WO2012155657A1 - Procédé, système et station de base permettant le transfert d'un équipement utilisateur vers une cellule hybride - Google Patents

Procédé, système et station de base permettant le transfert d'un équipement utilisateur vers une cellule hybride 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)
Chinese (zh)
Inventor
黄莹
奚进
陈琳
谢峰
祝建建
翟恒星
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中兴通讯股份有限公司
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Publication of WO2012155657A1 publication Critical patent/WO2012155657A1/fr

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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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Abstract

L'invention porte sur un procédé permettant le transfert d'un équipement utilisateur (UE) vers une cellule hybride, lequel procédé comprend les étapes suivantes : une station de base (BS) source adresse un message de requête de transfert x2 à une BS cible à laquelle une cellule cible appartient, la cellule cible étant une cellule hybride ; la BS cible réalise un contrôle d'accès auprès de l'UE, si le contrôle d'accès est passé avec succès, la BS cible adresse alors un message de requête de commutation de chemin à une entité de gestion de la mobilité (MME) ; la MME évalue l'identité de l'UE dans la cellule cible et indique le résultat de l'évaluation à la BS cible ; et la BS cible travaille en fonction du résultat d'évaluation de la MME. L'invention concerne également un système et une BS permettant le transfert d'un UE vers une cellule hybride. Selon la présente invention, l'élément de coeur de réseau peut être essayé pour éviter l'exécution d'un contrôle d'accès lors du transfert, ce qui permet de simplifier efficacement la procédure de transfert et de réduire le délai de transfert.
PCT/CN2012/072734 2011-07-27 2012-03-21 Procédé, système et station de base permettant le transfert d'un équipement utilisateur vers une cellule hybride WO2012155657A1 (fr)

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