# US 11,309,945 B2 · Method and apparatus for transceiving data > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,309,945 B2 - Document ID: US11309945B2 - Status: Granted - Kind: B2 - Application number: 16/813,777 - Filed: 2020-03-10 - Published: 2020-07-02 - Granted: 2022-04-19 - Earliest claimed: 2010-03-11 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Jae Woo Park; Jong Ee Oh; Il-Gu Lee; Sok-Kyu Lee; Min Ho Cheong; Jee Yon Choi; Jae Seung Lee; Yun Joo Kim - Web page: https://patentgrep.com/patent/US11309945B2 ## CPC - H04B 7/0452: Multi-user MIMO systems - H04B 7/0413: MIMO systems - H04L 1/0061: {Error detection codes} - H04L 1/0072: {Error control for data other than payload data, e.g. control data} - H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)} - H04L 1/0083: {Formatting with frames or packets; Protocol or part of protocol for error control} - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 27/18: Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence) - H04L 27/20: Modulator circuits; Transmitter circuits - H04L 69/22: Parsing or analysis of headers - H04L 1/0003: {by switching between different modulation schemes} - H04L 69/323: in the physical layer [OSI layer 1] - H04Q 2213/13215: Code checking, CRC - H04W 84/12: WLAN [Wireless Local Area Networks] - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention relates to a method and apparatus for transceiving data. A method in which a transmitting terminal transmits data to a receiving terminal in a MIMO system according to one embodiment of the present invention comprises the following steps: generating a data field containing the data; generating a signal field containing information on the data field; generating a data frame containing the data field and the signal field; and transmitting the data frame to the receiving terminal. According to the present invention, an end of the frame being transmitted is accurately notified to the receiving terminal in a communication system in which the frame is transmitted using MIMO, thereby decoding the frame in a more efficient manner at the receiving terminal. ## Claims ### Claim 1 A communication method, the method comprising: receiving, at a station, a first signal field; receiving, at the station, a second signal field after receiving the first signal field; receiving, at the station, a third signal field after receiving the second signal field; receiving, at the station, a data field after receiving the third signal field, wherein the data field comprises a service field and a data unit; obtaining, at the station, bits related to length of the data unit from the third signal field; obtaining, at the station, bits relating to a scrambler and cyclic redundancy check (CRC) bits from the service field; and descrambling the data unit at least based on the bits relating to the scrambler. ### Claim 2 (depends on 1) The method of claim 1, further comprising obtaining, at the station, bits relating to a total length of the first signal field, the second signal field, the third signal field, the service field and the data unit from the first signal field. ### Claim 3 (depends on 1) The method of claim 1, further comprising demodulating, at the station, the data unit at least based on modulation information in one of the second signal field and the third signal field. ### Claim 4 (depends on 1) The method of claim 1, wherein the CRC bits are calculated based on at least a part of the third signal field. ### Claim 5 (depends on 1) The method of claim 1, wherein the second signal field and the third signal field are modulated by Binary Phase Shift Keying (BPSK) modulation. ### Claim 6 (depends on 1) The method of claim 1, wherein the third signal field comprises first information on modulation and coding scheme used for the data field, and second information on a total number of bits for the data field. ### Claim 7 An apparatus comprising: a circuitry which is configured to: cause the apparatus to receive a first signal field; cause the apparatus to receive a second signal field after receiving the first signal field; cause the apparatus to receive a third signal field after receiving the second signal field; cause the apparatus to receive a data field after receiving the third signal field, wherein the data field comprises a service field and a data unit; obtain bits related to length of the data unit from the third signal field; obtain bits relating to a scrambler and cyclic redundancy check (CRC) bits from the service field; and descramble the data unit at least based on the bits relating to the scrambler. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the circuitry is further configured to obtain bits relating to a total length of the first signal field, the second signal field, the third signal field, the service field and the data unit from the first signal field. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein the circuitry is further configured to demodulate the data unit at least based on modulation information in one of the second signal field and the third signal field. ### Claim 10 (depends on 7) The apparatus of claim 7, wherein the CRC bits are calculated based on at least a part of the third signal field. ### Claim 11 (depends on 7) The apparatus of claim 7, wherein the second signal field and the third signal field are modulated by Binary Phase Shift Keying (BPSK) modulation. ### Claim 12 (depends on 7) The apparatus of claim 7, wherein the third signal field comprises first information on modulation and coding scheme used for the data field, and second information on a total number of bits for the data field. ### Claim 13 A device for a station, comprising: a circuitry which is configured to: cause the station to receive a first signal field; cause the station to receive a second signal field after receiving the first signal field; cause the station to receive a third signal field after receiving the second signal field; cause the station to receive a data field after receiving the third signal field, wherein the data field comprises a service field and a data unit; obtain bits related to length of the data unit from the third signal field; obtain bits relating to a scrambler and cyclic redundancy check (CRC) bits from the service field; and descramble the data unit at least based on the bits relating to the scrambler. ### Claim 14 (depends on 13) The device of claim 13, wherein the circuitry is further configured to obtain bits relating to a total length of the first signal field, the second signal field, the third signal field, the service field and the data unit from the first signal field. ### Claim 15 (depends on 13) The device of claim 13, wherein the circuitry is further configured to demodulate the data unit at least based on modulation information in one of the second signal field and the third signal field. ### Claim 16 (depends on 13) The device of claim 13, wherein the CRC bits are calculated based on at least a part of the third signal field. ### Claim 17 (depends on 13) The device of claim 13, wherein the second signal field and the third signal field are modulated by Binary Phase Shift Keying (BPSK) modulation. ### Claim 18 (depends on 13) The device of claim 13, wherein the third signal field comprises first information on modulation and coding scheme used for the data field, and second information on a total number of bits for the data field.