Devices and system for transmitting and receiving wireless stream

A device for transmitting data, the device comprising:

• an encoder configured to:
• generate a compressed bitstream by encoding input media;
• generate additional information about the compressed bitstream;
• and
• generate a data stream (DS) comprising the additional information and the compressed bitstream, wherein the additional information comprises at least one class information indicating an importance of the compressed bitstream;
• and
• a DS transmitter configured to:
• generate a packet by packing the data stream;
• transmit a plurality of packets including the generated packet to a reception device;
• and
• retransmit at least some of the plurality of packets due to transmission error, wherein the retransmitted packets are identified based on at least corresponding class information.

A method for transmitting data, the method comprising:

• generating a compressed bitstream by encoding input media;
• generating additional information about the compressed bitstream;
• generating a data stream (DS) comprising the additional information and the compressed bitstream, wherein the additional information comprises at least one class information indicating an importance of the compressed bitstream;
• generating a packet by packing the data stream;
• transmitting a plurality of packets including the generated packet to a reception device;
• and
• retransmitting at least some of the plurality of packets due to transmission error, wherein the retransmitted packets are identified based on at least corresponding class information.

A device for receiving data, the device comprising:

• a data stream (DS) receiver configured to:
• receive a plurality of packets from a transmission device;
• determine whether to request retransmission of a packet of the plurality of packets based on at least one class information of the packet when the packet is not properly received due to a transmission error;
• a decoder configured to:
• perform decoding using a previously received packet, a packet previously dropped due to a transmission error, or a packet received following a retransmission request;
• and
• output a data stream comprising a compressed bitstream and class information indicating importance of the compressed bitstream obtained by decoding the packet.

A method for receiving a wireless stream, the method comprising:

• receiving a plurality of packets from a transmission device;
• determining whether to request retransmission of a packet of the plurality of packets based on at least one class information of the packet when the packet is not properly received due to a transmission error;
• performing decoding using a previously received packet, a packet previously dropped due to a transmission error, or a packet received following a retransmission request;
• and
• outputting a data stream comprising a compressed bitstream and class information indicating importance of the compressed bitstream obtained by decoding the packet.