技术领域technical field
本申请涉及无线通信技术领域，尤其涉及一种会话切换方法及装置。The present application relates to the field of wireless communication technologies, and in particular, to a session switching method and apparatus.
背景技术Background technique
多接入边缘计算(multi-acess edge computing，MEC)，也可以称为多接入边缘云(multi-acess edge-cloud，MEC)是在靠近人、物或数据源头的网络边缘侧，融合网络、计算、存储、应用等核心能力的开放平台，MEC可以利用无线接入网络就近提供电信用户所需服务和云端计算功能，从而创造出一个具备高性能、低延迟、高带宽的电信级服务环境，促进网络中各项内容、服务及应用的快速下载，让消费者享有高质量的网络体验。Multi-access edge computing (MEC), also known as multi-access edge-cloud (MEC), is a fusion network on the edge side of the network close to the source of people, things or data. , computing, storage, application and other core capabilities, MEC can use the wireless access network to provide services and cloud computing functions required by telecom users nearby, thereby creating a carrier-class service environment with high performance, low latency and high bandwidth , to promote the rapid download of various content, services and applications in the network, so that consumers can enjoy high-quality network experience.
在实际应用中，当终端因为移动性从一个MEC的覆盖区域移动到另一个MEC的覆盖区域(如车联网业务中，车辆的行进)或者根据服务质量(quality of service，QoS)情况执行跨平台切换以保证业务质量时需要发起MEC切换，然而MEC作为支撑运营商进行5G网络转型的关键技术，目前行业内还没有面向5G的MEC切换方法。In practical applications, when the terminal moves from the coverage area of one MEC to the coverage area of another MEC due to mobility (such as vehicle travel in the Internet of Vehicles service) or performs cross-platform execution according to the quality of service (QoS) situation When handover is required to ensure service quality, MEC handover needs to be initiated. However, MEC is a key technology to support operators in 5G network transformation. At present, there is no 5G-oriented MEC handover method in the industry.
发明内容SUMMARY OF THE INVENTION
本申请提供一种会话切换方法及装置，可以实现终端因为移动性或服务质量需求而发起的会话切换。The present application provides a session switching method and device, which can implement session switching initiated by a terminal due to mobility or service quality requirements.
为达到上述目的，本申请采用如下技术方案：To achieve the above object, the application adopts the following technical solutions:
第一方面，本申请提供一种会话切换方法，该方法包括：In a first aspect, the present application provides a session switching method, which includes:
会话管理网元将终端的会话从第一会话切换至第二会话，所述第一会话为所述终端与源用户面网元之间的会话，所述第二会话为所述终端与目标用户面网元之间的会话；所述会话管理网元向分类器发送业务分流规则，所述业务分流规则用于指示向所述目标用户面网元发送所述终端承载在所述第二会话上的业务。The session management network element switches the session of the terminal from the first session to the second session, where the first session is the session between the terminal and the source user plane network element, and the second session is the terminal and the target user The session between the plane network elements; the session management network element sends a service offload rule to the classifier, and the service offload rule is used to instruct the target user plane network element to send the terminal bearer on the second session. Business.
第二方面，本申请提供一种会话切换方法，该方法包括：In a second aspect, the present application provides a session switching method, which includes:
终端确定需要将会话从第一会话切换至第二会话；The terminal determines that the session needs to be switched from the first session to the second session;
所述终端向会话管理网元发送切换请求信令，所述切换请求信令用于指示所述终端存在从第一会话切换至第二会话的需求。The terminal sends switching request signaling to the session management network element, where the switching request signaling is used to indicate that the terminal needs to switch from the first session to the second session.
第三方面，提供了一种会话切换装置，该装置包括：In a third aspect, a session switching apparatus is provided, the apparatus comprising:
切换单元，用于将终端的会话从第一会话切换至第二会话，所述第一会话为所述终端与源用户面网元之间的会话，所述第二会话为所述终端与目标用户面网元之间的会话；发送单元，用于向分类器发送业务分流规则，所述业务分流规则用于指示向所述目标用户面网元发送所述终端承载在所述第二会话上的业务。a switching unit, configured to switch a session of the terminal from a first session to a second session, where the first session is a session between the terminal and a source user plane network element, and the second session is a session between the terminal and the target A session between user plane network elements; a sending unit, configured to send a service offload rule to a classifier, where the service offload rule is used to instruct to send to the target user plane network element that the terminal is carried on the second session Business.
第四方面，提供了一种会话切换装置，该装置包括：In a fourth aspect, a session switching apparatus is provided, the apparatus comprising:
确定单元，用于确定需要将会话从第一会话切换至第二会话；发送单元，用于向会话管理网元发送切换请求信令，所述切换请求信令用于指示所述终端存在从第一会话切换至第二会话的需求。The determining unit is configured to determine that the session needs to be switched from the first session to the second session; the sending unit is configured to send switching request signaling to the session management network element, where the switching request signaling is used to indicate that the terminal exists from the first session to the second session; The requirement of switching from one session to the second session.
第五方面，本申请提供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机执行该指令时，该计算机执行上述第一方面、第二方面及其各种可选的实现方式中任意之一所述的方法。In a fifth aspect, the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium. When a computer executes the instructions, the computer executes the first aspect, the second aspect, and various optional options thereof. Implement the method described in any one of the modes.
第六方面，本申请提供一种包含指令的计算机程序产品，当所述计算机程序产品在计算机上运行时，使得所述计算机执行上述第一方面、第二方面及其各种可选的实现方式中任意之一所述的方法。In a sixth aspect, the present application provides a computer program product containing instructions, when the computer program product runs on a computer, the computer enables the computer to execute the first aspect, the second aspect and various optional implementations thereof any of the methods described in .
第七方面，提供一种芯片，包括：处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行计算机程序或指令，以执行上述第一方面、第二方面所述的方法。In a seventh aspect, a chip is provided, comprising: a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run a computer program or instruction to execute the above-mentioned first and second aspects. method described.
本发明提供了一种会话切换方法及装置，会话管理网元通过与目标用户面网元的交互打通了终端与目标用户面网元之间的会话通道，通过与分类器之间的交互实现了业务分流规则的更新，进而实现了终端因为移动性或服务质量需求而发起的会话切换，保证了服务质量和终端业务的连续性。The present invention provides a session switching method and device. The session management network element opens up the session channel between the terminal and the target user plane network element through the interaction with the target user plane network element, and realizes the interaction with the classifier. The update of the service offloading rules further realizes the session handover initiated by the terminal due to mobility or service quality requirements, and ensures the service quality and the continuity of terminal services.
附图说明Description of drawings
图1为本申请的实施例提供的一种通信系统的结构示意图；FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application;
图2为本申请的实施例提供的一种会话切换方法的流程示意图一；FIG. 2 is a schematic flowchart 1 of a session switching method provided by an embodiment of the present application;
图3为本申请的实施例提供的一种会话切换方法的流程示意图二；FIG. 3 is a second schematic flowchart of a session switching method provided by an embodiment of the present application;
图4为本申请的实施例提供的另一种会话切换方法的流程示意图；4 is a schematic flowchart of another session switching method provided by an embodiment of the present application;
图5为本申请的实施例提供的一种会话切换装置的结构示意图；FIG. 5 is a schematic structural diagram of a session switching apparatus according to an embodiment of the present application;
图6为本申请的实施例提供的另一种会话切换装置的结构示意图；FIG. 6 is a schematic structural diagram of another session switching apparatus provided by an embodiment of the present application;
图7为本申请实施例提供的一种芯片的结构示意图。FIG. 7 is a schematic structural diagram of a chip according to an embodiment of the present application.
具体实施方式Detailed ways
为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。例如，第一会话和第二会话仅仅是为了区分不同的会话，并不对其先后顺序进行限定。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect. For example, the first session and the second session are only for distinguishing different sessions, and the sequence of the sessions is not limited. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like are not necessarily different.
需要说明的是，本申请中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。It should be noted that, in this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiment or design described in this application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。The network architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. The evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B的情况，其中A，B可以是单数或者复数。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。In this application, "at least one" means one or more, and "plurality" means two or more. "And/or", which describes the association relationship of the associated objects, indicates that there can be three kinds of relationships, for example, A and/or B, which can indicate: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c may be single or multiple .
本申请实施例描述的系统架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。本申请实施例中以提供的方法应用于NR系统或5G网络中为例进行说明。The system architecture and service scenarios described in the embodiments of the present application are for the purpose of illustrating the technical solutions of the embodiments of the present application more clearly, and do not constitute limitations on the technical solutions provided by the embodiments of the present application. The evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems. In the embodiments of this application, the provided method is used in an NR system or a 5G network as an example for description.
如图1所示，本申请实施例提供一种通信系统，该通信系统包括：终端30、会话管理网元20、与会话管理网元20通信的分类器50，与分类器50通信的源用户面网元60以及目标用户面网元70。其中，目标用户面网元70与目标数据网络71通信，源用户面网元60与源数据网络61通信。As shown in FIG. 1 , an embodiment of the present application provides a communication system. The communication system includes: a terminal 30 , a session management network element 20 , a classifier 50 communicating with the session management network element 20 , and a source user communicating with the classifier 50 . The plane network element 60 and the target user plane network element 70. The target user plane network element 70 communicates with the target data network 71 , and the source user plane network element 60 communicates with the source data network 61 .
在一种可能的实现方式中，该通信系统还可以包括：接入网40以及与接入网40通信的移动管理网元10。其中，终端30通过接入网40接入核心网。终端30通过移动管理网元10与会话管理网元20通信。会话管理网元20、移动管理网元10、源用户面网元60以及目标用户面网元70属于核心网中的网元。In a possible implementation manner, the communication system may further include: an access network 40 and a mobility management network element 10 that communicates with the access network 40 . The terminal 30 accesses the core network through the access network 40 . The terminal 30 communicates with the session management network element 20 through the mobility management network element 10 . The session management network element 20, the mobility management network element 10, the source user plane network element 60 and the target user plane network element 70 belong to network elements in the core network.
移动管理网元10用于通信系统的移动性管理和接入管理等，例如终端的位置更新、终端注册、终端切换等。移动管理网元10与会话管理网元20连接，会话管理网元20需要通过移动管理网元10向终端30发送数据或指令。The mobility management network element 10 is used for mobility management and access management of the communication system, for example, terminal location update, terminal registration, terminal handover, and the like. The mobility management network element 10 is connected to the session management network element 20 , and the session management network element 20 needs to send data or instructions to the terminal 30 through the mobility management network element 10 .
在5G通信系统中，该移动管理网元可以是接入与移动性管理功能(core accessand mobility management function，AMF)网元。在未来通信系统中，移动管理网元仍可以是AMF网元，或者，还可以有其它的名称，本申请不做限定。In a 5G communication system, the mobility management network element may be an access and mobility management function (core access and mobility management function, AMF) network element. In the future communication system, the mobility management network element may still be an AMF network element, or may have other names, which are not limited in this application.
会话管理网元20用于通信系统的会话管理、终端的网络互连协议(internetprotocol，IP)地址分配和管理、选择可管理用户平面功能、策略控制和收费功能接口的终结点以及下行数据通知等。The session management network element 20 is used for session management of the communication system, Internet Protocol (IP) address allocation and management of terminals, selection of user plane functions that can be managed, termination points of policy control and charging function interfaces, and downlink data notification, etc. .
需要说明的，会话管理网元20在进行会话管理时所发起的信令，都为N4接口信令。It should be noted that the signaling initiated by the session management network element 20 during session management is all N4 interface signaling.
在5G通信系统中，该会话管理网元可以是会话管理功能(session managementfunction，SMF)网元，在未来通信系统中，会话管理网元还可以有其它的名称，本申请不做限定。In a 5G communication system, the session management network element may be a session management function (session management function, SMF) network element. In future communication systems, the session management network element may also have other names, which are not limited in this application.
终端30用于向用户提供语音和/或数据连通性服务。所述终端可以有不同的名称，例如用户设备(user equipment，UE)、接入终端、终端单元、终端站、移动站、移动台、远方站、远程终端、移动设备、无线通信设备、车辆用户设备、终端代理或终端装置等。可选的，所述终端可以为各种具有通信功能的手持设备、车载设备、可穿戴设备、计算机，本申请实施例对此不作任何限定。例如，手持设备可以是智能手机。车载设备可以是车载导航系统。可穿戴设备可以是智能手环。计算机可以是个人数字助理(personal digital assistant，PDA)电脑、平板型电脑以及膝上型电脑(laptop computer)。Terminal 30 is used to provide voice and/or data connectivity services to users. The terminal may have different names, such as user equipment (UE), access terminal, terminal unit, terminal station, mobile station, mobile station, remote station, remote terminal, mobile device, wireless communication device, vehicle user equipment, terminal agent or terminal device, etc. Optionally, the terminal may be various handheld devices, vehicle-mounted devices, wearable devices, and computers with communication functions, which are not limited in this embodiment of the present application. For example, the handheld device may be a smartphone. The in-vehicle device may be an in-vehicle navigation system. The wearable device can be a smart bracelet. The computer may be a personal digital assistant (PDA) computer, a tablet computer, and a laptop computer.
接入网40可以称为接入设备，也可以称为无线接入网(radio access network，RAN)。基站可以是全球移动通信系统(global system for mobile communication，GSM)，码分多址(code division multiple access，CDMA)中的基站(base transceiverstation，BTS)，宽带码分多址(wideband code division multiple access，WCDMA)中的基站(node B，eNB)，物联网(internet of things，IoT)或者窄带物联网(narrow band-internet of things，NB-IoT)中的eNB，未来5G移动通信网络或者未来演进的公共陆地移动网络(public land mobile network，PLMN)中的基站，本申请实施例对此不作任何限制。The access network 40 may be referred to as an access device, and may also be referred to as a radio access network (RAN). The base station may be a global system for mobile communication (GSM), a base transceiver station (BTS) in code division multiple access (CDMA), a wideband code division multiple access (wideband code division multiple access) , WCDMA) in the base station (node B, eNB), the Internet of things (internet of things, IoT) or narrowband Internet of things (narrow band-internet of things, NB-IoT) in the eNB, future 5G mobile communication network or future evolution A base station in a public land mobile network (public land mobile network, PLMN), which is not limited in this embodiment of the present application.
分类器50是用户面网元的一种，可以称为上行分类器，用于处理流量转发以及通过地址将业务分流到不同的用户面网元。分类器50可以根据预设路由规则将流量转发给不同的用户面网元，进而传输至该用户面网元所对应的数据网络。The classifier 50 is a kind of user plane network element, which may be called an uplink classifier, and is used for processing traffic forwarding and distributing services to different user plane network elements through addresses. The classifier 50 can forward the traffic to different user plane network elements according to preset routing rules, and then transmit the traffic to the data network corresponding to the user plane network elements.
在5G通信系统中，用户面网元可以是(user plane function，UPF)网元，在未来通信系统中，UPF网元还可以有其它的名称，本申请不做限定。In the 5G communication system, the user plane network element may be a (user plane function, UPF) network element. In the future communication system, the UPF network element may also have other names, which are not limited in this application.
源用户面网元60与目标用户面网元70用于，分组路由和转发以及用户面数据的服务质量(quality of service，QoS)处理等。The source user plane network element 60 and the target user plane network element 70 are used for packet routing and forwarding, and quality of service (quality of service, QoS) processing of user plane data.
数据网络是指为用户提供终端业务传输服务的运营商网络，如IP多媒体业务(IPmulti-media service，IMS)、互联网Internet等。本申请实施例中，DN可以为提供MEC业务的MEC服务器或MEC平台。A data network refers to an operator network that provides terminal service transmission services for users, such as an IP multimedia service (IPmulti-media service, IMS), the Internet, and the like. In this embodiment of the present application, the DN may be an MEC server or an MEC platform that provides MEC services.
在5G通信系统中，该数据网络可以是(data network，DN)。在未来通信系统中，数据网络仍可以是DN，或者，还可以有其它的名称，本申请不做限定。In a 5G communication system, the data network may be (data network, DN). In the future communication system, the data network may still be DN, or may have other names, which are not limited in this application.
需要说明的，上述通信系统中涉及的所有网元可以是专有的硬件，也可以是基于通用服务器部署的虚拟化功能，本申请不做限定。It should be noted that all network elements involved in the above communication system may be dedicated hardware, or may be a virtualization function deployed based on a general server, which is not limited in this application.
如图2所示，本申请实施例提供了一种会话切换方法，应用于上述通信系统，该方法的执行主体为会话管理网元，该方法包括：As shown in FIG. 2, an embodiment of the present application provides a session switching method, which is applied to the above-mentioned communication system. The execution subject of the method is a session management network element, and the method includes:
S101、会话管理网元将终端的会话从第一会话切换至第二会话。S101. The session management network element switches the session of the terminal from the first session to the second session.
结合图1，示例性的，第一会话可以是终端30与源用户面网元60之间的会话。第二会话可以是终端30与目标用户面网元70之间的会话。本申请实施例的关注点在于会话切换，因此其实现是基于终端30与源用户面网元60之间已经存在第一会话。然后会话管理网元20再通过与目标用户面网元70的交互实现第二会话的连接，通过与分类器50的交互实现业务分流到目标用户面网元70，最终实现将终端的会话从第一会话切换至第二会话。该第一会话和第二会话可以为协议数据单元(protocol data unit，PDU)会话。Referring to FIG. 1 , for example, the first session may be a session between the terminal 30 and the source user plane network element 60 . The second session may be a session between the terminal 30 and the target user plane network element 70 . The focus of the embodiment of the present application is on session switching, so the implementation is based on the existence of the first session between the terminal 30 and the source user plane network element 60 . Then the session management network element 20 realizes the connection of the second session by interacting with the target user plane network element 70, and realizes the service offload to the target user plane network element 70 by interacting with the classifier 50, and finally realizes the terminal session from the first A session switches to a second session. The first session and the second session may be protocol data unit (protocol data unit, PDU) sessions.
S102、会话管理网元向分类器发送业务分流规则。S102. The session management network element sends a service distribution rule to the classifier.
会话管理网元20将终端的会话从第一会话切换至第二会话后，分类器50的业务分流规则也会发生变化。即由原来的将业务转发给源用户面网元60，改变为转发给目标用户面网元70。After the session management network element 20 switches the session of the terminal from the first session to the second session, the service distribution rule of the classifier 50 will also change. That is, the original service is forwarded to the source user plane network element 60 , and the service is changed to be forwarded to the target user plane network element 70 .
具体的，终端会话切换前的业务分流规则为第一业务分流规则，第一业务分流规则用于指示向源用户面网元60发送终端30承载在第一会话上的业务。终端会话切换到第二会话时，终端30与目标用户面网元70之间存在新的业务分流规则。切换后的业务分流规则可以简称为业务分流规则。该业务分流规则用于指示向目标用户面网元70发送终端30承载在第二会话上的业务。Specifically, the service offload rule before the terminal session switching is the first service offload rule, and the first service offload rule is used to instruct the source user plane network element 60 to send the service carried by the terminal 30 on the first session. When the terminal session is switched to the second session, a new service distribution rule exists between the terminal 30 and the target user plane network element 70 . The switched service distribution rule may be referred to as a service distribution rule for short. The service offloading rule is used to instruct the target user plane network element 70 to send the service carried by the terminal 30 on the second session.
可选的，该业务分流规则还用于指示将来自目标用户面网元70的业务传输至终端30接入的接入网40。Optionally, the service distribution rule is also used to instruct to transmit the service from the target user plane network element 70 to the access network 40 accessed by the terminal 30 .
本申请实施例提供的会话切换方法，会话管理网元通过与目标用户面网元的交互打通了终端与目标用户面网元之间的会话通道，通过与分类器之间的交互实现了业务分流规则的更新，进而实现了终端因为移动性或服务质量需求而发起的会话切换，保证了服务质量和终端业务的连续性。In the session switching method provided by the embodiment of the present application, the session management network element opens up the session channel between the terminal and the target user plane network element through interaction with the target user plane network element, and realizes service offload through interaction with the classifier The update of the rules further realizes the session handover initiated by the terminal due to mobility or service quality requirements, and ensures the service quality and the continuity of terminal services.
在一种可能的实施例中，如图3所示，本申请实施例提供的方法包括：In a possible embodiment, as shown in FIG. 3 , the method provided by the embodiment of the present application includes:
S201、会话管理网元接收来自终端或源用户面网元的切换请求信令。S201. The session management network element receives the handover request signaling from the terminal or the source user plane network element.
当终端30因为移动性导致其所归属的数据网络发生变换，或者源数据网络61因为服务质量达不到要求而需要进行数据网络变换时，即需要从源数据网络61切换至目标数据网络71时，终端30或者与源数据网络61连接的源用户面网元60首先需要向会话管理网元20发送切换请求信令。该切换请求信令用于指示终端30存在从第一会话切换至第二会话的需求。When the data network to which the terminal 30 belongs is changed due to mobility, or the source data network 61 needs to change the data network because the service quality does not meet the requirements, that is, when it is necessary to switch from the source data network 61 to the target data network 71 , the terminal 30 or the source user plane network element 60 connected to the source data network 61 first needs to send handover request signaling to the session management network element 20 . The handover request signaling is used to indicate that the terminal 30 needs to switch from the first session to the second session.
当会话管理网元20接收到来自终端30或源用户面网元60的切换请求信令即可以确认终端30存在从第一会话切换至第二会话的需求。When the session management network element 20 receives the handover request signaling from the terminal 30 or the source user plane network element 60, it can confirm that the terminal 30 needs to switch from the first session to the second session.
S202、会话管理网元向目标用户面网元发送会话建立信息。S202. The session management network element sends session establishment information to the target user plane network element.
会话管理网元20通过S201确认终端30存在从第一会话切换至第二会话的需求后，则开始执行用户面重置。会话管理网元20首先向目标用户面网元70发送会话建立信息，该会话建立信息可以为N4会话建立请求(N4session establishment request)，包括分类器50的标识信息。After the session management network element 20 confirms through S201 that the terminal 30 needs to switch from the first session to the second session, it starts to perform user plane reset. The session management network element 20 first sends session establishment information to the target user plane network element 70 , where the session establishment information may be an N4 session establishment request, including identification information of the classifier 50 .
分类器50的标识信息可以为分类器50的隧道ID。该隧道ID用于使目标用户面网元70识别业务是被该分类器50所分流的。隧道ID是指分类器到目标用户面网元70的通路，承载在隧道中的PDU会话也可以通过隧道ID获知隧道的起点和终点。The identification information of the classifier 50 may be the tunnel ID of the classifier 50 . The tunnel ID is used for the target user plane network element 70 to identify that the traffic is offloaded by the classifier 50 . The tunnel ID refers to the path from the classifier to the target user plane network element 70, and the PDU session carried in the tunnel can also learn the start and end points of the tunnel through the tunnel ID.
该会话建立信息还可以包括包检测信息，用于辅助会话管理网元20建立到目标用户面网元70的会话。The session establishment information may also include packet detection information for assisting the session management network element 20 to establish a session to the target user plane network element 70 .
S203、会话管理网元接收来自目标用户面网元的响应信息。S203. The session management network element receives the response information from the target user plane network element.
目标用户面网元70接收到会话建立信息后，可以向会话管理网元20发送响应信息。该响应信息可以为N4会话建立响应(N4sessionAfter receiving the session establishment information, the target user plane network element 70 may send response information to the session management network element 20 . The response information can be an N4 session establishment response (N4 session
establishment response)。相应的，会话管理网元20接收来自目标用户面网元70的响应信息。该响应信息包括目标用户面网元70的地址信息。该地址信息可以为目标用户面网元70的隧道ID。收到响应消息则表示已经将终端30同目标用户面网元70建立第二会话。establishment response). Correspondingly, the session management network element 20 receives the response information from the target user plane network element 70 . The response information includes address information of the target user plane network element 70 . The address information may be the tunnel ID of the target user plane network element 70 . When the response message is received, it means that the second session has been established between the terminal 30 and the target user plane network element 70 .
本申请实施例中，N4会话的会话类型包括网际协议版本(Internet Protocolversion，IPV)4、IPV6、以太网类型等。In the embodiment of the present application, the session type of the N4 session includes Internet Protocol version (Internet Protocol version, IPV) 4, IPV6, Ethernet type, and the like.
对于IPV6会话，会话管理网元20需要分配给目标用户面网元70新的IPV6前缀作为目标用户面网元70的隧道ID，新的IPV6前缀用于使目标用户面网元70被分类器50所识别，从而使分类器50将业务分流到目标用户面网元70。For an IPV6 session, the session management network element 20 needs to assign a new IPV6 prefix to the target user plane network element 70 as the tunnel ID of the target user plane network element 70, and the new IPV6 prefix is used to make the target user plane network element 70 be classified by the classifier 50. identified, thereby causing the classifier 50 to offload the traffic to the target user plane network element 70 .
S204、会话管理网元向分类器发送业务分流规则。S204. The session management network element sends the service distribution rule to the classifier.
会话管理网元20通过N4会话修改请求(N4session modification request)向分类器50发送新的业务分流规则，该业务分流规则包括目标用户面网元70的地址信息、以及地址信息与目标用户面网元70之间的映射关系。该地址信息可以是目标用户面网元70的隧道ID，通过该映射关系分类器50可以根据目标用户面网元70的地址信息确定目标用户面网元70，进而确定可以向目标用户面网元70分流。从而完成终端30到目标用户面网元70之间的上行业务传输。The session management network element 20 sends a new service distribution rule to the classifier 50 through an N4 session modification request. The service distribution rule includes the address information of the target user plane network element 70, and the address information and the target user plane network element. The mapping relationship between 70. The address information may be the tunnel ID of the target user plane network element 70. The mapping relationship classifier 50 can determine the target user plane network element 70 according to the address information of the target user plane network element 70, and then determine that the target user plane network element 70 can be sent to the target user plane network element. 70 split. Thus, the uplink service transmission between the terminal 30 and the target user plane network element 70 is completed.
该业务分流规则还用于指示将来自目标用户面网元70的业务传输至终端30接入的接入网40。从而完成目标用户面网元70到终端30之间的下行业务传输。The service distribution rule is also used to instruct to transmit the service from the target user plane network element 70 to the access network 40 accessed by the terminal 30 . Thus, the downlink service transmission between the target user plane network element 70 and the terminal 30 is completed.
分类器50接收到该业务分流规则后，通过N4会话修改请求(N4sessionmodification response)发出一个确认(acknowledgement，ACK)响应，表明分类器50已经配置了该业务分流规则(即会话管理网元20所要求更新的内容已经完成)。After the classifier 50 receives the service offloading rule, it sends an acknowledgement (ACK) response through the N4 session modification request (N4sessionmodification response), indicating that the classifier 50 has been configured with the service offloading rule (that is, the session management network element 20 requires The updated content has been completed).
S205、会话管理网元向终端发送地址信息。S205. The session management network element sends address information to the terminal.
由于从第一会话切换为第二会话，因此终端30传输业务的目标地址也发生了变化，会话管理网元20需要向终端30发送目标用户面网元70的地址信息，该地址信息用于终端30封装承载在第二会话上的业务。即终端30可以通过地址信息确定承载在第二会话上的业务应该发送的目标地址。Due to the switch from the first session to the second session, the destination address of the terminal 30 for transmitting services also changes. The session management network element 20 needs to send the address information of the target user plane network element 70 to the terminal 30, and the address information is used by the terminal. 30 Encapsulates the service carried on the second session. That is, the terminal 30 can determine the destination address to which the service carried on the second session should be sent through the address information.
至此，终端30同目标用户面网元70建立了用户面连接，终端30可以通过该用户面连接向目标数据网络71发送上行业务。目标数据网络71也可以通过该用户面连接向终端30发送下行业务。So far, the terminal 30 has established a user plane connection with the target user plane network element 70, and the terminal 30 can send uplink services to the target data network 71 through the user plane connection. The target data network 71 can also send downlink services to the terminal 30 through the user plane connection.
此时，终端30通过分类器50维持着与源数据网络61以及目标数据网络71的业务连接。即分类器50既可以将终端30承载在第一会话上的业务向源数据网络61分流，也可以将终端30承载在第二会话上的业务向目标数据网络71分流。At this time, the terminal 30 maintains the service connection with the source data network 61 and the target data network 71 through the classifier 50 . That is, the classifier 50 can not only offload the service carried by the terminal 30 on the first session to the source data network 61 , but also can offload the service carried by the terminal 30 on the second session to the target data network 71 .
S206、会话管理网元向源用户面网元发送会话释放信息。S206. The session management network element sends session release information to the source user plane network element.
为减少不必要的资源占用，会话管理网元20向源用户面网元60发送会话释放信息。该会话释放信息可以为N4会话释放请求(N4session release request)，携带第一会话的标识信息，用于指示源用户面网元60释放第一会话。即源用户面网元60需要释放分配给终端30与源用户面网元60相连接的所有会话资源，包括与第一会话相关的所有隧道资源和上下文。In order to reduce unnecessary resource occupation, the session management network element 20 sends session release information to the source user plane network element 60 . The session release information may be an N4 session release request (N4 session release request), which carries the identification information of the first session and is used to instruct the source user plane network element 60 to release the first session. That is, the source user plane network element 60 needs to release all session resources allocated to the terminal 30 connected to the source user plane network element 60, including all tunnel resources and contexts related to the first session.
相应的，源用户面网元60发送一个N4会话释放响应(N4session releaseresponse)至会话管理网元20，该N4会话释放响应携带第一会话的标识信息，用于表示源用户面网元60已经释放了与第一会话相关的所有隧道资源和上下文。Correspondingly, the source user plane network element 60 sends an N4 session release response (N4 session releaseresponse) to the session management network element 20, and the N4 session release response carries the identification information of the first session, which is used to indicate that the source user plane network element 60 has been released. all tunnel resources and contexts associated with the first session.
此时，终端30维持着同目标数据网络71之间的业务联系，而之前的同源数据网络61之间的业务联系和相关会话资源已全部被释放掉。At this time, the terminal 30 maintains the service connection with the target data network 71, and the previous service connection and related session resources between the same-origin data network 61 have been released.
S207、会话管理网元向终端发送切换响应信息。S207. The session management network element sends handover response information to the terminal.
最后，会话管理网元20向终端30发送切换响应信息，该切换响应信息用于使终端30确定已从第一会话切换至第二会话。Finally, the session management network element 20 sends the handover response information to the terminal 30, where the handover response information is used to make the terminal 30 determine that it has been handed over from the first session to the second session.
本申请实施例提供的会话切换方法，会话管理网元不仅完成了终端与第二会话的建立，还通过与源用户面网元的交互实现了第一会话资源的释放，节约了传输资源，实现了终端从第一会话到第二会话的切换。In the session switching method provided by the embodiment of the present application, the session management network element not only completes the establishment of the terminal and the second session, but also realizes the release of the first session resources through interaction with the source user plane network element, saves transmission resources, and realizes The terminal switches from the first session to the second session.
本申请还提供了另一种会话切换方法的实施例，如图4所示，该方法可以包括：The present application also provides an embodiment of another session switching method, as shown in FIG. 4 , the method may include:
S301、终端确定需要将会话从第一会话切换至第二会话。S301. The terminal determines that the session needs to be switched from the first session to the second session.
当终端30由于移动性导致其所归属的数据网络发生变换时，终端30可以确定需要将会话从第一会话切换至第二会话。When the data network to which the terminal 30 belongs is changed due to mobility, the terminal 30 may determine that the session needs to be switched from the first session to the second session.
S302、终端向会话管理网元发送切换请求信令。S302. The terminal sends a handover request signaling to the session management network element.
终端30由于移动性使与其存在业务连接的数据网络发生变化，因此需要进行数据网络的切换，终端30向会话管理网元20发送切换请求信令，该切换请求信令用于指示终端30存在从第一会话切换至第二会话的需求。Due to the mobility of the terminal 30, the data network with which it has a service connection changes, so it needs to switch the data network. The terminal 30 sends the switching request signaling to the session management network element 20. The requirement for switching from the first session to the second session.
S303、终端接收来自会话管理网元的地址信息。S303. The terminal receives the address information from the session management network element.
终端30接收来自会话管理网元20的地址信息，该地址信息用于封装终端30承载在第二会话上的业务。即终端30需要通过地址信息获知承载在第二会话上的业务应该发送的目标地址。The terminal 30 receives the address information from the session management network element 20, where the address information is used to encapsulate the service carried by the terminal 30 on the second session. That is, the terminal 30 needs to know the destination address to which the service carried on the second session should be sent through the address information.
S304、终端接收来自会话管理网元的切换响应信息。S304. The terminal receives the handover response information from the session management network element.
最后，终端30接收来自会话管理网元20的切换响应信息，该切换响应信息用于使终端30确定已从第一会话切换至第二会话。Finally, the terminal 30 receives the handover response information from the session management network element 20, where the handover response information is used to make the terminal 30 determine that it has been handed over from the first session to the second session.
本申请实施例提供的会话切换方法，终端通过发送切换请求信令发起会话切换，通过接收来自会话管理网元的地址信息确定承载在新的会话即第二会话上的业务应该发送的目的地，最后通过接收来自会话管理网元的切换响应信息确定完成了从第一会话切换至第二会话的流程。从而完成了终端的跨平台切换和业务重新分流。In the session switching method provided by the embodiment of the present application, the terminal initiates the session switching by sending the switching request signaling, and determines the destination to which the service carried on the new session, that is, the second session, should be sent by receiving the address information from the session management network element, Finally, it is determined that the process of switching from the first session to the second session is completed by receiving the switching response information from the session management network element. Thus, the cross-platform switching of the terminal and the redistribution of services are completed.
本申请实施例提供了一种会话切换装置，应用于会话管理网元，也可以应用于会话管理网元的芯片，如图5所示，该装置400可以包括：The embodiment of the present application provides a session switching device, which is applied to a session management network element, and can also be applied to a chip of a session management network element. As shown in FIG. 5 , the device 400 may include:
切换单元401，用于将终端的会话从第一会话切换至第二会话，所述第一会话为所述终端与源用户面网元之间的会话，所述第二会话为所述终端与目标用户面网元之间的会话。The switching unit 401 is configured to switch a session of a terminal from a first session to a second session, where the first session is a session between the terminal and a source user plane network element, and the second session is a session between the terminal and a source user plane network element. Sessions between target user plane network elements.
发送单元402，用于向分类器发送业务分流规则，所述业务分流规则用于指示向所述目标用户面网元发送所述终端承载在所述第二会话上的业务。The sending unit 402 is configured to send a service offload rule to the classifier, where the service offload rule is used to instruct to send the service carried by the terminal on the second session to the target user plane network element.
可选的，切换单元401，具体用于：Optionally, the switching unit 401 is specifically used for:
确认终端存在从第一会话切换至第二会话的需求；向目标用户面网元发送会话建立信息，该会话建立信息包括分类器的标识信息；接收来自目标用户面网元的响应信息，该响应信息包括目标用户面网元的地址信息。Confirm that the terminal needs to switch from the first session to the second session; send session establishment information to the target user plane network element, where the session establishment information includes the identifier information of the classifier; receive response information from the target user plane network element, the response The information includes address information of the target user plane network element.
可选的，该装置400还可以包括：Optionally, the apparatus 400 may further include:
接收单元403，用于接收来自终端或源用户面网元的切换请求信令，该切换请求信令用于指示所述终端存在从第一会话切换至第二会话的需求。The receiving unit 403 is configured to receive a handover request signaling from a terminal or a source user plane network element, where the handover request signaling is used to indicate that the terminal needs to switch from the first session to the second session.
可选的，业务分流规则包括目标用户面网元的地址信息与目标用户面网元之间的映射关系。Optionally, the service distribution rule includes a mapping relationship between the address information of the target user plane network element and the target user plane network element.
可选的，发送单元402，还用于向终端发送地址信息，该地址信息用于封装终端承载在第二会话上的业务。Optionally, the sending unit 402 is further configured to send address information to the terminal, where the address information is used to encapsulate the service carried by the terminal on the second session.
可选的，发送单元402，还用于向源用户面网元发送会话释放信息，该会话释放信息用于指示源用户面网元释放第一会话。Optionally, the sending unit 402 is further configured to send session release information to the source user plane network element, where the session release information is used to instruct the source user plane network element to release the first session.
可选的，发送单元402，还用于向终端发送切换响应信息，该切换响应信息用于使终端确定已将会话从第一会话切换至第二会话。Optionally, the sending unit 402 is further configured to send switching response information to the terminal, where the switching response information is used to enable the terminal to determine that the session has been switched from the first session to the second session.
本申请实施例提供了另一种会话切换装置，应用于终端，如图6所示，该装置500可以包括：This embodiment of the present application provides another apparatus for session switching, which is applied to a terminal. As shown in FIG. 6 , the apparatus 500 may include:
确定单元501，用于确定需要将会话从第一会话切换至第二会话。The determining unit 501 is configured to determine that the session needs to be switched from the first session to the second session.
发送单元502，用于向会话管理网元发送切换请求信令，所述切换请求信令用于指示所述终端存在从第一会话切换至第二会话的需求。The sending unit 502 is configured to send switching request signaling to the session management network element, where the switching request signaling is used to indicate that the terminal needs to switch from the first session to the second session.
可选的，该装置500还可以包括：Optionally, the apparatus 500 may further include:
接收单元503，用于接收来自会话管理网元的地址信息，该地址信息用于封装所述终端承载在所述第二会话上的业务。The receiving unit 503 is configured to receive address information from a session management network element, where the address information is used to encapsulate the service carried by the terminal on the second session.
可选的，该接收单元503，还用于接收来自会话管理网元的切换响应信息，该切换响应信息用于使终端确定已将会话从第一会话切换至第二会话。Optionally, the receiving unit 503 is further configured to receive handover response information from the session management network element, where the handover response information is used to enable the terminal to determine that the session has been handed over from the first session to the second session.
图7示出了本申请实施例提供的芯片600的结构示意图。该芯片600包括：一个或两个以上(包括两个)处理器602和通信接口603。处理器602用于对该芯片600的动作进行控制管理，例如，执行上述切换单元401或确定单元501执行的步骤，和/或用于执行本文所描述的技术的其它过程。通信接口603和处理器602耦合，用于支持芯片600与其他网络实体的通信。FIG. 7 shows a schematic structural diagram of a chip 600 provided by an embodiment of the present application. The chip 600 includes: one or more than two (including two) processors 602 and a communication interface 603 . The processor 602 is used to control and manage the actions of the chip 600, for example, to perform the steps performed by the switching unit 401 or the determination unit 501 described above, and/or to perform other processes of the techniques described herein. The communication interface 603 is coupled to the processor 602 for supporting the communication between the chip 600 and other network entities.
上述处理器602可以是实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。该处理器可以是中央处理器，通用处理器，数字信号处理器，专用集成电路，现场可编程门阵列或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等。The processor 602 described above may be a logical block, module, or circuit that implements or executes the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. The processor may be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.
可选的，该芯片600还可以包括存储器601和总线604，存储器601用于存储该芯片600的程序代码和数据。Optionally, the chip 600 may further include a memory 601 and a bus 604 , and the memory 601 is used to store program codes and data of the chip 600 .
其中，存储器601可以是芯片600中的存储器，该存储器可以包括易失性存储器，例如随机存取存储器；该存储器也可以包括非易失性存储器，例如只读存储器，快闪存储器，硬盘或固态硬盘；该存储器还可以包括上述种类的存储器的组合。The memory 601 may be the memory in the chip 600, and the memory may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, hard disk or solid state Hard disk; the memory may also include a combination of the above types of memory.
总线604可以是扩展工业标准结构(Extended Industry StandardArchitecture，EISA)总线等。总线604可以分为地址总线、数据总线、控制总线等。为便于表示，图7中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。The bus 604 may be an Extended Industry Standard Architecture (EISA) bus or the like. The bus 604 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 7, but it does not mean that there is only one bus or one type of bus.
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。From the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is used as an example for illustration. In practical applications, the above functions can be allocated as required. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. For the specific working process of the system, apparatus and unit described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.
本申请实施例提供一种包含指令的计算机程序产品，当所述计算机程序产品在计算机上运行时，使得所述计算机执行上述方法实施例所述的会话切换方法。The embodiments of the present application provide a computer program product containing instructions, when the computer program product runs on a computer, the computer is made to execute the session switching method described in the above method embodiments.
本申请实施例还提供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当网络设备执行该指令时，该网络设备执行上述方法实施例所示的方法流程中网络设备执行的各个步骤。Embodiments of the present application further provide a computer-readable storage medium, where an instruction is stored in the computer-readable storage medium. When a network device executes the instruction, the network device executes the process performed by the network device in the method flow shown in the above method embodiments. each step.
其中，计算机可读存储介质，例如可以是但不限于电、磁、光、电磁、红外线、或半导体的系统、装置或器件，或者任意以上的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括：具有一个或多个导线的电连接、便携式计算机磁盘、硬盘、随机存取存储器(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦式可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、寄存器、硬盘、光纤、便携式紧凑磁盘只读存储器(Compact Disc Read-Only Memory，CD-ROM)、光存储器件、磁存储器件、或者上述的任意合适的组合、或者本领域熟知的任何其它形式的计算机可读存储介质。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于特定用途集成电路(Application Specific Integrated Circuit，ASIC)中。在本申请实施例中，计算机可读存储介质可以是任何包含或存储程序的有形介质，该程序可以被指令执行系统、装置或者器件使用或者与其结合使用。The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, or any combination of the above. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (Read-Only Memory, ROM), Erasable Programmable Read-Only Memory (EPROM), registers, hard disks, optical fibers, Portable Compact Disc Read-Only Memory (CD-ROM) ), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing, or any other form of computer-readable storage medium known in the art. An exemplary storage medium is coupled to the processor, such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium may be located in an Application Specific Integrated Circuit (ASIC). In the embodiments of the present application, the computer-readable storage medium may be any tangible medium that contains or stores a program, and the program may be used by or in combination with an instruction execution system, apparatus, or device.
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应该以权利要求的保护范围为准。The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this, and any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. . Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
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