Environmental adaptive mechanism for channel utilization in cordless telephones
US5418839A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1993 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Mar 22, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cordless telephone has an improved mechanism for scanning and selecting channels by adapting to the channel usage patterns of the local environment having a plurality of channels available for usage. A prioritized list of channels having the highest probability of being interference free is produced. The channels are prescanned during idle time, so quick acquisition of an available channel is possible. Accordingly to another feature, a scan subset comprising a first group of clear channels is selected upon system powerup. The available channels are scanned during the idle time to select a preferred channel subset which comprises channels which are the most interference free. A channel or channels within the preferred channel subset which experience no or little interference over an extended period of time then is assigned to a clear channel subset. The clear channel subset includes fewer channels than the preferred channel subset. Communication is carried out over a channel in the clear channel subset. This technique is highly efficient for communicating in the clearest channel with the least amount of delay. Memory requirements are reduced and power consumption is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.