Invention Grant
- Patent Title: High precision access point to access point synchronization in an indoor position location system
- Patent Title (中): 高精度接入点在室内定位系统中的接入点同步
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Application No.: US14042446Application Date: 2013-09-30
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Publication No.: US09363776B2Publication Date: 2016-06-07
- Inventor: Alok Kumar Gupta , William E. Stein , Scott Howard King
- Applicant: QUALCOMM Incorporated
- Applicant Address: US CA San Diego
- Assignee: QUALCOMM Incorporated
- Current Assignee: QUALCOMM Incorporated
- Current Assignee Address: US CA San Diego
- Agency: Holland & Hart LLP
- Main IPC: H04W56/00
- IPC: H04W56/00 ; H04B7/26

Abstract:
Methods, systems, and devices are described that provide for high precision synchronization between pairs of APs within a tracking area of a position location network. These tools and techniques may provide for incrementally synchronizing timers and oscillators located at respective APs. An AP may transmit a course frequency and timing acquisition signal that a second AP utilizes to estimate a frequency offset and/or time offset. The AP may transmit a subsequent fine frequency and timing acquisition signal which may be used to accurately adjust the estimated frequency offset and/or time offset of the second AP. The second AP may thus incrementally synchronize its oscillator(s) and/or timer(s). These techniques may be utilized over a multi-hop wireless network. The methods, systems, and devices may be applicable to single- and multi-floor location tracking systems.
Public/Granted literature
- US20150092753A1 HIGH PRECISION ACCESS POINT TO ACCESS POINT SYNCHRONIZATION IN AN INDOOR POSITION LOCATION SYSTEM Public/Granted day:2015-04-02
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