Transmission and reception of signals in a communication systems
US5974319A · kind A · utility
23Cited by
18References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Nov 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A dual-mode mobile station (125) transmits an AMPS signal (Td AMPS) concurrently during transmission of a DS CDMA signal (Td DS CDMA) for purposes of handoff of the mobile station from the DS CDMA system to AMPS. Scanning receivers (221) at surrounding AMPS base-stations (135-138) measure the quality of the AMPS signal (Td AMPS) and determine the best base-station for handoff. To ensure a strong signal during concurrent transmission, other mobile stations not undergoing handoff are instructed to notch their transmissions during transmission by mobile station (125) of the AMPS signal (Td AMPS).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.