WO2005039208A1 - A method for trunked terminal handover while terminals at receive service state - Google Patents

A method for trunked terminal handover while terminals at receive service state Download PDF

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Publication number
WO2005039208A1
WO2005039208A1 PCT/CN2004/001146 CN2004001146W WO2005039208A1 WO 2005039208 A1 WO2005039208 A1 WO 2005039208A1 CN 2004001146 W CN2004001146 W CN 2004001146W WO 2005039208 A1 WO2005039208 A1 WO 2005039208A1
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Prior art keywords
cluster
target cell
handover
terminal
shared channel
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PCT/CN2004/001146
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French (fr)
Chinese (zh)
Inventor
Li Jiang
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Huawei Technologies Co., Ltd.
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Publication of WO2005039208A1 publication Critical patent/WO2005039208A1/en

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to the field of digital trunked communication, and in particular, to a method for switching a trunk terminal in a digital cellular trunked communication system in a receiving service state.
  • the trunking communication system is an advanced mobile dispatching system. It is a more economical and flexible command dispatching communication system developed in recent years. It is widely used in government agencies, energy transportation, airport terminals, industrial and mining enterprises, fire and police, and water conservancy. And the military and other units to meet the needs of internal communications between the units, representing the development direction of dedicated mobile communication networks.
  • the digital cellular network cluster communication system can enable multiple cluster users to share wireless resources and increase the capacity of the wireless cellular system.
  • the cluster communication system can provide a voice group call service (VGCS, Voice Group Call Service) to achieve half-double Call in industrial mode, that is, when a business user or an authorized dispatcher initiates a group call, other users within the group call range can receive the group call, and only users who have applied for speaking permission in the cluster group at the same time can Speak, other users in the cluster group need to get the right to speak.
  • VGCS Voice Group Call Service
  • the trunking communication system can also provide a Voice Broadcast Service (VBS, Voice Broadcast Service) to implement a broadcast call, that is, when a business user or an authorized dispatcher initiates a group call, other users within the group call can receive the group call, and Only the initiator of the group call can speak from beginning to end, and other users in the cluster group can only receive.
  • VBS Voice Broadcast Service
  • a terminal when a terminal moves, it involves switching from a source cell to a target cell in a state of receiving a service.
  • the process is shown in FIG. 1.
  • the terminal reports the pilot signal strength A of the source cell base station and the pilot signal strength B of the target cell base station to the source cell base station.
  • the source cell base station reports the pilot signal strength to the base station controller (BSC).
  • BSC base station controller
  • the regional base station crosses the BSC, it also needs to report to the MSC for forwarding, that is, the participation of the MSC is required.
  • the said The result of comparison according to a certain method may be the difference, or ratio, or a function value obtained from them as a parameter; sending a request to the target cell base station to establish a wireless service channel for the terminal; the target cell base station is The terminal establishes a wireless service channel, and forwards the established wireless service channel information to the source cell base station through the BSC (and possibly MSC).
  • the source cell base station obtains the wireless service channel information established by the target cell base station for the terminal, it The information and the switching command are sent to the terminal, and then the terminal switches to the wireless service channel of the target cell. After the switching is completed, the wireless service channel of the source cell is removed.
  • a cluster user in a digital cellular network trunking communication system is usually also a mobile wireless terminal.
  • the trunking terminal that is in the state of receiving the service will also switch from the source cell to the destination cell when moving.
  • the base station system allocates a forward traffic channel and a reverse traffic channel to each cluster group, wherein the forward traffic channel is shared by all cluster terminals in the cluster group, which is often referred to as a forward shared channel in the cluster communication system.
  • the reverse traffic channel is preempted by the cluster terminals in the cluster group, and the above method of terminal switching in the digital cellular network communication system cannot be used for cluster terminals.
  • An object of the present invention is to provide a method for switching a cluster terminal in a receiving service state, so as to solve a problem that the cluster terminal in a receiving service state switches from a source cell to a target cell during a cluster service.
  • a method for switching a cluster terminal in a receiving service state includes the following steps.
  • the cluster terminal detects the signal strength from the source cell base station and the signal from the target cell base station. Strength, determine whether the handover trigger condition is met, if the handover trigger condition is met, determine whether the target cell supports the cluster group to which the cluster terminal belongs, and if so, listen to the forward shared channel of the cluster group broadcast by the target cell Information, directly switch from the forward shared channel of the source cell to the forward shared channel of the cluster group in the target cell. If the trigger condition for the handover is not met or is not supported, the cluster terminal stops handover.
  • the signal strength is a pilot signal strength
  • the step of determining whether a handover trigger condition is satisfied includes determining whether a pilot signal from a target cell base station is stronger than a pilot signal from a source cell base station, and comparing the results. Whether to reach a threshold.
  • the step of determining whether the target cell supports the cluster group to which the cluster terminal belongs includes: the cluster terminal monitors the cluster group group number broadcasted by the target cell, and determines whether the monitored cluster group group number and the cluster to which the cluster terminal belongs belong.
  • the cluster group numbers of the groups are the same.
  • the present invention allows the cluster terminal in the state of receiving the service to use the signal strength from the source cell base station and the signal strength from the target cell base station according to the characteristics of the cluster service. Trigger a handover, and switch directly from the forward shared channel of the source cell to the forward shared channel of the target group by monitoring the forward shared channel information of the cluster group to which the cluster terminal belongs that the target cell broadcasts.
  • the handover process there is no need for signaling interaction between network-side devices, and no need for the base station to re-establish the wireless service channel, which saves the system's wireless resources and simplifies the handover process of the cluster terminal in the state of receiving services.
  • FIG. 1 is a process of handover from a source cell to a target cell in a state of receiving a service when a terminal of a digital cellular network communication system moves in the prior art.
  • FIG. 2 shows a process in which a trunking terminal in a receiving service state of the present invention switches from a source cell to a target cell.
  • the base station system within the group call range is based on the mobile switching center (MSC) or the access location register (VLR) or the group call.
  • MSC mobile switching center
  • VLR access location register
  • the service area information contracted by the cluster group establishes a forward shared channel, and broadcasts the group number of the current group call and the forward shared channel information of the cluster group through the paging channel.
  • the directional shared channel information includes the frequency band of the forward shared channel, demodulation parameters, and the like.
  • the base station separately establishes a forward shared channel for each cluster group in the cell.
  • the information of the forward shared channel of each cluster group is all Broadcast via paging channel.
  • FIG. 2 shows a process in which the cluster terminal in the receiving service state of the present invention switches from a source cell to a target cell.
  • the cluster terminal moves from the source cell to the target cell, and the cluster terminal detects that the pilot signal strength A from the source cell is less than a certain threshold of the pilot signal strength B from the target cell, the cluster terminal monitors the target cell base station for paging The group number of the current group call of the channel broadcast and the forward shared channel information of the cluster group.
  • the cluster group number of the target cell broadcast and the cluster group number of the cluster group to which the cluster terminal belongs are the same, Obtain the forward shared channel information of the cluster group in the target cell by monitoring, and directly switch from the forward shared channel of the source cell to the forward shared channel of the target cell.
  • the above source cell and target cell can belong to the same BSC, or can belong to different BSCs under the same MSC, or can belong to different MSCs. When they belong to different BSCs or different MSCs, the handover can be performed directly without the participation of MSC or BSC.
  • the forward shared channel of the source cell is switched to the forward shared channel of the target cell.
  • the cluster terminal is a shared wireless service channel in each serving cell, it is not assigned individually for a certain cluster terminal.
  • the original forward shared channel cannot be removed.
  • the forward shared channel of the cluster group already exists in the target cell, and there is no need to create a new wireless channel.
  • the service channel can be directly switched to the existing wireless shared channel in the target cell to continue the service, so the network side, ie, the MSC or BSC, does not need to participate in the switching process.
  • the cluster terminal will No switching is performed.
  • the cluster service whether it is a VGCS service or a VBS service
  • multiple cluster terminals in the cluster group receive the initiator group call at the same time.
  • the application The method provided by the present invention not only does not require the participation of the network side during the handover, but also does not require the base station of the target cell to re-establish the wireless service channel for the trunk terminal, which saves the wireless resources of the system and improves the handover speed.

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

Abstract

The present invention disclosed a method for trunked terminal handover while terminals at receive service state, this method comprise: detect signal intensity from BS of source cell and target cell by trunked terminal which at receive service state, and determine whether handover start condition is satisfied. If satisfied the handover start condition, determine whether target cell is support trunked group which the trunked terminal belong to. If it is support, monitor forward shared channel information of the trunked terminal broadcasted by target cell, and directly handover from forward shared channel of source cell to forward shared channel of target cell trunked terminal. If it is not satisfied or support, trunked terminal end handover, and still using forward shared channel of source cell. During the handover not need switch signaling between equipment of network side, and not need BS restablish wireless service channel. The present invention save wireless resource of system, and simply handover procedure of trunked terminal at receive service state.

Description

处于接收业务状态的集群终端切换的方法  Method for switching cluster terminal in receiving service state
技术领域 Technical field
本发明涉及数字集群通信领域， 具体地说， 涉及数字蜂窝集群通信 系统中处于接收业务状态的集群终端切换的方法。 发明背景  The present invention relates to the field of digital trunked communication, and in particular, to a method for switching a trunk terminal in a digital cellular trunked communication system in a receiving service state. Background of the invention
集群通信系统是一种高级移动调度系统， 是近几年来发展起来的一 种较经济、 较灵活的指挥调度通信系统， 广泛应用在政府机关、 能源交 通、 机场码头、 工矿企业、 消防警察、 水利和军事等单位， 以满足各单 位内部通信联络的需要， 代表着专用移动通信网发展方向。  The trunking communication system is an advanced mobile dispatching system. It is a more economical and flexible command dispatching communication system developed in recent years. It is widely used in government agencies, energy transportation, airport terminals, industrial and mining enterprises, fire and police, and water conservancy. And the military and other units to meet the needs of internal communications between the units, representing the development direction of dedicated mobile communication networks.
数字蜂窝网集群通信系统一方面可以使多个集群用户共享无线资 源， 提高无线蜂窝系统的容量， 另一方面， 集群通信系统可提供语音组 呼业务（ VGCS, Voice Group Call Service )， 实现半双工模式的呼叫， 即， 业务用户或授权的调度员发起组呼时， 在组呼范围内的其他用户均可接 收组呼， 并且在同一时间内集群组内只有申请到讲话权限的用户可以讲 话， 集群组内其他用户讲话时需取得发言权。 集群通信系统还可提供语 音广播业务（ VBS， Voice Broadcast Service )，实现广播呼叫， 即， 业务用 户或授权的调度员发起组呼时， 在组呼范围内的其他用户均可接收组 呼， 并且自始至终只有组呼的发起者可以讲话， 集群组内其他用户只能 接收。  The digital cellular network cluster communication system can enable multiple cluster users to share wireless resources and increase the capacity of the wireless cellular system. On the other hand, the cluster communication system can provide a voice group call service (VGCS, Voice Group Call Service) to achieve half-double Call in industrial mode, that is, when a business user or an authorized dispatcher initiates a group call, other users within the group call range can receive the group call, and only users who have applied for speaking permission in the cluster group at the same time can Speak, other users in the cluster group need to get the right to speak. The trunking communication system can also provide a Voice Broadcast Service (VBS, Voice Broadcast Service) to implement a broadcast call, that is, when a business user or an authorized dispatcher initiates a group call, other users within the group call can receive the group call, and Only the initiator of the group call can speak from beginning to end, and other users in the cluster group can only receive.
在数字蜂窝网通信系统中， 终端移动时涉及在接收业务的状态下从 源小区切换到目标小区， 其过程如图 1所示。 终端向源小区基站上报源 小区基站的导频信号强度 A和目标小区基站的导频信号强度 B, 源小区 基站将导频信号强度上报给基站控制器（ BSC )，在源小区基站和目标小 区基站跨 BSC时还需要上报给 MSC转发，即需要 MSC的参与，当 BSC 检测到导频信号强度 B大于导频信号强度 A且根据某种方法进行比较的 结果达到某一阈值时， 所述根据某种方法进行比较的结果可以是它们两 者的差值、 或比值、 或由它们为参数而获得的一函数值； 向目标小区基 站发送为该终端建立无线业务信道请求； 目标小区基站为该终端建立无 线业务信道， 并将建立的无线业务信道信息通过 BSC (可能还有 MSC) 转发发送给源小区基站， 源小区基站获得目标小区基站为该终端建立的 无线业务信道信息后， 将该信息和切换命令发送给终端， 然后终端切换 到目标小区的无线业务信道，切换完成后，拆除源小区的无线业务信道。 In a digital cellular network communication system, when a terminal moves, it involves switching from a source cell to a target cell in a state of receiving a service. The process is shown in FIG. 1. The terminal reports the pilot signal strength A of the source cell base station and the pilot signal strength B of the target cell base station to the source cell base station. The source cell base station reports the pilot signal strength to the base station controller (BSC). When the regional base station crosses the BSC, it also needs to report to the MSC for forwarding, that is, the participation of the MSC is required. When the BSC detects that the pilot signal strength B is greater than the pilot signal strength A and the comparison result according to a certain method reaches a certain threshold, the said The result of comparison according to a certain method may be the difference, or ratio, or a function value obtained from them as a parameter; sending a request to the target cell base station to establish a wireless service channel for the terminal; the target cell base station is The terminal establishes a wireless service channel, and forwards the established wireless service channel information to the source cell base station through the BSC (and possibly MSC). After the source cell base station obtains the wireless service channel information established by the target cell base station for the terminal, it The information and the switching command are sent to the terminal, and then the terminal switches to the wireless service channel of the target cell. After the switching is completed, the wireless service channel of the source cell is removed.
数字蜂窝网集群通信系统中的集群用户通常也是移动无线终端， 在 业务的进行的过程中， 处于接收业务状态的集群终端移动时也会从源小 区切换到目的小区， 由于在数字蜂窝网集群通信系统中， 基站系统为每 个集群组分配一个前向业务信道和一个反向业务信道， 其中， 前向业务 信道被集群组内所有集群终端共享， 集群通信系统中常称为前向共享信 道， 反向业务信道被集群组内的集群终端抢占， 上述数字蜂窝网通信系 统中终端切换的方法无法使用于集群终端。 发明内容  A cluster user in a digital cellular network trunking communication system is usually also a mobile wireless terminal. During the process of the service, the trunking terminal that is in the state of receiving the service will also switch from the source cell to the destination cell when moving. In the system, the base station system allocates a forward traffic channel and a reverse traffic channel to each cluster group, wherein the forward traffic channel is shared by all cluster terminals in the cluster group, which is often referred to as a forward shared channel in the cluster communication system. The reverse traffic channel is preempted by the cluster terminals in the cluster group, and the above method of terminal switching in the digital cellular network communication system cannot be used for cluster terminals. Summary of the invention
本发明的目的在于提供一种处于接收业务状态的集群终端切换的方 法， 以解决在集群业务过程中处于接收业务状态的集群终端从源小区切 换到目标小区的问题。  An object of the present invention is to provide a method for switching a cluster terminal in a receiving service state, so as to solve a problem that the cluster terminal in a receiving service state switches from a source cell to a target cell during a cluster service.
本发明通过以下技术方案来实现：  The present invention is achieved through the following technical solutions:
一种处于接收业务状态的集群终端切换的方法， 该方法包括以下步 骤，  A method for switching a cluster terminal in a receiving service state. The method includes the following steps.
集群终端检测来自源小区基站的信号强度和来自目标小区基站的信 号强度， 判断是否满足切换触发条件， 如果满足切换触发条件， 则判断 目标小区是否支持该集群终端所归属的集群组， 如果支持， 则监听目标 小区广播的该集群组的前向共享信道信息， 直接从源小区的前向共享信 道切换至目标小区该集群組的前向共享信道， 如果不满足切换触发条件 或不支持， 则集群终端停止切换。 The cluster terminal detects the signal strength from the source cell base station and the signal from the target cell base station. Strength, determine whether the handover trigger condition is met, if the handover trigger condition is met, determine whether the target cell supports the cluster group to which the cluster terminal belongs, and if so, listen to the forward shared channel of the cluster group broadcast by the target cell Information, directly switch from the forward shared channel of the source cell to the forward shared channel of the cluster group in the target cell. If the trigger condition for the handover is not met or is not supported, the cluster terminal stops handover.
其中， 所述信号强度为导频信号强度， 所述判断是否满足切换触发 条件的步骤包括， 判断来自目标小区基站的导频信号是否强于来自源小 区基站的导频信号， 且进行比较的结果是否达到一阈值。  The signal strength is a pilot signal strength, and the step of determining whether a handover trigger condition is satisfied includes determining whether a pilot signal from a target cell base station is stronger than a pilot signal from a source cell base station, and comparing the results. Whether to reach a threshold.
所述判断目标小区是否支持集群终端所归属的集群组的步骤包括， 集群终端监听目标小区广播的集群组组号， 判断监听到的集群组组号是 否和该集群终端所归属的集群组的集群组号一致。  The step of determining whether the target cell supports the cluster group to which the cluster terminal belongs includes: the cluster terminal monitors the cluster group group number broadcasted by the target cell, and determines whether the monitored cluster group group number and the cluster to which the cluster terminal belongs belong. The cluster group numbers of the groups are the same.
相对于现有技术数字蜂窝网通信系统中终端切换方法而言， 本发明 根据集群业务的特点， 让处于接收业务状态的集群终端根据来自源小区 基站的信号强度和来自目标小区基站的信号强度来触发切换， 并通过监 听目标小区广播的集群终端所归属的集群组的前向共享信道信息， 直接 从源小区的前向共享信道切换至目标小区该集群组的前向共享信道， 在 整个切换过程中无需网络侧设备间信令的交互， 并无需基站重新建立无 线业务信道， 节省了系统的无线资源， 简化了处于接收业务状态的集群 终端切换过程。 附图简要说明  Compared with the terminal switching method in the prior art digital cellular network communication system, the present invention allows the cluster terminal in the state of receiving the service to use the signal strength from the source cell base station and the signal strength from the target cell base station according to the characteristics of the cluster service. Trigger a handover, and switch directly from the forward shared channel of the source cell to the forward shared channel of the target group by monitoring the forward shared channel information of the cluster group to which the cluster terminal belongs that the target cell broadcasts. During the handover process, there is no need for signaling interaction between network-side devices, and no need for the base station to re-establish the wireless service channel, which saves the system's wireless resources and simplifies the handover process of the cluster terminal in the state of receiving services. Brief description of the drawings
图 1为现有技术中， 数字蜂窝网通信系统终端移动时在接收业务的 状态下从源小区切换到目标小区的过程。  FIG. 1 is a process of handover from a source cell to a target cell in a state of receiving a service when a terminal of a digital cellular network communication system moves in the prior art.
图 2示出了本发明处于接收业务状态的集群终端从源小区切换到目 标小区的过程。 实施本发明的方式 FIG. 2 shows a process in which a trunking terminal in a receiving service state of the present invention switches from a source cell to a target cell. Mode of Carrying Out the Invention
下面结合附图对本发明进行详细描述。  The present invention is described in detail below with reference to the drawings.
当某集群组内有权限的集群终端或调度员发起该集群组的 VGCS业 务或 VBS 业务， 组呼范围内的基站系统根据移动交换中心 （MSC )或 访问位置寄存器 （VLR )或组呼寄存器 (GCR， Group Call Register)中该 集群组签约的服务区信息建立前向共享信道， 并通过寻呼信道广播当前 组呼的组号和该集群组的前向共享信道信息， 其中前向共享信道信息包 括前向共享信道的频段， 解调参数等。 在基站覆盖的同一小区下， 可能 同时存在多个集群组进行组呼， 基站为该小区下的每个集群组分别建立 前向共享信道， 各集群组的前向共享信道的信息均通过寻呼信道广播。  When a cluster terminal or dispatcher with authority in a cluster group initiates the VGCS service or VBS service of the cluster group, the base station system within the group call range is based on the mobile switching center (MSC) or the access location register (VLR) or the group call. In the register (GCR, Group Call Register), the service area information contracted by the cluster group establishes a forward shared channel, and broadcasts the group number of the current group call and the forward shared channel information of the cluster group through the paging channel. The directional shared channel information includes the frequency band of the forward shared channel, demodulation parameters, and the like. In the same cell covered by the base station, there may be multiple cluster groups for group call at the same time. The base station separately establishes a forward shared channel for each cluster group in the cell. The information of the forward shared channel of each cluster group is all Broadcast via paging channel.
如图 2所示， 图 2示出了本发明处于接收业务状态的集群终端从源 小区切换到目标小区的过程。 当集群终端发生移动从源小区进入目标小 区，集群终端检测到来自源小区的导频信号强度 A小于来自目标小区的 导频信号强度 B某一阔值时， 集群终端监听目标小区基站在寻呼信道广 播的当前组呼的组号和该集群组的前向共享信道信息， 如果目标小区广 播的集群组组号和该集群终端所归属的集群组的集群组号一致， 则通过 监听获得目标小区该集群组的前向共享信道信息， 直接从源小区的前向 共享信道切换至目标小区的前向共享信道。 上述源小区和目标小区可以 属于同一个 BSC, 也可属于同一个 MSC下的不同 BSC, 也可属于不同 的 MSC，在属于不同 BSC或不同的 MSC时切换都不需 MSC或 BSC参 与而直接从源小区的前向共享信道切换至目标小区的前向共享信道。  As shown in FIG. 2, FIG. 2 shows a process in which the cluster terminal in the receiving service state of the present invention switches from a source cell to a target cell. When the cluster terminal moves from the source cell to the target cell, and the cluster terminal detects that the pilot signal strength A from the source cell is less than a certain threshold of the pilot signal strength B from the target cell, the cluster terminal monitors the target cell base station for paging The group number of the current group call of the channel broadcast and the forward shared channel information of the cluster group. If the cluster group number of the target cell broadcast and the cluster group number of the cluster group to which the cluster terminal belongs are the same, Obtain the forward shared channel information of the cluster group in the target cell by monitoring, and directly switch from the forward shared channel of the source cell to the forward shared channel of the target cell. The above source cell and target cell can belong to the same BSC, or can belong to different BSCs under the same MSC, or can belong to different MSCs. When they belong to different BSCs or different MSCs, the handover can be performed directly without the participation of MSC or BSC. The forward shared channel of the source cell is switched to the forward shared channel of the target cell.
由于集群终端在各服务小区内都是共享无线业务信道， 并非针对某 个集群终端单独指配， 当集群组中的某些集群终端切换出源小区后， 原 来的前向共享信道仍然不能拆除， 此时可能还有其他集群终端在用该共 享信道， 同样， 目标小区内已有该集群组前向共享信道， 无需新建无线 业务信道， 可以直接切换到目标小区内已有的无线共享信道继续业务， 所以在切换的过程中不需网络侧即 MSC或 BSC参与。 当然， 如果目标 小区不支持该集群组的集群业务， 即， 当集群终端监听目标小区广播的 集群组组号和该集群终端所归属的集群组的集群组号不一致， 集群终端 将不进行切换。 Because the cluster terminal is a shared wireless service channel in each serving cell, it is not assigned individually for a certain cluster terminal. When some cluster terminals in the cluster group switch out of the source cell, the original forward shared channel cannot be removed. At this time, there may be other cluster terminals using the shared channel. Similarly, the forward shared channel of the cluster group already exists in the target cell, and there is no need to create a new wireless channel. The service channel can be directly switched to the existing wireless shared channel in the target cell to continue the service, so the network side, ie, the MSC or BSC, does not need to participate in the switching process. Of course, if the target cell does not support the cluster service of the cluster group, that is, when the cluster terminal number of the cluster terminal listening to the broadcast of the target cell is different from the cluster group number of the cluster group to which the cluster terminal belongs, the cluster terminal will No switching is performed.
在集群业务中， 无论是 VGCS业务， 还是 VBS业务， 都具有集群 组多个集群终端同时接收发起者组呼的特点， 这些处于接收业务状态的 集群终端从源小区切换到目标小区时， 应用本发明所提供的方法， 切换 时不仅无需网络侧的参与， 而且目标小区基站无需为集群终端重新建立 无线业务信道， 节省了系统的无线资源， 提高了切换的速度。  In the cluster service, whether it is a VGCS service or a VBS service, multiple cluster terminals in the cluster group receive the initiator group call at the same time. When these cluster terminals in the receiving service state are switched from the source cell to the target cell, the application The method provided by the present invention not only does not require the participation of the network side during the handover, but also does not require the base station of the target cell to re-establish the wireless service channel for the trunk terminal, which saves the wireless resources of the system and improves the handover speed.

Claims

权利要求书 Claim
1、 一种处于接收业务状态的集群终端切换的方法， 其特征在于， 该方法包括以下步骤，  1. A method for switching a cluster terminal in a receiving service state, characterized in that the method includes the following steps,
处于接收业务状态的集群终端检测来自源小区基站的信号强度和来 自目标小区基站的信号强度， 判断是否满足切换触发条件， 如果满足切 换触发条件， 则判断目标小区是否支持该集群终端所归属的集群组， 如 果支持， 则监听目标小区广播的该集群组的前向共享信道信息， 直接从 源小区的前向共享信道切换至目标小区该集群组的前向共享信道， 如果 不满足切换触发条件或不支持， 则集群终端停止切换， 仍使用源小区的 前向共享信道。  The cluster terminal in the receiving service state detects the signal strength from the source cell base station and the signal strength from the target cell base station to determine whether the handover trigger condition is met. If the handover trigger condition is met, the target cell supports the set to which the cluster terminal belongs. Group, if supported, monitor the forward shared channel information of the cluster group broadcast by the target cell, and directly switch from the forward shared channel of the source cell to the forward shared channel of the cluster group of the target cell, if the switch is not satisfied If the trigger condition is not supported, the cluster terminal stops handover and still uses the forward shared channel of the source cell.
2、 如权利要求 1 所述的方法， 其特征在于， 所述信号强度为导 频信号强度， 所述判断是否满足切换触发条件的步骤包括， 判断来自目 标小区基站的导频信号强度是否强于来自源小区基站的导频信号强度， 且进行比较的结果是否达到一阈值。  2. The method according to claim 1, wherein the signal strength is a pilot signal strength, and the step of determining whether a handover trigger condition is satisfied comprises determining whether a pilot signal strength from a target cell base station is stronger than The pilot signal strength from the source cell base station, and whether the comparison result reaches a threshold.
3、 如权利要求 1 所述的方法， 其特征在于， 所述判断目标小区 是否支持集群终端所归属的集群组的步骤包括， 集群终端监听目标小区 广播的集群组组号， 判断监听到的集群组组号是否和该集群终端所归属 的集群组的集群组号一致。  3. The method according to claim 1, wherein the step of determining whether the target cell supports a cluster group to which the cluster terminal belongs includes: the cluster terminal monitors the cluster group group number broadcast by the target cell, and judges that Is the cluster group number of the same as the cluster group number of the cluster group to which the cluster terminal belongs.
PCT/CN2004/001146 2003-10-17 2004-10-10 A method for trunked terminal handover while terminals at receive service state WO2005039208A1 (en)

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