Wireless communication system

A central communication unit arranged to communicate wirelessly during successive communication cycles (C1, C2, C3) with a plurality of subscriber communication units, the central communication unit comprising:

• transmitter means arranged, during each communication cycle, to transmit a single global downlink frame addressed to all of the subscriber communication units, the global downlink frame comprising a plurality of data packets, each addressed to a respective one of the subscriber communication units, the global downlink frame supplying a common reference time to all of the subscriber communication units so that, after receiving the global downlink frame, each subscriber communication unit can start transmitting an uplink frame at the end of a waiting interval starting at the common reference time and having a duration equal to a respective waiting duration that is associated with said subscriber communication unit, the waiting durations all being different and being defined in such a manner as to avoid collisions between the uplink frames;
• and
• receiver means arranged, during said communication cycle, to receive in succession the uplink frames transmitted by each of the subscriber communication units.