Method and apparatus for enhancing signalling reliability in a cellular mobile radio telephone system
CA 2048490 C · Owner: Ghisler, Walter · Inventors: Dahlin, Steinar Jan Erik Ake; Ghisler, Walter; Kallin, Harald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for achieving reliable transmission of signalling messages in a cellular system in which the frequency plan, frequency/time slot allocation plan, code channel allocation plan or, dynamic/adaptive channel allocation rule of the system is violated by allowing adjacent base stations to reuse particular frequencies/time slots/channels for signalling a particular mobile station. In situations where signalling messages, such as handoff commands which are, communicated between a base station and a mobile station are not properly received by the mobile station an, alternate communications channel will be established to ensure the reception of these messages. The alternate …
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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 August 6, 1991 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2013.
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Timeline
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.