Method of establishing a communication link in a digital cordless telephone system
US5583854A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1995 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Apr 4, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital time-division duplex radio communication link is established or re-established between one of a plurality of portable units and one or more base units forming a cordless telephone system, so as to avoid potential interference created by the use of an unsynchronized call-up transmission in the presence of synchronized signals being exchanged by the rest of the system. The call-up transmission is pre-synchronized with the rest of the system so that switchovers between transmission bursts and reception windows occur at the same time as between the call-up signal and the rest of the system. This is achieved by deriving synchronization information from a synchronization signal which may, for example, be an existing signal on the system containing synchronization information (i.e., an existing call on the system) or may be a beacon signal which, in some systems, is transmitted by the fixed units for the purpose of range indication. The method is particularly applicable to the MUX1/MUX2/MUX3 format of signals used in the CT2 common air interface protocol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.