WO2004110085A1 - A trunked communication method - Google Patents

A trunked communication method Download PDF

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Publication number
WO2004110085A1
WO2004110085A1 PCT/CN2003/000453 CN0300453W WO2004110085A1 WO 2004110085 A1 WO2004110085 A1 WO 2004110085A1 CN 0300453 W CN0300453 W CN 0300453W WO 2004110085 A1 WO2004110085 A1 WO 2004110085A1
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WIPO (PCT)
Prior art keywords
group
terminal
call
base station
long code
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PCT/CN2003/000453
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English (en)
French (fr)
Inventor
Jia An Yang
Xue Min Liu
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ZTE Corp
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ZTE Corp
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Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to AU2003242209A priority Critical patent/AU2003242209A1/en
Priority to PCT/CN2003/000453 priority patent/WO2004110085A1/zh
Publication of WO2004110085A1 publication Critical patent/WO2004110085A1/zh
Anticipated expiration legal-status Critical
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    • 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 present invention relates to a wireless communication system, and in particular, to a trunked communication method based on a CDMA2000 communication system.
  • Trunking communication is a special dispatching communication method, including dedicated command and dispatching communication. It is a communication method that appeared very early.
  • the development of the trunking communication system has gone through a pair of walkie-talkies, a single-frequency simplex networking, an inter-frequency single (dual) duplex networking, a single-channel one-call response, a system with selective calling, and a multi-channel automatic dialing system.
  • the cluster communication mainly implements group calls between cluster users, and the cluster users can directly join the call without receiving a response from other users.
  • the trunking communication system is divided into an analog trunking communication system and a digital trunking communication system in accordance with the internal technical standards.
  • the digital trunking communication system adopts digital processing methods in terms of signaling, multiple access methods, voice coding technology, modulation and demodulation technology, synchronization technology, error detection and correction technology, and diversity technology.
  • iDEN digital trunking communication system and Terrestrial Trunked Radio (TETRA) communication system. These two trunking communication systems use TDMA multiple access technology.
  • iDEN digital trunking communication system is developed and produced by American Motorola Company, and its working frequency band is 800 bands.
  • TETRA communication system adopts the European Telecommunications Standards Institute ETSI recommendation It is a digital trunking communication standard with an operating frequency band of 400MHz or 80Hz, which is an open air signaling interface system. It adopts advanced codebook excitation linear prediction coding ACELP and / or differential orthogonal shift keying modulation QPSK technology.
  • ETSI European Telecommunications Standards Institute
  • ACELP advanced codebook excitation linear prediction coding ACELP and / or differential orthogonal shift keying modulation QPSK technology.
  • iDEN digital trunking communication system and TETRA digital trunking communication system use TOMA's multiple-access method, affected by TOMA technology itself, the system's capacity is limited. Although the capacity can be increased by sacrificing voice quality, it still cannot meet the growing demand. Communication needs.
  • a mobile communication system and a method for implementing trunking services proposes a circuit-domain trunking communication technology based on CLA.
  • This technology uses the addition of conference television equipment on the switch side and the addition of a security algorithm.
  • the voice is encrypted, but because the system still uses separate air channels for each cluster user, the system capacity in a single cell becomes the bottleneck of the cluster capacity.
  • the conference television equipment itself such as a single group
  • the low capacity of group users and the inability to perform priority scheduling make this technology only suitable for the communication needs of 20-30 nodes. Therefore, it cannot meet the requirements for cluster communication in practical applications, such as flood control and rescue command. Tens of thousands of groups communicate.
  • the CDMA2000 system has a broadband spread-spectrum air interface, which can not only provide traditional voice services, but also high-speed packet data services. Because this system uses reverse pilot technology, air coding method, diversity reception technology and fast power control technology, it increases the modulation and demodulation gain of the channel and reduces interference to other users, so the spectrum utilization of the CDMA2000 system is obtained. The increase ensures that there is no need to reduce the number of original voice users while supporting multiple high-speed data users. In addition, the unique soft handover function of the CDMA system can ensure more data services. Plus stable delivery.
  • the CDMA OQ system due to its broadband spread-spectrum air interface and reverse pilot technology, makes it possible to increase the capacity of the trunking system. If the technology of the CDMA2000 system can be combined with the trunking system, not only can the technical advantages of the CDMA2000 technology be used, It can also implement the user's cluster business requirements.
  • the technical problem to be solved by the present invention is to provide a cluster communication method based on a CDMA2000 communication system, which overcomes the problem of limited cluster system capacity caused by the use of wireless resources by cluster users in the prior art.
  • the trunking communication method according to the present invention is applied to a CDMA200Q mobile communication system.
  • the communication system includes a base station system consisting of at least one base transceiver station and a base station controller, a core network device, and a cluster server.
  • the base transceiver station has a cluster control function; the basic idea of the trunking communication method is that the base station system allocates a common forward service channel to the same group under the same cell, and the group terminals use a common long code mask to monitor the common
  • the forward service channel uses a service channel in the reverse direction to provide reverse service support for group terminals through scheduling.
  • the specific steps include: the terminal initiates a cluster call request, and the base station sends the call request to the cluster server; the cluster server searches for the location Describe the group terminal called by the terminal and its location information, and notify the base station of the cell location information of the group terminal called by the terminal; the base station assigns a common forward traffic channel to each cell where the group terminal is located; the cluster The server notifies the base station of the group's common long code mask / Or said terminal group; trunking server by the base station to the terminal has the right to speak is assigned a reverse traffic channel; the terminal groups using a common long code mask listening to the forward common traffic channel.
  • the cluster server notifies the base station and / or the group terminal of the common long code mask of the group.
  • the steps include: the cluster server judges whether the public long code mask of the group has been agreed, that is, whether the determined serial number is registered as the public long code mask of the group when the terminal applies for service, and if it is agreed, the base station is notified to use the public long code mask. Long code mask; if there is no agreement, the cluster server constructs a common long code mask, notifies the base station, and notifies the corresponding group terminal of the common long code mask through an air message.
  • the step of the cluster server allocating a reverse traffic channel to the terminal with a voice branch through the base station further includes: the cluster server judges whether the cluster call is the first call of the group, and if so, notifies the base station that there is a voice
  • the right terminal establishes a reverse traffic channel; if not, the cluster server judges whether there are other terminals in the group currently talking, and if not, it notifies the base station to establish a reverse traffic channel for the terminal initiating the call; if If yes, the cluster server judges whether the priority of the terminal initiating the call is higher than the priority of the terminal in the call, and if the priority of the terminal initiating the call is high, the base station is notified to forcibly remove the user currently in the call
  • the reverse traffic channel establishes a reverse traffic channel for a terminal with a high priority; if the priority of the terminal initiating the call is low, the current call state is maintained.
  • the common long code mask includes two types: a long code mask for a non-full group call and a long code mask for a full group call; the long code mask for the non full group call is used for a called terminal A trunk call when the terminal is part of a group, and the long code mask of the full group call is used for a trunk call when the called terminal is all the terminals of the group.
  • the invention adopts a common forward service channel method in the same cell, so that a cluster group can use only one forward channel in a cell, and a cluster group uses only one reverse service channel, so that the original limitation is
  • the digital trunking system with the number of users in the area has become a system with unlimited number of users in a single group, which greatly increases the system capacity of trunking communication and reduces the system of trunking communication.
  • the traffic congestion probability fundamentally solves the problem of cell capacity limitation in digital trunking systems.
  • FIG. 1 is a structure diagram of a system adopting a cluster communication method of the present invention
  • FIG. 3 is a schematic diagram of a common long code mask in the method of the present invention.
  • FIG. 4 is a flowchart of scheduling a reverse traffic channel in the method of the present invention.
  • the trunking communication method of the present invention can be used in a system as shown in FIG. 1 and includes a base station system, necessary core network equipment, and a cluster server.
  • the base station system includes at least one base transceiver station and one base station controller.
  • For the equipment that directly uses the MIMO200 () communication system for the base transceiver station and the base station controller, corresponding cluster control functions need to be added, such as processing of service options for trunk calls, and the terminal is a trunk user.
  • a cluster can include multiple groups, users of a group can be located in multiple cells, and a group can include more than one cluster user in a cell.
  • FIG. 2 is a flowchart of a cluster communication method according to the present invention.
  • the terminal A in FIG. 1 initiates a cluster call request through a reverse control channel.
  • the call request includes information of the called group terminal, and the cluster server may determine which group terminal sends which type of common long code mask to the call request. code.
  • the base station system determines that it is a trunk call according to the service option, and sends an initiation message to the trunk server.
  • the cluster server After the cluster server receives the call message, it searches for the group terminal called by terminal A and its location information, and notifies the base station of the location information of the group terminal called by terminal A, and the base station establishes one for each cell where these group terminals are located.
  • Common forward traffic channel The circle and multiple arrows in FIG.
  • the cluster server Call request to determine whether the common long code mask of the group has been agreed, that is, whether the determined serial number is registered as the common long code mask of the group when the terminal applies for service, and if it is agreed, the base station is notified to use the common long code Mask; if there is no agreement, the cluster server constructs a common long code mask, notifies the base station, and notifies the corresponding group terminal of the common long code mask through an air message.
  • the cluster server allocates a reverse traffic channel to a terminal with a voice right through the base station. In this embodiment, the terminal A has a speaking right.
  • terminal A uses the reverse traffic channel for communication, and other terminals use the group's common long code mask to demodulate the forward traffic channel of the cell in which they are located, and completes the group call process where terminal A speaks, and other terminals answer.
  • the terminal is not limited to the group terminal equipment under the base transceiver station. If another terminal applies for a call, a call request is sent to the base station through a reverse control channel, and the base station determines whether to allocate a reverse traffic channel used by the group to the terminal according to related information.
  • FIG. 3 is a schematic diagram of an embodiment of a common long code mask for a forward traffic channel according to the present invention, where 101 represents a long code mask specified by the CDMA2000 physical layer, the first 10 bits (41-32) are fixed to 1100011000, and the last 32 bits (31-0) is constructed according to the ESN of the terminal, which is generally an ESN out of order to distinguish different terminals.
  • 102 and 103 can be used as long code masks required by the trunk call sharing forward channel of the present invention.
  • the structure of the long code mask proposed by the present invention is: the long code mask has a total of 42 bits, and the upper 10 bits (41-32) are used to identify the call as a group call; the lower 32 bits (31-0) are divided into equal parts Two long parts: the first 16 bits (31-16) are used as the clustering group ID (TGID for short) of the cluster, and There are two cases of 16 bits (15-0): First, it is used as a user ID in the group (Trucking User ID, TUID for short), and is used for non-full group calls in the group. The maximum number of 16 consecutive 1s is reserved. Position, as shown in 102 in FIG. 3; the second is fixed at 16 ones, and is used for group calls in a group call, as shown in 103 in FIG.
  • the cluster server determines which type of common long code mask to send according to the information of the called group terminal in the cluster call message. For the first 10 digits, it can be fixed to Q011100111, which is exactly the bitwise negation of the single terminal mask specified in the CDMA2000 physical layer standard; any sequence that is different from the ordinary call identifier can also be used.
  • the mobile terminal After the mobile terminal is powered on, it enters an idle state after a certain assignment process (step 401), which can speed up the call speed of the trunk call and meet the extremely short call time requirement of the trunk call.
  • the base station or core network checks whether the idle timer has timed out (step 402) to avoid the situation where the cluster has stopped calling and still occupies related resources. If it has timed out, the group terminal resumes the idle state (step 410); if it does not time out, Then, the base station detects the reverse control channel to determine whether there is a new trunk call (step 403).
  • the base station or core network device resets the idle timer (step 404), and sends an initiation message to the trunk server.
  • the cluster server determines whether the call is the first call in the group, and if so, notifies the base station to establish a reverse service channel for the terminal, the group enters the active state, and completes a group call using the common forward service channel ( Step 409), and return to step 402 after the call ends; if not, the cluster server determines whether other terminals in the group are talking, and if not, the base station is notified to establish a reverse traffic channel for the terminal, and the group enters an active state, and Use the common forward service channel to complete a group call (step 409), and return to step 402 after the call ends.
  • the cluster server determines whether the priority of the group terminal that is newly applying for the call is higher than the priority of the terminal that is talking (step 407). If it is high, the base station is notified to forcibly dismantle the current call.
  • the reverse traffic channel of the calling terminal establishes a reverse traffic channel for the terminal with higher priority (step 408), completes a call, and returns to step 402 after the call ends. If the priority of the newly requested group terminal is low, the current call is maintained, and the process returns to step 402 after the call ends.

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

Description

一种集群通讯方法
技术领域
本发明涉及无线通讯系统， 具体地说， 涉及基于 CDMA2000通讯系统的 集群通讯方法。
背景技术
集群通讯是一种专用的调度通讯方式 包括专用指挥和调度通信，是很 早出现的一种通信方式。 集群通讯系统的发展历经一对一对讲机形式、 同频 单工組网形式、 异频单（双）工组网形式、 单信道一呼百应形式、 带选择呼 叫的系统以及多信道自动拨号系统， 近十年来， 又发展成为多信道用户共享 的系统。 集群通讯主要实现集群用户之间的群组呼叫， 并且集群用户可以不 需要得到其他用户的回应直接加入通话。
集群通讯系统按照其内部采用的技术制式，分为模拟集群通信系统和数 字集群通信系统。 数字集群通讯系统在信令、 采用的多址方式、 话音编码技 术、 调制解调技术、 同步技术、 检错纠错技术以及分集技术等方面均采用数 字处理方式。 目前广泛应用的两种数字集群系统是 iDEN数字集群通讯系统 和陆上集群无线电 TETRA ( Terres t t ia l Trunked Radio )通讯系统， 这两 种集群通讯系统均采用 TDMA的多址技术。 iDEN数字集群通讯系统是美国摩 托罗拉公司研制生产的， 其工作频段在 800匪 z , 采用矢量和激励线性预测 语音编码 VSELP和 16正交幅度调制 QAM技术； 而 TETRA通讯系统采用欧洲 电信标准协会 ETSI 推荐的数字集群通信标准， 其工作频段为 400MHz 或 80( Hz， 是一个空中信令接口开放的系统， 采用先进的码本激励线性预测编 码 ACELP和 /差分正交移项键控调制 QPSK技术。 对于上述两种系统， 当进行 集群呼叫时， 为每个集群用户单独分配空中信道， 即每个用户所使用的空中 信道是相互独立的， 因此系统的容量受限于空中接口的容量。 由于 iDEN数 字集群通讯系统和 TETRA数字集群通讯系统采用的是 TOMA的多址方式， 受 到 TOMA技术本身的影响， 造成系统的容量有限， 虽然可以通过牺牲话音质 量来增加容量， 但仍然无法满足日益增长的通信需求。
现有技术中也存在基于 CDMA制式的数字集群通讯系统， 中国专利申请
01132112. 1 "一种移动通信系统及其实现集群业务的方法"提出了一种基于 C丽 A 实现的电路域集群通讯技术， 该项技术采用了在交换机侧增加会议电 视设备， 并增加保密算法对语音进行加密处理， 但由于该系统仍然采用对每 个集群用户分配单独的空中信道，因此使得单小区下的系统容量成为集群容 量的瓶颈， 另外由于会议电视设备本身技术的限制， 如单群组用户容量低和 无法进行优先级调度等， 造成该项技术仅适合 20-30个结点的通信需求， 因 此无法满足实际应用中对集群通信的要求， 比如抗洪抢险指挥， 需要超过成 '千上万的群组进行通信。
由于在现有集群通讯系统中，均采用为每个用户单独分配空中信道的方 式， 而这些系统都是有空中容量限制的， 因此如果在一个小区下对几百或更 多用户进行集群呼叫， 这些系统是无法满足需要的。
随着移动通讯技术的发展， 第三代通讯技术已经日臻成熟， 例如 CDMA2000技术。 CDMA2000 系统具有宽带扩频空中接口， 不仅能提供传统的 话音业务， 而且能够提供高速的分组数据业务。 该系统由于采用了反向导频 技术、 空中编码方法、 分集接收技术和快速功率控制技术， 在增加信道的调 制解调增益的同时减少了对其他用户的干扰， 因此使得 CDMA2000 系统的频 谱利用率得到增加，保证了在支持多个高速数据用户的同时不必减少原有的 语音用户数目， 另外 CDMA系统所独有的软切换功能， 可以保证数据业务更 加稳定的传送。 CDMA OQ 系统由于其具有宽带扩频空中接口、 反向导频等 技术， 使得增加集群系统的容量成为可能， 如果能将 CDMA2000的系统的技 术与集群系统相结合， 不但可以发挥 CDMA2000技术的技术优势， 还可以实 现用户的集群业务要求。
发明内容
本发明所要解决的技术问题在于提供一种基于 CDMA2000通讯系统的集 群通讯方法，克服现有技术中集群用户单独使用无线资源带来的集群系统容 量有限的问题。 本发明所述集群通讯方法， 应用于 CDMA200Q移动通讯系统， 所述通讯 系统包括由至少一个基站收发信机和一个基站控制器构成的基站系统、核心 网设备和集群服务器， 所述基站收发信机和基站控制器具有集群控制功能； 所述集群通讯方法的基本思想是由基站系统为在同一小区下的同一群组分 配一条公用前向业务信道，群组终端使用公用的长码掩码监听公用前向业务 信道，在反向采用一条业务信道通过调度的方式为群组终端提供反向业务支 持， 其具体步骤包括： 终端发起集群呼叫请求， 基站将呼叫请求发给集群服 务器； 集群服务器查找所述终端呼叫的群组终端及其位置信息， 并将所述终 端呼叫的群组终端的小区位置信息通知基站；基站为所述群组终端位于的每 个小区分配一个公用前向业务信道；集群服务器将群组的公用长码掩码通知 基站和 /或所述群组终端； 集群服务器通过基站为有话语权的终端分配一个 反向业务信道； 所述群组终端使用公用长码掩码监听所述公用前向业务信 道。
所述集群服务器将群组的公用长码掩码通知基站和 /或所述群组终端的 步骤包括： 集群服务器判断群组的公用长码掩码是否已经约定， 即终端申请 服务时是否已登记确定的序列号作为群组的公用长码掩码， 如果已经约定， 则通知基站使用该公用长码掩码； 如果没有约定， 则集群服务器构造一个公 用长码掩码， 通知基站， 并通过空中消息把该公用长码掩码通知相应的群组 终端。
所述集群服务器通过基站为有话语杈的终端分配一个反向业务信道步 骤进一步包括： 集群服务器判断所述集群呼叫是否是所述群组的第一个呼 叫， 如果是， 则通知基站为有话语权的终端建立反向业务信道； 如果否， 则 集群服务器判断当前所述群组中,是否有其它终端正在通话， 如果没有， 则通 知基站为发起所述呼叫的终端建立反向业务信道； 如果有， 则集群服务器判 新发起所述呼叫的终端的优先级是否高于正在通话的终端的优先级，如果发 起所述呼叫的终端的优先级高，则通知基站强制拆除当前正在通话的用户的 反向业务信道， 为优先级高的终端建立反向业务信道； 如果发起所述呼叫的 终端的优先级低， 则保持当前的通话状态。
所述公用长码掩码包括两种类型：非全群组呼叫的长码掩码和全群组呼 叫的长码掩码；所述非全群组呼叫的长码掩码用于被呼叫终端是群组的部分 终端时的集群呼叫，所述全群組呼叫的长码掩码用于被呼叫终端是群组的全 部终端时的集群呼叫。 本发明通过在同一小区内采用公用前向业务信道的方法，使一个集群群 组在一个小区内可以仅使用一个前向信道，一个集群群组仅使用一个反向业 务信道， 使得原来受限于小区内用户数的数字集群系统， 变成单个群组用户 数不受限的系统， 极大地提高了集群通信的系统容量， 降低了集群通讯的系 统拥塞概率， 从根本上解决了数字集群系统小区容量限制的问题。
附图说明
图 1是采用本发明集群通讯方法的系统结构图；
图 2是本发明集群通讯方法的流程图；
图 3是本发明方法中公用长码掩码的示意图；
图 4是本发明方法中反向业务信道调度的流程图。
具体实施方式
下面结合附图和实施例， 对本发明作进一步的详细描述。
本发明集群通讯方法可用于如图 1所示的系统， 包括基站系统、 必要的 核心网设备和集群服务器，基站系统包括至少 1个基站收发信机和 1个基站 控制器， 其中核心网设备可直接采用 )ΜΑ200 ()通讯系统的设备， 对于基站 收发信机和基站控制器， 则需要增加相应的集群控制功能， 如对集群呼叫的 业务选项的处理等， 终端是集群用户。 一个集群可以包含多个群组， 一个群 组的用户可以位于多个小区中，一个群组在一个小区中可以包括一个以上的 集群用户。
图 2是本发明集群通讯方法的流程图。图 1中的终端 Α通过反向控制信 道发起集群呼叫请求， 该呼叫请求中包含有被呼叫群组终端的信息， 集群服 务器可根据此信息确定向哪些群组终端发送哪一种公用长码掩码。基站系统 根据业务选项判定为集群呼叫， 将启呼消息发给集群服务器。 集群服务器收 到启呼消息后， 查找终端 A呼叫的群组终端及其位置信息， 并将终端 A呼叫 的群組终端的位置信息通知基站，基站为这些群组终端所在的每个小区建立 一条公用前向业务信道， 图 1中的圆圈和多个指向圆圏的箭头表示在一个小 区下建立一条公用前向业务信道， 向整个小区发送。 同时， 集群服务器根据 呼叫请求， 判断群組的公用长码掩码是否已经约定， 即终端申请服务时是否 已登记确定的序列号作为群组的公用长码掩码， 如果已经约定， 则通知基站 使用该公用长码掩码；如果没有约定，则集群服务器构造一个公用长码掩码， 通知基站， 并通过空中消息把该公用长码掩码通知相应的群组终端。 集群服 务器通过基站为有话语权的终端分配反向业务信道。 在本实施例中， 终端 A 具有话语权。 因此由终端 A使用反向业务信道进行通话， 其他终端使用群组 的公用长码掩码解调其所在小区的前向业务信道， 完成由终端 A讲话， 其他 终端接听的群组呼叫过程，其他终端不限于本基站收发信机下的群組终端设 备。 如果其它终端申请通话， 则将通话请求通过反向控制信道发送给基站， 基站根据相关信息决定是否将群组使用的反向业务信道分配给该终端。
为了在同一小区下的一个群组可以使用公用前向业务信道，则需对群组 终端提供群组的公用长码掩码， 用于同一群组在呼叫过程中使用。 在 CDMA2000 的物理层规定了长码掩码的构造方式， 但该种长码掩码都与单个 终端的电子序列号 ESN直接相关，而在本发明中，需要群组的公用长码掩码， 因此不能使用原来的长码掩码， 需重新构造群组的公用长码掩码。
图 3是本发明前向业务信道的公用长码掩码的一个实施例示意图，其中 101 代表是 CDMA2000 物理层规定的长码掩码， 前 10 位 （41-32 ) 固定为 1100011000 ,后 32位（ 31- 0 )根据终端的 ESN进行构造，一般为乱序的 ESN, 以便区分不同的终端。 102和 103可作为本发明集群呼叫共享前向信道所需 的长码掩码。
本发明提出的长码掩码的结构为： 长码掩码共 42位， 高 10位（41-32 ) 用于标识该呼叫为群组呼叫； 低 32位（ 31-0 ) 则分为等长的两部分： 前 16 位 （ 31-16 )作为集群的群组标记 （Trucking Group ID , 简称 TGID ) , 后 16位 ( 15- 0 )有两种情况： 一是作为群组中的用户标记 ( Trucking User ID, 简称 TUID ) , 用于群组中的非全群组呼叫， 最大数连续 16个 1作为保留位， 如图 3中的 102; 二是固定为 16个 1 , 用于组呼中的全群组呼叫， 如图 3中 的 103。 集群服务器根据集群呼叫消息中被呼叫群组终端的信息， 确定发送 哪一种公用长码掩码。对于前 10位，可固定为 Q011100111 ,刚好是 CDMA2000 物理层标准中规定的单个终端掩码的按位取反；也可以采用任意一个与普通 呼叫标识相区别的序列。
为在节约前向信道资源的同时， 节省反向信道资源， 对于反向业务信道 的建立采用终端调度的方式实现， 与公用前向信道一起完成群组呼叫功能， 图 4是反向业务信道调度的流程图。 '
当移动终端开机后， 经过一定的指派流程进入空闲状态 （步驟 401 ) , 这样可加快集群呼叫的启呼速度， 满足集群呼叫极短的启呼时间要求。 基站 或核心网检测空闲定时器是否超时（步驟 402 ) , 以避免出现集群已经停止 呼叫而仍然占用相关资源的情况，如果已超时，则群组终端恢复空闲状态（步 驟 410 ) ; 如果没有超时， 则基站检测反向控制信道， 判断是否有新的集群 呼叫 （步驟 403 ) 。 如果没有新的集群呼叫， 则返回步驟 402; 如果有新的 集群呼叫， 则基站或核心网设备复位空闲定时器 （步驟 404 ) , 并将启呼消 息发给集群服务器。 集群服务器判断该呼叫是否为群组中的第一个呼叫， 如 果是， 则通知基站为该终端建立反向业务信道， 群组进入激活状态， 并使用 公用前向业务信道完成一次群組呼叫（步驟 409 )，呼叫结束后返回步骤 402 ; 如果否， 则集群服务器判断群組中是否有其他终端正在通话， 如果没有， 则 通知基站为该终端建立反向业务信道， 群组进入激活状态， 并使用公用前向 业务信道完成一次群组呼叫 （步骤 409 ) , 呼叫结束后返回步驟 402。 如果 此时群组中有其它终端正在通话，则集群服务器判断新申请呼叫的群组终端 的优先级是否比正在通话的终端的优先級高 （步骤 407 ) , 如果高， 则通知 基站强制拆除当前正在通话的终端的反向业务信道，为优先级更高的终端建 立反向业务信道（步骤 408 ) , 完成一次呼叫， 呼叫结束后， 返回步驟 402。 如果新申请呼叫的群组终端的优先级低， 则保持当前通话， 等呼叫结束后返 回步骤 402。
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

权利要求书
1、 一种集群通讯方法， 应用于 CDMA2000 移动通讯系统， 所述通讯系 统包括由至少一个基站收发信机和一个基站控制器构成的基站系统、核心网 设备和集群服务器， 所述基站收发信机和基站控制器具有集群控制功能； 其 特征在于， 所述集群通讯方法包括：
终端发起集群呼叫请求， 基站将呼叫请求发给集群服务器； 集群服务器 查找所述终端呼叫的群组终端及其位置信息，并将所述终端呼叫的群组终端 的小区位置信息通知基站；基站为所述群组终端位于的每个小区分配一个公 用前向业务信道； 集群服务器将群组的公用长码掩码通知基站和 /或所述群 组终端； 集群服务器通过基站为有话语权的终端分配一个反向业务信道； 所 述群组终端使用公用长码掩码监听所述公用前向业务信道。
2、 根据权利要求 1所述的集群通讯方法， 其特征在于， 所述集群服务 器将群组的公用长码掩码通知基站和 /或所述群组终端的步骤包括： 集群服 务器判断判断群组的公用长码掩码是否已经约定，即终端申请服务时是否已 登记确定的序列号作为群组的公用长码掩码， 如果已经约定， 则通知基站使 用该公用长码掩码； 如果没有约定， 则集群服务器构造一个公用长码掩码， 通知基站， 并通过空中消息把该公用长码掩码通知相应的群组终端。
3、 根据权利要求 1所述的集群通讯方法， 其特征在于， 所述集群服务 器通过基站为有话语权的终端分配一个反向业务信道步驟进一步包括：集群 服务器判断所述集群呼叫是否是所述群组的第一个呼叫， 如果是， 则通知基 站为有话语权的终端建立反向业务信道； 如果否， 则集群服务器判断当前所 述群组中是否有其它终端正在通话， 如果没有， 则通知基站为发起所述呼叫 的终端建立反向业务信道； 如果有， 则集群服务器判断发起所述呼叫的终端 的优先级是否高于正在通话的终端的优先级，如果发起所述呼叫的终端的优 先级高， 则通知基站强制拆除当前正在通话的用户的反向业务信道， 为优先 级高的终端建立反向业务信道； 如果发起所述呼叫的终端的优先级低， 则保 持当前的通话状态。
4、 根据权利要求 1、 2或 3所述的集群通讯方法， 其特征在于， 所述 公用长码掩码包括两种类型： 非全群组呼叫的长码掩码和全群组呼叫的长码 掩码；所述非全群组呼叫的长码掩码用于被呼叫终端是群组的部分终端时的 集群呼叫，所述全群组呼叫的长码掩码用于被呼叫终端是群组的全部终端时 的集群呼叫。
5、 根据权利要求 4所述的集群通讯方法， 其特征在于， 所述公用长码 掩码的结构为： 长码掩码共 42位， 其中高 1 0位， 即位 41至位 32 , 用于标 识该呼叫为群组呼叫； 低 32位， 即位 31至位 0 , 分为等长的两部分， 其中 高 16位， 即位 31至位 16 ,作为集群的群组标记； 低 16位， 即位 15至位 0 , 对于非全群组呼叫的长码掩码， 是作为群组中的用户标记， 最大数连续 16 个 1作为保留位； 对于全群组呼叫的长码掩码， 则固定为 16个 1。
6、 根据权利要求 5所述的集群通讯方法， 其特征在于， 所述群组呼叫 标识选用 00111 00111。
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CN100551096C (zh) * 2004-12-29 2009-10-14 中兴通讯股份有限公司 Cdma集群通信系统中发送反向信令的方法
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