Method and apparatus for CDMA soft handoff for dispatch group members
US6882855B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 2003 |
| Grant date | Apr 19, 2005 |
| Priority date | — |
| Expiry date | Oct 5, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
To address the need to provide listening participants of CDMA dispatch services soft handoff signaling capability, the concept of “shared channel signaling windows” for shared traffic channels (e.g., 110) is described. In one embodiment, the base site (105) announces the beginning of a signaling window for the traffic channel, allowing remote units (e.g., MS 120) that need to send handoff signaling an opportunity. In response to such signaling, the base site directs soft handoff information to the signaling remote units via the traffic channel. However, all the remote units that share the traffic channel can store this soft handoff information and later use the information to initiate soft handoffs without needing to exchange handoff messaging with the base site. Thus, a CDMA-dispatch, shared-channel implementation is enabled by providing soft handoff signaling windows and the over-the-air, soft-handoff messaging required for dispatch services is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.