Selective call system interactive with a wide area selective call system
US5355126A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1992 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Jul 27, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/022
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An on-site selective call receiver interacts with a wide area selective call system to increase the probability of timely message reception by a selective call receiver capable of operating in either the wide area or the on-site selective call system. A frequency shifting signal is transmitted from the wide area system in response to addition of the selective call receiver to the on-site registry or automatic detection of entry of the selective call receiver into the on-site selective call system coverage area. The selective call receiver shifts to the wide area frequency in response to detecting that the receiver is out of range of the on-site system signal or in response to a signal transmitted by the on-site system in response to deletion of the receiver from the on-site registry or detection of the exit of the receiver from the on-site coverage area. The on-site system increases message throughput by interleaving data messages with voice messages. The messages broadcast for the selective call receiver by the wide area system are rebroadcast by the on-site system. The messages broadcast by the on-site system, if data messages, are provided to the wide area system for rebroadcast…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.