RU2392778C2 - Roaming method for trunking digital communications network - Google Patents

Abstract

FIELD: physics, communications.

SUBSTANCE: invention relates to communication engineering. The trunking digital communications system includes a base station subsystem, a switching subsystem, a sending subsystem and a data packet subsystem. Roaming takes place under a controlled sending subsystem. A local trunking digital communications system is connected to the network IP through a dispatching sever and a dispatching local register of the sending subsystem and is mutually connected to the trunking system of another region. The roaming method of the trunking system involves: user registration roaming, roaming of a user initiating a private call, roaming of a user initiating a group call, administration via message rights, call free-up and sending voice messages.

EFFECT: providing a user with roaming support for different services in the entire network coverage area.

13 cl, 13 dwg

Description

FIELD OF THE INVENTION

The present invention relates to the field of digital communication with the organization of a backbone network (trunking), in particular to a method for roaming for a digital communication system with trunking. Such a system and method allows the mobile terminal of the trunk to implement the function of roaming (automatic tuning to the local communication network) in the range of the network of the trunking system.

BACKGROUND OF THE INVENTION

A trunked communications system is an important industry in a mobile communications system. A necessary function of the trunking system is to support roaming, which directly decides whether the system is capable of providing service to the entire network. Since the trunking service has special features, such as a one-to-many call, late data entry, dynamic regrouping, etc., and the roaming mechanism of this mobile communication system is intended for connecting to regular telephones, it cannot be fully applied in the trunking system. Therefore, it is especially important to find a roaming method that is consistent with the development trend of the technology of trunking systems.

Some patent documents are available in the art, such as a Chinese patent (publication number CN 1138279) entitled “Communication method and cellular concentration system based on exchange with a programmed control”, a US patent (publication number CA 1282462) called “Backbone communication system” for the possibility of roaming throughout the country ”and a European patent (publication number WO 9105429) entitled“ A trunking network with automatic roaming without centralized management ”.

The Chinese patent (publication number CN 1138279) has the following disadvantages:

firstly, the control center is used to manage various services, such as telephone service, trunking service, etc. In the case when the relevant services are in a high degree of communication, the control center becomes a bottleneck for all types of services;

secondly, the roaming user control method is at the user level and simply shows the control logic of the individual user, and not the full call-based control method. However, due to a trunk call related to a plurality of users, the call level control method comprises a control method for the called / called user and a working method for cooperating with the respective systems.

The US patent (publication number CA 1282462) has the following disadvantages:

firstly, it is necessary for the terminal to carry out special processing regarding roaming, i.e. the terminal needs to identify whether or not it is necessary to automatically configure itself in order to carry out the corresponding processing. This increases the complexity of the roaming mechanism;

secondly, the implementation of all network roaming requires the participation of one central control node, which leads to the fact that support for roaming the entire network is limited by the connection range of the central control node. Moreover, the central control unit is a “filter” (?) For processing the service process. Paralysis of the central management node will cause the roaming service of the entire network to fail.

The European patent (WO 9105429) has the following disadvantages:

firstly, the implementation of roaming requires the cooperative management of the control center and the local computer (gateway) in the respective systems, and the procedure for the roaming service is relatively complicated;

secondly, the method of managing user roaming is at the user level and simply shows the control logic of the individual user, and not the complete control method based on the call level.

Therefore, in the prior art there are some disadvantages that need to be addressed.

SUMMARY OF THE INVENTION

Regarding a number of the aforementioned problems in the prior art, an object of the present invention is to provide a method for performing roaming for a digital communication system with trunking, which supported all network roaming, in order to ensure joint normal flow of all types of services for roaming users. More specifically, this invention has the following objectives:

1. Separation of the unitary control center of the trunking system into appropriate subsystems in accordance with their services, the switching subsystem being used to support roaming of the entire telephone service network, the packet data subsystem is used to support roaming of the entire network of packet data services, the sending subsystem is used to support roaming of the entire network trunking services, etc., and such a separation mechanism makes the design and implementation of various services, such as telephone services, packet data services nykh, trunking services, etc., are more defined and distinct and allows more flexible and independent deployment and operation of various services, so that the complexity and degree of connection of system services are significantly reduced.

2. Simplification of the implementation of terminal roaming, so that roaming is implemented without performing special processing related to roaming, i.e. roaming is transparent to the terminal, which greatly simplifies the roaming mechanism.

3. Using the peer-to-peer structure of the roaming network without the participation and management of the central control node, while roaming other services, such as telephone services, packet data services, etc., follows the principles related to the existing mobile communication system and can inherit the function and advantages of the existing systems; Roaming of the trunking service is connected to the external IP network through the dispatch server (PTT dispatch server, abbreviated “PDS” hereinafter) and the local dispatch register (local PTT register, abbreviated “PHR” hereinafter) of the separate sending subsystem, thereby realizing signal transmission on the trunk and data streams through the powerful routing ability of an IP network, the respective sending systems being equitable, so that the topology of the system becomes more flexible, the stream is more compact, the coverage area of roaming is wider second, and the system more robust fault tolerance.

4. Simplification of the system management strategy for the roaming user, moreover, for trunking services, both the roaming user and non-roaming user are controlled by PDS, so that the complexity of the service flow is significantly reduced.

5. For trunking services, the creation of a method at the call level, whereby roaming user visits serve as a control point for a private trunk call, and local roaming trunking systems serve as a control point for a call for a trunk group call. This method is able to maintain the consistency of the process performed by the system on roaming and non-roaming calls, and always ensures the status of calls where they can be monitored by the dispatch console, so that the system is more manageable.

TECHNICAL DECISION OF THIS INVENTION

A method of performing roaming for a digital communication system with the organization of a backbone network, wherein said digital communication system with the organization of a backbone network (trunking) comprises a base station subsystem, a switching subsystem, a sending subsystem, and a packet data subsystem.

The specified method involves: the presence of the indicated roaming, which is controlled by the sending subsystem, of a local digital communication system with trunking, which connects to the IP network through the dispatch server and the dispatching local register of its sending subsystem in order to connect to the trunking system within another region.

The indicated roaming method for the trunking system, in addition, involves registering a roaming user, initiating a roaming user a private call on a trunk, initiating a roaming user a group call on a trunk, administering message rights (floor management), releasing a call, and forwarding voice messages.

In this method, the roaming user registration process includes the following steps:

a1) acceptance by users of the trunking system of a unique identifying code, which is laid out sequentially throughout the network and serves as the basis for user messages on the route;

b1) when the roaming user is a trunking user, the roaming user initiates the registration of the location of the trunking service, and the route of the visited subsystem trunking system is based on the information of the user identification code, and it sends it over the network to the sending subsystem, which records the latest information about the user's registered position trunking.

In this method, the process of initiating a private call roaming by a user includes the following steps:

a2) a roaming user initiates a private call request, the route of the visited sending sender subsystem based on information about the user identification code and sending an authentication request to the local dispatch subsystem of the sender, and the local sending sender subsystem authenticates the user;

b2) upon receipt of an authentication response and authorization information returned by the local sending sender subsystem, the visited sender sending subsystem considers that the user is in a roaming state; the visited sending subsystem of the sender is designated as a monitoring point for roaming a private call to control the connection procedure of the entire call; the visited sending subsystem of the sender informs the cooperating sending subsystem of the basic information of this call, the local sending subsystem of the called user sets up a private call in advance to prepare for the next step, namely the establishment of the call;

c2) the visited sending subsystem of the sender sends pager signals to the sender through the base station and adds the sender to a private call;

d2) the visited sending subsystem of the sender informs the called user via the pager through the local sending subsystem of the called user and adds the called user to the private call;

f2) the visited sending subsystem of the sender authorizes the right to a message for the sender;

f2) the visited sending subsystem of the sender sends a command to the local sending subsystem of the called user indicating that the right to the message has been used to inform that the right to the message is authorized for the sender.

In the indicated method, step a2) further includes the following: the local sending subsystem of the called user is involved in the authentication of the called user in the case when the called user and the sender are not in the same region.

In this method, a user initiating a roaming of a group call includes the following steps:

a3) a roaming user initiates a group call request, the route of the visited sender sending subsystem based on information about the user identification code and sending an authentication request to the local sending sender subsystem, then the local sending sender subsystem authenticates the user;

b3) upon receipt of an authentication response and authorization information returned by the local sender sending subsystem, the visited sender sending subsystem considers that the user is in a roaming state; the visited sending subsystem of the sender sends a group call request from the sender to the local sending subsystem of the sender to provide a control right to the group call to the local sending subsystem of the sender;

c3) the local sending subsystem of the sender becomes the control point for the group call after acquiring the control right to the call; the local sending subsystem again authenticates the trunking call and receives information about all called users for this group call;

d3) the local sending subsystem sends the paging signals to the sender through the visited sending subsystem and the wireless base station and adds the sender to the group call;

e3) the local sending sender subsystem sends paging signals to local non-roaming users through the base station and adds these users to this group call;

f3) the local sender sending subsystem authorizes the right to message the sender through the visited sender sending subsystem;

g3) the local sending subsystem of the sender sends a command to the local sending subsystem of the called roaming user indicating that the right to the message has been granted to notify that the right to the message has been granted to the sender.

This method, in addition, involves:

e31) in the case where there are some members of the group other than the sender who is not roaming locally, the local sender subsystem further informs the visited roaming user subsystem of the basic information about this call, the visited roaming user subsystem sets the group call in advance to prepare for the next step, that is, the establishment of a call, sending paging signals to the called user through the visited subsystem of the user sending roaming and rovodnuyu base station and adding these users roaming into the group call.

In this method, the message rights administration process includes the following steps:

a4) in a private call or group call, in the case when the user initiates a request with a request for the right to a message or initiates a request to release the right to a message, the cooperating parcel subsystem sends a request to the main parcel management subsystem to obtain a verdict when the sender is found within service coverage areas of the collaborating package subsystem;

b4) when the user initiates a request with an application for the right to message, the main parcel management subsystem provides the right to message directly to the sender and informs accordingly the cooperating sending subsystems that the right to message has already been granted if the right to message has not been authorized at this time for other users; the sender is added to the queue with applications for the right to message, and the queue procedure for the right to message is performed, when the right to the message is now granted to another user, the priority of the right to message the sender is not higher than that of the holder of the right to message; and the main parcel management subsystem releases the right to the speaker’s message, granting the right to the message to the sender and informs the respective cooperating parcel subsystems that the right to the message has been granted if the right to the message has now been granted to another user, and the priority of the right to the message of the sender is higher, than the owner of the right to a message;

c4) when the user initiates a request for the release of the right to a message, the corresponding cooperating parcel subsystem sends a request to the main parcel management subsystem if the sender is detected within the scope of the cooperating parcel subsystem; the main parcel management subsystem gives an immediate response to the specified request if the sender is detected within the scope of the main parcel management subsystem;

d4) the main parcel management subsystem releases the right to a message and informs the relevant cooperating parcel subsystems.

In the process of releasing a call, the main package management subsystem takes charge of releasing the call.

In this method, the process of releasing a call, in the event that a user who is in the coverage area of the main parcel management subsystem initiates a request for releasing a call, the following is provided:

A5) the user initiates a request to release the call, the main parcel management subsystem releases the sender and simultaneously releases other users within its own service area;

b5) the main parcel management subsystem informs the relevant cooperating parcel subsystems of the need to release all users participating in this call in its respective service coverage area;

c5) the whole process of releasing a call ends after the corresponding cooperating sending subsystems give a response to the main control subsystem that the release is completed.

In this method, a call release process, if a user initiates a call release request within a collaborative sending subsystem, further provides as follows:

a6) the user initiates a request to release the call, and the collaborating sending subsystem sends this request to the main package control subsystem;

b6) the main parcel management subsystem informs the relevant cooperating parcel subsystems of the need to release all users participating in this call in its respective service coverage area;

c6) after the relevant cooperating parcel subsystems have responded that the release is completed, to the main parcel management subsystem, the main parcel management subsystem frees all users participating in this call in its own service area, and the whole call release process ends.

In the process of forwarding voice messages, if voice messages need to be forwarded between cooperating dispatch servers, the main managing dispatch server is responsible for forwarding voice messages, and voice messages are not forwarded directly between cooperating dispatch servers.

In this method, the process of sending voice messages, if the user speaks in the main subsystem for managing parcels, assumes the following:

a7) the user receives the right to message and speaks, and the main parcel management subsystem first sends the voice packet to other users in its own service area;

b7) the main parcel management subsystem forwards the voice packet to other cooperating parcel subsystems, and the corresponding cooperating subsystems forward the speech packet to users in their service areas.

In this method, the process of sending voice messages, if the user speaks in a collaborative sending subsystem, in addition, provides:

a8) the user receives the right to message and speaks, and the cooperating sending subsystem first sends the voice packet to other users in its service area and at the same time sends the voice packet to the main parcel management subsystem;

b8) the main parcel management subsystem forwards the voice packet to users in its service area and at the same time forwards the voice packet to other cooperating parcel subsystems;

c8) collaborating sending subsystems forward the voice packet to users in their service areas.

The present invention provides a method for implementing roaming for a digital communication system with trunking. Compared with the prior art, the local sender sending subsystem acts as the main private call sending subsystem, and the local sender sending subsystem acts as the main group call sending subsystem, and the roaming service of the trunking service is transparent to the terminal, so that the compatibility effect of the calling procedure is achieved for roaming users and non-roaming users in the system, the roaming mechanism of the trunking service is simplified, the complexity of the system is reduced, and efforts aetsya possibility of administration premises (Dispatching Administration) in the system. The method of the present invention involves registering a roaming user, initiating a private call by a roaming user, initiating a roaming user a group call, an administration method for the right to a message, a call release method and a method for sending voice messages, therefore, the effect of realizing user roaming in a network coverage area with a trunking system is achieved.

Moreover, the method of the present invention provides for dividing a unitary control center of a trunking system into corresponding subsystems based on a service, such a separation mechanism makes the corresponding services more defined and distinct and allows to increase the flexibility and independence of the deployment and operation of various services, so that the effect of reducing complexity and degree is achieved communication system services.

In addition, the method of the present invention simplifies a system management strategy for a roaming user, management of trunking services for a roaming user and a non-roaming user is implemented by PDS without participating in the management of other logical entities, which reduces the complexity of the service flow.

Brief Description of the Drawings

Figure 1 shows a diagram of a network structure of a digital trunked communication system according to the present invention, which supports roaming;

figure 2 shows a diagram of the compositional structure of the subsystem of the sending system of the trunking system according to this invention;

FIG. 3 shows a block diagram of a roaming user registration system according to the present invention; FIG.

4 is a block diagram of a system that shows that a roaming user initiates a private call according to this invention;

5 is a block diagram of a system that shows that a roaming user initiates a group call according to the present invention;

6-a is a block diagram showing that the user is applying for the right to a message in the main package management subsystem according to this invention;

Fig.6-b is a block diagram showing that the user is applying for the right to a message in a collaborative sending subsystem according to this invention;

6-c is a block diagram showing that the user releases the right to a message in the main package management subsystem according to this invention;

6-d is a block diagram showing that the user releases the right to a message in the cooperating sending subsystem according to this invention;

Fig. 7 a is a block diagram showing that the user releases a call in the collaborative sending subsystem according to this invention;

FIG. 7-b is a block diagram showing that a user is releasing a call in a collaborative sending subsystem according to this invention;

FIG. 8 a is a schematic diagram showing that a voice message is transmitted when the user speaks, according to this invention, in the main package management subsystem;

FIG. 8-b is a block diagram showing that a voice message is forwarded when the user speaks in a collaborative sending subsystem according to the present invention.

MODES FOR CARRYING OUT THE INVENTION

The corresponding preferred embodiments of the present invention are now described in detail in conjunction with the drawings.

The digital communication system with trunking of the present invention contains the following main subsystems: a base station subsystem, a switching subsystem, a sending subsystem, and a packet data subsystem. Moreover, the base station subsystem performs the function of access to various terminal services; the switching subsystem performs the function of controlling and switching the telephone service of the terminal in its service area and serves as the control center of the telephone service; the sending subsystem performs the function of managing and administering the terminal's trunking service from its service coverage area and serves as the trunking control center; the packet data subsystem performs the control and access to the packet data service of the terminal in its service area and serves as the control center for the packet data service. In addition, based on the indicated basic composition of the subsystems, components such as the short message subsystem, the smart grid subsystem, the positioning subsystem, etc., can also be configured to create a large number of services.

The method of networking a trunking system according to this invention is a moduleing method, where the system is divided on the basis of service into several relatively independent subsystems, and each subsystem can be developed in the light of its prior art. This method of networking makes the design and implementation of various services more specific and distinct, such as telephone services, packet data services, trunking services, etc., and allows more flexible and independent deployment and operation of various services, so that the complexity of the system and the degree communications between different services are greatly reduced.

Support for the trunking system of this invention for roaming includes support for roaming various user services. The trunking system according to this invention is a combination of trunking communications and modern mobile communication technologies, thus, in addition to the trunking service, other types of services, such as telephone services, packet data services, short message services, etc., as well as their roaming, supported by the system, follow the relevant standard of the existing mobile communication system, which is not necessary to describe in detail here. The method of roaming a trunking system according to this invention is particularly emphasized in the description of support for roaming of a user trunking service, and the roaming of a trunking service is implemented by the send subsystem of the trunking system according to this invention, where the local trunking system is connected to the IP network via PDS and PHR of the send subsystem to interconnect the systems trunking within other regions.

The method of roaming a trunking system according to this invention includes the following processes: registering a roaming user, initiating a roaming user a private call, initiating a roaming user a group call, administering the right to a message, releasing a call and forwarding voice messages, etc.

In a method for performing roaming in a digital trunked communication system according to the present invention, a plurality of trunking systems must participate in a roaming call, and intermediate trunking systems that are primarily involved in transparent signal transmission or signal transmission may be involved. For convenience of description, a description regarding the intermediate trunking system is omitted in the following method description. In a trunking call with roaming, the trunking system that controls the flow of the entire call is called the trunking control system. The main trunking management system manages the connection flow of the entire call, maintains all the information of the entire call, and administers the distribution of the right to a message for the call. A commonly visited sender trunking system serves as the main private call trunking management system, and a local sender trunking system serves as the main trunking trunking management system. Other trunking systems involved in a roaming trunk call that exclude the main trunking control system and intermediate trunking systems are known as cooperative trunking systems. Collaborative trunking systems act as destination trunking systems.

For convenience of description, in this invention, the commands of the trunking system for paging (search call) of multiple users, the release of multiple users, etc. are processed sequentially; they can also be processed in parallel in practice, i.e. a trunking system can pager multiple users at the same time or release multiple users at the same time.

A network diagram of a trunking system according to the present invention is shown in FIG. 1, and corresponding components are explained as follows.

A terminal is a terminal device that has the function of a trunking service, which simultaneously has many service capabilities, such as telephone service, packet data service, short message service, and capable of roaming in the coverage area of the entire system network.

Base station subsystem: performs the function of accessing the terminal and assigning a service based on the type of service used by users, the corresponding subsystem.

Switching subsystem: performs the function of controlling and switching (switching) the telephone service of the terminal in its service area and serves as the control center of the telephone service, and the switching subsystems are connected to each other via the public telephone network.

The sending subsystem: performs the management and administration function of the terminal trunking service in its service area and serves as the control center for the trunking service. The sending subsystems are connected to each other via an IP network.

Packet data subsystem: performs the function of managing and accessing the packet data service of the terminal in its service area and serves as the control center for the packet data service, and the packet data subsystems are connected to each other via an IP network.

Other subsystems: based on the foregoing, the basic composition of the subsystems, components such as the short message subsystem, the smart grid subsystem, the positioning subsystem, etc., can also be configured to provide a variety of services.

In this trunking system, each type of service, such as telephone services, trunking service, packet data service, etc., is executed, monitored and processed by the corresponding subsystem, such as switching subsystem, sending subsystem, packet data subsystem, etc .; and roaming support for each type of service is provided by mutually connected networks between the respective subsystems. The mutually connected networks between these subsystems, together with the trunking systems of the respective regions, form the network of the trunking system of the entire network coverage area to provide users with support for roaming various services in the coverage area of the entire network.

A diagram of the compositional structure of the sending subsystem corresponding to this invention is shown in FIG. 2, and the corresponding functional units are described as follows.

Dispatch server: implements call control and administration of the right to a trunking call message.

Dispatcher local register: saves registration information and information about the location of the trunking user and group, performs the function of authentication, authorization and responds to the trunking user and performs the function of updating the position and group administration.

Dispatch agent server: supports sessions of the corresponding dispatch consoles and administration consoles, implements administration and maintenance of dispatch consoles and administration consoles for sending with trunking.

Figure 3 is a block diagram of a system showing the registration of a roaming user with the following steps:

(301) a roaming user initiates a request for registration of a trunking service due to registration of power-on or synchronization;

(302) upon receipt of registration request information, the visited PDS sends a trunk registration request to the visited PHR; the visited PHR selects a route based on a user identification code (e.g., IMSI) and forwards the request to the local PHR;

(303) the local PHR updates the user’s position based on the trunk registration request information, returns a trunk registration response to the visited PHR, and the visited PHR returns a response to the visited PDS;

(304) the visited PDS returns trunking service registration information to the user.

4 is a system block diagram showing that a roaming user initiates a private call with the following steps:

(401) a roaming user sends a call by pressing the PTT button (short for Push To Talk (click to speak)), and the mobile station initiates a call request with trunking;

(402) upon receipt of the request, the visited sender PDS sends an authentication request to the visited sender PHR; the visited sender PHR selects a route based on the user identification code and sends an authentication request to the local sender PHR. If the calling user and the called user belong to the same local domain, then steps (403) and (404) will be unnecessary;

(403) the local PHR of the sender finds the location of the called user based on the identification code of the called user and sends an authentication request to the local PHR of the called user;

(404) the local PHR of the called user sends the authentication response of the called user to the local PHR of the sender;

(405) the local sender PHR authenticates and authorizes the sender and the called user, returns an authentication response of the visited sender PHR, the message contains the current location of the called user and the authorization information for the sender, the visited sender PHR returns an authentication response of the visited sender PDS;

(406) upon receipt of an authentication response, the visited PDS of the sender considers the user to be a roaming user, and sends a call setup command to the local PDS of the called user based on the location information of the user and the current location information of the called user returned in the authentication response, to report basic information about this call, such as sender numbers, call connection identification, etc. The current location of the called user may be the local (home) location of the called user, or it may also be the roaming location of the called user;

(407) upon receipt of the call setup command, the local PDS of the called user establishes data areas related to the call and sends an acknowledgment message to the call setup command to the visited sender PDS;

(408) the visited sender PDS paging the sender through the wireless base station;

(409) the sender sends a paging response to the visited PSD of the sender;

(410) the visited PDS of the sender paging the called user through the local PDS of the called user;

(411) the called user sends a paging response to the visited PDS of the sender through the local PDS of the called user;

(412) the sender’s visited PDS grants the right to message to the sender through the wireless base station;

(413) the sender sends a message confirming receipt of the right to the message to the sender visited the PDS, so the sender receives the right to the message and starts talking;

(414) the visited PDS of the sender sends a command indicating that the right to the message has already been granted to the local PDS of the called user to inform that the right to the message is authorized;

(415) the local called user PDS sends a command acknowledgment to the visited PDS.

5 is a block diagram of a system showing that a roaming user initiates a group call, with the following steps:

(501) the roaming user sends a call by pressing the PTT button, the mobile station initiates a call request with trunking;

(502) upon receipt of the request, the visited PDS sends an authentication request to the visited PHR; the visited PHR selects a route based on the user identification code and sends an authentication request to the local PHR;

(503) the local PHR authenticates and authorizes the user and returns an authentication response to the visited PHR, the message containing the IP address of the local PDS and sender authorization information; the visited PHR returns an authentication response to the visited PDS;

(504) upon receipt of an authorization response, the visited PDS considers that the user is a roaming user, and sends, based on the local PDS returned in the authentication response, a group call request sent by the sender to the local PDS, and the participation of an intermediate system PDS may be required with trunking;

(508) the local sending subsystem is designated by the system as a checkpoint for a group call to control the connection of the entire group call, and the local PDS sends an access authentication request to the local PHR;

(506) the local trunking register sends a response message about authentication of access to the local PDS and gives information about all members of the group of this call to the local trunking server;

(507) the local PDS paging the sender through the visited sender PDS and the wireless base station;

(508) the sender sends a paging response to the local PDS via the visited wireless base station and the visited PDS;

(509) the local PDS pagers the other group members of this call;

(510) the called user sends a paging response message to the local PDS;

Explanation: if there is no member of the group other than the sender, who does not roam locally, the procedures of the following steps 511, 512, 513, 514, 517 and 518 will not be necessary.

(511) if there are members of a group other than the sender who is not roaming locally, the local sender trunk server sends a command to establish a call to the visited trunking server of the called roaming user who is not roaming locally to report some basic information about this group call for example, group number, basic information about the sender, identification of call connection with trunking, etc .;

(512) having received a call setup command, the visited roaming user of the called roaming user establishes a data area related to the call, and sends a message confirming receipt of the call setup command to the local sender PDS;

(513) the local sender PDS paging the called user through the visited PDS of the called roaming user and the wireless base station;

(514) the called roaming user sends a paging response to the local sender PDS through the visited base station and visited PDS;

(515) the home PDS grants the right to a message to the sender through the visited sender PDS and the wireless base station;

(516) the sender sends a message confirming receipt of the right to message to the local PDS through the visited wireless base station and the visited PDS, thereby the sender received the right to message and starts talking;

(517) the local PDS sends a command that indicates that the right to the message has been granted to the visited roaming user of the called ros to inform that the right to the message is authorized;

(518) the called user’s visited PDS sends a command acknowledgment to the local sender PDS.

Fig.6 shows a block diagram of a system for administering the right to a message, where Fig.6a is a block diagram showing that the user is applying for a message right in the main parcel management subsystem, Fig.6b is a block diagram 6, showing that the user is applying for the right to a message in the cooperating parcel subsystem, FIG. 6 c is a block diagram showing that the user releases the right to a message in the main parcel management subsystem, FIG. 6-d is a block diagram, showing what good The agent exempts the right to communicate in the cooperating package subsystem. If the type of call is a private call, the local sending subsystem serves as the main sending control subsystem; if the type of call is a group call, the local sending subsystem serves as the main sending control subsystem. Here, the administration procedures for the right to private call and group call are compatible.

For convenience of description, a user located within the main package management subsystem is designated as user A, and a user located within the cooperating package subsystem is defined as user B in the block diagram of the administration system with the right to message.

6-a is a block diagram showing that the user is applying for the right to a message in the main parcel management subsystem, with the following steps:

(6011) User A applies for a message right from the primary PDS manager;

(6012) a) if the right to the message was not granted to another user, steps 6012 and 6013 are not necessary;

b) if the right to the message has already been granted to another user and the priority of the right to message of user A is not higher than the right to priority of the speaking user, user A is added to the queue for applications for the right to message, and the queue procedure for the right to message is performed ;

c) if the right to a message has already been granted to user B and the priority of the right to message from user A is higher than the priority of user B, the PDS general manager sends a command to release the right to the message to the cooperating PDS to inform about the release of the right to user B, and the corresponding PDS informs user B of the release of the right to a message;

(6013) user B informs through the collaborating PDS to the PDS general manager that the release of speaking rights has been completed;

(6014) the PDS general manager sends a command to grant a message right to user A;

(6015) user A sends a confirmation of receipt of authorization of the right to a message to the PDS master manager;

(6016) the PDS general manager informs the collaborating PDS that the right to a message has already been granted to user A;

(6017) the collaborating PDS sends a confirmation message about the entitlement to the PDS general manager.

6-b is a block diagram showing that a user is applying for the right to a message in a collaborative sending subsystem, with the following steps:

(6021) User B applies for granting rights from a collaborating PDS by sending a request for granting rights to a message to the PDS general manager;

(6022) a) if the right to the message was not granted to another user, steps 2022 and 2023 are not necessary;

b) if the right to a message has already been granted to another user and the priority of the right to message from user B is not higher than the priority of the talking user, user B is added to the queue to apply for the right to message, and the queue for the right to message is performed;

c) if the right to a message has already been granted to user A and the priority of this right is higher than that of user B, the PDS general manager will inform user A about the release of the right;

(6023) user A sends a message confirming the release of the right to the message to the main PDS manager;

(6024) the PDS general manager sends a command to authorize rights to user B through the collaborating PDS;

(6025) User B sends the receipt of a message authorization confirmation to the PDS master through a collaborating PDS.

6-c shows that the user releases the right to a message in the main package control subsystem, with the following steps:

(6031) user A sends a request to release the right to the message to the main PDS manager;

(6032) the PDS master sends a message confirming the release of the right to the message to user A;

(6033) the PDS general manager sends a release command to the collaborating PDS;

(6034) The collaborating PDS sends a message confirming the release of the message right to the master PDS.

6-d shows that the user releases the right to a message in the cooperating sending subsystem, with the following steps:

(6041) user B sends a request to release the right to a message to the PDS master manager through a cooperating PDS;

(6042) The PDS master manager sends a message confirming the release of the message right to user B via the cooperating PDS.

Fig.7 shows a block diagram of the release of the call, and Fig.7-a shows that the user releases the call in the collaborating sending subsystem, and Fig.7-b shows that the user releases the call in the collaborating sending subsystem. If the type of call is a private call, the local sending subsystem serves as the main sending control subsystem; if the call type is a group call, the local sending subsystem serves as the main sending control subsystem. Here, the administration procedures for the right to private call and group call are compatible.

7-a shows that the user releases the call in the cooperating sending subsystem, with the following steps:

(7011) the user requests the release of this call from the master PDS;

(7012) the PDS master sends a message confirming the release of the user to the sender;

(7013) PDS general manager releases all users participating in this call within his zone;

(7014) the PDS master manager sends a call release command to the collaborating PDS;

(7015) a collaborating PDS frees all users participating in this call within its coverage area;

(7016) the collaborating PDS sends a message confirming the release of the call to the master PDS.

Fig.7-b shows that the user releases the call in the collaborating sending subsystem, with the following steps:

(7021) a user calls to release this call from the PDS master manager;

(7022) the PDS master manager sends a call release command to the collaborating PDS;

(7023) the collaborating PDS sends a confirmation message about user release to the sender;

(7024) a collaborating PDS frees all users participating in this call in its coverage area;

(7025) the collaborating PDS sends a message confirming the release of the call to the master PDS;

(7026) The PDS general manager frees all users participating in this call in its coverage area.

Fig. 8 shows a block diagram of a voice message forwarding with a trunking call, wherein Fig. 8a is a diagram showing that a voice message is transmitted when the user speaks in the main package control subsystem; and FIG. 8-b is a flowchart showing how a voice message is forwarded when a user speaks in a collaborative sending subsystem. If the type of call is a private call, the local sending subsystem serves as the main sending control subsystem; if the type of call is a group call, the local sending subsystem serves as the main sending control subsystem. Here, private call and group call administration procedures are compatible.

Fig. 8-a is a diagram showing that a voice message is transmitted when the user speaks in the main package control subsystem, with the following corresponding steps

(8011) the user in the main PDS manager receives the right to a message and says the main PDS manager first forwards the packet of voice messages to other users in his service area;

(8012) the PDS master manager sends a voice message packet to other cooperating PDSs;

(8013) a collaborating PDS sends a voice message packet (voice packet) to users in its service area.

FIG. 8-b is a flowchart showing that a voice message is forwarded if the user speaks in a collaborative sending subsystem, with the following corresponding steps:

(8021) a user in a collaborating PDS gains the right to a message and says the collaborating PDS forwards the first packet of voice messages to other users in its service area;

(8022) a collaborating PDS forwards a packet of voice messages to a master PDS;

(8023) the PDS master manager forwards a packet of voice messages to users in his service area and at the same time forwards a packet of voice messages to other collaborating PDSs;

(8024) a collaborating PDS forwards a packet of voice messages to users in its service area.

Due to the above, the present invention provides a method for roaming for a digital communication system with trunking to provide the user with roaming support for various services throughout the network coverage area. This method not only allows full use of the relevant standards of the existing mobile communication system, but also implements the interconnection of systems with trunking in all areas through the control mechanism of the sending subsystem, so that the goal of roaming the terminal trunking service is achieved.

However, it should be understood that the description of the embodiments is relatively specific and should not be construed as limiting the scope of protection of the present invention. And the scope of protection of this invention is covered by the attached claims.

Claims (13)

1. A method of performing roaming for a digital trunking communication system, where the trunking communication system comprises a base station subsystem, a switching subsystem, a sending subsystem and a packet data subsystem, this method providing for the implementation of said roaming controlled by the sending subsystem, a local digital trunking communication system connected with an IP network through the dispatch server and the dispatch local register of its sending subsystem, in such a way as to connect to the system from trunking in another region; wherein said roaming method for a trunking system further includes roaming user registration, a roaming user initiating a private trunking call, a roaming user initiating a trunking group call, administering the right to a message, releasing a call, and forwarding voice messages. 2. The method according to claim 1, characterized in that said roaming user registration process comprises the following steps:
A1) users of the system with trunking accept a unique identifying code, which is laid out uniformly throughout the network and serves as the basis for routing user messages;
b1) when the roaming user is a trunking user, the roaming user initiates the registration of the trunking service position, the sending subsystem of the visited system with trunking gives a route based on information about the user identification code and sends it over the network to the sending subsystem of the local trunking system, which records the latest information about the registered position of the trunking user. 3. The method according to claim 1, characterized in that the process of initiating by this user roaming a private call on the highway includes the following steps:
a2) the roaming user initiates a private call request, the visited sender sending subsystem gives a route based on information about the user identification code and sends an authentication request to the local sender sending subsystem, the local sender sending subsystem performs user authentication;
b2) upon receipt of an authentication response and authorization information returned by the local sender sending subsystem, the visited sender sending subsystem considers that the user is in a roaming state; the sender sending subsystem is designated as a monitoring point for a private roaming call to control the connection procedure of the entire call;
the visited sending subsystem of the sender informs the cooperating sending subsystem of the basic information about this call, the local sending subsystem of the called user sets up a private call in advance to prepare for the next step, namely the establishment of the call;
c2) the called subscriber sending subsystem visited sends paging signals to the sender through the base station and adds the sender to the private call;
d2) the visited sending subsystem of the sender paging the called user through the local sending subsystem of the called user and adding the called user to the private call;
e2) the visited subsystem of the sender provides the right to communicate to the sender;
f2) the visited sending subsystem of the sender sends a command to the local sending subsystem of the called user, which indicates that the right to the message has been granted to indicate that the right to the message has been given to the sender. 4. The method according to claim 3, characterized in that step 2a) further includes the following: the local sending user subsystem participates in the authentication of the called user in case the called user and sender are not in the same region. 5. The method according to claim 1, characterized in that the process of initiating a group call roaming by a user comprises the following steps:
a3) the roaming user initiates a group call request, the sender sending subsystem visited indicates the route based on information about the user identification code and sends an authentication request to the local sending sender subsystem, then the local sending sender subsystem authenticates the user;
b3) upon receipt of an authentication response and authorization information returned by the local sender sending subsystem, the visited sender sending subsystem considers that the user is in a roaming state;
the visited sending subsystem of the sender sends a group call request from the sender to the local sending subsystem of the sender in order to transfer the right to manage the group call to the local sending subsystem of the sender;
c3) the local sending subsystem of the sender becomes a control point for a group call after receiving the right to control the call;
the local sending subsystem again authenticates the call with trunking and receives information about all called users for this group call;
d3) the local sending subsystem sends the paging signals to the sender through the visited sending subsystem and the wireless base station and adds the sender to the group call;
e3) the local sending sender subsystem pages local non-roaming users through the base station and adds these users to the group call;
f3) the local sender sending subsystem provides the right to message to the sender through the visited sender sending subsystem;
g3) the local sending subsystem of the sender sends a command to the local sending subsystem of the called roaming user, which indicates that the right to the message has been granted to indicate that the right to the message has been granted to the sender. 6. The method according to claim 5, characterized in that said method furthermore provides:
e3) if there are some members of the group other than the sender who are not roaming locally, the local sender subsystem further informs the placed roaming user subsystem of the basic information about this call, the visited roaming user subsystem sets the group call in advance to prepare to the next step, namely the establishment of the call, sends a paging signal to the called user through the visited subsystem of the roaming user sending and A wireless base station and adds a roaming user, generating roaming non-locally, the group call. 7. The method according to claim 1, characterized in that the process of said administration of the right to a message involves the following steps:
a4) in case of a private call or a group call in the case when the user initiates a request with a request for the right to message or initiates a request to release the right to a message, the cooperating parcel subsystem sends a request to the main parcel management subsystem for a verdict when the sender is located in the service area of the cooperating subsystem parcels;
b4) when the user initiates a request with a request for the right to message, the main call control subsystem grants the right to message directly to the sender and informs correspondingly sending parcel subsystems that the right to message has already been granted if the right to message has not been granted to other users; the sender is added to the queue for with applications for the right to message, and the queue for the right to message is performed if the right to the message has now been granted to another user, and the priority of the right to message the sender is not higher than the priority of the owner of the right to message; the main parcel management subsystem releases the speaker the right to call, transfers the right to the message to the sender and informs the respective cooperating parcel subsystems that the right to the message is granted if the right to the message is now granted to another user and the priority of the right to the message of the sender is higher than the priority of the owner of the right to the message ;
c4) when the user initiates a request to release the right to a message, the corresponding cooperating parcel subsystem sends a request to the main parcel management subsystem if the sender is located within the cooperating parcel subsystem; the main parcel management subsystem issues a direct verdict on the specified request if the sender is within the main parcel management subsystem;
d4) the main parcel management subsystem releases the right to call and informs the relevant cooperating parcel subsystems about it. 8. The method according to claim 1, characterized in that in the process of releasing the call, the main package management subsystem takes charge of releasing the call. 9. The method according to claim 8, characterized in that the process of releasing the call in the case when the user within the main subsystem of the parcel management initiates the request for releasing the call, provides:
A5) the user initiates the request to release the call, the main parcel management subsystem frees the sender and simultaneously frees other users in his service area;
b5) the main parcel management subsystem informs the relevant cooperating parcel subsystems of the need to release all users participating in this call in their respective service area;
c5) the whole process of releasing the call ends after the corresponding cooperating sending subsystems respond to the main control subsystem with the message that the release is completed. 10. The method according to claim 8, characterized in that the process of releasing the call in case the user initiates a request to release the call within the cooperating sending subsystem, in addition, it assumes:
a6) the user initiates a request to release the call, and the collaborating sending subsystem sends this request to the main package control subsystem;
b6) the main parcel management subsystem informs the relevant cooperating parcel subsystems of the need to release all users participating in this call in their respective service areas;
c6) after the corresponding cooperating parcel subsystems have responded that the release has been completed to the main parcel management subsystem, the main parcel management subsystem releases all users participating in this call in its service area, and the whole process of releasing the call is completed. 11. The method according to claim 1, characterized in that in the process of the specified forwarding of voice messages in case the messages must be forwarded between cooperating dispatch servers, the main managing dispatch server manages the forwarding of voice messages and forwarding of voice messages is not carried out directly between the cooperating dispatch servers . 12. The method according to claim 11, characterized in that the process of sending voice messages, if the user speaks in the main package management subsystem, provides for the following:
A7) the user receives the right to a message and says, the main parcel management subsystem first sends the packet of voice messages to other users in its service area;
b7) the main parcel management subsystem forwards the packet of voice messages to other cooperating parcel subsystems, and the corresponding cooperating subsystems forward the voice packet to users in their service area. 13. The method according to claim 11, characterized in that the process of the specified forwarding of voice messages in case the user speaks on a collaborative sending subsystem provides for the following:
a8) the user learns the right to the message and speaks, and the cooperating sending subsystem first sends the voice message package to other users in its service area and simultaneously sends the voice packet to the main package control subsystem;
b8) the main parcel management subsystem forwards the packet of voice messages to users in its service area and at the same time forwards the voice packet to other cooperating parcel subsystems;
c8) cooperating sending subsystems forward a packet of voice messages to users in their service areas.

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