Terminal control device and method for soft-handoff between terminals having different frequencies
US6353603B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1998 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Jul 22, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7117
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for providing a soft handoff between base stations using different operating frequencies. The apparatus includes a RAKE receiver having a plurality of main paths and an extra path, a first local oscillator for the main paths and a second local oscillator for the extra path. When the apparatus is located between two base stations using the different frequencies, both the first and second local oscillators are enabled and communication with the target base station is established using a demodulation signal output from the extra path. Thereafter, as the apparatus moves into coverage of a target base station, the oscillation frequency of the first local oscillator is adjusted for the frequency of the target base station. Upon stabilization of the first local oscillator, the extra path is disabled and communication with the target base station is established using modulation signals output from the main paths of the RAKE receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.