Method and apparatus for providing wireless communication system synchronization
CA 2737848 C · Owner: Qualcomm Incorporated · Inventors: Howard, Steven J.; Wallace, Mark S.; Tiedemann, Edward G. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
When insufficient traffic is present in the network to maintain synchronization in this manner other methods must be used. One approach involves making direct measurements of the timing between base stations (602 604). This is accomplished in one of two ways. The base may interrupt its transmissions on all sectors for a short interval during which it determines the time of arrival of signals from other base stations (602 604). Given knowledge of the other base station locations time errors relative to all other base stations (602 604) may be derived. Alternatively, the base may send a short signal at high power in the mobile transmit band. This time-of-arrival of this signal is measured by …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed December 3, 1999 and granted November 13, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.