CN1567775A - A method for implementing channel establishment by call between packet networks - Google Patents

Abstract

The invention discloses a method for realizing the establishment of a bearer channel between packet networks. The method presets packet network information including packet network identification items, configuration information in a media gateway controller (MGC) and a media gateway (MGW); if the MGC The calling party and called party corresponding to the received user call information belong to different packet networks in the same MGW, and the MGC obtains the identification information of the packet network from the configuration information of the MGC according to the office direction information of the calling party and the called party. The network information generates an add endpoint message including the packet network identification information and sends it to the corresponding packet network; after receiving the add endpoint message, the MGW obtains the packet network identification information from the message, and adds the endpoint corresponding to the packet network corresponding to the identification information, and establish connections between endpoints. The scheme of the invention realizes the intercommunication between IP and IP and between ATM and ATM under the control of the same MGW, increases the flexibility of NGN system networking, and enriches the service content of the NGN system.

Description

A method for establishing a call bearer channel between packet networks

technical field

The invention relates to a technology for establishing a call bearer channel between a wideband code division multiple access (WCDMA) R4 system and a packet network in a next-generation network (NGN), and more precisely relates to a method for realizing the establishment of a call bearer channel between a packet network.

Background technique

In the WCDMA R4 system and NGN system, the bearing and control functions of the switching equipment in the core network are separated, that is, the original switching equipment is separated into a media gateway controller (MGC) and a media gateway (MGW). The MGC implements the call control function, and the MGW implements the Bearer control and bearer interaction functions, the bearer media supported by the MGW are Time Division Multiplexing (TDM), Asynchronous Transfer Mode (ATM) or IP domain. MGC controls MGW through H.248 agreement, among them ATM and IP belong to grouping network.

Taking the WCDMA R4 system as an example, Figure 1 shows the separation structure of the WCDMA R4 system, in which the MGC 101 is the GMSC Server or MSC Server, and the two MGW 102 are MGW1 and MGW2, which are under the unified control of the MGC 101. The interface between them is the Mc interface, and the communication protocol is the media gateway control protocol (H.248), that is, the MGC controls the MGW to establish a voice or data bearer through a message provided by the H.248 protocol.

If MGW1 and MGW2 are controlled by the same MGC, when User1 of MGW1 needs to communicate with User2 of MGW2, the processing flow of the WCDMA R4 system is shown in Figure 2, corresponding to the following steps:

Steps 201-203: After receiving the call from User1, the MGC selects the gateway MGW1 on the User1 side, and notifies the MGW1 to add the ingress point T1 on the User1 side. After adding T1, the MGW1 returns confirmation information to the MGC.

Steps 204-205: MGC selects gateway MGW1 on the User1 side, and notifies MGW1 to add an outgoing endpoint T2 connected to MGW2. After adding T2, MGW1 automatically sets T1 and T2 as connected, and returns a confirmation message to MGC.

Steps 206-208, MGC calls user User2, selects gateway MGW2 on User2 side, and notifies MGW2 to add ingress point T3 connected to MGW1, after adding T3, MGW2 returns confirmation information to MGC, and sets T2 and T3 as connected state.

Steps 209-210, MGC selects gateway MGW2 on User2 side, and notifies MGW2 to add egress point T4 on User2 side. After adding T4, MGW2 sets T3 and T4 to connected state, and returns confirmation information to MGC.

Through the above settings, users User1 and User2 can establish a connection relationship through these four endpoints.

In the process of adding an endpoint, for the bearer media TDM, when adding an endpoint through the message provided by the H.248 protocol, the MGC can indicate the identifier corresponding to the endpoint. The identifier is unique in the MGW corresponding to the TDM, and the MGW can The circuit where the endpoint in the TDM is located is determined according to the identifier, that is, the office direction information. However, for the endpoints in IP and ATM, the MGC cannot describe the identity of the network where the endpoint is located, so the MGW cannot set corresponding endpoints for different IP bearer media or different ATM bearer media it controls.

Take IP as the bearer medium as an example. Referring to Figure 3, two independent IP networks with unified addressing, that is, IP domains belong to two different owners, and these two IP domains cannot directly communicate with each other, and must be connected through the MGW. In this networking application, if a user in IP domain 1 needs to establish a connection with a user in IP domain 2, the MGC needs to control the MGW to add two endpoints, that is, the MGW adds the outgoing endpoint corresponding to IP domain 1 and the corresponding IP domain 2 The ingress endpoints of , and the bearer channel is established through these two endpoints. However, the current H.248 protocol does not define how to add an endpoint corresponding to a specific IP domain on the MGW, so the intercommunication between the two IP domains cannot be realized.

To sum up, the current MGC cannot control the MGW to establish call bearer channels between IP and IP, ATM and ATM bearer media under the MGW, that is, it is impossible to establish IP and IP users under the same MGW, and ATM and ATM bearer channels. Calls between users.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for establishing call bearer channels between packet networks.

In order to achieve the above object, the technical solution of the present invention is achieved in this way: a method for realizing the establishment of a bearer channel between packet networks, the method comprising the following steps:

a. Preset the packet network information containing the packet network identifier item, the media gateway controller (MGC) at least includes the configuration information of the corresponding relationship between the packet network where the user is located and the packet network identifier, and the media gateway (MGW) includes at least the packet network identifier , Configuration information of packet network resource information;

b. After the MGC receives the user call information, it judges whether the calling party and the called party corresponding to the user's call information belong to different domains of the same packet network in the same MGW. Obtain the packet network identification information from the configuration information of the MGC, and generate an add endpoint message including the packet network identification information according to the packet network information set in step a, and send it to the MGW, and then enter step c, otherwise, end this processing flow ;

c. After the MGW receives two additional endpoint messages corresponding to the calling side packet network and the called side packet network, it obtains the packet network identification information of the calling side packet network and the called side packet network from the messages, and in the MGW Add the endpoints corresponding to the packet network on the calling side and the called side, and establish connections between the endpoints.

In the step a, based on the media gateway control protocol (H.248), the packet network information is set as a packet used to identify the packet network identifier stipulated by the H.248 protocol.

The method may further include, setting the name and identification of the package, the setting package includes at least attribute information, the attribute information includes the group network identification, and the group network identification includes attribute identification, type identification, existence location and feature information, setting the attribute The attribute identifier in the information is netid, the type is enumeration, the location is LocalControl descriptor, and the characteristic is Read.

When generating the add endpoint message in the step b, set the packet network identification information in the add endpoint message according to the location information in the packet.

In the step a, the preset packet network information is the attribute type information extended in the SDP protocol for setting the packet network identification information.

When the add endpoint message is generated in step b, the packet network identification information is set in the SDP protocol part of the Local descriptor in the add endpoint message.

In the step a, the configuration information of the MGW includes the default packet network domain information, in the step b, the add endpoint message generated by the MGC does not include the packet network identification information, then in the step c, the MGW adds the corresponding The endpoint of the default packet network.

The packet network is an IP network or an ATM network.

The method may further include,

d. After the MGC receives the user call end message, it generates a delete endpoint message including packet network identification information and endpoint information to be deleted, and sends it to the MGW;

e. After receiving the delete endpoint message, the MGW deletes the endpoint in the MGW corresponding to the packet network corresponding to the identification information stored in the delete endpoint message.

In the step a, the configuration information of the MGW includes the default packet network domain information, in the step d, the delete endpoint message generated by the MGC does not include the packet network identification information, then in the step e, the MGW deletes the corresponding The endpoint of the default packet network.

The scheme of the present invention realizes the intercommunication between the IP network and the IP network and between the ATM network and the ATM network under the control of the same MGW by extending the H.248 protocol or the SDP protocol, and increases the flexibility of the NGN system networking, Enrich the business content of the NGN system.

Description of drawings

Figure 1 is a schematic diagram of the separation structure of the WCDMA R4 system;

Fig. 2 is the flow chart of realizing user communication in different networks under MGC by WCDMA R4 system in the prior art;

FIG. 3 is a schematic diagram of two IP domains connected through one MGW;

Fig. 4 is a flow chart of the solution of the present invention in which the MGC controls the MGW to realize IP domain-to-IP domain communication.

Detailed ways

The scheme of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The solutions of the present invention mainly relate to two types of packet networks, IP and ATM, in the bearer media controlled by the MGW, and there are two specific solutions.

A solution of the present invention is to first define a packet according to the H.248 protocol, which is used to define the packet network identifier, and is used to indicate the MGW to increase when communicating in the IP-to-IP network or ATM-to-ATM network under the same MGW. The packet network to which the endpoint belongs.

Set a name and identifier for the defined package, for example, define the package name as an intercommunication package of the same packet network, and set the package identifier as iptoip or atmtoatm. This bag has the fixed format that H.248 agreement stipulates, should have attribute, event, signal, statistics and process description in the bag that H.248 agreement stipulates, the event in the bag that the scheme of the present invention provides, statistics and process All descriptions can be empty, that is, the package includes at least attribute information. Set the attribute information in the package as the packet network identifier, which includes attribute identifier, type identifier, possible value, existence location and characteristics. For example, you can set the attribute identifier as netid, since the identifier of the packet network is described by an integer, So you can set Type to Enum, Possible Value to Null, Exists to LocalControl Descriptor, and Characteristic to Read.

Since the added endpoint message stipulated by the H.248 protocol includes the part of describing the media attribute by the SDP protocol, another solution of the present invention is to extend the SDP protocol, and extend the attribute used to describe the packet network identifier in the SDP protocol. For example, in the SDP protocol, the netid is extended as the packet network identifier, so the SDP protocol can be used to add "a=netid:N" in the add endpoint message specified in the H.248 protocol to describe the media attributes, where "a=" is The attribute description method specified by the SDP protocol, ":" is the separator specified by the SDP protocol, and "N" is the specific value of the packet network identifier, which can be any integer value.

The above two setting schemes are to pre-set the packet network information. The difference between the two schemes is that when the H.248 protocol is extended, the packet network identifier is encapsulated in the extension packet of the LocalControl descriptor in the endpoint message; for SDP When the protocol is extended, the packet network identifier is encapsulated in the SDP protocol part in the Local descriptor of the added endpoint message.

In order to make the MGC send the add endpoint message to the MGW, the MGW can add the endpoint of the packet network corresponding to the packet network identifier in the MGW according to the packet network identifier therein, and configuration information needs to be set for the MGC and the MGW. Specifically, the corresponding relationship between the packet network where the user is located and the packet network identifier needs to be set for the MGC, and the identifier of each packet network controlled by the MGW, resource information including information such as the address and port number of each packet network, and Is there a default grouping network.

After the above settings, the MGC can control the MGW to implement communication from IP domain to IP domain, or from ATM domain to ATM domain. One MGW shown in Figure 3 is used to connect two IP domains, and its business process is shown in Figure 4. The communication between users in the two IP domains is realized through the following steps:

Step 401: After receiving a call message from User1 in IP domain 1 calling User2 in IP domain 2, the MGC judges whether the bearer media of User1 and User2 are under the same MGW control according to the information of calling User1 and called User2 Two IP networks, if yes, go to the next step, otherwise, follow the existing call flow.

In step 402, the MGC generates an add endpoint message notifying the MGW to add an endpoint corresponding to the IP domain 1 corresponding to the calling User1, and sends the message to the MGW.

The MGC first obtains the IP identifier corresponding to the IP domain 1 from the configuration information saved by the MGC according to the IP domain 1 of the packet network where the user User1 is located. In the intercommunication packet of the packet network, the IP identification information is encapsulated in the extension packet adding the LocalControl descriptor of the endpoint message. If the identification of this package is iptoip, the attribute identification in this package is netid, and this IP identification information is 1, then the information encapsulated in the extension package of LocalControl descriptor is " iptoip/netid=1 "; If adopt pair of SDP agreement For an extended solution, the MGC encapsulates the IP identification information in the SDP protocol part in the Local descriptor of the added endpoint message.

Step 403: After receiving the message of adding an endpoint from the MGC, the MGW sets the endpoint corresponding to IP domain 1 in the MGW, and returns a response message of successful setting to the MGC.

After receiving the message of adding an endpoint sent by the MGC, the MGW learns that an endpoint needs to be added by analyzing the content of the message. If the identification information of IP domain 1 is stored in the message, the identification information is obtained from the message, and the IP domain 1 corresponding to the identification information is allocated in the MGW according to the resource information of the IP domain stored in the configuration information. Otherwise, the MGW adds an endpoint corresponding to the default IP domain in the configuration information to the MGW according to the resource information of the IP domain saved in the configuration information.

Step 404: After receiving the response message returned by the MGW, the MGC generates an add endpoint message instructing the MGW to add an endpoint corresponding to the IP domain 2 corresponding to the called User2, and sends it to the MGW.

The process of generating the add endpoint message in this step is the same as the process of generating the add endpoint message in step 402 .

Step 405 , after the MGW receives the message of adding an endpoint, the MGW adds an endpoint corresponding to the IP domain 2 corresponding to User2, connects the two set endpoints, and returns a response message of successful setting to the MGC.

The process of adding endpoints in IP domain 2 by the MGW is the same as adding endpoints in IP domain 1.

Steps 406-407: After receiving the response message, the MGC notifies the calling User1 and the called User2 that the voice channel has been established.

After the call between the calling User1 and the called User2 ends, the MGC needs to notify the MGW to delete the established endpoints corresponding to the two IP domains. Similar to the establishment of the endpoints, the MGC adds the identification information of the IP domain in the delete endpoint message, and also needs to add For the endpoint information of the IP domain, the MGW deletes the endpoint corresponding to the IP domain in the MGW after receiving the delete endpoint message from the MGC. If there is no identification information of the IP domain in the delete endpoint message, the MGW obtains the default IP domain from its stored configuration information, and deletes the endpoint corresponding to the IP domain in the MGW according to the endpoint information in the delete endpoint message.

Claims (10)

1, a kind of method that realizes that bearer path is set up between packet network is characterized in that this method may further comprise the steps:

A. set in advance the packet network information that comprises the packet network identification item, at least the configuration information that comprises user place packet network and packet network sign corresponding relation in the Media Gateway Controller (MGC), and comprise at least in the media gateway (MGW) that packet network identifies, the configuration information of packet network resources information;

After b.MGC receives customer call information, judge the caller and the called not same area that whether belongs to packet network of the same race among the same MGW of this customer call information correspondence, if, then the packet network according to caller and called subscriber place obtains the packet network identification information from the configuration information of MGC, and generate according to the packet network information that is provided with among the step a and to comprise the increase end points message of this packet network identification information, and send to MGW, enter step c afterwards, otherwise, finish this handling process;

After c.MGW receives two increase end points message of corresponding Calling Side packet network and callee side packet network, from this message, obtain the packet network identification information of Calling Side packet network and callee side packet network, in MGW, increase Calling Side and the pairing end points of callee side packet network, and set up the connection between end points.

2, method according to claim 1 is characterized in that among the described step a, based on MGCP (H.248) with the bag that be used for identification packet network identity of packet network information setting for the regulation of agreement H.248.

3, method according to claim 2, it is characterized in that this method further comprises, the title and the sign of bag are set, bag is set comprises attribute information at least, described attribute information comprises the packet network sign, comprises attribute-bit, type identification, location and characteristic information in the described packet network sign, attribute-bit in the information that sets a property is netid, type is for enumerating, and the location is the LocalControl descriptor, is characterized as Read.

4, method according to claim 2 is characterized in that, generates among the described step b when increasing end points message, in increasing end points message the packet network identification information is set according to the location information in the bag.

5, method according to claim 1 is characterized in that among the described step a, sets in advance packet network information and is used to be provided with the attribute type information of packet network identification information for expansion in the SDP agreement.

6, method according to claim 5 is characterized in that, generates among the described step b when increasing end points message, and the SDP protocol section of Local descriptor is provided with the packet network identification information in increasing end points message.

7, method according to claim 1, it is characterized in that among the described step a, the configuration information of described MGW comprises the packet network domain information of acquiescence, do not comprise the packet network identification information in the increase end points message that described step b MGC generates, among the then described step c, MGW increases the end points of corresponding default packet network therein.

8, method according to claim 1 is characterized in that, described packet network is IP network or atm network.

9, method according to claim 1 is characterized in that this method further comprises,

After d.MGC receives the user's communication end, generate the deletion end points message that comprises the packet network identification information and will delete terminal point information, and send to MGW;

After e.MGW receives deletion end points message, delete the identification information preserved with deletion end points message among this MGW the corresponding end points of corresponding packet network.

10, method according to claim 9, it is characterized in that among the described step a, the configuration information of described MGW comprises the packet network domain information of acquiescence, do not comprise the packet network identification information in the deletion end points message that described steps d MGC generates, among the then described step e, the end points of corresponding default packet network among the MGW deletion MGW.

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