Random access communication system with contention scheduling of

Details Random access communication system with contention scheduling of Random access communication system with contention scheduling of

1987-01-05

1988-05-17

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 94, H04J 324

Patent

active

047455993

ABSTRACT:
A random access communication system forms messages to be transmitted into subpackets of fixed duration. A message packet includes two or more subpackets. Each subpacket includes information relating to the source transmitter-receiver and the number of subpackets in the message. The subpackets of the message packet are transmitted contiguously over the transmission path in a contention mode. Some subpackets are successfully received and some are lost due to collisions. After a period of asynchronous contention operation, a predetermined number of subpackets are successfully received, and the system switches to a short-term synchronous, scheduled operating mode. In the scheduled operating mode, those transmitter-receivers which were the sources of message packets including some successful and some unsuccessful subpackets retransmit the data from the unsuccessful subpackets, ordering themselves in accordance with the order of receipt of successful subpackets. The system capacity is high, average delay is short and continuous global synchronization is not required.

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