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Remote Detection of Clock Frequency Errors in Cellular Infrastructure Equipment.

IP.com Disclosure Number: IPCOM000019176D
Original Publication Date: 2003-Sep-03
Included in the Prior Art Database: 2003-Sep-03

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Neil Turner


This paper describes two methods of detecting when the frequency accuracy of a cellular base station has gone out of specification. Firstly, other infrastructure equipment can be used to detect the transmissions and determine when one is out of specification. Where this is not feasible due to the effects of the cellular plan, mobiles can be used to determine the frequency accuracy of the base using the frequency correction channel (or equivalent). The information can be used to identify any base stations with inaccurate frequency references, and these can be recalibrated on-site only when necessary, reducing the requirement for regular site visits. Providing sufficient accuracy can be guaranteed, the system can be extended to provide remote frequency calibration.