Technique for determining propagating and clear frequency to be used in wide area wireless data communications network
US5640442A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1996 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Sep 24, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/022
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A two-way communications system that provides ubiquitous wireless data communication services, such as throughout the continental United States, by using a network of only a few, widely distributed radio base station (RBS) sites and the existing paging network infrastructure. The paging network infrastructure is used as an outbound link to request data from the remote field units. The outbound page message indicates a time and HF frequency at which the RBSs can expect to receive inbound data from the field units. A network hub or mission operation center (MOC) determines a radio frequency which is expected to be propagating and clear at the time that a particular field unit is to use the frequency as an inbound link. The MOC then issues the request for data to the field unit using an existing inexpensive wireless system such as the paging network infrastructure. The field units make use of paging receivers, and an HF transmitter to report remote data such as a geoposition or other sensor data when requested to do so.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.