Soft handoff for OFDM

Details Soft handoff for OFDM Soft handoff for OFDM

2006-05-09

2006-05-09

Patel, Ajit (Department: 2664)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S208000, C370S343000

Reexamination Certificate

active

07042858

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.

REFERENCES:
patent: 2002/0154705 (2002-10-01), Walton et al.
patent: 2003/0072255 (2003-04-01), Ma et al.
patent: 2004/0057530 (2004-03-01), Tarokh et al.
patent: 2004/0066866 (2004-04-01), Tong et al.
patent: 0 902 551 (1999-03-01), None
patent: 1 187 503 (2002-03-01), None

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