# US 2021/0243644 A1 · Devices and system for transmitting and receiving wireless stream > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243644 A1 - Document ID: US20210243644A1 - Status: Published application - Kind: A1 - Application number: 16/631,401 - Filed: 2019-05-07 - Published: 2021-08-05 - Earliest claimed: 2019-03-29 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sangheon LEE; Yoonjung KIM; Jonghun YOO; Jaehyeok LEE; Taeil CHUNG - Web page: https://patentgrep.com/patent/US20210243644A1 ## CPC - H04L 65/80: Responding to QoS - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 65/61: for supporting one-way streaming services, e.g. Internet radio - H04L 65/70: Media network packetisation - H04L 65/762: {at the source (reformatting of additional data in video distribution servers H04N21/2355)} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The disclosure relates to a device for transmitting a data stream and a device for receiving a data stream. Disclosed is a device for transmitting a data stream including: 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) including the additional information and the compressed bitstream, wherein the additional information includes 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. ## Claims ### Claim at position 1 1-20. (canceled) ### Claim 21 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. ### Claim 22 (depends on 21) The device of claim 21, wherein the importance of the compressed bitstream of the retransmitted packets is higher than the importance of the compressed bitstream of the packets of the plurality of packets which are not retransmitted. ### Claim 23 (depends on 21) The device of claim 21, wherein the DS further comprises at least identification information for identifying the compressed bitstream and the additional information or information about an offset position at which the additional information is positioned in the DS. ### Claim 24 (depends on 21) The device of claim 21, wherein: the compressed bitstream is divided into a plurality of regions; class information is generated for each region and indicates an importance of each region; and the additional information further comprises information about an offset position from which each region starts in the compressed bitstream. ### Claim 25 (depends on 21) The device of claim 21, wherein the data stream is ordered by the encoder or the DS transmitter such that compressed bitstreams having the same class are aligned together. ### Claim 26 (depends on 21) The device of claim 21, wherein the DS transmitter is further configured to generate the packet by sequentially packing the data stream according to a fixed packet size. ### Claim 27 (depends on 21) The device of claim 21, wherein the DS transmitter is further configured to determine a particular wireless channel for transmitting the packet among a plurality of wireless channels based the class information. ### Claim 28 (depends on 21) The device of claim 21, wherein the DS transmitter is further configured to transmit the additional information before transmission of the compressed bitstream. ### Claim 29 (depends on 21) The device of claim 21, wherein the encoder is further configured to generate information about an offset position at which the additional information is updated in the data stream, and the DS transmitter is further configured to transmit the information about the offset position at which the additional information is updated. ### Claim 30 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. ### Claim 31 (depends on 30) The method of claim 30, wherein the importance of the compressed bitstream of the retransmitted packets is higher than the importance of the compressed bitstream of the packets of the plurality of packets which are not retransmitted. ### Claim 32 (depends on 30) The method of claim 30, wherein the DS further comprises at least identification information for identifying the compressed bitstream and the additional information or information about an offset position at which the additional information is positioned in the DS ### Claim 33 (depends on 30) The method of claim 30, wherein: the compressed bitstream is divided into a plurality of regions; class information is generated for each region and indicates an importance of each region; and the additional information further comprises information about an offset position from which each region starts in the compressed bitstream. ### Claim 34 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. ### Claim 35 (depends on 34) The device of claim 34, wherein the DS receiver is further configured to transmit a signal requesting retransmission of the packet wherein the importance of the compressed bitstream of the packet is higher than the importance of the compressed bitstream of the packets of the plurality of packets which are not requested to be retransmitted. ### Claim 36 (depends on 34) The device of claim 34, wherein the data stream further comprises at least identification information for identifying the compressed bitstream and the additional information or information about an offset position at which the additional information is positioned in the DS. ### Claim 37 (depends on 34) The device of claim 34, wherein: the compressed bitstream is divided into a plurality of regions; class information is generated for each region and indicates an importance of each region, and the additional information further comprises information about an offset position from which each region starts in the compressed bitstream. ### Claim 38 (depends on 34) The device of claim 34, wherein the data stream is ordered such that compressed bitstreams having the same class are aligned together. ### Claim 39 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. ### Claim 40 (depends on 39) The method of claim 39, wherein the importance of the compressed bitstream of the packet requested to be retransmitted is higher than the importance of the compressed bitstream of the packets of the plurality of packets which are not requested to be retransmitted.