The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 1995
Filed:
Jul. 13, 1994
Nigel E Barnes, Stapleford, GB;
Brian A Bidwell, Luton, GB;
Andrew Bud, Ivrea, IT;
Malcolm Crisp, Over, GB;
Michael T Dudek, Agoura, CA (US);
Rupert Goodings, Cambridge, GB;
David C Odhams, Epping, GB;
Peter N Proctor, Lychpit, GB;
Ian Rodgers, Southport, GB;
British Telecommunications Public Limited Company, London, GB;
Kenwood Corporation, Tokyo, JP;
GPT Limited, Coventry, GB;
Orbitel Mobile Communications Limited, Newbury, GB;
AT&T Wireless Communications Products Limited, Winchester, GB;
Northern Telecom Limited, Montreal, CA;
Abstract
A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station 3 using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronisation logical channel S and a signalling logical channel D multiplexed together, but the link may switch to bursts carrying a communications logical channel B for the speech data and the signalling logical channel D. Burst synchronisation is achieved by the asynchronous detection of words in a synchronisation channel S. These words have bit patterns reducing the probability of incorrect asynchronous detection of them. If one part ceases to receive handset signals from the other, it transmits a special signal, informing the other part. This enables both parts to detect the failure of a link at substantially the same time, so that their actions to re-establish the link are synchronised.