WO2010009672A1 - 用户设备切换时获取承载状况的方法和移动管理实体 - Google Patents

用户设备切换时获取承载状况的方法和移动管理实体 Download PDF

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Publication number
WO2010009672A1
WO2010009672A1 PCT/CN2009/072872 CN2009072872W WO2010009672A1 WO 2010009672 A1 WO2010009672 A1 WO 2010009672A1 CN 2009072872 W CN2009072872 W CN 2009072872W WO 2010009672 A1 WO2010009672 A1 WO 2010009672A1
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WIPO (PCT)
Prior art keywords
base station
target base
bearer
mme
ambr
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PCT/CN2009/072872
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English (en)
French (fr)
Inventor
张娟
胡海静
姜怡华
汪颖
Original Assignee
大唐移动通信设备有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大唐移动通信设备有限公司 filed Critical 大唐移动通信设备有限公司
Priority to KR1020117003133A priority Critical patent/KR101206845B1/ko
Priority to EP09799987.4A priority patent/EP2306772B1/en
Priority to JP2011519017A priority patent/JP5185440B2/ja
Priority to MX2011000905A priority patent/MX2011000905A/es
Publication of WO2010009672A1 publication Critical patent/WO2010009672A1/zh
Priority to US13/012,121 priority patent/US8514813B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to acquiring when a user equipment is switched.
  • MME Mobile Management Entity
  • the Access Point Name-Aggregate Maximum Bit Rate is defined for all non-guaranteed bit rate (non-GBR) bearers.
  • UE-AMBR user equipment maximum aggregate bit rate
  • the APN-AMBR is stored as the subscription information in the Home Subscriber Service (HSS), which limits the maximum number of non-GBR bearers that the UE can connect to at the same access point name ( ⁇ , Access Point Name). Transmit aggregate bit rate. Services outside the restricted range will be discarded. If no other non-GBR bearer has no service transmission, any non-GBR bearer can occupy all APN-AMBR resources.
  • HSS Home Subscriber Service
  • the packet data network gateway (PDN GW, Packet Data Network Gateway) and the UE need to save the value of the APN-AMBR.
  • PDN GW Packet Data Network Gateway
  • the PDN GW and the UE must both have 7 Carry rate shaping.
  • a contracted UE-AMBR is also stored in the HSS.
  • the UE-AMBR limits the maximum transmission aggregate bit rate that the network can provide for all non-GBR bearers of a UE. Businesses outside the limits will be discarded. If no other non-GBR bearer has no service transmission, any non-GBR bearer can occupy all UE-AMBR resources.
  • DL and UL bearer UE-AMBR based rate control nodes are located at the base station (eNB), thus the eNB Need to save the UE-AMBR.
  • the value used by the eNB for actual scheduling is dynamically provided by the MME.
  • the MME compares the sum of the APN-AMBRs of all activated APNs with the subscribed UE-AMBRs, and takes the smaller value as the used UE-AMBR to the eNB.
  • the MME may not change (X2 handover) or may change (S1 handover).
  • the UE-AMBR is sent to the target eNB in the handover preparation phase, and is transmitted by the source eNB to the target eNB in the X2 handover, and is sent by the target MME to the target eNB in the SI handover.
  • the UE-AMBR value sent during the handover preparation process is a UE-AMBR value generated according to the bearer connection status established by the UE and the source eNB. However, when the handover is performed, the target eNB may only accept part of the bearer when making the reserved resource.
  • the part of the bearer that does not reserve the resource will not be established on the target side when the handover process is performed, and the bearer connection status between the UE and the target side. May change. If the target eNB still uses the same UE-AMBR as the source side for scheduling, it is obviously not accurate enough to affect the transmission performance of the network. Summary of the invention
  • the object of the present invention is to provide a method for acquiring a bearer status and a mobility management entity when the user equipment is switched, so that the target side can obtain the actually accepted bearer status, so that the target side can perform resource scheduling according to the actual connection status.
  • the embodiment of the invention discloses a method for obtaining a bearer status when a user equipment switches, which includes the following steps:
  • the target base station When the user equipment is switched, the target base station performs an admission decision on the UE according to the received bearer information of the user equipment UE, determines the accepted bearer, and notifies the mobile management entity MME of the accepted bearer;
  • the MME updates the UE-AMBR used by the target base station according to the received bearer received by the target base station.
  • An embodiment of the present invention further discloses an MME, including: a receiving module, configured to receive a bearer identifier that is allowed to be received from the target base station, and an update module, configured to update, according to the bearer identifier that is received by the receiving module, the UE-AMBR to be used by the target base station;
  • a notification module configured to notify the target base station of the updated UE-AMBR obtained by the update module.
  • the MME can obtain the UE-AMBR corresponding to the bearer connection situation of the target base station after the handover according to the bearer information received by the target base station, and then update the UE of the target base station according to the UE-AMBR.
  • the AMBR enables the target base station to perform resource scheduling according to the UE-AMBR representing the actual bearer connection condition.
  • FIG. 1 is a flowchart of a process of updating a UE-AMBR during X2 handover according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a process of updating a UE-AMBR during S1 handover according to Embodiment 2 of the present invention
  • Flow chart of UE-AMBR update
  • FIG. 4 is a block diagram of a module of an MME according to an embodiment of the present invention. Mode for carrying out the invention
  • the MME obtains the information about the bearer that is allowed to be received in the target eNB, and the MME may update the UE-AMBR used by the target eNB according to the information.
  • the MME may determine that when connecting with the source eNB. Is all APN activated?
  • the bearer connection is maintained with the target eNB, and then it is determined whether the UE-AMBR used in the target eNB needs to be modified. If only some bearers are accepted, the UE-AMBR needs to be changed. Of course, the judgment can also be omitted, and the UE-AMBR is directly updated according to the bearer received by the target eNB.
  • the timing and manner in which the MME knows the bearer information allowed to be admitted in the target eNB may be different.
  • the present invention will be further described in detail below in conjunction with the specific embodiments.
  • Embodiment 1 The UE-AMBR is updated at the time of X2 handover.
  • Step 100 The source eNB acquires the handover area restriction information of the UE from the MME by using an attach or tracking area update (TAU) process, and saves the information in the UE context message of the eNB.
  • TAU tracking area update
  • Step 101 The source eNB configures a measurement process of the UE according to the area restriction information.
  • Step 102 The UE triggers an uplink measurement report.
  • Step 103 The source eNB performs a handover decision according to the measurement information reported by the UE and the radio resource management (RRM) algorithm.
  • RRM radio resource management
  • Step 104 The source eNB sends a handover request message to the target eNB, requesting the target eNB to reserve resources for the UE, and transmitting the UE context information saved in the source eNB to the target eNB.
  • the handover request message includes an X2 signaling connection identifier, a target cell identifier, a bearer information of the UE in the source eNB, an RRM context, and a handover area restriction message and a UE history information.
  • the specific functions of the respective contents are well known in the art and will not be described again.
  • Step 105 The target eNB performs an admission decision on the UE according to the received bearer information of the UE, and determines the accepted bearer.
  • Step 106 The target eNB returns a handover request acknowledgement message after reserving resources for the UE, where It includes bearer information that allows handover, and a tunnel endpoint identifier (TEID) that is assigned for data forwarding.
  • TEID tunnel endpoint identifier
  • Tunnel Endpoint Identity information that needs to be delivered by the source eNB to the UE.
  • Step 107 The source eNB sends a handover command message to the UE.
  • Step 108 The source eNB sends a sequence number (SN) status transfer message to the target eNB, and is used to indicate to the target eNB the receiving status of the uplink data and the sending status of the downlink data in the source eNB.
  • SN sequence number
  • Step 109 After receiving the handover command, the UE disconnects the source eNB and performs an uplink synchronization process with the target eNB.
  • Step 110 The target eNB returns an uplink resource allocation and a timing advance to the UE.
  • Step 111 After completing the synchronization with the target cell, the UE sends a handover confirmation message to the target eNB.
  • Step 112 After the handover is completed, the target eNB sends a path switch request message to the MME, where the message includes the bearer identifier successfully received by the target eNB during the handover process. For bearers not included in this message, it means that these bearers are implicitly released by the target eNB.
  • Step 113 to step 115 The MME sends a user plane update request to the serving gateway, and the service gateway performs the update of the user downlink path, and returns a user plane update response to the MME.
  • the MME determines, according to the bearer identifier included in the path switch message, whether all APNs activated when connecting with the source eNB have a bearer connection with the target eNB after the handover, and if so, The UE-AMBR needs to be modified. Otherwise, the UE-AMBR used in the target eNB is modified according to the bearer connection situation of the target eNB after handover.
  • Step 116 The MME sends a path switch response to the target eNB, where the path switch response carries the updated UE-AMBR value. After receiving the UE-AMBR, the target eNB will schedule resources according to the new value of non-GBR until the next updated UE-AMBR value is received.
  • Step 117 to step 118 After completing the path update, the target eNB notifies the source eNB to release The UE context on the source side and the resources allocated to the UE.
  • the MME carries the updated UE-AMBR in the existing path switching response.
  • the MME may also notify the target eNB of the updated UE-AMBR through dedicated signaling.
  • the MME may trigger a system architecture evolution (SAE) bearer modification process, and the updated UE-AMBR value is carried in the SAE bearer modification request to notify the target eNB; or, the MME may also The updated UE-AMBR is carried in the UE context modification request to notify the target eNB.
  • SAE system architecture evolution
  • the dedicated signaling procedure and the piggybacking process are mutually juxtaposed. If the MME notifies the target eNB by using the dedicated SAE bearer modification procedure or the UE context modification procedure, the updated UE-AMBR value is not required in the path switching response of step 116.
  • Embodiment 2 UE-AMBR update process at S1 handover.
  • the MME is switched, that is, the source MME is switched to the target MME.
  • the processing flow is as shown in Figure 2, and includes the following steps:
  • Step 201 to step 203 The source eNB decides to initiate the handover process. First, the source eNB determines whether the handover can be completed through the X2 interface. If not, the handover request is sent to the source MME to initiate an handover process based on the S1 interface. The source MME selects the target MME, and sends the mobility management entity UE context including the PDN gateway and the serving gateway related bearer information as a forward relocation request to the target MME. The target MME learns from the received forward relocation request all APNs activated when the UE is connected to the source eNB.
  • Step 204 When the step is only used for the re-location of the serving gateway, the target MME selects a target serving gateway, and establishes a user plane for all bearers transmitted to the target MME.
  • step 204a the target MME sends a setup bearer request to the target serving gateway, and then step 204b, the target serving gateway returns a setup 7-load response to the target MME. If the same service gateway is shared with the switch before the switch, step 204 can be omitted.
  • Step 205 The target MME requires the target eNB to establish a UE context, including the requirement. Established information about the bearer.
  • the step 205a is that the target MME sends a handover request to the target eNB, where the handover request includes the bearer information that needs to be established.
  • Step 205b After the target eNB performs the bearer admission decision, it returns a handover response to the target MME, where the handover response includes the bearer identifier that the target eNB is allowed to accept.
  • the target MME knows the bearer identity allowed in the target eNB. After the step, the target MME determines, according to the received bearer identifier in the target eNB, whether all APNs activated when the UE is connected to the source eNB have a bearer connection with the target eNB after the handover, and if so, The UE-AMBR needs to be modified. Otherwise, the UE-AMBR used in the target eNB is modified according to the bearer connection status of the target eNB after the handover, and the SAE bearer modification process or the UE context modification process is triggered, and the updated UE-AMBR is transmitted through dedicated signaling. The value informs the target eNB. After receiving the dedicated signaling, the target eNB will use the new UE-AMBR value for resource scheduling until the next updated UE-AMBR value is received.
  • Step 206 When direct forward rotation is adopted, the target MME establishes a forward parameter configuration at the target S-GW.
  • Step 207 Response to the forward relocation request; if the application is not directly forwarded, the step also transmits the address information of the forwarding channel.
  • Step 208 For indirect forwarding, the TEID used by the target serving gateway for forwarding is forwarded to the source serving gateway.
  • Step 209 In addition to notifying the source eNB that the handover is ready, the UE may be notified to perform the handover, and further carries the data forwarding tunnel address parameter to complete the establishment of the forwarding channel.
  • the source eNB informs the UE in step 210 that the access network can be changed.
  • Steps 211a and 211b represent forward data paths for direct forward and indirect forward, respectively.
  • Step 214 The target MME notifies the source MME that the UE has successfully accessed the target system. A timer is started in the source MME to monitor when resources in the source system are released.
  • Steps 215 to 217 The target MME sends the tunnel address information allocated by the target eNB to the S-GW, and establishes a downlink transmission channel between the UE and the PDN-GW. If the S-GW is relocated, step 16 is used to update the bearer between the S-GW and the PDN-GW.
  • the UE may initiate a TAU process to update the location information in the HSS. This process is not related to the technical solution of the present invention, and therefore will not be described again.
  • the UE-AMBR update scheme proposed by the present invention includes the basic steps as shown in FIG. 3: Step 301: During UE handover The target eNB performs an admission decision on the UE according to the received bearer information of the UE, and determines the accepted bearer.
  • Step 302 The target eNB notifies the MME of the accepted payload.
  • Step 303 The MME determines, according to the received bearer received by the target eNB, whether all APNs activated when connecting with the source eNB maintain a bearer connection with the target eNB after the handover. If yes, the UE-AMBR does not need to be modified. Otherwise, the MME does not need to modify the UE-AMBR. And calculating, according to the bearer connection situation of the target eNB after handover, the UE-AMBR used in the target eNB.
  • Step 304 The MME notifies the target eNB of the updated UE-AMBR value.
  • the third embodiment of the present invention provides an MME, where the MME can be used to implement UE-AMBR update during UE handover.
  • the block diagram of the MME is shown in Figure 4, and the modules not related to the solution of the present invention are not shown in Figure 4.
  • the MME includes: The receiving module 401 is configured to receive the bearer identifier that is allowed to be received from the target base station, and the update module 402 is configured to update, according to the bearer identifier that is received by the receiving module 401, the UE-AMBR to be used by the target base station;
  • the notification module 403 is configured to notify the target base station of the updated UE-AMBR obtained by the update module 402.
  • the update module 402 includes:
  • the determining unit 404 is configured to determine, according to the bearer identifier that is allowed to be received, whether all APNs activated when connecting with the source eNB maintain a bearer connection with the target eNB after the handover, and if not, issue an indication signal;
  • the calculating unit 405 is configured to: after receiving the indication signal of the determining unit 404, calculate the UE-AMBR used in the target base station according to the bearer connection situation of the target eNB after the handover, and obtain the updated UE-AMBR.

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Description

用户设备切换时获取承载状况的方法和移动管理实体 技术领域
本发明涉及移动通信技术领域， 特别涉及一种用户设备切换时获取
7 载状况的方法和移动管理实体 ( MME, Mobile Management Entity ) 。 发明背景
在长期演进项目 （LTE, Long Term Evolution ) 系统中， 针对所有 的非保证比特率 （non-GBR ) 承载定义了接入节点最大聚合比特率 ( APN-AMBR, Access Point Name-Aggregate Maximum Bit Rate )和用 户设备最大聚合比特率（UE-AMBR )两个参数。 APN-AMBR作为签约 信息保存在归属用户服务器（ HSS, Home Subscriber Service ) 中， 限制 了 UE连接在同一个接入点名称 （ΑΡΝ, Access Point Name ) 的所有 non-GBR承载， 网络可以提供的最大传输聚合比特速率。 超过限制范围 以外的业务将会被丟弃。如果其它的 non-GBR承载没有业务传输，任何 一条 non-GBR承载都可以占用全部的 APN-AMBR资源。分组数据网络 网关（ PDN GW , Packet Data Network Gateway )和 UE都需要保存 APN-AMBR的值， 对于上行（UL, Uplink )和下行（ DL, Downlink ) 的业务， PDN GW和 UE都要对其 7 载进行速率整形。
HSS中还保存了一个签约的 UE-AMBR。 UE-AMBR限制了一个 UE 的所有 non-GBR承载， 网络可以提供的最大传输聚合比特速率。超过限 制范围以外的业务将会被丟弃。 如果其它的 non-GBR承载没有业务传 输， 任何一条 non-GBR承载都可以占用全部的 UE-AMBR资源。 DL和 UL承载基于 UE-AMBR的速率控制节点位于基站（ eNB ) ， 因此 eNB 需要保存 UE-AMBR。 eNB实际调度使用的值则是由 MME动态提供的。 由 MME 比较所有被激活的 APN 的 APN-AMBR 之和与签约的 UE-AMBR, 取较小值作为使用的 UE-AMBR传递给 eNB。
UE在不同的 eNB之间切换时， MME可能不发生改变（ X2切换 ) 也可能发生改变（ S 1切换）。 在切换准备阶段会将 UE-AMBR发送给目 标 eNB , X2切换时由源 eNB发送给目标 eNB , SI切换时由目标 MME 发送给目标 eNB。 在切换准备过程中发送的 UE-AMBR值都是根据 UE 与源 eNB建立的承载连接状况而生成的 UE-AMBR值。 但是在切换时， 目标 eNB在做预留资源时可能只会接纳部分承载，没有预留资源的那部 分承载在切换过程执行时将不会在目标侧建立， 则 UE与目标侧的承载 连接状况可能发生改变。 如果目标 eNB 仍然使用与源侧相同的 UE-AMBR进行调度显然不够准确， 从而影响网络的传输性能。 发明内容
有鉴于此， 本发明的目的在于， 提出一种用户设备切换时获取承载 状况的方法和移动管理实体， 可以使目标侧得到实际接纳的承载状况， 使得目标侧能够根据实际连接状况进行资源调度。
本发明实施例公开了一种用户设备切换时获取承载状况的方法， 包 括如下步骤：
在用户设备切换时， 目标基站根据接收到的用户设备 UE的承载信 息对 UE进行接纳判决， 确定接纳的承载， 并将所接纳的承载通知移动 管理实体 MME;
MME 根据所收到的目标基站接纳的承载， 对目标基站使用的 UE-AMBR进行更新。
本发明实施例还公开了一种 MME, 包括： 接收模块， 用于接收来自目标基站的允许接纳的承载标识； 更新模块， 用于根据所述接收模块收到的允许接纳的承载标识更新 目标基站所要使用的 UE-AMBR;
通知模块， 用于将所述更新模块得到的更新后的 UE-AMBR通知目 标基站。
从以上技术方案可以看出， 在切换过程中 MME根据所得目标基站 接纳的承载信息， 可以得到切换后目标基站的承载连接情况对应的 UE-AMBR, 再根据该 UE-AMBR更新目标基站的 UE-AMBR, 从而使 目标基站能够根据代表实际承载连接情况的 UE-AMBR 来进行资源调 度。 附图简要说明
下面将通过参照附图详细描述本发明的示例性实施例， 使本领域的 普通技术人员更清楚本发明的上述及其它特征和优点， 附图中：
图 1为本发明实施例一在 X2切换时更新 UE-AMBR的处理流程图； 图 2为本发明实施例二在 S1切换时更新 UE-AMBR的处理流程图； 图 3为本发明实施例实现 UE-AMBR更新的流程图；
图 4为本发明实施例提出的 MME的模块框图。 实施本发明的方式
为使本发明的目的、 技术方案及优点更加清楚明白， 以下参照附图 并举实施例， 对本发明作进一步地详细说明。
在用户设备切换的过程中， MME会得到目标 eNB中允许接纳的承 载的信息， MME可以根据该信息对目标 eNB使用的 UE-AMBR进行更 新， 较佳的做法可以是判断在与源 eNB连接时激活的所有 APN是否在 切换后与目标 eNB 都有承载连接保持， 进而再判断是否需要修改目标 eNB中使用的 UE-AMBR,如果只有部分承载被接纳则需要对 UE-AMBR 进行改变。 当然也可以省去该判断， 直接根据目标 eNB接纳的承载更新 UE-AMBR。
对于不同的切换过程， MME得知目标 eNB中允许接纳的承载的信 息的时机和方式会有所不同。 为使本发明的目的、 技术方案和优点更加 清楚， 下面结合具体实施例对本发明作进一步的详细阐述。
实施例一： 在 X2切换时更新 UE-AMBR。
X2切换时 MME保持不变，处理流程如图 1所示，具体包括如下步 骤：
步骤 100: 通过附着（ attach )或者跟踪区更新 ( TAU )过程， 源 eNB 从 MME中获取 UE的切换区域限制信息， 并保存在 eNB的 UE上下文 消息中。
步骤 101: 源 eNB根据区域限制信息配置 UE的测量过程。
步骤 102: UE触发上行测量报告。
步骤 103:源 eNB根据 UE上报的测量信息和无线资源管理（ RRM, Radio resource management ) 算法执行切换判决。
步骤 104: 源 eNB向目标 eNB发送切换请求消息， 要求目标 eNB 为 UE预留资源，并将源 eNB中保存的 UE上下文信息传递到目标 eNB。
切换请求消息中包括 X2信令连接标识， 目标小区标识， 源 eNB中 UE的承载信息， RRM上下文， 以及切换区域限制消息和 UE历史信息 等内容。 各内容的具体功能为本领域公知， 不再赘述。
步骤 105: 目标 eNB根据收到的 UE的承载信息对 UE进行接纳判 决， 确定接纳的承载。
步骤 106: 目标 eNB为 UE预留资源后返回切换请求确认消息， 其 中包括允许切换的承载信息， 为数据前转分配的隧道端点标识（TEID ,
Tunnel Endpoint Identity )地址， 以及需要由源 eNB传递给 UE的信息。
步骤 107: 源 eNB向 UE发送切换命令消息。
步骤 108:源 eNB向目标 eNB发送序列号（ SN, sequence of number ) 状态传递消息， 用于向目标 eNB指示在源 eNB中上行数据的接收状态 和下行数据的发送状态。
步骤 109: UE收到切换命令后断开与源 eNB的连接， 并执行与目 标 eNB的上行同步过程。
步骤 110: 目标 eNB向 UE返回上行资源分配和时间提前量。
步骤 111: UE完成与目标小区的同步后， 向目标 eNB发送切换确 认消息。
步骤 112:切换完成后， 目标 eNB向 MME发送路径切换请求（ path switch ) 消息， 该消息中包含在切换过程中成功在目标 eNB接纳的承载 标识。 对于没有包含在这条消息中的承载， 则表示这些承载被目标 eNB 隐示释放。
步骤 113至步骤 115: MME向服务网关发送用户平面更新请求，服 务网关进行用户下行路径的更新， 并向 MME返回用户平面更新响应。
与此同时， MME 收到路径切换消息后， 根据路径切换消息中包含 的承载标识来判断在与源 eNB连接时激活的所有 APN是否在切换后与 目标 eNB都有承载连接保持， 若是， 则不需修改 UE-AMBR, 否则， 根 据切换后目标 eNB的承载连接情况修改目标 eNB中使用的 UE-AMBR。
步骤 116: MME向目标 eNB发送路径切换响应， 该路径切换响应 中携带更新后的 UE-AMBR值。 目标 eNB收到 UE-AMBR后将按照新 的值为 non-GBR 载调度资源， 直到收到下一个更新的 UE-AMBR值。
步骤 117至步骤 118: 完成路径更新后， 目标 eNB通知源 eNB释放 源侧的 UE上下文和分配给 UE的资源。
在上述步骤 116中， MME将更新后的 UE-AMBR携带在现有的路 径切换响应中。此外， MME还可以通过专用信令将更新后的 UE-AMBR 通知目标 eNB。 例如， MME收到路径切换消息后就可以触发系统架构 演进（SAE, System Architecture Evolution )承载修改过程， 将更新后的 UE-AMBR值携带在 SAE承载修改请求中通知目标 eNB; 或者， MME 还可以将更新后的 UE-AMBR携带在 UE上下文修改请求中通知目标 eNB。 专用信令过程与捎带过程是相互并列的关系， 如果 MME采用专 用 SAE承载修改过程或者 UE上下文修改过程通知目标 eNB, 那么在 步骤 116的路径切换响应中就不用捎带更新后的 UE - AMBR值。
实施例二： 在 S1切换时的 UE-AMBR更新过程。
S1切换时要发生 MME的切换， 即从源 MME切换到目标 MME, 处理流程如图 2所示， 包括如下步骤：
步骤 201至步骤 203: 源 eNB决定发起切换过程，首先源 eNB判断 这个切换是否可以通过 X2接口完成， 如果不能， 将切换请求发送给源 MME发起一个基于 S1接口的切换过程。 源 MME选择目标 MME, 并 将包括 PDN网关和服务网关相关承载信息的移动管理实体 UE上下文 作为前向重定位请求， 发送给目标 MME。 目标 MME从所收到的前向 重定位请求得知 UE与源 eNB连接时激活的所有 APN。
步骤 204:本步骤仅用于服务网关重定位时， 目标 MME选择一个目 标服务网关， 对传送到目标 MME的所有承载建立用户平面。
包括步骤 204a目标 MME向目标服务网关发送建立承载请求，然后 步骤 204b目标服务网关向目标 MME返回建立 7 载响应。如果切换后与 切换前共用相同的服务网关， 则可以省略步骤 204。
步骤 205: 目标 MME要求目标 eNB建立 UE上下文， 包括需要 建立的承载的信息。
其中， 步骤 205a是目标 MME向目标 eNB发送切换请求， 该切换 请求中包括所需建立的承载信息。 步骤 205b是目标 eNB进行承载接纳 判决后， 向目标 MME返回切换响应， 该切换响应中包含目标 eNB允许 接纳的 7 载标识。
在步骤 205b之后， 目标 MME得知目标 eNB中允许接纳的承载标 识。 在此步骤之后， 目标 MME根据所收到的目标 eNB中允许接纳的承 载标识， 判断在 UE与源 eNB连接时激活的所有 APN是否在切换后与 目标 eNB都有承载连接保持， 若是， 则不需修改 UE-AMBR, 否则， 根 据切换后目标 eNB的承载连接情况修改目标 eNB中使用的 UE-AMBR, 并触发 SAE承载修改过程或 UE上下文修改过程，通过专用信令将更新 后的 UE-AMBR值通知目标 eNB。 目标 eNB收到该专用信令后将会使 用新的 UE-AMBR值进行资源调度， 直到收到下一个更新的 UE-AMBR 值。
步骤 206: 采用直接前转时， 目标 MME在目标 S-GW建立前转参 数配置。
步骤 207: 对前向重定位请求的响应； 如果在应用非直接前转时， 该步骤还传送前转通道的地址信息。
步骤 208: 用于非直接前转， 将目标 服务网关用于前转的 TEID传 递给源服务网关。
步骤 209： 除了通知源 eNB切换已经准备好， 可以通知 UE进行切 换外， 还携带有数据前转隧道地址参数， 完成前转通道的建立。 源 eNB 在步骤 210通知 UE可以改变接入网络了。
步骤 211a和 211b 分别表示直接前转和非直接前转的前转数据路 径。 步骤 212至步骤 213 : 当 UE进入目标接入系统， 并被接入网分配 唯一标识后， 发送切换确认消息通知目标 eNB ; 目标 eNB 再向目标 MME发送切换通知。
步骤 214: 目标 MME通知源 MME, UE已经成功接入目标系统。 此时在源 MME 中启动一个定时器， 用于监视何时释放源系统中的资 源。
步骤 215至 217: 目标 MME将目标 eNB为 载分配的隧道地址信 息发送给 S-GW ,建立 UE到 PDN-GW之间的下行传输通道。如果 S-GW 重定位了， 则步骤 16用于更新 S-GW与 PDN-GW之间的承载。
在步骤 212之后的任意时刻， UE可以发起 TAU过程， 更新在 HSS 中的位置信息， 该过程与本发明技术方案无关， 故不再赘述。
从以上实施例可以看出，尽管 S 1切换和 X2切换的的具体流程有所 不同，本发明提出的 UE-AMBR更新方案均包括如图 3所示的基本步骤： 步骤 301 : UE切换过程中的目标 eNB根据接收到的 UE的承载信 息对 UE进行接纳判决， 确定接纳的承载。
步骤 302： 目标 eNB将所接纳的 载通知 MME。
步骤 303 : MME根据所收到的目标 eNB接纳的承载来判断在与源 eNB连接时激活的所有 APN是否在切换后与目标 eNB都保持有承载连 接， 若是， 则不需修改 UE-AMBR, 否则， 根据切换后目标 eNB的承载 连接情况计算目标 eNB中使用的 UE-AMBR。
步骤 304: MME将更新后的 UE-AMBR值通知目标 eNB。
本发明实施例三提出一种 MME,该 MME可以用来实现 UE切换过 程中对 UE-AMBR进行更新。 该 MME的模块框图如图 4所示， 与本发 明方案无关的模块未在图 4中示出。
该 MME包括： 接收模块 401 , 用于接收来自目标基站的允许接纳的承载标识； 更新模块 402, 用于根据所述接收模块 401收到的允许接纳的承载 标识更新目标基站所要使用的 UE-AMBR;
通知模块 403 ,用于将所述更新模块 402得到的更新后的 UE-AMBR 通知目标基站。
所述更新模块 402包括：
判断单元 404, 用于根据所述允许接纳的承载标识， 判断与源 eNB 连接时激活的所有 APN是否在切换后与目标 eNB都保持有承载连接， 若否， 发出指示信号；
计算单元 405, 用于当收到所述判断单元 404的指示信号后， 根据 切换后目标 eNB的承载连接情况计算目标基站中使用的 UE-AMBR,得 到更新后的 UE-AMBR。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡 在本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均 应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种用户设备切换时获取承载状况的方法， 其特征在于， 包括 如下步骤：
在用户设备切换时， 目标基站根据接收到的用户设备 UE的承载信 息对 UE进行接纳判决， 确定接纳的承载， 并将所接纳的承载通知移动 管理实体 MME;
MME根据所收到的目标基站接纳的承载， 对目标基站使用的用户 设备最大聚合比特率 UE-AMBR进行更新。
2、根据权利要求 1所述的方法， 其特征在于， 所述 MME根据所收 到的目标基站接纳的承载，对目标基站使用的 UE-AMBR进行更新包括：
MME根据所收到的目标基站接纳的承载， 判断在与源基站连接时 激活的所有接入节点名称 APN是否在切换后与目标基站都保持有承载 连接， 若是， 则不需修改 UE-AMBR; 否则， 根据切换后的目标 eNB的 承载连接情况修改目标基站使用的 UE-AMBR , 并将更新后的 UE-AMBR值通知目标基站。
3、 根据权利要求 2所述的方法， 其特征在于， 所述用户设备切换 为 MME保持不变的 X2切换。
4、 根据权利要求 3 所述的方法， 其特征在于， 所述目标基站将所 接纳的承载通知 MME为： 目标基站向 MME发送携带切换过程中成功 在目标基站接纳的承载标识的路径切换消息；
所述 MME将更新后的 UE-AMBR值通知目标基站为： MME向目 标基站发送携带更新后的 UE-AMBR值的路径切换响应。
5、根据权利要求 3所述的方法， 其特征在于， 所述 MME将更新后 的 UE-AMBR 值通知目标基站为： MME 通过专用信令将更新后的 UE-AMBR值通知目标基站。
6、 根据权利要求 5 所述的方法， 其特征在于， 所述专用信令为系 统架构演进 SAE 7 载修改请求或 UE上下文修改请求。
7、 根据权利要求 2所述的方法， 其特征在于， 所述用户设备切换 为 MME发生改变的 S1切换。
8、 根据权利要求 7所述的方法， 其特征在于， 所述目标基站将所 接纳的承载通知 MME为： 目标基站向目标 MME发送包含目标基站允 许接纳的 7 载标识的切换响应；
所述 MME将更新后的 UE-AMBR值通知目标基站为： MME触发 SAE承载修改过程或 UE上下文修改过程， 通过专用信令将更新后的 UE-AMBR值通知目标基站。
9、 根据权利要求 2 ~ 8中任一项所述的方法， 其特征在于， 所述将 更新后的 UE-AMBR值通知目标基站之后， 进一步包括：
所述目标基站用接收到的更新后的 UE-AMBR值替换自身已保存的 UE-AMBR值， 并按照更新后的 UE-AMBR值为非保证比特率 non-GBR 调度资源。
10、 一种移动管理实体 MME, 其特征在于， 包括：
接收模块， 用于接收来自目标基站的允许接纳的承载标识； 更新模块， 用于根据所述接收模块收到的允许接纳的承载标识更新 目标基站所要使用的 UE-AMBR;
通知模块， 用于将所述更新模块得到的更新后的 UE-AMBR通知目 标基站。
11、 根据权利要求 10所述的移动管理实体， 其特征在于， 所述更 新模块包括：
判断单元，用于根据所述允许接纳的承载标识，判断与源 eNB连接 时激活的所有 APN是否在切换后与目标 eNB都保持有承载连接，若否， 发出指示信号；
计算单元， 用于当收到所述判断单元的指示信号后， 根据切换后的 目标 eNB的承载连接情况计算目标基站中使用的 UE-AMBR,得到更新 后的 UE-AMBR。
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JP2011528877A (ja) 2011-11-24
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EP2306772A1 (en) 2011-04-06
US20110116478A1 (en) 2011-05-19
EP2306772B1 (en) 2015-02-25
EP2306772A4 (en) 2012-12-05
MX2011000905A (es) 2011-03-02
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CN101635962A (zh) 2010-01-27
CN101635962B (zh) 2012-01-04

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