WO2011134151A1 - 一种中止电路交换域返回传统网络呼叫的方法、装置和系统 - Google Patents

一种中止电路交换域返回传统网络呼叫的方法、装置和系统 Download PDF

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Publication number
WO2011134151A1
WO2011134151A1 PCT/CN2010/072312 CN2010072312W WO2011134151A1 WO 2011134151 A1 WO2011134151 A1 WO 2011134151A1 CN 2010072312 W CN2010072312 W CN 2010072312W WO 2011134151 A1 WO2011134151 A1 WO 2011134151A1
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Prior art keywords
call
message
csfb
mme
called
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PCT/CN2010/072312
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English (en)
French (fr)
Inventor
陈海永
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201080001620.7A priority Critical patent/CN102365899B/zh
Priority to PCT/CN2010/072312 priority patent/WO2011134151A1/zh
Priority to JP2013505302A priority patent/JP5547337B2/ja
Priority to EP10850484.6A priority patent/EP2549824B1/en
Publication of WO2011134151A1 publication Critical patent/WO2011134151A1/zh
Priority to US13/661,495 priority patent/US20130045738A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/10Connection setup
    • H04W76/18Management of setup rejection or failure

Definitions

  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, apparatus, and system for terminating a circuit switched domain to return to a conventional network call. Background technique
  • GPRS/UMTS is a mobile communication network defined by the 3GPP organization and has been widely deployed. It includes two parts: Radio Access Network (RAN) and Core Network (CN).
  • the CN is logically divided into a Circuit Switched Domain (CS) and a Packet Switched Domain (PS).
  • CS Circuit Switched Domain
  • PS Packet Switched Domain
  • the CS domain mainly handles voice services
  • the PS domain mainly handles packet services.
  • the signaling plane control entity of the CS domain is the Mobile Switch Center/Visitor Location Register (MSC/VLR), and the signaling plane control entity of the PS domain is the Serving GPRS Support Node (SGSN). ).
  • MSC/VLR Mobile Switch Center/Visitor Location Register
  • SGSN Serving GPRS Support Node
  • GPRS/UMTS network is simply referred to as a 2G/3G network.
  • LTE Long Term Evolution
  • EPS evolved packet system
  • the MME cannot sense that the calling party has already released the call, and receives the user equipment (User Equipment, UE). After the service request is extended, the MME still triggers the subsequent call procedure of the CSFB, and sends a paging response message to the MSC through the circuit domain. Since the call resource in the MSC has been translated, the MSC considers that the received paging response message is an abnormal message and discards the message.
  • User Equipment User Equipment
  • Embodiments of the present invention provide a method for suspending a CSFB call, a mobility management entity, a visitor location register, and a communication system, and in the existing CSFB call flow, the calling side initiates a call. After the release, the UE fails to detect the UE and the UE fails to switch back to 2G/3G.
  • An embodiment of the present invention provides a method for CSFB to abort a call, including:
  • the VLR determines whether it is necessary to suspend the call
  • an SGs message indicating that the call is aborted is sent to the MME to cause the MME to reject the CSFB call.
  • the embodiment of the invention further provides a mobility management entity, including:
  • a receiving unit configured to receive an SGs message sent by the visited location register VLR to indicate that the call is aborted
  • Call reject unit used to reject CSFB calls.
  • An embodiment of the present invention further provides a visit location register, including:
  • a call suspension determination unit configured to determine whether it is necessary to suspend the call
  • a sending unit configured to send an SGs message indicating that the call is aborted to the MME when the call needs to be aborted, so that the MME rejects the CSFB call.
  • an embodiment of the present invention further provides a communication system, including:
  • the mobility management entity is configured to receive the SGs message sent by the visited location register, and reject the CSFB call.
  • the method, the device, and the system provided by the embodiment of the present invention by sending an SGs message indicating that the call is suspended to the MME, so that the MME rejects the CSFB call, and after the calling party initiates the call release, the called UE may be prevented from originating.
  • 2G/3G switching saves network resources; at the same time, it avoids invalid switching and causes user service experience to decrease.
  • Embodiment 1 is a flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 3 is a flowchart of a method according to Embodiment 3 of the present invention
  • FIG. 5 is a structural block diagram of a visit location register according to Embodiment 5 of the present invention.
  • FIG. 6 is a schematic diagram of a communication system according to Embodiment 6 of the present invention. detailed description
  • Embodiment 1 of the present invention is a diagrammatic representation of Embodiment 1 of the present invention.
  • FIG. 1 is a flowchart of a method for returning a circuit switched domain service to a legacy network according to the present invention. As shown in FIG. 1, the method may include: 5101. The VLR determines whether it is necessary to suspend the call.
  • VLR The MSC and the VLR in all embodiments of the present invention may be combined and collectively referred to as a VLR.
  • the VLR can determine whether it is necessary to suspend the call based on the received message initiated by the caller. For example, if the calling party initiates a call release message, or a call abort message, or a call cancellation message, the VLR judges that the call needs to be aborted.
  • the calling party Before the called party is connected, the calling party initiates a call release message.
  • the specific reason may be that the calling party actively hangs up, the calling VLR is overloaded, and the calling VLR actively terminates the call due to the operation management OM operation aborting the call, or the calling user operating error. .
  • the VLR may send a specific type of SGs message to the MME, that is, by using a message type, for example, the message type is "SGs Service Abort Request" to indicate that the MME call is released; or the message may be carried in the message to notify the MME that the call has been translated.
  • a message type for example, the message type is "SGs Service Abort Request" to indicate that the MME call is released; or the message may be carried in the message to notify the MME that the call has been translated.
  • the MME learns that the calling call is released, and can directly send a call suspension message to the called UE to indicate that the call is released.
  • the called UE learns that the calling party has released the call. End the call process.
  • the MME learns that the calling call is released, receives the extended service request message sent by the called UE, and sends a service request rejection message to suspend the current CSFB call.
  • the MME after receiving the call release message sent by the VLR, the MME rejects the CSFB call, and can prevent the called UE from switching to the 2G/3G network in an invalid manner, thereby saving network side resources. At the same time, the invalid handover of the called UE is avoided to cause a reduction in the service experience.
  • Embodiment 2 of the present invention :
  • a processing procedure for the calling UE to actively release the call is as follows:
  • the VLR receives the incoming call request, and determines that the current user has an SGs association.
  • the SGs interface is an interface between the VLR and the MME. Through the SGs interface, the circuit domain service related message can be transmitted in the EPS network to implement CSFB.
  • the UE may register and register the VLR through the MME, and the VLR may also page the UE through the SGs interface; if there is an association, the VLR sends a paging message to the MME through the SGs interface; if there is no association, the VLR directly The circuit domain is paged.
  • the VLR sends a paging message to the MME, instructing the MME to initiate paging.
  • the interface of the called UE may pop up a dialog box prompting the user to select whether to accept the call.
  • the MME If the MME detects that the UE is in an idle state, the MME first needs to initiate a process of paging the UE.
  • the UE directly responds to the CSFB call.
  • the VLR sends a ring back tone to the calling side.
  • This step is an optional step.
  • the MSC sends a ring back tone to the calling side UE, which prevents the calling user from hearing long silence.
  • the VLR determines whether it is necessary to suspend the call.
  • the VLR judges that the call needs to be aborted; when the VLR is overloaded and the VLR suspends the call due to the operation management OM operation, the VLR judges that the call needs to be aborted.
  • the calling party Before the called party is connected, the calling party initiates a call release message.
  • the specific reason may be that the calling party actively hangs up, the calling VLR is overloaded, and the calling VLR actively suspends the call due to the OM operation aborting the call or the calling user operating error.
  • the VLR sends a call suspension message to the MME, indicating that the MME call is released.
  • the VLR may send a specific type of message to the MME, that is, by using a message type, for example, the message type is “SGs Service Abort Request” to indicate that the MME call is released. or
  • the VLR can notify the MME that the call has been released by carrying an indication in the message.
  • the "call release” herein may also be “call cancellation”, “call abort”, etc., which is not limited by the present invention.
  • the MME may reject the current CSFB call response initiated by the UE.
  • the called UE does not know that the calling party has already released the call, so the extended service request message is still sent to the MME;
  • the MME sends a service request rejection message to the UE, and the current CSFB call is suspended. After receiving the service request rejection message sent by the MME, the UE may not switch to the 2G/3G network.
  • the MME after receiving the call suspension request of the VLR, the MME indicates that the current call has been released, and subsequently receives the extended service request message of the UE, and determines that the cause value indicates CSFB. If the call is accepted, the MME sends a service rejection message to the called UE.
  • the MME does not need to send a paging reject request to the VLR, and does not need to send a service reject message to the UE.
  • the MME records that the call suspension state is valid, and the cause value in the extended service request message sent by the called UE indicates that the CSFB call accepts, and sends a service request rejection message to the called UE; receives the paging message of the VLR, or Upon receiving the extended service request of the UE, the MME records that the status of the call suspension message is set to be invalid or empty.
  • the MME may also start a timer. If the extended service request from the UE is received before the timer expires, the MME sends a service reject message directly to the called UE according to the cause value carried therein, or does not need to send a page to the VLR. Reject the message.
  • the MME sends an acknowledgement message to the VLR.
  • This step is an optional step, and is used to confirm that the message of step S207 has been received;
  • the VLR responds to the calling side with a "call release response".
  • This step can also occur after S201, ie in parallel with the SGs interface processing.
  • the MME after receiving the call release message sent by the VLR, the MME rejects the CSFB call, and can prevent the called UE from switching to the 2G/3G network in an invalid manner, thereby saving network side resources. At the same time, the invalid handover of the called UE is avoided to cause a reduction in the service experience.
  • Embodiment 3 of the present invention :
  • S301 The VLR receives the incoming call request, and determines that the current user has an SGs association, that is, the SGs state is not empty;
  • a paging message is sent to the MME through the SGs interface; if there is no associated VLR, the paging is performed directly in the circuit domain.
  • the VLR sends a paging message to the MME, instructing the MME to initiate paging.
  • the interface of the called UE may pop up a dialog box prompting the user to select whether to accept the call.
  • the MME If the MME detects that the UE is in an idle state, the MME first needs to initiate a paging UE process.
  • the MME sends a service request message directly to the VLR, to notify the MSC that the paging has succeeded.
  • the UE directly responds to the CSFB call.
  • the VLR may send a ring back tone to the calling side to prevent the calling user from hearing a long silence.
  • the VLR determines whether it is necessary to suspend the call.
  • the VLR judges that the call needs to be aborted; when the called VLR is overloaded, the called VLR terminates the call due to the OM operation, and the VLR judges that the call needs to be aborted.
  • the calling party Before the called party is connected, the calling party initiates a call release message.
  • the specific reason may be that the calling party actively hangs up, the calling VLR is overloaded, the calling VLR terminates the call due to the OM operation, or the calling party The user actively opts the call if the user operates incorrectly.
  • the VLR sends a call suspension message to the MME, indicating that the MME call is released.
  • the VLR may send a specific type of SGs message to the MME, that is, by using a message type, for example, the message type is “SGs Service Abort Request” to indicate that the MME calls the translation. Put; or
  • the VLR can notify the MME that the call has been translated by carrying an indication in the message.
  • the "call release” herein may also be “call cancellation”, “call abort”, etc., which is not limited by the present invention.
  • the MME may reject the current CSFB call response initiated by the UE.
  • the MME sends a message indicating that the CSFB call is suspended to the called UE, to indicate that the call is released.
  • the called UE After the called UE receives the message, it knows that the calling party has released the call and ends the call flow.
  • the message indicating that the CSFB call is suspended is specifically a non-access stratum NAS message, and the NAS message carries a cell indicating that the call is aborted.
  • the UE sends an acknowledgement message to the MME.
  • This step is an optional step for confirming that the message in S308 has been received
  • the MME sends an acknowledgement message to the VLR.
  • This step is an optional step, and is used to confirm that the message of step S307 has been received;
  • the MSC may respond to the calling party with a "call release response".
  • This step can also occur after S201, ie in parallel with the SGs interface processing.
  • the MME after receiving the call release message sent by the VLR, the MME sends a call release message to the called UE, which can prevent the called UE from switching to the 2G/3G network, thereby saving network side resources. At the same time, the invalid handover of the called UE is avoided to cause a reduction in the service experience.
  • the second embodiment and the third embodiment can be combined.
  • the VLR sends a call release message to the MME
  • the called UE learns that the call has been suspended, and does not initiate the extended service.
  • the MME follows the method of the second embodiment. After receiving, the UE sends an extended service request, and the subsequent MME rejects the service request.
  • the fourth embodiment of the present invention provides an MME for suspending a CSFB call, including:
  • the receiving unit 401 is configured to receive an SGs message sent by the VLR to indicate that the call is suspended, and a call rejecting unit 402, configured to reject the CSFB call.
  • the receiving unit 401 is further used for the extended service request message sent by the called UE. If the extended service request message received by the receiving unit 401 carries the cause value indicating that the UE accepts the CSFB call, the call rejecting unit 402 is configured to The UE sends a service request rejection message and rejects the CSFB call sent by the subsequent UE.
  • the call rejecting unit 402 here can also be used to send a message to the called UE indicating that the CSFB call is aborted.
  • the call denial unit 402 may record that the status of the call suspension is valid, and the cause value in the extended service request message sent by the called UE indicates that the CSFB call is accepted, and then sends a service request rejection message to the called UE;
  • the call rejecting unit 402 records that the state of the call suspension is set to be invalid or empty.
  • the call rejecting unit 402 may also start a timer. If the extended service request from the UE is received before the timer expires, the service reject message is directly sent to the called UE according to the cause value carried therein, or the VLR is not sent to the VLR. Paging rejection message.
  • the MME of the embodiment of the present invention rejects the CSFB call after receiving the SGs message sent by the VLR indicating that the call is aborted. It can avoid the switchback of the called UE to the 2G/3G network, which saves resources on the network side. At the same time, the invalid handover of the called UE is avoided to cause a reduction in the service experience.
  • the fifth embodiment of the present invention provides a VLR for suspending a CSFB call, including:
  • the call suspension determining unit 501 is configured to determine whether it is necessary to suspend the call
  • the sending unit 502 is configured to send an SGs message indicating that the call is suspended to the MME, so that the MME rejects the CSFB call.
  • the call suspension determining unit 501 is specifically configured to receive a call release message sent by the calling party, or a call cancellation message, or a call suspension message.
  • the sending unit 502 sends an SGs message indicating that the call is aborted to the MME, so that the MME can reject the CSFB call, and avoid the switchback of the called UE to the 2G/3G network, which saves the network side resources.
  • the invalid handover of the called UE is avoided to cause a reduction in the service experience.
  • the fifth embodiment of the present invention provides a communication system for suspending a CSFB call, including:
  • Visiting location register 601 for determining whether a call needs to be aborted, and if it is necessary to abort the call, Sending an SGs message indicating that the call is suspended to the MME;
  • the mobility management entity 602 is configured to receive the SGs message sent by the visitor location register 601, and reject the CSFB call.
  • the called UE when the calling party releases the call, the called UE can be prevented from being inactively switched back to the 2G/3G network, thereby saving network side resources. At the same time, the invalid handover of the called UE is avoided, resulting in a reduction in the service experience.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment description, or the corresponding changes may be located in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

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  • Computer Networks & Wireless Communication (AREA)
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Description

一种中止电路交换域返回传统网络呼叫的方法、 装置和系统 技术领域
本发明实施例涉及通信技术领域, 尤其涉及一种中止电路交换域返回 传统网络呼叫的方法、 装置和系统。 背景技术
GPRS/UMTS是 3GPP组织定义的一种移动通信网络, 得到了广泛的 部署。 包括无线接入网络( Radio Access Network, 以下简称 RAN ) 和核 心网络( Core Network, CN )两部分。 CN从逻辑上分为电路交换域( Circuit Switched Domain, CS ) 和分组交换 i或 ( Packet Switched Domain, PS ) 。 CS 域主要处理语音业务, PS域主要处理分组业务。 CS域的信令面控制实体 为移动交换中心 /拜访位置寄存器 (Mobile Switch Center/ Visitor Location Register, MSC/VLR ) , PS 域的信令面控制实体为服务 GPRS 支持节点 ( Serving GPRS Support Node, SGSN ) 。 通常 GPRS/UMTS网络简称为 2G/3G网络。
随着无线通讯网络的快速发展,原有的 2G/3G网络已经无法满足用户 对带宽和 QoS等需求, 3GPP组织在 2004年底制了长期演进计划 ( Long Term Evolution, LTE ) , 在该演进计划的指导下定义了新的移动通信网络 的架构,该架构比现在的 2G/3G网络架构更加扁平,并且只保留了分组域, 因此称为演进的分组网络 ( evolved packet system, EPS ) 。
传统运营商在部署 EPS 网络之前都是通过 2G/3G网络电路域提供语 音业务和其他电路域相关的补充业务如传真业务。 在 EPS网络部署初期, 运营商一般都会选择重用现有的 2G/3G 网络提供语音业务和其他电路域 相关的补充业务, 为了实现这种功能, 在 EPS 中提出了通过 EPS核心网 连接到 2G/3G 电路域核心网的方法, 使用户能通过 EPS 网络快速回到 2G/3G电路域完成电路域业务, 这种架构和处理方法可以称为电路交换域 业务返回传统网络 ( CS Fallback, CSFB ) 。 一种典型的 CSFB架构下, EPS网络中的移动性管理实体 ( Mobility Management Entity , ΜΜΕ )通过 SGs接口连接到传统 2G/3G电路域核心网的 MSC/VLR上。
对于在被叫接通之前,主叫侧发起呼叫释放的场景,依照现有的 CSFB 终呼机制, MME无法感知主叫侧已经译放了呼叫,在收到用户设备(User Equipment, UE )的扩展业务请求以后, MME仍会触发 CSFB的后续呼叫 过程, 并通过电路域向 MSC发送寻呼响应消息。 由于 MSC中的呼叫资源 已经译放, MSC会认为收到的寻呼响应消息为异常消息并丟弃该消息。
现有的 CSFB呼叫机制中, 由于 MME无法感知主叫侧已经译放了呼 叫,被叫侧还是会执行从 LTE到 2G/3G的切换, UE又会重新切换回 LTE , 两次无效的切换浪费了网络资源。 而且, 被叫用户选择接听电话后, 发现 根本无法进行通话, 且由于发生了切换, 用户正在进行的 PS业务也会受 到影响, 用户体验降低。 发明内容
本发明实施例提供一种中止 CSFB呼叫的方法、 移动性管理实体、 拜 访位置寄存器和通信系统, 解决现有 CSFB呼叫流程中, 主叫侧发起呼叫 释放后 , 因 MME无法感知而 UE无效切换回 2G/3G的问题。
本发明实施例提供一种 CSFB中止呼叫的方法, 包括:
VLR判断是否需要中止呼叫;
若需要中止呼叫, 则向 MME发送指示呼叫中止的 SGs消息, 以使所 述 MME拒绝 CSFB呼叫。
本发明实施例还提供一种移动性管理实体, 包括:
接收单元,用于接收拜访位置寄存器 VLR发送的指示呼叫中止的 SGs 消息;
呼叫拒绝单元, 用于拒绝 CSFB呼叫。
本发明实施例还提供一种拜访位置寄存器, 包括:
呼叫中止判断单元, 用于判断是否需要中止呼叫;
发送单元, 用于需要中止呼叫时, 向 MME发送指示呼叫中止的 SGs 消息 , 以使所述 MME拒绝 CSFB呼叫。
相应地, 本发明实施例还提供一种通信系统, 包括:
拜访位置寄存器, 用于判断是否需要中止呼叫, 若需要中止呼叫, 则 向 MME发送指示呼叫中止的 SGs消息;
移动性管理实体, 用于接收所述拜访位置寄存器发送的 SGs消息, 拒 绝 CSFB呼叫。
通过本发明实施例提供的方法、 装置及系统, 通过向 MME发送指示 呼叫中止的 SGs消息 , 以使所述 MME拒绝 CSFB呼叫, 在主叫侧发起呼 叫译放后, 可以阻止被叫 UE发起到 2G/3G的切换, 节省了网络资源; 同 时避免了无效的切换造成用户业务体验的降低。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作一简单地介绍, 显而易见地, 下 面描述中的附图是本发明的一些实施例, 对于本领域普通技术人员来讲, 在 不付出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例一的方法流程图;
图 2为本发明实施例二的方法流程图;
图 3为本发明实施例三的方法流程图; 图 5为本发明实施例五的拜访位置寄存器结构框图;
图 6为本发明实施例六的通信系统示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本 发明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描 述,显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创造性劳动的前 提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例一:
图 1为本发明电路交换域业务返回传统网络的一个方法实施例的流程 图, 如图 1所示, 该方法可以包括: 5101、 VLR判断是否需要中止呼叫;
本发明所有实施例中的 MSC和 VLR可以合设, 统称为 VLR。
VLR可以根据接收到的主叫发起的消息, 判断是否需要中止呼叫。 比 如, 主叫发起呼叫释放消息 , 或呼叫中止消息 , 或呼叫取消消息 , 则 VLR 的判断结果为需要中止呼叫。
在被叫接通之前, 主叫发起呼叫释放消息, 具体原因可以为主叫用户 主动挂机,主叫 VLR过载 ,主叫 VLR由于操作管理 OM操作中止呼叫, 或 者主叫用户操作错误而主动中止呼叫。
5102、 若需要中止呼叫, 则向 MME发送指示呼叫中止的 SGs消息, 以使所述 MME拒绝 CSFB呼叫。
VLR可以向 MME发送特定类型的 SGs消息,即通过消息类型,比如, 消息类型为 "SGs服务中止请求" 以指示 MME呼叫释放; 或者可以通过 消息中携带指示, 通知 MME呼叫已经译放。
MME收到指示呼叫中止的 SGs消息后, 获知主叫呼叫译放, 可以直 接向被叫 UE发送呼叫中止消息, 指示呼叫释放, 被叫 UE收到该消息后, 获知主叫已译放呼叫 ,结束呼叫流程。或者 MME收到指示呼叫中止的 SGs 消息后, 获知主叫呼叫释放, 接收被叫 UE发送的扩展业务请求消息, 发 送业务请求拒绝消息 , 中止本次 CSFB呼叫。
本实施例中 MME收到 VLR发送的呼叫释放消息后 ,拒绝 CSFB呼叫 , 可以避免被叫 UE无效切换到 2G/3G网络, 节省了网络侧资源。 同时避免 了被叫 UE的无效切换造成业务体验的降低。 本发明实施例二:
CSFB场景下被叫接通前, 主叫 UE主动译放呼叫的一种处理流程如 下:
S201、 VLR收到入局的呼叫请求, 判断当前用户存在 SGs关联; SGs接口是 VLR和 MME之间的接口, 通过 SGs接口, 可以在 EPS 网络中传递电路域服务相关的消息以实现 CSFB。比如, UE可以通过 MME 向 VLR进行注册和位置登记 , VLR也可以通过 SGs接口对 UE进行寻呼; 如果存在关联, VLR会通过 SGs接口向 MME发送寻呼消息; 如果不 存在关联, VLR直接在电路域进行寻呼。
S202、 VLR向 MME发送寻呼消息 , 指示 MME发起寻呼;
S203a、 如果 MME检测到 UE处于连接态, 通过向 UE发送 CS业务 通知消息, 指示 UE有一个 CSFB的入局呼叫;
具体地, 被叫 UE的界面可以弹出一个对话框, 提示用户选择是否接 受呼叫。
S203b、 如果 MME检测到 UE处于空闲态, MME首先需要发起寻呼 UE的流程;
5204、 如果 UE处于连接态, MME直接向 VLR发送业务请求消息, 通知 VLR寻呼已经成功;
需要说明的是, 如果 UE处于空闲态, 则 UE直接响应 CSFB呼叫。
5205、 VLR向主叫侧发送回铃音;
本步骤为可选步骤, MSC向主叫侧 UE发送回铃音, 可以避免主叫用 户听到长时间的静音。 S206、 VLR判断是否需要中止呼叫;
如果收到主叫发起的呼叫释放消息, 则 VLR 的判断结果为需要中止 呼叫; 在 VLR过载 , VLR由于操作管理 OM操作中止呼叫的时候 , VLR 的判断结果也为需要中止呼叫。
在被叫接通之前, 主叫发起呼叫释放消息, 具体原因可以为主叫用户 主动挂机, 主叫 VLR过载, 主叫 VLR由于 OM操作中止呼叫, 或者主叫 用户操作错误而主动中止呼叫。
S207、 VLR向 MME发送呼叫中止消息 , 指示 MME呼叫释放; 具体地, VLR可以向 MME发送特定类型的消息, 即通过消息类型, 比如, 消息类型为 "SGs服务中止请求" 以指示 MME呼叫释放; 或者
VLR可以通过消息中携带指示, 通知 MME呼叫已经释放。 另外, 这 里的 "呼叫释放" 也可以为 "呼叫取消" 、 "呼叫中止(Abort ) " 等, 本 发明对此不做限定;
MME收到此消息后 , 可以拒绝 UE发起的本次 CSFB呼叫响应;
5208、 被叫 UE向 MME发送扩展业务请求消息;
被叫 UE未获知主叫已经译放呼叫, 所以仍然向 MME发送扩展业务 请求消息;
5209、 MME向 UE发送业务请求拒绝消息 , 中止本次 CSFB呼叫; UE收到 MME发送的业务请求拒绝消息后, 可以不用切换到 2G/3G 网络。
具体地 , MME在收到 VLR的呼叫中止请求以后, 表示当前的呼叫已 经释放,后续收到 UE的扩展业务请求消息,判断其中的原因值指示 CSFB 呼叫接受, 则 MME向被叫 UE发送服务拒绝消息;
需要说明的是, 如果 UE发送的扩展业务请求消息中携带的原因值指 示 CSFB呼叫拒绝, 则 MME不需要向 VLR发送寻呼拒绝请求, 也不需要 再向 UE发送服务拒绝消息;
具体地, MME记录呼叫中止状态为有效, 并且被叫 UE发送的扩展 业务请求消息中的原因值指示 CSFB呼叫接受, 则向被叫 UE发送业务请 求拒绝消息; 收到 VLR的寻呼消息, 或者收到 UE的扩展业务请求时, MME记录呼叫中止消息的状态设置为无效或清空。
MME也可以启动一个定时器, 在定时器超时以前, 如果收到来自 UE 的扩展业务请求, 根据其中携带的原因值, MME直接向被叫 UE发送服 务拒绝消息, 或者不需要向 VLR发送寻呼拒绝消息。
S210、 MME向 VLR发送确认消息;
本步骤为可选步骤, 用于确认已经收到步骤 S207的消息;
S211、 VLR向主叫侧回应 "呼叫译放响应" 。
本步骤也可以发生在 S201之后, 即与 SGs接口处理并行。
本实施例中 MME收到 VLR发送的呼叫释放消息后 ,拒绝 CSFB呼叫 , 可以避免被叫 UE无效切换到 2G/3G网络, 节省了网络侧资源。 同时避免 了被叫 UE的无效切换造成业务体验的降低。 本发明实施例三:
CSFB场景下被叫接通前, 主叫 UE主动译放呼叫的另一种处理流程 如下: S301、 VLR收到入局的呼叫请求, 判断当前用户存在 SGs关联, 即 SGs状态不为空;
如果存在关联 VLR会通过 SGs接口向 MME发送寻呼消息; 如果不 存在关联 VLR直接在电路域进行寻呼。
S302、 VLR向 MME发送寻呼消息, 指示 MME发起寻呼;
S303a、 如果 MME检测到 UE处于连接态, 通过向 UE发送 CS业务 通知消息, 指示 UE有一个 CSFB的入局呼叫;
具体地, 被叫 UE的界面可以弹出一个对话框, 提示用户选择是否接 受呼叫。
S303b、 如果 MME检测到 UE处于空闲态, MME首先需要发起寻呼 UE流程;
5304、 如果 UE处于连接态, MME直接向 VLR发送业务请求消息, 通知 MSC寻呼已经成功;
需要说明的是, 如果 UE处于空闲态, 则 UE直接响应 CSFB呼叫。
5305、 可选地, VLR可以向主叫侧发送回铃音, 以避免主叫用户听到 长时间的静音;
5306、 VLR判断是否需要中止呼叫;
如果收到主叫发起呼叫译放消息, 则 VLR 的判断结果为需要中止呼 叫; 在被叫 VLR过载 , 被叫 VLR由于 OM操作中止呼叫的时候 , VLR的 判断结果也为需要中止呼叫。
在被叫接通之前, 主叫发起呼叫释放消息, 具体原因可以为主叫用户 主动挂机, 主叫 VLR过载, 主叫 VLR由于 OM操作中止呼叫, 或者主叫 用户操作错误而主动中止呼叫。
5307、 VLR向 MME发送呼叫中止消息 , 指示 MME呼叫释放; 具体地, VLR可以向 MME发送特定类型的 SGs消息, 即通过消息类 型, 比如, 消息类型为 "SGs服务中止请求" 以指示 MME呼叫译放; 或 者
VLR可以通过消息中携带指示, 通知 MME呼叫已经译放。 另外, 这 里的 "呼叫释放" 也可以为 "呼叫取消" 、 "呼叫中止(Abort ) " 等, 本 发明对此不做限定;
MME收到此消息后 , 可以拒绝 UE发起的本次 CSFB呼叫响应;
5308、 MME向被叫 UE发送指示 CSFB呼叫中止的消息, 以指示呼叫 释放;
被叫 UE收到该消息后, 获知主叫已译放呼叫, 结束呼叫流程。
具体地, 这里指示 CSFB呼叫中止的消息具体为非接入层 NAS消息, 该 NAS消息中携带指示呼叫中止的信元。
5309、 UE向 MME发送确认消息;
本步骤为可选步骤, 用于确认已经收到 S308中的消息;
5310、 MME向 VLR发送确认消息;
本步骤为可选步骤, 用于确认已经收到步骤 S307的消息;
5311、 MSC可以向主叫侧回应 "呼叫译放响应" 。
本步骤也可以发生在 S201之后, 即与 SGs接口处理并行。
本实施例中 MME收到 VLR发送的呼叫释放消息后,向被叫 UE发送 呼叫译放消息,可以避免被叫 UE切换到 2G/3G网络,节省了网络侧资源。 同时避免了被叫 UE的无效切换造成业务体验的降低。
需要指出的是, 实施例二和实施例三可以结合,在 VLR向 MME发送 呼叫译放消息之后, 若被叫 UE能识别该消息, 则被叫 UE获知呼叫已经 中止, 后续不会发起扩展业务请求消息, 中止呼叫流程, 实际处理过程会 遵循实施例三的方法; 若被叫 UE不能识别该消息, 则 UE可能会接受呼 叫并向网络侧发送扩展业务请求, MME 遵循实施例二的方法进行处理, 收到 UE发送扩展业务请求, 后续 MME拒绝业务请求。
本发明实施例四
与上述方法实施例对应, 本发明实施例四提供一种用于中止 CSFB呼 叫的 MME, 包括:
接收单元 401 , 用于接收 VLR发送的指示呼叫中止的 SGs消息; 呼叫拒绝单元 402, 用于拒绝 CSFB呼叫。
这里的接收单元 401进一步用于被叫 UE发送的扩展业务请求消息,若 接收单元 401接收的扩展业务请求消息携带了指示 UE接受 CSFB呼叫的 原因值, 则呼叫拒绝单元 402, 用于向被叫 UE发送业务请求拒绝消息, 拒绝后续 UE发送的 CSFB呼叫。
这里的呼叫拒绝单元 402, 还可以用于向被叫 UE发送指示 CSFB呼叫 中止的消息。
具体地, 呼叫拒绝单元 402可以记录呼叫中止的状态为有效, 并且被 叫 UE发送的扩展业务请求消息中的原因值指示 CSFB呼叫接受, 则向被 叫 UE发送业务请求拒绝消息; 收到 VLR的寻呼消息, 或者收到 UE的扩 展业务请求时,呼叫拒绝单元 402记录呼叫中止的状态设置为无效或清空。 呼叫拒绝单元 402也可以启动一个定时器, 在定时器超时以前, 如果 收到来自 UE的扩展业务请求, 根据其中携带的原因值, 直接向被叫 UE 发送服务拒绝消息, 或者不需要向 VLR发送寻呼拒绝消息。
本发明实施例的 MME,接收 VLR发送的指示呼叫中止的 SGs消息后, 拒绝 CSFB呼叫。 可以避免被叫 UE无效的切换回 2G/3G网络, 节省了网 络侧资源。 同时避免了被叫 UE的无效切换造成业务体验的降低。
本发明实施例五
与上述方法实施例对应, 本发明实施例五提供一种用于中止 CSFB呼 叫的 VLR, 包括:
呼叫中止判断单元 501 , 用于判断是否需要中止呼叫;
发送单元 502, 用于向 MME发送指示呼叫中止的 SGs消息, 以使所 述 MME拒绝 CSFB呼叫。
这里的呼叫中止判断单元 501 , 具体用于接收主叫发送的呼叫译放消 息, 或呼叫取消消息, 或呼叫中止消息。 判断为需要中止呼叫时, 发送单 元 502向 MME发送指示呼叫中止的 SGs消息,可以使得 MME拒绝 CSFB 呼叫, 避免了被叫 UE无效的切换回 2G/3G网络, 节省了网络侧资源。 同 时避免了被叫 UE的无效切换造成业务体验的降低。 本发明实施例六
与上述方法实施例对应, 本发明实施例五提供一种用于中止 CSFB呼 叫的通信系统, 包括:
拜访位置寄存器 601 , 用于判断是否需要中止呼叫, 若需要中止呼叫, 则向 MME发送指示呼叫中止的 SGs消息;
移动性管理实体 602, 用于接收拜访位置寄存器 601发送的 SGs消息, 拒绝 CSFB呼叫。
本发明实施例的通信系统, 主叫译放呼叫时, 可以避免被叫 UE无效 切换回 2G/3G网络, 节省了网络侧资源。 同时避免了被叫 UE的无效切换 造成业务体验的降低。
本领域技术人员可以理解附图只是一个优选实施例的示意图, 附图中 的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实施例 描述进行分布于实施例的装置中, 也可以进行相应变化位于不同于本实施 例的一个或多个装置中。 上述实施例的模块可以合并为一个模块, 也可以 进一步拆分成多个子模块。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对 其限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通 技术人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修 改, 或者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权利要求
1、一种电路交换域返回传统网络 CSFB中止呼叫的方法,其特征在于, 包括:
拜访位置寄存器 VLR判断是否需要中止呼叫;
若需要中止呼叫,则向移动性管理实体 MME发送指示呼叫中止的 SGs 消息 , 以使所述 MME拒绝 CSFB呼叫。
2、 根据权利要求 1所述的方法, 其特征在于, 所述 MME拒绝 CSFB 呼叫, 包括:
接收所述被叫 UE发送的扩展业务请求消息;
向被叫 UE发送业务请求拒绝消息。
3、 根据权利要求 2所述的方法, 其特征在于, 若所述被叫 UE发送的 扩展业务请求消息, 携带了指示 UE接受 CSFB呼叫的原因值, 则 MME 向所述被叫 UE发送业务请求拒绝消息。
4、 根据权利要求 1所述的方法, 其特征在于, 所述拒绝 CSFB呼叫, 包括:
向所述被叫 UE发送指示 CSFB呼叫中止的消息。
5、 根据权利要求 4所述的方法, 其特征在于, 所述指示 CSFB呼叫中 止的消息具体为非接入层 NAS消息, 所述 NAS消息中携带指示呼叫中止 的信元。
6、 根据权利要求 1 所述的方法, 其特征在于, 所述 VLR判断是否需 要中止呼叫之前, 进一步包括:
接收主叫发送的呼叫释放消息, 或呼叫取消消息, 或呼叫中止消息。
7、 一种移动性管理实体, 其特征在于, 包括:
接收单元, 用于接收拜访位置寄存器 VLR发送的指示呼叫中止的 SGs 消息;
呼叫拒绝单元, 用于拒绝 CSFB呼叫。
8、 根据权利要求 7所述的移动性管理实体, 其特征在于,
所述接收单元进一步用于, 接收所述被叫 UE 发送的扩展业务请求消 息。
9、 根据权利要求 8所述的移动性管理实体, 其特征在于,
若所述接收单元接收的扩展业务请求消息携带了指示被叫 UE 接受 CSFB呼叫的原因值,
则所述呼叫拒绝单元, 用于向被叫 UE发送业务请求拒绝消息。
10、 根据权利要求 7所述的移动性管理实体, 其特征在于,
所述呼叫拒绝单元,用于向所述被叫 UE发送指示 CSFB呼叫中止的消 息。
11、 一种拜访位置寄存器, 其特征在于, 包括:
呼叫中止判断单元, 用于判断是否需要中止呼叫;
发送单元, 用于向移动性管理实体 MME发送指示呼叫中止的 SGs消 息 , 以使所述 MME拒绝电路交换域返回传统网络 CSFB呼叫。
12、 根据权利要求 11所述的拜访位置寄存器, 其特征在于,
所述呼叫中止判断单元, 进一步用于接收主叫发送的呼叫释放消息, 或呼叫取消消息, 或呼叫中止消息。
13、 一种路交换域返回传统网络 CSFB 通信系统, 包括拜访位置寄存 器、 移动性管理实体, 其特征在于,
所述拜访位置寄存器, 用于判断是否需要中止呼叫, 若需要中止呼叫, 则向移动性管理实体 MME发送指示呼叫中止的 SGs消息;
所述移动性管理实体,用于接收所述拜访位置寄存器发送的 SGs消息, 拒绝 CSFB呼叫。
PCT/CN2010/072312 2010-04-28 2010-04-28 一种中止电路交换域返回传统网络呼叫的方法、装置和系统 WO2011134151A1 (zh)

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US20130045738A1 (en) 2013-02-21
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