# US 10,374,668 B2 · Method and apparatus for transmitting and receiving data in a MIMO system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,374,668 B2 - Document ID: US10374668B2 - Status: Granted - Kind: B2 - Application number: 15/897,986 - Filed: 2018-02-15 - Published: 2018-06-21 - Granted: 2019-08-06 - Earliest claimed: 2010-03-12 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Jong-Ee Oh; Minho Cheong; Sok-Kyu Lee - Web page: https://patentgrep.com/patent/US10374668B2 ## CPC - H04B 7/0452: Multi-user MIMO systems - 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)} - H04B 7/0413: MIMO systems - H04L 1/0643: {block codes} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - 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)} - 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) - 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 transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently. ## Claims ### Claim 1 A wireless communication method, comprising: determining a bandwidth of a transmission channel; receiving a first control field through the transmission channel, wherein the first control field comprises a first set of bits and the first set of bits indicates a length of user data; and receiving a data field comprising the user data through the transmission channel, wherein a number of bits of the first set of bits is determined based on the bandwidth of the transmission channel. ### Claim 2 (depends on 1) The method of claim 1, wherein the first control field consists of the first set of bits, a second set of reserved bits and a third set of tail bits in sequence. ### Claim 3 (depends on 2) The method of claim 2, wherein the bandwidth of the transmission channel is 20 MHz, the number of bits of the first set of bits is seventeen (17) bits, a number of bits of the second set of reserved bits is three (3) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 4 (depends on 2) The method of claim 2, wherein the bandwidth of the transmission channel is 40 MHz, the number of bits of the first set of bits is nineteen (19) bits, a number of bits of the second set of reserved bits is two (2) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 5 (depends on 2) The method of claim 2, wherein the bandwidth of the transmission channel is 80 MHz, the number of bits of the first set of bits is twenty-one (21) bits, a number of bits of the second set of reserved bits is two (2) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 6 (depends on 1) The method of claim 1, wherein the first control field is a Very-High-Throughput Signal-B (VHT-SIG-B) field and the first control field comprises two consecutive orthogonal frequency-division multiplexing (OFDM) symbols. ### Claim 7 (depends on 1) The method of claim 1, further comprising: determining the length of the user data based on the first set of bits; and obtaining the user data based on the length of the user data. ### Claim 8 A wireless communication apparatus, comprising: a memory; and a processor operably coupled to the memory, wherein the processor, when executing program instructions stored in the memory, is configured to: determine a bandwidth of a transmission channel; cause the apparatus to receive a first control field through the transmission channel, the first control field comprising a first set of bits and the first set of bits indicating a length of user data; and cause the apparatus to receive a data field comprising the user data through the transmission channel, wherein a number of bits of the first set of bits is determined based on the bandwidth of the transmission channel. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the first control field consists of the first set of bits, a second set of reserved bits and a third set of tail bits in sequence. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the bandwidth of the transmission channel is 20 MHz, the number of bits of the first set of bits is seventeen (17) bits, a number of bits of the second set of reserved bits is three (3) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the bandwidth of the transmission channel is 40 MHz, the number of bits of the first set of bits is nineteen (19) bits, a number of bits of the second set of reserved bits is two (2) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein the bandwidth of the transmission channel is 80 MHz, the number of bits of the first set of bits is twenty-one (21) bits, a number of bits of the second set of reserved bits is two (2) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 13 (depends on 8) The apparatus of claim 8, wherein the first control field is a Very-High-Throughput Signal-B (VHT-SIG-B) field and the first control field comprises two consecutive orthogonal frequency-division multiplexing (OFDM) symbols. ### Claim 14 (depends on 8) The apparatus of claim 8, wherein the processor is further configured to: determine the length of the user data based on the first set of bits; and obtain the user data based on the length of the user data. ### Claim 15 A communication device for a station, the device comprising: a memory; and a processor operably coupled to the memory, wherein the processor, when executing program instructions stored in the memory, is configured to: determine a bandwidth of a transmission channel; cause the station to receive a first control field through the transmission channel, the first control field comprising a first set of bits and the first set of bits indicating a length of user data; and cause the station to receive a data field comprising the user data through the transmission channel, wherein a number of bits of the first set of bits is determined based on the bandwidth of the transmission channel. ### Claim 16 (depends on 15) The device of claim 15, wherein the first control field consists of the first set of bits, a second set of reserved bits and a third set of tail bits in sequence. ### Claim 17 (depends on 16) The device of claim 16, wherein the bandwidth of the transmission channel is 20 MHz, the number of bits of the first set of bits is seventeen (17) bits, a number of bits of the second set of reserved bits is three (3) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 18 (depends on 16) The device of claim 16, wherein the bandwidth of the transmission channel is 40 MHz, the number of bits of the first set of bits is nineteen (19) bits, a number of bits of the second set of reserved bits is two (2) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 19 (depends on 16) The device of claim 16, wherein the bandwidth of the transmission channel is 80 MHz, the number of bits of the first set of bits is twenty-one (21) bits, a number of bits of the second set of reserved bits is two (2) bits, and a number of bits of the third set of tail bits is six (6) bits. ### Claim 20 (depends on 15) The device of claim 15, wherein the first control field is a Very-High-Throughput Signal-B (VHT-SIG-B) field and the first control field comprises two consecutive orthogonal frequency-division multiplexing (OFDM) symbols. ### Claim 21 (depends on 15) The device of claim 15, wherein the processor is further configured to: determine the length of the user data based on the first set of bits; and obtain the user data based on the length of the user data.