Group communication system having group number specified by mobile unit to permit intergroup calls
US7096018B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 2003 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Dec 27, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a group communication system, a mobile station that is not currently under a group communication can participate in a group communication. A location registration signal is transmitted to a base station upon turning on the power of a mobile station or when a mobile station moves between communication zones A group communication number is sent from the mobile station and is examined against a group-communication group number controlling register in a control station The examination determines the presence or absence of a group communication call corresponding to the group-communication number sent by the mobile station Notification information on a relevant call, if present, is sent to the mobile station, which can then participate in the group communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.