Triggering handdowns and handoffs of mobile stations between bordering cells of cellular wireless communication systems
US6771963B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1998 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Aug 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/0058
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A procedure for triggering a handdown or a handoff a mobile station served by a base station of a cellular wireless communication system. A tolerable path loss for signal links between the base station and a mobile station located within the base station's cell, is initially determined. A control signal is radiated at a known transmit power level from the base station over its cell. A receive power level threshold is determined for the control signal for reception by the mobile station, according to the transmit power level and the tolerable path loss. A handoff of the mobile station is triggered after deriving the received power level of the control signal at the mobile station, and determining that the received power level is less than the receive power level threshold. In one embodiment, a mobile station reports to a serving base station only after the former determines that the received power level of a control signal from the base station is less than a threshold level initially provided to the mobile station by the base station. The procedure is applicable, e.g., to base station cells of a first CDMA cellular system which cells border on cells of an analog (AMPS) or a second …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.