WO2006125356A1

WO2006125356A1 - A system and method for isdn access in the next generation network (ngn)

Info

Publication number: WO2006125356A1
Application number: PCT/CN2006/000271
Authority: WO
Inventors: Ming Lin; Haiyin Ma
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-05-21
Filing date: 2006-02-24
Publication date: 2006-11-30
Also published as: MY138789A; CN1867010A

Abstract

A system and method for the large capacitance ISDN access in NGN enable the number of the SCTP connections of the media gateway controller to be reduced and the process efficiency to be improved. In the present invention, the separate IUA signaling agent point is added in the network and is used for the convergence and conversion of the IUA signaling. The IUA signaling on the SCTP connections connected to a large quantity of the media gateways is convergent to the small quantity of SCTP connections connected to the media gateway controller. The function of the media gateway controller is simulated for the media gateway and the function of the media gateway that provides large amount of ISDN interfaces is simulated for the media gateway controller.

Description

ISDN access system and method in next generation network

TECHNICAL FIELD The present invention relates to next generation network technologies, and more particularly to ISDN access technologies in next generation networks.

Background technique

Integrated Services Digital Network ("ISDN") is a digital telecommunications network that combines digital transmission and digital switching to provide users with multiple services on a pair of telephone lines, including voice and non-voice. Kind of business.

Currently widely used in China is the "Narrowband Integrated Services Digital Network" (N-ISDN), which can realize end-to-end digital connection based on 64kbit/s rate, and can provide users with two standard access services:

The first type is Basic Rate Access (BRA), which can provide 2B + D rate, where B is a 64kbit/s digital channel, which can be used to transmit digital services, and D is 16kbit/s. The signaling digital channel can be used to transmit various control signals; for example, it can be used to transmit low-speed telemetry signals and packet-switched data information. 2B + D provides a total bandwidth of 144kbit/s. Users who use BRA can use a variety of services such as telephone, fax, viewable text, and data communication on a pair of ordinary telephone lines. Up to 8 terminals can be connected, and 3 terminals can be used at the same time. Therefore, it is called "one line pass".

The second is a Primary Rate Access (PRA), which provides a rate of 30B + D, where both B and D are 64kbit/s digital channels.

The link layer of the ISD protocol is based on the Q.921 protocol. The network layer is based on the Q.931 protocol.

Traditional end-to-end voice services are usually provided by circuit switched networks, such as the Public Switched Telephone Network (PSTN) and the Public Lands Mobile Network (PLMN); and multimedia data. Services are usually provided by packet-switched networks, such as the Internet Protocol ("IP") network. With the development of communication technology, it is gradually becoming possible to carry all services together on a single data network. Use the data network to uniformly carry voice services and data services, The video business will bring revolutionary changes to operators. This convergence trend is driving different types of businesses, different technologies, and different applications. The Next Generation Network ("NGN") was proposed in this case and has been rapidly developed in recent years.

The definition of NGN given by ITU-T in February 2004 is: NGN is a packet network that provides multiple services including telecommunication services, and can utilize multiple bandwidths and quality of service (Quality of Service, The transmission technology referred to as "QoS" is the separation of business functions from the underlying transport technology. It allows users to freely access different service provider networks and supports universal mobility to achieve user consistency and uniformity in service usage. Sex.

With the development of network technology, the telecommunication network is gradually integrated into the NGN architecture, and the ISDN service also needs to be provided in the NGN network. The standard networking for providing ISDN services on an NGN network is shown in Figure 1. After the media gateway (Media Gateway, referred to as "MG") processes Q.921, the Q.931 message is transmitted to the media gateway controller through the IUA (ISDN Q. 921 - User Adaptation, referred to as "service,"). Ler, referred to as "MGC" for short, the media gateway controller performs ISD signaling service processing, and then controls the media resources on the media gateway to conduct a call through the media gateway control protocol (H.248/MGCP).

Integrated Services Digital Network Q. The user interface of the 921 user is shown in Figure 2.区别 Differentiate an ISDN access line on a media gateway by using an interface ID. Multiple interfaces can form an application server (Apps), and an AS can have multiple application server processes. (ASP), the application server process (ASP) is based on the Stream Control Transmission Protocol ("SCTP") connection. SCTP is a further development of the User Datagram Protocol (UDP) and Transmission Control Protocol (TCP) protocols used for the transmission of current signaling information over IP networks. It enhances UDP traffic and provides reliable delivery of datagrams; it also overcomes some of the limitations of the TCP protocol. The SCTP protocol can run on packet networks (such as IP networks) that cannot reliably transmit datagrams, enabling reliable transmission of datagrams.

The signaling on the ISDN access line on the media gateway can be transmitted to the media gateway controller over one or more flow control transport protocol connections. The IUA part of the media gateway is called the Signaling Gateway ("SG," for short), and the IUA part of the Media Gateway Controller is called Do the application server process ASP. The application server process ASP can be called an IUA link, and the IUA AS can be called an IUA link set.

Media gateways can be divided into access gateways and residential gateways. The access gateway provides a large number of ISDN subscriber lines, which are usually installed at the central office; the residential gateway is installed at the user's home, providing a small number of ISDN subscriber lines for home use. With the development of broadband access technology, home broadband access is becoming more and more common, and the number of residential gateways will increase. Under the residential gateway application model, each residential gateway needs to establish an SCTP link for the media gateway controller, and the media gateway controller needs to support a large number of SCTP links, since each SCTP link of the residential gateway is usually on Without traffic, the effective utilization rate is low, and the main processing capability of the media gateway controller should be used to process the service. Therefore, managing and maintaining a large number of low-utilization SCTP links greatly reduces the processing efficiency of the media gateway controller.

Summary of the invention

In view of this, the main object of the present invention is to provide an ISDN access system and method in a next generation network, which can improve the processing efficiency of the media gateway controller.

To achieve the above object, the present invention provides a high-capacity ISDN access system in a next-generation network, including a media gateway controller and a plurality of media gateways controlled by the media gateway control protocol, and a signaling agent point, respectively The ΙϋΑ link is connected to the media gateway and the media gateway controller, and is configured to aggregate an IUA link with each of the media gateways to an IUA link with the media gateway controller, and The IUA signaling conversion is performed between the media gateway controller and the media gateway.

The sum of the number of IUA links between the signaling proxy point and each of the media gateways is greater than the number of ΙϋΑ links between the signaling proxy point and the media gateway controller.

In addition, the signaling proxy point includes:

The first module is connected to each of the media gateways through an IP interface, and is used to interact with the analog media gateway controller and each of the media gateways;

a second module, connected to the media gateway controller by using an IP interface, configured to interact with the analog media gateway and the media gateway controller, where the simulated ISDN line accessed by the media gateway is connected to the signaling proxy point a collection of ISDN lines accessed by all media gateways;

a node interworking function module, configured to perform independently allocated ISDN lines on each of the media gateways The mutual mapping between the road interface identifier and the ISDN line interface identifier uniformly assigned by the signaling proxy point, and the transition of the IUA link or link set state on both sides.

In addition, in the node interworking function module, the transition of the IUA link or link set state on both sides includes:

The IUA link interrupt event between the signaling proxy point and the media gateway is converted to a Q.921 split link indication and reported to the media gateway controller.

Transmitting an interrupt event of the IUA link between the signaling proxy point and the media gateway controller into a Q.921 split request to be sent to the media gateway, or actively disassembling the flow control transport protocol connection with the media gateway .

The present invention also provides a high-capacity ISDN access method in a next-generation network, which is applied to the system described above, and the method includes at least the following steps:

When the signaling agent point receives the message from the media gateway, the analog media gateway controller processes the message;

The signaling proxy point converts the ISDN line interface identifier in the message to an ISDN line interface identifier uniformly allocated by the signaling agent point;

The signaling proxy point simulates a media gateway, and sends a message that has been converted to the interface identifier to the media gateway controller.

When the signaling proxy point receives the message from the media gateway controller, the analog media gateway processes the message;

The signaling proxy point converts the ISDN line interface identifier in the message into an independently assigned ISDN line interface identifier in the media gateway corresponding to the message;

The signaling proxy point emulates the media gateway controller to send a message that has been converted to the interface identifier to the corresponding media gateway.

The method also includes the following steps:

The signaling agent point monitors whether the IUA link between the media gateway and the media gateway is interrupted. Then the interrupt event is converted to the Q.921 split link indication to the media gateway controller.

The method also includes the following steps:

The signaling agent point monitors whether the IUA link between the device and the media gateway controller is interrupted. If yes, the interrupt event is converted to a Q.921 split request sent to the media gateway, or the active teardown and media gateway control flow transmission. Protocol connection.

The present invention also provides a high-capacity ISDN access method in a next-generation network, which is applied to the system described above, and includes:

When the signaling agent point receives the message from the media gateway controller, the analog media gateway processes the message;

By comparison, it can be found that the main difference between the technical solution of the present invention and the prior art is that an independent IUA signaling proxy point is added in the network, used for IUA signaling aggregation and conversion, and an SCTP connection connected to a large number of media gateways. The upper ΙϋΑ signaling is aggregated to a small number of SCTP connections connected to the media gateway controller, and the operation of the media gateway emulates the media gateway controller, simulating the operation of the media gateway controller providing a media gateway providing a large number of ISDN interfaces.

The difference in this technical solution has brought about a more obvious beneficial effect, that is, because

IUA signaling aggregation, the media gateway controller only needs to maintain a small number of SCTP connections between the signaling proxy points, and the small number of SCTP connections correspond to numerous SCTP connections between the signaling proxy point and a large number of media gateways. The idle probability of the SCTP connection connected to the media gateway controller is greatly reduced, and the utilization of the SCTP connection of the media gateway controller is improved, thereby enabling the media gateway to control The processing efficiency of the controller has also been improved.

The present invention does not need to make any changes to the media gateway and the media gateway controller. As long as a signaling proxy point is added to the network, and the IUA interface is connected with the media gateway and the media gateway controller, it is convenient for the existing network. The transformation can protect the operator's previous investment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a standard networking structure for providing an ISDN service in an NGN network;

Figure 2 is a block diagram of the IUA protocol stack;

3 is a structural diagram of a large-capacity ISDN access system in an NGN according to an embodiment of the present invention;

4 is a schematic diagram of an IUA signaling proxy point function module and a protocol stack according to an embodiment of the present invention;

FIG. 5 is a flowchart of processing an uplink message by a signaling agent point in an embodiment of the present invention; FIG.

6 is a flow chart showing the processing of a downlink message by an IUA signaling agent point according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described in detail below with reference to the accompanying drawings.

The present invention is first described in terms of a network structure. As shown in FIG. 3, the present invention adds an independent IUA signaling proxy point between the original media gateway controller and the media gateway. The newly added IUA signaling proxy point is connected to each media gateway through the IUA interface on the one hand, and to the media gateway controller through the IUA interface on the other hand. The media gateway controller controls the media resources on each media gateway through H.248/MGCP.

This IUA signaling agent is responsible for convening the IUA link of the media gateway and then concentrating on a small number of IUA links that are connected to the media gateway controller. Since H.248/MGCP signaling is based on the User Datagram Protocol ("UDP"), there is no increase in the number of gateways (this is because UDP is connectionless), so H. 248/MGCP signaling can interact directly between the Media Gateway Controller and the Media Gateway without the need for aggregation.

The functions implemented by the IUA signaling agent point include: N2006/000271 a 7—

First, the ΙϋΑ signaling aggregation aggregates the 信令 signaling on the SCTP connection connected to the mass media gateway to a small number of SCTP connections connected to the media gateway controller. Because of the IUA signaling aggregation, the media gateway controller only needs to maintain a small number of SCTP connections between the signaling agent points, and this small number of SCTP connections correspond to numerous SCTP connections between signaling agent points and a large number of media gateways. The idle probability is greatly reduced, so the utilization of the SCTP connection of the media gateway controller is improved, and the processing efficiency of the media gateway controller is also improved.

Second, IUA signaling conversion, for the media gateway, the IUA signaling proxy point is simulated into a media gateway controller in the existing standard networking, and for the media gateway controller, the IUA signaling proxy point is simulated into the existing standard networking. Media Gateway, this media gateway provides a large number of ISDN interfaces. In other words, from the perspective of the media gateway, there is no difference between the IUA signaling proxy point and the standard media gateway controller. The interaction between the media gateway and the signaling proxy point is exactly the same as the standard interaction with the media gateway controller. From the perspective of the media gateway controller, the IUA signaling proxy point is a media gateway that accesses a large number of ISDN lines. Of course, the media gateway is virtual, and the ISDN line it accesses is a collection of ISDN lines accessed by all media gateways connected to the IUA signaling agent point. The IUA signaling proxy point enables the media gateway and the media gateway controller to "not see" each other, which is achieved by the conversion of IUA signaling.

As can be seen from the network structure, the present invention does not need to make any changes to the media gateway and the media gateway controller, as long as a signaling agent point is added to the network, and the IUA interface is connected to the media gateway and the media gateway controller. Yes, it is easy to modify the existing network and protect the operator's previous investment.

The network structure is described above. The implementation of the IUA signaling proxy point is described in detail below. Figure 4 shows the functional blocks and protocol stack of the ΙϋΑ signaling agent point.

The IUA signaling proxy point is mainly composed of an IUA ASP module, an IUA SG module, and a node interworking function (NIF) module. The IUA ASP module faces the media gateway side and is connected to the media gateway through the underlying IP interface. The IUA SG module faces the media gateway controller side and is connected to the media gateway controller through the underlying IP interface. The NIF module implements signaling aggregation between the IUA ASP module and the SG SG module through some conversion. The specific functions of each module are described below.

The IUA ASP module is used to simulate the function of the media gateway controller and interact with the media gateway. This module enables the ΙϋΑ signaling agent to act as a standard media gateway controller for the media gateway. The IUA module is used to simulate the function of the media gateway and interact with the media gateway controller. This module enables the IUA Signaling Agent Point to appear to the Media Gateway Controller as a standard media gateway that accesses a large number of ISDN lines.

The NIF module is used to implement signaling aggregation. The following functions are implemented:

First, the mutual mapping between the independently assigned interface identifier (Interface ID) on each media gateway and the interface identifier (Interface ID) uniformly assigned by the IUA signaling proxy point is performed. The interface identifier on the media gateway is allocated for each ISDN line, that is, an ISDN line is connected to the media gateway, and an interface identifier is set. The interface identifier on the IUA signaling proxy point is the IUA signaling. All ISDN lines allocated at the proxy point are allocated. Of course, these ISDN lines are not directly connected to the signalling agent point, but are indirectly connected to the IUA signaling agent through the media gateway. of. Since the IUA signaling agent point appears to the media gateway controller as a standard media gateway, the interface identifiers must be uniformly assigned to these ISDN lines.

Second, the conversion of the two-side link/link set state is realized, and transparent and seamless IUA signaling conversion is achieved. There are many types of IUA link/link set state transitions. Here are two examples: Example 1. Convert the monitored IUA link interrupt event between the signaling agent point and the media gateway to Q, 921. The indication is reported to the media gateway controller. Example 2: The interrupt event of the ΙϋΑ link between the monitored IUA signaling agent point and the media gateway controller is converted into a Q. 921 unlinking request and sent to the media gateway, or actively removed. SCTP connection to the media gateway. The above two examples are related to chain scission, and those skilled in the art will appreciate that the transition of the IUA link/link set state can also be related to link recovery and the like.

The implementation of the IUA signaling proxy point is described above. The following describes the processing of the signaling message from the uplink (media gateway to media gateway controller) and downlink (media gateway controller to media gateway) directions. Method:

Figure 5 shows the processing flow of the uplink signaling message by the ΙϋΑ signaling agent.

In step 510, the analog media gateway controller processes the message when the signaling agent point receives the message from the media gateway. The specific method of processing is the same as the existing standard media gateway, and will not be described in detail here.

Thereafter, proceeding to step 520, the IUA signaling agent points the ISDN line interface identifier in the message The ISDN line interface identifier uniformly assigned by the IUA signaling agent point is replaced.

Thereafter, proceeding to step 530, the IUA signaling proxy point simulates the media gateway, and sends a message that the interface identifier is converted to the media gateway controller.

Figure 6 shows the processing flow of the IUA signaling proxy point to the downlink message.

In step 610, the analog media gateway processes the message when the signaling agent point receives the message from the media gateway controller. The specific processing method is the same as that of the existing standard media gateway controller, and will not be described in detail here.

Thereafter, proceeding to step 620, the IUA signaling proxy point converts the ISDN line interface identifier in the message to an independently assigned ISDN line interface identifier in the media gateway corresponding to the message. The ISDN line interface identifier in the message is uniformly allocated in the ΙϋΑ signaling agent point. If it is sent to the media gateway without conversion, the media gateway will not correctly identify it.

Thereafter, proceeding to step 630, the IUA signaling proxy point emulates the media gateway controller to send a message that translates the interface identifier to the corresponding media gateway.

Although the present invention has been illustrated and described with reference to the preferred embodiments of the present invention, those skilled in the art The spirit and scope of the invention.

Claims

Rights request

1. An ISDN access system in a next generation network, comprising a media gateway controller and a plurality of media gateways controlled by the media gateway control protocol,

The method further includes: a signaling proxy point, which is respectively connected to the media gateway and the media gateway controller through the IUA link, and is used to aggregate the IUA link between the signaling proxy point and the media gateway to An IUA link between the signaling proxy point and the media gateway controller, and performing an IUA signaling conversion between the media gateway controller and the media gateway.

The ISDN access system in the next generation network according to claim 1, wherein the sum of the number of IUA links between the signaling proxy point and the media gateway is greater than the signaling proxy point and The number of IUA links between the media gateway controllers.

The ISDN access system in the next generation network according to claim 1 or 2, wherein the signaling proxy point comprises:

a first module, connected to the media gateway, for simulating interaction between the media gateway controller and the media gateway;

a second module, connected to the media gateway controller, configured to interact with the analog media gateway and the media gateway controller;

a node interworking function module, configured to perform mutual mapping between an independently assigned ISDN line interface identifier on the media gateway and an ISDN line interface identifier uniformly allocated by the signaling proxy point, and an IUA connected to the media gateway controller State transitions between the link and the set of links that are linked to the media gateway.

The ISDN access system in the next generation network according to claim 3, wherein the IUA link interruption event between the signaling proxy point and the media gateway is converted into a Q.921 splitting indication report to the office The media gateway controller.

5. The ISDN access system in a next generation network according to claim 3, wherein an interrupt event of the IUA link between the signaling proxy point and the media gateway controller is converted to

Q. The 921 unlinking request is sent to the media gateway, or the flow control transmission protocol connection with the media gateway is actively removed.

An ISDN access method in a next generation network, which is applied to the system of claim 1, and includes: When the signaling proxy point receives the message from the media gateway, the analog media gateway controller processes the message;

The signaling proxy point converts the ISM line interface identifier in the message to an ISDN line interface identifier uniformly allocated by the signaling agent point;

An ISDN access method in a next generation network, which is applied to the system of claim 1, and includes:

8. The ISDN access method in a next generation network according to claim 6 or 7, further comprising the process of the signaling proxy point monitoring the status of the IUA link between the media gateway and the media gateway, if the signaling proxy point After detecting that the IUA link between the media gateway and the media gateway is interrupted, the interrupt event is converted to the Q.921 split link indication to the media gateway controller.

9. The method for accessing ISDN in a next generation network according to claim 6 or 7, further comprising the process of monitoring a status of an IUA link between the signaling agent point and the media gateway controller,

If the signaling agent detects that the IUA link between the media gateway controller and the media gateway controller is interrupted, the interrupt event is converted to a Q.921 split request sent to the media gateway, or the active teardown and media gateway flow control is performed. Transport protocol connection.

An ISDN access method in a next generation network, which is applied to the system of claim 1, characterized by comprising:

The signaling proxy point converts the ISDN line interface identifier in the message into a signaling generation The I SDN line interface identifier uniformly assigned by the management point;