Method and device for low latency group-addressed streaming

A device for low latency group-addressed streaming, the device being operable as an access point in an IEEE 802.11 wireless network, the network further comprising a plurality of wireless receiving stations and the plurality of wireless receiving stations comprising a first and a second set of wireless receiving stations, wherein the first set comprises wireless receiving stations that are not in a power saving mode and the second set comprises wireless receiving stations that are in a power saving mode, the device comprising:

• a transmitter adapted to wirelessly transmit a data stream to the plurality of wireless receiving stations as multicast traffic using a group address, the data stream comprising beacon frames at beacon intervals, wherein the transmitter transmits data packets of the data stream that comprise the group address to the first set of wireless receiving stations as multicast traffic as soon as the data packets arrive at the device and before transmitting a first beacon frame;
• and
• a detector adapted to automatically detect for at least one of the wireless receiving stations of the second set of wireless receiving stations being addressed by said group address that it is in power saving mode or sleep mode,
• wherein the transmitter is further adapted to repeat the transmission of said data packets as multicast traffic to the wireless receiving stations of said second set immediately after transmission of the first beacon frame, wherein the wireless receiving stations of the second set addressed by said group address are awake from the power saving mode or sleep mode after the first beacon frame and are able to receive the re-transmitted data packets, the first beacon frame being a next beacon frame that comprises a Delivery Traffic Information Map (DTIM) message.