Method and apparatus for handing-over a radio connection from one radio cell to another radio cell of a digital radio transmission system
US4765753A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1987 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Mar 3, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/0085
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Base radio stations are spatially arranged in a radio transmission system in accordance with a cellular system, separating the message transmission channels from adjacent base stations being effected either by using the frequency-division multiplex method or by using the code-division multiplex method or by using a combination of these multiplex methods. In appropriately large spatial distances the same set of channels can be repeated in a further radio cell. If a mobile radio station moves during the conversation from one radio cell into another, then it is necessary to hand-over the then existing radio connection. To avoid the necessity of using additional receivers in each base station and to prevent a repeated hand-over in the event of high co-channel interferences, the measurements used for hand-over decision are effected in the mobile radio station. As part of the method the reception quality of the co-channel message transmission channels of remote base stations are additionally measured in the mobile station during the existence of a radio connection to a near base station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.