WO2009000123A1

WO2009000123A1 - Method for a media gateway controller controlling a media gateway preempting circuit source

Info

Publication number: WO2009000123A1
Application number: PCT/CN2007/003830
Authority: WO
Inventors: Dongzi Ning; Hui Cai
Original assignee: Zte Corporation
Priority date: 2007-06-25
Filing date: 2007-12-27
Publication date: 2008-12-31
Also published as: CN101330478A; CN101330478B

Abstract

A method for a media gateway controller controlling a media gateway preempting circuit source includes the following steps that: (a) the preempting control information is carried in a circuit resource adding command transmitted from a media gateway controller MGC to a media gateway MGW; (b) when MGW has found that the circuit resource is repeatedly occupied, it determines whether to preempt the circuit resource according to the preempting control information, and returns a response message to MGC based on the result of adding the circuit. In contrast with the prior art, the preempting method is easy to realize, ensures that a call goes on normally even in the case of that the context data region and the terminal data region between MGC and MGW are not accordant, and cleans up the junk data between MGC and MGW initiatively and in time, thereby the system stability is enhanced.

Description

Method for controlling media gateway to seize circuit resources by media gateway controller

Technical field

The invention relates to a method for controlling a media gateway (MGGW) by a Media Gateway Controller (MGC) in a Next Generation Network (NGN) of a digital mobile communication, and particularly relates to an MGC control MGW circuit resource in an NGN system. Preemption method.

Background technique

International Telecommunication Union International Telecommunication Union - Telecommunication Standards Department (ITU-T, International

Telecommunication Union Telecommunication Standardization Sector ) , responsible for the development and revision of telecommunications standards in the Telecommunications Union. In its H.248 protocol, a system and method for controlling MGW by MGC is defined. The H.248 protocol continuously expands the functionality of the protocol by defining functional packages, and the different functional packages are required for different applications. At present, the H.248 protocol is widely applied to the core of systems such as WCDMA (Wideband Code Division Multiple Access) / CDMA2000 (Code Division Multiple Access 2000) / TD-SCDMA (Time Division 1 Synchronous Code Division Multiple Access) / SOFTSWITCH (Softswitch) network.

According to the H.248 protocol, MGC and MGW are server and client modes, MGC is the server, and MGW is the client. For ordinary calls, the MGC will instruct the MGW to establish a context data area, and then add two terminal data areas in the context data area for characterizing different media bearers and their associated attributes, where the media bearer can be time division multiplexed (TDM). , Time Division Multiplexing ) Circuitry, or other types of carriers. When the MGW and the MGC of different manufacturers are connected, the MGW is responsible for the management of the circuit resource status and the connection between the circuits; and the MGC is responsible for the call signaling negotiation and the TDM circuit resource management, that is, the MGC instructs the MGW to occupy a specific circuit according to the call signaling requirement. To complete the connection between the circuits. In theory, the data between the context data area and the terminal data area between the MGC and the MGW will be synchronized, that is, the current call MGC indicates that the MGW occupies a certain circuit resource, and the current call to the MGC at the end of the call, because the MGC and Communication layer message loss between MGW, MGC or MGW If an internal fault occurs, the data in the context data area and the terminal data area between the MGC and the MGW will not match, and the garbage data in the context data area and the terminal data area will be generated, which will affect the normal progress of subsequent calls. For example, when the MGW fails to release the circuit resources and the corresponding data in the context data area and the terminal data area at the end of the call, the MGW mistakenly considers the circuit when the next call MGC that needs the circuit resource indicates that the MGW occupies the circuit resource. The resource is a duplicate circuit resource, and the MGC "3⁄4 wrong, making the next call fail.

In order to effectively clear the hanged data between the MGC and the MGW, ITU-T defines a functional package H.248.36. In this function package, a periodic timer is defined for each terminal data area of the MGW. Whenever the timer expires, the MGW reports a heartbeat event to the MGC, informing the MGC of its current context information and terminal information. After the MGC receives the heartbeat event, if the context and the terminal information are not available, the MGC can directly send the delete command to clear the context and terminal information hanged in the MGW, or not to respond to the MGW. The MGW deletes the hang-up message when it receives the delete command; or, after the MGW does not receive the MGC response several times, it can delete the hang-up information by itself. In actual applications, in order to reduce the amount of communication layer data between the MGC and the MGW, the heartbeat timer will take a long time. H.248.36 suggests that the heartbeat duration is several times the average talk duration.

When the MGC manages the TDM circuit resources, the above method of H.248.36 causes the garbage data processing between the MGC and the MGW to be untimely, thereby causing the subsequent call to be abnormal. Because the MGW encounters MGC repeated circuit resource add commands during this process, it is common practice to report syntax errors to the MGC. As a result, it is possible to cause some circuits in the call that need to be added in time to be added, which may result in the failure of the call. Since all the information of the TDM circuit resources is managed by the MGC, the MGC knows which circuit resources need to be added during the current call, and the MGW as the client should be able to execute the operation commands of the circuit in full accordance with the latest commands of the MGC, instead of passively Wait until the heartbeat timeout clears the above garbage data before executing the MGC command to add circuit resources.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method for a media gateway controller to control a media gateway to preempt circuit resources, so as to effectively solve the problem between the MGW and the MGC in the H.248 protocol. When the path resource is occupied, the MGW cannot properly add circuit resources to the call in time due to the mismatch between the context data area and the terminal data area data between the MGC and the MGC.

To solve the above technical problem, the present invention provides a method for controlling a media gateway circuit resource preemption by a media gateway controller, including the following steps:

(a) the media gateway controller MGC includes preemption control information in a circuit resource addition command sent to the media gateway MGW;

(b) The MGW determines whether to preempt the circuit resource according to the preemption control information when the circuit resource is repeatedly occupied, and returns a response message to the MGC according to the result of the adding circuit.

Further, the foregoing method further has the following features: In step (a), the MGC sets the preemption control information to preempt the circuit resources or not preempt.

Further, the foregoing method has the following features: In step (a), if the preemption control information is set to preemption, in step (b), the MGW actively preempts the circuit resource, and actively deletes the context data. Data in the zone that is originally associated with the circuit resource, and a response message that adds a correct circuit to the MGC; and if in step (a), the preemption control information is set to not preempt, then in step (b) The MGW returns a response message to the MGC to add an error circuit, indicating that the current call fails.

Further, the foregoing method has the following features: In the step (a), the MGC further adds a request for the MGW to preempt the circuit resource information on the MGC in the circuit resource addition command sent to the MGW; The step (b) further includes the step of the MGW actively preempting the circuit resource and reporting the preemption of the circuit resource information to the MGC.

Further, the foregoing method further has the following feature: the request for the MGW to report the preemption of the circuit resource information to the MGC includes a function package list and additional positioning information for preempting the circuit resource.

Further, the foregoing method further has the following feature: the preemption circuit resource information includes a text ID and a terminal ID.

Further, the foregoing method further has the following features: The method is compatible with the H.248 protocol, and in the step (b), the MGW returns a response message to the MGC by using a notification message of the H.248 protocol. Further, the foregoing method further has the following features: the step (b) further includes: when the MGW does not encounter repeated occupied circuit resources, normally adding corresponding circuit resources, and returning a correct response to the added circuit resources to the MGC. The steps of the message.

Further, the foregoing method has the following features: The circuit resource preemption function of the method can be turned on or off through negotiation between the MGC and the MGW.

By adopting the invention, the call can be guaranteed to be normal when the data of the MGC and the MGW context data area and the terminal data area are inconsistent, and the garbage data appearing between the MGC and the MGW can be actively cleaned in time, thereby enhancing the stability of the system. Sexual drawing overview

FIG. 1 is a flow chart of the MGW being controlled by the MGC and preempting circuit resources in time according to an embodiment of the present invention. Preferred embodiment of the invention

The technical solution of the present invention will be described in more detail below with reference to the accompanying drawings and embodiments.

In order to be compatible with the original method of H.248.36, the present invention extends a method for controlling the media gateway circuit resource preemption by the media gateway controller based on H.248.36, including the following steps: (a) Circuit resources between the MGC and the MGW The preemption control information is included in the add command; (b) according to the preemption control information, the MGW does not report a syntax error to the MGC when the repeated occupied circuit resources are encountered (that is, the added circuit is occupied), and directly preempts the context data. The circuit resources in the zone are then notified to the MGC by using the notification message of the H.248 protocol. In addition, the MGC and the MGW can turn on or off the circuit resource preemption function according to negotiation.

The technical solutions of the present invention are explained and illustrated in detail below with reference to the embodiments and the accompanying drawings. The MGC control MGW circuit resource preemption method described in this embodiment includes the following steps: Step 1: When the MGC sends a circuit resource add command to the MGW, the preemption control information is included in the control parameter, and the parameter of the control information is set to preemption or Not preempting;

The MGC settings request the MGW to actively preempt the sttf attribute of the TDM circuit resource, and if the MGW An ai event that actively reports additional information when TDM circuit resources are preempted internally;

The sttf attribute set by the MGC in the circuit resource add command is defined as follows:

Attribute Name: Actively preempts TDM circuit resources

Genus <!·生标识: sttf

Function Description: Specifies whether the MGW actively preempts TDM circuit resources.

Attribute parameter type: Logic

Attribute parameter value: If there are duplicate circuit resources in the MGW,

- true(OxOOOO): Instructs the MGW to actively preempt the TDM circuit resources;

- false(0x0001): Indicates that the MGW does not actively preempt the TDM circuit resources and returns an error message.

The definition of the ai event attached by the MGC in the circuit resource add command is as follows:

Event name: The MGW actively preempts the TDM circuit resources and reports additional information.

Event ID: ai (0x0001);

Function Description: Defines that the MGW actively preempts the TDM circuit resources and reports additional information. The event exists: Optional.

Step 2: After receiving the circuit resource addition command sent by the MGC, the MGW determines whether there is a duplicate circuit resource, and returns a response to the MGC according to the result of adding the circuit.

If the MGW determines that there is a duplicate circuit resource in the command sent by the MGC, if the parameter of the preemption control information is preemption (the value of the sttf attribute parameter is true), the MGW actively preempts the TDM circuit resource, and deletes the original and the context data area. After the data associated with the circuit resource is executed, step 3 is performed. If the preemption information parameter is not preempted (the value of the sttf attribute parameter is false), the MGW reports an error message to the MGC, indicating that there is already a duplicate circuit resource, and the call fails.

Step 3: After completing the preemption of the circuit resources, the MGW notifies the MGC of the additional information preempted by the circuit resources according to the indication that the MGC reports the additional information (that is, the definition of the ai event in the issued command of the MGC). In step 3, the MGW reports the additional information of the circuit resource preemption to the MGC, including a function package list carrying the preempted resources and additional positioning information.

The additional information parameters that the MGW informs the MGC to preempt the circuit resources are defined as follows:

Parameter Name: Additional Information

Parameter identification: ai (0x0001)

Function Description: Define additional information to report the details of the circuit resources required by the MGC to be preempted and the circuit resources required in the terminal data area.

Parameter type: character type

Parameter mode: Optional. That is, when the MGC has an indication of the additional information (the definition of the ai event) in the issued command, the MGW performs the preemption of the circuit resource, and then notifies the MGC of the additional information of the preempted circuit resource through the ai parameter; and the command issued by the MGC There is no indication that the additional information is reported (the definition of the ai event is not), and the MGW does not have to notify the MGC of the additional information of the preempted circuit resource after performing the preemption of the circuit resource.

The parameter may take values: It is recommended to include a text ID and a terminal ID. Other useful information can also be added to the additional information.

As shown in FIG. 1, the processing flow in the MGW compatible with the H.248 message in this embodiment is shown. The process includes the following steps:

Step 101: The MGW receives a circuit resource addition command sent by the MGC.

Step 102: The MGW determines whether there is a circuit resource that is repeatedly occupied. If yes, go to step 103, if not, go to step 104;

Step 103: Continue to determine if the MGC sets the sttf attribute to preemptible? If yes, go to step 105; if no, go to step 106;

Step 104: The MGW adds corresponding circuit resources, and then performs step 108;

Step 105: The MGW actively preempts the corresponding circuit resources, and then performs step 107;

Step 106: The MGW returns a response to the MGC to add an error circuit, and the process ends. Step 107: This step is optional. If the MGC carries the ai event in the command in step 101, The MGW notifies the MGC of the preempted additional information, otherwise the MGW does not report any information to the MGC. Step 108: The MGW returns a response to add the correct circuit to the MGC using the notification message of the H.248 protocol, and the process ends.

From this flow, steps 1 to 3 of the above method of the present invention can be more clearly understood. In the case of data synchronization between the MGC and MGW context data areas and the terminal data area, or in some other cases, the MGC and the MGW may turn off the circuit resource preemption function by negotiation (e.g., messaging or other means).

The method provided by the invention can be compatible with the original method of H.248.36, and is simple and easy, and in the case that the gram does not match, the use of the relevant circuit resources cannot restore the defects of the normal call in time, and the stability of the system is enhanced.

Industrial applicability

Compared with the prior art, the MGC control MGW circuit resource preemption method provided by the present invention is simple and convenient, and the call can be guaranteed to be normal and active when the data of the MGC and the MGW context data area and the terminal data area are inconsistent. Clean up the garbage data between MGC and MGW in time, thus enhancing the stability of the system.

Claims

Claim

A method for controlling a media gateway circuit resource preemption by a media gateway controller, comprising the steps of:

(b) The MGW determines whether to preempt the circuit resource according to the preemption control information when there is a repeated occupation of the circuit resource, and returns a response message to the MGC according to the result of the adding circuit.

2. The method of claim 1 wherein:

In step (a), the MGC sets the preemption control information to preempt the circuit resources or does not preempt.

3. The method of claim 2, wherein

In step (b), if the preemption control information is set to preemption, in step (b), the MGW actively preempts the circuit resource, and actively deletes data originally associated with the circuit resource in the context data area, And returning a response message to the MGC to add a correct circuit; and if the preemption control information is set to not preempt in step (a), in step (b), the MGW returns an error to the MGC. A response message from the circuit indicating that the call failed.

4. The method of claim 2, wherein

In the step (a), the MGC adds a request for the MGW to report the preemption of the circuit resource information to the MGC in the circuit resource addition command sent to the MGW; and the step of the resource information in the step (b).

5. A method according to claim 4, characterized by a list of functional packages of resources and additional positioning information.

6. The method of claim 4 wherein:

The preemption circuit resource information includes a text ID and a terminal ID.

7. The method of claim 1 wherein:

The method is compatible with the H.248 protocol. In step (b), the MGW returns a response message to the MGC by using a notification message of the H.248 protocol.

8. The method of claim 1 wherein:

The step (b) further includes the step of the MGW normally adding a corresponding circuit resource when the multiplexed circuit resource is not encountered, and returning a response message indicating that the circuit resource is correct to the MGC.

9. The method of claim 1 wherein:

The circuit resource preemption function of the method may be turned on or off by negotiation between the MGC and the MGW.