Radio communication system

Details Radio communication system Radio communication system

2005-08-02

2005-08-02

Morse, Gregory (Department: 2134)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S176000, C370S312000, C370S335000, C375S140000, C375S146000

Reexamination Certificate

active

06925561

ABSTRACT:
A radio communication system has a random access channel for the transmission of data from a secondary station to a primary station while the secondary station is not engaged in a call. A secondary station wishing to use a random access channel resource transmits a preamble encoded with a signature corresponding to the required resource. In response the primary station can transmit a positive acknowledgement (ACK) corresponding to the received preamble, indicating that a channel is available, or a negative acknowledgement (NACK), indicating that the resource is not available. A first set of signatures are used to encode ACKs and a second set of signatures are used to encode NACKs. The two sets of signatures have the property that no signature in one set is the inverse of a signature in the other set, thereby avoiding the possibility of simultaneously transmitting an ACK and a NACK with signatures that are the inverse of one another.

REFERENCES:
patent: 4641322 (1987-02-01), Hasegawa
patent: 6181729 (2001-01-01), O'Farrell
patent: 1037481 (2000-09-01), None

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