Forward link transmission mode for cdma cellular communications system using steerable and distributed antennas
CA 2276418 A1 · Owner: Telefonaktiebolaget Lm Ericsson · Inventors: Willars, Per
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A DS-CDMA cellular system (10) is provided that employs two forward link transmission modes (14, 16) in parallel. A conventional transmission mode (16) broadcasts a pilot channel that can be used by a conventional mobile station (22) to estimate and detect a dedicated traffic channel. The second transmission mode (14) transmits (via a sectorized or narrow lobe antenna system (18)) all information required by a new generation mobile station (22) to estimate and detect a traffic channel dedicated to that mobile station. Consequently, DS-CDMA system operators can introduce the use of adaptive array antenna systems (18) or distributed antenna systems with new generation mobile stations …
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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 December 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2019.
- 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.