Directional handover control in digital mobile radio systems employing MAHO
US5327575A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 1992 |
| Grant date | Jul 5, 1994 |
| Priority date | — |
| Expiry date | Mar 23, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/326
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of selecting handover targets for a communication unit exchanging a communicated signal through a serving base site in a digital cellular system. The method uses timing advance to determine a relative distance of a communication unit to the serving base site. The method comprising the steps of comparing a timing advance value with a first threshold. The first threshold may be equal to a distance one and one-half times the radius of the serving cell. When the timing advance value exceeds the first threshold, a base site frequency list is modified to include base sites non-adjacent the serving base site. The identity of the non-adjacent base sites may be determined from the directionality of the communication unit. The method further includes the step of selecting a handover target providing a highest relative RSSI value to the communication unit from the modified base site frequency list.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.