| 摘要 |
<p>Audible effects of handover of a mobile subscriber station (M1, 22) in a digital cellular system are eliminated in either the uplink (UL) or the downlink (DL) by implementing discontinuous transmission (DTX) within the system on either or both of the links. A voice activity detector (VAD) monitors whether speech or non-transparent data is originating from a party and, if not, the transmission of that party is interrupted and only a single SID frame is sent during each SACCH period to update the background noise characteristics being generated at the other parties' receiver. Once it is determined by the system that a handover of a mobile needs to be performed (32), that handover is delayed until the party on the link on which DTX is implemented is neither talking nor sending non-transparent data (34) ensurin g that the other party is having comfort noise being generated in its receiver and, thus, will not hear any audible effect of the handover.</p> |
