WO2009086680A1

WO2009086680A1 - Method and system for scheduling access network hairpin connection transaction

Info

Publication number: WO2009086680A1
Application number: PCT/CN2007/003977
Authority: WO
Inventors: Hui Deng; Xiaowen Yu; Danfei Zhu
Original assignee: Zte Corporation
Priority date: 2007-12-29
Filing date: 2007-12-29
Publication date: 2009-07-16
Also published as: CN101803443A; CN101803443B

Abstract

A method and system for scheduling access network hairpin transaction, the method comprises, the hairpin transaction configuring module configuring many terminals that request the hairpin transaction to a hairpin group; the first media descriptor handling module on the receiving side building the TDM resource media descriptor based on the TDM resource scheduling request sent by the sending side and sending it to the second media descriptor handling module on the sending side; the second media descriptor handling module receiving the TDM resource media descriptor and parsing it, sending the parsed TDM resource scheduling request to the TDM resource uniform managing module; the TDM resource uniform managing module searching the TDM resource distribution table after receiving the TDM resource scheduling request, finding the relative information to the TDM resource and scheduling the hairpin transaction based on the relative information.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular, to a hairpin connection (hereinafter referred to as a hairpin) service provisioning method and system for an access network. BACKGROUND In a typical VoIP (voice over Internet Protocol) method, a user terminal accesses a softswitch (SS) according to the H.248 protocol through a media gateway (MG). . When terminals capable of circuit switching under the same media gateway call each other, the terminals are usually equipped with hairpin services, so that these terminals can transmit voice through circuit switching to save real-time transport protocol (hereinafter referred to as Real-time Transport Protocol). Media channel resources for RTP and improve voice quality. A hairpin is a hairpin bend or U-shaped connection that refers to the ability to send a call back in the direction it is coming. However, in a typical VoIP access scheme, terminals under different media gateways are isolated from each other, and even if these terminals can be connected by circuit switching, they cannot be configured with hairpin services. This is because the access network is composed of isolated media gateways. The resources between the media gateways cannot be shared. This is not a true concept of "network", which limits the flexibility of service configuration. SUMMARY OF THE INVENTION Accordingly, the present invention provides a hairpin service provisioning method and system for performing a hairpin service for all circuit-switchable user terminals, which breaks the traditional VoIP access scheme and can only configure the hairpin within the same media gateway. Business restrictions. According to an aspect of the present invention, a hairpin service provisioning method is provided, including the following steps: Step 1: The hairpin service configuration module configures multiple terminals requesting a hairpin service into a hairpin group; Step 2: When transmitting the side receiving side When the time division multiplexing (TDM) resource allocation request is sent, the first media descriptor processing module on the receiving side constructs the TDM resource media descriptor according to the TDM resource allocation request and sends it to the second media descriptor processing module on the transmitting side; Step 3: When receiving the TDM resource media descriptor, the second media descriptor processing module parses the TDM resource media descriptor, and sends the parsed TDM resource allocation request to the TDM resource unified management module; and step 4 After receiving the TDM resource allocation request, the TDM resource system A management module searches the TDM resource allocation table to find related information of the TDM resource, and allocates the hairpin service according to the related information. In the first step, the following processing is also performed: configuring a hairpin service configuration table for the hairpin group, where the hairpin service configuration table includes at least the ID (identification) of the terminal and the ID of the hairpin group. The TDM resource allocation request is at least a TDM resource allocation request or a TDM resource release request. The transmitting side and the receiving side are respectively an access network side and a soft switching side. In addition, in step four, the following processing is also performed: When the deployment of the hairpin service fails, normal VoIP service provisioning is performed. According to another aspect of the present invention, a hairpin service provisioning system is provided, including: a hairpin service configuration module, located on a softswitch side, configured to configure a plurality of terminals requesting a hairpin service to a hairpin group; a descriptor processing module, located on the softswitch side, configured to: when the access network side sends a TDM resource provisioning request to the softswitch side, construct a TDM resource media descriptor and send the TDM resource media descriptor to the second media descriptor. a processing module, where the second media descriptor processing module is located on the access network side, configured to parse the TDM resource media descriptor when the TDM resource media descriptor is received, and send the parsed TDM resource allocation request to the TDM The unified management module of the resource and the unified management module of the TDM resource are located on the access network side, and are configured to search the TDM resource allocation table after receiving the TDM resource allocation request, thereby finding related information of the TDM resource, and then according to the related information. Hairpin business is deployed. The TDM resource allocation request includes at least: a TDM resource allocation request and a TDM resource release request. The hairpin service configuration module is further configured to configure a hairpin service configuration table for the hairpin group, where the hairpin service configuration table includes at least the ID of the terminal and the ID of the hairpin group. In addition, the TDM resource unified management module is also used to perform normal VoIP service deployment when the deployment of the hairpin service fails. Therefore, the present invention provides a resource and device view of the entire network in the whole network access solution, that is, the resources in the entire access network are uniformly managed, and the monthly access to multiple nodes in the same access network The disadvantage that the resources cannot be shared, so that all resources in the entire access network can be uniformly deployed, and the hairpin service can be configured for any terminal that is reachable through circuit switching. Other features and advantages of the present invention will be set forth in the description which follows, and in part It will become apparent in the specification or may be understood by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the <RTI The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart of a hairpin service provisioning method according to the present invention; FIG. 2 is a schematic diagram of a hairpin service call setup signaling procedure according to a first embodiment of the present invention; A schematic diagram of a hairpin service call release signaling procedure of an embodiment; and FIG. 4 is a block diagram of a hairpin service provisioning system of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention are described with reference to the accompanying drawings. It should be understood that in the present invention, the terminal involved substantially requires a terminal configured to be a hairpin service and circuit-switched. 1 is a flow chart of a hairpin service deployment method according to the present invention. As shown in FIG. 1, the method includes the following steps: Step S102: The hairpin service configuration module configures multiple terminals that request the hairpin service to a hairpin group. Step S104: When the sending side sends a TDM resource allocation request to the receiving side, the receiving The first media descriptor processing module of the side constructs the TDM resource media descriptor according to the TDM resource allocation request and sends it to the second media descriptor processing module of the sending side; Step S106, when receiving the TDM resource media descriptor, The second media descriptor processing module parses the TDM resource media descriptor, and sends the parsed TDM resource allocation request The TDM resource unified management module is provided; and in step S108, after receiving the TDM resource allocation request, the TDM resource unified management module searches the TDM resource allocation table to find related information of the TDM resource, and allocates the hairpin service according to the related information. In step S102, the following processing is further performed: configuring a hairpin service configuration table for the hairpin group, wherein the hairpin service configuration table includes at least the ID of the terminal and the ID of the hairpin group. The TDM resource allocation request is at least a TDM resource allocation request or a TDM resource release request. The transmitting side and the receiving side are respectively an access network side and a soft switching side. When the access network side sends a TDM resource allocation request to the softswitch side, the following processing is performed in step S104: the first media descriptor processing module resides in the TDM resource allocation request to construct the TDM resource media descriptor and sends it to the second Media descriptor processing module. When receiving the TDM resource media descriptor, the second media descriptor processing module parses the TDM resource media descriptor, and sends the parsed TDM resource allocation request to the TDM resource unified management module. After receiving the TDM resource allocation request, the TDM resource unified management module searches the TDM resource allocation table to find related information of the TDM resource, and allocates the hairpin service according to the related information. The first media descriptor processing module is a softswitch side media descriptor processing module, and the second media descriptor processing module is an access network side media descriptor processing module. When the access network side sends a TDM resource release request to the softswitch side, the following process is performed in step S104: The first media descriptor processing module constructs the TDM resource media descriptor according to the TDM resource release request and sends it to the first Two media descriptor processing modules. Then, when receiving the TDM resource media descriptor, the second media descriptor processing module parses the TDM resource media descriptor, and sends the parsed TDM resource release request to the TDM resource unified management module. Next, after receiving the TDM resource release request, the TDM resource unified management module searches the TDM resource allocation table to find related information of the TDM resource, and releases the hairpin service according to the related information. The first media descriptor processing module is a softswitch side media descriptor processing module, and the second media descriptor processing module is an access network side media descriptor processing module. In addition, in step S108, the following processing is also performed: When the deployment of the hairpin service fails, the normal VoIP service deployment is performed. It should be understood that the flow of implementing the hairpin service is substantially the same as the standard flow of a normal VoIP call, and a preferred embodiment of the present invention will be described next with reference to FIGS. 2 and 3. First Embodiment FIG. 2 is a schematic diagram of a hairpin service call setup signaling procedure according to a first embodiment of the present invention. As shown in FIG. 2, the method includes the following steps: Processing S202, after receiving the calling dialing message, the SS queries the hairpin service configuration module for the hairpin service configuration state of the calling user and the called user, where, if the calling party is If the call is configured with the hairpin service and belongs to the same hairpin group, the query result returns the hairpin group ID. Otherwise, the hairpin service fails, and the normal VoIP service can be tried. In S204, the access network receives the allocated TDM resource of the SS. After the signaling indication of the media channel, the TDM resource unified management module applies for allocating TDM resources, where the TDM resource unified management module first finds the TDM group ID available for the permanent endpoint in the context, and then queries the TDM resource allocation table. ", find a "TDM resource number" with the same resource ID as the TDM group ID, and the "Resource status" is "Idle", return the "TDM resource number" of the TDM resource record, and change the "Resource Status" If it is "occupied", if the TDM resource allocation fails, the hairpin service fails, and the normal VoIP service can be tried; and S206 is processed to divide the called user. TDM resources, this step is basically the same as step S204 described above, the detailed description thereof will be omitted. Second Embodiment FIG. 3 is a schematic diagram of a hairpin service call release signaling procedure according to a second embodiment of the present invention. As shown in FIG. 3, the method includes the following steps: Processing S302: After receiving the signaling indication of the media channel for releasing the TDM resource of the SS, the access network notifies the TDM resource to be released to the unified management module of the TDM resource, and the TDM resource is uniformly managed. The module queries the record of the TDM resource to be released in the "TDM resource allocation table", and The source state is modified to "idle"; and the process S304 is to release the TDM resource for the called user, the step is substantially the same as the above step S302, and a detailed description thereof is omitted. FIG. 4 is a hairpin service provisioning system 400 according to the present invention. As shown in FIG. 4, the system includes: a hairpin service configuration module 402, located on a softswitch side, configured to configure multiple terminals requesting a hairpin service to a hairpin group; a first media descriptor processing module 404, located in the soft The switching side is configured to: when the access network side sends the TDM resource allocation request to the softswitch side, construct the TDM resource media descriptor according to the TDM resource allocation request and send the TDM resource media descriptor to the second media descriptor processing module; a processing module 406, located on the access network side, configured to parse the TDM resource media descriptor when the TDM resource media descriptor is received, and send the parsed TDM resource allocation request to the TDM resource unified management module; The TDM resource unified management module 408 is located at the access network side, and is configured to search for a TDM resource allocation table after receiving the TDM resource allocation request. The information about the TDM resource is found, and the hairpin service is configured according to the related information. The first media descriptor processing module 404 is a softswitch side media descriptor processing module, and the second media descriptor processing module 406 is an access network. Side media descriptor processing module.

The TDM resource allocation request includes at least: a TDM resource allocation request and a TDM resource release request. The hairpin service configuration module 402 is further configured to configure a hairpin service configuration table for the hairpin group, where the hairpin service configuration table includes at least the ID of the terminal and the ID of the hairpin group. In addition, the TDM resource unified management module 408 is further configured to perform normal VoIP service deployment when the deployment of the hairpin service fails. Specifically, in the hairpin service configuration module 402, the hairpin service can be configured only between two terminals that are reachable through circuit switching. The hairpin service configuration module 402 configures the user who needs to be configured as a hairpin service and has circuit-switched reach to a hairpin group. In this way, the purpose of the #text is to find that when a user calls other users in the same hairpin group, the access network can be instructed to select TDM resources for call connection. Thus, it should be appreciated that the hairpin service configuration module 402 is configured to perform hairpin group configuration for the hairpin user on the SS. Configure users who are reachable on the access network side to a hairpin group In, each hairpin group has a unique number for the hairpin group ID. After the configuration is completed, a hairpin service configuration table is generated. Each item in the table contains "user ID" and "hairpin group ID", and the format is as follows:

User ID hairpin group ID This hairpin service configuration table is used to retrieve the "hairpin group ID" based on the "user ID". When the calling party and the called party belong to the same hairpin group, the call between them can be connected using the hairpin. In addition, the interface between the SS and the access network is an H.248 interface. When the access network needs to be instructed to select a TDM resource for a call connection, the format of the media descriptor is different from the format of the media descriptor of the RTP stream, and a new format needs to be defined. The media descriptor of the new format is described by the SS side media. The token processing module 404 is constructed. When the access network selects a TDM resource for the calling party to notify the SS through the H.248, the SS side media descriptor processing module 404 also parses the media descriptor of the TDM resource. Specifically, the SS side media descriptor processing module 404 is configured to perform H.248 protocol packing and parsing of the TDM resource media descriptor for the hairpin service on the SS side, and the module can be used as the H.248 protocol processing module on the SS (not shown) ) a part of. Because the TFM resource is used as the media channel when the hairpin connection is made, it is different from the RTP stream when it is a temporary termination. It needs "local and remote" in the "stream descriptor" of this type of endpoint. Descriptor (Local & Remote) is extended by adding a m-line description to distinguish it from the usual media, and adding a description of the a line to specify the hairpin group. The extension of the description of the m line in the preferred embodiment is as follows:

The extension of the a row of the preferred embodiment is shown in the following table:

The interface between the access network and the SS is also an H.248 interface. When the TDM resource is selected as the media channel according to the instruction of the SS, the selected TDM resource needs to be notified to the SS through the media descriptor. Then, the SS notifies the opposite end of the call, and then needs to access the network side media descriptor processing module 406 to construct the TDM resource media descriptor. When the called end is designated as the media channel of the calling party, the network side media descriptor processing module 406 is also required to perform the parsing of the TDM resource media descriptor. Specifically, the access network side media descriptor processing module 406 is configured to perform H.248 protocol packing and parsing of the TDM resource media descriptor for the hairpin service on the access network side, and the module may serve as a service processing module of the access network ( Part of the figure not shown). The extension of the media descriptor by this module 406 is the same as the SS side media descriptor processing module 404. In the TDM resource unified management module 408, all TDM resources on the access network side are uniformly numbered and uniformly allocated and released. This allows the TDM number to be identified and the TDM connection to be made regardless of whether the user in the same hairpin group is connected to the SS through the same H.248 interface.

The TDM resource unified management module 408 is configured to manage the TDM resources of the entire network of the access network, and all the allocation and release of the TDM resources are completed by the module. This module 408 maintains a "TDM Resource Allocation Table". Each item in the table contains "TDM Resource Number", "Affiliated Hairpin Group ID", "Resource Location" and "Resource Status". The format is as follows:

The "TDM resource number" is a unique number of a TDM resource in the entire network on the access network side, and each TDM resource on the access network side has a "TDM resource number". The group ID of the resource belongs to the number of a group to which the TDM belongs. The TDM timeslots belonging to the same group can be connected to each other. The "group ID of the resource belongs" can be associated with the "hairpin group ID" configured on the SS. . The "resource location" is the physical location of the TDM resource, and the operation instruction is sent to the device where the TDM resource is located. The "resource status" is the current state of the TDM resource, and the status value can be "idle" or "occupied". In summary, the present invention implements a hairpin service based on full network access. As long as the two user terminals in the access network are circuit-switched, the hairpin services of the two user terminals can be implemented on the basis of unified management of the entire network TDM resources. This can greatly save RTP port resources and improve the quality of voice services on the same network. Moreover, the hairpin service can be flexibly configured according to the circuit switch accessibility of the access network, breaking the limitation that the hairpin clerk can only carry out within one access node, and adding new resources to the existing access network. (such as TDM resources), the existing business capabilities of the access network can be well extended. The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

An access network hairpin connection service provisioning method, configured to allocate all TDM resources in an access network and allocate a hairpin connection service for multiple terminals reachable through circuit switching, and is characterized in that The following steps:

Step 1: The hairpin connection service configuration module configures the multiple terminals that request the hairpin connection service to a hairpin connection group.

Step 2: When the transmitting side sends the time division multiplexing resource allocation request to the receiving side, the first media descriptor processing module of the receiving side constructs the time division multiplexing resource media descriptor according to the time division multiplexing resource allocation request and Sending it to the second media descriptor processing module of the transmitting side;

Step 3: When receiving the time division multiplexing resource media descriptor, the second media descriptor processing module parses the time division multiplexing resource media descriptor, and parses the time division multiplexing resource The scheduling request is sent to the time division multiplexing resource unified management module; and step 4, after receiving the time division multiplexing resource allocation request, the time division multiplexing resource unified management module searches the time division multiplexing resource allocation table, thereby finding the Time-division multiplexing related information, and arranging the hairpin connection service according to the related information.

2. The method according to claim 1, wherein in the step 1, the following processing is further performed:

Configuring a hairpin connection service configuration table for the hairpin connection group,

The hairpin connection service configuration table includes at least an identifier ID of the terminal and an ID of the hairpin connection group.

The method according to claim 1, wherein the time division multiplexing resource allocation request is at least a time division multiplexing resource allocation request or a time division multiplexing resource release request.

The method according to claim 3, wherein the transmitting side and the receiving side are an access network side and a soft switching side, respectively.

5. The method according to claim 1, wherein in the step four, the following processing is further performed:

When the deployment of the hairpin connection service fails, the normal VoIP service deployment is performed.

An access network hairpin connection service provisioning system, configured to allocate all time division multiplexing resources in an access network and allocate a hairpin connection industry for a plurality of terminals reachable through circuit switching, The method includes: a hairpin connection service configuration module, located on a softswitch side, configured to configure the multiple terminals that request the hairpin connection service to a hairpin connection group;

The first media descriptor processing module is configured to be located on the softswitch side, and configured to configure the time division multiplexing resource media description according to the time division multiplexing resource allocation request when the access network side sends the time division multiplexing resource allocation request to the softswitch side. And sending the second media descriptor processing module to the second media descriptor processing module, where the second media descriptor processing module is located on the access network side, when receiving the time division multiplexed resource media descriptor, Decoding the time division multiplexing resource media descriptor, and transmitting the parsed time division multiplexing resource allocation request to the time division multiplexing resource unified management module;

The time division multiplexing resource unified management module is located at the access network side, and is configured to: after receiving the time division multiplexing resource allocation request, find a time division multiplexing resource allocation table, thereby finding the time division multiplexing resource. Related information, and the hairpin connection service is deployed according to the related information.

The system according to claim 6, wherein the time division multiplexing resource allocation request includes at least: a time division multiplexing resource allocation request and a time division multiplexing resource release request.

The system according to claim 6, wherein the hairpin connection service configuration module is further configured to configure a hairpin connection service configuration table for the hairpin connection group,

The hairpin connection service configuration table includes at least an ID of the terminal and an ID of the hairlink connection group.

The system according to claim 6, wherein the time division multiplexing resource unified management module is further configured to perform normal VoIP service adjustment when the deployment of the hairpin connection service fails.