CN109548170B

CN109548170B - A connection establishment method, network element, storage medium and system

Info

Publication number: CN109548170B
Application number: CN201710607456.8A
Authority: CN
Inventors: 戴谦
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-07-24
Filing date: 2017-07-24
Publication date: 2024-11-05
Anticipated expiration: 2037-07-24
Also published as: CN109548170A; WO2019019990A1

Abstract

The present invention discloses a connection establishment method, network element, storage medium and system, the method comprising: upon receiving a connection request initiated by a user terminal B, the access network element determines the terminal group to which the user terminal B belongs; the access network element determines a user terminal that can be pre-processed for connection in the terminal group; the access network element performs connection pre-processing on the determined user terminal. The technical solution of the present invention can quickly establish or restore an RRC connection and effectively reduce the overhead cost of control plane signaling.

Description

A connection establishment method, network element, storage medium and system

技术领域Technical Field

本发明涉及通讯技术领域，特别是涉及一种连接建立方法、存储介质、网元及系统。The present invention relates to the field of communication technology, and in particular to a connection establishment method, a storage medium, a network element and a system.

背景技术Background Art

随着物联网的发展，用户终端数量不断增加成为行业背景，海量连接对网络接入的负荷问题、系统效率问题已经成为目前研究的重点之一。With the development of the Internet of Things, the number of user terminals continues to increase, which has become the background of the industry. The load problem of massive connections on network access and system efficiency have become one of the current research focuses.

低成本、小带宽、小数据是物联网设备的典型特征之一，这类设备接入网络的持续时间短，传输数据量小，但设备保有量非常巨大，每一次设备和无线通信网络建立连接都会导致大量空口的控制面信令以及地面侧的控制面信令的开销，其中以RAN侧的上下文的建立过程消耗的控制面信令为主，但相比于设备传输的数据量来说，存在控制面信令开销大于用户面数据量的情况，这导致系统传输效率的低下。目前3GPP在增强MTC(Machine-typecommunication，机器类型通信)、窄带物联(NBIOT，Narrow Band Internet of Things)、5G新网络(5G new Radio Access Technology)等研究中，如何降低海量接入所带来的控制面信令开销成本是重要研究方向之一。Low cost, small bandwidth, and small data are typical characteristics of IoT devices. The duration of network access of such devices is short, and the amount of data transmitted is small, but the number of devices is very large. Each time a device establishes a connection with a wireless communication network, a large amount of control plane signaling of the air interface and the control plane signaling overhead on the ground side will be generated. The control plane signaling consumed in the context establishment process on the RAN side is the main one. However, compared with the amount of data transmitted by the device, there is a situation where the control plane signaling overhead is greater than the user plane data volume, which leads to low system transmission efficiency. At present, 3GPP is studying the enhancement of MTC (Machine-type communication), Narrow Band Internet of Things (NBIOT), and 5G new network (5G new Radio Access Technology). How to reduce the control plane signaling overhead cost caused by massive access is one of the important research directions.

在目前3GPP讨论的LTE标准和5G new RAT标准中，分别在LTE引入了lightconnected(轻连接)状态，在5G new RAT引入了inactive(非活动)状态，这2个状态的本质类似，对LTE RAN和5G RAN来说，light connected状态和inactive状态均属于RRC连接态的子状态，终端若处于light connected状态或inactive状态时，其与RAN的RRC连接仍然保持，信令承载和数据承载仍然保持，但与RRC连接态的区别在于：终端和RAN需保存终端上下文，终端的移动性采用小区重选方式，终端监听RAN和CN的寻呼。In the LTE standard and 5G new RAT standard currently discussed by 3GPP, the light connected state is introduced in LTE, and the inactive state is introduced in 5G new RAT. The nature of these two states is similar. For LTE RAN and 5G RAN, the light connected state and the inactive state are both sub-states of the RRC connected state. When the terminal is in the light connected state or the inactive state, its RRC connection with the RAN is still maintained, and the signaling bearer and the data bearer are still maintained. However, the difference from the RRC connected state is that the terminal and RAN need to save the terminal context, the terminal mobility adopts the cell reselection method, and the terminal monitors the paging of the RAN and CN.

上述2个新状态的引入可以部分减少终端的耗电以及终端从IDLE(空闲状态)态到连接态的切换次数，从而减少部分信令开销；但并没有对海量连接导致的信令起到本质性的减少。The introduction of the above two new states can partially reduce the power consumption of the terminal and the number of times the terminal switches from the IDLE state to the connected state, thereby reducing some signaling overhead; but it does not essentially reduce the signaling caused by massive connections.

发明内容Summary of the invention

本发明要解决的技术问题是提供一种连接建立方法、存储介质、网元及系统，用以解决现有技术控制面信令开销成本高的问题。The technical problem to be solved by the present invention is to provide a connection establishment method, a storage medium, a network element and a system to solve the problem of high control plane signaling overhead cost in the prior art.

为解决上述技术问题，一方面，本发明提供一种连接建立方法，In order to solve the above technical problems, on the one hand, the present invention provides a connection establishment method.

当收到用户终端B发起的连接请求后，接入网网元确定所述用户终端B所属的终端组；Upon receiving a connection request initiated by user terminal B, the access network element determines the terminal group to which the user terminal B belongs;

接入网网元在所述终端组中确定可进行连接预处理的用户终端；The access network element determines, in the terminal group, a user terminal that can be subjected to connection preprocessing;

接入网网元对确定的用户终端进行连接预处理。The access network element performs connection preprocessing on the determined user terminal.

进一步，所述可进行连接预处理的用户终端为：Further, the user terminal capable of connection preprocessing is:

可进行AS接入层上下文新建的用户终端；或者，A user terminal that can create a new AS access layer context; or,

可进行AS连接预恢复的用户终端。User terminals that can perform AS connection pre-recovery.

进一步，对确定的用户终端进行连接预处理，包括：Further, connection preprocessing is performed on the determined user terminal, including:

根据预先存储的所述终端组中用户终端的AS上下文，对所述确定可进行AS连接预恢复的用户终端预恢复AS连接；或者，Pre-restoring the AS connection of the user terminal determined to be capable of AS connection pre-restoration according to the pre-stored AS context of the user terminal in the terminal group; or,

根据所述终端组的组信息和/或所述终端组内用户终端的信息，对所述可进行AS上下文新建的用户终端建立AS上下文。An AS context is established for the user terminal capable of creating a new AS context according to the group information of the terminal group and/or the information of the user terminals in the terminal group.

进一步，可进行AS连接的预恢复的用户终端是指：在网络侧和终端侧预先均存储有AS上下文的用户终端；Furthermore, the user terminal capable of pre-recovery of AS connection refers to: a user terminal having AS context pre-stored on both the network side and the terminal side;

可进行AS接入层上下文新建的用户终端是指：在网络侧和终端侧未存储AS上下文的用户终端。The user terminal that can create a new AS access layer context refers to a user terminal that does not store an AS context on the network side and the terminal side.

进一步，所述用户终端B发起的连接请求为：连接建立请求、连接恢复请求或者数据传输请求。Furthermore, the connection request initiated by the user terminal B is: a connection establishment request, a connection recovery request or a data transmission request.

进一步，当收到用户终端B发起的连接请求后，接入网网元确定所述用户终端B属于所述终端组，包括：Further, after receiving the connection request initiated by the user terminal B, the access network element determines that the user terminal B belongs to the terminal group, including:

当所述用户终端B使用为所述终端组预分配专用的物理随机接入信道PRACH资源时，则判定所述用户终端B为所述终端组中的用户终端；或者，When the user terminal B uses a physical random access channel PRACH resource pre-allocated specifically for the terminal group, it is determined that the user terminal B is a user terminal in the terminal group; or,

根据所述用户终端B上传的其ID或其所属组的组ID，判定所述用户终端B为所述终端组中的用户终端。According to the ID uploaded by the user terminal B or the group ID of the group to which the user terminal B belongs, it is determined that the user terminal B is a user terminal in the terminal group.

进一步，在所述终端组中确定可进行连接预处理的用户终端，包括：Further, determining the user terminal that can perform connection preprocessing in the terminal group includes:

向核心网网元发送请求，以请求核心网网元确定所述终端组中可进行连接预处理的用户终端；所述请求中包含所述终端组中除用户终端B以外的全部用户终端的ID、终端组的ID或者只包含所述用户终端B的ID；Sending a request to a core network element to request the core network element to determine a user terminal in the terminal group that can perform connection preprocessing; the request includes the IDs of all user terminals in the terminal group except user terminal B, the ID of the terminal group, or only the ID of user terminal B;

根据所述核心网网元反馈的确认指示，得到所述终端组中确定可进行连接预处理的用户终端。According to the confirmation indication fed back by the core network element, the user terminals in the terminal group that are determined to be capable of connection preprocessing are obtained.

进一步，建立AS上下文包括：Furthermore, establishing the AS context includes:

将所述用户终端B的AS上下文中的公共部分作为待建立AS上下文的目标用户终端的AS上下文的公共部分；或者，Using the public part of the AS context of the user terminal B as the public part of the AS context of the target user terminal to establish the AS context; or,

预设一个AS上下文，将预设的AS上下文中的公共部分作为待建立AS上下文的目标用户终端的AS上下文的公共部分；Preset an AS context, and use the common part in the preset AS context as the common part of the AS context of the target user terminal for which the AS context is to be established;

目标用户终端的AS上下文的专有部分则由目标用户终端与网络侧协商建立。The dedicated part of the AS context of the target user terminal is established by negotiation between the target user terminal and the network side.

进一步，所述预恢复AS连接包括：Further, the pre-restoration of the AS connection includes:

将所述终端组中的所有用户终端的上一次AS连接的AS上下文进行保存；Saving the AS context of the last AS connection of all user terminals in the terminal group;

为所述终端组分配终端组恢复ID，或者为所述终端组中每个用户终端分配对应的恢复ID；Allocating a terminal group recovery ID to the terminal group, or allocating a corresponding recovery ID to each user terminal in the terminal group;

建立预恢复AS连接时，根据接收的所述终端组的恢复ID或者用户终端的恢复ID，查找到与其对应的AS上下文；根据该AS上下文预恢复AS连接。When establishing the pre-recovery AS connection, the AS context corresponding to the received recovery ID of the terminal group or the recovery ID of the user terminal is searched; and the AS connection is pre-recovered according to the AS context.

保存所述用户终端B上一次AS连接的AS上下文，并将该AS上下文的公共部分作为所述终端组中所有用户终端的AS上下文的公共部分进行存储；Saving the AS context of the last AS connection of the user terminal B, and storing the common part of the AS context as the common part of the AS context of all user terminals in the terminal group;

进一步，确定所述可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端，包括：Further, determining the user terminal that can create a new AS context or the user terminal that can pre-recover an AS connection includes:

对于所述终端组中的用户终端，将前一次终端组中集中发起连接请求或者连接恢复请求的的用户终端，或者连续发起连接请求或者连接恢复请求的次数超过设定阈值的用户终端，确定为可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端。For user terminals in the terminal group, user terminals that concentratedly initiated connection requests or connection recovery requests in the previous terminal group, or user terminals that continuously initiated connection requests or connection recovery requests more than a set threshold, are determined as user terminals that can create new AS contexts or user terminals that can pre-recover AS connections.

当所述终端组中的用户终端的组数据周期唯一时，将与所述用户终端B的组数据周期以及数据发送时间偏置相符的用户终端，确定为所述可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端；When the group data period of the user terminals in the terminal group is unique, the user terminals that match the group data period and data transmission time offset of the user terminal B are determined as the user terminals that can create new AS contexts or the user terminals that can pre-recover AS connections;

当所述终端组中的用户终端有多种数据周期，则将与所述用户终端B数据周期和数据发送时间偏置相符的用户终端，确定为所述可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端。When the user terminals in the terminal group have multiple data cycles, the user terminals whose data cycles and data transmission time offsets match those of the user terminal B are determined as the user terminals that can create new AS contexts or the user terminals that can pre-recover AS connections.

根据核心网网元指定的可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端名单，或者核心网网元指定的拒绝进行AS上下文新建的用户终端或者拒绝进行AS连接的预恢复的用户终端的用户终端名单，确定所述可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端。The user terminals that can create a new AS context or pre-recovery of AS connection are determined based on the list of user terminals that can create a new AS context or the list of user terminals that can pre-recovery of AS connection specified by the core network network element, or the list of user terminals that refuse to create a new AS context or pre-recovery of AS connection specified by the core network network element.

进一步，所述AS连接的预恢复至少包括：建立信令承载、数据承载和AS安全。Furthermore, the pre-recovery of the AS connection at least includes: establishing a signaling bearer, a data bearer and AS security.

另一方面，本发明提供一种连接建立方法，包括：In another aspect, the present invention provides a connection establishment method, comprising:

核心网网元接收接入网网元发送的决策请求，请求核心网网元针对终端组中的用户终端能否进行AS上下文新建或者AS连接预恢复进行判定；The core network element receives a decision request sent by the access network element, requesting the core network element to determine whether a user terminal in the terminal group can perform new AS context creation or AS connection pre-recovery;

核心网网元针对该请求做出判定，并向接入网网元反馈允许和/或拒绝进行AS上下文新建或者AS连接预恢复的用户终端的列表。The core network element makes a decision on the request, and feeds back to the access network element a list of user terminals that are allowed and/or denied to create new AS contexts or pre-recover AS connections.

进一步，核心网网元针对该请求做出判定之后，还包括：Furthermore, after the core network element makes a determination on the request, the following steps are also included:

对该用户终端进行非接入层NAS上下文新建或者核心网连接预恢复；Create a new non-access layer NAS context or pre-recover a core network connection for the user terminal;

其中，核心网连接预恢复包括，核心网网元根据事先保存的用户终端的核心网上下文恢复所述终端的NAS连接和S1连接，其中S1连接指核心网和RAN之间的连接。The core network connection pre-restoration includes that the core network element restores the NAS connection and S1 connection of the terminal according to the core network context of the user terminal saved in advance, wherein the S1 connection refers to the connection between the core network and the RAN.

进一步，所述决策请求包括待决策的用户终端的ID列表、或者待决策的用户终端所属的预设终端组的组ID。Furthermore, the decision request includes an ID list of user terminals to be decided, or a group ID of a preset terminal group to which the user terminal to be decided belongs.

进一步，所述核心网连接预恢复还包括：Further, the core network connection pre-recovery also includes:

以组为单位将预设终端组的所有用户终端的前一次核心网连接的核心网上下文进行保存，或者，选择所述终端组中的一个用户终端B的前一次核心网连接的核心网上下文进行保存，并将所述用户终端B的核心网上下文存储的公共部分当做终端组所有用户终端的核心网上下文存储的公共部分；Saving the core network context of the previous core network connection of all user terminals in a preset terminal group in groups, or selecting the core network context of the previous core network connection of a user terminal B in the terminal group to save, and using the common part of the core network context storage of the user terminal B as the common part of the core network context storage of all user terminals in the terminal group;

为所述核心网上下文存储分配对应的终端组恢复ID，或者为终端组每个用户终端分配对应的用户终端恢复ID；Allocating a corresponding terminal group recovery ID for the core network context storage, or allocating a corresponding user terminal recovery ID for each user terminal in the terminal group;

当所述用户终端B再一次建立核心网连接时，接收用户终端B或接入网网元发送的终端组的恢复ID或者用户终端B的恢复ID；When the user terminal B establishes a core network connection again, receiving a recovery ID of the terminal group or a recovery ID of the user terminal B sent by the user terminal B or the access network element;

根据终端组的恢复ID或者用户终端B的恢复ID，查询到所述用户终端B对应的核心网上下文存储，根据所述存储的核心网上下文建立所述用户终端B的核心网连接。According to the recovery ID of the terminal group or the recovery ID of the user terminal B, the core network context storage corresponding to the user terminal B is queried, and the core network connection of the user terminal B is established according to the stored core network context.

再一方面，本发明提供一种存储介质，所述存储介质中存储有程序指令，所述程序指令被配置为：In another aspect, the present invention provides a storage medium, wherein program instructions are stored in the storage medium, and the program instructions are configured to:

当收到用户终端B发起的连接请求后，确定所述用户终端B所属的终端组；After receiving a connection request initiated by user terminal B, determining the terminal group to which the user terminal B belongs;

在所述终端组中确定可进行连接预处理的用户终端；Determining a user terminal in the terminal group that can perform connection preprocessing;

对确定的用户终端进行连接预处理。Perform connection preprocessing on the determined user terminal.

进一步，确定所述用户终端B属于所述终端组，包括：Further, determining that the user terminal B belongs to the terminal group includes:

为所述终端组预分配专用的物理随机接入信道PRACH资源之后，当所述用户终端B使用所述专用PRACH资源时，则判定所述用户终端B为所述终端组中的用户终端；或者，After pre-allocating a dedicated physical random access channel PRACH resource for the terminal group, when the user terminal B uses the dedicated PRACH resource, determining that the user terminal B is a user terminal in the terminal group; or,

接收无线接入网接入网网元侧发送的决策请求，请求核心网网元针对终端组中的用户终端能否进行AS上下文新建或者AS连接预恢复进行判定；Receiving a decision request sent by a wireless access network access network element side, requesting a core network element to determine whether a user terminal in a terminal group can perform new AS context creation or AS connection pre-recovery;

针对该请求做出判定，并向接入网网元反馈允许和/或拒绝进行AS上下文新建或者AS连接预恢复的用户终端的列表。A decision is made with respect to the request, and a list of user terminals that are allowed and/or denied to perform new AS context creation or AS connection pre-recovery is fed back to the access network element.

进一步，针对该请求做出判定之后，还包括：Furthermore, after making a decision on the request, the following is also included:

其中，核心网连接预恢复包括，核心网网元根据事先保存的用户终端的核心网上下文恢复所述终端的NAS连接和S1连接，其中S1连接指核心网和接入网网元之间的连接。The core network connection pre-recovery includes that the core network network element recovers the NAS connection and S1 connection of the terminal according to the core network context of the user terminal saved in advance, wherein the S1 connection refers to the connection between the core network and the access network element.

以组为单位将预设终端组的所有用户终端的前一次核心网连接的核心网上下文进行保存，或者，选择所述终端组中的一个用户终端B的前一次核心网连接的核心网上下文进行保存，并将所述用户终端B的核心网上下文存储的公共部分当做终端组所有用户终端的核心网上下文存储的公共部分；Saving the core network context of the previous core network connection of all user terminals in a preset terminal group in groups, or selecting the core network context of the previous core network connection of a user terminal B in the terminal group to save, and treating the common part of the core network context storage of the user terminal B as the common part of the core network context storage of all user terminals in the terminal group;

当所述用户终端B再一次建立核心网连接时，接收用户终端B或RAN发送的终端组的恢复ID或者用户终端B的恢复ID；When the user terminal B establishes a core network connection again, receiving a recovery ID of the terminal group or a recovery ID of the user terminal B sent by the user terminal B or the RAN;

再一方面，本发明提供一种接入网网元，包括处理器和存储器，所述存储器中存储有程序指令，所述处理器通过调用存储器中的所述程序指令，来执行以下操作：In another aspect, the present invention provides an access network element, including a processor and a memory, wherein the memory stores program instructions, and the processor performs the following operations by calling the program instructions in the memory:

再一方面，本发明提供一种核心网网元，包括处理器和存储器，所述存储器中存储有程序指令，所述处理器通过调用存储器中的所述程序指令，来执行以下操作：In another aspect, the present invention provides a core network element, including a processor and a memory, wherein the memory stores program instructions, and the processor performs the following operations by calling the program instructions in the memory:

进一步，针对该决策请求做出判定之后，还包括：Furthermore, after making a determination on the decision request, the following steps are also included:

再一方面，本发明提供一种系统，包括上述接入网网元、核心网网元和用户终端。On the other hand, the present invention provides a system, comprising the above-mentioned access network element, core network element and user terminal.

本发明有益效果如下：The beneficial effects of the present invention are as follows:

本发明基于组的方式，在组内终端发起连接时，对其所属组中的其它终端进行RRC连接的预建立或者预恢复，这样，这些完成了RRC连接的预建立或者预恢复的终端再发起RRC连接建立或者恢复时，就可以快速建立或恢复RRC连接，并且有效降低控制面信令的开销成本。The present invention is based on a group approach. When a terminal in the group initiates a connection, the RRC connection is pre-established or pre-recovered for other terminals in the group to which it belongs. In this way, when these terminals that have completed the pre-establishment or pre-recovery of the RRC connection initiate the establishment or recovery of the RRC connection again, the RRC connection can be quickly established or recovered, and the overhead cost of the control plane signaling is effectively reduced.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

图1是本发明实施例中基于组形式的多终端连接建立方法的流程图。FIG. 1 is a flow chart of a method for establishing a multi-terminal connection based on a group form according to an embodiment of the present invention.

具体实施方式DETAILED DESCRIPTION

以下结合附图以及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不限定本发明。The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

组的概念虽然在3GPP被提出，但目前只运用在以组为单位的寻址、AMBR(Aggregate Maximum Bit Rate，累积最大速率)控制、广播形式的组消息发送、以组为单位的计费等方面，对于控制面信令产生的最大过程(连接建立过程)上，由于这是终端发起的个体离散性行为，无论是时间上还是连接性质上都难以以组的方式一次性实现，因此始终没有被业界关注和解决。Although the concept of group was proposed in 3GPP, it is currently only used in group-based addressing, AMBR (Aggregate Maximum Bit Rate) control, group message sending in broadcast form, and group-based billing. For the largest process (connection establishment process) generated by control plane signaling, since this is an individual discrete behavior initiated by the terminal, it is difficult to achieve it in a group manner at one time in terms of time and connection nature, so it has never been paid attention to or solved by the industry.

本发明的核心方案是：将用户终端进行分组，当终端组中的任一用户终端发起连接请求(连接建立请求、连接恢复请求或者数据传输请求)时，对终端组中剩余的用户终端进行筛选识别，选定可以进行连接预处理的用户终端，针对选定的用户终端在接入网侧和核心网侧进行预连接处理。这样，当已经建立预连接处理的用户终端再次发起连接请求时，直接用预连接的信息来建立连接，这样就会快速建立或恢复RRC连接，并且有效降低控制面信令的开销成本。The core scheme of the present invention is: user terminals are grouped, and when any user terminal in the terminal group initiates a connection request (connection establishment request, connection recovery request or data transmission request), the remaining user terminals in the terminal group are screened and identified, and user terminals that can be pre-processed for connection are selected, and pre-connection processing is performed on the access network side and the core network side for the selected user terminals. In this way, when a user terminal that has established pre-connection processing initiates a connection request again, the pre-connection information is directly used to establish a connection, so that the RRC connection can be quickly established or restored, and the overhead cost of control plane signaling is effectively reduced.

对终端组中剩余的用户终端进行筛选识别，选定可以进行预连接处理的用户终端时，需要核心网侧进行决策时，则核心网网元接收接入网网元RAN侧发送的决策请求，请求核心网网元针对终端组中的用户终端能否进行AS上下文新建或者AS连接预恢复进行判定；核心网网元针对该请求做出判定，并向RAN反馈允许和/或拒绝进行AS上下文新建或者AS连接预恢复的用户终端的列表。The remaining user terminals in the terminal group are screened and identified, and when the user terminals that can be pre-connected are selected, if the core network side needs to make a decision, the core network network element receives the decision request sent by the access network network element RAN side, requesting the core network network element to determine whether the user terminals in the terminal group can perform new AS context creation or AS connection pre-recovery; the core network network element makes a determination based on the request, and feeds back to the RAN a list of user terminals that are allowed and/or denied to perform new AS context creation or AS connection pre-recovery.

基站侧的预连接处理包括：根据预先存储的终端组中用户终端的AS上下文，对确定可进行AS连接预恢复的用户终端预恢复AS连接；或者，根据终端组的组信息和/或所述终端组内用户终端的信息，对可进行AS上下文新建的用户终端建立AS上下文。The pre-connection processing on the base station side includes: pre-restoring the AS connection of the user terminal determined to be capable of AS connection pre-recovery based on the AS context of the user terminal in the pre-stored terminal group; or, establishing an AS context for the user terminal capable of creating a new AS context based on the group information of the terminal group and/or the information of the user terminals in the terminal group.

核心网侧的预连接处理包括：对该用户终端进行非接入层NAS上下文新建或者核心网连接预恢复；其中，核心网连接预恢复包括，核心网网元根据事先保存的用户终端的核心网上下文恢复所述终端的NAS连接和S1连接，其中S1连接指核心网和RAN之间的连接。The pre-connection processing on the core network side includes: creating a non-access layer NAS context for the user terminal or pre-recovering the core network connection; wherein the core network connection pre-recovery includes the core network element recovering the NAS connection and S1 connection of the terminal according to the core network context of the user terminal saved in advance, wherein the S1 connection refers to the connection between the core network and the RAN.

下面通过具体实施例进行详细说明。The following describes it in detail through specific embodiments.

实施例1Example 1

本实施例涉及一种连接建立方法，该方法应用于接入网网元侧，包括：This embodiment relates to a connection establishment method, which is applied to an access network element side and includes:

当收到用户终端B发起的连接请求后，接入网网元首先确定用户终端B所属的终端组；然后在该终端组中确定可进行连接预处理的用户终端；最后对确定的用户终端进行连接预处理。通过上述技术方案，完成了连接预处理的终端再发起连接请求时，就可以快速建立或恢复RRC连接，有效降低控制面信令的开销成本。After receiving a connection request initiated by user terminal B, the access network element first determines the terminal group to which user terminal B belongs; then determines the user terminal that can be pre-processed for connection in the terminal group; and finally performs connection pre-processing on the determined user terminal. Through the above technical solution, when the terminal that has completed the connection pre-processing initiates a connection request again, the RRC connection can be quickly established or restored, effectively reducing the overhead cost of control plane signaling.

本实施例中，确定用户终端B所属的终端组，可以采用以下任一方案：In this embodiment, the terminal group to which the user terminal B belongs may be determined by any of the following solutions:

当用户终端B使用为终端组预分配专用的物理随机接入信道PRACH资源时，则判定用户终端B为终端组中的用户终端；或者，When user terminal B uses a physical random access channel PRACH resource pre-allocated specifically for the terminal group, user terminal B is determined to be a user terminal in the terminal group; or,

根据用户终端B上传的其ID或其所属组的组ID，判定用户终端B为终端组中的用户终端。According to the ID uploaded by the user terminal B or the group ID of the group to which the user terminal B belongs, it is determined that the user terminal B is a user terminal in the terminal group.

上述方案中，用户终端B发起的连接请求可以为连接建立请求、连接恢复请求或者数据传输请求。可进行连接预处理的用户终端为：可进行接入层AS上下文新建的用户终端；或者，可进行AS连接预恢复的用户终端。其中，AS连接的预恢复至少包括：建立信令承载、数据承载和AS安全。In the above scheme, the connection request initiated by user terminal B can be a connection establishment request, a connection recovery request or a data transmission request. The user terminal that can perform connection preprocessing is: a user terminal that can create a new access layer AS context; or a user terminal that can perform AS connection pre-recovery. The AS connection pre-recovery at least includes: establishing a signaling bearer, a data bearer and AS security.

其中，确定可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端，包括：Wherein, determining a user terminal that can create a new AS context or a user terminal that can pre-recover an AS connection includes:

对于终端组中的用户终端，将前一次终端组中集中发起连接请求或者连接恢复请求的的用户终端，或者连续发起连接请求或者连接恢复请求的次数超过设定阈值的用户终端，确定为可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端；或者，For user terminals in the terminal group, user terminals that have initiated connection requests or connection recovery requests in the terminal group in the previous time, or user terminals that have continuously initiated connection requests or connection recovery requests for more than a set threshold, are determined as user terminals that can create new AS contexts or user terminals that can pre-recover AS connections; or,

将终端组中与用户终端B的数据周期以及数据发送时间偏置相符的用户终端，确定为可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端；或者，Determine the user terminal in the terminal group that matches the data cycle and data transmission time offset of the user terminal B as a user terminal that can create a new AS context or a user terminal that can pre-recover an AS connection; or

根据核心网网元指定的可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端名单，或者核心网网元指定的拒绝进行AS上下文新建的用户终端或者拒绝进行AS连接的预恢复的用户终端的用户终端名单，确定可进行AS上下文新建的用户终端或者可进行AS连接的预恢复的用户终端。Determine the user terminals that can create a new AS context or pre-recovery of AS connection based on the list of user terminals that can create a new AS context or pre-recovery of AS connection specified by the core network network element, or the list of user terminals that refuse to create a new AS context or pre-recovery of AS connection specified by the core network network element.

上述方案中，在终端组中确定可进行连接预处理的用户终端，包括：In the above scheme, determining the user terminals that can perform connection preprocessing in the terminal group includes:

向核心网网元发送请求，以请求核心网网元确定终端组中可进行连接预处理的用户终端；请求中包含终端组中除用户终端B以外的全部用户终端的ID、终端组的ID或者只包含用户终端B的ID；Sending a request to a core network element to request the core network element to determine a user terminal in the terminal group that can be connected preprocessed; the request includes the IDs of all user terminals in the terminal group except user terminal B, the ID of the terminal group, or only the ID of user terminal B;

根据核心网网元反馈的确认指示，得到终端组中确定可进行连接预处理的用户终端。According to the confirmation indication fed back by the core network element, the user terminal determined in the terminal group for which connection preprocessing can be performed is obtained.

上述方案中，建立AS上下文包括：In the above solution, establishing the AS context includes:

将用户终端B的AS上下文中的公共部分作为待建立AS上下文的目标用户终端的AS上下文的公共部分；或者，预设一个AS上下文，将预设的AS上下文中的公共部分作为待建立AS上下文的目标用户终端的AS上下文的公共部分；目标用户终端的AS上下文的专有部分则由目标用户终端与网络侧协商建立。The public part of the AS context of user terminal B is used as the public part of the AS context of the target user terminal for which the AS context is to be established; or, an AS context is preset, and the public part of the preset AS context is used as the public part of the AS context of the target user terminal for which the AS context is to be established; the private part of the AS context of the target user terminal is established by negotiation between the target user terminal and the network side.

上述方案中，预恢复AS连接包括：In the above solution, the pre-restoration of AS connection includes:

将终端组中的所有用户终端的上一次AS连接的AS上下文进行保存；为终端组分配终端组恢复ID，或者为终端组中每个用户终端分配对应的恢复ID；建立预恢复AS连接时，根据接收的终端组的恢复ID或者用户终端的恢复ID，查找到与其对应的AS上下文；根据该AS上下文预恢复AS连接；或者，The AS context of the last AS connection of all user terminals in the terminal group is saved; a terminal group recovery ID is assigned to the terminal group, or a corresponding recovery ID is assigned to each user terminal in the terminal group; when establishing a pre-recovery AS connection, the corresponding AS context is found according to the received recovery ID of the terminal group or the recovery ID of the user terminal; the AS connection is pre-recovered according to the AS context; or,

保存用户终端B上一次AS连接的AS上下文，并将该AS上下文的公共部分作为终端组中所有用户终端的AS上下文的公共部分进行存储；为终端组分配终端组恢复ID，或者为终端组中每个用户终端分配对应的恢复ID；建立预恢复AS连接时，根据接收的终端组的恢复ID或者用户终端的恢复ID，查找到与其对应的AS上下文；根据该AS上下文预恢复AS连接。Save the AS context of the last AS connection of user terminal B, and store the common part of the AS context as the common part of the AS context of all user terminals in the terminal group; assign a terminal group recovery ID to the terminal group, or assign a corresponding recovery ID to each user terminal in the terminal group; when establishing a pre-recovery AS connection, find the corresponding AS context based on the received recovery ID of the terminal group or the recovery ID of the user terminal; pre-recover the AS connection based on the AS context.

上述方案中，对确定的用户终端进行连接预处理，具体为：In the above scheme, connection preprocessing is performed on the determined user terminal, specifically:

根据预先存储的终端组中用户终端的AS上下文，对确定可进行AS连接预恢复的用户终端预恢复AS连接；或者，根据终端组的组信息和/或终端组内用户终端的信息，对可进行AS上下文新建的用户终端建立AS上下文。According to the AS context of the user terminal in the pre-stored terminal group, the AS connection is pre-restored for the user terminal determined to be capable of AS connection pre-recovery; or, according to the group information of the terminal group and/or the information of the user terminal in the terminal group, an AS context is established for the user terminal capable of creating a new AS context.

实施例2Example 2

本实施例涉及一种存储介质，该存储介质中存储有程序指令，用于实现实施例1的技术方案，其中，该程序指令用于实现如下功能：This embodiment relates to a storage medium, in which program instructions are stored for implementing the technical solution of Embodiment 1, wherein the program instructions are used to implement the following functions:

实施例3Example 3

本实施例涉及一种接入网网元，包括处理器和存储器，处理器中存储有程序指令，处理器通过调用存储器中存储的程序指令，来实现实施例1的技术方案，其中，该程序指令用于实现如下功能：This embodiment relates to an access network element, including a processor and a memory, wherein program instructions are stored in the processor, and the processor implements the technical solution of Embodiment 1 by calling the program instructions stored in the memory, wherein the program instructions are used to implement the following functions:

实施例4Example 4

本实施例涉及一种连接建立方法，该方法应用于核心网网元侧，包括：This embodiment relates to a connection establishment method, which is applied to a core network element side and includes:

核心网网元接收接入网网元发送的决策请求，请求核心网网元针对终端组中的用户终端能否进行AS上下文新建或者AS连接预恢复进行判定；其中，决策请求包括待决策的用户终端的ID列表、或者待决策的用户终端所属的预设终端组的组ID。The core network network element receives a decision request sent by the access network network element, requesting the core network network element to determine whether a user terminal in a terminal group can create a new AS context or pre-recover an AS connection; wherein the decision request includes an ID list of user terminals to be decided, or a group ID of a preset terminal group to which the user terminal to be decided belongs.

其中，所述核心网连接预恢复还包括：Wherein, the core network connection pre-recovery also includes:

本实施例技术方案对确定进行进行AS上下文新建或者AS连接预恢复的用户终端进行非接入层NAS上下文新建或者核心网连接预恢复，这样，当这些终端发起请求时，再发起连接建立请求时，就可以快速建立或恢复RRC连接，并且有效降低控制面信令的开销成本。The technical solution of this embodiment performs non-access layer NAS context creation or core network connection pre-recovery on the user terminal that is determined to perform AS context creation or AS connection pre-recovery. In this way, when these terminals initiate a request and then initiate a connection establishment request, the RRC connection can be quickly established or restored, and the overhead cost of control plane signaling can be effectively reduced.

实施例5Example 5

本实施例涉及一种存储介质，该存储介质中存储有程序指令，用于实现实施例4的技术方案，其中，该程序指令用于实现如下功能：This embodiment relates to a storage medium, in which program instructions are stored for implementing the technical solution of Embodiment 4, wherein the program instructions are used to implement the following functions:

实施例6Example 6

本实施例涉及一种核心网网元，包括处理器和存储器，处理器中存储有程序指令，处理器通过调用存储器中存储的程序指令，来实现实施例4的技术方案，其中，该程序指令用于实现如下功能：This embodiment relates to a core network element, including a processor and a memory, wherein program instructions are stored in the processor, and the processor implements the technical solution of Embodiment 4 by calling the program instructions stored in the memory, wherein the program instructions are used to implement the following functions:

接收接入网网元发送的决策请求，请求核心网网元针对终端组中的用户终端能否进行AS上下文新建或者AS连接预恢复进行判定；其中，决策请求包括待决策的用户终端的ID列表、或者待决策的用户终端所属的预设终端组的组ID。Receive a decision request sent by an access network element, and request the core network element to determine whether a user terminal in a terminal group can create a new AS context or pre-recover an AS connection; wherein the decision request includes an ID list of user terminals to be decided, or a group ID of a preset terminal group to which the user terminal to be decided belongs.

其中，核心网连接预恢复包括，根据事先保存的用户终端的核心网上下文恢复所述终端的NAS连接和S1连接，其中S1连接指核心网和接入网网元之间的连接。The core network connection pre-restoration includes restoring the NAS connection and S1 connection of the terminal according to the core network context of the user terminal saved in advance, wherein the S1 connection refers to the connection between the core network and the access network elements.

下面，以具体的实施例说明本发明基于组形式的多终端连接建立方法及相关网元设备。The following is a specific embodiment to illustrate the method for establishing multi-terminal connections in a group format and related network element devices of the present invention.

实施例7Example 7

以LTE系统为例，假设在核心网元MME-A(移动性管理实体-A)侧已经预定义了一个终端组A，其中包含10个终端的ID(例如S-TMSI或IMSI)，MME-A下属的eNB已提前从MME-A获取组A的信息，终端B(假设其属于终端组A的一员)发起主叫流程，向MME-A下属的一个eNB(LTE RAN的基站)发起RRC连接建立过程；5分钟后，组A的另一个成员终端D向eNB发起RRC连接恢复过程。Taking the LTE system as an example, assuming that a terminal group A has been predefined on the core network element MME-A (Mobility Management Entity-A) side, which contains the IDs of 10 terminals (such as S-TMSI or IMSI), and the eNB under MME-A has obtained the information of group A from MME-A in advance, terminal B (assuming it is a member of terminal group A) initiates a calling process and initiates an RRC connection establishment process to an eNB (LTE RAN base station) under MME-A; 5 minutes later, another member terminal D of group A initiates an RRC connection recovery process to the eNB.

本例用以说明在新建网络连接过程中，RAN(Radio Access Network，无线接入网)和MME如何以组的形式提前将多个组成员的AS连接和核心网连接提前准备好，并将之用于后续的组成员终端的RRC连接建立过程来减少空口信令开销的。This example is used to illustrate how the RAN (Radio Access Network) and MME prepare the AS connections and core network connections of multiple group members in advance in the form of a group during the process of establishing a new network connection, and use them in the subsequent RRC connection establishment process of the group member terminals to reduce the air interface signaling overhead.

图1中只示出终端B在发起建立RRC连接过程中，为组内其它终端建立RRC连接预恢复的流程(注：AS连接是无线接入网和终端之间的连接的泛称，RRC连接归属于于AS连接)，以及后续组内终端发起RRC连接的建立流程，因此图1没有包括终端B建立RRC连接的流程，并不表示终端B不建立RRC连接，而只是在图1中没有示出。用户终端B发起的连接请求可以为：连接建立请求、连接恢复请求或者数据传输。FIG1 only shows the process of establishing RRC connection pre-recovery for other terminals in the group during the process of initiating RRC connection establishment by terminal B (Note: AS connection is a general term for the connection between the wireless access network and the terminal, and RRC connection belongs to AS connection), as well as the process of establishing RRC connection initiated by the terminals in the group. Therefore, FIG1 does not include the process of establishing RRC connection by terminal B, which does not mean that terminal B does not establish RRC connection, but is just not shown in FIG1. The connection request initiated by user terminal B can be: connection establishment request, connection recovery request or data transmission.

如图1所示，基于组形式的多终端连接建立方法包括：As shown in FIG1 , the method for establishing a multi-terminal connection based on a group form includes:

步骤101：终端B向eNB发起RRC连接建立过程，在RRC连接建立请求消息中上报自己的UE ID(S-TMSI)，本次RRC连接建立原因为MO-data(主叫数据业务)；Step 101: Terminal B initiates an RRC connection establishment process to the eNB, and reports its own UE ID (S-TMSI) in the RRC connection establishment request message. The reason for this RRC connection establishment is MO-data (calling data service);

步骤102：eNB查询终端B是否属于某个组的成员，根据其ID确定其属于组A；由RAN或者核心网网元定义同属一组的成员终端，并分配组ID，组内的成员终端应具有下述相同的特征：相同的业务、相同的业务模型、相同的业务种类、相同的终端类型、或者相同的APN(Access Point Name，接入点名称)。Step 102: eNB queries whether terminal B is a member of a certain group, and determines that it belongs to group A based on its ID; the member terminals belonging to the same group are defined by the RAN or core network element, and a group ID is assigned. The member terminals in the group should have the following common characteristics: the same service, the same service model, the same service type, the same terminal type, or the same APN (Access Point Name).

步骤103：eNB判断是否对组A剩余的其他9个组成员终端进行RRC连接的预恢复；可进行RRC连接预恢复的必要条件是，eNB事先存储了终端的AS上下文，没有存储上下文的终端无法进行RRC连接预恢复，在满足该必要条件的基础上，选择哪些组成员终端进行RRC连接预恢复的判断方法包括：Step 103: the eNB determines whether to perform RRC connection pre-recovery for the remaining 9 group member terminals of group A; the necessary condition for performing RRC connection pre-recovery is that the eNB has stored the AS context of the terminal in advance, and the terminal without the stored context cannot perform RRC connection pre-recovery. On the basis of satisfying the necessary condition, the method for determining which group member terminals to perform RRC connection pre-recovery includes:

根据组成员的活跃度判断：如果前一次组成员的RRC连接中某组成员X没有发起连接，或者连续数次组成员X没有发起RRC连接，则认为该组成员X为不活跃成员，RAN不为该成员预恢复RRC连接；Judging by the activity of group members: If a group member X did not initiate a connection in the previous RRC connection of group members, or group member X did not initiate an RRC connection for several consecutive times, the group member X is considered to be an inactive member, and RAN does not pre-recover the RRC connection for the member;

根据组成员的数据周期判断：如果组成员向RAN上报过自己的数据传输周期信息(数据周期)，或者RAN从MME获取过所述组A的数据传输周期信息，则RAN可根据该信息确定是否需要为该成员预恢复RRC连接；具体为：Judging by the data cycle of the group members: If the group members have reported their own data transmission cycle information (data cycle) to the RAN, or the RAN has obtained the data transmission cycle information of the group A from the MME, the RAN can determine whether it is necessary to pre-recover the RRC connection for the member based on the information; specifically:

如果当前发起连接的UE不符合数据周期以及数据发送时间偏置，则判断这次连接是该UE的个人突发行为，不需要预恢复其他组员的RRC连接；If the UE currently initiating the connection does not meet the data cycle and data transmission time offset, it is determined that this connection is a personal burst behavior of the UE, and there is no need to pre-recover the RRC connection of other group members;

如果组内成员有多种数据周期，则判断哪些组成员的数据周期和数据发送时间偏置与当前发起连接的UE相符，可预恢复相符的组员的RRC连接；If the group members have multiple data cycles, it is determined which group members' data cycles and data transmission time offsets match the UE currently initiating the connection, and the RRC connections of the matching group members can be pre-recovered;

根据MME的反馈判断：若MME-A指定了可预恢复RRC连接的UE名单，eNB根据这些指示来确定可预恢复RRC连接的组成员UE；若MME指定了拒绝预恢复连接的UE名单，eNB不进行所述名单中的UE的RRC预建立或者预恢复；According to the feedback from the MME: if the MME-A specifies a list of UEs that can pre-recover the RRC connection, the eNB determines the group member UEs that can pre-recover the RRC connection according to these instructions; if the MME specifies a list of UEs that refuse to pre-recover the connection, the eNB does not perform RRC pre-establishment or pre-recovery for the UEs in the list;

如果当前发起连接过程的终端B的连接建立原因是MT call(MobileTerminalCall，被叫)，且RAN没有收到过来自MME的给其他组A成员UE的paging，或者没有收到过来自MME的组A的group paging，则认为这次MTcall只是该UE的单独业务，其他组A成员不需要一起预恢复RRC连接；If the connection establishment reason of terminal B that currently initiates the connection process is MT call (Mobile Terminal Call, called party), and RAN has not received paging from MME to other group A member UEs, or has not received group paging of group A from MME, it is considered that this MT call is only a separate service of the UE, and other group A members do not need to pre-recover RRC connections together;

上述方法中，可以选择1种方法来辅助判断，也可以两种或三种方法结合使用，其中MME指示的方法具有最高优先级。即如果eNB自己判断有8个终端可以进行RRC连接预恢复，但MME指示只有其中的5个终端允许进行RRC连接预恢复，那么eNB需要遵守MME的指示。Among the above methods, one method can be selected to assist in the judgment, or two or three methods can be used in combination, among which the method indicated by the MME has the highest priority. That is, if the eNB determines that there are 8 terminals that can perform RRC connection pre-recovery, but the MME indicates that only 5 of them are allowed to perform RRC connection pre-recovery, then the eNB needs to comply with the MME's instructions.

在本例中，假设eNB判定为剩余9个终端中的7个终端进行RRC预恢复。In this example, it is assumed that the eNB determines that 7 terminals out of the remaining 9 terminals perform RRC pre-recovery.

步骤104：eNB将选定可进行RRC预恢复的7个终端的名单发给MME审核，可通过S1口的现有信令携带该名单，例如通过initial UE message发送；也可以新定义一个S1口信令。所述S1口指eNB和MME的接口。注：如果eNB决定对组A剩余的所有终端进行RRC连接预恢复，可以只发送组A的ID给MME。Step 104: The eNB sends the list of seven terminals selected for RRC pre-recovery to the MME for review. The list can be carried by existing signaling of the S1 interface, such as by sending an initial UE message; or a new S1 interface signaling can be defined. The S1 interface refers to the interface between the eNB and the MME. Note: If the eNB decides to perform RRC connection pre-recovery on all the remaining terminals in group A, only the ID of group A can be sent to the MME.

步骤105：MME审核这7个终端是否能够预恢复核心网连接，类似的，能进行核心网连接预恢复的必要条件是MME事先存储了对应终端的核心网上下文，否则，该终端不能进行核心网连接预恢复。在满足该必要条件的基础上，审核的方法也可以参考步骤103的方法，由于eNB和MME算法以及参数的差异，此外MME需要考虑自身的负荷等额外因素，MME的审核结果可能会拒绝部分终端的预建立。在本例中，假设MME只允许6个终端预恢复核心网连接，MME将允许预恢复核心网连接的终端名单反馈给eNB，可通过S1口的现有信令携带该名单，例如通过initial Context Setup Request发送；也可以新定义一个S1口信令。Step 105: MME examines whether these 7 terminals can pre-recover the core network connection. Similarly, the necessary condition for pre-recovery of the core network connection is that MME has stored the core network context of the corresponding terminal in advance. Otherwise, the terminal cannot pre-recover the core network connection. On the basis of meeting this necessary condition, the method of examination can also refer to the method of step 103. Due to the differences in algorithms and parameters between eNB and MME, and the need for MME to consider additional factors such as its own load, the MME's examination result may reject the pre-establishment of some terminals. In this example, assuming that MME only allows 6 terminals to pre-recover the core network connection, MME will feed back the list of terminals allowed to pre-recover the core network connection to eNB. The list can be carried through the existing signaling of the S1 interface, such as sent through the initial Context Setup Request; or a new S1 interface signaling can be defined.

同时，MME开始预恢复所述6个终端的核心网连接，即根据MME事先存储的对应的终端上下文，为每个终端分别恢复S1口控制面承载，S1口用户面承载，NAS安全上下文等。At the same time, the MME starts to pre-recover the core network connections of the six terminals, that is, according to the corresponding terminal contexts pre-stored by the MME, the S1 control plane bearer, S1 user plane bearer, NAS security context, etc. are restored for each terminal.

步骤106：eNB根据MME的名单最终确定可以进行RRC预恢复的终端，并根据eNB存储的各个终端的AS上下文进行所述终端的RRC连接预恢复，其中包括为每个终端分别建立信令承载，数据承载，AS安全上下文等；Step 106: The eNB finally determines the terminals that can perform RRC pre-recovery according to the list of the MME, and performs RRC connection pre-recovery of the terminals according to the AS contexts of the terminals stored in the eNB, including establishing signaling bearers, data bearers, AS security contexts, etc. for each terminal;

注意：在上述步骤中，终端B的RRC连接和NAS连接建立的流程不受影响，与其他终端的RRC连接和核心网连接的预恢复可并行进行。Note: In the above steps, the process of establishing the RRC connection and NAS connection of terminal B is not affected, and the pre-recovery of the RRC connection and core network connection of other terminals can be carried out in parallel.

完成RRC连接预恢复和核心网连接预恢复的终端，从LTE网络侧角度来看属于light connected状态(轻连接状态)；从5G new RAT网络角度来看属于inactive状态(非活动状态)，即终端和网络侧均保存有终端的上下文，终端的移动性采用小区重选方式，终端监听RAN和核心网的寻呼。A terminal that has completed RRC connection pre-recovery and core network connection pre-recovery is in a light connected state from the perspective of the LTE network; it is in an inactive state from the perspective of the 5G new RAT network, that is, both the terminal and the network side save the terminal context, the terminal mobility adopts the cell reselection method, and the terminal monitors the paging of the RAN and the core network.

步骤107：5分钟后，假设组A的成员终端D要发起业务，于是向eNB发起RRC连接建立过程或者RRC连接恢复过程，，在RRC连接建立请求消息或者在RRC连接恢复请求消息中上报自己的UE ID，本次RRC连接建立原因为MO-data(主叫数据业务)；Step 107: 5 minutes later, assuming that member terminal D of group A wants to initiate a service, it initiates an RRC connection establishment process or an RRC connection recovery process to the eNB, and reports its own UE ID in the RRC connection establishment request message or the RRC connection recovery request message. The reason for this RRC connection establishment is MO-data (calling data service);

步骤108：eNB查询该终端D是否已经预恢复过RRC连接，如果是，则直接采用预恢复的RRC连接上下文(或称AS上下文)，为终端D配置RRC连接参数并下发，同时告知MME终端D可以进行连接恢复，告知信息中应包含终端D的ID，告知信息可以携带在现有S1口信令，或者新建一个S1口信令；如果否，则仍按照普通新建RRC连接的流程为终端建立RRC连接；Step 108: the eNB inquires whether the terminal D has pre-recovered the RRC connection. If so, the pre-recovered RRC connection context (or AS context) is directly used to configure the RRC connection parameters for the terminal D and send them down, and at the same time inform the MME that the terminal D can recover the connection. The notification information should include the ID of the terminal D. The notification information can be carried in the existing S1 interface signaling, or a new S1 interface signaling is created; if not, the RRC connection is still established for the terminal according to the normal new RRC connection process;

步骤109：MME收到eNB发送的告知信息后，采用预恢复的核心网连接为终端D传输控制面信令。Step 109: After receiving the notification information sent by the eNB, the MME uses the pre-recovered core network connection to transmit control plane signaling to the terminal D.

实施例8：Embodiment 8:

本实施例应用场景和实施例7相同，其区别在于在确定可进行RRC连接预恢复的终端名单时，除了实施例7所述的由MME进行最终决策之外，还可以采用下述方法：The application scenario of this embodiment is the same as that of Embodiment 7, except that when determining the list of terminals that can perform RRC connection pre-recovery, in addition to the final decision made by the MME as described in Embodiment 7, the following method may also be used:

RAN不进行步骤103，而是直接将组A的用户终端列表发给MME，由MME进行最终决策，确定哪些用户终端可以进行RRC连接预恢复；The RAN does not perform step 103, but directly sends the user terminal list of group A to the MME, and the MME makes the final decision to determine which user terminals can perform RRC connection pre-recovery;

实施例9：Embodiment 9:

本实施例应用场景假设和实施例7相同，区别在于在确定可进行RRC连接预恢复的终端名单时，除了实施例7所述的由MME进行最终决策之外，还可以采用下述方法：The application scenario of this embodiment is assumed to be the same as that of Embodiment 7, except that when determining the list of terminals that can perform RRC connection pre-recovery, in addition to the MME making the final decision as described in Embodiment 7, the following method can also be used:

RAN不进行步骤104、105，而是直接对自己确定的可以进行RRC连接预恢复的组A的用户终端进行RRC连接预恢复；The RAN does not perform steps 104 and 105, but directly performs RRC connection pre-recovery on the user terminals in group A that it has determined can perform RRC connection pre-recovery;

这里进一步分为两种实施方式：This is further divided into two implementation modes:

1、RAN不将所述确定进行RRC连接预恢复的组A的用户终端名单告知MME，这样当后续有预恢复过RRC连接的终端接入网络时，为其新建核心网连接即可；1. The RAN does not inform the MME of the list of user terminals in group A that are determined to perform RRC connection pre-recovery, so that when a terminal that has pre-recovered the RRC connection subsequently accesses the network, a new core network connection can be created for it;

2、RAN将所述确定进行RRC连接预恢复的组A的用户终端名单告知MME，MME对该名单中包括的UE进行核心网连接预恢复；2. The RAN notifies the MME of the list of user terminals in group A for which RRC connection pre-recovery is determined, and the MME performs core network connection pre-recovery for the UEs included in the list;

实施例10：Embodiment 10:

以LTE系统为例，假设在RAN侧已经预定义了一个终端组A，其中包含10个终端的ID(例如S-TMSI或IMSI)，终端B(假设其属于终端组A的一员)发起主叫流程，向eNB(LTE RAN的基站)发起RRC连接建立过程；5分钟后，组A的另一个成员终端D也向eNB发起RRC连接恢复过程。Taking the LTE system as an example, assuming that a terminal group A has been predefined on the RAN side, which contains the IDs of 10 terminals (such as S-TMSI or IMSI), terminal B (assuming it is a member of terminal group A) initiates the calling process and initiates the RRC connection establishment process to the eNB (the base station of the LTE RAN); 5 minutes later, another member terminal D of group A also initiates the RRC connection recovery process to the eNB.

本例用以说明在新建网络连接过程中，RAN如何以组的形式提前将多个组成员的AS连接的部分上下文提前准备好，并将之用于后续的组成员终端的RRC连接建立或者恢复过程来减少空口信令开销以及减少基站的处理能力消耗的。This example is used to illustrate how RAN prepares partial contexts of AS connections of multiple group members in advance in the form of a group during a new network connection, and uses them in the subsequent RRC connection establishment or recovery process of the group member terminals to reduce air interface signaling overhead and reduce the processing power consumption of the base station.

步骤401：终端B向eNB发起RRC连接建立过程，在RRC连接建立请求消息中上报自己的UE ID(S-TMSI)，本次RRC连接建立原因为MO-data(主叫数据业务)；Step 401: Terminal B initiates an RRC connection establishment process to the eNB, and reports its own UE ID (S-TMSI) in the RRC connection establishment request message. The reason for this RRC connection establishment is MO-data (calling data service);

步骤402：eNB查询终端B是否属于某个组的成员，根据其ID确定其属于组A；Step 402: the eNB queries whether terminal B is a member of a certain group, and determines that it belongs to group A according to its ID;

步骤403：eNB判断组A剩余的其他9个组成员终端是否有存储的AS上下文，如果没有，那么只能进行AS上下文新建。在本例中假设eNB没有这9个组成员终端存储的AS上下文，那么eNB进一步确定对哪几个终端进行AS上下文新建，选择方法包括：Step 403: The eNB determines whether the remaining 9 group member terminals of group A have stored AS contexts. If not, then only new AS contexts can be created. In this example, it is assumed that the eNB does not have AS contexts stored by these 9 group member terminals. Then the eNB further determines which terminals to create new AS contexts for. The selection method includes:

根据组成员的活跃度判断：如果前一次组成员的RRC连接中某组成员X没有发起连接，或者连续数次组成员X没有发起RRC连接，则认为该组成员X为不活跃成员，RAN不为该成员新建AS上下文；Judging by the activity of group members: If a group member X did not initiate a connection in the previous RRC connection of group members, or group member X did not initiate an RRC connection for several consecutive times, the group member X is considered to be an inactive member, and RAN does not create a new AS context for the member;

根据组成员的数据周期判断：如果组成员向RAN上报过自己的数据传输周期信息，或者RAN从MME获取过所述组A的数据传输周期信息，则RAN可根据该信息确定是否需要为该成员新建AS上下文；具体为：Determine based on the data cycle of the group members: If the group members have reported their own data transmission cycle information to the RAN, or the RAN has obtained the data transmission cycle information of the group A from the MME, the RAN can determine whether a new AS context needs to be created for the member based on the information; specifically:

如果当前发起连接的UE不符合组数据周期以及数据发送时间偏置，则判断这次连接是该UE的个人突发行为，不需要新建AS上下文；If the UE currently initiating the connection does not meet the group data cycle and data transmission time offset, it is determined that this connection is a personal burst behavior of the UE and no new AS context is required;

如果组内成员有多种数据周期，则判断哪些组成员的数据周期和数据发送时间偏置与当前发起连接的UE相符，可为相符的组员新建AS上下文；If the group members have multiple data cycles, it is determined which group members' data cycles and data transmission time offsets match the UE currently initiating the connection, and a new AS context can be created for the matching group members;

如果当前发起连接过程的终端B的连接建立原因是MT call(Mobile TerminalCall，被叫)，且RAN没有收到过来自MME的给其他组A成员UE的paging，或者没有收到过来自MME的组A的group paging，则认为这次MTcall只是该UE的单独业务，其他组A成员不需要一起新建AS上下文；If the connection establishment reason of the terminal B that currently initiates the connection process is MT call (Mobile Terminal Call, called party), and the RAN has not received paging from the MME to other UEs of group A, or has not received group paging of group A from the MME, it is considered that this MT call is only a separate service of the UE, and other members of group A do not need to create a new AS context together;

上述方法中，可以选择1种方法来辅助判断，也可以两种或三种方法结合使用。Among the above methods, one method can be selected to assist in the judgment, or two or three methods can be used in combination.

在本例中，假设eNB判定为剩余9个终端中的7个终端进行新建AS上下文。In this example, it is assumed that the eNB determines to create new AS contexts for 7 terminals out of the remaining 9 terminals.

步骤404：eNB为选定的终端新建AS上下文，包括下述2种方式：Step 404: the eNB creates a new AS context for the selected terminal, including the following two methods:

1、以当前正在进行连接建立的终端B的AS上下文作为蓝本，进行AS上下文新建；1. Create a new AS context based on the AS context of terminal B that is currently establishing a connection;

2、按照预设的缺省AS上下文作为蓝本，进行AS上下文新建，2. Create a new AS context based on the preset default AS context.

所述AS上下文分为公共部分和专有部分；The AS context is divided into a public part and a private part;

所述公共部分是指可以与其他UE通用的AS上下文部分，在LTE标准中，包括下述一种或者多种：UE安全能力，QoS信息，RAB(无线接入承载)信息，RRC上下文，切换限制列表；其中UE安全能力，Qos信息虽然可能随终端而不同，但是对于有相同特征的同一组终端，上述AS上下文公共部分是可以通用的；The common part refers to the AS context part that can be used with other UEs. In the LTE standard, it includes one or more of the following: UE security capability, QoS information, RAB (radio access bearer) information, RRC context, and switching restriction list; among which, although the UE security capability and QoS information may vary from terminal to terminal, the common part of the AS context can be used for the same group of terminals with the same characteristics;

所述专有部分是指UE自己特有的，与其他UE不同的AS上下文部分，至少包括：AS安全信息，因为AS安全信息需动态更新，因此无法采用其他UE作为参照或者采用固定蓝本进行参照；The proprietary part refers to the AS context part that is unique to the UE and different from other UEs, and at least includes: AS security information. Because the AS security information needs to be dynamically updated, it cannot be used as a reference by other UEs or a fixed blueprint for reference;

所述eNB为选定的终端新建AS上下文实际是指新建AS上下文的公共部分，终端的AS上下文的专有部分需要在终端自行发起RRC连接时进行新建。The newly created AS context by the eNB for the selected terminal actually refers to the public part of the newly created AS context, and the exclusive part of the AS context of the terminal needs to be newly created when the terminal initiates an RRC connection by itself.

步骤405：5分钟后，假设组A的成员终端D要发起业务，于是向eNB发起RRC连接建立过程或者RRC连接恢复过程，在RRC连接建立请求消息或者在RRC连接恢复请求消息中上报自己的UE ID，本次RRC连接建立原因为MO-data(主叫数据业务)；Step 405: 5 minutes later, assuming that member terminal D of group A wants to initiate a service, it initiates an RRC connection establishment process or an RRC connection recovery process to the eNB, reports its own UE ID in the RRC connection establishment request message or the RRC connection recovery request message, and the reason for this RRC connection establishment is MO-data (calling data service);

步骤406：eNB查询该终端D是否已经新建过AS上下文，如果是，则根据所述新建过的上下文建立终端D的上下文的公共部分，此外eNB为终端D重新生成AS上下文的专有部分，例如：将新生成的AS安全信息发送给终端D，与终端D完成AS安全的握手以建立AS安全。Step 406: eNB inquires whether terminal D has created a new AS context. If so, the public part of the context of terminal D is established based on the newly created context. In addition, eNB regenerates the private part of the AS context for terminal D, for example: sending the newly generated AS security information to terminal D, and completing the AS security handshake with terminal D to establish AS security.

实施例11：Embodiment 11:

结合实施例7和实施例10，在步骤103和步骤403中，eNB选择组A剩余终端中哪些终端可以进行RRC连接预恢复或者AS上下文新建时，若剩余终端中一部分在eNB没有事先保存的上下文，一部分在eNB有事先保存的上下文，那么eNB可以选择同时采用两种方法，即对于没有事先保存AS上下文的终端进行AS上下文新建，对于有事先保存AS上下文的终端进行RRC连接预恢复。In combination with Example 7 and Example 10, in step 103 and step 403, when the eNB selects which terminals among the remaining terminals of group A can perform RRC connection pre-recovery or AS context creation, if some of the remaining terminals do not have pre-saved contexts in the eNB, and some have pre-saved contexts in the eNB, then the eNB can choose to use both methods at the same time, i.e., perform AS context creation for terminals that do not have pre-saved AS contexts, and perform RRC connection pre-recovery for terminals that have pre-saved AS contexts.

实施例12：Embodiment 12:

本实施例描述在eNB如何以组为单位进行AS上下文保存和RRC连接恢复，包括：This embodiment describes how to perform AS context preservation and RRC connection recovery in groups in an eNB, including:

以组为单位将所述终端组A的所有用户终端的前一次AS连接的终端AS上下文进行保存，为所述AS上下文存储分配对应的组A恢复ID；或者为所述终端组A中每个用户终端分配对应的恢复ID；Saving the terminal AS context of the previous AS connection of all user terminals of the terminal group A in groups, and assigning a corresponding group A recovery ID to the AS context storage; or assigning a corresponding recovery ID to each user terminal in the terminal group A;

或者，选择所述用户终端B的前一次AS连接的AS上下文进行保存，并将所述用户终端B的AS上下文的公共部分作为所述终端组A中所有用户终端的AS上下文的公共部分进行存储；为所述AS上下文存储分配对应的组A恢复ID；或者为所述终端组A中每个用户终端分配对应的恢复ID；Alternatively, the AS context of the previous AS connection of the user terminal B is selected for saving, and the common part of the AS context of the user terminal B is stored as the common part of the AS context of all user terminals in the terminal group A; a corresponding group A recovery ID is assigned to the AS context storage; or a corresponding recovery ID is assigned to each user terminal in the terminal group A;

当组A中的用户终端B再一次要求建立AS连接时，RAN接收其发送的所述终端组A的恢复ID或者所述用户终端B的恢复ID，根据所述终端组A的恢复ID或者所述用户终端B的恢复ID查询到所述终端B对应的AS上下文存储，根据所述存储的上下文建立所述用户终端B的AS连接。When user terminal B in group A requests to establish an AS connection again, RAN receives the recovery ID of the terminal group A or the recovery ID of the user terminal B sent by it, queries the AS context storage corresponding to the terminal B according to the recovery ID of the terminal group A or the recovery ID of the user terminal B, and establishes the AS connection of the user terminal B according to the stored context.

实施例13：Embodiment 13:

本实施例涉及实现上述实施例的系统，该系统包括接入网网元、核心网网元和用户终端。其中，接入网网元包括存储器(存储介质)和处理器，接入网网元的处理器通过调用接入网网元上的存储器中的程序指令(软件程序)，来实现上述实施例方案中接入网网元的功能。核心网网元包括存储器(存储介质)和处理器，核心网网元的处理器通过调用核心网网元上的存储器中的程序指令(软件程序)，来实现上述实施例方案中核心网网元的功能。存储介质是指存储程序指令数据(软件程序)的物理载体；可以是软盘、光盘、DVD、硬盘、闪存、U盘、CF卡、SD卡、MMC卡、SM卡、记忆棒(Memory Stick)、xD卡等；也可以是包括上述存储产品的设备。其中：The present embodiment relates to a system for implementing the above-mentioned embodiment, which system includes an access network element, a core network element and a user terminal. Among them, the access network element includes a memory (storage medium) and a processor, and the processor of the access network element implements the functions of the access network element in the above-mentioned embodiment by calling the program instructions (software program) in the memory on the access network element. The core network element includes a memory (storage medium) and a processor, and the processor of the core network element implements the functions of the core network element in the above-mentioned embodiment by calling the program instructions (software program) in the memory on the core network element. The storage medium refers to a physical carrier for storing program instruction data (software program); it can be a floppy disk, an optical disk, a DVD, a hard disk, a flash memory, a U disk, a CF card, an SD card, an MMC card, a SM card, a memory stick (Memory Stick), an xD card, etc.; it can also be a device including the above-mentioned storage products. Among them:

一，接入网网元上安装的存储器中保存的程序指令实现如下功能：1. The program instructions stored in the memory installed on the access network element implement the following functions:

二、核心网网元上安装的存储器中存储的程序指令用于实现如下功能：2. The program instructions stored in the memory installed on the core network element are used to implement the following functions:

接收无线接入网RAN侧发送的决策请求，请求核心网网元针对终端组中的用户终端能否进行AS上下文新建或者AS连接预恢复进行判定；Receiving a decision request sent by the radio access network RAN side, requesting the core network element to determine whether a user terminal in the terminal group can perform new AS context creation or AS connection pre-recovery;

核心网网元针对该请求做出判定，并向RAN反馈允许和/或拒绝进行AS上下文新建或者AS连接预恢复的用户终端的列表。The core network element makes a decision on the request and feeds back to the RAN a list of user terminals that are allowed and/or denied to create new AS contexts or pre-recovery of AS connections.

在上述实施例中，接入网网元的类型除了eNB之外，也包括small cell，家庭基站，5G new RAT以及兼容EPC架构的其他接入网网元类型。In the above embodiment, the types of access network elements include, in addition to eNB, small cells, home base stations, 5G new RAT and other access network element types compatible with the EPC architecture.

核心网网元的类型除了MME以外，也包括C-SGN,NBIoT MME等支持机器类型通讯和移动性管理的核心网网元。In addition to MME, core network elements also include C-SGN, NBIoT MME and other core network elements that support machine type communication and mobility management.

本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。It should be understood by those skilled in the art that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

以上所述仅为本发明的优选实施例而已，并非用于限定本发明的保护范围。根据本发明的发明内容，还可有其他多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。尽管为示例目的，已经公开了本发明的优选实施例，本领域的技术人员将意识到各种改进、增加和取代也是可能的，因此，本发明的范围应当不限于上述实施例。The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. According to the content of the invention of the present invention, there may be other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention. Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will realize that various improvements, additions and substitutions are also possible. Therefore, the scope of the present invention should not be limited to the above embodiments.

Claims

1. A connection establishment method, characterized in that,

After receiving a connection request initiated by a user terminal B, an access network element determines a terminal group to which the user terminal B belongs;

the access network element determines a user terminal capable of carrying out connection pretreatment in the terminal group;

the access network element performs connection pretreatment on the determined user terminal;

The user terminal capable of performing connection pretreatment is as follows:

User terminal capable of carrying out access layer AS context creation; or alternatively

User terminal capable of AS connection pre-recovery;

the determining of the user terminal capable of performing AS context creation or the user terminal capable of performing AS connection pre-recovery comprises the following steps:

And determining the user terminal capable of performing AS context creation or the user terminal capable of performing AS connection pre-restoration according to the user terminal list capable of performing AS context creation or the user terminal list capable of performing AS connection pre-restoration designated by the core network element, or the user terminal list capable of rejecting the user terminal capable of performing AS context creation or the user terminal capable of performing AS connection pre-restoration designated by the core network element.

2. The connection establishment method according to claim 1, wherein the connection pre-processing is performed on the determined user terminal, including:

according to the AS context of the user terminal in the terminal group stored in advance, the AS connection of the user terminal which is determined to be capable of performing AS connection pre-recovery is pre-recovered; or alternatively

And establishing the AS context for the user terminal capable of performing AS context establishment according to the group information of the terminal group and/or the information of the user terminal in the terminal group.

3. The connection establishment method according to claim 1, wherein the connection request initiated by the user terminal B is: connection establishment request, connection recovery request, or data transmission request.

4. The connection establishment method according to claim 1, wherein upon receiving a connection request initiated by a user terminal B, the access network element determines that the user terminal B belongs to the terminal group, comprising:

when the user terminal B uses the PRACH resources pre-allocated for the terminal group, judging that the user terminal B is the user terminal in the terminal group; or alternatively

And judging the user terminal B as the user terminal in the terminal group according to the ID of the user terminal B or the group ID of the group to which the user terminal B belongs, wherein the ID is uploaded by the user terminal B.

5. The connection establishment method according to claim 1, wherein determining user terminals in the terminal group that can perform connection preprocessing comprises:

A request is sent to a core network element to request the core network element to determine the user terminal which can be connected and preprocessed in the terminal group; the request contains the IDs of all the user terminals except the user terminal B in the terminal group, the IDs of the terminal group or the IDs of the user terminal B only;

and obtaining the user terminal which is determined to be capable of performing connection pretreatment in the terminal group according to the confirmation indication fed back by the core network element.

6. The connection establishment method of claim 2, wherein establishing the AS context comprises:

taking the public part of the AS context of the user terminal B AS the public part of the AS context of the target user terminal of which the AS context is to be established; or alternatively

Presetting an AS context, and taking a public part in the preset AS context AS a public part of the AS context of a target user terminal for which the AS context is to be established;

The proprietary part of the AS context of the target user terminal is then negotiated and established by the target user terminal with the network side.

7. The connection establishment method of claim 2, wherein the pre-recovery AS connection comprises:

the AS context of the last AS connection of all user terminals in the terminal group is stored;

Distributing a terminal group recovery ID for the terminal group, or distributing a corresponding recovery ID for each user terminal in the terminal group;

When the pre-recovery AS connection is established, the AS context corresponding to the recovery ID of the terminal group or the recovery ID of the user terminal is searched according to the received recovery ID; the AS connection is pre-restored according to the AS context.

8. The connection establishment method of claim 2, wherein the pre-recovery AS connection comprises:

the AS context of the last AS connection of the user terminal B is saved, and the public part of the AS context is used AS the public part of the AS contexts of all the user terminals in the terminal group to be stored;

9. The connection establishment method according to claim 1, wherein determining the user terminal capable of performing AS context creation or the user terminal capable of performing pre-restoration of AS connection comprises:

And for the user terminals in the terminal group, determining the user terminals which intensively initiate the connection request or the connection recovery request in the previous terminal group or the user terminals which continuously initiate the connection request or the connection recovery request for times exceeding a set threshold value AS the user terminals which can perform AS context new establishment or the user terminals which can perform AS connection pre-recovery.

10. The connection establishment method according to claim 1, wherein determining the user terminal capable of performing AS context creation or the user terminal capable of performing pre-restoration of AS connection comprises:

And determining the user terminal which accords with the data period and the data sending time bias of the user terminal B in the terminal group AS the user terminal which can carry out AS context establishment or the user terminal which can carry out AS connection pre-recovery.

11. The connection establishment method of claim 1, wherein the pre-restoration of the AS connection comprises at least: and establishing signaling bearing, data bearing and AS security.

12. A method of connection establishment, comprising:

The method comprises the steps that a core network element receives a decision request sent by an access network element, and the request core network element judges whether AS context creation or AS connection pre-restoration can be carried out for user terminals in a terminal group;

The core network element makes a judgment for the request and feeds back a list of user terminals which allow and/or reject AS context creation or AS connection pre-restoration to the access network element;

the access network element is used for determining a user terminal capable of performing connection pretreatment in the terminal group;

The user terminal capable of performing connection pretreatment is as follows:

User terminal capable of AS connection pre-recovery;

the access network element determining the user terminal capable of performing AS context creation or the user terminal capable of performing AS connection pre-recovery comprises:

13. The connection establishment method of claim 12, wherein after the core network element makes the determination for the request, further comprising:

carrying out non-access stratum (NAS) context new establishment or core network connection pre-recovery on the user terminal;

The core network connection pre-recovery comprises that a core network element recovers NAS connection and S1 connection of a user terminal according to a pre-stored core network context of the terminal, wherein the S1 connection refers to connection between the core network and an access network element.

14. The connection establishment method of claim 12, wherein the decision request includes a list of IDs of user terminals to be decided or a group ID of a preset terminal group to which the user terminals to be decided belong.

15. The connection establishment method of claim 13, wherein the core network connection pre-restoration further comprises:

The method comprises the steps of storing core network contexts connected with a previous core network of all user terminals of a preset terminal group by taking the group as a unit, or selecting and storing the core network context connected with a previous core network of one user terminal B in the terminal group, and taking a public part stored by the core network context of the user terminal B as a public part stored by the core network context of all user terminals of the terminal group;

Distributing corresponding terminal group recovery IDs for the core network context storage, or distributing corresponding user terminal recovery IDs for each user terminal of the terminal group;

When the user terminal B establishes core network connection again, receiving a recovery ID of a terminal group or a recovery ID of the user terminal B, which is sent by the user terminal B or an access network element;

Inquiring the core network context storage corresponding to the user terminal B according to the recovery ID of the terminal group or the recovery ID of the user terminal B, and establishing the core network connection of the user terminal B according to the stored core network context.

16. A storage medium, characterized in that, the storage medium has stored therein program instructions configured to:

After receiving a connection request initiated by a user terminal B, determining a terminal group to which the user terminal B belongs;

Determining user terminals capable of connection pretreatment in the terminal group;

performing connection pretreatment on the determined user terminal;

The user terminal capable of performing connection pretreatment is as follows:

user terminal capable of carrying out AS access layer context creation; or alternatively

User terminal capable of AS connection pre-recovery;

the determining the user terminal capable of performing AS context creation or the user terminal capable of performing AS connection pre-recovery comprises the following steps:

17. The storage medium of claim 16, wherein performing connection pre-processing for the determined user terminal comprises:

18. The storage medium of claim 17, wherein establishing an AS context comprises:

19. A storage medium AS defined in claim 17, wherein the pre-recovery AS connection comprises:

20. A storage medium AS defined in claim 17, wherein the pre-recovery AS connection comprises:

21. A storage medium, characterized in that, the storage medium has stored therein program instructions configured to:

receiving a decision request sent by an access network element side, and requesting a core network element to judge whether AS context establishment or AS connection pre-restoration can be carried out for user terminals in a terminal group;

Making a judgment for the request, and feeding back a list of user terminals which allow and/or reject AS context creation or AS connection pre-recovery to an access network element;

The user terminal capable of performing connection pretreatment is as follows:

User terminal capable of AS connection pre-recovery;

22. The storage medium of claim 21, further comprising, after making the determination for the decision request:

the core network connection pre-recovery comprises the step of recovering NAS connection and S1 connection of the terminal according to the pre-stored core network context of the user terminal, wherein the S1 connection refers to connection between the core network and an access network element.

23. The storage medium of claim 21, wherein the decision request includes a list of IDs of user terminals to be decided, or a group ID of a preset terminal group to which the user terminals to be decided belong.

24. The storage medium of claim 22, wherein the core network connection pre-restoration further comprises:

25. An access network element comprising a processor and a memory, wherein the memory has stored therein program instructions, the processor performing the following by invoking the program instructions in the memory:

performing connection pretreatment on the determined user terminal;

The user terminal capable of performing connection pretreatment is as follows:

User terminal capable of AS connection pre-recovery;

26. The access network element of claim 25, wherein the performing connection pre-processing for the determined user terminal comprises:

27. The access network element of claim 26, wherein establishing the AS context comprises:

28. The access network element of claim 26, wherein the pre-recovery AS connection comprises:

29. The access network element of claim 26, wherein the pre-recovery AS connection comprises:

30. The access network element of claim 25, wherein the pre-restoration of the AS connection comprises at least: and establishing signaling bearing, data bearing and AS security.

31. A core network element comprising a processor and a memory, wherein the memory has stored therein program instructions, the processor performing the following operations by invoking the program instructions in the memory:

Receiving a decision request sent by a wireless access network, and requesting a core network element to judge whether AS context establishment or AS connection pre-restoration can be carried out for user terminals in a terminal group;

The user terminal capable of performing connection pretreatment is as follows:

User terminal capable of AS connection pre-recovery;

32. The core network element of claim 31, further comprising, after making the decision for the decision request:

33. The core network element of claim 31, wherein the core network connection pre-restoration further comprises:

34. A system comprising an access network element according to any one of claims 25 to 30, a core network element according to any one of claims 31 to 33, and a user terminal.