Invention Grant
- Patent Title: Cell timing acquisition in a W-CDMA hard handover
- Patent Title (中): W-CDMA硬切换中的小区定时采集
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Application No.: US12239027Application Date: 2008-09-26
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Publication No.: US08139542B2Publication Date: 2012-03-20
- Inventor: Brian Dong , Messay Amerga , Supratik Bhattacharjee , Xiaoming Zhu
- Applicant: Brian Dong , Messay Amerga , Supratik Bhattacharjee , Xiaoming Zhu
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agent Kevin T. Cheatham
- Main IPC: H04W4/00
- IPC: H04W4/00

Abstract:
Cell timing is detected by first trying to detect a target handover cell through detecting a primary synchronization channel (P-SCH) followed by a common pilot channel (CPICH). If that fails, N number of retrials is performed using a full-window search on the CPICH. The full-window CPICH search is performed blindly, without any slot timing information from the P-SCH. Performance is improved while maintaining the benefits of faster acquisition methods in good channel conditions. The full-window search is more time consuming, but takes advantage of the stronger CPICH transmission. In good channel conditions, a mobile device can proceed quickly with the normal method of timing acquisition. With failure, the mobile device can switch to the longer search which has a higher probability of successfully completing the hard handover procedure. The overall effect is a higher success rate of hard handovers without a uniform increase of time spent in cell timing acquisition.
Public/Granted literature
- US20100080192A1 CELL TIMING ACQUISITION IN A W-CDMA HARD HANDOVER Public/Granted day:2010-04-01
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