WO2012126216A1 - 一种用户终端跨基站的切换方法和lte系统 - Google Patents

一种用户终端跨基站的切换方法和lte系统 Download PDF

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Publication number
WO2012126216A1
WO2012126216A1 PCT/CN2011/076376 CN2011076376W WO2012126216A1 WO 2012126216 A1 WO2012126216 A1 WO 2012126216A1 CN 2011076376 W CN2011076376 W CN 2011076376W WO 2012126216 A1 WO2012126216 A1 WO 2012126216A1
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Prior art keywords
user terminal
establishment
handover
target cell
information
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PCT/CN2011/076376
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English (en)
French (fr)
Inventor
彭聪
郑伟
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中兴通讯股份有限公司
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Publication of WO2012126216A1 publication Critical patent/WO2012126216A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point

Definitions

  • the present invention relates to the field of LTE (Long Term Evolution) wireless communication technologies, and in particular, to a method for handover of a user terminal across a base station and an LTE system.
  • LTE Long Term Evolution
  • the state of the user equipment (UE, User Equipment) is divided into two types: a connected state (RRC_CONNECTED) and an idle state (RRC_IDLE).
  • RRC_CONNECTED a connected state
  • RRC_IDLE an idle state
  • the handover is divided into handover within the eNB (Evolved NodeB, evolved Node B) and handover between the eNBs.
  • the handover in the eNB means that the source cell and the target cell of the handover are located in the same eNB; the handover between the eNBs means that the source cell and the target cell of the handover are located in different eNBs.
  • EPC Evolved Packet Core
  • the inter-eNB handover is further divided into X2 interface switching and S1 interface. Switching, whether the UE performs non-competitive random access points in the target cell, and is divided into competitive switching and non-competitive switching.
  • the LTE system introduces a technology: RRC (Radio Resource Control) re-establishment, the purpose of this technology is to re-establish an RRC connection, which involves SRB1 (Signaling Radio Bearerl, Signaling radio 1) reconstruction and secure reactivation.
  • RRC Radio Resource Control
  • the cell selection process can be performed, and after selecting the appropriate cell, the RRC connection is sent.
  • a RRC Connection Reestablishment Request message is sent to the cell to initiate an RRC re-establishment procedure to continue the RRC connection.
  • the RRC connection re-establishment can only succeed if the relevant cell is ready, ie there is a valid UE context.
  • the activities of other RBs continue to be suspended, SRB1 is first reconstructed, and then other RBs are re-established. If the AS (Access Stratum) security is not activated, the UE will not initiate the process and will immediately enter the IDLE state.
  • the RRC re-establishment process is an air interface process and does not require the participation of the MME (Mobility Management Entity).
  • the UE uses the C-RNTI (Cell Radio Network Temporary Identifier), the physCelUd (physical cell identifier), and the source cell of the handover source cell in the RRC Connection Reestablishment Request.
  • C-RNTI Cell Radio Network Temporary Identifier
  • physCelUd physical cell identifier
  • the source eNB must bring these re-establishment preparation information to the target eNB in the handover preparation phase, so that the UE can successfully establish the target cell to be successful.
  • the re-establishment information of the handover target cell is used in the RRC Connection Reestablishment Request.
  • the target eNB During the non-contention handover between the eNBs, the target eNB enters the handover preparation phase after receiving the handover request from the source eNB, prepares the UE-related resources, allocates the dedicated preamble, and puts it into the RRC reconfiguration message carrying the mobility information. Then, the RRC reconfiguration message is sent to the source eNB in the handover response message, and then the UE reconfiguration timer is started, and the source eNB transparently transmits the RRC reconfiguration message to the UE. After receiving the handover command with the dedicated preamble, the UE initiates the non-contention random access to the target eNB by sending a random access request message (MSG1) carrying the dedicated preamble.
  • MSG1 random access request message
  • the target eNB detects the MSG1 carrying the dedicated preamble, the UE replies with a random access response message (MSG2), and the UE receives the MSG2, that is, the random access response, and considers that the handover is successful, and sends a handover to the target eNB.
  • RRC reconfiguration complete message MSG3 If the target eNB receives the UE re-establishment request before receiving the MSG3, it considers that it is a re-establishment of the handover failure, and uses the re-establishment information brought by the source cell to match the UE.
  • the target eNB After receiving the re-establishment request of the UE after receiving the MSG3, the target eNB considers that it is a re-establishment after the handover succeeds, and uses the re-establishment information generated by the handover target cell information to match the UE.
  • the MSG3 may not be able to reach the target eNB due to unstable radio signal quality. If it is a non-competitive handover, the UE receives the MSG2 and considers that the handover is successful. When the re-establishment is initiated due to the failure of the radio link, the information of the handover target cell is used to construct the re-establishment information in the RRC re-establishment request. However, the target eNB does not receive the MSG3, and considers that it is a re-establishment of the handover failure.
  • the re-establishment information of the source cell is prepared, and the re-establishment preparation information generated by the handover target cell information is not prepared, so the re-establishment information cannot be matched.
  • the re-establishment fails, and the UE drops the call.
  • the main technical problem to be solved by the present invention is to provide a method for handover of a user terminal across a base station and an LTE system, which can improve the success rate of re-establishment in the handover process and reduce the call drop rate of the user terminal.
  • the present invention provides a method for switching a user terminal across a base station, including the steps of:
  • the target eNB After receiving the handover request of the user terminal, the target eNB generates the target cell re-establishment information and saves the local information by using the handover target cell information.
  • the target eNB After receiving the re-establishment request of the user terminal, the target eNB determines that the cause value in the re-establishment request is not the handover failure, and uses the target cell re-establishment information to match the user terminal, and re-establishes the success.
  • the target eNB further includes step after saving the target cell re-establishment information.
  • the target eNB generates a reconfiguration message carrying the mobility information and sends the message to the source eNB.
  • the source eNB transparently transmits the message to the user terminal.
  • the method further includes the steps of:
  • the user terminal After receiving the reconfiguration message carrying the mobility information, the user terminal sends a random access request message carrying the dedicated preamble in the reconfiguration message to the target cell;
  • the target cell After receiving the random access request, the target cell uses the dedicated preamble to match the user terminal instance, and replies to the user terminal with a random access response message, where the random access response message carries the cell radio network temporary identifier corresponding to the instance;
  • the user terminal receives the random access response message, detects the corresponding temporary identifier of the cell radio network, and considers that the cell handover is successful.
  • the user terminal further includes the following steps after the handover is successful:
  • the user terminal sends a message carrying the user terminal identifier and the re-establishment cause value to the target cell, and triggers a re-establishment process of switching to the target cell.
  • the method further comprises the steps of:
  • the target eNB re-allocates the resource, generates a new security parameter, and sends the request message to the user terminal through the RRC connection re-establishment request message;
  • the user terminal configures the local resource according to the content in the RRC re-establishment message, activates the new security parameter, and then sends an RRC connection re-establishment complete message to the target eNB.
  • the target eNB generates the target cell re-establishment information by using the handover target cell information, which is specifically:
  • the target cell re-establishment information is generated according to the cell radio network temporary identifier of the target cell, the physical element identifier, and the shortMAC-I generated by the target cell information.
  • An LTE system including a source eNB, a target eNB, and a user terminal, after receiving the handover request of the user terminal, the target eNB generates target cell re-establishment information using the handover target cell information and saves the local; the target eNB receives After the re-establishment request of the user terminal, if it is determined that the cause value in the re-establishment request is not the handover failure, the target cell is used to re-establish the information. With the user terminal, the re-establishment is successful.
  • the re-configuration message carrying the mobility information is sent to the source eNB, and the source eNB transmits the re-allocation message to the user terminal after receiving the message.
  • the user terminal after receiving the reconfiguration message carrying the mobility information, the user terminal sends a random access request message carrying the dedicated preamble in the reconfiguration message to the target cell to initiate random access; the target cell receives the random access.
  • the dedicated preamble is matched to the user terminal instance, and the user terminal is replied to the random access response message, where the random access response message carries the cell radio network temporary identifier corresponding to the instance; the user terminal receives the random access.
  • the corresponding cell radio network temporary identifier is detected, and the cell handover is considered successful.
  • the user terminal sends a message carrying the user terminal identifier and the re-establishment cause value to the target cell, and triggers a re-establishment procedure of the handover to the target cell.
  • the target eNB re-allocates the resources, generates a new security parameter, and sends the RRC connection re-establishment request message to the user terminal.
  • the user terminal configures the local resource according to the content in the RRC re-establishment message, and activates.
  • the new security parameter then sends an RRC Connection Reestablishment Complete message to the target eNB.
  • the target eNB generates target cell re-establishment information according to the short cell-I generated by the cell radio network temporary identifier, the physical element identifier, and the target cell information of the target cell.
  • the target eNB saves two re-establishment preparation information in the handover preparation phase after receiving the handover request, and one of the source eNBs is in the prior art when the UE handover fails.
  • the re-establishment preparation information brought by the handover request, and the other is the target cell re-establishment information generated by the target eNB using the handover target cell information after the UE handover succeeds.
  • the target eNB uses the re-establishment preparation information brought in the handover request to match the UE instance, and the re-establishment succeeds; If the cause value is not a handover failure, such as a radio link failure, the re-establishment preparation information generated by the target eNB using the target cell information is matched to the UE instance, Established successfully.
  • the invention improves the success rate of re-establishment in the handover process, thereby reducing the call drop rate of the UE.
  • FIG. 1 is a flowchart of a handover method of a user terminal across a base station according to Embodiment 1 of the present invention
  • FIG. 2 is an interface relationship diagram of a user equipment, an evolved Node B, a mobility management entity, and a service gateway where X2 handover occurs;
  • FIG. 3 is a flowchart of a method for switching a user terminal to perform X2 handover across a base station according to Embodiment 2 of the present invention
  • 4 is an interface diagram of user equipment, evolved Node B, mobility management entity, and service gateway where S1 handover occurs;
  • FIG. 5 is a flowchart of a method for switching a user terminal to perform S1 handover across a base station according to Embodiment 3 of the present invention. detailed description
  • FIG. 1 is a flowchart of a method for switching a user terminal across a base station according to Embodiment 1 of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 1 - Step 3 The source eNB receives the measurement report of the UE, or triggers the handover due to the load balancing function, and sends a Handover Request message to the target eNB through the X2 port or the S1 port, where the handover includes but is not limited to mobility triggering. Switching.
  • the Handover Request message includes, but is not limited to, the RRC context of the UE, the UE capability, and the reconfiguration preparation information including the handover source cell information.
  • Step 4 - Step 5 After receiving the handover request, the target eNB saves the UE related context information. And the re-establishment preparation information brought by the source eNB, the allocated radio resource, the cell radio network temporary identifier (CRNTI), the dedicated preamble, etc., and the C-RNTL physical cell identifier (physCellld) and the target cell according to the cell radio network of the target cell.
  • the information generated short MAC-I generated target cell re-establishment information is stored locally, ensuring that the UE re-establishes to the handover target cell regardless of the handover success or failure, and the target eNB can match the UE instance.
  • Step 6 The target eNB sends a handover request acknowledgement (Handover Request Acknowledge) message to the source eNB through the X2 port or the S1 interface, where the retransmission message is included in the reconfiguration message, but is not limited to the target eNB.
  • CRNTI dedicated preamble
  • mobile information indicating UE access to the target cell.
  • Step 7 After receiving the handover request acknowledgement message, the source eNB transparently transmits the reconfiguration message to the UE.
  • Step 8 The UE receives the reconfiguration message carrying the mobile information, synchronizes to the target cell, and sends a random access message (MSG1) carrying the dedicated preamble in the reconfiguration message to the target cell to initiate random access.
  • MSG1 random access message
  • Step 9 The MAC layer of the target cell uses the dedicated preamble to match the UE instance after receiving the MSG1.
  • Step 10 The target cell replies to the UE with a random access response message (MSG2), and the MSG2 carries the CRNTI corresponding to the instance.
  • MSG2 random access response message
  • Step 11 The UE receives the MSG2 and detects the corresponding CRNTI, and considers that the handover is successful.
  • Step 12 The UE sends an RRC reconfiguration complete message (MSG3) failure or has not sent MSG3, or needs to initiate re-establishment to the handover target cell due to a radio link failure or the like.
  • MSG3 RRC reconfiguration complete message
  • Step 13 The UE sends an RRC Connection Reestablishment Request message to the target eNB.
  • the UE carries the user terminal identifier (UE-Identity) composed of the target cell information, and the re-establishment cause value is a radio link failure or other failure. .
  • Step 14 - Step 15 The target eNB receives the re-establishment request of the UE when waiting for the reconfiguration complete message of the UE, and checks whether the re-establishment cause value is not the handover failure, and then uses the target in the UE-Identity and the handover preparation phase.
  • the re-establishment preparation information generated by the cell information is matched and matched to After the UE instance, the related resources are re-allocated, new security parameters are generated, and the RRC Connection Reestablishment response message is brought to the UE.
  • Step 16 The UE receives the re-establishment response sent by the target eNB, configures the local resource according to the content in the message, activates the new security parameter, and sends an RRC Connection Reestablishment Complete message to the target eNB.
  • the target eNB receives the message, the re-establishment is successful, the re-establishment process is completed, and the radio link between the UE and the eNB is restored.
  • the UE when the UE considers that the handover is successful, and the target eNB considers the failure, the UE can successfully re-establish the establishment to the target eNB, so that the service of the UE is not interrupted.
  • Embodiment 2 The following describes the X2 interface switching and the S1 interface switching between the eNBs as an example. Embodiment 2
  • FIG. 2 is an interface relationship diagram of a user equipment, an evolved Node B, a mobility management entity, and a serving gateway where an X2 handover occurs.
  • a user equipment an evolved Node B
  • a mobility management entity a mobility management entity
  • a serving gateway where an X2 handover occurs.
  • FIG. 2 there is an X2 interface coupling between two eNBs, and a Uu exists between the UE and the eNB1 before handover.
  • the port is an air interface.
  • the UE disconnects from the Uu interface of the eNB1, and establishes a Uu interface with the eNB2.
  • FIG. 3 is a flowchart of a method for switching a user terminal to perform X2 handover across a base station according to Embodiment 2 of the present invention. As shown in FIG. 3, the handover process is as follows:
  • Step 301 The UE detects that the signal quality of a cell in the eNB2 is higher than a certain threshold of the signal quality of the serving cell, and reports a measurement report of the A3 event.
  • Step 302-step 303 The eNB1 determines that the UE needs to perform the X2 handover to the eNB2, and sends a handover request (Handover Request) message to the eNB2, where but not limited to the UE history information, the UE radio capability information, the UE service information, and the handover source cell.
  • the information and the re-establishment preparation information of the physical layer ID of the handover target cell are not limited to the UE history information, the UE radio capability information, the UE service information, and the handover source cell.
  • Step 306 Step 306: After receiving the handover request, the eNB2 saves the UE related information including but not limited to the handover source cell re-establishment information, allocates related resources, performs admission and local resource preparation, and further identifies the cell radio network temporary identifier according to the target cell. C-RNTI, physical cell identity The physCellld and the short cell-I target cell re-establishment information generated by the target cell information are stored locally, and then the eNB1 sends a Handover Request Acknowledge message, which carries information such as a reconfiguration message forwarded by the eNB1 to the UE.
  • the eNB2 After receiving the handover request, the eNB2 saves the UE related information including but not limited to the handover source cell re-establishment information, allocates related resources, performs admission and local resource preparation, and further identifies the cell radio network temporary identifier according to the target cell. C-RNTI, physical cell identity The physCelll
  • Step 307 After receiving the Handover Request Acknowledge message, the eNB1 transparently transmits the reconfiguration message to the UE.
  • the reconfiguration message is organized by the eNB2, and carries mobility information indicating that the UE switches to the target cell, a CRNTI allocated by the eNB2 to the UE, a dedicated preamble, a radio resource, and the like.
  • Step 308 The UE receives the reconfiguration message carrying the mobile information, synchronizes to the target cell, and sends the MSG1 carrying the dedicated preamble in the re-establishment message to the target cell to initiate random access.
  • Step 309 The MAC layer of the target cell uses the dedicated preamble to match the UE instance after receiving the MSG1.
  • Step 310 The target cell returns a random access response (MSG2) to the UE, and carries the CRNTL corresponding to the instance.
  • MSG2 random access response
  • Step 311 The UE receives the MSG2, detects the corresponding CRNTI, and considers that the handover is successful.
  • Step 312 The UE sends a reconfiguration complete message (MSG3) to the handover target cell, but the target cell does not receive the MSG3 because the uplink DCCH channel is abnormal.
  • MSG3 reconfiguration complete message
  • Step 313 The UE does not receive the response message of the MSG3, and repeatedly sends the MSG3. If the MSG3 sends the maximum number of times, the UE triggers the re-establishment process of the handover target cell, and sends an RRC Connection Reestablishment Request to the eNB2, which carries the UE-Identity, re-establishes the cause value, and the like. The UE carries the target cell information component because the UE considers that the handover is successful.
  • the UE-Identity, and the re-establishment cause value is a radio link failure.
  • Step 314-Step 315 The eNB2 receives the re-establishment request of the UE when waiting for the re-establishment completion message of the UE, and checks whether the re-establishment cause value is not the handover failure, and then uses the target cell in the UE-Identity and the handover preparation phase.
  • the re-establishment preparation information generated by the information is matched. After matching to the UE instance, the related resources are reallocated, and new security parameters are generated, and are brought to the UE by using an RRC Connection Reestablishment message.
  • Step 316 The UE receives the re-establishment response message sent by the eNB2, configures a local resource according to the content in the message, activates a new security parameter, and sends an RRC Connection Reestablishment Complete message to the eNB2.
  • the eNB2 receives the message, the re-establishment is successful, and the radio link between the UE and the eNB2 is restored.
  • the eNB2 re-establishes the X2 handover procedure after the UE resumes the DRB, and ensures that the UE's service is completely switched to the eNB2.
  • FIG. 4 is an interface relationship diagram of a user equipment, an evolved Node B, a mobility management entity, and a serving gateway where an S1 handover occurs.
  • a user equipment an evolved Node B
  • a mobility management entity a mobility management entity
  • a serving gateway where an S1 handover occurs.
  • FIG. 4 there is no X2 port coupling between two eNBs, and the UE and the eNB1 exist before handover.
  • the Uu interface that is, the air interface, is disconnected from the Uu interface of the UE and the eNB1 after the handover, and establishes a Uu interface with the eNB2.
  • FIG. 5 is a flowchart of a method for switching a user terminal to perform S1 handover across a base station according to Embodiment 3 of the present invention. As shown in FIG. 5, the handover process is as follows:
  • Step 501 The UE detects that the signal quality of a cell in the eNB2 is higher than a certain threshold of the signal quality of the serving cell, and reports a measurement report of the A3 event.
  • Step 502 Step 503: The eNB1 determines that the UE needs to perform the S1 handover to the eNB2, and sends a handover request (Handover Required) message to the MME, where the UE carries the source to target transparent container, and the handover source cell information and the handover target cell physical layer.
  • the re-establishment preparation information composed of the ID, the reason for the handover, and the like, and the data back-transmission path is indicated as an indirect back-transmission.
  • Step 504 After receiving the Handover Required message, the MME sends a Handover Request message to the eNB2, where the MME carries the Source to Target transparent container, the service information of the UE, and the like.
  • Step 505 Step 507: After receiving the handover request, the eNB2 saves the UE related information including but not limited to the handover source cell re-establishment information, allocates related resources, performs admission, and performs local resource preparation. And the short cell-I generated target cell re-establishment information generated by the short cell-I generated by the cell radio network temporary identifier C-RNTI, the physical cell identifier physCellld, and the target cell information of the target cell is stored locally, and then the Handover Request Acknowledge message is sent to the MME, where Information such as a handover command forwarded by the eNB1 to the UE.
  • the UE related information including but not limited to the handover source cell re-establishment information, allocates related resources, performs admission, and performs local resource preparation.
  • Step 508 The MME sends a handover command (Handover Command) message to the eNB1, where the eNB2 carries the radio related parameter of the eNB2, Target to Source transparent container.
  • Handover Command Handover Command
  • Step 509 After receiving the Handover Command, the eNB1 sends a handover command in the Target to Source transparent container, that is, a reconfiguration message carrying the mobility information to the UE.
  • Step 510 The UE receives the reconfiguration message carrying the mobile information, synchronizes to the target cell, and sends the MSG1 carrying the dedicated preamble in the reconfiguration message to the target cell to initiate random access.
  • Step 511 - Step 512 After receiving the MSG1, the MAC layer of the target cell uses the dedicated preamble to match the UE instance, and returns the UE to the MSG2, that is, the random access response, and carries the CRNTL corresponding to the instance.
  • Step 513 The UE receives the MSG2, detects the corresponding CRNTI, and considers that the handover is successful.
  • Step 514 - Step 515 The UE does not send the reconfiguration complete message MSG3 before the abnormality occurs, triggers the re-establishment process, and after cell selection, decides to re-establish the handover target cell, and sends an RRC Connection Reestablishment Request to the eNB2, where the UE-Identity is carried. Re-establish the cause value, etc.
  • the UE carries the UE-Identity composed of the target cell information, and the re-establishment cause value is other failures.
  • Steps 516-517 The eNB2 receives the re-establishment request of the UE when waiting for the reconfiguration complete message of the UE, and checks whether the re-establishment cause value is not the handover failure, and then uses the target cell information in the UE-Identity and the handover preparation phase.
  • the generated re-establishment preparation information is matched, and after matching to the UE instance, the related resources are reallocated, and new security parameters are generated, which are brought to the UE through the RRC Connection Reestablishment message.
  • Step 518 The UE receives the re-establishment response sent by the eNB2, according to the content in the message. Set the local resource, activate the new security parameters, and send an RRC Connection Reestablishment Complete message to eNB2.
  • the eNB2 receives the message, the re-establishment is successful, and the radio link between the UE and the eNB2 is restored.
  • the eNB2 re-establishes the S1 handover procedure after the UE resumes the DRB, and ensures that the UE's service is completely switched to the eNB2.
  • the UE when the UE considers that the handover is successful and the eNB2 considers the failure, the UE can successfully re-establish to the eNB2, so that the service of the UE is not interrupted.

Abstract

本发明公开了一种用户终端跨基站的切换方法，包括：目标eNB接收到用户终端的切换请求后，使用切换目标小区信息生成目标小区重建立信息并保存在本地；目标eNB接收到用户终端的重建立请求后，判断重建立请求中的原因值不为切换失败时，使用目标小区重建立信息匹配用户终端，重建立成功。本发明还相应地公开了一种LTE系统。本发明能够提高切换过程中重建立的成功率，从而降低了UE的掉话率。

Description

一种用户终端跨基站的切换方法和 LTE系统 技术领域
本发明涉及 LTE ( Long Term Evolution,长期演进）无线通信技术领域， 具体涉及一种用户终端跨基站的切换方法和 LTE系统。 背景技术
在 LTE系统中， 用户终端 （UE, User Equipment ) 的状态分为连接态 ( RRC_CONNECTED ) 和空 闲 态 （ RRC_IDLE ) 两种。 当 处于 RRC_CONNECTED状态下的 UE从服务小区移动到了另一个小区时，就会 触发越区切换（ Handover ) , 以保证业务的不中断。
从 UE驻留基站场景划分， 切换分为 eNB ( Evolved NodeB , 演进的节 点 B ) 内的切换和 eNB间的切换。 eNB内的切换是指切换的源小区和目标 小区位于同一个 eNB; eNB间的切换是指切换的源小区和目标小区位于不 同的 eNB。从是否需要通过 EPC ( Evolved Packet Core,演进的分组核心网） 参与完成切换的角度分， 或者从切换发生在 S1接口或 X2接口的角度分， eNB间的切换又分为 X2接口切换和 S1接口切换， 从 UE是否在目标小区 进行非竟争的随机接入分， 又分为竟争切换和非竟争切换。
由于在切换过程中 UE—般处于两个小区边缘并处于移动状态 ,无线信 号质量较弱且不稳定， 另外， 两个小区的信号还有可能相互干扰， 因此极 有可能会切换失败， 导致 UE掉话， 极大地影响系统性能。 为了减少 UE掉 话的可能性， LTE系统引入了一种技术： RRC ( Radio Resource Control , 无 线资源控制协议）重建立， 该技术的目的是重新建立 RRC连接， 其涉及到 SRBl ( Signalling Radio Bearerl , 信令无线 载 1 ) 的重建以及安全的重新 激活。 如果在 RRC连接态下且安全已经激活的 UE检测到无线链路失败， Network, 演进的通用陆基无线接入网） 系统移动失败， 或者收到底层的完 整性检查失败指示， 或重配置失败等， 则可以执行小区选择过程， 选择到 合适小区后通过发送 RRC 连接重建立请求 （ RRC Connection Reestablishment Request )消息给该小区发起 RRC重建立流程， 以继续 RRC 连接。 RRC 连接重建立只有在相关小区已经准备好， 即有一个有效的 UE 上下文时才能成功。 一旦 eNB接受了重建立， 其它 RB ( Radio Bearer, 无 线承载） 的活动继续暂停， SRB1先重建起来， 然后再重建其它 RB。 如果 AS ( Access Stratum, 接入层）安全没有被激活， UE不会发起该流程而会 立即进入到 IDLE (空闲） 态。 RRC重建立过程是空口过程， 不需要 MME ( Mobility Management Entity, 移动管理实体） 的参与。
当 UE 的重建立原因是切换失败时， UE 会在 RRC Connection Reestablishment Request中使用切换源小区的 C-RNTI ( Cell Radio Network Temporary Identifier , 小区无线网络临时标识 )、 physCelUd (物理小区标识 ) 以及源小区信息产生的 shortMAC-I等，因此在切换准备阶段源 eNB必须将 这些重建立准备信息带给目标 eNB, 以便 UE重建立到目标小区能成功。 当 UE 的重建立原因不是切换失败时， 则会在 RRC Connection Reestablishment Request中使用切换目标小区的重建立信息。
在 eNB间的非竟争切换过程中， 目标 eNB在收到源 eNB的切换请求 后进入切换准备阶段， 准备 UE相关资源， 分配专用前导， 并将其放入携带 移动性信息的 RRC重配消息中， 再将 RRC重配消息放入切换响应消息中 发给源 eNB, 然后启动 UE重配定时器， 源 eNB将透传该 RRC重配消息给 UE。 UE 收到带专用前导的切换命令后通过发送携带专用前导的随机接入 请求消息（ MSG1 ), 发起到目标 eNB的非竟争随机接入。 目标 eNB如果检 测到携带专用前导的 MSG1 , 则给 UE 回复随机接入响应消息 （MSG2 ), UE收到 MSG2即随机接入响应， 就认为切换成功， 给目标 eNB发送切换 的 RRC重配完成消息（ MSG3 )。 目标 eNB在收到 MSG3之前如果收到 UE 重建立请求， 则认为是切换失败的重建立， 会使用源小区带来的重建立信 息来匹配 UE。 目标 eNB收到 MSG3后再收到 UE的重建立请求， 则认为 是切换成功后的重建立， 使用切换目标小区信息生成的重建立信息来匹配 UE。
在发生切换的场景下， 由于无线信号质量不稳定， MSG3 有可能无法 到达目标 eNB。 如果是非竟争切换， UE收到 MSG2, 认为切换成功， 后续 因无线链路失败等发起重建立时， 在 RRC重建立请求中会使用切换目标小 区的信息来组建重建立信息。 但是目标 eNB由于没有接收到 MSG3 , 认为 是切换失败的重建立， 准备的是源小区的重建立信息， 而未准备切换目标 小区信息生成的重建立准备信息， 因此重建立信息匹配不上， 会导致重建 立失败， UE掉话。 发明内容
本发明要解决的主要技术问题是提供一种用户终端跨基站的切换方法 和 LTE系统， 能够提高切换过程中重建立的成功率， 降低用户终端的掉话 率。
为解决上述技术问题， 本发明提供一种用户终端跨基站的切换方法， 包括步骤：
目标 eNB接收到用户终端的切换请求后， 使用切换目标小区信息生成 目标小区重建立信息并保存在本地；
目标 eNB接收到用户终端的重建立请求后， 判断重建立请求中的原因 值不为切换失败时， 则使用目标小区重建立信息匹配用户终端， 重建立成 功。
一实施例中， 目标 eNB保存目标小区重建立信息之后还进一步包括步 目标 eNB生成携带有移动性信息的重配消息并发送给源 eNB , 源 eNB 收到后将该消息透传给用户终端。
一实施例中， 还进一步包括步骤：
用户终端收到携带有移动性信息的重配消息后， 给目标小区发送携带 重配消息中的专用前导的随机接入请求消息；
目标小区收到随机接入请求后使用其中的专用前导匹配到用户终端实 例， 给用户终端回复随机接入响应消息， 所述随机接入响应消息中携带该 实例对应的小区无线网络临时标识；
用户终端收到随机接入响应消息， 检测到对应的小区无线网络临时标 识， 认为小区切换成功。
一实施例中， 用户终端认为切换成功后还进一步包括步骤：
用户终端发送携带有用户终端标识和重建立原因值的消息给目标小 区， 触发切换到目标小区的重建立流程。
一实施例中， 重建立成功之后还进一步包括步骤：
目标 eNB重新分配资源，生成新的安全参数，通过 RRC连接重建立请 求消息发送给用户终端；
用户终端才艮据 RRC重建立消息中的内容， 配置本地资源， 激活新的安 全参数， 然后给目标 eNB发送 RRC连接重建立完成消息。
一实施例中， 目标 eNB使用切换目标小区信息生成目标小区重建立信 息具体为：
根据目标小区的小区无线网络临时标识、 物理元标识以及目标小区信 息产生的 shortMAC-I生成目标小区重建立信息。
一种 LTE系统， 包括源 eNB、 目标 eNB和用户终端， 所述目标 eNB 接收到用户终端的切换请求后， 使用切换目标小区信息生成目标小区重建 立信息并保存在本地； 所述目标 eNB接收到用户终端的重建立请求后， 判 断重建立请求中的原因值不为切换失败时， 则使用目标小区重建立信息匹 配用户终端， 重建立成功。
一实施例中， 目标 eNB保存目标小区重建立信息之后生成携带有移动 性信息的重配消息发送给源 eNB , 源 eNB收到后将该重配消息后透传给用 户终端。
一实施例中， 用户终端接收到携带有移动性信息的重配消息后， 给目 标小区发送携带重配消息中的专用前导的随机接入请求消息， 发起随机接 入； 目标小区收到随机接入请求后使用其中的专用前导匹配到用户终端实 例， 给用户终端回复随机接入响应消息， 所述随机接入响应消息中携带该 实例对应的小区无线网络临时标识； 用户终端收到随机接入响应消息， 检 测到对应的小区无线网络临时标识， 认为小区切换成功。
一实施例中， 用户终端发送携带有用户终端标识和重建立原因值的消 息给目标小区， 触发切换到目标小区的重建立流程。
一实施例中， 重建立成功之后， 目标 eNB重新分配资源， 生成新的安 全参数， 通过 RRC 连接重建立请求消息发送给用户终端； 用户终端根据 RRC重建立消息中的内容， 配置本地资源， 激活新的安全参数， 然后给目 标 eNB发送 RRC连接重建立完成消息。
一实施例中， 目标 eNB 才艮据目标小区的小区无线网络临时标识、 物理 元标识以及目标小区信息产生的 shortMAC-I生成目标小区重建立信息。
与现有技术相比， 本发明切换方法和 LTE系统中， 目标 eNB在收到切 换请求后的切换准备阶段保存两份重建立准备信息， 一份是现有技术中 UE 切换失败时，源 eNB通过切换请求带过来的重建立准备信息，另一份是 UE 切换成功后，目标 eNB使用切换目标小区信息生成的目标小区重建立信息。 当 UE发送重建立请求给目标 eNB时， 如果其中的重建立原因值为切换失 败，则目标 eNB使用切换请求中带过来的重建立准备信息匹配到 UE实例， 重建成功； 如果重建立请求中的原因值不为切换失败， 如无线链路失败等， 则目标 eNB使用目标小区信息生成的重建立准备信息匹配到 UE实例， 重 建立成功。本发明提高了切换过程中重建立的成功率，从而降低了 UE的掉 话率。 附图说明
图 1为本发明实施例一提供的一种用户终端跨基站的切换方法流程图； 图 2为发生 X2切换的用户设备、 演进的节点 B、 移动管理实体和服务 网关的接口关系图；
图 3为本发明实施例二提供的一种用户终端跨基站发生 X2切换的切换 方法流程图；
图 4为发生 S1切换的用户设备、 演进的节点 B、 移动管理实体和服务 网关的接口关系图；
图 5为本发明实施例三提供的一种用户终端跨基站发生 S1切换的切换 方法流程图。 具体实施方式
下面通过具体实施方式结合附图对本发明作进一步详细说明。 实施例一
图 1为本发明实施例一提供的一种用户终端跨基站的切换方法流程图， 如图 1所示， 该方法包括步骤：
步骤 1-步骤 3: 源 eNB收到 UE的测量报告， 或由于负荷均衡功能触 发切换， 通过 X2口或 S1口给目标 eNB发送切换请求（ Handover Request ) 消息， 该切换包括但不限于移动性触发的切换。 Handover Request消息中包 括但不限于 UE的 RRC上下文、 UE能力以及包含切换源小区信息的重建 立准备信息。
步骤 4-步骤 5: 目标 eNB收到切换请求后保存 UE相关上下文信息以 及源 eNB带过来的重建立准备信息， 分配无线资源、 小区无线网络临时标 识 （CRNTI )、 专用前导等， 并根据目标小区的小区无线网络临时标识 C-RNTL物理小区标识（ physCellld )以及目标小区信息产生的 shortMAC-I 生成目标小区重建立信息保存在本地，保证 UE不管切换成功或失败后重建 立到切换目标小区， 目标 eNB均能匹配到 UE实例。
步骤 6: 目标 eNB 通过 X2 口或 S1 口给源 eNB 回切换请求确认 ( Handover Request Acknowledge )消息， 其中携带由目标 eNB生成的重配 消息， 该重配消息中包含但不限于目标 eNB分配给 UE的 CRNTI、 专用前 导以及指示 UE接入到目标小区的移动信息等。
步骤 7: 源 eNB收到切换请求确认消息后将重配消息透传给 UE。
步骤 8: UE收到携带移动信息的重配消息， 同步到目标小区， 给目标 小区发送携带重配消息中的专用前导的随机接入消息 （MSG1 ), 发起随机 接入。
步骤 9: 目标小区的 MAC层收到 MSG1后使用其中的专用前导匹配到 UE实例。
步骤 10: 目标小区给 UE回复随机接入响应消息 （ MSG2 ), MSG2携 带该实例对应的 CRNTI。
步骤 11 : UE收到 MSG2, 检测到对应的 CRNTI, 认为切换成功。 步骤 12: UE发送 RRC重配完成消息（ MSG3 )失败或还未发送 MSG3 , 或由于无线链路失败等原因， 需要发起到切换目标小区的重建立。
步骤 13: UE给目标 eNB发送 RRC Connection Reestablishment Request 消息， 由于 UE认为切换成功，该消息中携带目标小区信息组成的用户终端 标识（ UE-Identity ), 重建立原因值为无线链路失败或其它失败。
步骤 14-步骤 15:目标 eNB在等待 UE的重配完成消息时收到 UE的重 建立请求，查看其中的重建立原因值不为切换失败，则将其中的 UE-Identity 与切换准备阶段使用目标小区信息生成的重建立准备信息相匹配， 匹配到 UE实例后， 重新分配相关资源， 生成新的安全参数， 通过 RRC连接重建 立 （ RRC Connection Reestablishment ) 响应消息带给 UE。
步骤 16: UE收到目标 eNB发送的重建立响应， 根据该消息中的内容 配置本地资源， 激活新的安全参数， 给目标 eNB发送 RRC 连接重建立完 成 ( RRC Connection Reestablishment Complete ) 消息。 目标 eNB收到该消 息， 重建立成功， 重建立过程完成， UE和 eNB之间的无线链路恢复。
经过上述步骤的处理， 当 UE认为切换成功， 而目标 eNB认为失败的 情况下， UE能够成功重建立到目标 eNB , 使 UE的业务不会被打断。
下面分 eNB间的 X2接口切换和 S1接口切换为例具体说明。 实施例二
图 2为发生 X2切换的用户设备、 演进的节点 B、 移动管理实体和服务 网关的接口关系图， 如图 2所示， 两个 eNB之间存在 X2口偶联， 切换前 UE与 eNBl存在 Uu口，即空口，切换后 UE与 eNBl的 Uu口断开，与 eNB2 建立起 Uu口。
图 3为本发明实施例二提供的一种用户终端跨基站发生 X2切换的切换 方法流程图， 如图 3所示， 该切换流程如下：
步骤 301 : UE检测到 eNB2中某小区的信号质量比服务小区的信号质 量高于一定的门限， 上报 A3事件的测量报告。
步骤 302-步骤 303 : eNBl判决 UE需要进行到 eNB2的 X2切换， 给 eNB2发送切换请求（ Handover Request )消息， 其中包含但不限于 UE历史 信息、 UE无线能力信息、 UE业务信息以及由切换源小区信息和切换目标 小区物理层 ID组成的重建立准备信息。
步骤 304-步骤 306: eNB2收到切换请求后保存包括但不限于切换源小 区重建立信息的 UE相关信息，分配相关资源，进行接纳以及本地资源准备， 并再根据目标小区的小区无线网络临时标识 C-RNTI、 物理小区标识 physCellld以及目标小区信息产生的 shortMAC-I成目标小区重建立信息保 存在本地，然后给 eNBl发送切换请求响应（ Handover Request Acknowledge ) 消息， 其中携带由 eNBl转发给 UE的重配消息等信息。
步骤 307: eNBl收到 Handover Request Acknowledge消息后将其中的 重配消息透传给 UE。 该重配消息由 eNB2组建， 其中携带指示 UE切换到 目标小区的移动性信息、 eNB2分配给该 UE的 CRNTI、 专用前导、 无线资 源等。
步骤 308: UE收到携带移动信息的重配消息， 同步到目标小区， 给目 标小区发送携带重建立消息中的专用前导的 MSG1 , 发起随机接入。
步骤 309: 目标小区的 MAC层收到 MSG1后使用其中的专用前导匹配 到 UE实例。
步骤 310: 目标小区给 UE回复随机接入响应 MSG2, 携带该实例对应 的 CRNTL
步骤 311 : UE收到 MSG2, 检测到对应的 CRNTI, 认为切换成功。 步骤 312: UE给切换目标小区发送重配完成消息（MSG3 ), 但是由于 上行 DCCH信道异常， 目标小区未收到 MSG3。
步骤 313: UE未收到 MSG3的响应消息， 重复发送 MSG3。 MSG3发 送超过最大次数， 则 UE触发到切换目标小区的重建立流程， 给 eNB2发送 RRC Connection Reestablishment Request, 其中携带 UE-Identity、 重建立原 因值等。 由于 UE 认为切换成功， 该消息中携带目标小区信息组成的
UE-Identity, 且重建立原因值为无线链路失败。
步骤 314-步骤 315: eNB2在等待 UE的重建立完成消息时收到 UE的 重建立请求， 查看其中的重建立原因值不为切换失败， 则将其中的 UE-Identity 与切换准备阶段使用目标小区信息生成的重建立准备信息相匹 配， 匹配到 UE实例后， 重新分配相关资源， 生成新的安全参数， 通过 RRC Connection Reestablishment消息带给 UE。 步骤 316: UE收到 eNB2发送的重建立响应消息， 根据该消息中的内 容配置本地资源， 激活新的安全参数， 给 eNB2 发送 RRC Connection Reestablishment Complete消息。 eNB2收到该消息，重建立成功， UE和 eNB2 之间的无线链路恢复。 eNB2重建立 UE恢复 DRB后继续未完成的 X2切换 流程， 保证 UE的业务完全切换到 eNB2。
经过上述步骤的处理， 当 UE认为切换成功， 而 eNB2认为失败的情况 下， UE能够成功重建立到 eNB2, 使 UE的业务不会被打断。 实施例三
图 4为发生 S1切换的用户设备、 演进的节点 B、 移动管理实体和服务 网关的接口关系图， 如图 4所示， 两个 eNB之间不存在 X2口偶联， 切换 前 UE与 eNBl存在 Uu口， 即空口， 切换后 UE与 eNBl的 Uu口断， 与 eNB2建立起 Uu口。
图 5为本发明实施例三提供的一种用户终端跨基站发生 S1切换的切换 方法流程图， 如图 5所示， 该切换流程如下：
步骤 501 : UE检测到 eNB2中某小区的信号质量比服务小区的信号质 量高于一定的门限， 上报 A3事件的测量报告。
步骤 502-步骤 503: eNBl判决 UE需要进行到 eNB2的 S1切换， 给 MME发送切换要求（ Handover Required ) 消息， 其中携带 Source to Target transparent container等信元， 由切换源小区信息和切换目标小区物理层 ID 组成的重建立准备信息， 切换原因等， 数据反传路径指示为间接反传。
步骤 504: MME收到 Handover Required消息后给 eNB2发送切换请求 ( Handover Request ) 消息, 其中携带 Source to Target transparent container、 UE的业务信息等。
步骤 505-步骤 507: eNB2收到切换请求后保存包括但不限于切换源小 区重建立信息的 UE相关信息，分配相关资源，进行接纳以及本地资源准备， 并再根据目标小区的小区无线网络临时标识 C-RNTI、 物理小区标识 physCellld以及目标小区信息产生的 shortMAC-I生成目标小区重建立信息 保存在本地，然后给 MME发送 Handover Request Acknowledge消息,其中携 带由 eNBl转发给 UE的切换命令等信息。
步骤 508: MME给 eNBl发送切换命令 ( Handover Command ) 消息， 其中携带 eNB2发送的 eNB2的无线相关参数 Target to Source transparent container„
步骤 509: eNBl 收到 Handover Command后， 将 Target to Source transparent container中的切换命令，即携带移动性信息的重配消息发给 UE。
步骤 510: UE收到携带移动信息的重配消息， 同步到目标小区， 给目 标小区发送携带重配消息中的专用前导的 MSG1 , 发起随机接入。
步骤 511-步骤 512: 目标小区的 MAC层收到 MSG1后使用其中的专用 前导匹配到 UE实例，给 UE回复 MSG2即随机接入响应，携带该实例对应 的 CRNTL
步骤 513: UE收到 MSG2, 检测到对应的 CRNTI, 认为切换成功。 步骤 514-步骤 515: UE还未发送重配完成消息 MSG3之前出现异常， 触发重建立流程， 经过小区选择， 决定重建立到切换目标小区， 给 eNB2 发送 RRC Connection Reestablishment Request , 其中携带 UE-Identity、 重建 立原因值等。 由于 UE认为切换成功， 该消息中携带目标小区信息组成的 UE-Identity, 且重建立原因值为其它失败。
步骤 516-517: eNB2在等待 UE的重配完成消息时收到 UE的重建立请 求， 查看其中的重建立原因值不为切换失败， 则将其中的 UE-Identity与切 换准备阶段使用目标小区信息生成的重建立准备信息相匹配， 匹配到 UE 实例后， 重新分配相关资源， 生成新的安全参数， 通过 RRC Connection Reestablishment消息带给 UE。
步骤 518: UE收到 eNB2发送的重建立响应， 根据该消息中的内容配 置本地资源 , 激活新的安全参数， 给 eNB2 发送 RRC Connection Reestablishment Complete消息。 eNB2收到该消息，重建立成功， UE和 eNB2 之间的无线链路恢复。 eNB2重建立 UE恢复 DRB后继续未完成的 S1切换 流程， 保证 UE的业务完全切换到 eNB2。
经过上述步骤的处理， 当 UE认为切换成功， 而 eNB2认为失败的情况 下， UE能够成功重建立到 eNB2, 使 UE的业务不会被打断。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单 推演或替换， 都应当视为属于本发明的保护范围。

Claims

权利要求书
1、 一种用户终端跨基站的切换方法， 其特征在于， 该方法包括： 目标 eNB接收到用户终端的切换请求后， 使用切换目标小区信息生成 目标小区重建立信息并保存在本地；
目标 eNB接收到用户终端的重建立请求后，判断重建立请求中的原因值 不为切换失败时， 使用目标小区重建立信息匹配用户终端， 重建立成功。
2、 如权利要求 1所述的切换方法， 其特征在于， 所述目标 eNB保存目 标小区重建立信息之后， 该方法还包括：
目标 eNB生成携带有移动性信息的重配消息并发送给源 eNB , 源 eNB 收到后将该消息透传给用户终端。
3、 如权利要求 2所述的切换方法， 其特征在于， 该方法还包括： 用户终端收到携带有移动性信息的重配消息后， 给目标小区发送携带 重配消息中的专用前导的随机接入请求消息；
目标小区收到随机接入请求消息后使用其中的专用前导匹配到用户终 端实例， 给用户终端回复随机接入响应消息， 所述随机接入响应消息中携 带该实例对应的小区无线网络临时标识；
用户终端收到随机接入响应消息， 检测到对应的小区无线网络临时标 识， 认为小区切换成功。
4、 如权利要求 3所述的切换方法， 其特征在于， 所述用户终端认为切 换成功后， 该方法还包括：
用户终端发送携带有用户终端标识和重建立原因值的消息给目标小 区， 触发切换到目标小区的重建立流程。
5、 如权利要求 1至 4任一项所述的切换方法， 其特征在于， 所述重建 立成功之后， 该方法还包括：
目标 eNB重新分配资源，生成新的安全参数，通过 RRC连接重建立消 息发送给用户终端；
用户终端根据所述 RRC连接重建立消息中的内容， 配置本地资源， 激 活新的安全参数， 然后给目标 eNB发送 RRC连接重建立完成消息。
6、 如权利要求 1至 4任一项所述的切换方法， 其特征在于， 所述目标 eNB使用切换目标小区信息生成目标小区重建立信息具体为：
根据目标小区的小区无线网络临时标识、 物理小区标识以及目标小区 信息产生的 shortMAC-I生成目标小区重建立信息。
7、 一种 LTE系统， 包括源 eNB、 目标 eNB和用户终端， 其特征在于， 所述目标 eNB, 用于在接收到用户终端的切换请求后， 使用切换目标 小区信息生成目标小区重建立信息并保存在本地； 以及在接收到用户终端 的重建立请求后， 判断重建立请求中的原因值不为切换失败时， 使用目标 小区重建立信息匹配用户终端， 重建立成功。
8、 如权利要求 7所述的 LTE系统， 其特征在于，
所述目标 eNB, 还用于在保存目标小区重建立信息之后生成携带有移 动性信息的重配消息发送给源 eNB,
所述源 eNB , 用于在收到重配消息后将该重配消息透传给用户终端。
9、 如权利要求 8所述的 LTE系统， 其特征在于，
所述用户终端， 用于在接收到携带有移动性信息的重配消息后， 给目 标小区发送携带重配消息中的专用前导的随机接入请求消息， 发起随机接 入； 目标小区收到随机接入请求消息后使用其中的专用前导匹配到用户终 端实例， 给用户终端回复随机接入响应消息， 所述随机接入响应消息中携 带该实例对应的小区无线网络临时标识； 用户终端收到随机接入响应消息， 检测到对应的小区无线网络临时标识， 认为小区切换成功。
10、 如权利要求 9所述的 LTE系统， 其特征在于，
所述用户终端， 还用于发送携带有用户终端标识和重建立原因值的消 息给目标小区， 触发切换到目标小区的重建立流程。
11、 如权利要求 7至 10任一项所述的 LTE系统， 其特征在于， 所述目标 eNB, 还用于在重建立成功之后， 重新分配资源， 生成新的 安全参数， 通过 RRC连接重建立消息发送给用户终端；
所述用户终端， 还用于根据所述 RRC重建立消息中的内容， 配置本地 资源，激活新的安全参数，然后给目标 eNB发送 RRC连接重建立完成消息。
12、 如权利要求 7至 10任一项所述的 LTE系统， 其特征在于， 所述目标 eNB 使用切换目标小区信息生成目标小区重建立信息具体 为： 根据目标小区的小区无线网络临时标识、 物理小区标识以及目标小区 信息产生的 shortMAC-I生成目标小区重建立信息。
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