Method and apparatus for measurement directed hard handoff in a CDMA system
US5917811A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1996 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | May 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/0085
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a communications network, a network user communicates using a remote unit with another user via at least one base station. The network is comprised of first and second mobile switching control stations respectively controlling communications through a first set of base stations including a first base station and through a second set of base stations including a second base station. To direct communications between the remote unit and the first and second base stations the first base station measures a round trip delay of an active communication signal between the first base station and the remote unit. The remote unit measures a first phase offset of a pilot signal received from a first candidate base station and reports it to the first mobile switching center via the first base station. The first mobile switching center calculates a candidate round trip delay between the remote unit and the first candidate base station based on the first phase offset and the round trip delay of the active communication signal. A active communication control unit accesses a measurement directed hard handoff table to determine a location of the remote unit based on the round trip delay correspond…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.