Systems and methods for implementing wide annular cdma cells
CA 2395983 C · Owner: Nortel Networks Corporation · Inventors: Ren, Hong; Islam, Muhammad Khaledul; Plestid, Thomas Leonard Trevor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods and apparatuses are provided for CDMA (code division multiple access) access availability to a large cell area and for traffic channel , establishment. A group of cell site modems are configured to lock for access attempts generated in respective complete and/or sectorized circular or annular shaped areas centred at the centre of the cell area the areas , collectively covering the cell area. To achieve this each cell site modem has , a local clock and the local clock within the first of the cell site modems is synchronized with a standard network time and the local clock of each of the , subsequent cell site modems is offset by a respective delay with respect to the standard …
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 22, 2000 and granted January 8, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2022.
- 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.