Radio communication system and communication terminal equipments thereof
US5852767A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1996 |
| Grant date | Dec 22, 1998 |
| Priority date | — |
| Expiry date | Apr 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W60/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
First and second radio communication units communicate using the frequency band of an existing microwave transmission system. A judgment whether the first communication unit is within communication range is performed based on information specifying the position of a base station of another radio communication system which is obtained therefrom. If found to be within communication range, the first communication unit shifts to a state and transmits a registration message to the second communication unit, which is then shifted to a transmission state. Interference in the existing microwave transmission system is prevented with a simple construction and without adding a circuit for confirming the present position of a communication unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.