Method of handing over a call set up with a mobile station from one cell to another within a cellular radio network
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Apr 24, 1997
filing date -
Oct 26, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The safe method of handing over a call set up with a mobile station (M) comprise the following cyclic steps: a following base station (B(n)) receives (ET3) UP data (DM) of the call in a following channel (CH2), which UP data is transmitted by the mobile station (M) in a current channel (CH1) to a current base station; the DOWN data of the call is transmitted (ET5) for a given duration (T) simultaneously both over said current channel (CH1) and over said following channel (CH2), from the current base station (B(n-1)) and from the following base station (B(n)) respectively as soon (ET4) as the propagation time difference (TA) between the respective instants at which said UP data is received by said current channel (CH1) and by said following channel (CH2) is less than a first predetermined threshold (S); and on expiry of said given duration (T), releasing (ET6, LIB) said call in said current channel, and validating said call in the following channel (CH2) as a new current channel.
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