MULTIPLE ACCESS TELECOMMUNICATION SYSTEM WITH ADAPTED PACKET-RETRANSMISSION STRATEGY

摘要

The invention relates to an OFDMA wireless telecommunication system that includes a transmitter (200) which uses an OFDM modulator (250) to transmit a plurality of data packets towards receivers (260) of a plurality of users via the same plurality of transmission channels, whereby the transmission channel of a user is associated with a group of sub-carriers of the OFDM multiplex and a set of OFDM symbol times of a transmission interval and each receiver can signal to the transmitter the loss of a packet transmitted on the transmission channel of the corresponding user. Moreover, the transmitter further includes a packet scheduler (210) capable of controlling the retransmission of each packet thus lost using the aforementioned modulator (250). Each receiver includes means (325) for detecting an outage in the transmission channel of the corresponding user and for signalling same to the transmitter using outage information (OUTAGE /NOUTAGE). In the event of an outage, the scheduler prohibits the retransmission of a packet lost on the channel during a predetermined time interval (T ou t) longer than or equal to the coherence time of said channel.