Packet radio communication system protocol

Details Packet radio communication system protocol Packet radio communication system protocol

1995-03-14

1997-03-11

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

3408255, 370394, 370913, 371 33, H04Q 100

Patent

active

056105959

ABSTRACT:
A method and apparatus for transmitting data in a packet radio communication system having data sources, destinations and intermediate repeaters. According to a packet protocol, a repeat count in the protocol is decremented each time a packet is retransmitted, until the repeat count reaches zero, at which time the packet is discarded. According to another packet protocol, a sequence index is used to prevent duplicate packets from being received by requiring that the sequence number fall within a sequence number window at each device, which is incremented each time a packet is received. The sequence number is also used to cause the retransmission of packets which are lost, at which time the sequence number windows in the devices which are affected are reset to allow transmission of the lost packet.

REFERENCES:
patent: 4060220 (1977-12-01), Metcalfe
patent: 4284976 (1981-08-01), Gable
patent: 4703475 (1987-10-01), Dretzka
patent: 5151899 (1992-09-01), Thomas
Fox, Terry L., "AX.25 Amateur Packet-Radio Link-Layer Protocol," Version 2.0, American Radio Relay League, Inc., Oct. 1984.
International Organization for Standardization, International Standard 4335, "Data communication--High-level data link control procedures--Consolidation of elements of procedures," Second edition--1984, Dec. 15.

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