System operable to transmit and receive messages

Details System operable to transmit and receive messages System operable to transmit and receive messages

2004-07-14

2009-11-17

Rao, Seema S (Department: 2416)

Multiplex communications

Diagnostic testing

Fault detection

C370S447000

Reexamination Certificate

active

07619980

ABSTRACT:
A system, minimising transmission delays and avoiding loss of synchronisation, using a contention based multiple access protocol comprises n transceivers each comprising a detector for detecting the condition of the medium and connected to a controller for switching the transceiver from receiving to transmitting or vice versa. Each transceiver also comprises a to the controller connected backoff counter operable to decrement its count at the end of each time slot when performing a backoff procedure. A transceiver which wishes to transmit and is performing the backoff procedure for which the detector detects that the medium is busy, the controller freezes the backoff counter and if this medium busy condition is subsequently determined to be a false alarm the controller resumes the backoff counter at the beginning of the next time slot after rejection of the false alarm, using the time slot timings in force prior to the false alarm event.

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