Switching system control arrangements
First Claim
1. In an arrangement comprising a plurality of user access lines each connecting at least one user terminal to a switching arrangement, said user access lines being capable of multiple concurrent communications each having a unique identity and each user terminal being associated with at least one data channel for conveying information relating to the communications conveyed by the user access lines, the method comprising the following steps:
- creating a control process for each active communication in said arrangement;
creating a data structure for each active communication in said arrangement, each data structure including the unique identity of the associated communication and the identity of the control process associated therewith;
transmitting by one of said user terminals a first message relating to a given communication in the data channel associated with that user terminal, said first message comprising the unique identity of the given communication; and
searching, in response to said first message, only those data structures associated with the data channel conveying said first message to locate the data structure including the unique identity of said given communication.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and arrangements for associating control messages received in the D-channel of an integrated services digital network (ISDN) line with the call control process to which the message relates are disclosed. With ISDN, a single control channel, called the D-channel, can be used concurrently to control a plurality of calls. As each call is initiated, a call control process and data structure including the unique identity of the call, are created. The data structures associated with the same D-channel are linked together. When a control message including a given identity is received, the data structures associated with the D-channel conveying the message are searched in sequence until a data structure having the given identity is found. The contents of this data structure are used to access the control process associated therewith. When the search reveals no matching identity and the message is a call setup message, a new process and data structure are created.
132 Citations
12 Claims
-
1. In an arrangement comprising a plurality of user access lines each connecting at least one user terminal to a switching arrangement, said user access lines being capable of multiple concurrent communications each having a unique identity and each user terminal being associated with at least one data channel for conveying information relating to the communications conveyed by the user access lines, the method comprising the following steps:
-
creating a control process for each active communication in said arrangement; creating a data structure for each active communication in said arrangement, each data structure including the unique identity of the associated communication and the identity of the control process associated therewith; transmitting by one of said user terminals a first message relating to a given communication in the data channel associated with that user terminal, said first message comprising the unique identity of the given communication; and searching, in response to said first message, only those data structures associated with the data channel conveying said first message to locate the data structure including the unique identity of said given communication. - View Dependent Claims (2, 3, 4, 5)
-
-
6. In an arrangement comprising a plurality of terminal end points, each having a unique terminal end point identifier, connected to a switching network by access lines, said access lines being capable of a plurality of concurrent communications, each communication being associated with a data channel for conveying control information packets to said switching network for controlling connections therethrough, the method comprising:
-
creating a control process for each communication in said network; creating a data structure for each communication in said network, each data structure including the terminal end point identifier of the terminal end point of the associated communication, a call reference value, and the identity of the control process of the associated communication; transmitting, by a given one of said terminal end points, a control information packet relating to a given communication in the one of said data channels associated with said given communication, said control information packet including the terminal end point identifier of the given terminal end point and a call reference value; searching, in response to said control information packet, only those data structures relating to communications associated with the data channel conveying said control information packet to locate a data structure including the same terminal end point identifier and call reference value included by said control information packet. - View Dependent Claims (7, 8, 9)
-
-
10. In a communication system having a plurality of channels, a lesser plurality of said channels being capable of conveying data for a plurality of concurrent communications, each communication having a unique identity, an arrangement comprising:
-
a control process associated with each communication in said arrangement; a data structure associated with each communication in said arrangement each data structure including the unique identity of the communication and call control process associated therewith; means for transmitting a message for a given communication in a given one of said lesser plurality of channels, said message comprising the unique identity of said given communication; and searching means responsive to said message for searching only those data structures associated with said given one of said lesser plurality of channels to identify a control process associated with said given communication. - View Dependent Claims (11, 12)
-
Specification