Invention Grant
- Patent Title: Soft handoff for OFDM
- Patent Title (中): OFDM的软切换
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Application No.: US12343866Application Date: 2008-12-24
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Publication No.: US07864735B2Publication Date: 2011-01-04
- Inventor: Jianglei Ma , Ming Jia , Peiying Zhu , Wen Tong , Dong-Sheng Yu
- Applicant: Jianglei Ma , Ming Jia , Peiying Zhu , Wen Tong , Dong-Sheng Yu
- Applicant Address: CA Mississauga, Ontario
- Assignee: Nortel Networks Limited
- Current Assignee: Nortel Networks Limited
- Current Assignee Address: CA Mississauga, Ontario
- Agency: Withrow & Terranova, PLLC
- Main IPC: H04W4/00
- IPC: H04W4/00

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.
Public/Granted literature
- US20090103494A1 SOFT HANDOFF FOR OFDM Public/Granted day:2009-04-23
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