Method for utilizing negative T--COMP to improve handoff reliability
US6233455A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | May 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/18
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A pre-determined negative constant is utilized in soft handoff mode to permit a new pilot signal to be added to an wireless phone's active set. The negative constant is combined with the weakest pilot signal in the active set and then compared to the new pilot signal strength which allows the new pilot to trigger a Pilot Strength Measurement Message (PSMM) even when the new pilot signal is weaker than all active set pilot signals. The negative constant provides a soft handoff while maintaining or reducing drop rate probabilities and frame error rates. After initially triggering a PSMM, the next instance the new pilot may ordinarily cause a PSMM to be triggered is when the new pilot signal exceeds the strongest active set pilot signal. Triggering a PSMM when exceeding the strongest active set signal may increase the probability of dropped signals. To reduce the probability of dropped signals, a negative constant is utilized during soft handoff to add a new pilot to an active set. This step would also decrease the probability that the new pilot will overpower a weaker active set pilot signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.