CN1154300C - Method for supporting part of routing for integral service digital network user of multiple medium gateway - Google Patents

Abstract

A method for partial routing of ISDN users supporting multiple media gateways, pre-configuring a corresponding relationship table between a base station controller/radio network controller and the direct route from the gateway mobile switching center to the relevant media gateway, the gateway The mobile switching center judges the mobile switching center server where the user is located, and the mobile switching center server finds the base station controller/radio network controller where the user is currently located, so as to find the direct route from the gateway mobile switching center to the relevant media gateway, and the gateway The mobile switching center distributes the circuit identification code to the directly connected media gateway, and the mobile switching center server controls and completes the routing connection. It enables the gateway mobile switching center to directly select the route to the media gateway in the user's area, avoiding unreachable situations and wasting system resources.

Description

Method for User Partial Routing in ISDN Supporting Multiple Media Gateways

technical field

The invention relates to the field of third-generation mobile communication, especially in the third-generation mobile communication, a method for a mobile switching center server MSC server to support ISUP routing of multiple media gateways MGW's ISUP.

Background technique

Let us start with the third generation of mobile communications. The third generation of mobile communication has generally gone through the development of R99, R4, and R5 standards. Among them, R99 was proposed in 1999, and R4 and R5 were proposed in 2000 and 2001, respectively. The present invention is actually an improvement on the R4 standard communication network. The characteristic of this R4 standard mobile network is that its bearer and control are separated. That is to say, the business flow that actually bears the business and the control flow that controls the business flow are carried out separately. In Figure 1, the thick line represents the specific actual business flow, and the dotted line represents a control flow. As can be seen in the figure, for this kind of network, the service control is mainly carried out through a mobile switching center server MSC server, which controls the services of the following media gateway MGW and other equipment. Two media gateways MGW are shown in the middle of Fig. 1 . The media gateway MGW refers to a gateway that can not only transmit voice services, but also transmit services such as images and data.

Since users on ISDN need to communicate with users on the mobile network, the public land mobile network PLMN must communicate with the ISDN, and ISDN data must enter the mobile network through A gateway mobile switching center GMSC. In this way, in order to realize intercommunication, an effective route must be established between the media gateway MGW and the gateway mobile switching center GMSC, and the establishment of the above route is controlled by the mobile switching center server MSC server. If the mobile switching center server MSC server only controls a media gateway MGW, the process is relatively simple:

(1) The gateway mobile switching center GMSC distributes the circuit identification code CIC to the media gateway MGW, and then sends the initial address message IAM containing the circuit identification code CIC to the mobile switching center server MSC server.

The above-mentioned initial address message IAM is a message in the ISUP routing protocol of the user part of the integrated services digital network. It is a message sent when initially establishing a connection, and the circuit identification code CIC is a code in the initial address message IAM. Which gateway to assign to means that the gateway is selected as the gateway we want to send, and the actual data is sent to the gateway.

(2) The mobile switching center server MSC server controls the media gateway MGW to complete the routing connection with the gateway mobile switching center GMSC.

However, with the development of the third-generation mobile communication and the needs of actual networking, the situation that the MSC server only controls one media gateway MGW is less and less. In many cases, the MSC server does not To control multiple media gateways MGW. The procedure for this case is as follows:

(1) The gateway mobile switching center GMSC allocates the circuit identification code CIC to one of the multiple media gateways MGW, and selects the data to be sent to the media gateway MGW. The media gateway MGW is not necessarily the media gateway MGW in the area where the user is located. , because the network service and control are separated, and the control cannot be performed when sending data, and the media gateway MGW to which the data is sent is completely random, as shown in Figure 1. Assuming that the user is in the area described by the media gateway 1, the best path should be sent to the media gateway 1 by the gateway mobile switching center GMSC, but it is actually sent to the media gateway 2. Then send the initial address message IAM containing the circuit identification code CIC to the mobile switching center server MSCserver.

(2) The mobile switching center server MSC server judges whether the route sent by the gateway mobile switching center GMSC is the best path, if it is judged not, for example, in the above example, the initial address message IAM sent by the GMSC to the mobile switching center server MSC server The identification code CIC corresponds to a certain trunk circuit in GMSC and media gateway 2, and there may be two situations:

The first case is that if there is no bearer connection between the media gateway 1 and the media gateway 2, the called user is unreachable at this time;

The second case is that if there is a bearer connection between the media gateway 1 and the media gateway 2, then the mobile switching center server MSC server needs to allocate a bearer connection port between the media gateway 1 and the media gateway 2 for each call of this type, and then the MG2 establishes a bearer connection to MG1. In this case, the occupied amount of bearer terminal and network switching resources is twice that of the GMSC direct route selection to the media gateway MGW1.

The disadvantage of the prior art is: if there is no bearer connection between the optimal media gateway and the actually arrived media gateway, the called user is unreachable at this time; even if there is a bearer connection, there is a waste of bearer terminal and network. The problem of exchanging resources.

Contents of the invention

The purpose of the present invention is to provide a method for partial routing of ISDN users supporting multiple media gateways, which can enable the gateway mobile switching center GMSC to directly select the route to the media gateway in the area where the user is located, avoiding unreachable and wasting system resources Case.

To achieve the above object, the solution of the present invention is: a method for partial routing of ISDN users supporting a plurality of media gateways, in a network separated from bearer and control, a mobile switching center server MSC server controls multiple The media gateway MGW, the mobile switching center server MSC server and the gateway mobile switching center GMSC between the traditional integrated services digital network and the mobile network support ISUP signaling for the user part of the integrated services digital network,

a, in the mobile switching center server MSC server, pre-configure a base station controller BSC/radio network controller RNC and the corresponding relationship table of the direct route between the gateway mobile switching center GMSC and the relevant media gateway MGW;

B, the gateway mobile switching center GMSC judges the mobile switching center server MSC server where the user is located, and gets the roaming number MSRN of the called user to the mobile switching center server MSC server;

c, the mobile switching center server MSC server searches the location area/community information recorded by the user when registering the location, and finds out the base station controller BSC/radio network controller RNC where the user currently resides);

d. The mobile switching center server MSC server searches the above-mentioned pre-configured correspondence table according to the base station controller BSC/radio network controller RNC where the user is currently located, and finds the relationship between the gateway mobile switching center GMSC and the relevant media gateway MGW Include the routing number in the roaming number MSRN and send it to the gateway mobile switching center GMSC;

e. The gateway mobile switching center GMSC receives the above-mentioned roaming number MSRN, takes out the routing number, distributes the circuit identification code CIC to the media gateway MGW corresponding to the routing number, and then sends the initial address message IAM containing the circuit identification code CIC to the mobile Switching center server MSC server;

f. The mobile switching center server MSC server controls the media gateway MGW corresponding to the routing number to complete the routing connection with the gateway mobile switching center GMSC.

In step c, if the mobile switching center server MSC server searches for the location area/community information recorded by the user during location registration, if it does not find it, it sends a pre-paging to all the base station controllers BSC/radio network controller RNC under its jurisdiction , the base station controller BSC/radio network controller RNC under its jurisdiction responds to whether the user is within the range of the base station controller BSC/radio network controller RNC, and the mobile switching center server MSC server judges the current location of the user according to the response base station controller BSC/radio network controller RNC.

In step c, the number of the mobile switching center MSC and a temporary subscriber number stored in the visitor location register VLR are first put into the roaming number MSRN by a visitor location register VLR, and then the described routing number Put it in the roaming number MSRN and send it to the gateway mobile switching center GMSC; in step e, the gateway mobile switching center GMSC receives the roaming number MSRN, first takes out the number of the mobile switching center MSC, and determines which mobile switching center the user belongs to, Then take out the route number, and distribute the circuit identification code CIC to the media gateway MGW corresponding to the route number.

In step c, such a scheme can be adopted: the last nibble Digit of the roaming number MSRN is allocated to store the routing number, and the routing number is sent in the last nibble Digit; in step e, the gateway The mobile switching center GMSC takes the routing number from this last nibble Digit.

In step c, such a scheme can also be adopted: add the nibble Digit after the normal roaming number MSRN to store the routing number specially, and send the routing number in the added nibble Digit; in step e , the gateway mobile switching center GMSC takes out the routing number from the added nibble Digit.

Because the present invention pre-configures a correspondence relation table of a base station controller/radio network controller and the corresponding best direct route in the mobile switching center server, and then according to the situation of the base station controller/radio network controller where the user currently resides After finding the best direct route and the media gateway in the user's area, the gateway mobile switching center directly distributes the circuit identification code to the media gateway in the user's area, so that the gateway mobile switching center directly selects a route to the media gateway in the user's area. Avoid unreachable and wasteful system resource situations.

Description of drawings

Fig. 1 is a schematic diagram of the routing of the user part of the ISDN in which the server of the mobile switching center supports the media gateway.

Fig. 2 is a flow chart of the method of the present invention.

best practice

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Fig. 2 is a flow chart of the method of the present invention. In the figure, we can clearly see the realization process of the present invention. Each step of the process roughly corresponds to the subheadings we follow.

(1) In the mobile switching center server MSC server, pre-configure a corresponding relationship table of the base station controller BSC/radio network controller RNC and the direct route from the gateway mobile switching center GMSC to the relevant media gateway MGW.

When to configure the correspondence table between the base station controller BSC and the direct route, and when to configure the correspondence table between the radio network controller RNC and the direct route? Generally, for the case of GSM, we configure the correspondence table between the base station controller BSC and the direct route; for the case of WCDMA, the radio network controller RNC is equivalent to the function of the GSM base station controller BSC, and we configure the radio network controller RNC and Correspondence table of the through route.

Generally speaking, there is a one-to-one correspondence between the base station controller BSC/radio network controller RNC and the media gateway MGW. If we know which base station controller BSC/radio network controller RNC is under the jurisdiction of the user's area, There is only one media gateway MGW corresponding to this area. We have determined the media gateway in the area where the user is located, and can configure a base station controller BSC/radio network controller RNC and a gateway mobile switching center GMSC to the relevant media gateway according to this relationship. Correspondence table of through routes between MGWs.

(2) The gateway mobile switching center GMSC judges the mobile switching center server MSC server where the user is located, and obtains the roaming number MSRN of the called user from the mobile switching center server MSC server.

The gateway mobile switching center GMSC judges the mobile switching center server MSC server where the user is located by searching the home location register HLR. The Home Location Register (HLR) is a relatively important register of the public mobile communication network, which stores all user data and the current location of the mobile station in the local area. In this example, we only need the information of the mobile switching center server MSC server where the user is registered.

The roaming number is a temporary number set in order to complete the purpose of the present invention. After the gateway mobile switching center GMSC asks for the number, how to configure the number at the mobile switching center server MSCserver end will be described in detail in the following steps.

(3) The mobile switching center server MSC server searches the location area/community information recorded by the user when the location is registered, and finds the base station controller BSC/radio network controller RNC where the user is currently located.

The information of the base station controller BSC/radio network controller RNC where the user is located is pre-registered in the mobile switching center server MSC server, and the mobile switching center server MSC server can be searched at any time according to this information, but it may not be found Condition. This is because the mobile switching center server MSC server restarts and other reasons. Once the mobile switching center server MSC server restarts, the pre-registered information will be lost. If the mobile switching center server MSC server searches for the location area/cell information recorded by the user during location registration, if it does not find it, it sends a pre-paging to all the base station controllers BSC/radio network controller RNC under its jurisdiction, and the base stations under its jurisdiction The controller BSC/radio network controller RNC responds to whether the user is within the range of the base station controller BSC/radio network controller RNC, and the mobile switching center server MSC server judges the base station controller BSC where the user is currently located according to the response /Radio Network Controller RNC.

(4) The mobile switching center server MSC server searches the above-mentioned pre-configured correspondence table according to the base station controller BSC/radio network controller RNC where the user is currently located, and finds the link between the gateway mobile switching center GMSC and the relevant media gateway MGW. For the direct route between them, include the routing number in the roaming number MSRN and send it to the gateway mobile switching center GMSC.

In this step, the number of the mobile switching center MSC and a temporary subscriber number stored in the visitor location register VLR are first put in the roaming number MSRN by a visitor location register VLR, and then the described routing number Put it into the roaming number MSRN and send it to the gateway mobile switching center GMSC. There are many choices for where the routing number is placed in the roaming number MSRN. There are two common methods: one is to allocate the last nibble Digit of the roaming number MSRN to store the routing number, and put the routing number in the Send in the last nibble Digit; the other is to add the nibble Digit after the normal roaming number MSRN to store the routing number, and send the routing number in the added nibble Digit.

Suppose we take the latter approach. Under normal circumstances, the roaming number MSRN allocated to users does not contain routing numbers, such as:

86139M1M2M300N1N2N3N4

Among them, M1M2M3 is the MSC number, N1N2N3N4 is the temporary subscriber number in the VLR,

After including the routing number, the above roaming number MSRN assigned to the user becomes:

86139M1M2M300N1N2N3N4K1

The above K1 is used as the relative number of the media gateway MGW corresponding to the current roaming position of the called user in all media gateways MGW (1 Digit is enough to meet the needs). A consensus is reached between adjacent GMSCs/PSTNs.

For example, suppose the above roaming number MSRN is 861394560012341, then the MSC number is 456, the temporary subscriber number in the VLR is 1234, and the routing number is 1, that is to say, the media gateway MGW corresponding to the current roaming location of the called subscriber is in The relative number in all media gateways MGW is 1.

(5) The gateway mobile switching center GMSC receives the above-mentioned roaming number MSRN, takes out the routing number, distributes the circuit identification code CIC to the media gateway MGW corresponding to the routing number, and then sends the initial address message IAM containing the circuit identification code CIC to Mobile switching center server MSC server.

Suppose we adopt the first method in the above method of putting the routing number in the roaming number MSRN, then the gateway mobile switching center GMSC takes out the routing number from the last nibble Digit; if the second method is adopted, the gateway mobile switching center The central GMSC takes the routing number from the added nibble Digit.

(6) The mobile switching center server MSC server controls the media gateway MGW corresponding to the routing number to complete the routing connection with the gateway mobile switching center GMSC. This part is a process in the prior art, so it will not be described in detail.

Claims (6)

1. A method for partial routing of ISDN users supporting multiple media gateways. In a network where bearer and control are separated, a mobile switching center server MSC server controls multiple media gateways MGW, and a mobile switching center server MSC server Support the ISUP signaling of the user part of the integrated services digital network between the gateway mobile switching center GMSC located between the traditional integrated services digital network and the mobile network, a, in the mobile switching center server MSC server, pre-configure a base station controller BSC/radio network controller RNC and the corresponding relationship table of the direct route between the gateway mobile switching center GMSC and the relevant media gateway MGW; B, the gateway mobile switching center GMSC judges the mobile switching center server MSC server where the user is located, and gets the roaming number MSRN of the called user to the mobile switching center server MSC server; c. The mobile switching center server MSC server searches for the location area/community information recorded by the user during location registration, and finds the base station controller BSC/radio network controller RNC where the user is currently located; d. The mobile switching center server MSC server searches the above-mentioned pre-configured correspondence table according to the base station controller BSC/radio network controller RNC where the user is currently located, and finds the relationship between the gateway mobile switching center GMSC and the relevant media gateway MGW Include the routing number in the roaming number MSRN and send it to the gateway mobile switching center GMSC; e. The gateway mobile switching center GMSC receives the above-mentioned roaming number MSRN, takes out the routing number, distributes the circuit identification code CIC to the media gateway MGW corresponding to the routing number, and then sends the initial address message IAM containing the circuit identification code CIC to the mobile Switching center server MSC server; f. The mobile switching center server MSC server controls the media gateway MGW corresponding to the routing number to complete the routing connection with the gateway mobile switching center GMSC. 2. The method for partial routing of ISDN users supporting a plurality of media gateways according to claim 1 is characterized in that: in step b, the gateway mobile switching center GMSC judges the location of the mobile switching center server MSC server where the user is located The method is by searching the home location register HLR, the information of the mobile switching center server MSC server where the user is registered is recorded in the home location register HLR. 3. The method for partial routing of ISDN users supporting a plurality of media gateways according to claim 1, characterized in that: in step c, the mobile switching center server MSC server searches for the location area recorded by the user when registering the location If no cell information is found, a pre-paging is sent to all subordinate base station controllers BSC/radio network controller RNC, and the subordinate base station controller BSC/radio network controller RNC controls whether the user is in the base station The mobile switching center server MSC server determines the base station controller BSC/radio network controller RNC where the user is currently located according to the response. 4, according to claim 1, the method for the ISDN user partial routing of a plurality of media gateways described in support of 2 or 3, it is characterized in that: in step d, move switching center by a visitor location register VLR The number of MSC and a temporary subscriber number stored in the visitor location register VLR are first put into the roaming number MSRN, then the described routing number is put into the roaming number MSRN, and sent to the gateway mobile switching center GMSC; in step In e, the gateway mobile switching center GMSC receives the roaming number MSRN, first takes out the number of the mobile switching center MSC, judges which mobile switching center the user belongs to, and then takes out the routing number, and makes a circuit to the media gateway MGW corresponding to the routing number Identification code CIC assignment. 5. The method for partial routing of ISDN users supporting multiple media gateways according to claim 4, characterized in that: in step d, the last nibble Digit of the roaming number MSRN is allocated as storage The routing number is sent by putting the routing number in the last nibble Digit; in step e, the gateway mobile switching center GMSC takes out the routing number from the last nibble Digit. 6. The method for partial routing of ISDN users supporting multiple media gateways according to claim 4, characterized in that: in step d, the normal roaming number MSRN is followed by a nibble Digit, which is specially stored Routing number, put the routing number in the added nibble Digit to send; in step e, the gateway mobile switching center GMSC takes out the routing number from the added nibble Digit.