Seamless hand-off for air-to-ground systems
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United States of America Patent
Stats
-
May 21, 2002
Issued Date -
N/A
app pub date -
May 26, 1995
filing date -
Mar 26, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Seamless hand-off of air-to-ground telephony calls is achieved autonomously within an aircraft by using one of at least two radio links to search for additional ground stations. The search for candidate ground stations for hand-off is expedited by eliminating ground stations exhibiting zero or negative Doppler effects. Other values indicating quality of the link corresponding to the channel over which the search is conducted is compared with the quality of the call and an alternate call is established using the call identification code previously established for the call in progress. The hand-off of the call may then be easily conducted by transferring the voice signal to the channel over which the search was conducted. This is preferably done at a time when the transmission quality of the two channels would be approximately the same or the quality improved on the channel to which hand-off is made.
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