WO2009021373A1

WO2009021373A1 - Implement method of voice forward in digital cluster system

Info

Publication number: WO2009021373A1
Application number: PCT/CN2007/003652
Authority: WO
Inventors: Yanjuan Gu; Haojie Zhai; Fang Wang; Jinlei Zhu
Original assignee: Zte Corporation
Priority date: 2007-08-16
Filing date: 2007-12-18
Publication date: 2009-02-19
Also published as: CN101111010B; CN101111010A

Abstract

An implement method of voice forward in a digital cluster system, including: when a cluster user originates a call, establishing a voice link and sending the voice to a PDS, namely a cluster dispatch server, through a uplink pass thereof; when the different cluster users are in the same link, the PDS forwards the voice to the users through a downlink pass of the voice link, according to the voice link identification carried by the voice flows; when the cluster users aren't in the same link, the PDS forwards the user's voice through the downlink pass after transferring the protocol between the different voice links, according to the voice link identification carried by the voice flows.

Description

Method for realizing voice forwarding in digital trunking system

Technical field

The present invention relates to the field of mobile communications, and in particular, to a method for implementing voice forwarding in a digital trunking system.

Background technique

The trunking communication system is a multi-purpose, high-efficiency wireless dispatch communication system that shares resources, shares costs, and shares channel devices and services. It provides one-to-one or one-to-many fast voice connections between group users, providing a half-duplex way of working, allowing a large number of users (talking groups) to share relatively few communication links, managed by the system The sharing problem of communication links, channel selection and allocation are transparent to the user.

Unlike traditional voice services, which are mostly one-to-one communication, cluster services can implement one-to-many voice connections. When a one-to-many cluster service is used, a group of users can be pre-defined to initiate a call. After a group is successfully established, the voice information of the currently speaking user of the system will be forwarded to ensure that other users in the cluster call can make a call.

However, in the current digital trunking system, when voice forwarding is implemented in the cluster, the voice links are not separately designed, which wastes system resources, and P contends for transmission efficiency. At the same time, the voice link adopts a single protocol, which limits the scope of application. The voice data on the communication shared link is mixed, which affects the call quality and efficiency.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method for implementing voice forwarding in a digital trunking system, which solves the problem of serious waste of system resources, low transmission efficiency, limited application range, and low call quality in the prior art.

The main features of the technical solution of the present invention are:

When a cluster user initiates a call, a voice link is established and voice is sent to the PDS, that is, the cluster scheduling server through the uplink channel; When the users of different clusters are on the same link, the PDS forwards the voice to the user through the downlink channel of the voice link according to the voice link identifier carried in the voice stream.

When the cluster users are not on the same link, the PDS forwards the user voice through the downlink channel of the voice link according to the voice link identifier carried in the voice stream and through the protocol conversion between different voice links.

Further, in the present invention, the non-roaming user initiates a call and performs voice forwarding, including the following steps:

Step 1: The non-roaming user initiates a call and establishes a voice link.

Step 2: The non-roaming user sends a speech request to the PDS, and the PDS performs the right arbitration process. If the arbitration is successful, the PDS sends the call right grant signaling to the user, and performs step 3, otherwise, the user request fails, and the process ends;

Step 3: The non-roaming user sends the speech voice to the PDS through the uplink channel of the voice link. Step 4: The PDS performs voice over the downlink channel of the voice link according to the voice link identifier and the group connection entry carried in the voice stream. Forward.

Further, in the present invention, the roaming user initiates a call and performs voice forwarding, including the following steps:

Step 1: The roaming user initiates a call request to the roaming PDS, and the roaming PDS forwards the call to the home PDS;

Step 2: The home PDS performs the right arbitration process. If the arbitration is successful, the home PDS sends the voice authorization signaling to the roaming PDS, and the roaming PDS receives the call authorization and forwards it to the roaming user. Step 3: The roaming user will Speech speech is sent to the roaming area through the uplink channel of the voice link

PDS;

Step 4: The roaming PDS performs voice forwarding through the downlink channel of the voice link according to the voice link identifier and the group connection entry carried in the voice stream. Meanwhile, the roaming PDS passes the uplink channel of the voice link to the home PDS. Forwarding roaming user voice streams;

Step 5: The home PDS performs voice forwarding on the downlink channel of the voice link according to the voice link identifier and the group connection entry carried in the voice stream. Further, the foregoing method has the following features: When a cluster user initiates a call, establishing a voice link means: The PDS establishes a voice link and stores all information of the voice link in a system group connection table of the PDS.

Further, the foregoing method has the following features: The voice link information stored in the system group connection table of the PDS includes: link attribute, link status, and forwarding attribute.

Further, the foregoing method has the following features: The voice link established by the PDS includes three types:

The PDS and the PDC are voice links between the cluster scheduling clients, and are used by the PDS to forward voices to the base station subsystem and the terminal subsystem;

The PDS and DAC are the voice links between the console clients, and are used by the PDS to forward voice to the DAC;

A voice link between the PDS and the PDS for forwarding voice between the home PDS and the roaming PDS.

Further, the foregoing method has the following features: The mobile terminal under the same PDC shares a voice link, and the voice link is bidirectional, and includes an uplink channel and a downlink channel; the uplink channel is responsible for sending a voice stream to the PDS. The downlink channel is responsible for accepting the voice stream delivered by the PDS; the voice stream sent to the PDS and the voice stream delivered by the PDS are implemented by the PDC.

Further, the above method has the following features: The voice link is implemented by using multiple protocols and the PDS completes the conversion of protocols of various voice links.

The invention realizes that the speech stream of the speech in the trunk call is forwarded to all members in the group, and that each member in the group can hear the speech of the speaker. At the same time, the voice link adopts a separately designed method, which saves system resources and improves transmission efficiency. At the same time, the voice link can be implemented by using multiple protocols, the application scope is greatly expanded, and the voice data on the link is clear, and the call shield is improved. And efficiency. Drawing fan

1 is a network structure diagram of a digital trunking communication system to which the present invention is applied;

2 is a flow chart of realizing voice stream forwarding when a user speaks in a cluster call according to the present invention; FIG. 3 is a flow chart of voice stream forwarding when a user speaks in a non-roaming cluster call according to the present invention; 4 is a flow chart of voice stream forwarding when a roaming user speaks in a roaming trunk call according to the present invention.

Preferred embodiment of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , it is a typical digital trunking system network structure diagram corresponding to the present invention, and the components are as follows:

1. MS (Mobile Station): A terminal device with PTT (Push To Talk) trunking service function. It also has various service capabilities such as telephone interconnection service, packet data service, and short message service.

2. BTS (Base Transceiver Station): A device that transmits and receives wireless signals.

3. BSC (Base Station Controller): Completes the access function of the terminal and distributes it to the corresponding subsystem according to the type of service used by the user.

4. PDC (PTT Dispatch Client): It is the scheduling client of the cluster system. It processes the terminal reverse signaling on the reverse link and collects the PTT voice service flows, and processes them on the forward link. Forward signaling of the PDS and distribution of the FTT voice traffic.

5. PDS (PTT Dispatch Server): It is the cluster scheduling server of the cluster system. It is responsible for the establishment, release and scheduling of PTT calls, and receives PTT voice packets from the reverse link and distributes them to the forward link. All operations involved in the present invention are performed by the business module on the PDS.

6. PHR (PTT Home Register, PTT Cluster Authentication Server): Provides PTT group registration, group member registration, and completes PTT call authentication, authorization, and accounting functions.

7. DAS (Dispatching Agent Server): The DAC accesses the proxy server of the cluster system to provide rights management and proxy forwarding control for the access of the DAC client.

8. DAC (Despatching Agent Client): The operation client provided to the cluster user is divided into the dispatching station and the management station according to the different login status of the user.

The PDS is the core network element of the PTT scheduling subsystem, completes call control, user paging, For voice forwarding and other operations, a voice forwarding table (referred to as a system group connection table) of all currently active groups is also established and maintained, and each activated cluster call corresponds to a record in the voice forwarding table (referred to as a record) The group connection entry of the group), which stores all the voice link information included in the activation group, including link attributes, link status, and forwarding attributes. When forwarding the voice of the trunk call, the PDS first finds the correct group connection entry (that is, one record in the system group connection table corresponding to the activation group), and then according to all the voice link information it contains, Perform voice forwarding processing.

From the perspective of communication network elements connected by voice links, voice links can be divided into three categories:

(1) A voice link between the PDS and the PDC, used by the PDS to forward voice to the base station subsystem and the terminal subsystem;

(2) a voice link between the PDS and the DAC for the PDS to forward the voice to the dispatcher client;

(3) A voice link between the PDS and the PDS for forwarding voice between the home PDS and the roaming PDS. A group connection entry may include one or more of the above three types of voice links.

As shown in FIG. 2, a flow diagram for implementing voice forwarding based on, for example, the cluster system shown in FIG. 1 is shown, which includes the following steps:

Step 1: When the cluster user initiates a call, a voice link is established and voice is sent to the PDS, that is, the cluster scheduling server through the uplink channel;

Step 2: The PDS forwards the voice to the user through the downlink channel of the voice link according to the voice link identifier carried in the voice stream, where:

When the different cluster users are on the same link, the PDS forwards the voice to the user through the downlink channel of the voice link according to the voice link identifier carried by the voice stream.

Figure 3 and Figure 4 respectively describe in detail the processing flow of voice forwarding for roaming and non-roaming users in the cluster system. For the convenience of description, it is assumed that after the cluster call is established, member MS-1 and member MS-3 are in the same PDC-1. Next, while MS-2 is under another PDC-2. FIG. 3 is a flow chart of forwarding a voice stream when a user speaks in a non-roaming cluster call according to the present invention, and the specific steps are as follows:

Step 301: The MS-1 initiates a speech request, and the PDC-1 at the location of the MS-1 forwards the call request signaling of the MS-1 to the PDS.

Step 302: The PDS performs the right arbitration process. If the current system allows the MS-1 to speak,

The call grant signaling of MS-1 is sent back to PDC-1, and PDC-1 is forwarded to MS-1. MS-1 receives the call grant response signaling indicating that it has obtained the speaking right in the group and can start speaking;

Step 303, the terminal sends the MS-1 speech voice to the PDC-1 where it is located, and the PDC-1 forwards its voice stream to the PDS;

Step 304: After receiving the voice, the PDS finds the link information corresponding to the voice link in the PDS according to the voice link identifier carried in the voice stream of the MS-1, and then finds the group connection entry corresponding to the trunk call. The PDS first determines whether the currently received voice is the voice of the current speaker MS-1 of the group, and if not, discards the voice stream, otherwise traverses all voice links recorded in the group connection table entry table, and according to these The voice link attributes are forwarded by voice;

When traversing to the shared voice link between MS-1 and MS-3 (ie, the voice link established between PDS and PDC-1 for this trunk call), the PDS forwards the group current talker MS- to MS-3. 1 voice stream, so MS-3 can already hear the MS-1 voice; here the MS-1 voice is sent to the PDS through the uplink channel of the voice link, and the PDS passes the downlink of the voice link. The channel forwards the voice stream of the MS-1 to the MS-3;

When the PDS traverses to the voice link established between the PDS and the PDC-2 for the trunk call,

The PDS forwards the voice stream of the current speaker MS-1 of the group to the MS-2 through the downlink channel of the voice link;

When the PDS traverses to the voice link established between the PDS and the DAC for the trunk call, the PDS forwards the voice stream of the current speaker MS-1 of the group to the DAC through the downlink channel of the voice link.

In addition, considering that the voice link can be implemented by using multiple protocols, when there are multiple voice links in a cluster call, it is necessary to perform necessary voice stream conversion according to the attributes of different voice links, and in this system, Let the PDS do this conversion. For example, between PDS and PDC The voice link is encapsulated in GRE, that is, the general routing package, and the voice link between the PDS and the DAC is encapsulated in real-time protocol. In step 304, the PDS must convert the voice stream of the GRE package into RTP, and then Send to DAC.

FIG. 4 is a flow chart of forwarding a voice stream when a roaming user speaks in a roaming trunk call according to the present invention, and the specific steps are as follows:

Step 401: The MS-1 initiates a call request, and the PDC-1 at the location of the MS-1 sends the call request to the corresponding roaming PDS. Because the roaming PDS cannot perform the intra-group arbitration, the roaming PDS And forwarding the call request to the home PDS;

Step 402: The home PDS performs the right arbitration process. If the current system allows the MS-1 to talk, the home PDS sends the call authorization signaling of the MS-1 to the roaming PDS, and the roaming PDS receives the message and then forwards it to the MS- 1 The right authority authorization signaling, the MS-1 receives the right grant response signal indicating that it has obtained the speaking right in the group, and can start speaking;

Step 403: The terminal sends the MS-1 speech voice to the PDC-1 where it is located, and the PDC-1 forwards its voice stream to the roaming PDS.

Step 404: The roaming PDS finds the link information corresponding to the voice link in the roaming PDS according to the voice link identifier carried in the voice stream of the MS-1, and then finds the group connection entry corresponding to the trunk call; The PDS first determines whether the currently received voice is the voice of the current speaker MS-1 of the group, and if not, discards the voice stream, otherwise traverses all the voice links recorded in the group connection table entry table, and according to these The voice link is forwarded to the home PDS through the uplink channel of the voice link when the voice link established by the trunk call is traversed between the roaming PDS and the home PDS. The voice stream of the current speaker MS-1 of the group; when the roaming PDS traverses to the voice link established between the PDS and the PDC-1 of the roaming site for the trunk call, the roaming PDS passes the downlink of the voice link. The channel forwards the voice stream of the current speaker MS-1 of the group to the MS-3;

Step 405, the home location; after receiving the MS-1 voice stream forwarded by the PDS in the roaming place, the PDS finds the link information corresponding to the voice link in the home PDS according to the voice link identifier carried in the voice stream of the MS-1. , and then find the group connection entry corresponding to the cluster call. Attribution PDS first judge Whether the currently received voice is the voice of the current speaker MS-1 of the group, if not, discarding the voice stream, otherwise traversing all the voice links recorded in the group connection table entry table, and according to the voice links Attributes for voice forwarding; When traversing to the voice link established between the home PDS and PDC-2 for the current cluster call, the home PDS forwards the group to the MS-2 through the downlink channel of the voice link. The voice stream of the speaking party MS-1; when the home PDS traverses to the voice link established by the cluster call between the home PDS and the DAC, the home PDS forwards the group to the DAC through the downlink channel of the voice link. The voice stream of the current speaking party MS-1.

The invention realizes that the roaming user and the non-roaming user forward the speech stream to all members in the group in the cluster call, and ensure that each member in the group can hear the speech of the speaker. At the same time, the voice link adopts a separately designed method, which saves system resources and improves transmission efficiency. At the same time, the voice link can be implemented by using multiple protocols, the application scope is greatly expanded, the voice data on the link is clear, and the call quality is improved. effectiveness. Industrial applicability

The method for implementing voice forwarding in the cluster system of the present invention is applicable to the field of mobile communications, and more particularly to a digital trunking system. By applying the invention, the speech stream of the speech in the trunk call is forwarded to all members in the group, so that each member in the group can hear the speech of the speaker. At the same time, the voice link adopts a separately designed method, which saves system resources and improves transmission efficiency. At the same time, the voice link can be implemented by using multiple protocols, the application scope is greatly expanded, and the voice data on the link is clear, and the call shield is improved. And efficiency.

Claims

Claim

A method for implementing voice forwarding in a digital trunking system, characterized in that

When a cluster user initiates a call, a voice link is established and voice is sent to the PDS, that is, the cluster scheduling server through the uplink channel;

2. The method according to claim 1, wherein the non-roaming user initiates a call and performs voice forwarding, including the following steps:

Step 1: The non-roaming user initiates a call and establishes a voice link.

Step 3: The non-roaming user sends the speech voice to the PDS through the uplink channel of the voice link. Step 4: The PDS performs voice according to the voice link identifier and the group connection entry carried in the voice stream. Forward.

3. The method according to claim 1, wherein the roaming user initiates a call and performs voice forwarding, including the following steps:

Step 2: The home PDS performs the right arbitration process. If the arbitration succeeds, the home PDS sends the voice authorization signaling to the roaming PDS, and the roaming PDS receives the call authorization and forwards it to the roaming user. Step 3: The roaming user will Speech speech is sent to the roaming area through the uplink channel of the voice link

PDS; Step 4: The roaming PDS performs voice forwarding through the downlink channel of the voice link according to the voice link identifier and the group connection entry carried in the voice stream. Meanwhile, the roaming PDS passes the uplink channel of the voice link to the home PDS. Forwarding roaming user voice streams;

Step 5: The home PDS performs voice forwarding on the downlink channel of the voice link according to the voice link identifier and the group connection entry carried in the voice stream.

The method according to claim 1, wherein when the cluster user initiates a call, establishing a voice link means: the PDS establishes a voice link and stores all information of the voice link in a system group connection table of the PDS. in.

The method according to claim 4, wherein the voice link information stored in the system group connection table of the PDS includes: link attribute, link status, and forwarding attribute.

The method according to claim 1, wherein the voice link established by the PDS comprises three types: a voice link between the PDS and the PDC, that is, a cluster scheduling client, and is used for the PDS to the base station subsystem and the terminal. The system forwards the voice; the PDS and DAC are the voice links between the dispatcher clients, and the PDS forwards the voice to the DAC; the voice link between the PDS and the PDS is used to forward the voice between the home PDS and the roaming PDS. .

7. The method according to claim 6, wherein the mobile terminal under the same PDC shares a voice link, and the voice link is bidirectional, and includes an uplink channel and a downlink channel; the uplink channel is responsible for The voice stream is sent to the PDS, and the downlink channel is responsible for receiving the voice stream delivered by the PDS. The voice stream sent to the PDS and the voice stream sent by the PDS are implemented by the PDC.

8. The method of claim 7, wherein the voice link is implemented using a plurality of protocols and the PDS performs protocol conversion of the various voice links.