| 摘要 |
<p>A cellular radio system comprises a radio coverage area formed by a plurality of cells (C1, C2), each cell having at least one primary station (PS1, PS2) including a radio transceiver for communicating with a secondary station (SS1, SS2) when in its cell. The or each secondary station is able to roam within the radio coverage area. In order to facilitate call handover the secondary station informs the infrastructure (PS1, PS2, 10) of its velocity and the infrastructure uses knowledge of the velocity to make a decision regarding handing over a call-in-progress from one cell to another cell. The velocity information may be provided by a GPS receiver (18) carried by a vehicle in which the secondary station is located and the information is relayed to the secondary station by way of a short range radio system. The secondary station uses the cellular system to forward this information to the infrastructure.</p> |
