CN1326643A

CN1326643A - Signalling in telecommunications system

Info

Publication number: CN1326643A
Application number: CN 99813418
Authority: CN
Inventors: L·格拉夫; I·赖蒂纳; C·格罗维斯
Original assignee: Telefonaktiebolaget LM Ericsson AB
Current assignee: Telefonaktiebolaget LM Ericsson AB
Priority date: 1998-11-16
Filing date: 1999-11-15
Publication date: 2001-12-12
Also published as: WO2000030370A1; EP1131957A1; AU1966000A; JP2002530952A; FI982472A; FI106595B; FI982472A0

Abstract

A method of communicating signalling data between a pair of telecommunication exchanges (1,3) employing ISUP signalling, via a packet switched data network. The method comprising using H.323 protocol to communicate over the data network where signalling data is carried by a Q.931 based protocol extended to provide for the transmission of the ISUP Network Discard Indicator message.

Description

Signaling in the telecommunication system

Field that the present invention belongs to:

The present invention relates to the signaling in the telecommunication system and be particularly related to by packet switching network command transmitting data.

Background technology:

The conventional telecommunication network that transmits sound and other user profile generally depends on special-purpose communication network foundation structure and host-host protocol.But, along with the explosive growth of recent digital data transfer, particularly driven by the use of intranet and internet, in telecommunications industry, tend to use more common foundation structure and host-host protocol.This tendency is mainly driven by the expectation of interactive operation between telecommunications network and other data network, secondly is the feature performance benefit that is better than the conventional telecommunications system that cost and general data net system provide.

1996, International Telecommunication Union formulated the standard of " interference networks " transmitting multimedia data of forming by Local Area Network and by the LAN of a plurality of interconnection.H.323 this standard is called, and 1998 revisions are called H.323 second edition.H.323 main and essential part is transmitting digitized and the regulation of the voice data of compression.But, H.323 also stipulated the optional provision of transmission of video and other data mode.

H.323 make to use the ITU standard Q.931 be used for two H.323 terminal room to set up call negotiation be necessary, to set up the channel between them, can send user and signaling data by this channel terminal.In addition, Q.931 be to be used for that specific call keeps and expiry feature is necessary.

May state-of-the-art communication network agreement be known as international standard digital network (ISDN).In the link between user and this user's local switch (user " access point "), ISDN uses the signaling protocol that is called as digital subscriber signaling system No.1 (DSS1), use the further agreement that is called as ISDNYong Hubufen (ISUP) in network, to transmit signaling data simultaneously, i.e. the inner exchanging signaling.Even in the network that does not use the ISDN Access Network, for example Access Network is public switch telephone network (PSTN), and ISUP usually also is used for the inner exchanging signaling.

In the telecommunication market of current competition, it is very crucial wide and value-added service variable range being provided and operating cost is minimized telecommunication operator terminal temperature difference.Thus, existing communication network agreement, and particularly ISUP has developed into many information and the parameter of transmission about such business is provided between the various nodes (or signalling point) of network.

Because Q.931 signaling protocol is mainly based on the DSS1 agreement, ISUP and H.323 between intercommunication satisfactory substantially.Thereby may replace the mid portion of ISUP net with net (perhaps using the H.323 TCP/IP net of agreement or rather) H.323.For example, two telephone exchanges can be undertaken by net H.323 such as the connection between the switch.

The present invention's general introduction:

The present inventor finds, that H.323 uses existingly can not adapt to based on the certain information that produces in the ISUP network based on signaling protocol Q.931.More particularly, find switch not support package be contained under the situation of the User-to-User Signaling information in the Q.931 message that is received, existingly can not adapt to the network deletion Indication message that can produce at the communication network switch based on signaling protocol Q.931.Mean the switch that starts from User-to-User Signaling information based on this defective in the signaling protocol Q.931, for example can't notify desampler to delete this signaling information.This will cause calling party to cross charge under certain conditions.

An object of the present invention is to overcome or relax at least the above-mentioned defective of existing telephony signaling system.Further aim of the present invention provides a kind of telecommunication system, uses packet switching network transmission voiceband user and data message and signaling data, and wherein network deletion Indication message can send by the network between a pair of switch.

According to a first aspect of the present invention, the method that transmits signaling data by Packet Switch Data Network between a pair of telecommunications switch that uses the ISUP signaling is provided, this method comprises by data network uses H.323 protocol communication, wherein signaling data passes through based on Q.931 agreement transmission, and this agreement is expanded to prepare transmission ISUP network deletion Indication message.

Better, H.323 the Q.931 agreement of the expansion of the present invention's use is arranged at and uses in the protocol stack.Preferably, described connection that forms between user both sides or part connect by providing based on the TCP/IP network.This network can be LAN, interference networks, internet or two or the combination of more a plurality of networks in them.In these examples, H.323 protocol stack provides by the ICP/IP protocol storehouse.

According to a second aspect of the present invention, the equipment that transmits signaling data by Packet Switch Data Network between a pair of telecommunications switch that uses the ISUP signaling is provided, this equipment comprises by data network and uses the H.323 device of protocol communication, wherein signaling data is by transmitting based on agreement Q.931, and this agreement is expanded to prepare transmission network deletion Indication message.

The drawing explanation:

For understanding the present invention better and in order to represent how the present invention can implement, and will describe by the exemplary reference accompanying drawing, wherein:

Fig. 1 summary illustrates the communication network that transmits user and signaling data by IP network between the network switch; With

Fig. 2 is the flow chart of transmission network deletion Indication message in presentation graphs 1 network.

Some embodiment describe in detail:

In the communication network of Fig. 1, first telephone exchange 1 is coupled to user terminal 2 by ISDN Access Network (promptly using the Digital Subscriber Signaling No.1 agreement), and second switch 3 is coupled to user terminal 4 by the PSTN Access Network simultaneously.Inter-exchange signaling in the network uses ISDN User Part information to transmit, and requires the regulation at the PSTN of PSTN/ISUP interface 5 switch 3.In the situation of the calling of 2,4 of two user terminals, to set up from terminal 2 and to call out, terminal 2 is called " calling party ", and another terminal 4 is called " callee ".Know that terminal 2,4 is connected to separately access switch 1,2 by middle routing node (for example multiplexer/demultiplexer).

Below description be based upon ITU H.323 on the disclosure of standard, it is indispensable use between two terminals that H.323 allow, set up and keep calling out connect based on standard Q.931.In example shown in Figure 1, the switch 1,3 of two communication networks is communicated by letter by the terminal that H.323 allows 6,7 separately, and these two terminals communicate with one another by IP-based network 8 again.In terminal 6,7 H.323, H.323 protocol stack is positioned at ICP/IP protocol layer top, and so H.323 data can transmit at inter-exchange by IP network 8.Therefore, there is the protocol stack of forming by the ISUP Q.931 on the TCP/IP at each switch.

Consideration calling party 2 in call establishment wishes to send the situation of certain User-to-User Signaling information to callee 4, and calling party's 2 available ISDN Access Networks are made it to become easy.This information for example can comprise the forward direction information of calling out, Call Waiting information or similar information.Information is advanced suitable Q.931 message and is sent to terminaling exchange 3,5,7 by network 8 H.323 in that access switch 1,6 is packed.Supposition terminaling exchange 3 can not use the User-to-User Signaling information that is received now.Terminaling exchange 3 must produce a network deletion Indication message in this case, Q.931 encapsulating in the message, and the Q.931 message that will obtain sends it back the original switching machine by IP network 8.

Q.931 standard definition has notice (NOTIFY) information of following structure, reference items indication corresponding information unit reference items in standard Q.931 wherein, unit of direction indication can be by direction (the n=network of NOTIFY information transmission, and the element length in Length Indication eight hytes u=H.323 user):

Information unit	Reference items (clause)	Direction	Type	Length
Information unit	Reference items (clause)	Direction	Type	Length	Protocol discriminator	????4.2	Two-way	????M	????1
The call reference item	????4.3	Two-way	????M	????2	Protocol discriminator	????4.2	Two-way	????M	????1
The call reference item	????4.3	Two-way	????M	????2	Information type	????4.4	Two-way	????M	????1
Payload capacity	????4.5	?n→u	????O	???2-12	Information type	????4.4	Two-way	????M	????1
Payload capacity	????4.5	?n→u	????O	???2-12	The notice indication	????4.5	Two-way	????M	????3
Show	????4.5	?n→u	????O	????≥2	The notice indication	????4.5	Two-way	????M	????3

In six message elements, the notice indicating member is defined as having three kinds of significant values or state in existing Q.931 standard, and they are:

Bit 7654321
Bit 7654321		?0?0?0?0?0?0?0 ?0?0?0?0?0?0?1 ?0?0?0?0?0?1?0	The user stops the user and recovers the bearer traffic change

All other values all are retained at present.

Expansion to agreement is Q.931 proposed to prepare to be used for network deletion Indication message here.This distribution of messages is given any one retention of notice indicating member.

Fig. 2 is that expression is included in the flow process that is relayed to the step the network deletion Indication message of isdn switch 1 from PSTN switch 3.

Those skilled in the art can understand, can make various improvement to the foregoing description without departing from the present invention.For example, though the foregoing description has been described the included content of network deletion Indication message in the notification message Q.931, other message can be used for the retention of current existence.The switch that network deletion Indication message sends betwixt can by one or more intermediary switch be coupled by the IP network of only for example between two intermediary switch, extending at the mid portion that signaling is connected.In such cases, network deletion Indication message can be in terminating or ingress switch or an intermediary switch generation.Network deletion Indication message can be delivered to IP network by the switchboard direct sending and receiving that produce information, perhaps can at first send to an intermediary switch, such as passing through signaling system No.7 (SS7) signaling network.

Claims

1. method that between a pair of telecommunications switch that uses the ISUP signaling, transmits signaling data by Packet Switch Data Network, this method comprises by data network uses H.323 protocol communication, wherein signaling data is by transmitting based on agreement Q.931, and this agreement is expanded to be provided for transmitting ISUP network deletion Indication message.

2. method according to claim 1, H.323 the Q.931 agreement of wherein arranging to be expanded is being used in the protocol stack.

3. method according to claim 2, described connection that wherein forms between the user side or part connect to be provided by the TCP/IP network.

4. method according to claim 3, wherein H.323 protocol stack provides by the ICP/IP protocol storehouse.

5. equipment that between a pair of telecommunications switch that uses the ISUP signaling, transmits signaling data by Packet Switch Data Network, this equipment comprises by data network and uses the H.323 device of protocol communication, wherein signaling data is by transmitting based on agreement Q.931, and this agreement is expanded to prepare transmission ISUP network deletion Indication message.