Handover management in group calls
US8014778B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2006 |
| Grant date | Sep 6, 2011 |
| Priority date | — |
| Expiry date | Nov 3, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/30
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mobile terminal of a digital cellular radiocommunication system that is in the receiving phase in a group call while roaming in a current cell, indicates to a fixed network element of the system, a given destination cell out of a number N of cells adjacent to the current cell. The system uses a time and/or frequency division multiple access method, and any modulation method. The mobile terminal sends an identification sequence of the destination cell in a time slot of an inbound signaling channel which is a contention channel. The identification sequence comprises a predetermined identification pattern out of a determined number P of identification patterns of different respective values, where P is an integer number such that 1<P≦N. The values of the P identification patterns are such that they correspond to mutually-orthogonal modulated signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.