Mobile station assisted soft handoff in a CDMA cellular communications system
US5640414A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1994 |
| Grant date | Jun 17, 1997 |
| Priority date | — |
| Expiry date | Apr 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/304
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a code division multiple access (CDMA) spread spectrum cellular communication system in which a mobile station user communicates with another system user via at least one base station, wherein each base station transmits a common pilot signal of a different code phase with respect to other base stations in said system, a method for directing communications between said mobile station user and said base stations. The mobile station monitors the signal strength of pilots and reports the measured signal strength to a system controller via the base station through which it is communicating. Command messages from the system controller to a new base station and the mobiles station establishes communication through the new base station in addition to the communication through the current base station. When the mobile station detects the falling below a predetermined level of the signal strength of a pilot corresponding to at least one of the base stations through which the mobile station is communicating, the mobile station reports the measured signal strength indicative of the corresponding base station to the system controller via the base stations through which it is communicating. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.