Technique for time-division duplex cordless telecommunication
US5228026A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Nov 26, 1990 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Nov 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/041
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station using alternating bursts of transmission over a single radio channel. Once a radio link has been set up, initial transmissions carry a synchronization 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 synchronization is achieved by the asynchronous detection of words in a synchronization 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 synchronized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.