WO2007131398A1

WO2007131398A1 - Ngn network based on pstn network

Info

Publication number: WO2007131398A1
Application number: PCT/CN2006/003247
Authority: WO
Inventors: Bo Zhao
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-05-15
Filing date: 2006-12-01
Publication date: 2007-11-22
Also published as: CN101052021A

Abstract

A NGN network based on PSTN network includes: setting a MG which supports IP over E1 in the TDM network of PSTN network, the said MG connects down to the user or relay, and up to IP network via IP over E1 interface by TDM transport network. By instead of the switch node or remote exchange module, remote access module in the PSTN network using an access MG which supports IP over E1 interface, it realizes that the PSTN network is changed to be a part of NGN network without adding new IP network and changing the existing TDM transport network. The user can access into NGN network and enjoy the various services based on the reuse of the existingnetwork infrastructure and the lower cost.

Description

An NGN network based on PSTN network construction

Technical field

The present invention relates to the field of communications technologies, and in particular, to an NGN network constructed based on a PS network.

Background of the invention

(Public Telephone Switching Network) The network is a hierarchical fixed telecommunication service network, usually composed of switches of different levels. The switch can also be connected with a remote switching module, a remote access module, a V5 access network, and a WLL (wireless). Network devices such as local loops) and PBXs (small switches). The switch and the network device are connected by a transmission network based on TDM (Time Division Multiplexing) technology, including direct connection according to El, Tl, SDH (Synchronous Digital Hierarchy), or SONET (Synchronous Optical Network) technology or through a transmission device Transmission network connection.

The NGN network is based on IP technology and is a separate network of control and bearer. For existing users of the network, including: POTS (traditional ordinary telephone service) / ISDN (Integrated Services Digital Network), PBX, V5 access network, WLL, etc., or users from other PSTN networks, usually using MGC+MG Access to the NGN (Next Generation Network) network. The MGC (Media Gateway Control) has a call control function for processing the user; the MG (Media Gateway) is used to convert the media service flow of the PSTN user from the TDM-based bearer format to the IP-based bearer format, thereby interacting with the NGN network. Other users interoperate.

With the development and advancement of technology, the PSTN network will gradually evolve to the NGN network. In the prior art, when the PSTN network is transformed into an NGN network, an IP network is newly added by adding a router and/or a data transmission network, and the gateway is directly connected to the newly added IP network.

It can be seen from the above description that since the IP network is generally composed of a router and a data transmission network, the addition of an IP network generally means that the existing TDM transmission network is discarded or modified, resulting in an original investment loss of the operator, thereby increasing the operator's cost.

Summary of the invention

The present invention provides an NGN network constructed based on a PSTN network.

The invention is achieved by the following technical solutions:

An NGN network based on a PSTN network configuration, comprising: setting an access media gateway MG supporting an IP over El interface in a time division multiplexing TDM network in a PSTN network, the access MG accessing a user or a relay downwardly, Go up through the IP over El interface and access the IP network through the TDM transmission network.

Preferably, the TDM network and the IP network boundary are provided with a router supporting an IP over E1 interface, for terminating the IP over E1 connection; and/or,

Preferably, a border MG supporting an IP over El interface and a route forwarding function is provided for terminating IP over El connection.

Preferably, one or more intermediates supporting routing and forwarding functions are set between the access MG and the IP network.

MG.

It can be seen from the technical solution provided by the present invention that the present invention replaces the switch node or the remote switching module and the remote access module in the PSTN network by using the access MG supporting the IP over E1 interface, and realizes that no IP is added. The PSTN network is transformed into a part of the NGN network based on the network and without modifying the existing TDM transmission network. On the basis of reusing existing network infrastructure and saving investment, users can access the NGN network and enjoy various services of the NGN network.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of a networking of an embodiment of the method according to the present invention;

Figure 2 is a schematic diagram of setting up multiple MG networks on the MG and TDM boundaries.

Mode for carrying out the invention

The embodiment of the present invention provides an NGN network based on a network structure, and replaces a switch node, a remote switching module, and a remote access module in the PSTN network by using an access MG that supports the IP over El interface, and may not add an IP network. Based on the existing TDM transmission network, the PSTN network is transformed into an NGN network.

The network after the modification of the embodiment is as shown in FIG. 1 . The access MG is set in the existing TDM network of the PSTN network, and the access MG supports the IP over El interface, and the access MG accesses the POTS downward. /ISDN, ·ΡΒΧ, V5 access network, WLL access network or other types of users, through the IP over E1 interface, through the TDM transmission network and IP network connection. The call control of the IP network is implemented by the MGC.

On the boundary between the TDM network and the IP network, a router supporting the IP over E1 interface can be set to take out the IP packet from the TDM network and forward it to the IP network, thereby terminating the IP over E1 connection.

At the boundary between the TDM network and the IP network, the border MG supporting IP over El and existing connection with the IP network can also be used for forwarding. At this time, the MG needs to support the route forwarding function.

A plurality of intermediate MGs can be configured to perform media stream forwarding between the access MG and the IP network. As shown in FIG. 2, the intermediate MG also needs to support the route forwarding function. The intermediate MG or the border MG can simultaneously serve as an access MG for other users or relays.

When the media data stream is transmitted on the TDM network, it can be in the form of an IP packet, which is carried on the TDM network.

When transmitting media streams on a TDM network, in addition to using the bearer format of VoIP over El, you can also pass Carrier format transmission of VoMPLS over El or VoIP over MPLS over El. If the MPLS packet is used, the media stream is directly carried on the MPLS, that is, in the form of VoMPLS. Or the media stream is carried on the MPLS in the form of IP ^, that is, the VoIPoMPLS form. At this time, the MG of the access user and the router or border MG of the IP network boundary need to support the function of the LER (Label Edge Router) device in the MPLS; the intermediate MG needs to support the function of the LSR (Label Switch Router) device in the MPLS network.

The media stream is transmitted on the TDM network. Packets in the bearer format such as VoIP, VoMPLS, and VoMPLSoIP can also be carried on Tl, SDH, SONET or other digital circuits based on time division multiplexing.

Since the access MG can compress the media data stream, the media stream can be compressed by using a compressed codec format, such as compressing the PCM encoded voice stream into a G.729 encoded voice stream. When the media data stream is transmitted on the TDM network, the bandwidth occupation can be greatly reduced. For example, when the G.729 compression coding format is adopted, the bandwidth can be saved by 37 Kbps compared with the traditional switch, if the router on the border of the MG and the NGN network is connected or The boundary MG supports the compression codec format, and the bandwidth can be further saved by about 52Kbps.

The compression includes two ways: The first is to encode the speech signal in compression and decoding. The second is that the voice codec is put into an IP packet, and the IP header is further compressed. The former compresses the payload, and the latter compresses the IP packet header of the payload. Because voice packets are small packets, the IP header (IP/UDP/RTP) has a large proportion of overhead, so the compression header can also achieve a large bandwidth gain.

In the case of greatly reduced bandwidth usage, spare bandwidth can be used for redundant routing, and redundant routing can avoid the failure of TDM transmission network and forwarding node and improve reliability. For example, the access MG can configure two or more routes simultaneously to reach different NGN network border routers or border MGs. If there is a problem with the route being used due to a TDM transmission network or a border router or a border MG failure, other routes can be used to improve the reliability of the network.

In summary, the present invention replaces the switch node or the remote switching module and the remote access module in the PSTN network by using the access MG supporting the IP over E1 interface, thereby realizing that the IP network is not added and the existing access is not changed. Based on the TDM transmission network, the PSTN network is transformed into a part of the NGN network. On the basis of reusing existing network infrastructure and saving investment, users can access the NGN network and enjoy various services of the NGN network.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. .

Claims

Rights request

An NGN network based on a PSTN network, which is characterized in that: an access media gateway MG supporting an IP over El interface is set in a time division multiplexing TDM network in a PSTN network, and the access MG is connected downward The user or the relay enters the IP network through the TDM transmission network through the IP over E1 interface.

2. The NGN network constructed based on a PSTN network according to claim 1, wherein:

The TDM network and the IP network boundary are provided with a router supporting the IP over El interface for terminating the IP over El connection; and/or,

A border MG that supports the IP over E1 interface and route forwarding is used to terminate the IP over El connection.

3. An NGN network constructed based on a PST network according to claim 1 or 2, characterized in that one or more intermediate MGs supporting a route forwarding function are provided between the access MG and the IP network.

The network-based NGN network according to claim 3, wherein the border MG or the intermediate MG serves as an access MG of another user or a relay.

The NGN network constructed based on the PST network according to claim 1, wherein the access MG transmits the media stream by using a compressed media coding format.

The NGN network based on the network structure according to claim 5, wherein the access MG utilizes the compressed vacant bandwidth as a redundant route to avoid the failure of the TDM transmission network and the forwarding node.

7. The NGN network constructed based on the PSTN network according to claim 1, 5 or 6, wherein the media data stream is transmitted in the TDM network in the form of an IP packet when the media data stream is transmitted on the TDM network.

8. The NGN network constructed based on the PST network according to claim 1, 5 or 6, wherein the media data stream is transmitted in the TDM network, and the media stream is directly carried in the form of the MPLS packet.

Transmission on MPLS.

9. The NGN network based on the network structure according to claim 1, 5 or 6, wherein when the media data stream is transmitted on the TDM network, the media stream is carried on the MPLS in the form of an IP packet.

10. An NGN network based on a PSTN network configuration according to claim 1, 5 or 6, characterized in that, when the media stream is transmitted over the TDM network, the data packet is carried on a digital circuit based on time division multiplexing technology. .