Method for realizing route based on position in digital trunked call

0001FIELD OF THE INVENTION The present invention relates to the field of digital trunking communications, and in particular to a cluster terminal call dispatcher technology. BACKGROUND OF THE INVENTION Mobile communication technology has been developed to the third generation, and cluster communication has increasingly become an indispensable communication service. Cluster communication refers to a dedicated scheduling communication method, including dedicated command and dispatch communication. In use, cluster users can join calls at the same time, and the call works in simple mode. Broadly speaking, various wireless communication systems with scheduled communication functions, including wireless intercom systems, can be included in the scope of trunked communication systems. The cluster communication has experienced a single intercom system (one pair of talks) to a single base station small system (in the same frequency simplex network form, different frequency single (double) work network form, single ^ f words and one call form, With the choice of call form, multi-channel automatic dialing), to the development of large-capacity multi-zone systems (multi-channel user sharing), and then experienced a leap from analog cluster to digital cluster, this leap makes cluster communication in the letter More reliable digital processing methods can be used for coding, multiple access methods, speech coding, modem technology, synchronization techniques, error detection and error correction, and diversity techniques. The two widely used digital trunking systems are iDEN (Integrated Digital Enhanced Network) and TETRA (Terestrial Trunked Radio) based on TDMA multiple access technology, in order to promote the scale application of digital trunking systems, and further improve the frequency resource utilization, cluster communication. The system has a new application trend in application, which is to combine multiple digital cluster systems for unified use and management, so as to achieve the purpose of sharing channels and channels, sharing coverage areas, communication services, and sharing costs. The cluster application has evolved from targeting individual professional users to implementing common network operations for multiple group users. The development of trunking communication from the private network to the common network has promoted the research on cluster technology on the existing public network (GSM, CDMA). When a cluster terminal in the digital trunking communication field calls the dispatching station, when the cluster user dials a special number (generally a dispatching station number or a call processing center), the system determines the route of the target address according to the location information of the calling user. E.g, Dispatchers in different regions share the same dispatching station number, and the dispatching authority between dispatchers is divided according to the location area. When the user calls the dispatching station, the system selects the corresponding dispatcher to access according to the location area of ​​the calling party. Conveniently allocate resources and improve call processing. When an existing cluster terminal calls the dispatching station, it generally limits the number of users that can be called in or out according to the location area, the cell or the area i or the latitude and longitude of the terminal. Related patents such as JS6724882, CN03157508 and CN03148343, etc. These patents have a common feature, which needs to be judged on the MSC side to establish a mapping relationship between the location area and the number filtering directory. Taking CN03157508 as an example, it introduces a mobile switching system in the wireless scheduling system. At the center's visited mobile switching center (GMSC/VMSC), the correspondence between the dispatcher's terminal number and the regionally distributed V1SC/VL number and its dispatching area and the cell number distributed in the VMSC is established. When a call is initiated, arbitration is performed here to implement the dispatcher call restriction method. The prior art generally requires the cooperation of a positioning system (GPS), a mobile switching center (MSC) or a packet switching service node (PDSN) to establish a correspondence between a local path and a transmission area number (LATA). SUMMARY OF THE INVENTION The technical problem to be solved by the present invention is that, in view of the problems existing in the prior art, a method for implementing a cluster terminal to call a dispatching station in different areas by means of a device of the cluster system itself is proposed. The invention package "^ the following steps:

00021. 1 Divide the scheduling area (cell, area or dispatch location area) within the network coverage as needed;

00031. 2 Distributing the dispatcher subordinate to the dispatching station according to the jurisdictional location area, establishing a correspondence between the dispatching station/dispatcher/location area, and storing the corresponding relationship in the PHR;

00041. 3 When the terminal calls the dispatching station, the PHR (scheduling home register) analyzes that the called party is the dispatching station. After the authentication is passed, the PDS (scheduling server) sends a paging called dispatching station command to the DAS (the dispatching station server), and the paging command is sent. The location information of the calling party is carried in; the dispatching station selects a specific dispatcher to complete the call. In the above solution, the DAS ^^ finds the available dispatcher according to the location information of the calling user, and if there is a dispatcher available, notifies the dispatcher of the call request; if no dispatcher is available, the default dispatcher is paged; The dispatcher responds to the page, the call is successfully established; the dispatcher does not respond, and the call is rejected. The conditions of the available dispatcher are: The dispatcher currently has an operational dispatcher, the dispatcher's jurisdiction includes the location area where the caller is located, and the dispatcher has the authority to schedule the caller. When there are multiple available dispatchers, the first call is established, and the other is automatically canceled. The location information of the calling party in the present invention may be a physical cell, a region, or a logical scheduling location area. The difference between the present invention and the prior art is that instead of restricting the call, the call is directed to the dispatcher of the nearest service, and a plurality of dispatchers share a unified dispatching station number. When the user dials in a different geographical location, the system automatically Access to the nearest dispatcher, which makes it easy to provision resources and handle call problems. It can be realized only by relying on the equipment of the cluster system itself. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a basic network architecture of a digital trunking communication system; FIG. 2 is an exemplary diagram of a scheduling location area; and FIG. 3 is a flow chart of a cluster user call scheduling station of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings: Figure 1 shows the network structure of the digital cluster. The components are described as follows:

0005MS: A cluster terminal, which can support terminal devices for storing user information, group information, scheduling location area judgment, and responding to paging and other cluster services;

0006BSS: base station subsystem, including a transceiver supporting a trunked call (BTS), a base station controller (BSC), and a scheduling client (PDC) that interacts with the network side;

0007PDS: scheduling server, implementing call control and call rights management functions for trunk calls;

0008PHR: Scheduling the home register, storing the registration information and location information of the cluster users and groups, including the mapping relationship between the dispatcher/dispatcher/location area, realizing the authentication, authorization and charging functions of the cluster users, and the location Update and group management functions;

0009PHR Agent: The receiving station can directly manage the group, group and user, such as assigning authority; DAS: dispatching station server, processing the service request sent by the dispatching station client;

0010DAC: The dispatcher client, including the dispatching station and the management station. The dispatching station performs scheduling operations by the dispatcher, including initiating calls, querying status, recording, etc.; the management station performs management operations such as group division and user authority by the administrator; The location-based routing of the dispatcher and dispatcher is set at the management station. Figure 2 is an example of a scheduling location area, as explained below:

0011DLA: Dispatch Location Area The location area is a logical 4, which consists of one or more cells. The operator divides the coverage network of the system into several scheduling location areas according to the actual needs of the network planning. The invention firstly plans a location area according to system scheduling requirements, and the location area can be divided according to the principle of a cell, a region or a scheduling location area. The scheduling location area is a logical concept, and the minimum unit is a cell or a collection of multiple cells. Taking FIG. 2 as an example, the DLA 200 is a set of the cell 201, the cell 202, and the cell 203. The invention proposes a logical scheduling location area, which is more in line with the cluster system service features. In order to limit the serviceable range of the cluster service, one or more scheduling location areas may be further configured to constitute a scheduling service area. The present invention divides the dispatcher subordinate to the dispatching station according to the jurisdictional location area, establishes a mapping relationship between the dispatching station/dispatcher/location area, and saves the corresponding relationship in the PHR; FIG. 3 is a cluster user of the present invention. Call dispatcher flow chart. Divide the scheduling area (cell, area, or dispatch location area) within the network coverage as needed, And the dispatcher subordinate to the dispatching station divides according to the jurisdictional location area, establishes a correspondence relationship between the dispatching station/dispatcher I location area, and saves the corresponding relationship in the PHR, when the cluster terminal calls the adjustment degree station The steps are as follows:

0012301 : The cluster terminal initiates a call to the dispatching station;

0013302: The PDS sends an Access-Request message to the PHR to request the primary/called user to authenticate. The PHR analyzes that the called party is the dispatching station. After the authentication is passed, the PDS sends a call dispatching station command to the DAS, and the command carries the information about the calling position.

0014303: The DAS further determines whether the dispatcher has a qualified dispatcher, and the judgment condition is: the current dispatcher has an operable dispatcher; the dispatcher can schedule the location area to include the location area where the caller is located, and schedule The clerk has the authority to schedule the user. These conditions are met at the same time as qualified dispatchers.

0015304: If there is a dispatcher that satisfies the condition, the DAS notifies the paging message to all dispatchers that satisfy the condition. Since there may be more than one dispatcher satisfying the condition at the same time, the system takes all notifications, one dispatcher responds first, and the other dispatchers automatically cancel the principle of answering authority.

0016305: If there is no dispatcher that satisfies the condition, the DAS notifies the default dispatcher of the paging message.

0017306: If the dispatcher responds to the paging request before the response timer expires, the call setup is successful. If the dispatcher answers the timeout and rejects the answer, the call fails.