R.F. communication system interrogation apparatus and method

Details R.F. communication system interrogation apparatus and method R.F. communication system interrogation apparatus and method

1992-11-17

1995-02-14

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

455 381, 455 531, 34082554, H01Q 900

Patent

active

053903609

ABSTRACT:
In a radio frequency communication system, a primary unit interrogates a plurality of secondary units over a radio communication channel. The primary unit receives a command to initiate an interrogation cycle over the communication channel. The primary unit then selects a time delay from a set of time delays, and transmits an interrogation request to each secondary unit of at least a subset of the plurality of secondary units in series after the selected time delay if the channel is free at the end of the selected time delay. The primary unit then selects the longest time delay for the next interrogation cycle if a channel grant command is received, and selects a shorter time delay for the next interrogation cycle if no channel grant command is received.

REFERENCES:
patent: 4352183 (1982-09-01), Davis et al.
patent: 4534061 (1985-08-01), Ulug
patent: 4628311 (1986-12-01), Milling

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