Soft handoff for OFDM
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United States of America Patent
Stats
-
May 9, 2006
Grant Date -
N/A
app pub date -
Mar 22, 2002
filing date -
Mar 22, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention relates to soft handoffs in an OFDM system. Each mobile terminal measures pilot signal strengths of transmissions from adjacent base stations. If the pilot signal strength for a base station exceeds the defined threshold, that base station is added to an active set list. Each mobile terminal notifies the base stations of their active set lists. By providing the set list to the base station controller and the servicing base station, the mobile terminal identifies the sole servicing base station or triggers a soft handoff mode when multiple base stations appear on the active set list. The soft handoff mode uses a combination of scheduling and space-time coding to affect efficient and reliable handoffs.
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