| 摘要 |
A communications system having units communicating in periodic bursts over a time divided channel is described. A periodic time window R is identified, repeating between peaks of activity Q on the channel, having a duration at least equal to the duration of a transmission burst. That time window is selected as a repeating time slot for transmission. In another aspect, bursts of transmission are received from a unit including traffic (for outputting) and signalling is transmitted to the unit in bursts interspersed between received bursts on the same channel, where the unit which is receiving traffic and transmitting signalling times the bursts transmitted according to the bursts received. In another aspect, a pre-emption requirement is relayed from a receiving unit which may be in range of a pre-empting unit to a transmitting unit which may not be in range of the pre-empting unit. <IMAGE> |
