Broadband signalling

Details Broadband signalling Broadband signalling

1998-07-10

2001-11-06

Nguyen, Chau (Department: 2663)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S410000, C370S522000

Reexamination Certificate

active

06314104

ABSTRACT:

TECHNICAL FIELD OF THE INVENTION AND DESCRIPTION OF RELATED ART
When using a broadband network, different types of calls could be set up. For example B-ISDN standards offers both ordinary point to point calls between two users, but also point to multipoint calls. New signaling standards are continuously set by ITU-T concerning the ATM environment. In the closest future new standards regarding point to point multiconnection calls will be set. The need for point to point multiconnection calls occurs when several connections have to be established within one single call between two users. Multimedia is one application where this technique is applicable, for example to send video on one channel, speech on a second and data on a third channel. Video on demand could be another adequate application.
Multiconnection calls per se are already known as a service in B-ISDN. The provision of multiconnection calls requires special parameters, for example the originating Call Identifier (OCID) and the Destination Call Identifier (DCID). The OCID is assigned by an originating local exchange prior to establishment of a multiconnection call. It is used to identify the call association between originating and destination local exchanges. The DCID identifies the call association at the receiving end and is created at the destination exchange. The first Originating Call Identifier value received is reflected as the Destination Call Identifier value. The call identifiers at the originating and destination exchanges remain constant as long as a signalling association belonging to a multiconnection call is present. The call identifiers are independently assigned by each of the originating and destination exchanges concerned, A and B, enabling each exchange to uniquely identify the signalling associations belonging to a multiconnection call.
The originating call identifier A is assigned by the originating exchange A, when sending the first message for the first signalling association belonging to a multiconnection call, it is used to identify the signalling associations belonging to a multiconnection call at the originating exchange A.
The originating call identifier B is assigned by the destination exchange B, when receiving the first message for the first signalling association belonging to a multiconnection call, it is used to identify the signalling associations belonging to a multiconnection call at the destination exchange B.
The destination call ID A equals the originating call ID A, and the destination call ID B equals the originating call ID B.
The first initial address message of a signalling association belonging to a multiconnection call shall contain the OCID—A.
The succeding IAM messages relative to the same multiconnection call shall contain the DCIB-B.
In the destination exchange, the first backward message sent after the Ink message for the first connection shall contain the OCID-B and the DCID-A.
The OCID and DCID parameters are only processed by the originating and the destination exchanges. These parameters convey transparently through all intermediate exchanges in the B-ISDN network and have no U;I significance. The signalling with the OCID and DCID according to what is described above is performed in the higher B-ISDN layers and is relevant to the ATM NNI (Network Node Interface), more specific according to the. B-ISUP protocol shown in FIG.
1
. As also can be seen in the figure, the B-ISUP only handles the signalling on the ATM NNI level where it serves to guarantee unique connection identifiers between originating and destination exchange. The B-ISUP operates over the Message Transfer Protocol 3 (MTP3). This allows B-ISDN to operate directly over ATM networks. The series of ITU-T Recommendations Q.2761 through Q.2764 specify the B-ISUP protocol.
The invention on the other hand relates to broadband signalling at the user interface. (see
FIG. 1
a
,
1
b
and
1
c
) i.e at the ATM UNI-level (User Network Interface) where a need of a Connection Correlation Identifier (CCID) has been identified, in order to coordinate the individual connections with the respective multiconnection call. This is needed because in a private network it will be possible to route the individual connections of the call differently.
The B-ISUP protocol for multiconnection calls has to support the transfer of the values of the Connection correlation identifier.
The mechanism which will be further described is similar to the signalling according to the B-ISUP protocol. By using a similar mechanism as the B-ISUP at the ATM UNI, additional non-expexted advantages, which will be described, are obtained.


REFERENCES:
patent: 5351286 (1994-09-01), Nici
patent: 5440551 (1995-08-01), Suzuki
patent: 5678008 (1997-10-01), Hin
patent: WO 05/06991 (1995-03-01), None
Summary of ITU-T Recommendation Q.2761, “Broadband Integrated Services Digital Network (B-ISDN)—Functional Description of the B-ISDN User Part (B-ISUP) of Signalling System No. 7”, Feb. 1995.
Summary of ITU-T Recommendation Q.2762, “Broadband Integrated Services Digital Network (B-ISDN)—General Functions of Messages and Signals of the B-ISDN User Part (B-ISUP) of Signalling System No. 7”, Feb. 1995.
Summary of ITU-T Recommendation Q.2763, “Broadband Integrated Services Digital Network (B-ISDN)—Signalling System No. 7 B-ISDN User Part (B-ISUP)—Formats and Codes”, Feb. 1995.
“11.4 ATM-Based Applications” pp. 337 and 338.
“9.6.3 Point-to-Point Call Setup and Release Examples”, pp. 269-270.
“Proposed Initial Draft for Q.27CC (Multiconnection Call)”, Q.27CC Editors, Study Group 11, Geneva, Apr. 24-May 12, 1995.
ITU-T Q.2764, “B-ISDN Application Protocols of the Network”, pp. 1-79, Feb. 1995.

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