WO2013107216A1 - Td-lte数字集群通信系统及群组业务实现方法 - Google Patents

Td-lte数字集群通信系统及群组业务实现方法 Download PDF

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Publication number
WO2013107216A1
WO2013107216A1 PCT/CN2012/085132 CN2012085132W WO2013107216A1 WO 2013107216 A1 WO2013107216 A1 WO 2013107216A1 CN 2012085132 W CN2012085132 W CN 2012085132W WO 2013107216 A1 WO2013107216 A1 WO 2013107216A1
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Prior art keywords
terminal
group
core network
base station
monitoring
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PCT/CN2012/085132
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English (en)
French (fr)
Inventor
黄杨晖
袁乃华
高红梅
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鼎桥通信技术有限公司
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Publication of WO2013107216A1 publication Critical patent/WO2013107216A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/08—User group management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • the present invention relates to a TD-LTE (Time Division-Long Term Evolution) digital trunking communication system and a group service implementation method, and belongs to the field of trunking communication technologies.
  • TD-LTE Time Division-Long Term Evolution
  • the TD-LTE digital trunking communication system is a private network system based on TD-LTE technology. Similar to the traditional digital trunking communication system that is not implemented by TD-LTE technology, there are important indicators such as the establishment delay of group services. Strict requirements.
  • the air interface standard of the existing public network TD-LTE is mainly for a peer-to-peer unicast communication mechanism and a multimedia broadcast multicast service (Multimedia Broadcast Multicast Service, MBMS) multicast communication mechanism, and the private network is directed to
  • MBMS Multimedia Broadcast Multicast Service
  • the point-to-multipoint half-duplex communication mechanism of the group user is difficult to meet the above-mentioned establishment delay and other index requirements if the TD-LTE prior art standard applied to the public network is simply applied to the private network system.
  • the present invention provides a TD-LTE digital trunking communication system and a group service implementation method for reducing the setup delay of a group service.
  • An aspect of the present invention provides a method for implementing a group service, including:
  • the intercom terminal sends a group establishment request to the core network
  • the core network searches for a monitoring side cell where the corresponding listening terminal is located in the preset tracking area list according to the group establishment request;
  • the core network establishes a lecture resource for the talker terminal, and simultaneously establishes a group resource for the talker side cell and the monitor side cell where the talker terminal is located;
  • the calling terminal grants the right to speak.
  • TD-LTE digital trunking communication system including: a terminal terminal, configured to send a group establishment request to the core network;
  • the core network includes: a searching module, configured to: in the preset tracking area list, search for a monitoring side cell where the corresponding monitoring terminal is located according to the group establishment request; and establish a module, configured to establish a lecture resource for the terminal terminal, and At the same time, a group resource is established for the interpreter side cell and the monitoring side cell where the main terminal is located; and an authorization module is configured to successfully respond to the group resource that is received by the monitoring side base station in the monitoring side cell for the first time. At the time, the terminal is granted the right to speak.
  • the invention realizes the establishment process of the lecture resource and the establishment process of the group resource in parallel, thereby greatly improving the speed of group service establishment and reducing the establishment delay.
  • Embodiment 1 is a flowchart of Embodiment 1 of a method for implementing a group service according to the present invention
  • FIG. 2 is a signaling diagram of the method shown in FIG. 1;
  • FIG. 3 is a detailed flow chart of step 130 in the method of Figure 1;
  • step 140 is a detailed flow chart of step 140 in the method shown in FIG. 1;
  • FIG. 5 is a flowchart of Embodiment 2 of a method for implementing a group service according to the present invention
  • Figure 6 is a signaling diagram of the method shown in Figure 5;
  • Embodiment 7 is a schematic structural diagram of Embodiment 1 of a TD-LTE digital trunking communication system according to the present invention.
  • FIG. 8 is a schematic diagram showing the specific structure of the main terminal 30 in the system shown in FIG. 7;
  • FIG. 9 is a schematic diagram showing the specific structure of the base station 20 in the system shown in FIG. 7;
  • FIG. 10 is a schematic diagram showing the specific structure of the listening terminal 50 in the system shown in FIG. 7;
  • FIG. 1 is a schematic structural diagram of Embodiment 2 of a TD-LTE digital trunking communication system according to the present invention. detailed description
  • FIG. 1 is a flowchart of Embodiment 1 of a group service implementation method according to the present invention.
  • the method in this embodiment mainly introduces a process of establishing a group service.
  • the method includes the following steps: Step 110: The lecture terminal sends a group establishment request to the core network.
  • the intercom terminal may first set a group establishment request (PTT)
  • PTT group establishment request
  • the speaker request is carried in the RRC Connection Setup Complete message and sent to the base station, and then the group base request is carried in the initial UE message to the core. network.
  • the RRC connection setup complete message is a message used when establishing an RRC signaling connection between the talkback terminal and the base station.
  • the interrogation terminal first sends an RRC Connection Request message to the base station, and then the RRC Connection Setup message is sent by the interpreter base station to the intercom terminal. After the establishment is successful, the interrogation terminal Reply to the RRC Connection Setup Complete message.
  • the process of determining the completion of the RRC connection establishment is performed simultaneously with the process of initiating the group establishment request by carrying the group establishment request in the RRC connection setup complete message, and the process of initiating the group establishment request is performed simultaneously, thereby facilitating the further improvement of the group service establishment speed. , reduce build delays.
  • Step 120 The core network searches for a monitoring side cell where the corresponding listening terminal is located in the preset tracking area list according to the group establishment request.
  • the tracking area (refer to: ⁇ ) list records the current location of all mobile terminals that have subscribed to the group. Since the mobile terminal changes position during the mobile process, the tracking area list is continuously Perform real-time updates. Specifically, the core network may first determine, according to the group number of the to-be-established group included in the group establishment request, and the subscription information of the listening terminal, to join the listening terminal of the to-be-established group; Determining, according to the tracking area list, a monitoring side cell where the monitoring terminal is located.
  • Step 130 The core network establishes a talk resource for the talker terminal, and simultaneously establishes a group resource for the talker side cell where the talker terminal is located and the listener side cell.
  • the cell on the side of the talker refers to the cell where the talker terminal is located; and the area on the side of the listener refers to the cell where the listener terminal is located.
  • the core network when establishing the talker resource, the core network first sends an initial Context Setup Request to the talker base station in the talker side cell; thereafter, The base station base station establishes a lecture resource for the host terminal according to the establishment of the lecture resource. The specific process of establishing a group resource will be described later.
  • Step 140 When the core network first receives a group resource establishment success response replied by the monitoring side base station in the listening side cell, the calling network grants the right to speak.
  • the listening base station may be multiple listening side base stations to establish group resources, but as long as there is a supervisor If the listening base station successfully establishes the group resource, the call can be made, so that the calling terminal is granted the right to speak. Thereafter, the user can start speaking by the calling terminal after obtaining the right.
  • the specific process will be introduced in the following content.
  • the three-segment signaling flow shown in the blocks I, II, and III in FIG. 2 are all executed in parallel. It can be seen that the method in this embodiment performs the process of establishing the lecture resource and the process of establishing the group resource in parallel, thereby It greatly improves the speed of group service establishment and reduces the establishment delay. Experiments have shown that the setup delay after using the method described in this embodiment can be less than 300 ms.
  • Step 131 The core network first sends a PTT Initial Context Setup Request to the intercepting base station and the main base station.
  • the number of the monitoring terminals may be multiple, and the monitoring terminals may be dispersed in different monitoring side cells. Therefore, the group establishment request may be sent to multiple monitoring side base stations. Only one listening side base station is taken as an example for description. It should be noted that, if there is also a listening terminal that needs to make a call in the cell in the main speaking side, the cell in the present speaking side is also regarded as a monitoring side cell for processing.
  • Step 132 The monitoring side base station and the main base station send a group paging message carrying an index number of a group resource configuration parameter in a group paging channel (GPCH). .
  • GPCH group paging channel
  • the index number is an identification number assigned in advance for the group resource configuration parameter, and different group resource configuration parameters use different index numbers. Since the data amount of the index number is far less than the data amount of the group resource configuration parameter, the transmission index number is more advantageous than the transmission group resource configuration parameter, which is more advantageous for reducing the occupation of the radio resource and improving the transmission efficiency.
  • Step 133 The listening terminal that receives the group paging message in the listening side cell searches for the group resource configuration parameter saved by the monitoring terminal according to the index number, and receives the group resource in the main body side.
  • the calling terminal of the group paging message searches for the group resource configuration parameter saved by the calling terminal itself according to the index number.
  • the corresponding relationship between the group resource configuration parameter and the index number is pre-stored in the listening terminal and the terminal terminal. Therefore, the corresponding group resource configuration can be found by using the index number. Parameters.
  • Step 134 The monitoring side base station and the monitoring terminal establish the group resource in the listening side cell according to the group resource configuration parameter; the speaking side base station and the calling terminal according to the group resource
  • the configuration parameter establishes the group resource in the main speaking side cell.
  • the group resource may include, for example, a group service channel of a user plane (Group
  • the monitoring base station and the main base station respectively send and receive paging messages on the respective group paging control channel (GPCCH), so that the corresponding monitoring terminal accesses the group to implement notification monitoring. .
  • GPCCH group paging control channel
  • the group resource needs to be established in the main-speaking cell is that: even before the call starts, there is no corresponding monitoring terminal in the main-talking cell, but during the process of the call, the speaker It is also possible that a new listening terminal joins in the side cell. If the group resource is started to be established at this time, the listening terminal newly added to the mobile terminal side cannot access the group in time, thereby increasing the waiting delay of the call; The reason is: The speaker terminal does not always hold the right to speak. Once the call is robbed, the original speaker terminal will become a new monitor terminal. If the group resource is started at this time, the newly generated monitor terminal cannot be connected in time. Into the group, which increases the waiting delay of the call.
  • the group paging message is quickly sent through the group paging channel, and the terminal directly establishes the group resource according to the group configuration parameter after receiving the group paging message.
  • the group resources can be quickly established without the delay introduced by the air interface interaction.
  • Step 141 The core network sends a PTT Speaker Accept message to the main terminal through the base station of the main body, so that the terminal obtains the right to speak.
  • Step 142 The core network sends a PTT Session Indicator message to the listening side base station and the main speaking side base station, respectively.
  • the right voice indication message is used to enable each of the listening side base stations and the main body side base station to know which terminal terminal is occupied by the current voice.
  • Step 143 The monitoring side base station and the main speaking side base station are respectively on respective GCCHs. Broadcast rights usage information.
  • each listening terminal By using the right to occupy information, each listening terminal knows which terminal terminal is occupied by the current speaking right.
  • FIG. 5 is a flowchart of Embodiment 2 of a group service implementation method according to the present invention.
  • the method in this embodiment mainly introduces a power grab process of a group service.
  • the method further includes the following steps after the foregoing step 140. Step,
  • Step 210 The rushing terminal sends a group rush request to the core network.
  • the rushing terminal refers to a listening terminal that wants to obtain the right to call in the group; the group rushing request is actually a group establishing request, but since there is already a speaking terminal at this time, The core network treats the group establishment request from another terminal at this time as a group grab request.
  • the rushing terminal may carry the group rushing request in the RRC connection setup complete message to the suffocating side base station in the suffocating side cell where the smashing terminal is located;
  • the group rush request is carried in the rushing terminal message and sent to the core network.
  • Step 220 The core network compares priorities of the rushing terminal and the calling terminal according to the group rushing request.
  • the priority is the priority information that each terminal is assigned when signing the contract.
  • the core network determines whether to agree to the privilege by comparing the priorities of the rushing terminal and the calling terminal.
  • Step 230 When the priority of the rushing terminal is higher than the priority of the calling terminal, release the speaker resource of the calling terminal, and simultaneously establish a speaker resource for the rushing terminal.
  • the privilege when the priority of the rushing terminal is higher than the priority of the calling terminal, the privilege is privileged; otherwise, the privilege is rejected.
  • the host resource of the main terminal is translated, and the specific process is as shown in block IV in FIG. 6, and at the same time, the lecture resource is established for the power grab terminal, and the specific process is as shown in FIG. Box V is shown
  • Step 240 The network side grants a right of call to the rushing terminal.
  • the specific process is similar to that of FIG. 4, except that the main terminal is replaced with a power-sending terminal, and the base-side base station is replaced with the power-sending base station. Therefore, it will not be repeated.
  • the two signaling processes shown in the blocks IV and V in FIG. 6 are all executed in parallel, and it can be seen that the method in this embodiment performs the process of translating and releasing the lecturer resources for the original speaker terminal by performing in parallel and The process of establishing a lecture resource for the rushing terminal that is to become the new terminal terminal greatly improves the power rush rate in the group service and reduces the power hop delay.
  • the power-off delay after using the method described in this embodiment can be less than 200 ms.
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a TD-LTE digital trunking communication system according to the present invention, to implement the foregoing method.
  • the system includes at least: a core network 10 and a host terminal 30, and may further include a main body Base station 20, monitoring side base station 40 and listening terminal 50; the working principle of the system is as follows:
  • the talk terminal 30 transmits a group establishment request to the core network 10. Specifically, as shown in FIG. 8, the moderator terminal 30 transmits the group establishment request in the RRC connection setup complete message to the talker base station 20 in the talker cell by using the setup request module 31. As shown in FIG. The base station 20 transmits the group establishment request to the core network 10 by using the first-to-transit module 21 to carry the group establishment request.
  • the locating module 11 in the core network 10 searches for the listening side cell where the corresponding listening terminal 50 is located in the preset tracking area list according to the group establishment request, and specifically, may be included according to the group establishment request.
  • the group number of the to-be-established group and the subscription information of the listening terminal determine to join the listening terminal of the group to be established, and then determine the monitoring side cell where the monitoring terminal is located according to the tracking area list;
  • the establishing module 12 establishes a lecture resource for the talker terminal 30, and simultaneously establishes a group resource for the talker side cell and the monitor side cell where the talker terminal 30 is located; when the core network 10 receives the listener side cell for the first time
  • the authorization module 13 grants the right to speak to the intercom terminal 30, and the specific process can be seen in FIG. 4 and related content.
  • the establishment process of the foregoing group resource is as follows:
  • the establishing module 12 sends a group establishment request to the monitoring side base station 40 and the main body side base station 20 respectively; the monitoring side base station 40 sends the group resource configuration in the group paging channel on the monitoring side.
  • Group paging message of the index number of the parameter as shown in FIG. 9, the lecturer
  • the side base station 20 sends a group paging message carrying the index number of the group resource configuration parameter in the group paging channel on the main speaking side by the calling side paging module 22.
  • the monitoring side parameter searching module 51 searches for the group resource configuration parameter saved by the monitoring terminal 50 according to the index number;
  • the side resource establishing module 52 establishes the group resource in the listening side cell according to the group resource configuration parameter.
  • the interrogating side parameter searching module 32 searches for the group resource configuration parameter saved by the monitoring terminal 30 according to the index number; and is configured by the main speaking side resource establishing module 33.
  • the group resource configuration parameter establishes the group resource in the main speaking side cell.
  • the group paging message is quickly sent through the group paging channel, and the terminal directly establishes the group resource according to the group configuration parameter after receiving the group paging message.
  • the group resources can be quickly established without the delay introduced by the air interface interaction.
  • FIG. 11 is a schematic structural diagram of Embodiment 2 of a TD-LTE digital trunking communication system according to the present invention, to implement the foregoing method.
  • the system includes at least: a core network 10 and a host terminal 30, and may further include a main body The base station 20, the power-splitting-side base station 60, and the power-sending terminal 70; since this example mainly introduces the scenario of the power grab, the unrelated devices and modules in FIG. 7 are omitted.
  • the system works as follows:
  • the rushing terminal 70 sends a group rush request to the core network 10.
  • the group rush request is carried in the RRC connection setup complete message and sent to the rush.
  • the power-sending-side base station 60 in the suffocating-side cell in which the right-end terminal is located; the power-sending-side base station 60 carries the group rushing request in the rushing terminal message and sends the request to the core network 10.
  • the comparison module 14 in the core network 10 compares the priority of the rushing terminal 70 and the Talkback terminal 30 according to the group rush request; when the comparison module 14 compares the priority of the rushing terminal 70 When the priority of the talk terminal 30 is higher, the resource release module 15 releases the lecture resource of the talk terminal 30, and at the same time, establishes a talk resource for the power grab terminal 70.
  • the authorization module 13 grants the right to the right of the rushing terminal 70.
  • Specific process and diagram 4 is similar, except that the main terminal 30 is replaced with the power-sending terminal 70, and the base-side base station 20 is replaced with the power-sending base station 60. Therefore, it will not be repeated.
  • the two signaling processes shown in blocks IV and V in FIG. 6 are executed in parallel, and thus, the system described in this embodiment is parallel.
  • the process of releasing the lecture resource for the original talker terminal and the process of establishing the lecture resource for the grab terminal that is to become the new talker terminal greatly improve the power grab speed in the group service and reduce the power delay.
  • the power-off delay after using the system described in this embodiment can be less than 200ms.

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Abstract

本发明提供一种TD-LTE数字集群通信系统及群组业务实现方法。其中方法包括：主讲终端向核心网发送群组建立请求；所述核心网根据所述群组建立请求在预设的跟踪区列表中查找相应监听终端所在的监听侧小区；所述核心网为所述主讲终端建立主讲资源，并同时为所述主讲终端所在的主讲侧小区以及所述监听侧小区建立群组资源；当所述核心网首次收到由所述监听侧小区中的监听侧基站回复的群组资源建立成功响应时，为所述主讲终端授予话权。本发明通过并行执行主讲资源的建立流程和群组资源的建立流程，从而大大提高了群组业务建立的速度，减少了建立时延。

Description

TD-LTE数字集群通信系统及群组业务实现方法 技术领域
本发明涉及一种 TD-LTE ( Time Division-Long Term Evolution, 时分- 长期演进）数字集群通信系统及群组业务实现方法， 属于集群通信技术领 域。 背景技术
TD-LTE数字集群通信系统是基于 TD-LTE技术实现的专网系统， 与 传统的未釆用 TD-LTE技术实现的数字集群通信系统类似，对群组业务的 建立时延等重要指标都有着严格的要求。
然而，现有公网的 TD-LTE的空中接口标准主要是针对点对点的单播 通信机制和多媒体广播组播业务 ( Multimedia Broadcast Multicast Service, 简称： MBMS )的多播通信机制， 而专网是针对群组用户的点对多点的半 双工通信机制，如果仅是简单地将应用于公网的 TD-LTE现有技术标准应 用于专网系统， 则很难满足上述建立时延等指标要求。 发明内容
本发明提供一种 TD-LTE数字集群通信系统及群组业务实现方法， 用 以减少群组业务的建立时延。 本发明一方面提供一种群组业务实现方法， 其中包括：
主讲终端向核心网发送群组建立请求；
所述核心网根据所述群组建立请求在预设的跟踪区列表中查找相应 监听终端所在的监听侧小区；
所述核心网为所述主讲终端建立主讲资源， 并同时为所述主讲终端所 在的主讲侧小区以及所述监听侧小区建立群组资源；
当所述核心网首次收到由所述监听侧小区中的监听侧基站回复的群 组资源建立成功响应时， 为所述主讲终端授予话权。
本发明另一方面提供一种 TD-LTE数字集群通信系统， 其中包括： 主讲终端， 用于向核心网发送群组建立请求；
核心网， 包括： 查找模块， 用于根据所述群组建立请求在预设的跟踪 区列表中查找相应监听终端所在的监听侧小区； 建立模块， 用于为所述主 讲终端建立主讲资源， 并同时为所述主讲终端所在的主讲侧小区以及所述 监听侧小区建立群组资源； 授权模块， 用于当首次收到由所述监听侧小区 中的监听侧基站回复的群组资源建立成功响应时， 为所述主讲终端授予话 权。
本发明通过并行执行主讲资源的建立流程和群组资源的建立流程， 从 而大大提高了群组业务建立的速度， 减少了建立时延。 附图说明
图 1为本发明所述群组业务实现方法实施例一的流程图；
图 2为图 1所示方法的信令图；
图 3为图 1所示方法中的步骤 130的具体流程图；
图 4为图 1所示方法中的步骤 140的具体流程图；
图 5为本发明所述群组业务实现方法实施例二的流程图；
图 6为图 5所示方法的信令图；
图 7为本发明所述 TD-LTE数字集群通信系统实施例一的结构示意 图；
图 8为图 7所示系统中主讲终端 30的具体结构示意图；
图 9为图 7所示系统中主讲侧基站 20的具体结构示意图；
图 10为图 7所示系统中监听终端 50的具体结构示意图；
图 1 1为本发明所述 TD-LTE数字集群通信系统实施例二的结构示意 图。 具体实施方式
图 1为本发明所述群组业务实现方法实施例一的流程图， 本实施例所 述方法主要介绍群组业务的建立过程。 如图所示， 该方法包括如下步骤： 步骤 110, 主讲终端向核心网发送群组建立请求。
具体地， 如图 2中所示， 所述主讲终端可以先将群组建立请求 （PTT Speaker Request )携带于 RRC连接建立完成 ( RRC Connection Setup Complete ) 消息中发送给主讲侧基站， 再由主讲侧基站将该群组建立请求 携带于主讲终端 （ Initial UE Message ) 消息中发送给所述核心网。
其中， 所述 RRC连接建立完成消息是主讲终端与主讲侧基站之间建 立 RRC信令连接时使用的消息。 如图所示， 主讲终端先向主讲侧基站发 送 RRC连接请求 （ RRC Connection Request ) 消息， 然后由主讲侧基站向 主讲终端发送 RRC连接建立（ RRC Connection Setup )消息， 建立成功后， 再由主讲终端回复 RRC连接建立完成消息。 通过将群组建立请求携带于 RRC连接建立完成消息中发送给主讲侧基站， 使得 RRC连接建立完成的 确定过程与发起群组建立请求的过程同时进行， 从而有利于进一步提高群 组业务建立的速度， 减少建立时延。
步骤 120, 所述核心网根据所述群组建立请求在预设的跟踪区列表中 查找相应监听终端所在的监听侧小区。
其中， 所述跟踪区 （ Tracking Area , 简称： ΤΑ )列表中记录了全部已 经签约该群组的移动终端的当前位置， 由于移动终端在移动过程中会发生 位置变化， 因此要不断对跟踪区列表进行实时更新。 具体地， 所述核心网 可以先根据所述群组建立请求中包含的待建立群组的群组号以及所述监 听终端的签约信息确定要加入所述待建立群组的监听终端； 然后再根据所 述跟踪区列表确定所述监听终端所在的监听侧小区。
步骤 130, 所述核心网为所述主讲终端建立主讲资源， 并同时为所述 主讲终端所在的主讲侧小区以及所述监听侧小区建立群组资源。
其中， 所述主讲侧小区是指所述主讲终端所在的小区； 所述监听侧小 区是指所述监听终端所在的小区。 具体地， 如图 2中的方框 I所示， 在建 立主讲资源时， 所述核心网先向所述主讲侧小区中的主讲侧基站发送主讲 资源建立请求 ( Initial Context Setup Request ) ； 此后， 主讲侧基站根据该 主讲资源建立请为所述主讲终端建立主讲资源。 在建立群组资源时的具体 过程将在后续内容进行介绍。
步骤 140, 当所述核心网首次收到由所述监听侧小区中的监听侧基站 回复的群组资源建立成功响应时， 为所述主讲终端授予话权。
如上所述， 可能有多个监听侧基站要建立群组资源， 但只要有一个监 听侧基站成功建立了群组资源， 则可以进行通话， 因此为所述主讲终端授 予话权， 此后， 用户便可以通过获得话权后的主讲终端开始讲话。 具体过 程将在后续内容进行介绍。
图 2中的方框 I、 II和 III所示的三段信令流程均并行执行，由此可见， 本实施例所述方法通过并行执行主讲资源的建立流程和群组资源的建立 流程，从而大大提高了群组业务建立的速度， 减少了建立时延。 实验表明， 釆用本实施例所述方法后的建立时延能够小于 300ms。
以下详细介绍上述步骤 130中所述的群组资源的建立过程， 具体的信 令交互过程如图 2中的方框 II和方框 III所示， 如图 3所示， 包括如下步 骤：
步骤 131 , 所述核心网先向所述监听侧基站及所述主讲侧基站分别发 送群组建立请求 （ PTT Initial Context Setup Request ) 。
由于所述监听终端可能有多个， 而且这些监听终端也有可能分散于不 同的监听侧小区， 因此有可能需要向多个监听侧基站发送所述群组建立请 求， 由于篇幅所限， 本实施例中仅以一个监听侧基站为例进行了说明。 此 处需要说明的是， 如果所述主讲侧小区中也存在需要进行通话的监听终端 时， 则此时的该主讲侧小区也被视为监听侧小区进行处理。
步骤 132, 所述监听侧基站及所述主讲侧基站在各自的群组寻呼信道 ( Group Paging Channel, 简称： GPCH ) 中下发携带有群组资源配置参数 的索引号的群组寻呼消息。
其中， 所述索引号是预先为群组资源配置参数分配的识别编号， 不同 的群组资源配置参数使用不同的索引号。 由于索引号的数据量远远少于群 组资源配置参数的数据量， 因此， 传输索引号比传输群组资源配置参数相 比， 更有利于减少无线资源的占用， 提高传输效率。
步骤 133 , 在所述监听侧小区中接收到所述群组寻呼消息的监听终端 根据所述索引号查找该监听终端自身保存的群组资源配置参数， 在所述主 讲侧小区中接收到所述群组寻呼消息的所述主讲终端根据所述索引号查 找该主讲终端自身保存的群组资源配置参数。
其中， 所述监听终端和所述主讲终端中预先保存有群组资源配置参数 与索引号的对应关系， 因此， 通过索引号可以查找到相应的群组资源配置 参数。
步骤 134, 所述监听侧基站与所述监听终端根据所述群组资源配置参 数在所述监听侧小区建立所述群组资源； 所述主讲侧基站与所述主讲终端 根据所述群组资源配置参数在所述主讲侧小区建立所述群组资源。
具体地， 所述群组资源例如可以包括用户面的群组业务信道（Group
Traffic CHannel, 简称： GTCH )及信令面的群组控制信道 ( Group Control CHannel, 简称： GCCH )等。 此后， 监听侧基站与主讲侧基站分别在各自 的群组寻呼控制信道（ Group Paging Control CHannel, 简称： GPCCH )上 下发寻呼消息， 从而使相应的监听终端接入群组， 以实现通知监听。
此处需要说明的是， 所述主讲侧小区中也需要建立群组资源的一个原 因是： 即便在通话开始前， 主讲侧小区中不存在相应的监听终端， 但在通 话的进行过程中， 主讲侧小区中也有可能有新的监听终端加入， 如果此时 才开始建立群组资源， 则新加入主讲侧小区中的监听终端无法及时接入群 组， 从而增加了通话的等待延时； 另一个原因是： 主讲终端并非永远持有 话权， 一旦话权被抢， 原来的主讲终端也会变成新的监听终端， 如果此时 才开始建立群组资源， 则新产生的监听终端无法及时接入群组， 从而增加 了通话的等待延时。
由此可见， 本实施例在建立群组资源时， 通过群组寻呼信道快速下发 群组寻呼消息， 终端收到群组寻呼消息后直接根据群组配置参数进行群组 资源的建立， 而无需进行网络交互， 因此能被快速建立群组资源， 没有空 口交互引入的时延。
以下详细介绍上述步骤 140中所述的话权授予过程， 如图 4所示， 包 括如下步骤：
步骤 141 , 核心网经主讲侧基站向主讲终端发送话权授予 （PTT Speaker Accept ) 消息， 便主讲终端获得话权。
步骤 142, 所述核心网分别向所述监听侧基站及所述主讲侧基站发送 话权指示 ( PTT Session Indicator ) 消息。
通过该话权指示消息， 使得各监听侧基站与所述主讲侧基站得知当前 的话权被哪个主讲终端占用。
步骤 143 , 所述监听侧基站与所述主讲侧基站分别在各自的 GCCH上 广播话权占用信息。
通过该话权占用信息， 使得各监听终端得知当前的话权被哪个主讲终 端占用。
图 5为本发明所述群组业务实现方法实施例二的流程图， 本实施例所 述方法主要介绍群组业务的抢权过程， 如图所示， 该方法在上述步骤 140 之后进一步包括如下步骤，
步骤 210, 抢权终端向所述核心网发送群组抢权请求。
其中， 所述抢权终端是指在群组中想要获得话权的一个监听终端； 群 组抢权请求实际上也是一种群组建立请求， 只不过由于此时已经存在一个 主讲终端， 因此核心网将此时来自于另一个终端的群组建立请求视为是群 组抢权请求。
具体地， 所述抢权终端可以将群组抢权请求携带于 RRC连接建立完 成消息中发送给该抢权终端所在抢权侧小区中的抢权侧基站； 然后由所述 抢权侧基站将所述群组抢权请求携带于抢权终端消息中发送给所述核心 网。
步骤 220, 所述核心网根据所述群组抢权请求比较所述抢权终端与所 述主讲终端的优先级。
其中， 所述优先级是各个终端在签约时被分配的优先信息， 核心网通 过比较抢权终端与主讲终端的优先级来确定是否同意抢权。
步骤 230, 当所述抢权终端的优先级高于所述主讲终端的优先级时， 释放所述主讲终端的主讲资源， 并同时为所述抢权终端建立主讲资源。
其中， 当所述抢权终端的优先级高于所述主讲终端的优先级时， 则同 意抢权； 否则拒绝抢权。 当核心网同意枪权时， 译放所述主讲终端的主讲 资源， 具体过程如图 6中的方框 IV所示， 并同时为所述抢权终端建立主 讲资源， 具体过程如图 6中的方框 V所示
步骤 240, 所述网络侧为所述抢权终端授予话权。
具体过程与图 4相似， 只是将其中的主讲终端更换为抢权终端， 并相 应将主讲侧基站更换为抢权侧基站即可。 因此不再赘述。
图 6中的方框 IV和 V所示的两段信令流程均并行执行， 由此可见， 本实施例所述方法通过并行执行为原主讲终端译放主讲资源的流程以及 为即将成为新主讲终端的抢权终端建立主讲资源的流程， 从而大大提高了 群组业务中的抢权速度， 减少了抢权时延。 实验表明， 釆用本实施例所述 方法后的抢权时延能够小于 200ms。
图 7为本发明所述 TD-LTE数字集群通信系统实施例一的结构示意 图， 用以实现上述方法， 如图所示， 该系统至少包括： 核心网 10和主讲 终端 30, 还可以包括主讲侧基站 20、 监听侧基站 40和监听终端 50; 该系 统的工作原理如下：
主讲终端 30向核心网 10发送群组建立请求。 具体地， 如图 8所示， 主讲终端 30通过建立请求模块 31将群组建立请求携带于 RRC连接建立 完成消息中发送给所述主讲侧小区中的主讲侧基站 20; 如图 9所示， 该主 讲侧基站 20通过第 ―中转模块 21将所述群组建立请求携带于主讲终端消 息中发送给所述核心网 10。
此后， 核心网 10中的查找模块 11根据所述群组建立请求在预设的跟 踪区列表中查找相应监听终端 50所在的监听侧小区， 具体地， 可以先根 据所述群组建立请求中包含的待建立群组的群组号以及所述监听终端的 签约信息确定要加入所述待建立群组的监听终端， 然后根据所述跟踪区列 表确定所述监听终端所在的监听侧小区； 然后由建立模块 12为所述主讲 终端 30建立主讲资源， 并同时为所述主讲终端 30所在的主讲侧小区以及 所述监听侧小区建立群组资源； 当核心网 10首次收到由所述监听侧小区 中的监听侧基站 40回复的群组资源建立成功响应时， 由授权模块 13为所 述主讲终端 30授予话权， 具体过程可参见图 4及其相关内容。
本实施例的信令交互过程可参见图 2及其相关内容， 图 2中的方框 I、 II和 III所示的三段信令流程均并行执行， 由此可见， 本实施例所述系统 通过并行执行主讲资源的建立流程和群组资源的建立流程， 从而大大提高 了群组业务建立的速度， 减少了建立时延。 实验表明， 釆用本实施例所述 系统后的建立时延能够小于 300ms。
具体地， 上述群组资源的建立过程如下：
所述建立模块 12向所述监听侧基站 40及所述主讲侧基站 20分别发 送群组建立请求； 所述监听侧基站 40在监听侧的群组寻呼信道中下发携 带有群组资源配置参数的索引号的群组寻呼消息； 如图 9所示， 所述主讲 侧基站 20通过主讲侧寻呼模块 22在主讲侧的群组寻呼信道中下发携带有 群组资源配置参数的索引号的群组寻呼消息。
当监听终端 50接收到所述群组寻呼消息时， 如图 10所示， 通过监听 侧参数查找模块 51根据所述索引号查找该监听终端 50自身保存的群组资 源配置参数； 并由监听侧资源建立模块 52根据所述群组资源配置参数在 所述监听侧小区建立所述群组资源。
当主讲终端 30接收到所述群组寻呼消息时， 通过主讲侧参数查找模 块 32根据所述索引号查找该监听终端 30 自身保存的群组资源配置参数； 并由主讲侧资源建立模块 33根据所述群组资源配置参数在所述主讲侧小 区建立所述群组资源。
由此可见， 本实施例在建立群组资源时， 通过群组寻呼信道快速下发 群组寻呼消息， 终端收到群组寻呼消息后直接根据群组配置参数进行群组 资源的建立， 而无需进行网络交互， 因此能被快速建立群组资源， 没有空 口交互引入的时延。
图 11为本发明所述 TD-LTE数字集群通信系统实施例二的结构示意 图， 用以实现上述方法， 如图所示， 该系统至少包括： 核心网 10和主讲 终端 30 , 还可以包括主讲侧基站 20、 抢权侧基站 60和抢权终端 70; 由于 本实例主要介绍抢权的场景， 因此省略了图 7中不相关的设备和模块。 该 系统的工作原理如下：
抢权终端 70在所述主讲终端 30被授予话权之后 , 向所述核心网 10 发送群组抢权请求， 具体地， 将群组抢权请求携带于 RRC连接建立完成 消息中发送给该抢权终端所在的抢权侧小区中的抢权侧基站 60;所述抢权 侧基站 60将所述群组抢权请求携带于抢权终端消息中发送给所述核心网 10。
此后， 核心网 10中的比较模块 14根据所述群组抢权请求比较所述抢 权终端 70与所述主讲终端 30的优先级； 当比较模块 14比较出所述抢权 终端 70的优先级高于所述主讲终端 30的优先级时， 由资源译放模块 15 释放所述主讲终端 30的主讲资源， 并同时为所述抢权终端 70建立主讲资 源。
此后由所述授权模块 13为所述抢权终端 70授予话权。 具体过程与图 4相似， 只是将其中的主讲终端 30更换为抢权终端 70, 并相应将主讲侧 基站 20更换为抢权侧基站 60即可。 因此不再赘述。
本实施例的信令交互过程可参见图 6及其相关内容，图 6中的方框 IV 和 V所示的两段信令流程均并行执行， 由此可见， 本实施例所述系统通过 并行执行为原主讲终端释放主讲资源的流程以及为即将成为新主讲终端 的抢权终端建立主讲资源的流程， 从而大大提高了群组业务中的抢权速 度， 减少了抢权时延。 实验表明， 釆用本实施例所述系统后的抢权时延能 够小于 200ms。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步 骤可以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机 可读取存储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程 序代码的介质。
最后应说明的是： 以上实施例仅用以说明本发明的技术方案， 而非对 其限制； 尽管参照前述实施例对本发明进行了详细的说明， 本领域的普通 技术人员应当理解： 其依然可以对前述各实施例所记载的技术方案进行修 改， 或者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不 使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims

权 利 要 求 书
1、 一种群组业务实现方法， 其特征在于， 包括：
主讲终端向核心网发送群组建立请求；
所述核心网根据所述群组建立请求在预设的跟踪区列表中查找相应 监听终端所在的监听侧小区；
所述核心网为所述主讲终端建立主讲资源， 并同时为所述主讲终端所 在的主讲侧小区以及所述监听侧小区建立群组资源；
当所述核心网首次收到由所述监听侧小区中的监听侧基站回复的群 组资源建立成功响应时， 为所述主讲终端授予话权。
2、 根据权利要求 1所述的方法， 其特征在于， 所述主讲终端向核心 网发送群组建立请求包括：
所述主讲终端将群组建立请求携带于 RRC连接建立完成消息中发送 给所述主讲侧小区中的主讲侧基站；
所述主讲侧基站将所述群组建立请求携带于主讲终端消息中发送给 所述核心网。
3、 根据权利要求 1所述的方法， 其特征在于， 所述核心网根据所述 群组建立请求在预设的跟踪区列表中查找相应监听终端所在的监听侧小 区包括：
所述核心网根据所述群组建立请求中包含的待建立群组的群组号以 及所述监听终端的签约信息确定要加入所述待建立群组的监听终端；
根据所述跟踪区列表确定所述监听终端所在的监听侧小区。
4、 根据权利要求 2所述的方法， 其特征在于， 所述核心网为所述监 听侧小区建立群组资源包括：
所述核心网先向所述监听侧基站及所述主讲侧基站分别发送群组建立请求； 所述监听侧基站及所述主讲侧基站在各自的群组寻呼信道中下发携 带有群组资源配置参数的索引号的群组寻呼消息；
在所述监听侧小区中接收到所述群组寻呼消息的监听终端根据所述 索引号查找该监听终端自身保存的群组资源配置参数， 在所述主讲侧小区 中接收到所述群组寻呼消息的所述主讲终端根据所述索引号查找该主讲 终端自身保存的群组资源配置参数；
所述监听侧基站与所述监听终端根据所述群组资源配置参数在所述 监听侧小区建立所述群组资源； 所述主讲侧基站与所述主讲终端根据所述 群组资源配置参数在所述主讲侧小区建立所述群组资源。
5、 根据权利要求 1所述的方法， 其特征在于， 为所述主讲终端授予 话权之后还包括：
抢权终端向所述核心网发送群组抢权请求；
所述核心网根据所述群组抢权请求比较所述抢权终端与所述主讲终 端的优先级；
当所述抢权终端的优先级高于所述主讲终端的优先级时， 释放所述主 讲终端的主讲资源， 并同时为所述抢权终端建立主讲资源；
所述核心网为所述抢权终端授予话权。
6、 根据权利要求 5所述的方法， 其特征在于， 所述抢权终端向所述 核心网发送群组抢权请求包括：
所述抢权终端将群组抢权请求携带于 RRC连接建立完成消息中发送 给该抢权终端所在的抢权侧小区中的抢权侧基站；
所述抢权侧基站将所述群组抢权请求携带于抢权终端消息中发送给 所述核心网。
7、 一种 TD-LTE数字集群通信系统， 其特征在于， 包括：
主讲终端， 用于向核心网发送群组建立请求；
核心网， 包括：
查找模块， 用于根据所述群组建立请求在预设的跟踪区列表中查 找相应监听终端所在的监听侧小区；
建立模块， 用于为所述主讲终端建立主讲资源， 并同时为所述主 讲终端所在的主讲侧小区以及所述监听侧小区建立群组资源；
授权模块， 用于当首次收到由所述监听侧小区中的监听侧基站回 复的群组资源建立成功响应时， 为所述主讲终端授予话权。
8、 根据权利要求 7所述的系统， 其特征在于：
所述主讲终端包括建立请求模块， 用于将群组建立请求携带于 RRC 连接建立完成消息中发送给所述主讲侧小区中的主讲侧基站；
所述系统还包括主讲侧基站， 该主讲侧基站包括： 第一中转模块， 用 于将所述群组建立请求携带于主讲终端消息中发送给所述核心网。
9、 根据权利要求 8所述的系统， 其特征在于： 所述建立模块用于向所述监听侧基站及所述主讲侧基站分别发送群 组建立请求；
所述监听侧基站用于在监听侧的群组寻呼信道中下发携带有群组资 源配置参数的索引号的群组寻呼消息；
所述主讲侧基站包括主讲侧寻呼模块， 用于在主讲侧的群组寻呼信道 中下发携带有群组资源配置参数的索引号的群组寻呼消息；
所述系统还包括监听终端， 位于所述监听侧小区中， 包括： 监听侧参 数查找模块， 用于当接收到所述群组寻呼消息时， 根据所述索引号查找该 监听终端自身保存的群组资源配置参数； 监听侧资源建立模块， 用于根据 所述群组资源配置参数在所述监听侧小区建立所述群组资源；
所述主讲终端还包括： 主讲侧参数查找模块， 用于当接收到所述群组 寻呼消息时， 根据所述索引号查找该主讲终端自身保存的群组资源配置参 数； 主讲侧资源建立模块， 用于根据所述群组资源配置参数在所述主讲侧 小区建立所述群组资源。
10、 根据权利要求 7所述的系统， 其特征在于：
所述系统还包括抢权终端， 用于在所述主讲终端被授予话权之后， 向 所述核心网发送群组抢权请求；
所述核心网还包括：
比较模块， 用于根据所述群组抢权请求比较所述抢权终端与所述 主讲终端的优先级；
资源释放模块， 用于当比较模块比较出所述抢权终端的优先级高 于所述主讲终端的优先级时， 释放所述主讲终端的主讲资源， 并同时 为所述抢权终端建立主讲资源；
所述授权模块还用于为所述抢权终端授予话权。
11、 根据权利要求 10所述的系统， 其特征在于：
所述抢权终端用于将所述群组抢权请求携带于 RRC连接建立完成消 息中发送给该抢权终端所在的抢权侧小区中的抢权侧基站；
所述系统还包括抢权侧基站， 用于将所述群组抢权请求携带于抢权终 端消息中发送给所述核心网。
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