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WO2011160469A1 - 一种实现集群通信的方法及系统 - Google Patents

一种实现集群通信的方法及系统 Download PDF

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Publication number
WO2011160469A1
WO2011160469A1 PCT/CN2011/071494 CN2011071494W WO2011160469A1 WO 2011160469 A1 WO2011160469 A1 WO 2011160469A1 CN 2011071494 W CN2011071494 W CN 2011071494W WO 2011160469 A1 WO2011160469 A1 WO 2011160469A1
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Prior art keywords
cluster
base station
terminal
communication mode
communication
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PCT/CN2011/071494
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English (en)
French (fr)
Inventor
郄小丹
张现周
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/52Allocation or scheduling criteria for wireless resources based on load

Definitions

  • the present invention relates to a trunking communication technology, and more particularly to a method and system for implementing cluster communication. Background technique
  • the trunked communication system is a dedicated wireless communication system developed for industry-specific applications to meet the needs of industry users.
  • a large number of wireless users share a small number of wireless channels, and the command and dispatch is the main application. It is a versatile and high-performance wireless communication system.
  • the trunking communication system has a wide application market in the fields of government departments, public safety, emergency telecommunications, electric power, civil aviation, petrochemicals and military.
  • Unicast is peer-to-peer communication
  • multicast is point-to-multipoint communication.
  • Unicast communication has a good user experience for quality of service and timely response.
  • the quality of the service can be improved by ensuring the quality of the call while ensuring resource conservation.
  • a method for implementing cluster communication including:
  • the base station presets a communication mode selection policy
  • the clustering base station selects a policy according to the communication mode, and selects unicast or multicast mode for communication.
  • the communication mode selection policy is set according to the situation of the base station.
  • the communication mode selection policy is: when the base station load exceeds a preset threshold, the communication mode is a multicast mode, and when the base station load is lower than a preset threshold, the communication mode is a unicast mode.
  • the selecting the policy according to the communication mode and selecting the unicast or multicast mode for the communication includes: the base station querying the load situation, and if the current load result is lower than the preset threshold, the terminal in the trunk call is in the call.
  • the service selection uses the unicast communication mode to communicate; if the current load result exceeds the preset threshold, the terminal in the trunk call selects the multicast communication mode to communicate in the call service;
  • the cluster base station periodically sends a cluster page in the cell, and the paging message carries a communication mode flag indicating whether the unicast mode or the multicast mode is used;
  • the base station performs communication for allocating resources for the call service of the terminal in the trunk call according to the selected communication mode.
  • the selected communication mode is a unicast communication mode; and the allocating resources for the call service of the terminal according to the selected communication mode includes:
  • the terminal that receives the paging of the cluster establishes a connection with the base station and the core network respectively, and the base station establishes an instance for each terminal; the core network forwards the received uplink cluster data to each instance, and then each instance separately Send to the corresponding called terminal for communication.
  • the selected communication mode is a multicast communication mode; and the allocating resources for the call service of the terminal according to the selected communication mode includes:
  • the cluster base station establishes a cluster instance for the cluster terminal, and the core network sends the received uplink cluster data to the established cluster instance, and then the cluster instance sends the data to the cluster terminal for communication.
  • the preset threshold is a load value, or a load percentage value, or a number of users that can be accommodated on the network side.
  • a system for implementing cluster communication comprising at least a base station, and a plurality of terminals participating in the cluster communication, wherein
  • the terminal includes a calling terminal and a called terminal group composed of at least one terminal, and is used to initiate a trunking call, and the calling terminal and the called terminal group communicate according to the unicast or multicast mode selected by the base station.
  • the communication mode selection strategy is: when the base station load exceeds a preset threshold, the communication mode is multicast mode communication, and when the base station load is lower than a preset threshold, the communication mode is unicast communication.
  • the base station is specifically configured to:
  • the base station receives the cluster call from the terminal side to query the load situation.
  • the terminal determines that the terminal in the trunk call selects the unicast communication mode in the call service.
  • the cluster base station periodically sends a cluster page in the cell,
  • the paging message carries a communication mode flag indicating whether the unicast mode or the multicast mode is used;
  • the base station performs communication for allocating resources for the call service of the terminal in the trunk call according to the selected communication mode.
  • the system also includes a core network
  • the selected communication mode is a unicast communication mode
  • the terminal that receives the paging of the cluster is specifically configured to establish a connection with the base station and the core network to which the node belongs.
  • the base station is further configured to establish an instance for each terminal separately;
  • the core network After receiving the uplink cluster data, the core network forwards the received uplink cluster data to each instance, and then sends each instance to the corresponding called terminal.
  • the selected communication mode is a multicast communication mode
  • the cluster base station is further configured to establish a cluster instance for the cluster terminal;
  • the core network is configured to receive uplink cluster data, forward the received uplink cluster data to the established cluster instance, and then send the data to the cluster terminal by the cluster instance.
  • the base The station selects a policy according to the communication mode, and selects unicast or multicast mode for communication.
  • the unicast communication mode is selected; and when the base station is heavily loaded (the current load result exceeds the preset threshold), the selection is used.
  • Multicast communication method The invention combines the unicast and multicast communication modes well, so that the respective advantages of the two are fully embodied in the cluster system. The method of the invention not only ensures the communication quality to the greatest extent, but also saves the system resources under the condition of high system load, improves the system capacity, thereby improving the service quality and ensuring the user experience.
  • FIG. 1 is a flowchart of a method for implementing cluster communication according to the present invention
  • FIG. 2 is a schematic structural diagram of a system for implementing cluster communication according to the present invention.
  • FIG. 3 is a flowchart of a first embodiment of a method for implementing trunking communication according to the present invention
  • FIG. 4 is a flow chart of a second embodiment of a method for implementing trunking communication according to the present invention. detailed description
  • FIG. 1 is a flowchart of a method for implementing trunking communication according to the present invention. As shown in FIG. 1, the method includes: Step 100: A base station presets a communication mode selection policy.
  • the communication mode selection policy is set according to the situation of the base station. For example, when the base station load condition is set, the communication mode selection strategy is: when the base station load level exceeds a certain threshold, the communication mode is multicast mode, when the load is When the degree is lower than a certain threshold, the communication mode is unicast.
  • the preset threshold may be a load value, or a load percentage value, or a number of users that can be accommodated on the network side.
  • Step 101 When the terminal initiates a trunking call, the clustering base station selects a policy according to the communication mode, and selects a unicast or multicast mode for communication.
  • the base station to which each cluster terminal in the cluster group call belongs is also referred to as a cluster base station.
  • the specific implementation of this step generally includes:
  • the terminal when the terminal initiates a trunking call, it establishes a connection with the base station and the core network.
  • the core network receives the initial UE context message, it finds that the current call is a cluster call, triggers the cluster paging, and initiates a cluster search to the cluster base station. call.
  • the specific implementation belongs to the prior art, and the implementation method thereof is not used to limit the scope of the present invention.
  • the cluster base station After receiving the paging of the cluster, the cluster base station assumes that the cluster base station selects a communication mode according to the load condition, and then the cluster base station queries the load condition. If the current load result is lower than the preset threshold, the terminal in the trunk call In the call service selection, the unicast communication mode is used for communication; if the current load result exceeds the preset threshold, the terminal in the trunk call selects the multicast communication mode to communicate in the call service; A cluster instance is set up immediately after the paging of the cluster, and the cluster page is periodically sent in the cell.
  • the paging message carries a communication mode flag indicating whether the mode is unicast or multicast.
  • the base station allocates resources for the call service of the terminal in the trunking call according to the selected communication mode, and then performs communication: if the communication mode flag is displayed in the multicast mode, the core network receives the uplink cluster data, and then uplinks the cluster.
  • the data is forwarded to the cluster instance of all the cluster base stations (that is, the cluster instance established immediately after the cluster base station receives the cluster paging), and then the cluster instance sends the data to the cluster terminal (the called terminals participating in the cluster communication);
  • the terminal is configured to display the connection to the base station and the core network, and the base station establishes an instance for each terminal.
  • the core network After receiving the uplink cluster data, the core network forwards the uplink cluster data to each base station.
  • the instances built by the called terminal under its jurisdiction are respectively sent to their corresponding called terminals.
  • the unicast communication mode is adopted; and when the base station is heavily loaded (the current load result exceeds the preset threshold), Use multicast communication.
  • the method of the invention not only ensures the communication quality to the greatest extent, but also saves the system resources under the condition of high system load, improves the system capacity, thereby improving the service quality and ensuring the user experience.
  • a system for implementing cluster communication is provided. As shown in FIG. 2, at least a base station and a plurality of terminals are included, where
  • the base station where the communication mode selection policy is set; is used for receiving the cluster call initiated by the terminal, selecting a policy according to the communication mode, and selecting the unicast or multicast mode for communication.
  • the base station to which each cluster terminal in the cluster group belongs is also referred to as a cluster base station.
  • the terminal includes a calling terminal and a called terminal group composed of at least one terminal, and is used to initiate a trunking call, and the calling terminal and the called terminal group communicate according to the unicast or multicast mode selected by the base station.
  • the communication mode selection strategy is as follows: When the load level exceeds the preset threshold, the communication mode is multicast mode communication, and when the base station load level is lower than the preset threshold, the communication mode is unicast mode. Communication.
  • FIG. 3 is a flowchart of a first embodiment of a method for implementing trunking communication according to the present invention.
  • the terminal 1 initiates a trunking call
  • the terminal 2 is a called terminal in the cluster group
  • the threshold value when the base station load is lower than the load threshold, is called light load.
  • the base station load exceeds the load threshold, it is called heavy load.
  • the base station to which each cluster terminal in the cluster group belongs is also referred to as a cluster base station. As shown in Figure 3, the following steps are included:
  • Step 300 The terminal 1 initiates a trunk call, and the terminal 1 sends a random access request message to the base station.
  • Step 302 The terminal 1 sends a radio link control (RRC) setup request message on the uplink resource allocated thereto.
  • RRC radio link control
  • Step 303 The base station returns an RRC setup message to the terminal 1.
  • Step 304 After receiving the RRC setup message, the terminal 1 sends an RRC setup complete message to the base station.
  • the RRC setup complete message carries the non-access stratum message, and the non-access stratum message includes the cluster number information.
  • Step 305 The base station receives an RRC setup complete message, and sends an initial terminal (UE) to the core network. Context message.
  • Step 306 The core network receives the initial UE context message, finds that the current call is a trunked call, establishes a cluster call instance, triggers the cluster paging, and transmits a cluster bearer setup request message to the cluster base station, and simultaneously sends a base UE context message to the base station. Send back a UE context setup request message.
  • Step 307 The base station receives the UE context setup request message, and sends an RRC reconfiguration message to the terminal 1.
  • Step 308 The terminal 1 receives the RRC reconfiguration message and sends an RRC reconfiguration response message.
  • Step 309 The base station receives the RRC reconfiguration response message, and sends an initial UE context establishment request response message to the core network.
  • Steps 310 to 312 The cluster base station receives the cluster paging, and queries the self-load situation. If the load is heavy at this time, the multicast communication is selected. At the same time, the cluster paging is periodically sent in the cell, and The cluster paging message carries a communication mode flag indicating that the multicast mode is used.
  • Step 313 to step 314 The cluster base station receives the cluster bearer setup request message of the core network, establishes a cluster instance, and sends a cluster bearer setup response message to the core network.
  • Step 315 to Step 317 The core network receives the uplink cluster data, forwards the uplink cluster data to the cluster instance established by the cluster base station, and then sends the data to the terminal 2 by the cluster instance.
  • the terminal 1 and the terminal 2 communicate by means of multicast communication.
  • the steps 307 to 309, and the execution of the steps 310 to 312 and the steps 313 to 314 are not strictly sequential.
  • FIG. 4 is a flowchart of a second embodiment of a method for implementing trunking communication according to the present invention.
  • the terminal 1 initiates a cluster call
  • the terminal 2 is a called terminal in the cluster group
  • the threshold value when the base station load is lower than the load threshold, is called light load.
  • the base station load exceeds the load threshold, it is called heavy load.
  • the base station to which each cluster terminal in the cluster group belongs is also referred to as a cluster base station. As shown in Figure 4, the following steps are included:
  • Step 400 The terminal initiates a trunking call, and the terminal 1 sends a random access request message to the base station.
  • Step 402 The terminal 1 sends an RRC setup request message on the allocated uplink resource.
  • Step 403 The base station returns an RRC setup message to the terminal 1.
  • Step 404 After receiving the RRC setup message, the terminal 1 sends an RRC setup complete message to the base station, where the RRC setup complete message carries the non-access stratum message, and the non-access stratum message includes the cluster number information.
  • Step 405 The base station receives the RRC setup complete message, and sends an initial UE context message to the core network.
  • Step 406 The core network receives the initial UE context message, finds that the current call is a cluster call, establishes a cluster call instance, triggers the cluster paging, sends a cluster bearer setup request message to the cluster base station, and simultaneously sends a cluster UE setup message to the base station. An initial UE context setup request message is sent.
  • Step 407 The base station receives an initial UE context setup request message, and sends an RRC reconfiguration message to the terminal 1.
  • Step 408 The terminal 1 receives the RRC reconfiguration message and returns an RRC reconfiguration response message to the base station.
  • Steps 410 to 412 The cluster base station receives the cluster paging, and queries the load status of the cluster. It is assumed that the load is light at this time, and the unicast mode is selected to communicate, and the cluster paging is periodically sent in the cell, and the paging message is sent. Carry a communication mode flag indicating that the unicast mode is used.
  • Step 413 to step 414 The cluster base station receives the cluster bearer setup request message of the core network, establishes a cluster instance, and returns a cluster bearer setup response message to the core network.
  • Step 415 to step 425 After receiving the page carrying the communication mode flag indicating that the unicast mode is used, the terminal 2 sends a random access request message to the base station;
  • the base station replies to the random access response, and carries the assigned to the terminal 2 in the random access response.
  • the terminal 2 sends an RRC setup request message on the allocated uplink resource; the base station returns an RRC setup message to the terminal 2; after receiving the RRC setup message, the terminal 2 sends an RRC setup complete message to the base station, and the base station receives the RRC setup complete message.
  • the core network sends an initial UE context setup request message to the base station to establish an instance for the terminal 2; after receiving the initial UE context setup request message, the base station sends the initial UE context setup request message to the terminal 2 Sending an RRC reconfiguration message; the terminal 2 receives the RRC reconfiguration message, and returns an RRC reconfiguration response message; the base station receives the RRC reconfiguration response message, and returns a UE context establishment request response message to the core network.
  • Step 426 to step 428 The core network receives the uplink cluster data, and forwards the uplink cluster data to the instance established by the terminal 2 to which the terminal 2 belongs, and then sends the instance to the called terminal 2.
  • steps 407 to 409, and steps 410 to 412, and steps 413 to 414 are not strictly sequential.

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Abstract

本发明提供了一种实现集群通信的方法及系统,当终端发起集群呼叫时,基站根据通信方式选择策略,选择单播或组播方式进行通信。特别地,当基站负荷较轻(当前负荷结果低于预设阈值)时,选择采用单播通信方式;而当基站负荷较重(当前负荷结果超过预设阈值)时,选择采用组播通信方式。本发明将单播和组播两种通信方式良好的结合起来,使得两者各自的优势在集群系统中得到了充分体现。通过本发明方法,既在最大程度上保障了通信质量,又在系统高负荷的情况下节约了系统资源,提高了系统容量,从而提高了服务质量,保证了用户体验。

Description

一种实现集群通信的方法及系统 技术领域
本发明涉及集群通信技术, 尤指一种实现集群通信的方法及系统。 背景技术
集群通信系统是为了满足行业用户指挥需求而开发的、 面向特定行业 应用的专用无线通信系统。 在集群通信系统中, 大量无线用户共享少量无 线信道, 以指挥调度为主体应用, 是一种多用途、 高效能的无线通信系统。 集群通信系统在政府部门、 公共安全、 应急通信、 电力、 民航、 石油化和 军队等领域有着广泛的应用市场。
单播是点对点的通信, 组播是点对多点的通信。 单播通信对于服务质 量, 及时响应方面具有良好的用户体验。
目前, 集群通信中釆用组播方式, 通过釆用专用的共享信道, 节约了 系统资源。 但是, 由于所有集群终端共用同一信道, 数据传输上难免会受 到干扰, 当网络侧负荷大时, 这种干扰会变得比较严重, 从而影响了通话 质量, 降低了服务质量。 发明内容
有鉴于此, 本发明的主要目的在于提供一种实现集群通信的方法及系 统。 能够在保证节约资源的前提下, 保证通话质量, 从而提高服务质量。
为达到上述目的, 本发明的技术方案是这样实现的:
一种实现集群通信的方法, 包括:
基站预先设置通信方式选择策略;
当终端发起集群呼叫时, 集群基站根据通信方式选择策略, 选择单播 或组播方式进行通信。 所述通信方式选择策略根据基站情况设置。
所述通信方式选择策略为: 当基站负荷超过预设阔值时, 通信方式为 组播方式, 当基站负荷低于预设阔值时, 通信方式为单播方式。
所述根据通信方式选择策略, 选择单播或组播方式进行通信包括: 所述基站查询负荷情况, 如果当前负荷结果低于预设阔值时, 则所述 集群呼叫中的终端在此次呼叫业务选择釆用单播通信方式进行通信; 如果 当前负荷结果超过预设阔值, 则所述集群呼叫中的终端在此次呼叫业务选 择釆用组播的通信方式进行通信;
所述集群基站周期性在小区中发送集群寻呼, 寻呼消息中携带用于表 示是单播方式还是多播方式的通信方式标志;
所述基站根据选出的通信方式, 为集群呼叫中的终端的呼叫业务分配 资源后进行通信。
所述选择出的通信方式为单播通信方式; 所述根据选出的通信方式, 为终端的呼叫业务分配资源包括:
所述收到集群寻呼的终端分别与基站和核心网建立连接, 基站分别为 各自的终端建立实例; 核心网将收到的上行集群数据分别转发给所建的各 实例, 再由各实例分别发送给对应的被叫终端, 以进行通信。
所述选择出的通信方式为组播通信方式; 所述根据选出的通信方式, 为终端的呼叫业务分配资源包括:
集群基站为集群终端建立集群实例, 核心网将收到的上行集群数据发 给建立的集群实例, 再由集群实例将数据发送给集群终端, 以进行通信。
所述预设阔值为负荷值, 或负荷百分比值, 或网络侧能容纳的用户数。 一种实现集群通信的系统, 至少包括基站, 以及参与集群通信的多个 终端, 其中,
基站, 其中设置有通信方式选择策略; 用于接收到终端侧发起集群呼 叫, 根据通信方式选择策略, 选择单播或组播方式进行通信; 终端, 包括主叫终端和有至少一个终端组成的被叫终端组, 用于发起 集群呼叫, 主叫终端与被叫终端组之间按照基站选择出的单播或组播方式 进行通信。
所述通信方式选择策略为: 当基站负荷超过预设阔值时, 通信方式为 组播方式通信, 当基站负荷低于预设阔值时, 通信方式为单播方式通信。
所述基站, 具体用于:
所述基站接收到终端侧发起集群呼叫, 查询负荷情况, 在当前负荷结 果低于预设阔值时, 则确定为所述集群呼叫中的终端在此次呼叫业务选择 釆用单播通信方式进行通信; 在当前负荷结果超过预设阈值, 确定为所述 集群呼叫中的终端在此次呼叫业务选择釆用组播的通信方式进行通信; 所述集群基站周期性在小区中发送集群寻呼, 寻呼消息中携带用于表 示是单播方式还是多播方式的通信方式标志;
所述基站根据选出的通信方式, 为集群呼叫中的终端的呼叫业务分配 资源后进行通信。
所述系统还包括核心网;
所述选择出的通信方式为单播通信方式;
所述收到集群寻呼的终端, 具体用于分别与其所属基站和核心网建立 连接,
所述基站, 还用于分别为各自的终端建立实例;
核心网, 用于接收上行集群数据后, 将收到的上行集群数据分别转发 给所建的各实例, 再由各实例分别发送给对应的被叫终端。
所述选择出的通信方式为组播通信方式;
所述集群基站, 还用于为集群终端建立集群实例;
所述核心网, 用于接收上行集群数据, 将收到的上行集群数据转发给 建立的集群实例, 再由集群实例将数据发送给集群终端。
从上述本发明提供的技术方案可以看出, 当终端发起集群呼叫时, 基 站根据通信方式选择策略, 选择单播或组播方式进行通信。 特别地, 当基 站负荷较轻(当前负荷结果低于预设阔值) 时, 选择釆用单播通信方式; 而当基站负荷较重 (当前负荷结果超过预设阔值) 时, 选择釆用组播通信 方式。 本发明将单播和组播两种通信方式良好的结合起来, 使得两者各自 的优势在集群系统中得到了充分体现。 通过本发明方法, 既在最大程度上 保障了通信质量, 又在系统高负荷的情况下节约了系统资源, 提高了系统 容量, 从而提高了服务质量, 保证了用户体验。 附图说明
图 1为本发明实现集群通信的方法的流程图;
图 2为本发明实现集群通信的系统的组成结构示意图;
图 3为本发明实现集群通信的方法的第一实施例的流程图;
图 4为本发明实现集群通信的方法的第二实施例的流程图。 具体实施方式
图 1为本发明实现集群通信的方法的流程图, 如图 1所示, 包括: 步骤 100: 基站预先设置通信方式选择策略。
本步骤中, 通信方式选择策略, 根据基站情况设置, 比如按照基站负 荷情况设置时, 通信方式选择策略为: 当基站负荷程度超过某一预设阔值 时, 通信方式为组播方式, 当负荷程度低于某一预设阔值时, 通信方式为 单播方式。
其中, 预设阔值可以是一个负荷值, 或负荷百分比值, 或网络侧能容 纳的用户数等等。
步骤 101 : 当终端发起集群呼叫时, 集群基站根据通信方式选择策略, 选择单播或组播方式进行通信。 这里, 集群组呼中的各集群终端所属的基 站也称为集群基站。 本步骤具体实现大致包括:
首先, 当终端发起集群呼叫时, 会与基站和核心网建立连接, 核心网 在收到初始 UE上下文消息时,发现当前呼叫为集群呼叫时,会触发集群寻 呼, 并向集群基站发起集群寻呼。 具体实现属于现有技术, 且其实现方法 不用于限定本发明保护范围。
接着, 集群基站收到集群寻呼后, 假设集群基站按照负荷情况设置的 通信方式选择策略, 那么, 集群基站查询负荷情况, 如果当前负荷结果低 于预设阔值时, 则集群呼叫中的终端在此次呼叫业务选择釆用单播通信方 式进行通信; 如果当前负荷结果超过预设阈值, 则集群呼叫中的终端在此 次呼叫业务选择釆用组播的通信方式进行通信; 集群基站收到集群寻呼后 立即建立集群实例, 并周期性在小区中发送集群寻呼, 寻呼消息中携带用 于表示是单播方式还是多播方式的通信方式标志。
最后, 所述基站根据选出的通信方式, 为集群呼叫中的终端的呼叫业务 分配资源后进行通信: 如果通信方式标志显示为组播方式, 则核心网收到 上行集群数据后, 将上行集群数据转发给所有集群基站的集群实例 (即集 群基站收到集群寻呼后立即建立的集群实例 ), 再由集群实例将数据发送给 集群终端(参与集群通信的各被叫终端); 如果通信方式编制显示为单播方 式, 收到集群寻呼的终端分别与基站和核心网建立连接, 基站分别为各自 的终端建立实例, 核心网收到上行集群数据后, 将上行集群数据转发给各 基站为其所辖的被叫终端所建的实例, 再由这些实例分别发送给其对应的 各被叫终端。
从本发明方法可见, 当基站负荷较轻(当前负荷结果低于预设阔值)时, 釆用单播通信方式; 而当基站负荷较重(当前负荷结果超过预设阔值)时, 釆用组播通信方式。 通过本发明方法, 既在最大程度上保障了通信质量, 又在系统高负荷的情况下节约了系统资源, 提高了系统容量, 从而提高了 服务质量, 保证了用户体验。 针对本发明方法, 还提供一种实现集群通信的系统, 如图 2所示, 至 少包括基站, 以及多个终端, 其中,
基站, 其中设置有通信方式选择策略; 用于接收到终端发起的集群呼 叫, 根据通信方式选择策略, 选择单播或组播方式进行通信。 这里, 集群 组中的各集群终端所属的基站也称为集群基站。
终端, 包括主叫终端和有至少一个终端组成的被叫终端组, 用于发起 集群呼叫, 主叫终端与被叫终端组之间按照基站选择出的单播或组播方式 进行通信。
下面结合实施例对本发明方法进行详细描述。 以下实施例中, 4叚设通 信方式选择策略为: 当负荷程度超过预设阔值时, 通信方式为组播方式通 信, 当基站负荷程度低于预设阔值时, 通信方式为单播方式通信。
图 3 为本发明实现集群通信的方法的第一实施例的流程图, 第一实施 例中, 假设终端 1发起集群呼叫, 终端 2为集群组内的一个被叫终端; 各 基站设定负荷阔值, 当基站负荷低于负荷阔值时, 称为负荷较轻, 当基站 负荷超过负荷阔值时, 称为负荷较重。 这里, 集群组中的各集群终端所属 的基站也称为集群基站。 如图 3所示, 包括以下步骤:
步骤 300:终端 1发起集群呼叫 ,终端 1向基站发送随机接入请求消息。 步骤 301 : 基站回复随机接入响应, 在随机接入响应中携带分配给终端 1的上行资源。
步骤 302: 终端 1在为其分配的上行资源上发送无线链路控制 (RRC ) 建立请求消息。
步骤 303: 基站向终端 1返回 RRC建立消息。
步骤 304: 终端 1收到 RRC建立消息后, 向基站发送 RRC建立完成消 息, 在 RRC建立完成该消息中携带有非接入层消息, 非接入层消息中包含 有集群编号信息。
步骤 305:基站收到 RRC建立完成消息, 向核心网发送初始终端(UE ) 上下文消息。
步骤 306: 核心网收到初始 UE上下文消息, 发现当前呼叫是一个集群 呼叫, 建立集群呼叫实例, 触发集群寻呼, 并向集群基站发射集群承载建 立请求消息, 同时向发起初始 UE上下文消息的基站发回 UE上下文建立请 求消息。
步骤 307: 基站收到 UE上下文建立请求消息, 向终端 1发送 RRC重 配消息。
步骤 308: 终端 1收到 RRC重配消息, 发送 RRC重配响应消息。
步骤 309: 基站收到 RRC重配响应消息 , 向核心网发送初始 UE上下 文建立请求响应消息。
步骤 310〜步骤 312: 集群基站收到集群寻呼, 查询自身负荷情况, 假 设此时负荷为较重, 则选择釆用多播方式通信; 同时, 周期性在小区中发 送集群寻呼, 并在集群寻呼消息中携带表示釆用多播方式的通信方式标志。
步骤 313〜步骤 314: 集群基站收到核心网的集群承载建立请求消息, 建立集群实例, 并向核心网发送集群承载建立响应消息。
步骤 315〜步骤 317: 核心网收到上行集群数据, 将上行集群数据转发 给集群基站建立的集群实例, 再由集群实例将数据发送给终端 2。 终端 1与 终端 2间釆用组播通信方式进行通信。
其中, 步骤 307〜步骤 309, 与步骤 310〜步骤 312, 以及步骤 313〜步骤 314的执行没有严格的先后顺序。
图 4为本发明实现集群通信的方法的第二实施例的流程图, 第二实施 例中, 假设终端 1发起集群呼叫, 终端 2为集群组内的一个被叫终端; 各 基站设定负荷阔值, 当基站负荷低于负荷阔值时, 称为负荷较轻, 当基站 负荷超过负荷阔值时, 称为负荷较重。 这里, 集群组中的各集群终端所属 的基站也称为集群基站。 如图 4所示, 包括以下步骤:
步骤 400: 终端发起集群呼叫, 终端 1向基站发送随机接入请求消息。 步骤 401: 基站回复随机接入响应, 在随机接入响应中携带有分配给终 端 1的上行资源。
步骤 402: 终端 1在分配的上行资源上发送 RRC建立请求消息。
步骤 403: 基站向终端 1返回 RRC建立消息。
步骤 404: 终端 1收到 RRC建立消息后, 向基站发送 RRC建立完成消 息, 在 RRC建立完成消息中携带有非接入层消息, 非接入层消息中包含有 集群编号信息。
步骤 405: 基站收到 RRC建立完成消息, 向核心网发送初始 UE上下 文消息。
步骤 406: 核心网收到初始 UE上下文消息, 发现当前呼叫是一个集群 呼叫, 建立集群呼叫实例, 触发集群寻呼, 向集群基站发射集群承载建立 请求消息, 同时, 向发起初始 UE上下文消息的基站发送初始 UE上下文建 立请求消息。
步骤 407:基站收到初始 UE上下文建立请求消息, 向终端 1发送 RRC 重配消息。
步骤 408:终端 1收到 RRC重配消息,向基站返回 RRC重配响应消息。 步骤 409: 基站收到 RRC重配响应消息 , 向核心网发送初始 UE上下 文建立请求响应消息。
步骤 410〜步骤 412: 集群基站收到集群寻呼, 查询自身负荷情况, 假 设此时负荷为较轻, 选择釆用单播方式通信, 同时周期性在小区中发送集 群寻呼, 寻呼消息中携带表示釆用单播方式的通信方式标志。
步骤 413〜步骤 414: 集群基站收到核心网的集群承载建立请求消息, 建立集群实例, 并向核心网返回集群承载建立响应消息。
步骤 415〜步骤 425: 终端 2收到携带有表示釆用单播方式的通信方式 标志的寻呼后, 向基站发送随机接入请求消息; 接着,
基站回复随机接入响应, 在随机接入响应中携带有分配给终端 2 的上 行资源, 终端 2在分配的上行资源上发送 RRC建立请求消息; 基站向终端 2返回 RRC建立消息; 终端 2收到 RRC建立消息后 , 向基站发送 RRC建 立完成消息, 基站收到 RRC建立完成消息, 向核心网发送初始 UE上下文 消息; 核心网收到初始 UE上下文消息后, 向基站发送初始 UE上下文建立 请求消息, 为终端 2建立实例; 基站收到初始 UE上下文建立请求消息后, 向终端 2发送 RRC重配消息; 终端 2收到 RRC重配消息, 返回 RRC重配 响应消息; 基站收到 RRC重配响应消息, 向核心网返回 UE上下文建立请 求响应消息。
步骤 426〜步骤 428: 核心网收到上行集群数据, 将上行集群数据转发 给终端 2所属基站为终端 2所建的实例, 再由该实例发送给被叫终端 2。
其中, 步骤 407〜步骤 409、 与步骤 410〜步骤 412、 以及步骤 413〜步骤 414的执行没有严格的先后顺序。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围, 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等, 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种实现集群通信的方法, 其特征在于, 包括:
基站预先设置通信方式选择策略;
当终端发起集群呼叫时, 集群基站根据通信方式选择策略, 选择单播 或组播方式进行通信。
2、 根据权利要求 1所述的方法, 其特征在于, 所述通信方式选择策略 根据基站情况设置。
3、 根据权利要求 2所述的方法, 其特征在于, 所述通信方式选择策略 为: 当基站负荷超过预设阔值时, 通信方式为组播方式, 当基站负荷低于 预设阔值时, 通信方式为单播方式。
4、 根据权利要求 3所述的方法, 其特征在于, 所述根据通信方式选择 策略, 选择单播或组播方式进行通信包括:
所述基站查询负荷情况, 如果当前负荷结果低于预设阔值时, 则所述 集群呼叫中的终端在此次呼叫业务选择釆用单播通信方式进行通信; 如果 当前负荷结果超过预设阔值, 则所述集群呼叫中的终端在此次呼叫业务选 择釆用组播的通信方式进行通信;
所述集群基站周期性在小区中发送集群寻呼, 寻呼消息中携带用于表 示是单播方式还是多播方式的通信方式标志;
所述基站根据选出的通信方式, 为集群呼叫中的终端的呼叫业务分配 资源后进行通信。
5、 根据权利要求 4所述的方法, 其特征在于, 所述选择出的通信方式 为单播通信方式; 所述根据选出的通信方式, 为终端的呼叫业务分配资源 包括:
所述收到集群寻呼的终端分别与基站和核心网建立连接, 基站分别为 各自的终端建立实例; 核心网将收到的上行集群数据分别转发给所建的各 实例, 再由各实例分别发送给对应的被叫终端。
6、 根据权利要求 4所述的方法, 其特征在于, 所述选择出的通信方式 为组播通信方式; 所述根据选出的通信方式, 为终端的呼叫业务分配资源 包括:
集群基站为集群终端建立集群实例, 核心网将收到的上行集群数据发 给建立的集群实例, 再由集群实例将数据发送给集群终端。
7、 根据权利要求 3~6任一项所述的方法, 其特征在于, 所述预设阔值 为负荷值, 或负荷百分比值, 或网络侧能容纳的用户数。
8、 一种实现集群通信的系统, 其特征在于, 至少包括基站, 以及参与 集群通信的多个终端, 其中,
基站, 其中设置有通信方式选择策略; 用于接收到终端侧发起集群呼 叫, 根据通信方式选择策略, 选择单播或组播方式进行通信;
终端, 包括主叫终端和有至少一个终端组成的被叫终端组, 用于发起 集群呼叫, 主叫终端与被叫终端组之间按照基站选择出的单播或组播方式 进行通信。
9、 根据权利要求 8所述的系统, 其特征在于, 所述通信方式选择策略 为: 当基站负荷超过预设阔值时, 通信方式为组播方式通信, 当基站负荷 低于预设阔值时, 通信方式为单播方式通信。
10、 根据权利要求 8或 9所述的系统, 其特征在于, 所述基站, 具体 用于:
所述基站接收到终端侧发起集群呼叫, 查询负荷情况, 在当前负荷结 果低于预设阔值时, 则确定为所述集群呼叫中的终端在此次呼叫业务选择 釆用单播通信方式进行通信; 在当前负荷结果超过预设阈值, 确定为所述 集群呼叫中的终端在此次呼叫业务选择釆用组播的通信方式进行通信; 所述集群基站周期性在小区中发送集群寻呼, 寻呼消息中携带用于表 示是单播方式还是多播方式的通信方式标志; 所述基站根据选出的通信方式, 为集群呼叫中的终端的呼叫业务分配 资源后进行通信。
11、 根据权利要求 10所述的系统, 其特征在于, 所述系统还包括核心 网;
所述选择出的通信方式为单播通信方式;
所述收到集群寻呼的终端, 具体用于分别与其所属基站和核心网建立 连接,
所述基站, 还用于分别为各自的终端建立实例;
核心网, 用于接收上行集群数据后, 将收到的上行集群数据分别转发 给所建的各实例, 再由各实例分别发送给对应的被叫终端。
12、 根据权利要求 10所述的系统, 其特征在于, 所述选择出的通信方 式为组播通信方式;
所述集群基站, 还用于为集群终端建立集群实例;
所述核心网, 用于接收上行集群数据, 将收到的上行集群数据转发给 建立的集群实例, 再由集群实例将数据发送给集群终端。
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