WO2012155657A1 - 一种ue切换到混合小区的方法、系统及基站 - Google Patents

一种ue切换到混合小区的方法、系统及基站 Download PDF

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Publication number
WO2012155657A1
WO2012155657A1 PCT/CN2012/072734 CN2012072734W WO2012155657A1 WO 2012155657 A1 WO2012155657 A1 WO 2012155657A1 CN 2012072734 W CN2012072734 W CN 2012072734W WO 2012155657 A1 WO2012155657 A1 WO 2012155657A1
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WIPO (PCT)
Prior art keywords
base station
target
mme
identity
cell
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PCT/CN2012/072734
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English (en)
French (fr)
Inventor
黄莹
奚进
陈琳
谢峰
祝建建
翟恒星
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ZTE Corp
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ZTE Corp
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Classifications

    • 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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method, system, and base station for a user terminal (UE) to switch to a hybrid cell.
  • UE user terminal
  • the home base station is a small, low-power base station that is mainly used in small-scale indoor rooms such as homes and offices.
  • the home base station is connected to the mobile operator core network through a cable access device such as an indoor cable, DSL or optical fiber to provide an access service based on the wireless mobile communication network for a specific user. It is an effective supplement to the existing network deployment. It can effectively improve indoor voice and high-speed data service coverage. It has many advantages, such as low cost, low power, simple access, plug and play, saving backhaul, and compatibility with existing terminals. , improve network coverage, etc.
  • HeNB Long Term Evolution
  • EPC Evolved Packet Core
  • HeNB gateway Home eNB Gateway
  • Mobility Management Entity referred to as MME
  • MME Mobility Management Entity
  • each CSG has a unique identifier, the CSG ID.
  • CSG cell corresponding to closed mode
  • hybrid cell corresponding to the hybrid mode HeNB, any terminal can access, but the UE registered as a member of the CSG group can access the member with higher priority
  • Open cell corresponding to the open mode HeNB, any UE can access.
  • the access mode and CSG ID of the HeNB are broadcast on the air interface.
  • the cell does not broadcast the CSG ID and the access mode, it is an open cell; if the cell broadcasts only the CSG ID, it is a CSG cell; if the cell broadcasts the CSG ID and the access mode with the value of "hybrid", it is a hybrid Community.
  • the core network and the UE respectively save a list of CSG IDs that the user can access as a member.
  • the handover of the UE to the HeNB in the connected state can be completed through the S1 or X2 handover procedure. Since the Mobility Management Entity (MME) is required for access control, in general, switching to the HeNB can only adopt the S1 handover procedure. In comparison, the X2 handover process does not require core network participation, and the handover process is more concise and efficient. In the existing standard protocol, only a small number of MMEs are not required to perform access control, and the basic conditions of the X2 handover (the X2 interface between the source and destination base stations are connected, and both are connected to the same MME pool) can be used.
  • the X2 handover procedure that is, two CSG/hybrid inter-cell handovers having the same CSG ID, or the target cell is an open cell.
  • a typical application scenario of the HeNB that introduces the hybrid mode is that the coverage of the shopping mall is enhanced.
  • the clerk as a member of the CSG group, can enjoy lower rates and higher access priority levels, which can be achieved through admission control at the base station.
  • Admission control as an important function of radio resource management allows or denies new radio bearer setup requests. It takes into account all resource conditions of E-UTRAN, QoS requirements, priority levels, QoS of the provided sessions, and QoS requirements for new requests to achieve higher resource utilization.
  • the HeNB as an indoor coverage enhancement should allow all non-CSG group members to access, but since this part of the user has strong mobility, and the number of weeks and holidays is large, therefore, if for the handover
  • Each user in the hybrid cell adopts the S1 handover procedure, and the MME performs access control, and the signaling load of the core network is relatively large, and has a large Switching delay.
  • the main object of the present invention is to provide a method, system, and base station for a UE to handover to a hybrid cell, which can reduce the signaling load of the core network, simplify the handover process, and reduce the handover delay.
  • a method for a user equipment UE to switch to a hybrid cell including:
  • the source base station sends an X2 handover request message to the target base station to which the target cell belongs, where the target cell is a hybrid cell;
  • the target base station performs admission control on the UE, and if the admission control is successful, sends a path transfer request message to the mobility management entity MME;
  • the MME determines the identity of the UE under the target cell, and indicates the judgment result to the target base station;
  • the target base station performs corresponding processing according to the judgment result of the MME.
  • the method further includes:
  • the source base station determines a target cell to be handed over according to the measurement report sent by the UE, where the source base station and the target base station satisfy the basic condition of the X2 handover;
  • the source base station and the target base station are both home base stations, and the source cell and the target cell have the same CSG ID, and the source base station initiates an X2 handover according to a standard procedure; the source base station is a macro base station, or the source cell is an open cell, or the source cell and the target If the CSG IDs of the cells are different, the source base station sends an X2 handover request message to the target base station.
  • the target base station performs admission control on the UE as:
  • the target base station performs admission control on the UE according to a standard procedure; otherwise, the target base station The default UE identity performs admission control on the UE, and the default UE identity is non-member.
  • the target base station sends a path transfer request message to the mobility management entity MME: after receiving the RRC connection reconfiguration complete message from the UE, the target base station sends a path transfer request message to the MME.
  • the method further includes: after accepting the X2 handover request, the target base station sends a handover request acknowledgement message to the source base station; if the X2 handover request is not accepted, the target base station sends the handover Prepare a failure message to the source base station.
  • the path transfer request message includes a CSG ID and an access mode of the target cell
  • the MME determines that the identity of the UE in the target cell is: a CSG ID and an access mode included in the path transfer request message by the MME.
  • the user subscription information determines whether the identity of the UE in the target cell is a member or a non-member
  • the CSG ID determines that the UE identity is a member in the user subscription information; and the CSG ID does not determine the UE in the user subscription information.
  • the identity is non-member.
  • the MME indicates the judgment result to the target base station as:
  • the MME sends the judgment result to the target base station through the path transfer request acknowledgement message, or sends the judgment result to the target base station through other existing or new messages.
  • the target base station performs corresponding processing according to the judgment result of the MME as:
  • the MME determines that the UE identity is a member, and the target base station sends an E-RAB setup indication to the MME, and the MME initiates an E-RAB setup process.
  • the X2 handover request message sent by the source base station to the target base station carries the identity information reported by the UE in the target cell
  • the target base station performs admission control on the UE to perform admission control based on identity information reported by the UE in the target cell.
  • the target base station performs admission control on the UE as:
  • the admission control priority when the identity in the target cell is a member is higher than the admission control priority when the identity reported by the UE in the target cell is a non-member.
  • the target base station performs corresponding processing according to the judgment result of the MME as:
  • the identity reported by the UE is a member, and the MME determines that the UE identity is a non-member, the target base station sends an E-RAB release indication to the MME, and the MME initiates an E-RAB release process; the identity reported by the UE is a non-member, and the MME If the judgment result indicates that the UE identity is a member, the target base station sends an E-RAB establishment indication to the MME, and the MME initiates an E-RAB establishment process.
  • the method further includes: determining a load condition of the target base station, and if the target base station load meets the preset condition, continuing to perform the subsequent process.
  • a system in which a UE switches to a hybrid cell including a source base station, a target base station, and an MME;
  • the source base station is configured to send an X2 handover request message to a target base station to which the target cell belongs, where the target cell is a hybrid cell;
  • the target base station is configured to perform admission control on the UE after receiving the X2 handover request message from the source base station, and if the admission control is successful, send a path transfer request message to the MME; perform corresponding processing according to the judgment result of the MME ;
  • the MME is configured to determine an identity of the UE under the target cell according to a path transfer request message sent by the target base station, and indicate the determination result to the target base station.
  • the source base station is further configured to: before transmitting the X2 handover request message to the target base station to which the target cell belongs, determine the target cell to be switched according to the measurement report sent by the UE, where the source base station and the target base station satisfy the basic condition of the X2 handover; And the target base station is a home base station, and the CSG IDs of the source cell and the target cell are the same, the source base station initiates an X2 handover according to a standard procedure; the source base station is a macro base station, or the source cell is an open cell, or the source cell and the target cell If the CSG IDs are different, the source base station sends an X2 handover request message to the target base station.
  • the target base station performs admission control on the UE as:
  • the target base station performs admission control on the UE according to a standard procedure; otherwise, the target base station performs the UE on the default UE identity. Admission control, the default UE identity is non-member.
  • the target base station sends a path transfer request message to the mobility management entity MME: after receiving the RRC connection reconfiguration complete message from the UE, the target base station sends a path transfer request message to the MME.
  • the target base station is further configured to: after receiving the X2 handover request, send a handover request acknowledgement message to the source base station, and when not accepting the X2 handover request, send a handover preparation failure message to the source base station.
  • the MME determines that the identity of the UE in the target cell is: the MME determines whether the identity of the UE in the target cell is a member or a non-member according to the CSG ID, the access mode, and the user subscription information included in the path transfer request message.
  • the CSG ID determines that the UE identity is a member in the user subscription information; and the CSG ID is not in the user subscription information, and determines that the UE identity is a non-member.
  • the MME indicates the judgment result to the target base station as:
  • the MME sends the judgment result to the target base station through the path transfer request acknowledgement message, or sends the judgment result to the target base station through other existing or new messages.
  • the target base station performs corresponding processing according to the judgment result of the MME as:
  • the MME determines that the UE identity is a member, and the target base station sends an E-RAB setup indication to the MME, and the MME initiates an E-RAB setup process.
  • the X2 handover request message sent by the source base station to the target base station carries the identity information reported by the UE in the target cell
  • the target base station performs admission control on the UE to perform admission control based on the identity information reported by the UE in the target cell.
  • the target base station performs the admission control on the UE: the priority of the admission control when the identity of the target cell in the target cell is a member is higher than the identity reported by the UE in the target cell. Admission control priority when non-members.
  • the target base station performs corresponding processing according to the judgment result of the MME as:
  • the identity reported by the UE is a member, and the MME determines that the UE identity is a non-member, the target base station sends an E-RAB release indication to the MME, and the MME initiates an E-RAB release process; the identity reported by the UE is a non-member, and the MME If the judgment result indicates that the UE identity is a member, the target base station sends an E-RAB establishment indication to the MME, and the MME initiates an E-RAB establishment process.
  • the system further includes a target base station load condition determining module, configured to determine a load condition of the target base station, and the target base station load satisfies a preset condition, and then notify the source base station to send an X2 handover request message to the target base station.
  • a target base station load condition determining module configured to determine a load condition of the target base station, and the target base station load satisfies a preset condition, and then notify the source base station to send an X2 handover request message to the target base station.
  • a base station configured to perform admission control on a corresponding UE after receiving an X2 handover request message that the target cell that is sent by another base station is a hybrid cell, and send a path transfer request message to the MME if the admission control is successful; and according to the MME The judgment result is processed accordingly.
  • the base station performs admission control on the UE as:
  • the default UE identity is non-member.
  • the base station performs corresponding processing according to the judgment result of the MME as:
  • the base station sends an E-RAB establishment indication to the MME, and the MME initiates an E-RAB establishment process.
  • the X2 handover request message received by the base station also carries the identity information reported by the UE in the target cell.
  • the performing base station performs the admission control on the UE: performing admission control based on the identity information reported by the UE in the target cell, where the identity reported by the UE in the target cell is The admission control priority of the member is higher than the admission control priority when the identity reported by the UE in the target cell is a non-member.
  • the base station performs corresponding processing according to the judgment result of the MME as:
  • the identity reported by the UE is a member, and the MME determines that the UE identity is a non-member, the base station sends an E-RAB release indication to the MME, and the MME initiates an E-RAB release process; the identity reported by the UE is a non-member, and the MME determines The result indicates that the UE identity is a member, and the base station sends an E-RAB establishment indication to the MME, and the MME initiates an E-RAB establishment process.
  • the method, system and base station for the UE to switch to the hybrid cell the source base station sends an X2 handover request message to the target base station to which the target cell belongs, the target cell is a hybrid cell, and the target base station performs admission control on the UE. And if the admission control is successful, sending a path transfer request message to the mobility management entity MME; the MME determines the identity of the UE under the target cell, and indicates the determination result to the target base station; and the target base station performs corresponding according to the judgment result of the MME. deal with.
  • the core network element can be prevented from performing access control during the handover process, thereby effectively simplifying the handover process and reducing the handover delay.
  • FIG. 1 is a schematic diagram of an E-UTRAN network architecture in which a home base station is deployed;
  • FIG. 2 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of a UE handover to a hybrid cell according to Embodiment 2 of the present invention
  • FIG. 5 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 3 of the present invention
  • FIG. 6 is a schematic flowchart of a method for a UE to handover to a hybrid cell according to Embodiment 4 of the present invention
  • FIG. 8 is a schematic flowchart of a method for a UE to handover to a hybrid cell according to Embodiment 6 of the present invention.
  • the source base station sends an X2 handover request message to the target base station to which the target cell belongs, where the target cell is a hybrid cell; the target base station performs admission control on the UE, and if the admission control is successful, sends a path transfer request message to the mobility management entity MME; The MME determines the identity of the UE under the target cell, and indicates the determination result to the target base station; the target base station performs corresponding processing according to the judgment result of the MME.
  • FIG. 1 is a schematic diagram of an E-UTRAN network architecture in which a home base station is deployed.
  • the HeNB can connect to the MME through the HeNB GW as an SI proxy. If the HeNB connects to the MME through the HeNB GW as an SI proxy, the HeNB GW relays the UE.
  • Related SI signaling There is an X2 direct interface between the HeNBs, and the X2 direct interface can be used for handover optimization. In the current standard, the X2 direct interface between the macro base station and the home base station is not supported at present, but for the subsequent version of LTE, it is reasonable and necessary to support the X2 direct interface between the macro base station and the home base station, as shown in FIG. The X2 interface between the eNB 3 and the HeNB 1.
  • the embodiment of the present invention is applicable to the handover to the hybrid cell scenario, and specifically includes the following three types: 1) the source cell is an open cell, or the source cell is a hybrid cell or a CSG cell, and the CSG IDs of the source cell and the target cell are different;
  • Both the source base station and the target base station are home base stations, and the CSG IDs of the source cell and the target cell are the same;
  • the source base station is a macro base station, and the target cell is a hybrid cell.
  • FIG. 2 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to an embodiment of the present invention. As shown in FIG. 2, the method includes:
  • Step 201 The source base station performs a handover decision after receiving the measurement report of the UE, and selects the target cell to be handed over.
  • the selected target cell is a hybrid mode (that is, a hybrid cell), and the source base station and the target base station are used. Meet the basic conditions of X2 switching.
  • the basic condition of the X2 handover is that the source base station and the target base station are connected in the same MME pool. And there is an X2 interface between the source base station and the target base station.
  • Step 202 It is determined that both the source base station and the target base station are home base stations, and the CSG IDs of the source cell and the target cell are the same, then go to step 203; otherwise, the source base station is a macro base station, or the source cell is an open cell, or a source cell. Different from the CSG ID of the target cell, go to step 204.
  • Step 203 The source base station initiates an X2 handover.
  • the process in which the source base station initiates the X2 handover and the admission control flow of the target base station are performed according to the existing standard procedure.
  • Step 204 The source base station sends an X2 handover request message to the target base station, and the target base station performs admission control on the UE.
  • the target base station performs admission control based on the default UE identity.
  • the default UE identity is a non-member
  • the target base station performs admission control based on the default UE identity, that is, determines whether to accept or reject the handover according to the current idle resource state, the QoS information of the request to establish the E-RAB in the handover request message, and the priority level. request. That is, the target base station uses the default priority level for admission control, and for the hybrid mode base station, the default priority level is based on the non-membership level.
  • the X2 handover request message sent by the source base station to the target base station carries the identity information reported by the UE in the target cell, and the target base station performs admission control based on the identity information reported by the UE in the target cell.
  • the priority of the admission control when the identity of the target cell in the target cell is a member is higher than the priority of the admission control when the identity of the target cell is a non-member.
  • the method further includes:
  • a handover request acknowledgement message is sent to the source (H) eNB;
  • Step 205 The target base station sends a path transfer request message to the MME after receiving the RRC connection reconfiguration complete message.
  • the message includes the CSG ID of the target cell and the access mode (in the embodiment of the present invention, the value is hybrid).
  • Step 206 After receiving the path transfer request message sent by the target base station, the MME determines the identity of the UE under the target cell, and indicates the determination result to the target base station.
  • the MME determines whether the identity of the UE in the hybrid mode target cell is a member or a non-member according to the CSG ID, the access mode, and the user subscription information included in the path transfer request message, and if the CSG ID is in the user subscription information, the UE is determined.
  • the identity is a member, and if the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member.
  • the MME may send the UE identity to the target base station through a path transfer request acknowledgement message, or may send the UE identity to the target HeNB through other existing or new messages.
  • Step 207 The target base station performs corresponding processing according to the judgment result of the MME.
  • the target base station performs admission control on the UE with the default UE identity
  • the MME determines that the UE identity is a member
  • the target base station sends an E-RAB setup indication to the MME, and the MME initiates an E-RAB setup process.
  • the target base station performs the admission control based on the identity information reported by the UE in the target cell, if the identity reported by the UE is a member, and the judgment result of the MME indicates that the UE identity is a non-member, the target base station sends the E-RAB release. Instructing the MME, the MME initiates an E-RAB release process; if the identity reported by the UE is a non-member, and the MME determines that the UE identity is a member, the target base station sends an E-RAB setup indication to the MME, and the MME initiates the E-RAB establishment. process.
  • the target base station may update the identity information of the UE according to the judgment result of the MME, and adjust the priority level of the UE for subsequent admission control.
  • the load of the target base station may be further considered, that is, before the step 204 is performed, the HeNB load condition is determined. If the target HeNB load is high, the S1 or X2 switch is initiated according to the existing standard procedure; otherwise, The target base station load meets a preset condition, and the X2 handover is initiated according to the method in the embodiment of the present invention.
  • the embodiment of the present invention further provides a system for a UE to switch to a hybrid cell, where the system package Included: a source base station, a target base station, and an MME;
  • the source base station is configured to: after selecting a target cell for the UE, send an X2 handover request message to the target base station, where the target cell is a hybrid cell;
  • the target base station is configured to: after receiving the X2 handover request message from the source base station, perform admission control on the UE, and accept the X2 handover request, send a path transfer request message to the MME;
  • the MME is configured to determine an identity of the UE under the target cell according to a path transfer request message sent by the target base station, and indicate the determination result to the target base station.
  • the source base station After the source base station selects the target cell for the UE, the source base station sends an X2 handover request message to the target base station as follows:
  • the source base station determines a target cell to be handed over according to the measurement report sent by the UE, where the source base station and the target base station satisfy the basic condition of the X2 handover;
  • the source base station and the target base station are both home base stations, and the source cell and the target cell have the same CSG ID, and the source base station initiates an X2 handover according to a standard procedure; the source base station is a macro base station, or the source cell is an open cell, or the source cell and the target If the CSG IDs of the cells are different, the source base station sends an X2 handover request message to the target base station.
  • the target base station performs admission control on the UE as:
  • the target base station performs admission control on the UE according to a standard procedure; otherwise, the target base station performs the UE on the default UE identity. Admission control, the default UE identity is non-member.
  • the target base station is further configured to: after receiving the X2 handover request, send a handover request acknowledgement message to the source base station, and when not accepting the X2 handover request, send a handover preparation failure message to the source base station.
  • the MME determines that the identity of the UE in the target cell is: the MME determines that the UE is in the target according to the CSG ID, the access mode, and the user subscription information included in the path transfer request message.
  • the identity of the UE is a member or a non-member.
  • the CSG ID determines that the UE identity is a member in the user subscription information. If the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member.
  • the MME indicates the judgment result to the target base station as:
  • the MME sends the judgment result to the target base station through the path transfer request acknowledgement message, or sends the judgment result to the target base station through other existing or new messages.
  • the target base station performs corresponding processing according to the judgment result of the MME as:
  • the MME determines that the UE identity is a member, and the target base station sends an E-RAB setup indication to the MME, and the MME initiates an E-RAB setup process.
  • the X2 handover request message sent by the source base station to the target base station carries the identity information reported by the UE in the target cell
  • the target base station performs admission control on the UE to perform admission control based on identity information reported by the UE in the target cell.
  • the target base station performs the admission control on the UE: the priority of the admission control when the identity of the target cell in the target cell is a member is higher than the identity reported by the UE in the target cell. Admission control priority when non-members.
  • the target base station performs corresponding processing according to the judgment result of the MME as:
  • the identity reported by the UE is a member, and the MME determines that the UE identity is a non-member, the target base station sends an E-RAB release indication to the MME, and the MME initiates an E-RAB release process; the identity reported by the UE is a non-member, and the MME If the judgment result indicates that the UE identity is a member, the target base station sends an E-RAB establishment indication to the MME, and the MME initiates an E-RAB establishment process.
  • the system further includes a target base station load condition determining module, configured to determine a load condition of the target base station, and the target base station load satisfies a preset condition, and then notify the source base station to send an X2 handover request message to the target base station.
  • a target base station load condition determining module configured to determine a load condition of the target base station, and the target base station load satisfies a preset condition, and then notify the source base station to send an X2 handover request message to the target base station.
  • the embodiment of the invention also correspondingly discloses a base station, which is set to receive other bases.
  • the admission control is performed on the corresponding UE. If the admission control is successful, the path transfer request message is sent to the MME; and corresponding processing is performed according to the judgment result of the MME.
  • the base station performs admission control on the UE as:
  • the default UE identity is non-member.
  • the base station performs corresponding processing according to the judgment result of the MME as:
  • the MME determines that the UE identity is a member, and the base station sends an E-RAB setup indication to the MME, and the MME initiates an E-RAB setup process.
  • the X2 handover request message received by the base station also carries the identity information reported by the UE in the target cell.
  • the base station performs the admission control on the UE: performing admission control based on the identity information reported by the UE in the target cell, and the admission control priority when the identity reported by the UE in the target cell is a member
  • the admission control priority is higher when the identity reported by the UE in the target cell is a non-member.
  • the base station performs corresponding processing according to the judgment result of the MME as:
  • the identity reported by the UE is a member, and the MME determines that the UE identity is a non-member, the base station sends an E-RAB release indication to the MME, and the MME initiates an E-RAB release process; the identity reported by the UE is a non-member, and the MME determines The result indicates that the UE identity is a member, and the base station sends an E-RAB establishment indication to the MME, and the MME initiates an E-RAB establishment process.
  • FIG. 3 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 1 of the present invention.
  • the method includes: Step 301: A UE sends a measurement report to a source (H) eNB.
  • the measurement report includes at least a physical cell identifier PCI (Physical Cell ID) of the target base station.
  • PCI Physical Cell ID
  • Step 302 The source (H) eNB (possibly a macro station or a home base station) selects a handover target base station according to the measurement report, and can determine the type of the handover target base station according to the PCI.
  • H source
  • eNB possibly a macro station or a home base station
  • Step 303 If the target base station is a hybrid mode home base station, and the X2 handover basic condition is met (the X2 interface between the source and destination base stations is connected to the same MME pool), and the source and target cell CSG IDs are different, then The X2 handover request message is sent to the target HeNB.
  • Step 304 After receiving the X2 handover request message, the target HeNB performs admission control according to the current idle resource status, the Qos information and the priority level of the E-RAB requesting to be established in the handover request message, that is, accepting or rejecting the handover request.
  • the target HeNB here uses the default priority level for admission control, and for the hybrid mode, the HeNB default priority level is based on the non-membership level.
  • Step 305 If the target HeNB accepts at least one non-GBR E-RAB, the target HeNB reserves related resources for the UE and sends an X2 handover request acknowledgement message to the source (H) eNB.
  • the message includes an RRC message indicating that the UE performs handover, that is, an RRC connection reconfiguration message. No, 'J, send a handover preparation failure message to the source (H) eNB, and terminate the flow.
  • the message also includes an E-RAB list accepted by the target HeNB and an E-RAB list not accepted by the target HeNB.
  • Step 306 The source (H)eNB sends an RRC connection reconfiguration message to the UE through an air interface to indicate that the UE performs a corresponding handover operation.
  • Step 307 If necessary, the source (H) eNB sends a SN status transfer message to the target HeNB to transmit the uplink and downlink PDCP SN status.
  • Step 308 After successfully accessing the target HeNB, the UE sends an RRC connection reconfiguration complete message to the target (H)eNB.
  • Step 309 The target HeNB sends a path transfer request message to the MME to notify the UE that the cell has been replaced.
  • the message contains the CSG ID of the target HeNB, and the access mode value is , hybrid".
  • Step 310 After receiving the path transfer request message, the MME determines whether the identity of the UE in the hybrid mode target HeNB is a member or a non-member according to the CSG ID ⁇ access mode and the user subscription information included in the message. If the CSG ID is in the user subscription information, it is determined that the UE identity is a member, and if the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member. After the path of the user plane of the at least one E-RAB is successfully transferred, the MME sends a path transfer request acknowledgement message to the target HeNB. The MME indicates the UE identity to the target HeNB through the message.
  • the MME can indicate the UE identity by the following two methods.
  • the first method is to add a "UE identity indication” cell in the path transfer request confirmation message, if the member is a member, the value is "member", and if it is a non-member, the value is "non-member”;
  • the method is to add a "UE identity indication” cell to the path transfer request acknowledgement message. If it is a member, the value is "member”. If it is a non-member, the message is not carried in the message.
  • Step 311 After receiving the path transfer request acknowledgement message, the target HeNB updates the identity of the UE according to the judgment result of the MME and adjusts its priority level for subsequent admission control of the UE.
  • Step 312 The target HeNB sends a user context release message to the source (H) eNB to release the user-related resources on the source (H) eNB.
  • Step 313 If the MME indicates to the target HeNB that the UE is a member user of the target cell, the target HeNB sends an E-RAB setup indication message to the MME, where the message includes the target HeNB in the X2 handover request acknowledgement message in step 305. List of unaccepted E-RABs.
  • Step 314 The MME sends an E-RAB setup message to the target HeNB, where the E-RAB setup list is the E-RAB list included in step 313.
  • Step 315 The target HeNB sends an RRC connection reconfiguration message to the UE to establish an E-RAB.
  • Corresponding DRB data radio bearer
  • Step 316 The UE replies to the RRC connection reconfiguration complete message to the target HeNB after completing the configured DRB establishment.
  • Step 317 The target HeNB replies to the E-RAB setup response message to the MME.
  • Example 2 The target HeNB replies to the E-RAB setup response message to the MME.
  • This embodiment describes a method for the MME to indicate the identity of the UE by using the UE identity indication message in the case that the target HeNB performs the admission control based on the default identity of the UE.
  • the difference between this embodiment and the embodiment 1 is that the MME receives the path transfer request. After the message, the identity of the UE under the hybrid mode target HeNB is determined, and the identity is immediately indicated to the target HeNB.
  • FIG. 4 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 2 of the present invention. As shown in FIG. 4, steps 401-409, 411, and steps 413-418 and steps 301-309 and 311 in the flowchart of Embodiment 1 are shown in FIG. Steps 312-317 are the same, and the description is not repeated here.
  • Step 410 After receiving the path transfer request message, the MME determines whether the identity of the UE in the hybrid mode target HeNB is a member or a non-member according to the CSG ID, the access mode, and the user subscription information included in the message. If the CSG ID is in the user subscription information, it is determined that the UE identity is a member, and if the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member. After the judgment is completed, the MME immediately sends a UE identity indication message to indicate the UE identity to the target HeNB.
  • the MME can indicate the UE identity by the following two methods.
  • the first method is to carry a "UE identity indication” cell in the UE identity indication message, if the member is a member, the value is "member", and if it is a non-member, the value is "non-member”;
  • the UE identity indication message carries the "UE identity indication” cell. If it is a member, the value is "member”. If it is a non-member, the message is not carried in the message.
  • Step 412 The MME exchanges a user plane update request/response message with the Serving-GW. After the path of the user plane of the at least one E-RAB is successfully transferred, the MME sends a path transfer request acknowledgement message to the target HeNB.
  • Example 3 The MME exchanges a user plane update request/response message with the Serving-GW. After the path of the user plane of the at least one E-RAB is successfully transferred, the MME sends a path transfer request acknowledgement message to the target HeNB.
  • FIG. 5 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 3 of the present invention. As shown in FIG. 5, the method includes:
  • Step 501 After receiving the measurement report of the UE, the source base station determines that the target HeNB is in the hybrid mode according to the PCI. And there is an X2 interface between the source and target base stations, and the source and target base stations are connected in the same MME pool.
  • Step 502 If the source base station detects that the target HeNB load is high, the method described in Embodiment 1 or Embodiment 2 is not used, and the S1 or X2 handover is initiated according to the existing standard procedure.
  • Step 503 If the source base station detects that the target HeNB load is not high, then the method described in Embodiment 1 or Embodiment 2 is used to initiate the X2 handover.
  • the source base station may request the target HeNB to reply to the resource status response message by using the resource status request message to obtain the radio resource usage status of the target HeNB.
  • the radio resource usage status of the target HeNB can also be obtained through the resource status update message.
  • Step 504 If the target HeNB has a high load and the source base station is a home base station, and the source and destination cells have the same CSG ID, the X2 handover is initiated according to the existing standard procedure.
  • Step 505 If the target HeNB load is high, and the source base station is the home base station in step 504, and the CSG IDs of the source and the target cells are the same, the S1 handover is initiated according to the existing standard procedure.
  • Example 4 If the target HeNB load is high, and the source base station is the home base station in step 504, and the CSG IDs of the source and the target cells are the same, the S1 handover is initiated according to the existing standard procedure.
  • FIG. 6 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 4 of the present invention. As shown in FIG. 6, the method includes:
  • Step 601 The UE sends a measurement report to the source (H) eNB.
  • the UE reports the member of the target hybrid cell in the measurement report.
  • Step 602 The source (H) eNB (possibly a macro base station or a home base station) selects a handover target base station according to the measurement report, and can determine the type of the handover target base station according to the PCI in the measurement report, and determine whether the basic condition of the X2 handover is met. (The source and destination base stations have X2 interfaces, and both are connected to the same MME pool. If yes, the X2 switch is initiated. If not, the S1 switch is initiated. In this embodiment, it is assumed that the selected handover target base station is in the hybrid mode.
  • Step 603 If the source and target cell CSG IDs are the same, the source cell sends an X2 handover request message to the target cell according to the existing standard protocol procedure. If the source and destination cell CSG IDs are different, or the source base station is a macro base station, the source cell The X2 handover request message is sent to the target cell, where the message carries the identity of the target cell reported by the UE in the measurement report. In this embodiment, the UE reports that it is a member of the target hybrid cell.
  • Step 604 After receiving the X2 handover request message, the target HeNB performs admission control according to the current idle resource status, requesting establishment of E-RAB QoS information and priority level in the handover request message, that is, accepting or rejecting the handover request.
  • the target HeNB performs admission control based on the corresponding priority level of the identity reported by the UE (in this embodiment, the UE is a member of the target cell).
  • Step 605 If the target HeNB accepts at least one non-GBR E-RAB, the target HeNB reserves related resources for the UE and sends an X2 handover request acknowledgement message to the source (H) eNB.
  • the message includes an RRC message indicating that the UE performs handover, that is, an RRC connection reconfiguration message. No, 'J, send a handover preparation failure message to the source (H) eNB, and terminate the flow.
  • Step 606 The source (H)eNB sends an RRC connection reconfiguration message to the UE through an air interface to indicate that the UE performs a corresponding handover operation.
  • Step 607 If necessary, the source (H) eNB sends an SN status transfer message to the target HeNB. To pass the uplink and downlink PDCP SN status.
  • Step 608 After successfully accessing the target HeNB, the UE sends an RRC connection reconfiguration complete message to the target (H)eNB.
  • Step 609 The target HeNB sends a path transfer request message to the MME to notify the UE that the cell has been replaced. Because the target cell is hybrid, the message contains the CSG ID of the target HeNB, and the access mode value is "hybrid".
  • Step 610 After receiving the path transfer request message, the MME determines whether the identity of the UE in the hybrid mode target HeNB is a member or a non-member according to the CSG ID ⁇ access mode and the user subscription information included in the message. If the CSG ID is in the user subscription information, it is determined that the UE identity is a member, and if the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member. After the path of the user plane of the at least one E-RAB is successfully transferred, the MME sends a path transfer request acknowledgement message to the target HeNB, and the message of the target cell determined by the MME is indicated to the target HeNB by the message.
  • the MME can indicate the identity of the UE by the following method.
  • a "UE identity indication” cell may be added in the path transfer request confirmation message, if the member is a member, the value is "member", if it is a non-member, the value is "non-member”; or the path transfer request may be A new "UE identity indication” cell is added to the acknowledgment message. If it is a member, its value is “member”. If it is a non-member, the message is not carried in the message.
  • the MME determines that the UE is a member in the target hybrid cell.
  • Step 611 After receiving the path transfer request acknowledgement message, the target HeNB confirms that the UE is a member in the target hybrid cell, and saves the UE identity for subsequent admission control on the UE.
  • Step 612 The target HeNB sends a user context release message to the source (H) eNB to release the user related resources on the source (H) eNB.
  • Example 5 The target HeNB sends a user context release message to the source (H) eNB to release the user related resources on the source (H) eNB.
  • This embodiment describes that the target HeNB performs the identity based on the UE reported in the target cell.
  • the UE reports as a member, and the MME confirms that the UE is a non-member through a path transfer request acknowledgement message.
  • the difference between the embodiment and the fourth embodiment is that, after receiving the path transfer request message, the MME determines that the UE is a non-member in the target hybrid cell according to the CSG ID, the access mode and the user subscription information, and
  • FIG. 7 is the fifth embodiment of the present invention.
  • Steps 701-709 are the same as steps 601-609 in Embodiment 4, and the description will not be repeated here.
  • Step 710 After receiving the path transfer request message, the MME determines whether the identity of the UE in the hybrid mode target HeNB is a member or a non-member according to the CSG ID, access mode, and user subscription information included in the message. If the CSG ID is in the user subscription information, it is determined that the UE identity is a member, and if the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member. After the judgment is completed, the MME immediately sends a UE identity indication message to indicate the UE identity to the target HeNB.
  • the MME can indicate the UE identity by the following two methods.
  • the first method is to carry a "UE identity indication” cell in the UE identity indication message, if the member is a member, the value is "member", and if it is a non-member, the value is "non-member”;
  • the UE identity indication message carries the "UE identity indication” cell. If it is a member, the value is "member”. If it is a non-member, the message is not carried in the message.
  • the MME determines that the UE is a non-member in the target hybrid cell.
  • Step 711 After receiving the path transfer request acknowledgement message, the target cell obtains the identity of the UE in the target cell determined by the MME. In this embodiment, the MME confirms that the UE is a non-member. Because the UE performs the admission control based on the priority level corresponding to the membership in the step 704, the target cell decides according to its own load situation (how to decide whether to send the specific implementation correlation, For example, if the target cell is heavily loaded, the E-RAB release indication message is sent to send the E-RAB release indication message to the MME, and the message needs to carry the E-RAB list to be released, so as to trigger the MME to initiate the E-RAB release process. .
  • Step 712 The target HeNB sends a user context release message to the source (H)eNB to release. User-related resources on the source (H) eNB. This step is after step 701, but may be before or after step 713, step 714.
  • Step 713 The MME sends an E-RAB release command message to the target HeNB, where the message carries the E-RAB list that needs to be released in the step 711 message, to indicate that the target HeNB releases the relevant E-RAB.
  • Step 714 The target HeNB sends an RRC connection reconfiguration message to the UE to release the air interface resource DRB of the related E-RAB.
  • Step 715 The UE returns an RRC connection reconfiguration complete message to the target HeNB after completing the release of the related DRB.
  • Step 716 The target HeNB confirms release of the relevant E-RAB, and sends an E-RAB release response message to the MME.
  • Example 6 The target HeNB confirms release of the relevant E-RAB, and sends an E-RAB release response message to the MME.
  • the present embodiment describes a method for the MME to indicate the identity of the UE by using the UE identity indication message in the case that the target HeNB performs the admission control in the target cell, and in this embodiment, after receiving the path transfer request message, the MME receives the path transfer request message. After determining the identity of the UE under the hybrid mode target HeNB, the UE identity is immediately indicated to the target HeNB.
  • FIG. 8 is a schematic flowchart of a method for a UE to switch to a hybrid cell according to Embodiment 6 of the present invention. As shown in FIG. 8, the method includes: Steps 801-809 are similar to steps 601-609 in Embodiment 4, and the description is not repeated herein. In step 801, step 803, step 804, the UE identity may be a member or a non-member.
  • Step 810 After receiving the path transfer request message, the MME determines whether the identity of the UE in the hybrid mode target HeNB is a member or a non-member according to the CSG ID, the access mode, and the user subscription information included in the message. If the CSG ID is in the user subscription information, it is determined that the UE identity is a member, and if the CSG ID is not in the user subscription information, the UE identity is determined to be a non-member. After the judgment is completed, the MME immediately sends a UE identity indication message to indicate the UE identity to the target HeNB.
  • the MME can indicate the identity of the UE by the following two methods.
  • the first method is in the identity of the UE
  • the indication message carries the "UE identity indication” cell. If it is a member, its value is “member”. If it is a non-member, its value is "non-member”; the second method is carried in the UE identity indication message.
  • the "UE identity indication” cell if it is a member, its value is “member”. If it is a non-member, the message is not carried in the message.
  • Step 811 If the identity reported by the UE is a member, and the MME determines that the UE identity is a non-member, the target base station sends an E-RAB release indication to the MME, and the MME initiates an E-RAB release process; the identity reported by the UE is a non-member.
  • the MME determines that the UE identity is a member, and the target base station sends an E-RAB setup indication to the MME, and the MME initiates an E-RAB setup process.
  • the E-RAB establishment process and the E-RAB release process are described in Embodiment 1, Embodiment 5.
  • Step 812 The target HeNB sends an E-RAB release response message to the MME if it confirms that the relevant E-RAB is released.
  • Step 813 The MME and the Serving-GW exchange user plane update request/response messages. After the path of the user plane of at least one E-RAB is successfully transferred, the MME sends a path transfer request acknowledgement message to the target HeNB. This step is after step 809, but may be before or after step 811, step 812, step 814.
  • Step 814 The target HeNB sends a user context release message to the source (H) eNB to release the user related resources on the source (H) eNB.
  • the source base station can decide whether to adopt the method described in Embodiment 4, Embodiment 5 or Embodiment 6 according to the load condition of the target base station, that is, the radio resource usage status. In this way, the access success rate of the user who is a member identity can be guaranteed if the target HeNB is heavily loaded.
  • the method and system for the UE to switch to the hybrid cell proposed by the present invention can effectively simplify the handover process and reduce the handover delay.

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Description

一种 UE切换到混合小区的方法、 系统及基站 技术领域
本发明涉及无线通信技术领域， 尤其涉及一种用户终端 （UE )切换到 混合 ( hybrid ) 小区的方法、 系统及基站。 背景技术
家庭基站是一种小型低功率基站， 主要用于家庭和办公室等小范围室 内场所。 家庭基站通过室内的电缆、 DSL或光纤等有线接入设备连接到移 动运营商核心网， 为特定用户提供基于无线移动通信网络的接入业务。 是 对现有网络部署的有效补充， 能有效提高室内语音和高速数据业务覆盖， 具有很多优点， 如低成本、 低功率、 接入简单、 即插即用、 节省回传、 与 现有终端兼容， 提高网络覆盖等。
LTE( Long Term Evolution )系统中家庭基站被称为 HeNB ( home eNB )0 HeNB所支持的功能与 eNB基本一致， HeNB与 EPC ( Evolved Packet Core ) 之间的进程和 eNB与 EPC之间的进程基本一致。由于 HeNB的布署通常没 有经过移动运营商的网络规划、 覆盖范围小且数量众多， 为了更方便的管 理并为了支持更多数量的 HeNB ,在 E-UTRAN ( Evolved UTRAN )架构下， 还可能在 HeNB与 EPC的 S1连接之间引入一个新的网元 HeNB GW(Home eNB Gateway) HeNB可通过 HeNB GW作为 SI代理连接移动管理实体
( Mobility Management Entity, 简称 MME )。 HeNB之间存在 X2直接接口， 可进行负荷均衡、 切换优化、 信息交互等。
由于 HeNB 只为特定用户提供服务， 因此引入了封闭成员组 CSG
( Closed Subscriber Group )概念， 每个 CSG有唯一的标识即 CSG ID。 LTE 中为 HeNB定义了三种不同接入方式的小区： CSG小区 （对应 closed模式 HeNB, 仅注册为 CSG组成员的 UE可以接入；)、 hybrid小区 （对应 hybrid 模式 HeNB, 任意终端都可接入， 但注册为 CSG组成员的 UE能以更高优 先级的成员身份接入；)、 Open小区 （对应 open模式 HeNB, 任意 UE都可 接入）。 HeNB的接入模式和 CSG ID在空口进行广播。若该小区不广播 CSG ID和接入模式，则为 open小区；若该小区只广播 CSG ID,则为 CSG小区； 若该小区广播 CSG ID和值为 "hybrid"的接入模式， 则为 hybrid小区。 核心 网和 UE分别保存用户可以以成员身份接入的 CSG ID列表。
UE在连接态切换到 HeNB可以通过 S1或 X2切换流程完成。 由于需 要移动管理实体（Mobility Management Entity, MME )做接入控制， 一般 情况下， 切换到 HeNB只能采用 S1切换流程。 相比较而言， X2切换流程 不需要核心网参与， 切换流程更加简洁高效。 而现有的标准协议中， 仅在 少数不需要 MME做接入控制， 且满足 X2切换基本条件 (源和目的基站之 间有 X2接口， 且都连接在同一个 MME pool ) 的情况下可以采用 X2切换 流程， 即两个拥有相同 CSG ID的 CSG/hybrid小区间切换， 或目标小区是 open小区。
引入 hybrid模式的 HeNB的典型应用场景是 shopping mall的覆盖增强， 店员作为 CSG组成员可以享有更低的费率和更高的接入优先级别， 后者可 通过位于基站的接纳控制来完成。 接纳控制作为无线资源管理的一个重要 功能允许或拒绝新的无线承载建立请求。其综合考虑 E-UTRAN所有资源情 况、 QoS需求、 优先等级、 己提供会话的 QoS和新请求的 QoS需求以达到 较高的资源利用率。
另一方面， HeNB作为室内覆盖增强应该允许所有的非 CSG组成员用 户都可以接入， 然而由于这部分用户具有很强的流动性， 且周未和节假日 更是数目众多， 因此， 如果对于切换到该 hybrid小区的每个用户都采用 S1 切换流程， 由 MME做接入控制， 核心网的信令负荷比较大， 而且具有较大 的切换延迟。 发明内容
有鉴于此， 本发明的主要目的在于提供一种 UE切换到混合小区的方 法、 系统及基站， 能够减轻核心网的信令负荷、 简化切换流程、 降低切换 延迟。
为达到上述目的， 本发明实施例的技术方案是这样实现的：
一种用户设备 UE切换到混合小区的方法， 包括：
源基站向目标小区所属的目标基站发送 X2切换请求消息，所述目标小 区为混合小区；
目标基站对所述 UE执行接纳控制，若接纳控制成功，则向移动管理实 体 MME发送路径转移请求消息；
MME判断所述 UE在所述目标小区下的身份， 并将判断结果指示给目 标基站；
目标基站根据 MME的判断结果进行相应处理。
所述源基站向目标小区所属的目标基站发送 X2切换请求消息之前，该 方法还包括：
源基站根据 UE发送的测量报告确定切换的目标小区，所述源基站和目 标基站满足 X2切换基本条件；
源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID相 同， 则源基站按标准流程发起 X2切换； 源基站为宏基站， 或者， 源小区为 开放小区， 或者源小区和目标小区的 CSG ID不相同， 则源基站向目标基站 发送 X2切换请求消息。
所述目标基站对所述 UE执行接纳控制为：
判定源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID 相同， 则目标基站按标准流程对所述 UE进行接纳控制； 否则， 目标基站以 默认的 UE身份对所述 UE执行接纳控制， 所述默认的 UE身份为非成员。 所述目标基站向移动管理实体 MME发送路径转移请求消息为：目标基 站收到来自 UE的 RRC连接重配置完成消息后， 向 MME发送路径转移请 求消息。
所述目标基站对所述 UE执行接纳控制之后， 该方法还包括： 接受所述 X2切换请求， 则目标基站发送切换请求确认消息给源基站； 不接受所述 X2切换请求， 则目标基站发送切换准备失败消息给源基 站。
所述路径转移请求消息中包含目标小区的 CSG ID及接入模式， 所述 MME判断所述 UE在所述目标小区下的身份为： MME根据路径 转移请求消息中包含的 CSG ID、 接入模式及用户签约信息判断 UE在目标 小区下的身份为成员还是非成员，所述 CSG ID在用户签约信息中则判定所 述 UE身份为成员； 所述 CSG ID不在用户签约信息中则判定所述 UE身份 为非成员。
所述 MME将判断结果指示给目标基站为：
MME通过路径转移请求确认消息将判断结果发送给目标基站， 或者， 通过其它现有或新增消息将判断结果发送给目标基站。
所述目标基站根据 MME的判断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则目标基站发送 E-RAB建立 指示给 MME, MME发起 E-RAB建立进程。
所述源基站向目标基站发送的 X2切换请求消息携带所述 UE上报的在 所述目标小区中的身份信息，
所述目标基站对所述 UE执行接纳控制为：基于所述 UE上报的在所述 目标小区中的身份信息执行接纳控制。
所述目标基站对所述 UE执行接纳控制为： 所述 UE上报的在所述目 标小区中的身份为成员时的接纳控制优先级高于所述 UE上报的在所述目 标小区中的身份为非成员时的接纳控制优先级。
所述目标基站根据 MME的判断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则目 标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
所述源基站向目标基站发送 X2切换请求消息之前， 该方法还包括： 判 断目标基站的负载情况， 目标基站负载满足预设的条件， 则继续执行后续 流程。
一种 UE切换到混合小区的系统， 包括源基站、 目标基站和 MME; 其 中，
所述源基站， 设置为向目标小区所属的目标基站发送 X2切换请求消 息， 所述目标小区为混合小区；
所述目标基站，设置为在收到来自源基站的 X2切换请求消息后，对所 述 UE执行接纳控制，若接纳控制成功，则向 MME发送路径转移请求消息； 根据 MME的判断结果进行相应处理；
所述 MME, 设置为根据目标基站发送的路径转移请求消息， 判断所述 UE在所述目标小区下的身份， 并将判断结果指示给目标基站。
所述源基站，还设置为在向目标小区所属的目标基站发送 X2切换请求 消息之前，根据 UE发送的测量报告确定切换的目标小区， 所述源基站和目 标基站满足 X2切换基本条件； 源基站和目标基站都为家庭基站， 且源小区 和目标小区的 CSG ID相同， 则源基站按标准流程发起 X2切换； 源基站为 宏基站， 或者， 源小区为开放小区， 或者源小区和目标小区的 CSG ID不相 同， 则源基站向目标基站发送 X2切换请求消息。 所述目标基站对所述 UE执行接纳控制为：
判定源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID 相同， 则目标基站按标准流程对所述 UE进行接纳控制； 否则， 目标基站以 默认的 UE身份对所述 UE执行接纳控制， 所述默认的 UE身份为非成员。
所述目标基站向移动管理实体 MME发送路径转移请求消息为：目标基 站收到来自 UE的 RRC连接重配置完成消息后， 向 MME发送路径转移请 求消息。
所述目标基站，还设置为在接受所述 X2切换请求后，发送切换请求确 认消息给源基站， 在不接受所述 X2切换请求时， 发送切换准备失败消息给 源基站。
所述 MME判断所述 UE在所述目标小区下的身份为： MME根据路径 转移请求消息中包含的 CSG ID、 接入模式及用户签约信息判断 UE在目标 小区下的身份为成员还是非成员，所述 CSG ID在用户签约信息中则判定所 述 UE身份为成员； 所述 CSG ID不在用户签约信息中则判定所述 UE身份 为非成员。
所述 MME将判断结果指示给目标基站为：
MME通过路径转移请求确认消息将判断结果发送给目标基站， 或者， 通过其它现有或新增消息将判断结果发送给目标基站。
所述目标基站根据 MME的判断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则目标基站发送 E-RAB建立 指示给 MME, MME发起 E-RAB建立进程。
所述源基站向目标基站发送的 X2切换请求消息携带所述 UE上报的在 所述目标小区中的身份信息，
所述目标基站对所述 UE执行接纳控制为：基于所述 UE上报的在所述 目标小区中的身份信息执行接纳控制。 所述目标基站对所述 UE执行接纳控制为： 所述 UE上报的在所述目 标小区中的身份为成员时的接纳控制优先级高于所述 UE上报的在所述目 标小区中的身份为非成员时的接纳控制优先级。
所述目标基站根据 MME的判断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则目 标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
该系统还包括目标基站负载情况判断模块， 设置为判断目标基站的负 载情况， 目标基站负载满足预设的条件， 则通知源基站向目标基站发送 X2 切换请求消息。
一种基站，设置为在收到其他基站发送的目标小区为混合小区的 X2切 换请求消息后， 对相应的 UE执行接纳控制， 若接纳控制成功， 则向 MME 发送路径转移请求消息； 以及根据 MME的判断结果进行相应处理。
所述基站对 UE执行接纳控制为：
判定源基站和所述基站为家庭基站，且源小区和目标小区的 CSG ID相 同， 则按标准流程对所述 UE进行接纳控制； 否则， 以默认的 UE身份对所 述 UE执行接纳控制， 所述默认的 UE身份为非成员。
所述基站根据 MME的判断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则基站发送 E-RAB建立指示 给 MME , MME发起 E-RAB建立进程。
所述基站收到的 X2切换请求消息还携带 UE上报的在目标小区中的身 份信息，
所述基站对 UE执行接纳控制为：基于所述 UE上报的在所述目标小区 中的身份信息执行接纳控制， 所述 UE上报的在所述目标小区中的身份为 成员时的接纳控制优先级高于所述 UE上报的在所述目标小区中的身份为 非成员时的接纳控制优先级。
所述基站根据 MME的判断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE 上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则基站发 送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
本发明实施例提出的 UE切换到混合小区的方法、 系统及基站， 源基站 向目标小区所属的目标基站发送 X2切换请求消息，所述目标小区为混合小 区； 目标基站对所述 UE执行接纳控制， 若接纳控制成功， 则向移动管理实 体 MME发送路径转移请求消息； MME判断所述 UE在所述目标小区下的 身份， 并将判断结果指示给目标基站； 目标基站根据 MME的判断结果进 行相应处理。 通过本发明实施例所述的方案， 在切换过程中能够尽量避免 核心网网元做接入控制， 从而能有效简化切换流程， 降低切换延迟。 附图说明
图 1为部署有家庭基站的 E-UTRAN网络架构示意图；
图 2为本发明实施例描述的 UE切换到混合小区的方法流程示意图； 图 3为本发明实施例 1 UE切换到混合小区的方法流程示意图； 图 4为本发明实施例 2 UE切换到混合小区的方法流程示意图； 图 5为本发明实施例 3 UE切换到混合小区的方法流程示意图； 图 6为本发明实施例 4 UE切换到混合小区的方法流程示意图； 图 7为本发明实施例 5 UE切换到混合小区的方法流程示意图； 图 8为本发明实施例 6 UE切换到混合小区的方法流程示意图。 具体实施方式
源基站向目标小区所属的目标基站发送 X2切换请求消息，所述目标小 区为混合小区； 目标基站对所述 UE执行接纳控制， 若接纳控制成功， 则向 移动管理实体 MME发送路径转移请求消息； MME判断所述 UE在所述目 标小区下的身份， 并将判断结果指示给目标基站； 目标基站根据 MME的 判断结果进行相应处理。
图 1为部署有家庭基站的 E-UTRAN网络架构示意图， 如图 1所示， HeNB可通过 HeNB GW作为 SI代理连接 MME,若 HeNB通过 HeNB GW 作为 SI代理连接到 MME, 则 HeNB GW中继 UE相关的 SI信令。 HeNB 之间存在 X2直接接口， 可通过该 X2直接接口进行切换优化。 在目前的标 准中暂不支持宏基站与家庭基站之间的 X2直接接口， 但对于 LTE后续版 本， 支持宏基站与家庭基站之间的 X2直接接口是合理的也是必要的， 如图 1中的 eNB 3与 HeNB 1之间的 X2接口。
本发明实施例适用于切换到 hybrid小区场景， 具体包括以下三种： 1 )源小区为 open小区， 或者， 源小区为 hybrid小区或 CSG小区且源 小区和目标小区的 CSG ID不相同；
2 ) 源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID 相同；
3 ) 源基站为宏基站， 目标小区为 hybrid小区。
图 2为本发明实施例描述的 UE切换到混合小区的方法流程示意图，如 图 2所示， 该方法包括：
步驟 201 : 源基站收到 UE的测量报告后进行切换判决， 选定切换的目 标小区，本发明实施例中，选定的目标小区为 hybrid模式（即为混合小区）， 且源基站和目标基站满足 X2切换基本条件。
这里， X2切换基本条件为：源基站和目标基站连接在同一个 MME pool, 且源基站和目标基站间存在 X2接口。
步驟 202: 判定源基站和目标基站都为家庭基站，且源小区和目标小区 的 CSG ID相同， 则转到步驟 203 ; 否则， 源基站为宏基站， 或者， 源小区 为开放小区， 或者源小区和目标小区的 CSG ID不相同， 转到步驟 204。
步驟 203 : 源基站发起 X2切换。 这里， 源基站发起 X2切换的流程和 目标基站的接纳控制流程按照现有标准流程执行。
步驟 204: 源基站发送 X2切换请求消息给目标基站， 目标基站对所述 UE执行接纳控制。
可选的， 目标基站基于默认的 UE 身份执行接纳控制。 这里， 默认的 UE身份为非成员， 目标基站基于默认的 UE身份执行接纳控制即根据当前 空闲资源状态、该切换请求消息中请求建立 E-RAB的 Qos信息和优先等级 来决定接纳或拒绝该切换请求。 即目标基站使用默认优先等级进行接纳控 制， 对于 hybrid模式基站默认优先等级为基于非成员身份的等级。
可选的， 源基站向目标基站发送的 X2切换请求消息携带所述 UE上报 的在所述目标小区中的身份信息，目标基站基于 UE上报的在所述目标小区 中的身份信息执行接纳控制。具体的， UE上报的在所述目标小区中的身份 为成员时的接纳控制优先级高于 UE上报的在所述目标小区中的身份为非 成员时的接纳控制优先级。
可选的， 目标基站对 UE执行接纳控制之后， 进一步包括：
若接受该 X2切换请求， 则发送切换请求确认消息给源 (H)eNB ;
若不接受该 X2切换请求， 则发送切换准备失败消息给源 (H)eNB。 步驟 205 : 目标基站收到 RRC连接重配置完成消息， 则向 MME发送 路径转移请求消息。
该消息中包含目标小区的 CSG ID及 access mode (本发明实施例中取 值为 hybrid )。 步驟 206: MME收到目标基站发送的路径转移请求消息后， 判断 UE 在所述目标小区下的身份， 并将判断结果指示给目标基站。
这里， MME具体根据路径转移请求消息中包含的 CSG ID、 access mode 及用户签约信息判断 UE在该 hybrid模式目标小区下的身份为成员还是非 成员，若该 CSG ID在用户签约信息中则判断 UE身份为成员，若该 CSG ID 不在用户签约信息中则判断 UE身份为非成员。
MME可以通过路径转移请求确认消息将 UE身份发送给目标基站， 也 可以通过其它现有或新增消息将 UE身份发送给目标 HeNB。
步驟 207: 目标基站根据 MME的判断结果进行相应处理。
目标基站以默认的 UE身份对所述 UE执行接纳控制的情况下， 如果 MME的判断结果指示 UE身份为成员， 则目标基站发送 E-RAB建立指示 给 MME, MME发起 E-RAB建立进程。
目标基站基于 UE上报的在所述目标小区中的身份信息执行接纳控制 的情况下， 如果 UE上报的身份为成员， 而 MME的判断结果指示 UE身份 为非成员， 则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB 释放进程； 如果 UE上报的身份为非成员， 而 MME的判断结果指示 UE身 份为成员 , 则目标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB 建立进程。
进一步的，目标基站可以根据 MME的判断结果更新该 UE的身份信息， 调整该 UE的优先等级， 用于后续进行接纳控制。
需要说明的是， 本发明实施例还可以进一步考虑目标基站的负载， 即 在执行步驟 204之前， 判断 HeNB负载情况， 若目标 HeNB负载较高， 则 按照现有标准流程发起 S1或 X2切换； 否则， 目标基站负载满足预设的条 件， 按本发明实施例所述的方法发起 X2切换。
本发明实施例还相应地提出一种 UE切换到混合小区的系统，该系统包 括： 源基站、 目标基站和 MME; 其中，
所述源基站， 设置为在为 UE选定目标小区后， 向目标基站发送 X2切 换请求消息， 所述目标小区为混合小区；
所述目标基站，设置为在收到来自源基站的 X2切换请求消息后， 对所 述 UE执行接纳控制， 接受所述 X2切换请求， 则向 MME发送路径转移请 求消息； 根据 MME的判断结果进行相应处理；
所述 MME, 设置为根据目标基站发送的路径转移请求消息， 判断所述 UE在所述目标小区下的身份， 并将判断结果指示给目标基站。
所述源基站为 UE选定目标小区后， 向目标基站发送 X2切换请求消息 为：
源基站根据 UE发送的测量报告确定切换的目标小区，所述源基站和目 标基站满足 X2切换基本条件；
源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID相 同， 则源基站按标准流程发起 X2切换； 源基站为宏基站， 或者， 源小区为 开放小区， 或者源小区和目标小区的 CSG ID不相同， 则源基站向目标基站 发送 X2切换请求消息。
所述目标基站对所述 UE执行接纳控制为：
判定源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID 相同， 则目标基站按标准流程对所述 UE进行接纳控制； 否则， 目标基站以 默认的 UE身份对所述 UE执行接纳控制， 所述默认的 UE身份为非成员。
所述目标基站，还设置为在接受所述 X2切换请求后，发送切换请求确 认消息给源基站， 在不接受所述 X2切换请求时，发送切换准备失败消息给 源基站。
所述 MME判断所述 UE在所述目标小区下的身份为： MME根据路径 转移请求消息中包含的 CSG ID、 接入模式及用户签约信息判断 UE在目标 小区下的身份为成员还是非成员，所述 CSG ID在用户签约信息中则判定所 述 UE身份为成员； 所述 CSG ID不在用户签约信息中则判定所述 UE身份 为非成员。
所述 MME将判断结果指示给目标基站为：
MME通过路径转移请求确认消息将判断结果发送给目标基站， 或者， 通过其它现有或新增消息将判断结果发送给目标基站。
所述目标基站根据 MME的判断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则目标基站发送 E-RAB建立 指示给 MME, MME发起 E-RAB建立进程。
所述源基站向目标基站发送的 X2切换请求消息携带所述 UE上报的在 所述目标小区中的身份信息，
所述目标基站对所述 UE执行接纳控制为：基于所述 UE上报的在所述 目标小区中的身份信息执行接纳控制。
所述目标基站对所述 UE执行接纳控制为： 所述 UE上报的在所述目 标小区中的身份为成员时的接纳控制优先级高于所述 UE上报的在所述目 标小区中的身份为非成员时的接纳控制优先级。
所述目标基站根据 MME的判断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则目 标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
该系统还包括目标基站负载情况判断模块， 设置为判断目标基站的负 载情况， 目标基站负载满足预设的条件， 则通知源基站向目标基站发送 X2 切换请求消息。
本发明实施例还相应地公开了一种基站， 该基站设置为在收到其他基 站发送的目标小区为混合小区的 X2切换请求消息后， 对相应的 UE执行接 纳控制， 若接纳控制成功， 则向 MME发送路径转移请求消息； 以及根据 MME的判断结果进行相应处理。
所述基站对 UE执行接纳控制为：
判定源基站和所述基站为家庭基站，且源小区和目标小区的 CSG ID相 同， 则按标准流程对所述 UE进行接纳控制； 否则， 以默认的 UE身份对所 述 UE执行接纳控制， 所述默认的 UE身份为非成员。
所述基站根据 MME的判断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则基站发送 E-RAB建立指示 给 MME, MME发起 E-RAB建立进程。
所述基站收到的 X2切换请求消息还携带 UE上报的在目标小区中的身 份信息，
所述基站对 UE执行接纳控制为：基于所述 UE上报的在所述目标小区 中的身份信息执行接纳控制， 所述 UE上报的在所述目标小区中的身份为 成员时的接纳控制优先级高于所述 UE上报的在所述目标小区中的身份为 非成员时的接纳控制优先级。
所述基站根据 MME的判断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE 上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则基站发 送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
为了使本发明的描述更加明确， 下面结合具体实施例和附图对本发明 进行详细说明。
实施例 1
本实施例描述的是目标 HeNB基于 UE的默认身份执行接纳控制情况 下， MME通过路径转移请求确认消息指示 UE身份的方法。 图 3为本发明 实施例 1 UE切换到混合小区的方法流程示意图，如图 3所示，该方法包括： 步驟 301 : UE发送测量报告给源 (H)eNB。 该测量报告至少包括目标基 站的物理小区标识 PCI (Physical Cell ID)。
步驟 302: 源 (H)eNB (可能是宏站或者是家庭基站）根据测量报告选 定切换目标基站， 并可根据 PCI来判断切换目标基站的类型。
步驟 303: 如果目标基站为 hybrid模式家庭基站， 且满足 X2切换基本 条件 (源和目的基站之间有 X2接口， 且都连接在同一个 MME pool ), 源和 目标小区 CSG ID不相同， 则发送 X2切换请求消息给目标 HeNB。
步驟 304: 目标 HeNB收到 X2切换请求消息后， 根据当前空闲资源状 态、该切换请求消息中请求建立 E-RAB的 Qos信息和优先等级来做接纳控 制， 即接纳或拒绝该切换请求。 本发明中此处目标 HeNB使用默认优先等 级进行接纳控制， 对于 hybrid模式 HeNB默认优先等级为基于非成员身份 的等级。
步驟 305:若目标 HeNB接纳至少一个 non-GBR E-RAB,则目标 HeNB 为该 UE预留相关资源并发送 X2切换请求确认消息给源 (H)eNB。该消息中 包含用于指示 UE进行切换的 RRC消息， 即 RRC连接重配置消息。 否贝' J , 发送切换准备失败消息给源 (H)eNB, 并终止该流程。 该消息中还包含目标 HeNB接纳的 E-RAB列表和目标 HeNB未接纳的 E-RAB列表。
步驟 306: 源 (H)eNB将 RRC连接重配置消息通过空口发送给 UE以指 示 UE进行相应切换操作。
步驟 307: 如果需要， 源 (H)eNB发送 SN状态转移（ SN status transfer ) 消息给目标 HeNB以传递上下行 PDCP SN状态。
步驟 308: UE成功接入目标 HeNB后， 发送 RRC连接重配置完成消 息给目标 (H)eNB。 步驟 309: 目标 HeNB发送路径转移请求消息给 MME以通知该 UE己 经更换小区。 该消息中包含目标 HeNB 的 CSG ID, 且 access mode值 为，， hybrid"。
步驟 310: MME收到路径转移请求消息后， 根据该消息中包含的 CSG ID\access mode及用户签约信息判断 UE在该 hybrid模式目标 HeNB下的身 份为成员还是非成员。若该 CSG ID在用户签约信息中则判断 UE身份为成 员， 若该 CSG ID不在用户签约信息中则判断 UE身份为非成员。 在至少一 个 E-RAB的用户平面的路径转移成功后， MME发送路径转移请求确认消 息给目标 HeNB。 MME通过该消息将 UE身份指示目标 HeNB。
MME可通过以下两种方法来指示 UE身份。 第一种方法是在路径转移 请求确认消息中新增 "UE身份指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则其值为 "非成员"； 第二种方法是在路径转移请求确认消息 中新增 "UE身份指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则消息中不携带该信元。
步驟 311: 目标 HeNB收到路径转移请求确认消息后， 根据 MME的判 断结果更新该 UE的身份并调整其优先等级，用于后续对该 UE进行接纳控 制。
步驟 312: 目标 HeNB发送用户上下文释放消息给源 (H)eNB, 以释放 源 (H)eNB上的用户相关资源。
步驟 313: 若步驟 310中 MME指示给目标 HeNB该 UE为目标小区的 成员用户， 则目标 HeNB发送 E-RAB建立指示消息给 MME, 该消息包含 步驟 305中所述 X2切换请求确认消息中目标 HeNB未接纳的 E-RAB列表。
步驟 314: MME向目标 HeNB发送 E-RAB建立消息，该消息中 E-RAB 建立列表为步驟 313中所包含 E-RAB列表。
步驟 315:目标 HeNB向 UE发送 RRC连接重配置消息，以建立 E-RAB 所对应的 DRB (数据无线承载）。
步驟 316: UE完成所配置的 DRB建立后回复 RRC连接重配置完成消 息给目标 HeNB。
步驟 317: 目标 HeNB回复 E-RAB建立响应消息给 MME。 实施例 2
本实施例描述的是目标 HeNB基于 UE的默认身份执行接纳控制情况 下， MME通过 UE身份指示消息指示 UE身份的方法， 本实施例与实施例 1的不同之处在于， MME收到路径转移请求消息后判断 UE在该 hybrid模 式目标 HeNB下的身份， 立即将该身份指示给目标 HeNB。
图 4为本发明实施例 2 UE切换到混合小区的方法流程示意图， 如图 4 所示， 步驟 401-409、 步驟 411、 步驟 413-418 与实施例 1 流程图中步驟 301-309、 步驟 311、 步驟 312-317相同， 在此不重复叙述。
步驟 410: MME收到路径转移请求消息后， 根据该消息中包含的 CSG ID,、 access mode及用户签约信息判断 UE在该 hybrid模式目标 HeNB下的 身份为成员还是非成员。 若该 CSG ID在用户签约信息中则判断 UE身份为 成员， 若该 CSG ID不在用户签约信息中则判断 UE身份为非成员。 判断完 成之后 MME立即发送 UE身份指示消息将该 UE身份指示目标 HeNB。
MME可通过以下两种方法来指示 UE身份。 第一种方法是在 UE身份 指示消息中携带 "UE 身份指示" 信元， 若为成员， 则其值为 "成员"， 若 为非成员， 则其值为 "非成员"； 第二种方法是在 UE身份指示消息中携带 "UE 身份指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则消 息中不携带该信元。
步驟 412: MME与 Serving-GW交互用户面更新请求 /响应消息， 在至 少一个 E-RAB的用户平面的路径转移成功后， MME发送路径转移请求确 认消息给目标 HeNB。 实施例 3
本实施例描述的是源基站在切换判决时根据目标基站的负载情况， 也 即无线资源使用状况来决定是否采用实施例 1或实施例 2所述方法。 这样 可以在目标 HeNB负载较重的情况下， 保证成员身份的用户的接入成功率。 图 5为本发明实施例 3 UE切换到混合小区的方法流程示意图，如图 5所示， 该方法包括：
步驟 501 : 源基站收到 UE的测量报告后， 根据 PCI判断目标 HeNB为 hybrid模式。 并且源和目标基站间存在 X2接口， 源和目标基站连接在同一 个 MME pool。
步驟 502: 若源基站检测到目标 HeNB 负载较高， 则不采用实施例 1 或实施例 2所述方法， 而按现有标准流程发起 S1或 X2切换。
步驟 503: 若源基站检测到目标 HeNB负载不高， 则采用实施例 1或实 施例 2所述方法发起 X2切换。
需要说明的是， 源基站可以通过资源状态请求消息来请求目标 HeNB 回复资源状态响应消息来获取目标 HeNB 的无线资源使用状态。 也可以通 过资源状态更新消息得到目标 HeNB的无线资源使用状态。
步驟 504: 若目标 HeNB负载较高， 并且源基站为家庭基站， 源和目标 小区的 CSG ID相同， 则按现有标准流程发起 X2切换。
步驟 505: 若目标 HeNB负载较高， 并且不满足步驟 504中所述源基站 为家庭基站， 源和目标小区的 CSG ID相同条件， 则按现有标准流程发起 S1切换。 实施例 4
本实施例描述的是目标 HeNB基于 UE上报的在目标小区中的身份执行 接纳控制情况下， UE上报为成员， 且 MME通过路径转移请求确认消息确 认该 UE为成员的情况。 图 6为本发明实施例 4 UE切换到混合小区的方法 流程示意图， 如图 6所示， 该方法包括：
步驟 601: UE发送测量报告给源 (H)eNB。 在本实施例中， UE在该测 量报告中上报其为目标 hybrid cell的成员。
步驟 602: 源 (H)eNB (可能为宏基站或者家庭基站）根据测量报告选 定切换目标基站， 并可根据测量报告中的 PCI来判断切换目标基站的类型 , 并判断是否满足 X2切换基本条件（源和目的基站之间有 X2接口， 且都连 接在同一个 MME pool ), 若满足， 则发起 X2切换， 若不满足， 则发起 S1 切换。 本实施例中假设选定的切换目标基站为 hybrid模式。
步驟 603: 若源和目标小区 CSG ID相同， 则按现有标准协议流程， 源 小区发送 X2切换请求消息给目标小区； 若源和目标小区 CSG ID不相同， 或源基站为宏基站， 源小区发送 X2切换请求消息给目标小区， 该消息中携 带 UE在测量报告中上报的在该目标小区的身份，该实施例中 UE报其为该 目标 hybrid 小区的成员。
步驟 604: 目标 HeNB收到 X2切换请求消息后， 根据当前空闲资源状 态、该切换请求消息中请求建立 E-RAB的 QoS信息和优先等级来做接纳控 制， 即接纳或拒绝该切换请求。本实施例中目标 HeNB基于 UE上报的身份 相应的优先等级进行接纳控制（本实施例中 UE上 4艮为该目标小区的成员）。
步驟 605:若目标 HeNB接纳至少一个 non-GBR E-RAB,则目标 HeNB 为该 UE预留相关资源并发送 X2切换请求确认消息给源 (H)eNB。该消息中 包含用于指示 UE进行切换的 RRC消息， 即 RRC连接重配置消息。 否贝' J , 发送切换准备失败消息给源 (H)eNB, 并终止该流程。
步驟 606: 源 (H)eNB将 RRC连接重配置消息通过空口发送给 UE以指 示 UE进行相应切换操作。
步驟 607:如果需要，源 (H)eNB发送 SN status transfer消息给目标 HeNB 以传递上下行 PDCP SN状态。
步驟 608: UE成功接入目标 HeNB后，发送 RRC连接重配置完成消息 给目标 (H)eNB。
步驟 609: 目标 HeNB发送路径转移请求消息给 MME以通知该 UE己 经更换小区。 由于目标小区为 hybrid,该消息中包含目标 HeNB的 CSG ID, 且 access mode值为 "hybrid"。
步驟 610: MME收到路径转移请求消息后， 根据该消息中包含的 CSG ID\access mode及用户签约信息判断 UE在该 hybrid模式目标 HeNB下的身 份为成员还是非成员。若该 CSG ID在用户签约信息中则判断 UE身份为成 员， 若该 CSG ID不在用户签约信息中则判断 UE身份为非成员。 在至少一 个 E-RAB的用户平面的路径转移成功后， MME发送路径转移请求确认消 息给目标 HeNB , 并通过该消息将该 MME判断的该 UE在目标小区的身份 指示给目标 HeNB。
MME可通过以下方法来指示 UE身份。 可以在路径转移请求确认消息 中新增 "UE身份指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则其值为 "非成员"； 或者可以在路径转移请求确认消息中新增 "UE 身份 指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则消息中不携带 该信元。
在本实施例中 , MME判断 UE在目标 hybrid小区为成员。
步驟 611: 目标 HeNB收到路径转移请求确认消息后， 确认 UE在目标 hybrid小区为成员， 并保存该 UE身份用于后续对该 UE进行接纳控制。
步驟 612: 目标 HeNB发送用户上下文释放消息给源 (H)eNB, 以释放 源 (H)eNB上的用户相关资源。 实施例 5
本实施例描述的是目标 HeNB基于 UE上报的在目标小区中的身份执行 接纳控制情况下， UE上报为成员， 且 MME通过路径转移请求确认消息确 认该 UE为非成员的情况。 本实施例与实施例 4的不同之处在于， MME收 到路径转移请求消息后， 根据 CSG ID, access mode与用户签约信息判断 UE在目标 hybrid小区为非成员， 图 7为本发明实施例 5 UE切换到混合小 区的方法流程示意图， 如图 7所示， 该方法包括：
步驟 701-709与实施例 4中步驟 601-609相同， 在此不重复叙述。 步驟 710: MME收到路径转移请求消息后， 根据该消息中包含的 CSG ID, access mode及用户签约信息判断 UE在该 hybrid模式目标 HeNB下的身 份为成员还是非成员。若该 CSG ID在用户签约信息中则判断 UE身份为成 员， 若该 CSG ID不在用户签约信息中则判断 UE身份为非成员。 判断完成 之后 MME立即发送 UE身份指示消息将该 UE身份指示目标 HeNB。
MME可通过以下两种方法来指示 UE身份。 第一种方法是在 UE身份 指示消息中携带 "UE 身份指示" 信元， 若为成员， 则其值为 "成员"， 若 为非成员， 则其值为 "非成员"； 第二种方法是在 UE身份指示消息中携带 "UE 身份指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则消 息中不携带该信元。
在本实施例中， MME判断 UE在目标 hybrid小区为非成员。
步驟 711: 目标小区接收到路径转移请求确认消息后获得 MME判断的 UE在目标小区的身份。 在本实施例中 MME确认 UE为非成员， 由于步驟 704中对 UE执行基于成员身份所对应的优先等级的接纳控制， 则目标小区 根据自身负载情况自行决定（如何决定是否发送为具体实现相关， 比如目 标小区若负载较重， 则发送 E-RAB释放指示消息 )是否发送 E-RAB释放 指示消息给 MME, 该消息中需携带需要释放的 E-RAB列表， 以触发 MME 发起 E-RAB释放进程。
步驟 712: 目标 HeNB发送用户上下文释放消息给源 (H)eNB, 以释放 源 (H)eNB上的用户相关资源。该步驟在步驟 701之后，但与可能在步驟 713、 步驟 714之前或之后。
步驟 713: MME发送 E-RAB释放命令消息给目标 HeNB , 该消息中携 带步驟 711消息中的需要释放的 E-RAB列表， 以指示目标 HeNB释放相关 E-RAB。
步驟 714: 目标 HeNB发送 RRC连接重配置消息给 UE以释放相关 E-RAB的空口资源 DRB。
步驟 715: UE完成相关 DRB的释放后回复 RRC连接重配置完成消息 给目标 HeNB。
步驟 716: 目标 HeNB确认释放相关 E-RAB , 发送 E-RAB释放响应消 息给 MME。 实施例 6
本实施例描述的是目标 HeNB基于 UE上报的在目标小区中的身份执行 接纳控制情况下， MME通过 UE身份指示消息指示 UE身份的方法， 在本 实施例中， MME收到路径转移请求消息后判断 UE在该 hybrid模式目标 HeNB下的身份后， 立即将该 UE身份指示给目标 HeNB。 图 8为本发明实 施例 6 UE切换到混合小区的方法流程示意图， 如图 8所示， 该方法包括： 步驟 801-809与实施例 4中步驟 601-609相似， 在此不重复叙述， 其中 步驟 801、 步驟 803、 步驟 804中 UE身份可能是成员或者非成员。
步驟 810: MME收到路径转移请求消息后， 根据该消息中包含的 CSG ID,、 access mode及用户签约信息判断 UE在该 hybrid模式目标 HeNB下的 身份为成员还是非成员。若该 CSG ID在用户签约信息中则判断 UE身份为 成员， 若该 CSG ID不在用户签约信息中则判断 UE身份为非成员。 判断完 成之后 MME立即发送 UE身份指示消息将该 UE身份指示目标 HeNB。
MME可通过以下两种方法来指示 UE身份。 第一种方法是在 UE身份 指示消息中携带 "UE 身份指示" 信元， 若为成员， 则其值为 "成员"， 若 为非成员， 则其值为 "非成员"； 第二种方法是在 UE身份指示消息中携带 "UE 身份指示" 信元， 若为成员， 则其值为 "成员"， 若为非成员， 则消 息中不携带该信元。
步驟 811: 若 UE上报的身份为成员， 而 MME的判断结果指示 UE身 份为非成员 ,则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB 释放进程； UE上报的身份为非成员， 而 MME的判断结果指示 UE身份为 成员 , 则目标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB建立 进程。 E-RAB建立进程和 E-RAB释放进程见实施例 1、 实施例 5所述。
步驟 812: 目标 HeNB确认释放相关 E-RAB的情况下，发送 E-RAB释 放响应消息给 MME。
步驟 813: MME与 Serving-GW交互用户面更新请求 /响应消息， 在至 少一个 E-RAB的用户平面的路径转移成功后， MME发送路径转移请求确 认消息给目标 HeNB。 该步驟在步驟 809之后， 但有可能在步驟 811、 步驟 812、 步驟 814之前或之后。
步驟 814: 目标 HeNB发送用户上下文释放消息给源 (H)eNB, 以释放 源 (H)eNB上的用户相关资源。
需要说明的是， 与实施例 3类似， 源基站在切换判决时可以根据目标 基站的负载情况，也即无线资源使用状况来决定是否采用实施例 4、 实施例 5或实施例 6所述方法。这样可以在目标 HeNB负载较重的情况下，保证成 员身份的用户的接入成功率。
可以看出，本发明提出的 UE切换到混合小区的方法及系统， 能有效简 化切换流程， 降低切换延迟。
上述说明示出并描述了本发明的优选实施例， 但如前所述， 应当理解 本发明并非局限于本文所披露的形式， 不应看作是对其他实施例的排除， 而可用于各种其他组合、 修改和环境， 并能够在本文所述发明构想范围内， 通过上述教导或相关领域的技术或知识进行改动。 而本领域人员所进行的 改动和变化不脱离本发明的精神和范围， 则都应在本发明所附权力要求的 保护范围内。

Claims

权利要求书
1、 一种用户设备 UE切换到混合小区的方法， 其中， 该方法包括： 源基站向目标小区所属的目标基站发送 X2切换请求消息，所述目标小 区为混合小区；
目标基站对所述 UE执行接纳控制，若接纳控制成功， 则向移动管理实 体 MME发送路径转移请求消息；
MME判断所述 UE在所述目标小区下的身份， 并将判断结果指示给目 标基站；
目标基站根据 MME的判断结果进行相应处理。
2、 根据权利要求 1所述的方法， 其中， 所述源基站向目标小区所属的 目标基站发送 X2切换请求消息之前， 该方法还包括：
源基站根据 UE发送的测量报告确定切换的目标小区，所述源基站和目 标基站满足 X2切换基本条件；
源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID相 同， 则源基站按标准流程发起 X2切换； 源基站为宏基站， 或者， 源小区为 开放小区， 或者源小区和目标小区的 CSG ID不相同， 则源基站向目标基站 发送 X2切换请求消息。
3、 根据权利要求 1所述的方法， 其中， 所述目标基站对所述 UE执行 接纳控制为：
判定源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID 相同， 则目标基站按标准流程对所述 UE进行接纳控制； 否则， 目标基站以 默认的 UE身份对所述 UE执行接纳控制， 所述默认的 UE身份为非成员。
4、 根据权利要求 1所述的方法， 其中， 所述目标基站向移动管理实体 MME发送路径转移请求消息为： 目标基站收到来自 UE的 RRC连接重配 置完成消息后， 向 MME发送路径转移请求消息。
5、 根据权利要求 1所述的方法， 其中， 该方法还包括： 接受所述 X2切换请求， 则目标基站发送切换请求确认消息给源基站； 不接受所述 X2切换请求， 则目标基站发送切换准备失败消息给源基 站。
6、 根据权利要求 1所述的方法， 其中， 所述路径转移请求消息中包含 目标小区的 CSG ID及接入模式，
所述 MME判断所述 UE在所述目标小区下的身份为： MME根据路径 转移请求消息中包含的 CSG ID、 接入模式及用户签约信息判断 UE在目标 小区下的身份为成员还是非成员，所述 CSG ID在用户签约信息中则判定所 述 UE身份为成员； 所述 CSG ID不在用户签约信息中则判定所述 UE身份 为非成员。
7、 根据权利要求 1所述的方法， 其中， 所述 MME将判断结果指示给 目标基站为：
MME通过路径转移请求确认消息将判断结果发送给目标基站， 或者， 通过其它现有或新增消息将判断结果发送给目标基站。
8、 根据权利要求 1所述的方法， 其中， 所述目标基站根据 MME的判 断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则目标基站发送 E-RAB建立 指示给 MME, MME发起 E-RAB建立进程。
9、 根据权利要求 1、 2、 4、 5、 6或 7所述的方法， 其中， 所述源基站 向目标基站发送的 X2切换请求消息携带所述 UE上报的在所述目标小区中 的身份信息，
所述目标基站对所述 UE执行接纳控制为：基于所述 UE上报的在所述 目标小区中的身份信息执行接纳控制。
10、根据权利要求 9所述的方法， 其中， 所述目标基站对所述 UE执行 接纳控制为： 所述 UE上报的在所述目标小区中的身份为成员时的接纳控 制优先级高于所述 UE上报的在所述目标小区中的身份为非成员时的接纳 控制优先级。
11、根据权利要求 9所述的方法， 其中， 所述目标基站根据 MME的判 断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则目 标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
12、 根据权利要求 1 所述的方法， 其中， 所述源基站向目标基站发送
X2切换请求消息之前， 该方法还包括： 判断目标基站的负载情况， 目标基 站负载满足预设的条件， 则继续执行后续流程。
13、 一种 UE切换到混合小区的系统， 其中， 该系统包括源基站、 目标 基站和 MME; 其中，
所述源基站， 设置为向目标小区所属的目标基站发送 X2切换请求消 息， 所述目标小区为混合小区；
所述目标基站，设置为在收到来自源基站的 X2切换请求消息后， 对所 述 UE执行接纳控制，若接纳控制成功，则向 MME发送路径转移请求消息； 根据 MME的判断结果进行相应处理；
所述 MME, 设置为根据目标基站发送的路径转移请求消息， 判断所述
UE在所述目标小区下的身份， 并将判断结果指示给目标基站。
14、 根据权利要求 13所述的系统， 其中，
所述源基站，还设置为在向目标小区所属的目标基站发送 X2切换请求 消息之前，根据 UE发送的测量报告确定切换的目标小区， 所述源基站和目 标基站满足 X2切换基本条件； 源基站和目标基站都为家庭基站， 且源小区 和目标小区的 CSG ID相同， 则源基站按标准流程发起 X2切换； 源基站为 宏基站， 或者， 源小区为开放小区， 或者源小区和目标小区的 CSG ID不相 同， 则源基站向目标基站发送 X2切换请求消息。
15、 根据权利要求 13所述的系统， 其中， 所述目标基站对所述 UE执 行接纳控制为：
判定源基站和目标基站都为家庭基站， 且源小区和目标小区的 CSG ID 相同， 则目标基站按标准流程对所述 UE进行接纳控制； 否则， 目标基站以 默认的 UE身份对所述 UE执行接纳控制， 所述默认的 UE身份为非成员。
16、 根据权利要求 13所述的系统， 其中， 所述目标基站向移动管理实 体 MME发送路径转移请求消息为： 目标基站收到来自 UE的 RRC连接重 配置完成消息后， 向 MME发送路径转移请求消息。
17、 根据权利要求 13所述的系统， 其中，
所述目标基站，还设置为在接受所述 X2切换请求后，发送切换请求确 认消息给源基站， 在不接受所述 X2切换请求时， 发送切换准备失败消息给 源基站。
18、 根据权利要求 13所述的系统， 其中， 所述 MME判断所述 UE在 所述目标小区下的身份为： MME根据路径转移请求消息中包含的 CSG ID、 接入模式及用户签约信息判断 UE在目标小区下的身份为成员还是非成员， 所述 CSG ID在用户签约信息中则判定所述 UE身份为成员； 所述 CSG ID 不在用户签约信息中则判定所述 UE身份为非成员。
19、 根据权利要求 13所述的系统， 其中， 所述 MME将判断结果指示 给目标基站为：
MME通过路径转移请求确认消息将判断结果发送给目标基站， 或者， 通过其它现有或新增消息将判断结果发送给目标基站。
20、 根据权利要求 13所述的系统， 其中， 所述目标基站根据 MME的 判断结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则目标基站发送 E-RAB建立 指示给 MME, MME发起 E-RAB建立进程。
21、 根据权利要求 13、 14、 17、 18或 19所述的系统， 其中， 所述源 基站向目标基站发送的 X2切换请求消息携带所述 UE上报的在所述目标小 区中的身份信息，
所述目标基站对所述 UE执行接纳控制为：基于所述 UE上报的在所述 目标小区中的身份信息执行接纳控制。
22、 根据权利要求 21所述的系统， 其中， 所述目标基站对所述 UE执 行接纳控制为： 所述 UE上报的在所述目标小区中的身份为成员时的接纳 控制优先级高于所述 UE上报的在所述目标小区中的身份为非成员时的接 纳控制优先级。
23、 根据权利要求 21所述的系统， 其中， 所述目标基站根据 MME的 判断结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则目标基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则目 标基站发送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
24、 根据权利要求 13所述的系统， 其中， 该系统还包括目标基站负载 情况判断模块， 设置为判断目标基站的负载情况， 目标基站负载满足预设 的条件， 则通知源基站向目标基站发送 X2切换请求消息。
25、 一种基站， 其中， 该基站设置为在收到其他基站发送的目标小区 为混合小区的 X2切换请求消息后， 对相应的 UE执行接纳控制， 若接纳控 制成功， 则向 MME发送路径转移请求消息； 以及根据 MME的判断结果进 行相应处理。
26、 根据权利要求 25所述的基站， 其中， 所述基站对 UE执行接纳控 制为：
判定源基站和所述基站为家庭基站，且源小区和目标小区的 CSG ID相 同， 则按标准流程对所述 UE进行接纳控制； 否则， 以默认的 UE身份对所 述 UE执行接纳控制， 所述默认的 UE身份为非成员。
27、 根据权利要求 26所述的基站， 其中， 所述基站根据 MME的判断 结果进行相应处理为：
MME的判断结果指示 UE身份为成员， 则基站发送 E-RAB建立指示 给 MME, MME发起 E-RAB建立进程。
28、 根据权利要求 25所述的基站， 其中， 所述基站收到的 X2切换请 求消息还携带 UE上报的在目标小区中的身份信息，
所述基站对 UE执行接纳控制为：基于所述 UE上报的在所述目标小区 中的身份信息执行接纳控制， 所述 UE上报的在所述目标小区中的身份为 成员时的接纳控制优先级高于所述 UE上报的在所述目标小区中的身份为 非成员时的接纳控制优先级。
29、 根据权利要求 28所述的基站， 其中， 所述基站根据 MME的判断 结果进行相应处理为：
UE上报的身份为成员， 而 MME的判断结果指示 UE身份为非成员， 则基站发送 E-RAB释放指示给 MME, MME发起 E-RAB释放进程； UE 上报的身份为非成员， 而 MME的判断结果指示 UE身份为成员， 则基站发 送 E-RAB建立指示给 MME, MME发起 E-RAB建立进程。
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