Multiplex communications – Data flow congestion prevention or control – Flow control of data transmission through a network
Reexamination Certificate
1997-11-18
2001-11-20
Matar, Ahmad (Department: 2642)
Multiplex communications
Data flow congestion prevention or control
Flow control of data transmission through a network
C370S522000, C370S410000
Reexamination Certificate
active
06320847
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to digital communication networks with measurable latency (i.e., call set up delay) in the network and in particular with reducing or minimizing such latency.
BACKGROUND OF THE INVENTION
Call set up in a modern digital telecommunication network involves numerous delays. Many expected delays are due to propagation delay between originating signal entry point and a signal termination point at its destination. Added delays causing significant call set-up latency involve such activities as evaluating control data such as subscriber authentication, call routing determination, access control, bandwidth availability, credit standing of originator, and desired signal encryption. These latency delays are for the most part due to the increasing number of message transfers between processors and controllers required in the system to accommodate these new services and authentication checks. In digital networks these delays further include digital signal processing for features such as error control and speech processing. If these delays are reduced or otherwise off-set call set up could proceed much more rapidly thus improving the overall quality of service.
SUMMARY OF THE INVENTION
Functions processed in arranging call set ups are operated concurrently with an actual call set-up to reduce overall call set up time. In a widely distributed communication network embodying the principles of the invention, call delays and eventual call set-up outcome are initially anticipated (i.e., an expected call outcome) at the initiation of a call from an originating terminal. The call routing connection, from origination hub to termination hub, in one embodiment, is initially completed, by a switched signal connection (including any intermediate hubs in the connection path) to a receiving hub and station/subscriber. In another embodiment the call routing connection is immediately connected to the receiving hub and a final complete connection to the receiving station/subscriber is delayed pending full call approval processing. In both embodiments administrative functions and call processing are performed in parallel with completion or near completion of a call connection.
If administrative and call processing determinations are unfavorable to completion or continuance of the completed call connection, the call connection is immediately disconnected. With parallel operation of these administrative functions both prior to and during call connection delay impact of administrative processing is significantly reduced.
By decreasing the number of related message transfers between network controllers and hubs required to complete the balance of administrative refinements of the call connection, the call is more rapidly and efficiently completed. The routing steps for setting up the call trajectory to the destination hub are nearly or totally completed immediately before the performance of call acceptance administrative steps, such as authentication, access control, bandwidth availability etc.
Administrative refinements during and subsequent to the preliminary call connection can be performed in a distributive manner. Administrative and capacity items are determined and completed during post route connection and connection/determination and computed or accessed in parallel making this information available for a final completion or near completion of the call connection. If this information is subsequently found to be adverse the connection of the call is immediately terminated.
In one aspect the processors for administrative and capacity determination are connected in a parallel manner and work concurrently, through initial probationary call connection or near a complete call connection.
REFERENCES:
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patent: 5872523 (1999-02-01), Dellaverson et al.
patent: 5963625 (1999-10-01), Kawecki et al.
patent: 0708571A2 (1996-04-01), None
patent: 2307618A (1997-05-01), None
patent: WO9631043A (1996-10-01), None
Agrawal Dharma P.
Agrawal Prathima
Rudrapatna Ashok N.
AT&T Corp.
Matar Ahmad
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