径倒 换请求消息后, 还包括:
若所述基站在发送切换请求消息之前为所述用户终端分配了 S1 链路标识且将其携带于切换请求消息,则该基站根据其建立的所述对 应关系,将路径倒换请求消息中携带的该基站为该用户终端分配的源 S1链路标识替换为核心网节点为该用户终端分配的 S1链路标识。
4、 如权利要求 1所述的方法, 其特征在于, 所述源节点为基站, 所述目标节点为归属于该基站的中继节点;
基站发送切换请求消息之前, 还包括: 为所述用户终端分配在该 基站范围内唯一的 S1链路标识, 并将其携带于切换请求消息;
所述对应关系包括: 核心网节点为该用户终端分配的 S1链路标 识、 该基站为该用户终端分配的 S1链路标识, 以及该核心网节点标 识的对应关系。
5、 如权利要求 4所述的方法, 其特征在于, 基站接收到路径倒 换请求消息后, 还包括:
根据所述基站建立的所述对应关系,将接收到的路径倒换请求消 息中携带的该基站为所述用户终端分配的源 S1链路标识替换为核心 网节点为所述用户终端分配的 S1链路标识。
6、 如权利要求 1所述的方法, 其特征在于, 所述源节点和所述 目标节点为归属同一基站的中继节点;
基站转发所述切换请求消息之前, 还包括: 获取所述切换请求消 息中携带的基站为所述用户终端分配的 S1链路标识;
基站建立的所述对应关系包括:从所述切换请求消息中获取到的 基站为所述用户终端分配的 S1链路标识、 核心网节点在所述用户终 端连接时为其分配的 S1链路标识, 以及所述核心网节点标识的对应 关系。
7、 如权利要求 1所述的方法, 其特征在于, 所述源节点和所述 目标节点为归属同一基站的中继节点;
基站接收到所述切换请求消息之后, 还包括: 为所述用户终端分 配该基站范围内唯一的 S 1链路标识, 并用其替换所述切换请求消息 中携带的该基站在所述用户终端附着时为该用户终端分配的 S1链路 标识;
基站建立的所述对应关系包括:核心网节点为该用户终端分配的 S1链路标识、该基站在本次切换中为该用户终端分配的 S1链路标识, 以及该核心网节点标识的对应关系。
8、 如权利要求 6或 7所述的方法, 其特征在于, 基站接收到路 径倒换请求消息后, 还包括:
根据所述基站建立的所述对应关系,将接收到的路径倒换请求消 息中携带的源 S1链路标识替换为核心网节点为所述用户终端分配的 S1链路标识, 该源 S1链路标识为该基站为所述用户终端分配的 S1 链路标识。
9、 如权利要求 1所述的方法, 其特征在于, 所述源节点为基站, 所述目标节点为归属于不同于该基站的中继节点;
源基站将所述用户终端连接的核心网节点的标识携带于切换请 求消息发送;
目标中继节点所属的基站转发切换请求消息之前, 还包括: 为所 述用户终端分配该基站范围内唯一的 S 1链路标识, 并用其替换该切 换请求消息中携带的核心网节点为所述用户终端分配的 S1 链路标 识;
目标中继节点所属的基站建立的所述对应关系包括:核心网节点 为所述用户终端分配的 S1链路标识、 目标中继节点所属的基站为所 述用户终端分配的 S1链路标识, 以及从所述切换请求消息中获取到 的核心网节点标识的对应关系。
10、 如权利要求 9所述的方法, 其特征在于, 目标节点所属的基 站接收到路径倒换请求消息后, 还包括:
目标节点所属的基站根据其建立的所述对应关系,将该路径倒换 请求消息中携带源 S1链路标识替换为核心网节点为所述用户终端分 配的 S1链路标识, 该源 S1链路标识为该基站为该用户终端分配的 SI链路标识。
11、 如权利要求 1所述的方法, 其特征在于, 所述源节点和所述 目标节点为归属于不同基站的中继节点;
目标中继节点所属的基站在转发所述切换请求消息之前, 还包 括:
源中继节点所属的基站接收到源中继节点发送的切换请求消息 后,将该切换请求消息中携带的该基站在所述用户终端附着时分配的
S1链路标识替换为核心网节点为所述用户终端分配的 S1链路标识, 在该切换请求消息中添加所述用户终端连接的核心网节点的标识,并 将该切换请求消息转发给目标中继节点所属的基站;
目标中继节点所属的基站接收到所述切换请求消息之后, 还包 括: 为所述用户终端分配在该基站范围内唯一的 S1链路标识, 用分 配的 S1链路标识替换所述切换请求消息中携带的核心网节点为所述 用户终端分配的 S1链路标识;
目标中继节点所属的基站建立的所述对应关系包括:核心网节点 为所述用户终端分配的 S1链路标识、 该基站在本次切换中为所述用 户终端分配的 S1链路标识, 以及从所述切换请求消息中获取到的核 心网节点标识的对应关系。
12、 如权利要求 11所述的方法, 其特征在于, 目标节点所属的 基站接收到路径倒换请求消息后, 还包括:
目标节点所属的基站根据其所建立的所述对应关系,将该路径倒 换请求消息中携带的源 S1链路标识替换为核心网节点为所述用户终 端分配的 S1链路标识,所述源 S1链路标识为该基站在本次切换中为 所述用户终端分配的 S1链路标识。
13、如权利要求 1至 7、 9至 12任一项所述的方法,其特征在于, 所述对应关系中的 S1链路标识和所述源 S1链路标识,是基站或核心 网节点为所述用户终端分配的在该基站范围内唯一的 S1链路标识。
14、如权利要求 1至 7、 9至 12任一项所述的方法,其特征在于, 所述核心网节点为移动性管理实体 MME, 所述 S1链路标识为 MME UE S1AP ID, 所述核心网节点标识为 GUMMEI。
15、 一种基站, 其特征在于, 包括:
切换请求处理模块,用于向目标中继节点发送或转发切换请求消 息, 并建立用户终端的 S1链路标识与核心网节点标识的对应关系, 所述核心网节点标识对应的核心网节点是所述用户终端连接的核心 网节点;
路径倒换请求处理模块,用于在接收到目标中继节点发送的路径 倒换请求消息后, 根据所述路径倒换请求消息中携带的源 S1链路标 识以及所述切换请求处理模块建立的所述对应关系, 确定与该源 S1 链路标识对应的核心网节点标识,并向与该核心网节点标识对应的核 心网节点转发路径倒换请求消息。
16、 如权利要求 15所述的基站, 其特征在于,
所述切换请求处理模块, 还用于在发送切换请求消息之前, 判断 所述用户终端连接的核心网节点为该用户终端所分配的 S1链路标识 是否在该基站范围内唯一, 如果是, 则将该 S1链路标识携带于切换 请求消息; 否则, 为该用户终端分配在该基站范围内唯一的 S1链路 标识, 并将分配的 S1链路标识携带于切换请求消息; 以及,
若所述用户终端连接的核心网节点为该用户终端所分配的 S1链 路标识在该基站范围内唯一, 则建立所述核心网节点分配的 S1链路 标识与该核心网节点标识的对应关系;
若所述用户终端连接的核心网节点为该用户终端所分配的 S1链 路标识在该基站范围内不唯一,且所述切换请求处理模块为该用户终 端分配了该基站范围内唯一的 S1链路标识, 则建立核心网节点为该 用户终端分配的 S1链路标识、 所述切换请求处理模块为该用户终端 分配的 S 1链路标识, 以及该核心网节点标识的对应关系。
17、 如权利要求 16所述的基站, 其特征在于,
所述路径倒换请求处理模块,还用于根据所述切换请求处理模块 建立的所述对应关系,将路径倒换请求消息中携带的所述切换请求处 理模块为该用户终端分配的源 S1链路标识替换为核心网节点为该用 户终端分配的 SI链路标识。
18、 如权利要求 15所述的基站, 其特征在于,
所述切换请求处理模块, 还用于在发送切换请求消息之前, 为所 述用户终端分配在该基站范围内唯一的 S 1链路标识, 并将其携带于 切换请求消息;
所述切换请求处理模块建立的对应关系包括:核心网节点为该用 户终端分配的 S1链路标识、 所述切换请求处理模块为该用户终端分 配的 S 1链路标识, 以及该核心网节点标识的对应关系。
19、 如权利要求 18所述的基站, 其特征在于,
所述路径倒换请求处理模块,还用于在接收到路径倒换请求消息 后, 根据所述切换请求处理模块建立的所述对应关系, 将接收到的路 径倒换请求消息中携带的所述切换请求处理模块为所述用户终端分 配的源 S1链路标识替换为核心网节点为所述用户终端分配的 S1链路 标识。
20、 如权利要求 15所述的基站, 其特征在于,
所述切换请求处理模块, 还用于在转发所述切换请求消息之前, 获取所述切换请求消息中携带的该基站为所述用户终端分配的 S1链 路标识;
所述切换请求处理模块所建立的对应关系包括:获取到的该基站 为所述用户终端分配的 S1链路标识、 核心网节点在所述用户终端连 接时为其分配的 S1链路标识,以及所述核心网节点标识的对应关系。
21、 如权利要求 15所述的基站, 其特征在于,
所述切换请求处理模块, 还用于在接收到所述切换请求消息之 后, 为所述用户终端分配该基站范围内唯一的 S1链路标识, 并用其 替换所述切换请求消息中携带的该基站在所述用户终端附着时为该 用户终端分配的 S1链路标识;
所述切换请求处理模块所建立的对应关系包括:核心网节点为该 用户终端分配的 S1链路标识、 所述切换请求处理模块为该用户终端 分配的 S 1链路标识, 以及该核心网节点标识的对应关系。
22、 如权利要求 20或 21所述的基站, 其特征在于,
所述路径倒换请求处理模块,还用于在接收到路径倒换请求消息 后, 根据所述切换请求处理模块建立的所述对应关系, 将接收到的路 径倒换请求消息中携带的源 S1链路标识替换为核心网节点为所述用 户终端分配的 S1链路标识,该源 S1链路标识为该基站为所述用户终 端分配的 S1链路标识。
23、 如权利要求 15所述的基站, 其特征在于,
所述切换请求处理模块, 还用于在转发切换请求消息之前, 为所 述用户终端分配该基站范围内唯一的 S 1链路标识, 并用其替换该切 换请求消息中携带的核心网节点为所述用户终端分配的 S1 链路标 识,从该切换请求消息中获取携带的所述用户终端连接的核心网节点 的标识;
所述切换请求处理模块所建立的对应关系包括:核心网节点为所 述用户终端分配的 S1链路标识、 所述切换请求处理模块为所述用户 终端分配的 S1链路标识, 以及从所述切换请求消息中获取到的核心 网节点标识的对应关系。
24、 如权利要求 23所述的方法, 其特征在于,
所述路径倒换请求处理模块,还用于在接收到路径倒换请求消息 后, 根据所述切换请求处理模块建立的所述对应关系, 将该路径倒换 请求消息中携带源 S1链路标识替换为核心网节点为所述用户终端分 配的 S1链路标识, 该源 S1链路标识为该基站为该用户终端分配的 S1链路标识。
25、 如权利要求 15所述的基站, 其特征在于,
所述切换请求处理模块, 还用于在转发所述切换请求消息之前, 将该切换请求消息中携带的该基站在所述用户终端附着时分配的 S1 链路标识替换为核心网节点为所述用户终端分配的 S1链路标识, 在 该切换请求消息中添加所述用户终端连接的核心网节点的标识; 以 及, 在接收到其他基站转发的切换请求消息后, 为所述用户终端分配 在该基站范围内唯一的 S1链路标识,用分配的 S1链路标识替换所述 切换请求消息中携带的核心网节点为所述用户终端分配的 S1链路标 识;
所述切换请求处理模块所建立的对应关系包括:核心网节点为所 述用户终端分配的 S1链路标识、 所述切换请求处理模块为所述用户 终端分配的 S1链路标识, 以及从所述切换请求消息中获取到的核心 网节点标识的对应关系。
26、 如权利要求 25所述的基站, 其特征在于,
所述路径倒换请求处理模块,还用于在接收到路径倒换请求消息 后, 根据所述切换请求处理模块建立的所述对应关系, 将该路径倒换 请求消息中携带的源 S 1链路标识替换为核心网节点为所述用户终端 分配的 S1链路标识,所述源 S1链路标识为所述切换请求处理模块为 所述用户终端分配的 S1链路标识。
PCT/CN2011/072495 2010-04-07 2011-04-07 一种切换过程中寻址核心网节点的方法及其装置 Ceased WO2011124135A1 (zh)

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