WO2005122599A1 - Procede d'etablissement d'appel rapide pour systemes de communication numeriques a ressources partagees - Google Patents

Procede d'etablissement d'appel rapide pour systemes de communication numeriques a ressources partagees Download PDF

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Publication number
WO2005122599A1
WO2005122599A1 PCT/CN2004/001568 CN2004001568W WO2005122599A1 WO 2005122599 A1 WO2005122599 A1 WO 2005122599A1 CN 2004001568 W CN2004001568 W CN 2004001568W WO 2005122599 A1 WO2005122599 A1 WO 2005122599A1
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Prior art keywords
terminal
base station
call
channel
traffic channel
Prior art date
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PCT/CN2004/001568
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English (en)
French (fr)
Inventor
Yuhong Xue
Yingnan Liu
Jinlong Liu
Original Assignee
Zte Corporation
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Filing date
Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to EP04802580A priority Critical patent/EP1768423B1/en
Priority to US11/570,387 priority patent/US7702348B2/en
Publication of WO2005122599A1 publication Critical patent/WO2005122599A1/zh
Priority to NO20070064A priority patent/NO20070064L/no

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems

Definitions

  • the invention relates to a method for establishing a call in a mobile communication system, in particular to a method for quickly establishing a call in a trunked mobile communication system of a CDMA (Code Division Multiple Access) system.
  • CDMA Code Division Multiple Access
  • trunking communication has increasingly become an indispensable business content.
  • Digital trunking system is an important branch of mobile communication system. It is a special mobile communication system where multiple users share a group of wireless channels and use these channels dynamically.
  • the method for implementing trunking services in the CDMA2000 system includes group calling and private calling, which are important service features in the trunking system.
  • Group calling means that a single user can talk to everyone in the group at the same time when allowed.
  • the users in the group except the person who is speaking, must be listening, and once someone in the group presses the PTT (Push To Talk) button, if the priority of other people is the same as the person who is speaking, You can't steal, you can only wait for the speaker to finish the call.
  • a private call is a one-to-one user call. In a group, you can also select the person you want to call to talk without being heard by other people in the group.
  • CDMA-based trunking system pair For the trunk call service, a packet data channel is adopted, that is, the Ethernet transmission method is used to implement fast call establishment, instead of the traditional circuit domain adopting the circuit switching method.
  • the trunking system of the CDMA system adopts a fast call access method.
  • the CDMA trunking communication system is characterized by a half-duplex communication method, which can realize fast connection and support group calls, that is, one-to-many call methods.
  • users in a group are required to share the forward channel in the same cell. When a group user calls or speaks, as long as the user presses the PTT button, he can talk to other users in the group. This type of PTT service is widely used.
  • intercom system and trunking system provides command and dispatch function for group users.
  • group users For example, public security, fire protection, transportation, airport aviation, construction sites, large-scale assembly, military dispatch, etc.
  • CDMA trunking communication system can not only attract new individual users, but also attract professional users for operators.
  • the main characteristics of trunking communication require short call connection time and fast channel acquisition.
  • the traditional CDMA system capture method uses serial acquisition method.
  • the base station subsystem is sending out the extended channel 4 to eliminate it, "(Extended Channe l As si gnmen t Message (ECAM for short), send empty frames to the end user on the assigned service channel.
  • ECAM Extended Channe l As si gnmen t Message
  • the end user switches to the forward service channel and receives at least two consecutive good empty channels.
  • the prefix frame is started to be sent on the reverse channel.
  • the base station subsystem After the base station subsystem captures the reverse channel, it sends a base station response order (BSAckOrder) message to the end user, and indicates in the base station response order message that the message needs reverse confirmation; The end user sends a terminal response order (MSACKOrder) message to respond, and indicates whether a base station confirmation is required.
  • BSAckOrder base station response order
  • MSACKOrder terminal response order
  • the above process is based on the pre-acquisition of the forward channel, otherwise the terminal will not send Forwarding a frame, but this serial process requires a long acquisition time.
  • the signaling handshake can only be performed after the entire acquisition process is completed. This increases the call setup time and cannot meet the requirements for rapid call setup in trunked calls.
  • the trunking communication is generally mainly used for emergency dispatch, such as maritime rescue, military dispatch, public safety command, emergency dispatch, etc.
  • emergency dispatch such as maritime rescue, military dispatch, public safety command, emergency dispatch, etc.
  • the traditional cellular mobile communication system can only meet the call setup time of ordinary users. Requirements, can not meet the needs of cluster users to respond quickly.
  • the ordinary call establishment process must be modified to reduce the capture time and achieve the fast call establishment requirements of digital trunked communication systems.
  • CDMA Code Division Multiple Access
  • the purpose of the present invention is to provide a method for quickly establishing a call in a digital trunking communication system, which overcomes the shortcomings of the prior art that the fast access and call functions cannot be implemented in a CDMA digital trunking system, and realizes the establishment of a fast call.
  • the present invention provides a method for quickly establishing a call in a digital trunking communication system, including the following steps:
  • Step 1 The end user initiates a PTT call
  • Step 2 The base station receives the PTT call request, allocates channel resources for the call, establishes a forward traffic channel according to the channel allocation, sends an empty frame on the forward traffic channel, and simultaneously sends an extended channel assignment message to the terminal. Specify the assigned traffic channel;
  • Step 3 After receiving the extended channel assignment message, the end user turns on the receiver to track and capture the forward traffic channel, and at the same time sends one or more than one reverse traffic channel or reverse pilot frequency.
  • Prefix frame
  • Step 4 The base station or terminal performs a service channel acquisition operation. If the acquisition is successful, the call establishment is successful. If the acquisition fails, the call establishment fails and the release process is initiated.
  • the process of acquiring the traffic channel includes the following steps:
  • Step 4a The base station sends a base station response order (BSAckOrder) message to the terminal, and requests the terminal to confirm it.
  • BSAckOrder base station response order
  • Step 4b If the base station receives the response command (SAckOrder) message sent by the terminal, the capture of the service channel is completed, the base station and the terminal enter the service channel, and the call is successfully established; if the base station does not receive the MSAckOrder message sent by the terminal, the service channel If the capture fails, the call establishment fails and the release process is initiated.
  • SAckOrder response command
  • the process of acquiring the service channel includes the following steps:
  • Step 4a ' The terminal sends a final MSAckOrder message to the base station, and the base station is required to respond.
  • Step 4b' If the terminal receives the BSAckOrder message sent by the base station, the acquisition of the service channel is completed, the base station and the terminal enter the service channel, and the call is established. Succeeded; if the terminal does not receive the response instruction message sent by the base station, and the acquisition of the service channel fails, the call establishment fails and the release process is initiated.
  • the base station and the terminal In the operation of acquiring the traffic channel described in step 4, if the base station and the terminal simultaneously capture the corresponding reverse traffic channel and the forward traffic channel, the base station and the terminal send confirmation to each other at the same time, and the base station and the terminal respectively return confirmation When the base station and the terminal respectively receive the acknowledgement message sent by the other party, the acquisition of the traffic channel is completed, the base station and the terminal enter the traffic channel, and the call is successfully established.
  • the method of the present invention adopts a method in which a signaling handshake and a channel acquisition are performed simultaneously, so that the signaling handshake is advanced, the call connection time is reduced, and a method for rapid call establishment is implemented.
  • the base station does not use the traditional method of sending empty frames during the capture process, but directly sends
  • the mobile station After receiving two consecutive good frames, the mobile station sends a MSAckOrder instead of sending a prefix frame after the BSAckOrder message.
  • This signaling method is used to advance the handshake to make the service channel
  • the acquisition process and signaling handshake are performed at the same time, which saves the connection time of the cluster users, and overcomes the shortcomings of the longer connection time in the CDMA system, which does not meet the needs of the cluster business.
  • FIG. 1 is a flowchart of a method for quickly establishing a call in a digital trunking system according to the present invention
  • FIG. 2 is a schematic diagram of message interaction according to an embodiment of the present invention. detailed description
  • a parallel acquisition method provided by the present invention realizes fast access of trunked group calls and private calls.
  • the base station of the BSS base station subsystem
  • a call request is received, and channel resources are allocated for this call.
  • a forward traffic channel is established according to the channel allocation, and an extended channel assignment message ECAM is sent over the air to specify the assigned traffic channel for the terminal, and at the same time, an empty frame is sent to the forward traffic channel.
  • ECAM extended channel assignment message
  • the end user turns on the receiver to track and capture the forward traffic channel, and sends several prefix frames directly on the reverse traffic channel or reverse pilot frequency without receiving two consecutive good frames. Send after Prefix frame.
  • the base station and the terminal respectively send an empty frame and a prefix frame.
  • the terminal may capture the forward service frame first. If the base station first captures successfully, then the base station sends a confirmation message BSAckOrder to the terminal, and the terminal is required to confirm the message.
  • the terminal After receiving the confirmation message from the base station, the terminal returns a reverse message MSAckOrder to the base station to confirm; Then, the terminal first sends a confirmation message MSAckOrder to the base station subsystem, and requires the base station to confirm the message, and then the base station returns a confirmation message BSAckOrder to the terminal for confirmation after receiving the confirmation message from the terminal.
  • the base station and the terminal capture at the same time and may send acknowledgments at the same time, they will acknowledge each other. This situation will be slow, but the chance of this happening is very small. Thus, the acquisition process of the service channel is completed, and the entire acquisition process is performed in parallel.
  • the invention is used in a CDMA-based trunking system in order to achieve rapid call establishment, and overcomes the disadvantages that the traditional serial capture and one-way service channel message confirmation mechanism takes a long time, and adopts a parallel capture channel method to speed up User call access time.
  • Step 1 The end user presses the PTT button to apply for a PTT call.
  • the call is a group call or a private call.
  • Step 2 The base station receives a call request to allocate a channel to establish a forward traffic channel, and sends a blank frame on the traffic channel; at the same time, the base station sends an extended channel assignment message ECAM to the terminal;
  • Step 3 After receiving the ECAM message, the terminal turns on the receiver to track and capture the forward traffic channel, and immediately sends a prefix frame on the reverse traffic channel or reverse pilot channel;
  • Step 4 Is the base station capturing the reverse traffic channel first? If yes, go to step 4a, if not, go to step 4 ';
  • Step 4a The base station sends BSAckOrder information to the terminal, and requires the terminal to respond, and the base station Waiting for a response from the terminal;
  • Step 4b Does the base station receive a response message from the terminal? If received, go to step 5; if not received, go to step 5 ';
  • Step 4 ' Is the terminal capturing the forward traffic channel first? If yes, go to step 4a ", if not, go to step 4a ';
  • Step 4a the terminal sends an MSAckOrder to the base station, and requests the base station to respond; the terminal waits for a response from the base station;
  • Step 4b ' Does the terminal receive the response message from the base station? If received, go to step 5; if not, go to step 5 ';
  • Step 4a the base station and the terminal simultaneously capture a traffic channel, and the base station and the terminal respectively send a confirmation and wait for the other party to return a confirmation;
  • Step 4b whether to return confirmation? If yes, go to step 5; if no, go to step 5 ';
  • Step 5 The service channel is successfully acquired, and the call is successful.
  • Step 5 ' The service channel acquisition fails, and the call fails.
  • FIG. 2 is a schematic diagram of message interaction according to an embodiment of the present invention in which a base station successfully captures a reverse traffic channel as an example.
  • the message interaction process is as follows:
  • the base station allocates channel resources and physical resources of the call, establishes a forward traffic channel according to the allocated resources, and sends an empty frame to the terminal on the forward traffic channel;
  • the base station constructs the extended channel assignment message ECAM according to the call type and the allocated channel resources, it sends a channel assignment message to the terminal on the paging channel;
  • the terminal receives the extended channel assignment message ECAM of the base station, obtains the channel attributes of the call, and tracks and captures the forward traffic channel according to the channel attributes. At the same time, the terminal opens the transmitter to send on the reverse traffic channel or the reverse pilot channel.
  • ECAM extended channel assignment message
  • the terminal If the terminal is an IS95 terminal and the wireless configuration is RC1 or RC2, the terminal transmits a prefix frame on the reverse traffic channel;
  • the terminal If the terminal is a CDMA200Q terminal and the wireless configuration is RC3, the terminal sends a prefix frame on the reverse pilot channel;
  • the terminal and the base station begin to enter the parallel acquisition channel phase. If the base station successfully captures the reverse traffic channel, it sends a BSAckOrder message to the terminal, and the message requires the terminal to confirm; at the same time, a timer is set at the LAC layer.
  • the channel acquisition fails, the call establishment is not successful, and the release process is entered;
  • the terminal receives the BSAckOrder message from the base station, and its message field ACK_REQ is equal to 1. Knowing that the base station message needs reverse confirmation, it sends MSAckOrder to the base station for confirmation. The JL MSAckOrder message does not need to be confirmed again, and the ACK-REQ is equal to 0;
  • the base station receives the MSAckOrder message sent by the terminal, the traffic channel acquisition is completed, the base station and the terminal enter the traffic channel, and the call is successfully established.
  • the terminal does not receive the BSAckOrder message of the base station when the terminal receives two consecutive good frames, it means that the terminal captured the channel before the base station, and then enter the process of the terminal capturing first.
  • the processing method is the same as that of the base station.
  • the LAC layer timer is set.
  • the CDMA-based trunking communication system uses the third-generation system technology of mobile communication, which has a large space for technical and business development.
  • the method proposed by the present invention is based on mature CDMA technology and does not change the physical mechanism of the air interface. The application is modified.
  • the present invention adopts a parallel capture method to speed up the call establishment time.
  • the present invention can not only meet the requirements for the fast call establishment time in a CDMA-based trunking system, but also speed up the call establishment process in an ordinary CDMA2000 system. It is also useful.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

一种数字集群通信系统呼叫快速建立的方法 技术领域
本发明涉及一种移动通信系统呼叫建立的方法， 尤其是一种 CDMA ( Code Divi s ion Mul t iplex Acces s , 码分多址）制式的集群移动通信系统中呼叫快 速建立的方法。 背景技术
在日益多样化的社会需求推动下， 移动通信技术从模拟通信系统， 发展 到目前广泛应用的第二代移动通信系统和 2. 5代移动通信系统， 一直到即将 大规模应用的第三代移动通信系统， 移动通信技术的发展不仅满足了人们对 于话音业务的需求， 更越来越有效的满足着包括影像、 音频、 实时多媒体业 务交互等增值型业务的需求， 从而使得移动通信系统在人们的生活和工作中 发挥着越来越重要的作用。 其中， 集群通信已经日益成为一个不可或缺的业 务内容， 数字集群系统是移动通信系统的一个重要分支， 是多用户共享一组 无线信道， 并动态使用这些信道的专用移动通信系统。
在 CDMA2000系统中实现集群业务的方法包括群组呼叫和私密呼叫， 是集 群系统中重要的业务特征， 群组呼叫即单用户可以在允许的时候与组内的所 有人同时通话。 组内用户， 除了正在说话的人以外， 其他人必须都在收听， 而且组内的用户一旦有人按下 PTT ( Push To Talk )键， 其他人如果优先级和 正在说话的人的优先级相同， 则不能抢断， 只能等待说话的人完成这次通话 过程。 私密呼叫是一对一的用户呼叫， 在一个组中， 也可以选择想要进行通 话的对象进行通话， 而不被组内的其他人员收听到。 CDMA制式的集群系统对 于集群呼叫业务采用分组数据通道， 即采用以太网传输的方式实现快速的呼 叫建立， 而不是传统的电路域采用电路交换的方式。 为了满足集群群组呼叫 和私密呼叫的要求， CDMA制式的集群系统采用快速呼叫接入的方式。 CDMA制 式的集群通信系统特点是采用半双工的通信方式， 可以实现快速的接续， 并 支持群组呼叫， 即一对多的呼叫方式。 在集群通信中， 要求群组内用户在同 一小区内需共享前向信道， 群组用户呼叫或讲话时， 只要按住 PTT键， 便可 以和组内的其他用户进行通话， 这种 PTT业务广泛的应用于对讲系统、 集群 系统， 为集团用户提供指挥调度功能。 例如公安、 消防、 交通运输、 机场航 空、 建筑工地、 大型集会， 军事调度等。 随着社会的进步、 人员流动性的增 强， 伴随着移动通信技术的快速发展， 个人通信的领域越来越广， 集群业务 也逐渐转向个人应用， 例如年轻时尚人士之间或小团体内的聊天、 家庭内部 成员之间的通信等。 CDMA制式的集群通信系统， 不仅可以吸引新的个人用户， 更可以为运营商吸引一些专业用户。
集群通信最主要的特点要求呼叫的接续时间短、 能快速捕获信道， 但是 传统的 CDMA系统的捕获方式采用串行捕获的方法， 基站子系统在发送扩展信 道 4旨酉己消， ' ( Extended Channe l As s i gnmen t Mes sage , 简称 ECAM )后， 在 分配的业务信道上向终端用户发送空帧， 终端用户进行 ECAM消息处理后， 转 向前向业务信道， 在至少收到两个连续好的空帧后， 开始在反向信道上发送 前缀帧， 基站子系统在捕获反向信道后， 向终端用户发送基站应答指令 ( BSAckOrder ) 消息， 并在基站应答指令消息中指明该消息需要反向证实； 终端用户发送终端应答指令（MSACKOrder ) 消息进行应答， 并指明是否需要 基站证实。 上述过程是以终 捕获前向信道为前提的， 否则终端不会发送反 向前缀帧， 但是这种串行流程， 捕获时间长， 信令握手需要在整个捕获过程 完成之后才能够进行， 增加了呼叫建立的时间， 无法满足集群呼叫中呼叫快 速建立的要求。 另外， 由于集群通信一般主要用于应急调度， 比如海事急救、 军队调度、 公共安全指挥、 抢险调度等， 对时间的要求十分迫切， 传统的蜂 窝移动通信系统对呼叫建立时间只能满足普通用户的要求， 不能满足集群用 户快速响应的需求， 为了实现集群通信快速响应的要求， 必须对普通的呼叫 建立流程进行改造， 减少捕获的时间， 实现数字集群通信系统的快速呼叫建 立要求， 目前在基于 CDMA技术的数字集群系统中尚无有效的呼叫快速建立的 方法。 发明内容
本发明的目的在于提供一种数字集群通信系统呼叫快速建立的方法， 克 服现有技术存在的在 CDMA制式数字集群系统中无法实现快速接入和呼叫功能 的缺点， 实现快速呼叫的建立。
为实现上述目的， 本发明提供一种数字集群通信系统呼叫快速建立的方 法， 包括以下步骤：
步骤 1、 终端用户发起一次 PTT呼叫；
步骤 2、 基站接收到所述的 PTT呼叫请求， 为本次呼叫分配信道资源， 根 据信道的分配建立前向业务信道， 在前向业务信道发送空帧， 同时发送扩展 信道指配消息， 为终端指定分配的业务信道；
步骤 3、 终端用户接收到扩展信道指配消息后， 打开接收机对前向业务信 道进行跟踪捕获， 同时在反向业务信道或反向导频上发送一个或一个以上的 前缀帧；
步骤 4、 基站或终端进行业务信道的捕获操作， 如果捕获成功， 则本次呼 叫建立成功， 如果捕获失败， 则本次呼叫建立失败进入释放流程。
在步骤 4 中所述的进行业务信道的捕获操作中， 若是基站先捕获反向业 务信道， 则所述业务信道的的捕获操作过程包括以下步骤：
步骤 4a、 基站向终端发送基站应答指令（BSAckOrder ) 消息， 并且要求 终端回证实；
步骤 4b、 若基站接收到终端发送的应答指令 ( SAckOrder ) 消息， 则业 务信道的捕获完成， 基站和终端进入业务信道， 本次呼叫建立成功； 若基站 没有接收到终端发送的 MSAckOrder消息， 业务信道的捕获失败， 则本次呼叫 建立失败进入释放流程。
在步骤 4 中所述的进行业务信道的捕获操作中， 若是终端先捕获前向业 务信道， 则所述业务信道的的捕获操作过程包括以下步骤：
步骤 4a'、 终端向基站发送终 MSAckOrder消息， 并且要求基站回响应； 步骤 4b'、 若终端接收到基站发送的 BSAckOrder消息， 则业务信道的捕 获完成， 基站和终端进入业务信道， 本次呼叫建立成功； 若终端没有接收到 基站发送的应答指令消息， 业务信道的捕获失败， 则本次呼叫建立失败进入 释放流程。
在步骤 4 中所述的进行业务信道的捕获操作中， 若是基站和终端同时捕 获到对应的反向业务信道和前向业务信道， 则基站和终端同时向对方发送证 实，基站和终端分别回证实； 当基站和终端分别接收到对方发送的回证实消 息， 则业务信道的捕获完成， 基站和终端进入业务信道， 本次呼叫建立成功。 本发明所述方法采用信令握手和信道捕获同时进行的方式， 使得信令握 手提前， 减少呼叫接续时间， 实现快速呼叫建立的方法。 在捕获接入过程中， 基站在捕获过程中， 不是采用传统的发送空帧的方法， 而是直接发送
BSAckOrder信令的方式， 移动台在接收到连续两个好帧， 在 BSAckOrder消息 之后， 不是发送前缀帧， 而是发送 MSAckOrder进行应答的方式， 采用这种信 令握手打提前的方式， 使得业务信道的捕获过程和信令握手同时进行， 节省 了集群用户的接续时间， 克服了 CDMA系统中接续时间较长， 不满足集群业务 需求的缺陷。
以下结合附图和具体实施例对本发明的技术方案进一步说明。 附图说明
图 1为本发明所述数字集群系统呼叫快速建立方法的流程图；
图 2是本发明一个实施例的消息交互示意图。 具体实施方式
本发明提出的一种并行捕获的方法实现集群群组呼叫和私密呼叫的快速 接入， 当用户按下 PTT键发起一次 PTT的群组呼叫或者私密呼叫的时候， BSS (基站子系统） 的基站接收到呼叫请求， 为本次呼叫分配信道资源。 根据信 道的分配建立前向业务信道， 并在空中发送扩展信道指配消息 ECAM, 为终端 指定分配的业务信道， 同时在前向业务信道发送空帧。 终端用户在收到 ECAM 消息后， 打开接收机对前向业务信道进行跟踪捕获的同时， 直接在反向业务 信道或反向导频上发送若干前缀帧， 而不需要收到连续的两个好帧后才发送 前缀帧, 此时， 基站和终端分别发送空帧和前缀帧。 在捕获过程中， 不一定 是基站先捕获反向的业务帧， 有可能终端先捕获前向业务帧。 如果基站先捕 获成功后， 那么基站先发送证实消息 BSAckOrder给终端， 并且要求终端对消 息进行证实， 那么终端收到基站的证实消息以后给基站回反向消息 MSAckOrder 进行证实； 如果终端先捕获成功后， 那么终端先发送证实消息 MSAckOrder给基站子系统， 并且要求基站对消息证实， 那么基站收到终端的 证实消息以后给终端回证实消息 BSAckOrder进行证实。 若基站和终端同时捕 获， 可能同时发送证实，则各自回证实， 这种情况会慢， 但是发生这种情况的 几率很小。 从而完成业务信道的捕获过程， 整个捕获过程并行进行。
本发明用于在 CDMA制式的集群系统中为了实现快速的呼叫建立， 克'服传 统的串行捕获和单向业务信道消息证实机制耗时较长的缺陷， 采用并行捕获 信道的方法， 加快了用户的呼叫接入时间。
具体流程如图 1所示：
步骤 1、 终端用户按下 PTT键， 申请发起一次 PTT呼叫， 该呼叫为群组呼 叫或私密呼叫；
步骤 2、基站收到呼叫请求进行分配信道建立前向业务信道， 并在业务信 道发空帧； 同时， 基站向终端发送扩展信道指配消息 ECAM;
步骤 3、 终端在收到 ECAM消息后， 打开接收机对前向业务信道进行跟踪、 捕获的同时， 立即在反向业务信道或反向导频信道上发送前缀帧；
步骤 4、 是否是基站先捕获反向业务信道？ 如果是， 转向步骤 4a , 如果 不是， 转向步骤 4'；
步骤 4a、 基站向终端发送 BSAckOrder信息， 并且要求终端回响应， 基站 等待终端的响应；
步骤 4b、 基站是否接收到终端的应答消息？ 如果接收到转向步骤 5 ; 如 杲没有接收到， 转向步骤 5'；
步骤 4'、 是否是终端先捕获前向业务信道？ 如果是， 转向步骤 4a" , 如 果不是， 转向步骤 4a' ;
步骤 4a'、 终端向基站发送 MSAckOrder , 并且要求基站回响应； 终端等 待基站的响应；
步骤 4b'、 终端是否接收到基站的应答消息？ 如果接收到转向步骤 5 ; 如 果没有接收到， 转向步骤 5'；
步骤 4a"、 基站和终端同时捕获业务信道， 基站和终端分别发送证实，并 等待对方的返回证实；
步骤 4b"、 是否返回证实？ 如果返回， 转向步骤 5 ; 如果没有返回， 转向 步骤 5'；
步骤 5、 业务信道捕获成功， 本次呼叫成功；
步骤 5'、 业务信道捕获失败， 本次呼叫失败。
图 2 为本发明以基站先成功捕获反向业务信道为实施例的消息交互示意 图， 消息交互的过程为：
终端用户按下 PTT键， 向基站发起一个组呼或者私密呼叫请求； 基站接收到组呼或者私密呼叫起呼消息， 根据本次呼叫的业务选项 SO ( Serv i ce Opt ion ), 判断为一次组呼或私密呼， 基站分配本次呼叫的信道资 源和物理资源， 根据分配的资源建立前向业务信道， 并在前向业务信道上向 终端发送空帧； 基站根据呼叫类型和分配的信道资源， 构造扩展信道指配消息 ECAM后， 在寻呼信道上向终端发送信道指配消息；
终端收到基站的扩展信道指配消息 ECAM, 得到本次呼叫的信道属性， 根 据信道属性对前向业务信道进行跟踪、 捕获， 同时终端打开发射机在反向业 务信道或反向导频信道上发送前缀帧；
如果终端是 I S95终端， 无线配置是 RC1或 RC2 , 则终端在反向业务信道 上发射前缀帧；
如果终端是 CDMA200Q终端， 无线配置是 RC3 , 则终端在反向导频信道上 发送前缀帧；
至此， 终端和基站开始进入并行捕获信道阶段， 如果基站成功捕获反向 业务信道后， 向终端发送 BSAckOrder消息， 并且该消息要求终端进行证实； 同时， 在 LAC层设置定时器。
如果出现异常， 基站在定时器范围内， 没有得到终端的证实消息， 则捕 获信道失败， 本次呼叫建立不成功， 进入释放流程；
终端收到基站的 BSAckOrder消息， 其消息字段 ACK— REQ等于 1 , 知道基 站消息需要反向证实， 则向基站发送 MSAckOrder 进行证实， JL MSAckOrder 消息不需要再证实， ACK-REQ等于 0;
基站收到终端发送 MSAckOrder消息， 业务信道捕获完成， 基站和终端进 入业务信道， 本次呼叫建立成功。
如果在终端收到两个连续好帧的时候，没有收到基站的 BSAckOrder消息， 说明终端先于基站捕获了信道， 则进入终端先捕获的流程。 处理方式和基站 相同， 在发送要求证实的消息 MSAckOrder后， 设置 LAC层定时器。 CDMA制式的集群通信系统采用移动通信的第三代系统技术， 具有较大的 技术和业务发展空间； 本发明提出的方法基于成熟的 CDMA技术， 不改变空中 接口的物理机制， 仅对空中接口的应用进行修改， 本发明采用并行捕获的方 式， 加快了呼叫的建立时间， 本发明不仅仅能够满足 CDMA制式的集群系统中 快速呼叫建立的时间的要求， 对于在普通 CDMA2000系统中加快呼叫的建立过 程也有使用价值。
最后所应说明的是， 以上实施例仅用以说明本发明的技术方案而非限 制， 尽管参照较佳实施例对本发明进行了详细说明， 本领域的普通技术人员 应当理解， 可以对本发明的技术方案进行修改或者等同替换， 而不脱离本发 明技术方案的精神和范围， 其均应涵盖在本发明的权利要求范围当中。-

Claims

权利要求
1、 一种数字集群通信系统呼叫快速建立的方法， 其特征在于， 包括以下 步骤：
步骤 1、 终端用户发起一次 PTT呼叫；
步骤 2、 基站接收到所述的 PTT呼叫请求， 为本次呼叫分配信道资源， 根 据信道的分配建立前向业务信道， 在前向业务信道发送空帧， 同时发送扩展 信道指配消息， 为终端指定分配的业务信道；
步骤 3、 终端用户接收到扩展信道指配消息后， 打开接收机对前向业务信 道进行跟踪捕获， 同时发送一个或一个以上的前缀帧；
步骤 4、 基站或终端进行业务信道的捕获操作， 如果捕获成功， 则本次呼 叫建立成功， 如果捕获失败， 则本次呼叫建立失败进入释放流程。
2、 根据权利要求 1所述的数字集群通信系统呼叫快速建立的方法， 其特 征在于， 在步骤 4 中基站或终端进行业务信道的捕获操作时， 若是基站先捕 获反向业务信道， 则所述业务信道的的捕获操作过程包括以下步骤：
步骤 4a、 基站向终端发送基站应答指令消息， 并且要求终端回证实； 步骤 4b、 若基站接收到终端发送的应答指令消息， 则业务信道的捕获完 成， 基站和终端进入业务信道， 本次呼叫建立成功； 若基站没有接收到终端 发送的应答指令消息， 业务信道的捕获失败， 则本次呼叫建立失败进入释放 流程。
3、 根据权利要求 2所述的数字集群通信系统呼叫快速建立的方法， 其特 征在于， 所述步骤 4a中， 基站向终端发送基站应答指令消息同时， 在 LAC层 设置定时器， 并计时； 在步骤 4 b中， 若基站在定时器范围内接收到终端发送 的应答指令消息， 则业务信道的捕获完成， 基站和终端进入业务信道， 本次 呼叫建立成功； 若基站在定时器范围内没有接收到终端发送的应答指令消息， 业务信道的捕获失败， 则本次呼叫建立失败进入释放流程。
4、 根据权利要求 1所述的数字集群通信系统呼叫快速建立的方法， 其特 征在于， 在步骤 4 中基站或终端进行业务信道的捕获操作时， 若是终端先捕 获前向业务信道， 则所述业务信道的的捕获操作过程包括以下步骤：
步骤 4a'、 终端向基站发送终端应答指令消息， 并且要求基站回响应； 步骤 4b'、若终端接收到基站发送的应答指令消息， 则业务信道的捕获完 成， 基站和终端进入业务信道， 本次呼叫建立成功； 若终端没有接收到基站 发送的应答指令消息， 业务信道的捕获失败， 则本次呼叫建立失败进入释放 流程。
5、 根据权利要求 4所述的数字集群通信系统呼叫快速建立的方法， 其特 征在于， 所述步骤 4a'中， 终端向基站发送终端应答指令消息同时， 在 LAC层 设置定时器， 并计时； 在步骤 中， 若终端在定时范围内接收到基站发送的 应答指令消息， 则业务信道的捕获完成， 基站和终端进入业务信道， 本次呼 叫建立成功； 若终端在定时范围内没有接收基站到发送的应答指令消息， 业 务信道的捕获失败， 则本次呼叫建立失败进入释放流程。
6、 根据权利要求 1所述的数字集群通信系统呼叫快速建立的方法， 其特 征在于， 在步骤 4 中基站或终端进行业务信道的捕获操作时， 若是基站和终 端同时捕获到对应的反向业务信道和前向业务信道， 则基站和终端同时向对 方发送证实，基站和终端分别回证实； 当基站和终端分别接收到对方发送的回 证实消息， 则业务信道的捕获完成， 基站和终端进入业务信道， 本次呼叫建 立成功。
7、 根据权利要求 1所述的数字集群通信系统呼叫快速建立的方法， 其特 征在于， 所述的步骤 3 中， 终端用户发送一个或一个以上的前缀帧时， 如果 终端是 IS95终端， 无线配置是 RC1或 RC2， 则终端在反向业务信道上发射前 缀帧； 如果终端是 CDMA2000终端， 无线配置是 RC3, 则终端在反向导频信道 上发送前缀帧。
8、 根据权利要求 1 所述的数字集群通信系统呼叫快速建立的方法， 其 特征在于， 所述步骤 1中的 PTT呼叫为群组呼叫或私密呼叫。
PCT/CN2004/001568 2004-06-12 2004-12-29 Procede d'etablissement d'appel rapide pour systemes de communication numeriques a ressources partagees WO2005122599A1 (fr)

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