| 摘要 |
<p>In a mobile radio system carrying at least one group call, each primary station carrying the call transmits the identities of other primary stations carrying that call embedded in the call itself. In a TDMA signal, these identities may be transmitted in a dedicated frame F, within a control slot C, during a ramp slot R or during an associated control slot AC. When the quality of a signal received by a mobile secondary station deteriorates, handover to the most appropriate alternative primary station may be effected quickly and without the need for a signalling exchange. The invention is also applicable to FDMA systems. <IMAGE></p> |
