WO2007014528A1 - A method for realizing single call in group system - Google Patents

A method for realizing single call in group system Download PDF

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Publication number
WO2007014528A1
WO2007014528A1 PCT/CN2006/001934 CN2006001934W WO2007014528A1 WO 2007014528 A1 WO2007014528 A1 WO 2007014528A1 CN 2006001934 W CN2006001934 W CN 2006001934W WO 2007014528 A1 WO2007014528 A1 WO 2007014528A1
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WIPO (PCT)
Prior art keywords
base station
terminal
call
message
scheduling server
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PCT/CN2006/001934
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English (en)
French (fr)
Inventor
Wenling Lu
Jinlong Liu
Qiang Wu
Weihao Li
Bo Sun
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ZTE Corp
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ZTE Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10Push-to-Talk [PTT] or Push-On-Call services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/40Connection management for selective distribution or broadcast
    • H04W76/45Connection management for selective distribution or broadcast for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services

Definitions

  • N2006/001934 A method for implementing single call in a cluster system
  • the present invention relates to a method for implementing a single call in a cluster system, and more particularly to a method for implementing a single call in a CDMA (Code Division Multiple Access) digital trunking system.
  • CDMA Code Division Multiple Access
  • the cellular trunking communication system combines the cellular communication system with the dedicated dispatching communication system, which not only expands the service range of the cellular communication system, but also frees the trunking communication system from the functional and regional limitations of the dedicated dispatching communication system.
  • Cluster communication is a half-duplex communication method that uses PTT (Push to Talk) to communicate.
  • PTT Push to Talk
  • An important business function of the cluster system is the PTT single call, which is a kind of point-to-point call mode.
  • Traditional cluster communication uses time-division multiple access, which has the disadvantages of low frequency resource utilization and smooth transition to third-generation communication. CDMA technology can solve these problems.
  • Invention disclosure
  • the technical problem to be solved by the present invention is to provide a method for implementing a single call in a cluster system, which is used to solve the defect that the frequency resource utilization of the traditional cluster communication mode is low and the transition to the third generation communication cannot be smooth.
  • the present invention provides a method for implementing a single call in a cluster system, which is applicable to a code division multiple access cluster system including a terminal, a base station, a switch, and a cluster scheduling server, and includes: Receiving a call origination message sent by the terminal and performing a PTT single call origination step; receiving, by the base station, a paging message sent by the cluster scheduling server, and performing a PTT single call paging step;
  • the method for implementing a single call in the cluster system, where the PTT single call initiation step specifically includes:
  • Step 11 The base station receives a call origination message sent by the terminal, returns an acknowledgement message, and establishes a call connection with the cluster scheduling server.
  • Step 12 The switch receives a service request message sent by the base station and returns an assignment request message.
  • Step 13 After receiving the assignment request message, the base station sends an extended channel assignment message to the terminal, and the terminal is notified to notify the switch that the assignment is completed, and the cluster scheduling server is notified to complete the call setup.
  • Step 14 The terminal receives an authorization message sent by the cluster scheduling server and returns an authorization response message by using the base station.
  • the method for implementing a single call in the cluster system, where the PTT single call paging step specifically includes:
  • Step 21 After receiving the call request of the calling user, the cluster scheduling server searches the base station for the called user.
  • Step 22 The base station receives a paging response of the paged user and sends a service request message to the switch, and after receiving the message, the switch sends an assignment request message to the base station.
  • Step 23 The base station receives the assignment request message, and sends an extended channel assignment message to the terminal, and the terminal is notified to notify the switch that the assignment is completed, and the cluster scheduling server is notified to complete the call establishment;
  • Step 24 After receiving the authorization response message of the calling user, the cluster scheduling server sends a call alert tone to the terminal to start a call.
  • step 11 further includes a step of determining, by the cluster scheduling server, the terminal to determine whether the terminal has a PTT service right.
  • the method for implementing a single call in the cluster system wherein the step of the base station capturing the terminal further includes the step of performing signaling handshake and/or service negotiation between the base station and the terminal.
  • the method for implementing a single call in the cluster system wherein the assignment request message carries a user service quality and/or a privacy parameter.
  • the method for implementing a single call in the cluster system where the extended channel assignment message carries a radio resource allocated by the base station, where the radio resource includes a basic channel configuration, a multiplexing mode, a rate set, and a frequency point. Frequency band, frame offset, RC, PN, walshcode, one or more of the user IMSI.
  • the method for implementing a single call in the cluster system where the step of processing the PTT request message specifically includes:
  • Step 31 The terminal presses a PTT key in an active state, and sends a PTT request message to the cluster scheduling server by using the base station;
  • Step 32 The cluster scheduling server receives and processes the PTT request message, and sends an authorization message to the terminal by using the base station.
  • Step 33 The terminal receives the authorization message and performs type determination, and performs corresponding processing according to the type.
  • Step 34 The cluster scheduling server performs corresponding processing according to whether an authorization response message of the terminal is received.
  • the method for implementing a single call in the cluster system wherein, in the step 33, when the authorization message is an authorized speech, the terminal dispatches a server to the cluster through the base station when a voice prompt is sounded. Sending an authorization response message; when the authorization message is a rejection ⁇ request, the terminal returns to the initial activation state. ⁇ ⁇
  • step 34 when the cluster scheduling server receives the authorization response message of the terminal, the PTT request of other users is no longer accepted; If the scheduling server does not receive the authorization response message of the terminal, the PTT request of other users is re-accepted.
  • the method for implementing a single call in the cluster system specifically includes:
  • Step 41 The terminal releases the pressed PTT key and sends a PTT release message to the cluster scheduling server by using the base station;
  • Step 42 The cluster scheduling server receives the release message and sends a release response message to the terminal by using the base station, and the current PTT session ends.
  • the method for implementing a single call in the cluster system specifically includes:
  • Step 51 The base station receives a call release request message sent by the terminal, and returns a release. Responding to the message, releasing the allocated resources at the same time, and sending a call release request message to the cluster scheduling server and the switch;
  • Step 52 The cluster scheduling server, the switch receives the call release request message, and respectively send a release command to the base station;
  • Step 53 After the base station receives the release command of the cluster scheduling server and the switch, notify the cluster scheduling server that the switch is released.
  • the method for implementing a single call in the cluster system specifically includes:
  • Step 61 The base station receives a call release command sent by the cluster scheduling server, and sends a call release request message to the switch.
  • Step 62 The base station sends a call release request message to the terminal and releases the allocated resources
  • Step 63 After the base station receives the release response message of the terminal and the release command of the switch, the base station notifies the cluster scheduling server that the switch is released.
  • FIG. 1 is a schematic flowchart of a PTT single call method according to the present invention.
  • FIG. 2 is a schematic diagram of a PTT single call originating process according to the present invention.
  • FIG. 3 is a schematic diagram of a PTT single-call paging process according to the present invention. The best way to implement the invention
  • the cluster communication system based on the CDMA system is taken as an example, and the implementation of the technical solution is further described in detail with reference to the accompanying drawings.
  • FIG. 1 is a schematic flowchart of the FTT single call method according to the present invention.
  • the PTT single-call method is applicable to a CDMA trunking system, which is composed of a mobile station (MS), a base station subsystem (BSS), a PTT scheduling subsystem (PTT Dispatching Server, PDS), and an exchange.
  • the subsystem consists of a Mobile Switch Subsystem (MSS).
  • MSS Mobile Switch Subsystem
  • Mobile Station MS is a mobile device used directly by users in the system, and is divided into mobile terminals (mobile phones) and mobile stations.
  • the base station subsystem BSS is all ground infrastructure of the communication part of the wireless mobile network, the main package
  • the base station (BS) and the base station controller (BSC) are connected to the mobile station MS through a radio interface, and are connected to the mobile switching center (MSC) through the base station controller BSC.
  • the system BSS completes the wireless transmission, reception and management functions, and also accepts the network management system control.
  • the MSS includes a Mobile Switching Center MSC and a Storage User Data and Mobility Management Information Base. Switching Subsystem The MSS also manages the communication of user terminals in the mobile network with other communications networks.
  • the PTT single call method of the present invention specifically includes the following steps:
  • Step 101 the calling process of the PTT single call
  • Step 102 a paging process of the PTT single call
  • Step 103 a PTT request process
  • Step 104 a PTT release process
  • Step 105 A call release process initiated by the mobile terminal or the PDS.
  • step 103 may further comprise the following steps:
  • Step A1 The mobile terminal in the active state presses the PTT button, and the mobile terminal sends a PTT request message to the PDS through the base station;
  • Step A2 After receiving the PTT request message, the PDS performs arbitration, and sends an authorization message to the mobile terminal by using the base station; where the authorization message may be an authorized speech or a PTT request.
  • Step A3 determining the type of the authorization message received by the mobile terminal. If the received authorization message is an authorized voice, the mobile terminal sends an authorization response message to the PDS through the base station while sending the voice prompt tone; if the received authorization message is Rejecting the PTT request, the mobile terminal returns to the initial activation state; and
  • Step A4 After receiving the authorization response message of the mobile terminal, the PDS does not accept the PTT request of other users; if the PDS does not receive the message, it re-accepts the PTT request of other users.
  • step 104 may further comprise the following steps:
  • Step B1 when the mobile terminal pressing the PTT button releases the PTT button, the mobile terminal passes through the base station.
  • PDS sends a PTT release message
  • Step B2 After receiving the PTT release message, the PDS sends a release response to the mobile terminal through the base station, indicating that the PTT session ends.
  • the call release process initiated by the mobile terminal may further include the following steps: Step C1, the mobile terminal initiates a call release request message to the base station, and the base station sends the call release message to the mobile terminal. Release the response, release the allocated resources at the same time, and send a call release request message to both the PDS and the MSC;
  • Step C2 After receiving the call release request message, the PDS sends a release command to the base station; after receiving the call release request message, the MSC sends a release command to the base station;
  • Step C3 After the base station collects the release command message of the PDS and the MSC, the base station notifies the release of the PDS, and notifies the release of the MSC.
  • the call release process initiated by the PDS may further include the following steps: Step D1: The PDS initiates a call release command to the base station, and after receiving the release command, the base station sends a call release request message to the MSC;
  • Step D2 The base station initiates a call release request message to the mobile terminal, and the base station releases the allocated resources;
  • Step D3 After the base station receives the release response message of the mobile terminal and the release command message of the MSC, the base station notifies the release of the PDS, and notifies the release of the MSC.
  • FIG. 2 it is a schematic diagram of a PTT single-call originating process according to the present invention.
  • the process specifically includes the following steps:
  • Step 201 the mobile terminal 10 sends a call message to the base station 20;
  • Step 202 The base station 20 sends an acknowledgement message to the mobile terminal 10 after receiving the call origination message.
  • Step 203 The base station 20 sends a call request to the PDS 30 to establish a call connection between the base station 20 and the PDS 30.
  • the step of authenticating the user by the PDS 30 is further included, and the authentication content includes whether the PDS 30 has the PTT service authority or the like;
  • Step 204 The PDS 30 sends a call connection request message to the base station 20, where the call connection request message carries the call type as a single call, whether the call attribute is an emergency call or a preemption preference, a call priority, a preemption preference indication, and the like;
  • Step 205 The base station 20 sends a service request message to the switch 40.
  • Step 206 After receiving the service request message, the switch 40 sends an assignment request to the base station 20, where the assignment request can carry information such as user service quality and security parameters.
  • Step 207 After receiving the assignment request sent by the switch 40, the base station 20 sends an extended channel assignment message to the mobile terminal 10, where the assignment message needs to carry the radio resource allocated by the base station 20: basic channel configuration, multiplexing mode, and rate Set, frequency, band, frame offset, RC (Radio Configuration, Wireless configuration), PN (Pilot Number), walshcode, and IMSI (International Mobile Subscriber Identity).
  • the base station 20 transmits a Null service frame to the mobile terminal 10, attempting to capture the mobile terminal 10. After the base station 20 captures the Preamble preamble of the reverse basic channel of the mobile terminal 10, it indicates that the mobile terminal 10 enters the traffic channel and is captured by the base station 20;
  • Step 208 The base station 20 starts to capture the mobile terminal 10. After the traffic channel is successfully captured, the base station 20 sends an assignment completion message to notify the switch 40 that the assignment is completed.
  • the base station 20 and the mobile terminal 10 can also add content such as signaling handshake and service negotiation.
  • Step 209 The base station 20 sends a call setup complete message to the PDS 30.
  • Step 210 After receiving the call setup complete message sent by the called user, the PDS 30 sends an authorization message to the base station 20;
  • Step 211 the base station 20 sends authorization information to the mobile terminal 10;
  • Step 212 After receiving the authorization message, the mobile terminal 10 sends an authorization response message to the base station 20; Step 213: The base station 20 sends a PTT authorization response/response message to the PDS 30.
  • FIG. 3 it is a schematic diagram of a PTT single-call paging process according to the present invention. The process specifically includes the following steps:
  • Step 301 After receiving the call request of the calling user, the PDS 30 pages the called user to the base station 20, and sends a paging message call connection request.
  • Step 302 After receiving the paging message of the PDS 30, the base station 20 sends a paging cancellation step 303 to the mobile terminal 10, and the mobile terminal 10 sends a paging response to the base station 20.
  • Step 304 The base station 20 sends a service request message to the switch 40.
  • Step 305 After receiving the service request message, the switch 40 sends an assignment request message to the base station 20, where the assignment request message can carry information such as user service quality and/or security parameters.
  • Step 306 After receiving the assignment request sent by the switch 40, the base station 20 sends an extended channel assignment message to the mobile terminal 10, where the assignment message needs to carry the radio resource allocated by the base station 20: basic channel configuration, multiplexing mode, and rate Set, frequency, band, frame offset, RC, PN, walshcode, user IMSI, etc.
  • the base station 20 transmits a Null service frame to the mobile terminal 10, attempting to capture the mobile terminal 10. After the base station 20 captures the Preamble of the reverse basic channel of the mobile terminal 10, it indicates the end of the mobile terminal. Terminal 10 enters the traffic channel and is captured by base station 20;
  • Step 307 the base station 20 starts to capture the mobile terminal 10. After the traffic channel is successfully captured, the base station 20 sends an assignment completion message to the switch 40 to notify the switch 40 that the assignment is completed;
  • Step 308 The base station 20 sends a call setup complete message to the PDS 30 to notify the PDS 30 that the call setup is completed. After receiving the authorization response message from the calling user, the PDS 30 sends a call alert tone to the mobile terminal 10, and the call starts.
  • the method for realizing PTT single call on the CDMA technology proposed by the invention improves the frequency resource utilization rate and realizes a smooth transition to the third generation communication.

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Description

N2006/001934 一种集群系统中实现单呼的方法 技术领域
本发明涉及一种集群系统中单呼的实现方法, 特别是涉及在 CDMA(Code Division Multiple Access, 码分多址)数字集群系统中实现单呼的方法。 背景技术
蜂窝集群通信系统将蜂窝通信系统与专用调度通信系统结合起来,既拓展 了蜂窝通信系统的业务范围,又使集群通信系统摆脱了专用调度通讯系统在功 能和区域方面的局限性。
集群通讯是一种半双工的通讯方式, 采用即按即说 PTT(Push to Talk)的方 式进行通讯。 集群系统的一个重要业务功能是 PTT单呼, 这是- -种点对点的 通话方式。传统的集群通讯都是采用时分多址的方式,存在着频率资源利用率 低, 无法向第三代通讯平滑过渡等缺陷, 而 CDMA技术可以解决这些问题。 发明公开
本发明所要解决的技术问题在于提供一种集群系统中实现单呼的方法,用 于解决传统集群通讯方式所存在的频率资源利用率低及无法向第三代通讯平 滑过渡的缺陷。
为了实现上述目的,本发明提供了一种集群系统中实现单呼的方法,适用 于包括终端、基站、交换机及集群调度服务器的码分多址集群系统,其特征在 于, 包括- 由所述基站接收所述终端发送的起呼消息并进行 PTT单呼起呼步骤; 由所述基站接收所述集群调度服务器发送的寻呼消息并进行 PTT单呼寻 呼步骤;
通过所述基站进行所述集群调度服务器与所述终端之间的 PTT请求消息 处理步骤;
通过所述基站进行所述集群调度服务器与所述终端之间的 PTT释放消息 处理步骤; 及
由所述基站接收、处理所述终端发送的呼叫释放消息步骤或由所述基站接 收、 处理所述集群调度服务器发送的呼叫释放消息步骤。
所述的集群系统中实现单呼的方法, 其中, 所述 PTT单呼起呼步骤具体 又包括:
步骤 11, 所述基站接收所述终端发送的起呼消息并返回一确认消息, 并 与所述集群调度服务器建立呼叫连接;
步骤 12, 所述交换机接收所述基站发送的业务请求消息并返回一指配请 求消息;
步骤 13, 所述基站收到所述指配请求消息后向所述终端发送扩展信道指 配消息, 捕获所述终端并通知所述交换机指配完成, 同时通知所述集群调度服 务器呼叫建立完成; 及
歩骤 14, 所述终端接收所述集群调度服务器发送的授权消息并通过所述 基站返回一授权响应消息。
所述的集群系统中实现单呼的方法, 其中, 所述 PTT单呼寻呼步骤具体 又包括:
步骤 21, 所述集群调度服务器收到主叫用户的呼叫请求后向所述基站寻 呼被叫用户;
步骤 22, 所述基站接收被寻呼用户的寻呼响应并向所述交换机发送业务 请求消息, 所述交换机收到该消息后发送指配请求消息给所述基站;
步骤 23, 所述基站接收所述指配请求消息并向所述终端发送扩展信道指 配消息,捕获所述终端并通知所述交换机指配完成, 同时通知所述集群调度服 务器呼叫建立完成; 及
步骤 24, 所述集群调度服务器收到主叫用户的授权响应消息后向所述终 端发出通话提示音开始通话。
所述的集群系统中实现单呼的方法, 其中, 所述步骤 11中, 还包括一由 所述集群调度服务器对所述终端进行鉴权判断所述终端是否具有 PTT业务权 限的步骤。
所述的集群系统中实现单呼的方法,其中,所述基站捕获所述终端的步骤 中, 还包括在所述基站与终端之间进行信令握手和 /或业务协商的步骤。
所述的集群系统中实现单呼的方法,其中,所述指配请求消息携带有用户 服务质量和 /或保密参数。 所述的集群系统中实现单呼的方法,其中,所述扩展信道指配消息携带所 述基站分配的无线资源,所述无线资源包括基本信道的配置、复用方式和速率 集、 频点、 频段、 帧偏置、 RC、 PN、 walshcode, 用户 IMSI中的一个或多个。
所述的集群系统中实现单呼的方法, 其中, 所述 PTT请求消息处理步骤 具体又包括:
歩骤 31、 所述终端在激活状态按下 PTT键并通过所述基站向所述集群调 度服务器发送 PTT请求消息;
步骤 32、 所述集群调度服务器接收处理所述 PTT请求消息并通过所述基 站向所述终端发送授权消息;
步骤 33、 所述终端接收所述授权消息并进行类型判断, 并根据类型作出 相应处理; 及
步骤 34、 所述集群调度服务器根据是否收到所述终端的授权应答消息作 出相应处理。
所述的集群系统中实现单呼的方法, 其中, 所述步骤 33中, 当所述授权 消息为授权说话时,则所述终端在发出说话提示音时通过所述基站向所述集群 调度服务器发送授权应答消息; 当所述授权消息为拒绝 ρττ请求时, 则所述 终端返回至初始激活状态。 · ·
所述的集群系统中实现单呼的方法, 其中, 所述步骤 34中, 当所述集群 调度服务器收到所述终端的授权应答消息, 则不再受理其它用户的 PTT请求; 当所述集群调度服务器未收到所述终端的授权应答消息,则重新受理其它用户 的 PTT请求。
所述的集群系统中实现单呼的方法, 其中, 所述 FTT释放消息处理步骤 具体又包括:
步骤 41、 所述终端松开按下的 PTT键并通过所述基站向所述集群调度服 务器发送 PTT释放消息; 及
步骤 42、 所述集群调度服务器接收所述释放消息并通过所述基站向所述 终端发送释放应答消息, 本次 PTT会话结束。
所述的集群系统中实现单呼的方法,其中,所述终端发送的呼叫释放消息 步骤具体又包括:
步骤 51、 所述基站接收所述终端发送的呼叫释放请求消息并返回一释放 响应消息, 同时释放已分配资源,并向所述集群调度服务器和所述交换机发送 呼叫释放请求消息;
步骤 52、 所述集群调度服务器、 所述交换机接收所述呼叫释放请求消息 并分别向所述基站发送释放命令; 及
步骤 53、所述基站收齐所述集群调度服务器和所述交换机的释放命令后, 通知所述集群调度服务器、 所述交换机释放完毕。
所述的集群系统中实现单呼的方法,其中,所述集群调度服务器发送的呼 叫释放消息歩骤具体又包括:
步骤 61、 所述基站接收所述集群调度服务器发送的呼叫释放命令并向所 述交换机发送呼叫释放请求消息;
步骤 62、所述基站向所述终端发送呼叫释放请求消息并释放已分配资源; 及
步骤 63、 所述基站收齐所述终端的释放响应消息和所述交换机的释放命 令后, 通知所述集群调度服务器、 所述交换机释放完毕。 附图简要说明
图 1为本发明 PTT单呼方法流程示意图;
图 2为本发明 PTT单呼起呼流程示意图;
图 3为本发明 PTT单呼寻呼流程示意图。 实现本发明的最佳方式
下面以基于 CDMA制式的集群通讯系统为例, 结合附图对技术方案的实 施作进一步的详细描述。
请参阅图 1所示, 为本发明 FTT单呼方法流程示意图。 该 PTT单呼方法 适用于 CDMA集群系统, 该系统由移动台 (Mobile Station, MS)、 基站子系统 (Base Station Subsystem, BSS)、 PTT调度子系统 /调度服务器 (PTT Dispatching Server, PDS)、 交换子系统 (Mobile Switch Subsystem, MSS)组成。
移动台 MS是系统中直接由用户使用的移动设备, 并分为移动终端 (手机) 和车载台两种。
基站子系统 BSS是无线移动网的通信部分的所有地面基础设施, 主要包 括基站 (Base Station, BS)和基站控制器 (Base Station Controller, BSC), 其通过 无线接口与移动台 MS 连接, 通过基站控制器 BSC 与移动交换中心 (Mobile Switching Center, MSC)连接, 基站子系统 BSS完成无线发送、 接收和管理功 能, 还接受网管系统控制。
交换子系统 MSS包括移动交换中心 MSC和存储用户数据和移动管理信 息库。 交换子系统 MSS还管理移动网中用户终端与其他通信网的通信。
本发明 PTT单呼方法具体包括如下步骤:
步骤 101, PTT单呼的起呼过程;
步骤 102, PTT单呼的寻呼过程;
步骤 103, PTT请求过程;
步骤 104, PTT释放过程; 及
步骤 105, 移动终端或 PDS发起的呼叫释放过程。
上述步骤 103又可以包括下列步骤:
步骤 A1,处于激活状态的移动终端按下 PTT键,移动终端通过基站向 PDS 发送 PTT请求消息;
步骤 A2, PDS收到 PTT请求消息后进行仲裁, 通过基站向移动终端发送 授权消息; 其中, 授权消息可以是授权说话, 也可以是拒绝 PTT请求;
步骤 A3, 判断移动终端收到的授权消息类型, 如果收到的授权消息是授 权说话, 则移动终端在发出说话提示音的同时, 通过基站向 PDS发送授权应 答消息; 如果收到的授权消息是拒绝 PTT请求, 则移动终端回到初始的激活 状态; 及
步骤 A4, PDS收到移动终端的授权应答消息后,不再受理其它用户的 PTT 请求; 如果 PDS没有收到该消息, 则重新受理其它用户的 PTT请求。
上述步骤 104又可以包括下列步骤:
步骤 B1, 按下 PTT键的移动终端如果松开 PTT键,移动终端通过基站向
PDS发送 PTT释放消息; 及
步骤 B2, PDS收到 PTT释放消息后,通过基站向移动终端发送释放应答, 表示本次 PTT会话结束。
上述步骤 105中, 由移动终端发起的呼叫释放过程又可以包括下列步骤: 步骤 Cl, 移动终端向基站发起呼叫释放请求消息, 基站向移动终端发送 释放响应, 同时释放已分配的资源, 并向 PDS和 MSC都发送呼叫释放请求消 息;
步骤 C2, PDS收到呼叫释放请求消息后, 向基站发送释放命令; MSC收 到呼叫释放请求消息后, 向基站发送释放命令; 及
步骤 C3,基站收齐 PDS和 MSC的释放命令消息后,通知 PDS释放完毕, 通知 MSC释放完毕。
上述步骤 105中, 由 PDS发起的呼叫释放过程又可以包括下列步骤: 步骤 Dl, PDS 向基站发起呼叫释放命令, 基站收到释放命令后向 MSC 发送呼叫释放请求消息;
步骤 D2, 基站向移动终端发起呼叫释放请求消息, 同时基站释放已分配 的资源; 及
步骤 D3, 基站收齐移动终端的释放响应消息和 MSC的释放命令消息后, 通知 PDS释放完毕, 通知 MSC释放完毕。
请参阅图 2所示, 为本发明 PTT单呼起呼流程示意图, 该流程具体包括 如下歩骤:
步骤 201, 移动终端 10发送起呼消息给基站 20;
步骤 202, 基站 20收到起呼消息后向移动终端 10发送确认消息; 步骤 203, 基站 20向 PDS 30发送呼叫请求, 建立基站 20与 PDS 30之间 的呼叫连接;
该步骤中, 还包括 PDS 30对用户进行鉴权的步骤, 鉴权内容包括 PDS 30 是否有 PTT业务的权限等;
步骤 204, PDS 30向基站 20发送呼叫连接请求消息, 该呼叫连接请求消 息可携带呼叫类型为单呼, 呼叫属性为紧急呼叫还是预占优选, 呼叫优先级, 预占优选指示等;
步骤 205, 基站 20向交换机 40发送业务请求消息;
步骤 206, 交换机 40收到业务请求消息后, 发送指配请求给基站 20, 指 配请求可携带用户服务质量、 保密参数等信息;
步骤 207, 基站 20收到交换机 40发送的指配请求后, 向移动终端 10发 送扩展信道指配消息, 该指配消息需携带基站 20分配的无线资源: 基本信道 的配置、 复用方式和速率集、 频点、 频段、 帧偏置、 RC(Radio Configuration, 无线配置)、 PN(Pilot Number , 导频)、 walshcode (沃尔什码), 用户 IMSI(International Mobile Subscriber Identity, 国际移动用户识别码)等信息。基 站 20向移动终端 10发送 Null业务帧, 尝试捕获移动终端 10。基站 20捕获到 移动终端 10的反向基本信道的 Preamble前导码)后, 表明移动终端 10进入业 务信道并被基站 20捕获;
步骤 208, 基站 20开始捕获移动终端 10, 业务信道捕获成功后, 基站 20 发送指配完成消息通知交换机 40指配完成;
该步骤中,基站 20同移动终端 10之间还可增加信令握手、业务协商等内 容;
步骤 209, 基站 20向 PDS 30发送呼叫建立完成消息;
步骤 210, PDS 30在收到被呼用户发送的呼叫建立完成消息之后, 向基站 20发送授权消息;
步骤 211, 基站 20发送授权信息给移动终端 10;
步骤 212, 移动终端 10收到授权消息后, 向基站 20发送授权应答消息; 步骤 213, 基站 20向 PDS 30发送 PTT授权应答 /响应.消息。
请参阅图 3所示, 为本发明 PTT单呼寻呼流程示意图, 该流程具体包括 如下步骤:
步骤 301, PDS 30收到主叫用户的呼叫请求后, 向基站 20寻呼被叫用户, 发送寻呼消息呼叫连接请求;
步骤 302, 基站 20收到 PDS 30的寻呼消息后向移动终端 10发送寻呼消 步骤 303, 移动终端 10向基站 20发寻呼响应;
步骤 304, 基站 20向交换机 40发送业务请求消息;
步骤 305,交换机 40收到业务请求消息后,向基站 20发送指配请求消息, 该指配请求消息可携带用户服务质量和 /或保密参数等信息;
步骤 306, 基站 20收到交换机 40发送的指配请求后, 向移动终端 10发 送扩展信道指配消息, 该指配消息需携带基站 20分配的无线资源: 基本信道 的配置、 复用方式和速率集、 频点、 频段、 帧偏置、 RC、 PN、 walshcode, 用 户 IMSI等信息。基站 20向移动终端 10发送 Null业务帧, 尝试捕获移动终端 10。 基站 20捕获到移动终端 10的反向基本信道的 Preamble后, 表明移动终 端 10进入业务信道并被基站 20捕获;
步骤 307, 基站 20开始捕获移动终端 10, 业务信道捕获成功后, 基站 20 向交换机 40发送指配完成消息通知交换机 40指配完成; 及
该步骤中, 基站 20同移动终端 10之间还可以增加信令握手、 业务协商。 步骤 308, 基站 20向 PDS 30发送呼叫建立完成消息通知 PDS 30呼叫建 立完成, PDS 30收到主叫用户的授权响应消息后给移动终端 10发出通话提示 音, 通话开始。
当然,本发明还可有其它多种实施例,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,但 这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业应用性
本发明提出的在 CDMA技术上实现 PTT单呼的方法,提高了频率资源利 用率, 实现了向第三代通讯的平滑过渡。

Claims

权利要求书
1、 一种集群系统中实现单呼的方法, 适用于包括终端、 基站、 交换机及 集群调度服务器的码分多址集群系统, 其特征在于, 包括:
由所述基站接收所述终端发送的起呼消息并进行 PTT单呼起呼步骤; 由所述基站接收所述集群调度服务器发送的寻呼消息并进行 PTT单呼寻 呼步骤; '
通过所述基站进行所述集群调度服务器与所述终端之间的 PTT请求消息 处理步骤;
通过所述基站进行所述集群调度服务器与所述终端之间的 PTT释放消息 处理步骤; 及
由所述基站接收、处理所述终端发送的呼叫释放消息步骤或由所述基站接 收、 处理所述集群调度服务器发送的呼叫释放消息步骤。 .
2、 根据权利要求 1所述的集群系统中实现单呼的方法, 其特征在于, 所 述 PTT单呼起呼步骤具体又包括:
步骤 11, 所述基站接收所述终端发送的起呼消息并返回一确认消息, 并 与所述集群调度服务器建立呼叫连接;
步骤 12, 所述交换机接收所述基站发送的业务请求消息并返回一指配请 求消息;
步骤 13, 所述基站收到所述指配请求消息后向所述终端发送扩展信道指 配消息,捕获所述终端并通知所述交换机指配完成, 同时通知所述集群调度服 务器呼叫建立完成; 及
步骤 14, 所述终端接收所述集群调度服务器发送的授权消息并通过所述 基站返回一授权响应消息。
3、 根据权利要求 1所述的集群系统中实现单呼的方法, 其特征在于, 所 述 PTT单呼寻呼步骤具体又包括:
步骤 21, 所述集群调度服务器收到主叫用户的呼叫请求后向所述基站寻 呼被叫用户;
歩骤 22, 所述基站接收被寻呼用户的寻呼响应并向所述交换机发送业务 请求消息, 所述交换机收到该消息后发送指配请求消息给所述基站; 步骤 23, 所述基站接收所述指配请求消息并向所述终端发送扩展信道指 配消息,捕获所述终端并通知所述交换机指配完成, 同时通知所述集群调度服 务器呼叫建立完成; 及
歩骤 24, 所述集群调度服务器收到主叫用户的授权响应消息后向所述终 端发出通话提示音开始通话。
4、 根据权利要求 2所述的集群系统中实现单呼的方法, 其特征在于, 所 述步骤 11中, 还包括一由所述集群调度服务器对所述终端进行鉴权判断所述 终端是否具有 PTT业务权限的步骤。
5、根据权利要求 2、 3或 4所述的集群系统中实现单呼的方法, 其特征在 于,所述基站捕获所述终端的步骤中,还包括在所述基站与终端之间进行信令 握手和 /或业务协商的步骤。
6、根据权利要求 2、 3或 4所述的集群系统中实现单呼的方法, 其特征在 于, 所述指配请求消息携带有用户服务质量和 /或保密参数。
7、根据权利要求 2、 3或 4所述的集群系统中实现单呼的方法, 其特征在 于,所述扩展信道指配消息携带所述基站分配的无线资源,所述无线资源包括 基本信道的配置、复用方式和速率集、频点、频段、帧偏置、 RC、 PN、 walshcode, 用户 IMSI中的一个或多个。
8、 根据权利要求 1、 2、 3或 4所述的集群系统中实现单呼的方法, 其特 征在于, 所述 PTT请求消息处理步骤具体又包括:
步骤 31、 所述终端在激活状态按下 PTT键并通过所述基站向所述集群调 度服务器发送 PTT请求消息;
步骤 32、 所述集群调度服务器接收处理所述 PTT请求消息并通过所述基 站向所述终端发送授权消息; _
步骤 33、 所述终端接收所述授权消息并进行类型判断, 并根据类型作出 相应处理; 及
步骤 34、 所述集群调度服务器根据是否收到所述终端的授权应答消息作 出相应处理。
9、 根据权利要求 8所述的集群系统中实现单呼的方法, 其特征在于, 所 述步骤 33中, 当所述授权消息为授权说话时, 则所述终端在发出说话提示音 时通过所述基站向所述集群调度服务器发送授权应答消息;当所述授权消息为 拒绝 PTT请求时, 则所述终端返回至初始激活状态。
10、根据权利要求 9所述的集群系统中实现单呼的方法,其特征在于, 所 述步骤 34中, 当所述集群调度服务器收到所述终端的授权应答消息, 则不再 受理其它用户的 PTT请求; 当所述集群调度服务器未收到所述终端的授权应 答消息, 则重新受理其它用户的 PTT请求。
11、根据权利要求 1、 2、 3或 4所述的集群系统中实现单呼的方法, 其特 征在于, 所述 PTT释放消息处理步骤具体又包括:
步骤 41、 所述终端松开按下的 PTT键并通过所述基站向所述集群调度服 务器发送 PTT释放消息; 及
步骤 42、 所述集群调度服务器接收所述释放消息并通过所述基站向所述 终端发送释放应答消息, 本次 PTT会话结束。
12、根据权利要求 1、 2、 3或 4所述的集群系统中实现单呼的方法, 其特 征在于, 所述终端发送的呼叫释放消息步骤具体又包括:
' 步骤 51、 所述基站接收所述终端发送的呼叫释放请求消息并返回一释放 响应消息, 同时释放已分配资源,并向所述集群调度服务器和所述交换机发送 呼叫释放请求消息;
步骤 52、 所述集群调度服务器、 所述交换机接收所述呼叫释放请求消息 并分别向所述基站发送释放命令; 及
步骤 53、所述基站收齐所述集群调度服务器和所述交换机的释放命令后, 通知所述集群调度服务器、 所述交换机释放完毕。
13、根据权利要求 1、 2、 3或 4所述的集群系统中实现单呼的方法, 其特 征在于,'所述集群调度服务器发送的呼叫释放消息步骤具体又包括:
步骤 61、 所述基站接收所述集群调度服务器发送的呼叫释放命令并向所 述交换机发送呼叫释放请求消息;
步骤 62、所述基站向所述终端发送呼叫释放请求消息并释放已分配资源; 及
步骤 63、 所述基站收齐所述终端的释放响应消息和所述交换机的释放命 令后, 通知所述集群调度服务器、 所述交换机释放完毕。
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