Method and apparatus for maintaining continuous synchronous encryption and decryption in a wireless communication system throughout a hand-off
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United States of America Patent
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Sep 7, 1993
Grant Date -
N/A
app pub date -
May 22, 1992
filing date -
May 22, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
In a wireless communication system comprising a plurality of fixed communication units (FCUs) (102) and portable communication units (PCUs) (120), each comprising an encryption synchronization counter (ESC) (314, 414), the PCU and FCU having a digital transmission format (201), a method of maintaining encryption and decryption throughout a hand-off is shown, comprising the steps of: (a) loading (708) during a hand-off initiation a continuation value for a second FCU ESC; and (b) incrementing (709) synchronously the second FCU ESC and the PCU ESC, starting from the continuation value and beginning at the time of hand-off completion.
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