Method and apparatus for preventing message collisions in a half

Details Method and apparatus for preventing message collisions in a half Method and apparatus for preventing message collisions in a half

1997-01-08

2000-11-14

Kizou, Hassan

Multiplex communications

Duplex

Communication over free space

370236, 370468, G06F 1100, H04B 714, H04J 316

Patent

active

061479780

ABSTRACT:
In a half-duplex communication system in which additional delays in the communication channel may cause a message collision between a message and a response, a timer based collision prevention circuit is utilized to prevent the message collision. The collision prevention circuit determines if the message transmitted by a communication device will be repeated. If the message is to be repeated, the collision prevention circuit sets a countdown collision timer to a predetermined period of time shorter than the shortest repetition interval of the repeated message. A response is only sent to the communication device if the collision timer has not expired. If the timer expires, the collision prevention circuit waits for the message to be retransmitted by the source device before sending the response to the communication device.

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