Soft handoff in a cellular telecommunications system
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United States of America Patent
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Feb 24, 1998
Grant Date -
N/A
app pub date -
Jun 14, 1996
filing date -
Sep 24, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A soft handoff in a cellular telecommunications system in which a user mobile station relays user communication radio signals via at least two base stations to and from a controlling mobile exchange connected to another system user. The relay of user information signals is performed by using digital frames carried on digital transmission connections in the uplink and downlink directions. The differential delay of the two or more terrestial routes between the base stations and the exchange is compensated by a novel time alignment procedure. Each of the base stations sends time alignment request to the mobile exchange which performs the frame time alignment of the downlink transmissions by taking into account TA requests from all base stations.
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