CN100420316C - A system and method for realizing cluster business - Google Patents

Abstract

The invention discloses a system for realizing cluster services. The system includes an HRPD system and a PTT server. The HRPD system sends a PTT service request message to the PTT server, and the PTT server executes the corresponding PTT cluster group according to the received PTT service request message. To operate, generate and send a service response message to the HRPD system. The invention also discloses a method for realizing the trunking service. In the method, the user sends a registration request message to the PTT server through the HRPD system, and the PTT server assigns a PTT trunking group to the user, and can monitor the forward traffic channel shared by the group After the user joins the group, he can send the voice information to the PTT server through the reverse traffic channel, and the PTT server sends the voice information to the forward traffic channel shared by the group. Using the system and method of the present invention, the existing HRPD system can be used to realize trunking services, reducing the cost of building a dedicated trunking communication network.

Description

A system and method for realizing cluster business

technical field

The invention relates to trunking communication technology, in particular to a system and method for realizing trunking services.

Background technique

The trunking communication system is an indispensable branch of the wireless communication system, and it is one of the development hotspots in the field of mobile communication in recent years. The meaning of the trunking communication system is: all available channels of the system can be shared by all users of the system, that is, any user in the system wants to talk to another user in the system, as long as there is an idle channel, it can be controlled in the center Under the control of the station, use the idle channel to communicate and make calls. So in a sense, the trunking communication system is a multi-channel relay (forwarding) communication system that automatically shares several channels. There is no essential difference between it and common multi-channel shared communication system. However, the trunking communication system is a dedicated mobile communication system in which multiple users share a group of radio channels and dynamically uses these channels, and is mainly used for command and dispatch communication. Therefore, the trunking communication system is a dedicated command and dispatch communication system. Moreover, the trunking communication system is an advanced mobile command and dispatch communication system, and it is a multi-purpose, high-efficiency and cheap advanced radio mobile communication system that shares resources, shares costs, and provides users with excellent services.

Push-to-talk (PTT) technology is a trunking intercom technology, and PTT service refers to real-time direct connection "point-to-point" and "point-to-multipoint" voice communication. This service uses a very simple half-duplex communication method, that is, only one person can speak at the same time, so as to facilitate group communication. The calling party can initiate a call to one person or a group of people by pressing a button without dialing and waiting. The other party picked up the phone, and the call was connected immediately, and a conversation group was quickly established. It is especially suitable for collaborative work and communication between teams, working groups, and groups.

Based on the feature of "push to talk", PTT has a higher demand for access delay than ordinary telephones. At the same time, due to its own "half-duplex" Based on the transformation of the telephone network, it was developed into a dedicated trunking network. However, the construction cost of a dedicated cluster network is relatively high. Therefore, it is hoped that the existing mature network that meets the conditions of the cluster network can be used to carry the cluster business. High Rate Packet Data (HRPD) is an ideal solution. network.

HRPD is a wireless communication system standard formulated by the 3GPP2 organization. It belongs to the category of 3G technology. According to the trend of wireless network all-IP evolution, the circuit domain part is abandoned, and only the packet domain part is reserved. Through effective Quality of Service (QoS, QoS) ) technology and advanced scheduling, support from low-speed to high-speed packet data services. Since HRPD adopts a new modulation technology on the air interface and adds methods such as data rate control, scheduling optimization and time division multiplexing, the data transmission rate on the air interface has been greatly improved. A dedicated data channel is used to support high-speed packet data services, with a maximum forward data rate of 2.4576Mbps and a reverse maximum data rate of 153.6kbps.

Figure 1 is a network structure diagram of the HRPD system. It can be seen from Figure 1 that the HRPD system includes an access terminal (AT), an access network (AN), a packet control function (PCF) device, and a packet data service node (PDSN). And Access Network Authentication Authorization Accounting Server (AN AAA).

AT is similar to the mobile station in the original 2G network. Users can access the packet data network by connecting a computer to the AT (AT acts as a modem) or directly using an AT that supports packet data services.

The AN includes the functions of the traditional base station controller (BSC) and base station (BTS). On the one hand, it connects to the AT through the air interface, and on the other hand, it connects to the packet data network through the A interface.

AN AAA, as an authentication mechanism on the access network side, is mainly used for AT authentication. Its function is similar to the home location register (HLR) in the core network of the circuit domain. The AT is authenticated through the AN AAA of the core network of the packet domain. right.

The PCF is a device that controls packets.

The PDSN is the interface module for the HRPD network to access the Internet.

The A8/A9 interface is the interface between the AN and the PCF equipment, where A8 is the signaling interface and A9 is the service interface.

The A10/A11 interface is the interface between the packet data control (PCF) device in the AN and the PDSN, where A11 is the signaling interface, and A10 is the service interface; the A12 interface is used to connect the AN and ANAAA to transmit authentication information; the A13 interface is The interface between AN and AN performs signaling interaction during inter-AN handover, and exchanges messages between AT and PDSN between source AN and target AN.

Because the HRPD system has the characteristics of independent operation, fast data transmission speed, and large capacity, it is suitable for carrying cluster services. However, the existing HRPD system does not support trunking services, but supports broadcast and multicast services. The broadcast shared channel is defined in the standard. The broadcast stream service from the upper layer can be delivered through the broadcast shared channel. All users in the current network if It can adapt to the rate of the current broadcast shared channel. When it is capable of receiving the current broadcast shared channel, it can receive the content of the broadcast channel. The broadcast channel does not need to be retransmitted, and all users who register through the broadcast stream can listen.

However, there is a large gap between broadcast and multicast services and trunking services, which cannot meet the basic functions of trunking services: on the one hand, broadcast and multicast services have no PTT function, and users can only choose to listen to the content of the current broadcast channel, and cannot preempt the broadcast channel and use; on the other hand, the trunking user needs to be able to actively establish and initiate a group call, perform simplex calls and monitor within the group, and should be able to actively release it after use. The method provided by the current standard cannot be completed; in addition, the cluster business needs to manage and schedule all cluster users, and the current system cannot be completed.

Contents of the invention

The main purpose of the present invention is to provide a system for realizing the trunking network, based on the HRPD system, to realize the trunking service.

Another main purpose of the present invention is to provide a method for realizing trunking services, so that the HRPD system can be used to realize trunking services.

The purpose of the present invention is achieved through the following technical solutions:

A system for realizing trunking services, the system includes a high-speed packet data HRPD system, and the system further includes: a push-to-talk PTT server and an access terminal; the PTT server is connected to the HRPD system through a dedicated interface for trunking services, for Set up a trunking group, allocate the front reverse traffic channel for the new trunking group, set the trunking group information including the group number of the trunking group, the channel parameters of the forward traffic channel shared by each trunking group; After the access terminal with the function sends a preemption request message containing its own identity and the group number of the applied trunking group, the access terminal is allowed to send voice information through the reverse traffic channel, and send the voice information on the forward shared channel Information, broadcast the voice information through the shared forward traffic channel corresponding to the trunk group, and the access terminals in the trunk group listen to the corresponding forward traffic channel according to the channel parameters of the forward traffic channel voice message.

The HRPD system includes an access network connected to an access terminal with a PTT function through an air interface, and the PTT server is connected to the access network through an interface dedicated to trunking services, wherein,

The PTT server is further used to authenticate the access terminal with the PTT function through the access network, and complete the registration of the access terminal, group application and release of the trunking service.

The HRPD system includes an access network connected to an access terminal with a PTT function, a packet control function PCF and a packet data service node PDSN, the access terminal is connected to the access network through an air interface, and the access network is connected to the The PCF, the PCF and the PDSN are connected through a standard A interface, and the PTT server and the PDSN are connected through a trunking service-specific interface.

The PTT server is connected with other PTT servers through an Internet router.

The PTT server is connected to other PTT servers through a dedicated link.

A method for realizing cluster services, comprising the following steps:

A, set up the cluster group by the PTT server, allocate the front reverse traffic channel for this new cluster group, and set the cluster group information in the PTT server, the cluster group information includes the group number of the cluster group, each Channel parameters of the forward traffic channel shared by the trunking group;

B. When the PTT server receives the preemption request message sent by the access terminal with the PTT function, which contains its own identity and the group number of the applied cluster group, the PTT server allows the access terminal to send voice through the reverse traffic channel The information is sent to the PTT server, and the PTT server sends the voice information to the shared channel before the PTT;

C. The PTT server broadcasts the voice information through the shared forward traffic channel corresponding to the trunk group, and the access terminals in the trunk group listen to the corresponding forward traffic channel according to the channel parameters of the forward traffic channel Voice messages on .

Step A includes:

A0. After receiving the group application request message sent by the access terminal, the PTT server judges whether the group applied by the access terminal exists. Send the channel parameters of the traffic channel to the access terminal, if it does not exist, establish a cluster group, assign the channel parameters of the shared forward traffic channel to the cluster group, and send the channel parameters to the access terminal .

The information of the cluster group also includes the identity identifiers of the access terminals authorized to join the cluster group, and the identifiers of the access terminals authorized to establish and release the cluster group.

The cluster group information also includes cluster group state information.

In step C, the voice information on the corresponding forward traffic channel is monitored by the access terminal according to the channel parameters of the forward traffic channel to generate the scrambling code of the trunk group forward traffic channel, and use the scrambling code to generate a scrambling code for the access network The descrambling of the incoming voice data is realized.

The channel parameters of the forward traffic channel include the MAC Index of the forward traffic channel.

The channel parameters of the forward traffic channel also include the current data rate and the forward data packet format.

Before adding the access terminal to the cluster group in step A0, it further includes: the PTT server judges whether the access terminal has permission to join the cluster group according to the cluster group information, and if so, then the access terminal joins the cluster group; otherwise, the PTT server sends a group application failure message to the access terminal, and then ends.

Before establishing a cluster group in step A0, it further includes: the PTT server judges whether the access terminal has the authority to establish the cluster group according to the cluster group information, if yes, the PTT server establishes a cluster group; otherwise, the PTT server Send a group application failure message to the access terminal, and then end.

After the PTT server sends the channel parameters of the forward traffic channel of the newly created cluster group to the access terminal in step A0, it further includes: the access terminal sends a group channel assignment response message containing its own identity and cluster group number to the PTT server.

Between step A and step B further include:

The access terminal sends a user registration request message containing its own identity to the PTT server;

The PTT server stores the location information of the access terminal, and sends a successful registration message including the channel parameters of the forward shared traffic channels of all cluster groups that the access terminal is authorized to join to the access terminal, and the access terminal selects a cluster group channel parameters of the group's forward traffic channel, and monitor voice data on the group's forward traffic channel.

After the PTT server described in step B receives the call request message containing its own identity and the group number of the applied cluster group sent by the access terminal, it further includes: the PTT server judges whether the cluster group allows call preemption, and if so , then allow the access terminal to use the forward shared traffic channel to talk; otherwise, send a prohibited preemption message to the access terminal, and then end.

After the PTT server allows the access terminal to send voice information through the reverse traffic channel in step B, it further includes: the PTT server instructs the access network to establish a forward reverse traffic channel for the access terminal, and sets a channel timer. If the device times out, release the front and reverse traffic channel, or keep the front and reverse traffic channel.

After step C, it further includes: after the PTT server receives the preemption release message containing its own identity and cluster group number sent by the access terminal, it will no longer forward the reverse channel content of the PTT user on the forward shared channel, And reset the group state to allow call preemption, and then send a preemption release success message to the access terminal.

After the PTT server releases the reverse traffic channel of the speaking access terminal, it further includes: the PTT server broadcasts the available cluster group number and whether the cluster group currently allows call preemption through the forward control channel.

After step C, it further includes: when the PTT server receives the group release request message containing its own identity and cluster group number sent by the access terminal, set the cluster group as an invalid cluster group, and send a message containing the group release request message. Success message to user.

After the PTT server receives the group release request message, before setting the cluster group as an invalid cluster group, it further includes: the PTT server judges whether the user is an access terminal with the right to release the cluster group according to the cluster group information, and if so , then set the cluster group as an invalid cluster group; otherwise, send a group release failure message to the access terminal, and then end.

After the PTT server sets the cluster group as an invalid cluster group, it further includes: the PTT server broadcasts the available cluster group number and whether the cluster group currently allows call preemption through the forward control channel.

The identity of the access terminal is the unique access terminal identifier UATI of the access terminal, the International Mobile Subscriber Identity IMSI or the hardware device serial number ESN.

The present invention provides a system for realizing trunking service, the system includes HRPD system and PTT server, HRPD sends PTT service request message to PTT server, receives PTT service response message sent by PTT server, and sends voice data to PTT server , to receive the voice data forwarded by the PTT server; the PTT server receives the PTT service request message sent by the high-speed packet data system, and establishes or releases the PTT cluster group, activates or releases the reverse direction of the PTT user according to the received PTT service request message Traffic channel, or allocate a shared forward traffic channel for the PTT trunking group, and send the generated PTT business response message to the high-speed packet data system, receive voice data from the high-speed packet data system, and send the voice data to the high-speed packet data system data system. The HRPD system in the prior art does not include a PTT server. This system can implement broadcast multicast services, that is, the broadcast stream from the upper layer is delivered through the broadcast shared channel, and all users registered through the broadcast stream can listen to the broadcast. In the method of the present invention, the user can not only monitor the voice information on the shared channel, but also can apply to occupy the shared forward traffic channel to speak, and after the speech is finished, the user can release the forward traffic channel to realize the trunking service.

The system and method of the present invention can allocate cluster users according to cluster groups, users can apply to join a cluster group, establish a cluster group or release a cluster group, and the PTT server can manage the authority and status of all cluster users, However, the prior art cannot manage cluster users, so the system and method of the present invention are relatively complete systems and methods for realizing cluster services.

Description of drawings

Figure 1 is a network structure diagram of the HRPD system.

Fig. 2 is a network structure diagram of an HRPD system according to an embodiment of the present invention.

Fig. 3 is a network structure diagram of an HRPD system according to another embodiment of the present invention.

Fig. 4 is a flow chart of the PTT user registration process of the method for realizing the trunking service according to the present invention.

Fig. 5 is a flow chart of the PTT group application process of the method for realizing the trunking service according to the present invention.

Fig. 6 is a flow chart of the call preemption and call release procedures of the method for implementing trunking services according to the present invention.

Fig. 7 is a flow chart of the PTT group release process of the method for implementing trunking services according to the present invention.

Fig. 8 is a network structure diagram of an HRPD system according to a third embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

In order to realize the management and scheduling of cluster users, the present invention adds a cluster management scheduling server: a PTT server on the basis of the original HRPD system, and the PTT server is directly connected to the AN through the newly added interface A _PTT . A PTT server can manage one or more cluster users within the scope of AN management. The PTT server stores cluster group information, user information of all cluster users within its coverage area, and current cluster service usage status of all cluster users. PTT servers are connected to each other through Internet routes or dedicated links, and the system assigns independent addresses to each PTT server.

Fig. 2 is the network structural diagram of realizing the HRPD system of cluster business according to the present invention, as can be seen from Fig. 2, PTT server is connected with AN through APTT interface, and each PTT server can connect a plurality of ANs, and a plurality of PTT servers connected via the Internet.

AT sends a PTT service request message to AN, and AN judges that the received message is a PTT service message, then forwards the PTT service request message to the PTT server, and the PTT server establishes a PTT group according to the received PTT service request message and assigns the group Shared forward traffic channel, add user to a PTT group, activate or release reverse traffic channel of PTT user, set PTT group status or release PTT group, and send PTT business response message to AN, AN responds to the PTT business The message is forwarded to the AT. The AT needs to go through a certain upgrade to realize the PTT service. In the following, the AT refers to the AT with the PTT function.

It should be noted that Figure 2 only shows the Internet connection, and the system assigns an independent IP address to the PTT server. In practical applications, PTTs can also be connected in other ways, for example, using dedicated links. Connection, that is, multiple PTT servers are connected through dedicated links, as shown in Figure 3. In addition, the PTT server is a logically independent entity, which can be merged with AN AAA physically.

The present invention also provides a method for the HRPD system to realize trunking services. The method includes several processes: PTT user registration process, PTT group application process, call preemption and call release process, and group release process.

When the user starts up or switches to a new AN, he needs to re-register in the PTT server. Fig. 4 is a flow chart of the PTT user registration process according to the method for realizing the trunking service of the present invention. As can be seen from Fig. 4, the process includes Follow the steps below:

Step 401: AT sends a PTT registration message to AN on the access channel, the registration message includes the user's unique access terminal identifier (UATI), international mobile subscriber identity (IMSI) hardware serial number (ESN).

In the HRPD network, after the user starts up, the network assigns a UATI to the user. Although the UATI can be used to identify an AT, a UATI will be reassigned every time the user restarts or switches networks. The reassigned UATI is the same as the last assigned The UATI may be different. Therefore, when storing the status of user information in the PTT server, it is recommended to use the ESN or the user's International Mobile Subscriber Identity (IMSI) to uniquely identify the user. Therefore, the parameters reported in the registration message except In addition to UATI, it may also include the user's ESN or IMSI.

Step 402: After receiving the PTT registration message from the AT, the AN sends the registration message to the PTT server.

Step 403: The PTT server judges whether the user is a legal PTT user according to the received UATI and ESN, if yes, go to step 404; otherwise, go to step 406.

Step 404: The PTT server records the location information of the access terminal, and sends a PTT registration success message to the AN, the registration success message includes the user's UATI and the media access of all PTT groups that the user has the right to join stored in the PTT server Control number (MACIndex).

Step 405: AN sends a registration success message to AT, and then goes to step 408.

Step 406: The PTT server sends a PTT registration failure message to the AN, and the registration failure message includes the user's UATI.

Step 407: AN sends a registration failure message to AT.

Step 408: The AT selects a MACIndex of a PTT group from the MACIndexes of all PTT groups, and synthesizes the scrambling code of the forward traffic channel shared by the group, so that the AT can monitor the forward traffic channel of the group.

The initial sequence of the shift register for scrambling code generation is [1111111r5r4r3r2r1r0d3d2d1d0], where r5r4r3r2r1r0 is the MACIndex value of the 6-bit forward traffic channel, and the value of d3d2d1d0 is determined by the specific forward data rate. Therefore, the user can obtain the scrambling code of the forward traffic channel after knowing the MACIndex value and data rate of the current forward traffic channel. In a certain situation, if the specific forward data rate is a fixed value, the scrambling code of the forward traffic channel can be obtained only by knowing the MACIndex value of the forward traffic channel, so as to monitor the forward traffic channel.

After successful PTT registration, the AT can already monitor the forward traffic channel of a PTT group. For an AT that has the authority to create a new PTT group, it can implement a new PTT group through the process of applying for group building. Figure 5 is a clustering implementation according to the present invention The flow chart of the PTT group application process of the business method, as can be seen from Figure 5, the process includes the following steps:.

Step 501: the AT sends a PTT group application message to the AN, and the group creation application message includes the user's UATI and the group number for applying for a new group.

Step 502: AN sends the group application message to the PTT server.

Step 503: The PTT server judges whether the group applied by the user exists, and if yes, then go to step 505; otherwise, go to step 504.

Step 504: The PTT server judges whether the user has the right to create the PTT group, if yes, go to step 508; otherwise, go to step 506.

Step 505: The PTT server judges whether the user is a legal user of the group, if yes, go to step 511; otherwise, go to step 506.

Step 506: The PTT server sends the failure to create a PTT group to the AN, and the message includes the user's UATI and the group number of the newly created PTT group.

Step 507: AN sends the group application failure message to AT, and then ends.

Step 508: The PTT server establishes a new cluster group and stores the information of the cluster group. The cluster group information includes users who have permission to join the cluster group, and users who have the permission to create and release the cluster group, and then Send the PTT group establishment permission to the AN, the message includes the user's UATI and the new PTT group number.

Step 509: AN receives the PTT group formation permission message from the PTT server, and returns a permission response message to the PTT server.

Step 510: the AN allocates the forward and reverse channel resources of the group, and establishes the forward traffic channel.

Step 511: the AN sends the PTT group channel assignment message to the AT, and the PTT group channel assignment message includes parameters such as group number and assigned MACIndex. If the forward channel data rate is assigned by the AN, the message also includes the forward data rate or forward data packet format.

Step 512: the AT synthesizes the scrambling codes of the shared forward traffic channels of the group, so that the AT can monitor the forward traffic channels of the group.

Step 513: The PTT server broadcasts PTT group status information on the forward channel, and the group status information includes information such as available PTT group numbers and group status (whether call preemption is allowed).

After the AT has joined a PTT group, if the user wants to occupy the forward traffic channel of the PTT group to issue a message, call preemption is required, and the message is released after the PTT server allows it. When the release ends, the call needs to be released. Fig. 6 is the flowchart of the preemption and preemption release process of the method for realizing the cluster business according to the present invention. As can be seen from Fig. 6, the process includes the following steps:

Step 601: the AT sends a PTT call request message to the AN, and the preemption request message includes parameters such as the user's UATI and group number.

Step 602: AN sends the preemption request information to the PTT server.

Step 603: The PTT server judges whether the user is a legitimate user, if yes, go to step 604; otherwise, go to step 609.

Step 604: The PTT server judges the usage status of the group, if the group forward channel is idle, then go to step 605; otherwise, go to step 607.

Step 605: The PTT server sends a PTT call permission message to the AN. The call permission message includes parameters such as the user's UATI and group number, and at the same time, other users are prohibited from preempting the PTT group.

Step 606: AN sends the preemption permission message to AT, and then goes to step 611.

Step 607: The PTT server sends a PTT preemption prohibition message to the AN. The preemption prohibition message includes parameters such as the user's UATI and group number.

Step 608: AN sends the preemption forbidden message to AT, and then ends.

Step 609: The PTT server sends a PTT call request failure message to the AN, and the call request failure message includes parameters such as the user's UATI and group number.

Step 610: AN sends the preemption request failure message to AT, and then ends.

Step 611: AT establishes a reverse traffic channel or speaks through an existing reverse traffic channel, and AN directly forwards the reverse data packet sent by AT to the PTT server, and the PTT server forwards the reverse data packet to other users who have established the reverse traffic channel. The PTT server of the PTT group sends it to all ATs in the group through the assigned forward channel corresponding to the PTT group.

Step 612: The PTT server judges whether the call time exceeds the set call time threshold, and if so, proceeds to step 615; otherwise, returns to step 612, and continues to judge whether the call time exceeds the set call time threshold.

Step 613: The AT sends a PTT preemption release message to the AN, and the call release message includes parameters such as the user's UATI and group number.

Step 614: the AN returns a PTT preemption release response message to the AT, and forwards the preemption release message to the PTT server.

Step 615: The PTT server no longer forwards the PTT user's reverse channel content on the forward shared channel, and resets the group status to allow preemption.

Step 616: The PTT server sends a PTT preemption release success message to the AN, and the preemption release success message includes the user's UATI and group number.

Step 617: AN sends the preemption release success message to AT.

Step 618: The PTT server broadcasts PTT group status information on the forward channel, and the group status information includes available PTT group numbers, group status (whether call preemption is allowed) and other information.

If the user wishes to cancel a PTT group, he should apply to the PTT server to release the PTT group. Fig. 7 is a flow chart of the PTT group release process according to the method for realizing cluster business according to the present invention. As can be seen from Fig. 7, the process includes the following step:

Step 701: the AT sends a PTT group release request message to the AN, and the group release request message includes parameters such as the user's UATI and group number.

Step 702: the AN sends a PTT group release response message to the AT, and forwards the group release request message to the PTT server.

Step 703: The PTT server judges whether the user has the right to release the PTT group, if yes, go to step 704; otherwise, go to step 707.

Step 704: The PTT server sets the PTT group as an invalid PTT group in the database, and at the same time updates the group status of the PTT group on other PTT servers.

Step 705: The PTT server sends a PTT group release success message to the AN, and the group release success message includes the user's UATI and group number.

Step 706: AN sends the group release success message to AT, and then goes to step 609.

Step 707: The PTT server sends a PTT group release failure message to the AN, and the group release failure message includes the user's UATI and group number.

Step 708: AN sends the group release failure message to AT.

Step 709: The PTT server broadcasts the PTT group status information on the forward channel. The group status information includes the available PTT group number, group status (whether call preemption is allowed), and the forward rate of each available PTT group.

Appropriate improvements can be made to the method according to the present invention in the specific implementation process to meet the specific needs of specific situations. For example, the PTT server can also be connected to the PDSN of the HRPD system. As shown in Figure 8, various PTT-related commands sent by the AT are directly uploaded to the PDSN through the A interface, and then forwarded by the PDSN to the PTT server. Relevant PTT command messages are sent to PDSN first, and then sent to AT by PDSN. In this case, the PTT server mainly completes user authentication and management, and maintains various status messages of PTT. The data exchange part is performed by the original network. The PDSN is completed, and the PTT server and other PTT servers can be connected through an Internet router or through a dedicated link. Therefore, it can be understood that the specific implementation manners according to the present invention are only exemplary, and are not intended to limit the protection scope of the present invention.

Claims (24)

1. A system for realizing trunking services, the system comprising a high-speed packet data HRPD system, characterized in that the system further comprises: a push-to-talk PTT server and an access terminal; Described PTT server and HRPD system are connected through the special-purpose interface of cluster business, are used for setting up cluster group, for newly-built cluster group distribution front reverse business channel, setting includes the group number of cluster group, each cluster group shared The cluster group information of the channel parameters of the forward traffic channel; after receiving the preemption request message containing its own identity and the group number of the applied cluster group sent by the access terminal with PTT function, the access terminal is allowed to pass The reverse traffic channel sends the voice information, sends the voice information on the forward shared channel, broadcasts the voice information through the shared forward traffic channel corresponding to the trunk group, and the access terminals in the trunk group, according to the The channel parameters of the forward traffic channel are monitored, and the voice information on the corresponding forward traffic channel is monitored. 2. The system for realizing cluster services according to claim 1, wherein the HRPD system includes an access network connected to an access terminal having a PTT function through an air interface, and the PTT server and the access network are connected through a cluster Service-specific interface connections, where, The PTT server is further used to authenticate the access terminal with the PTT function through the access network, and complete the registration of the access terminal, group application and release of the trunking service. 3. The system for realizing cluster services according to claim 1, wherein the HRPD system includes an access network connected to an access terminal with a PTT function, a packet control function PCF and a packet data service node PDSN, The access terminal is connected to the access network through an air interface, the access network is connected to the PCF, and the PCF is connected to the PDSN through a standard A interface, and the PTT server is connected to the PDSN through a trunking service-specific interface. 4. The system for realizing cluster services according to claim 2 or 3, wherein the PTT server is connected with other PTT servers through an Internet router. 5. The system for realizing cluster services according to claim 2 or 3, wherein the PTT server is connected with other PTT servers through a dedicated link. 6. A method for realizing cluster services, characterized in that the method comprises the following steps: A, set up the cluster group by the PTT server, allocate the front reverse traffic channel for this new cluster group, and set the cluster group information in the PTT server, the cluster group information includes the group number of the cluster group, each Channel parameters of the forward traffic channel shared by the trunking group; B. When the PTT server receives the preemption request message sent by the access terminal with the PTT function, which contains its own identity and the group number of the applied cluster group, the PTT server allows the access terminal to send voice through the reverse traffic channel The information is sent to the PTT server, and the PTT server sends the voice information to the shared channel before the PTT; C. The PTT server broadcasts the voice information through the shared forward traffic channel corresponding to the trunk group, and the access terminals in the trunk group listen to the corresponding forward traffic channel according to the channel parameters of the forward traffic channel Voice messages on . 7. The method for realizing cluster services according to claim 6, wherein step A comprises: A0. After receiving the group application request message sent by the access terminal, the PTT server judges whether the group applied by the access terminal exists. Send the channel parameters of the traffic channel to the access terminal, if it does not exist, establish a cluster group, assign the channel parameters of the shared forward traffic channel to the cluster group, and send the channel parameters to the access terminal . 8. The method for realizing cluster services according to claim 6, wherein the information of the cluster group also includes the identity of the access terminal authorized to join the cluster group, and the access terminal authorized to establish and release the cluster group The identity of the access terminal for the group. 9. The method for realizing cluster services according to claim 6, wherein the cluster group information further includes cluster group status information. 10. The method for realizing trunking services according to claim 6, characterized in that, the voice information on the corresponding forward traffic channel is monitored by the access terminal according to the channel parameters of the forward traffic channel in step C. The scrambling code of the forward traffic channel of the group is realized by using the scrambling code to descramble the voice data sent from the access network. 11. The method for realizing trunking services according to claim 10, wherein the channel parameters of the forward traffic channel include a MAC Index of the forward traffic channel. 12. The method for realizing trunking services according to claim 11, wherein the channel parameters of the forward traffic channel also include a current data rate and a forward data packet format. 13. The method for realizing trunking services according to claim 7, wherein before adding the access terminal to the trunking group in step A0, further comprising: the PTT server judges whether the access terminal is based on the trunking group information Have permission to join the cluster group, if yes, then the access terminal joins the cluster group; otherwise, the PTT server sends a group application failure message to the access terminal, and then ends. 14. The method for realizing trunking services according to claim 7, characterized in that, before establishing a trunking group in step A0, further comprising: the PTT server judges whether the access terminal has the authority to establish the trunking group according to the trunking group information Group, if yes, the PTT server establishes a cluster group; otherwise, the PTT server sends a group application failure message to the access terminal, and then ends. 15. The method for realizing trunking services according to claim 7, characterized in that, after the PTT server sends the channel parameters of the forward traffic channel of the newly created trunking group to the access terminal in step A0, further comprising: accessing The terminal sends a group channel assignment response message including its own identity and the cluster group number to the PTT server. 16. The method for realizing cluster business according to claim 6, characterized in that, further comprising between step A and step B: The access terminal sends a user registration request message containing its own identity to the PTT server; The PTT server stores the location information of the access terminal, and sends a successful registration message including the channel parameters of the forward shared traffic channels of all cluster groups that the access terminal is authorized to join to the access terminal, and the access terminal selects a cluster group channel parameters of the group's forward traffic channel, and monitor voice data on the group's forward traffic channel. 17. The method for realizing trunking services according to claim 6, wherein the PTT server in step B receives a call request message containing its own identity and the group number of the applied trunking group sent by the access terminal Afterwards, it further includes: the PTT server judges whether the trunking group allows call preemption, and if so, allows the access terminal to use the forward shared traffic channel to talk; otherwise, sends a prohibition preemption message to the access terminal, and then ends. 18. The method for realizing trunking services according to claim 6, characterized in that, after the PTT server allows the access terminal to send voice information through the reverse traffic channel in step B, further comprising: the PTT server instructs the access network to The access terminal establishes a forward reverse traffic channel and sets a channel timer. If the channel timer times out, the forward reverse traffic channel is released; otherwise, the forward reverse traffic channel is maintained. 19. The method for realizing cluster services according to claim 6, characterized in that after step C, it further comprises: after the PTT server receives the preemption release message containing its own identity and cluster group number sent by the access terminal , no longer forward the reverse channel content of the PTT user on the forward shared channel, and reset the group state to allow call preemption, and then send a preemption release success message to the access terminal. 20. The method for realizing trunking services according to claim 19, characterized in that, after the PTT server releases the reverse traffic channel of the access terminal for speaking, it further comprises: the PTT server broadcasts through the forward control channel the available Indicates whether the cluster group number and the cluster group currently allow call preemption. 21. The method for realizing cluster services according to claim 6, characterized in that, after step C, it further comprises: when the PTT server receives a group release request containing its own identity and cluster group number sent by the access terminal After the message, set the cluster group as an invalid cluster group, and send a message containing the successful release of the group to the user. 22. The method for realizing cluster services according to claim 21, characterized in that, after the PTT server receives the group release request message, before setting the cluster group as an invalid cluster group, further comprising: the PTT server according to the cluster group The information determines whether the user is an access terminal with the right to release the cluster group, and if so, sets the cluster group as an invalid cluster group; otherwise, sends a group release failure message to the access terminal, and then ends. 23. The method for realizing trunking services according to claim 21, wherein after the PTT server sets the trunking group as an invalid trunking group, it further includes: the PTT server broadcasts the available trunking group through the forward control channel Whether the number and cluster group currently allow call preemption. 24. The method for realizing trunking services according to claim 6, wherein the identity of the access terminal is the unique access terminal identifier (UATI) of the access terminal, the International Mobile Subscriber Identity (IMSI) or the serial number of the hardware device ESN.

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