Method of transmitting security codes to communication units

Details Method of transmitting security codes to communication units Method of transmitting security codes to communication units

1994-04-21

1997-03-18

Urban, Edward F.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 331, 379 58, 379 59, H04Q 720

Patent

active

056132158

ABSTRACT:
When it is desired to transmit important or secure information to one or more communication units, a message is transmitted (200) to only valid communication unit ID codes. The message requests an acknowledgment transmission from the communication unit, including the communication unit's ID code. When no acknowledgment is received for a particular ID code, the message is transmitted again after a period of time (204). When only one acknowledgment is received for a particular ID code, the important or secure information is then transmitted (206) to that particular ID code. When more than one acknowledgment is received for a particular ID code, no important or secure information is transmitted to that particular ID code, and the ID code is flagged (207) as a potential unauthorized ID code.

REFERENCES:
patent: 4955049 (1990-09-01), Ghisler
patent: 4964163 (1990-10-01), Berry
patent: 4992783 (1991-02-01), Zdunek et al.
patent: 5309501 (1994-05-01), Kozik et al.
patent: 5335265 (1994-08-01), Cooper et al.
patent: 5337345 (1994-08-01), Cassidy et al.
patent: 5420910 (1995-05-01), Rudokas et al.
patent: 5483465 (1996-01-01), Grube et al.

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