Idle intersystem roaming determination and system reselection in a CDMA wireless communication system
US6625132B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1998 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Nov 13, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A wireless communication system and a mobile station employ at least one threshold to evaluate the quality of transmissions from a serving base station to determine when the mobile station enters a Dead Zone adjacent a border cell of the system. Such thresholds not only consider the ratio of carrier energy (Ec) to interference (Ec/Io) but also consider the energy of the carrier itself. When the relevant measured (or calculated) carrier energy Ec and/or carrier energy to interference ratio Ec/Io are passed, the mobile station performs system reselection, attempting to acquire a different system/carrier. The thresholds employed may be passed from the base station to the mobile station in the System Parameters message, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.