# US 10,313,077 B2 · Wireless communication method and wireless communication terminal for coexistence with legacy wireless communication terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,077 B2 - Document ID: US10313077B2 - Status: Granted - Kind: B2 - Application number: 15/854,662 - Filed: 2017-12-26 - Published: 2018-05-03 - Granted: 2019-06-04 - Earliest claimed: 2015-06-29 - Assignees: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd. - Applicants: Wilus Institute of Standards and Technology Inc. - Inventors: Geonjung Ko; Jinsam Kwak; Juhyung Son - Web page: https://patentgrep.com/patent/US10313077B2 ## CPC - H04L 1/0079: {Formats for control data (H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00)} - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0092: {Indication of how the channel is divided} - H04L 27/18: Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence) - H04L 27/2602: {Signal structure} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04L 27/2613: {Structure of the reference signals} - H04L 69/18: Multiprotocol handlers, e.g. single devices capable of handling multiple protocols - H04L 69/323: in the physical layer [OSI layer 1] - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)} - H04L 27/26132: {using repetition} - H04L 27/26136: {Pilot sequence conveying additional information} - H04W 80/045: {involving different protocol versions, e.g. MIPv4 and MIPv6} - H04W 84/12: WLAN [Wireless Local Area Networks] - 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 A wireless communication terminal for wireless communication is disclosed. The wireless communication terminal includes: a transceiver; and a processor. The processor is configured to transmit a non-legacy physical layer frame including a legacy signaling field including information decodable by a legacy wireless communication terminal by using the transceiver. ## Claims ### Claim 1 A wireless communication terminal that communicates wirelessly, the terminal comprising: a transceiver; and a processor, wherein the processor is configured to receive a non-legacy physical layer frame by using the transceiver, obtain a legacy signaling field including information decodable by a legacy wireless communication terminal from the non-legacy physical layer frame, obtain length information indicating information on a duration of the non-legacy physical layer frame, from the legacy signaling field, obtain information other than information on the duration of the non-legacy physical layer frame through a remaining value obtained by dividing the length information by a data size transmittable by a symbol of a legacy physical layer frame, wherein the data size transmittable by a symbol of the legacy physical layer frame is 3 octets when a data rate of the legacy physical layer frame is 6 Mbps, and determine the number of symbols of data of the non-legacy physical layer frame according to a following equation, N SYM = ⌊ ( L_LENGTH + m + 3 3 × 4 - T HE ⁢ ⁢ _ ⁢ ⁢ PREAMBLE ) / T SYM ⌋ - b PE ⁢ ⁢ _ ⁢ ⁢ Disambiguity where └x┘ denotes a largest integer less than or equal to x, L_LENGTH denotes the length information, m denotes a value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame, bPE_Disambiguity denotes a value of PE Disambiguity field, THE_PREAMBLE denotes a duration of non-legacy preamble of the non-legacy physical layer frame, TSYM denotes a duration of a symbol of the data of the non-legacy physical layer frame, wherein the PE Disambiguity field is set based on the duration of a symbol of the data of the non-legacy physical layer frame and an increment of duration to set a value of the length information based on a duration of a symbol of the legacy physical layer frame. ### Claim 2 (depends on 1) The wireless communication terminal of claim 1, wherein the processor is configured to obtain a duration of a packet extension which is a padding of the non-legacy physical layer frame, according to a following equation, T PE = ⌊ ( L_LENGTH + m + 3 3 × 4 - T HE ⁢ ⁢ _ ⁢ ⁢ PREAMBLE ) - N SYM × T SYM 4 ⌋ × 4 where └x┘ denotes a largest integer less than or equal to x, L_LENGTH denotes the length information, m denotes the value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame, THE_PREAMBLE denotes the duration of non-legacy preamble of the non-legacy physical layer frame, TSYM denotes the duration of a symbol of the data of the non-legacy physical layer frame. ### Claim 3 (depends on 1) The wireless communication terminal of claim 1, wherein the increment of duration is a value obtained by multiplying a difference between a value obtained by performing a ceiling operation on a value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame and the value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame by the duration of a symbol of the legacy physical layer frame. ### Claim 4 (depends on 1) The wireless communication terminal of claim 1, wherein the processor is configured to determine a format of a non-legacy signaling field included in the non-legacy physical layer frame based on the length information. ### Claim 5 (depends on 4) The wireless communication terminal of claim 4, wherein the processor is configured to determine whether the non-legacy physical layer frame comprises a predetermined signaling field based on the length information. ### Claim 6 (depends on 1) The wireless communication terminal of claim 1, wherein the processor is configured to obtain the information other than the information on the duration of the non-legacy physical layer frame based on the remaining value and a modulation method of a third symbol after the legacy signaling field. ### Claim 7 (depends on 6) The wireless communication terminal of claim 6, wherein the modulation method is Binary Phase Shift Keying (BPSK) or Quadrature Binary Phase Shift Keying (QBPSK). ### Claim 8 An operation method of a wireless communication terminal that communicates wirelessly, the method comprising: receiving a non-legacy physical layer frame by using the transceiver, obtaining a legacy signaling field including information decodable by a legacy wireless communication terminal from the non-legacy physical layer frame, obtaining length information indicating information on a duration of the non-legacy physical layer frame after a legacy signaling field, from the legacy signaling field, obtaining information other than the information on the duration of the non-legacy physical layer frame through a remaining value obtained by dividing the length information by a data size transmittable by a symbol of a legacy physical layer frame, wherein the data size transmittable by a symbol of the legacy physical layer frame is 3 octets when a data rate of the legacy physical layer frame is 6 Mbps, and determining the number of symbols of the data of the non-legacy physical layer frame according to a following equation, N SYM = ⌊ ( L_LENGTH + m + 3 3 × 4 - T HE ⁢ ⁢ _ ⁢ ⁢ PREAMBLE ) / T SYM ⌋ - b PE ⁢ ⁢ _ ⁢ ⁢ Disambiguity where [x] denotes a largest integer less than or equal to x, L_LENGTH denotes the length information, m denotes a value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame, bPE_Disambiguity denotes a value of PE Disambiguity field, THE_PREAMBLE denotes a duration of non-legacy preamble of the non-legacy physical layer frame, TSYM denotes a duration of a symbol of the data of the non-legacy physical layer frame, wherein the PE Disambiguity field is set based on the duration of a symbol of the data of the non-legacy physical layer frame and an increment of duration to set a value of the length information based on a duration of a symbol of legacy physical layer frame. ### Claim 9 (depends on 8) The method of claim 8, the method further comprises obtaining a duration of a packet extension which is a padding of the non-legacy physical layer frame, according to a following equation, T PE = ⌊ ( L_LENGTH + m + 3 3 × 4 - T HE ⁢ ⁢ _ ⁢ ⁢ PREAMBLE ) - N SYM × T SYM 4 ⌋ × 4 where [x] denotes a largest integer less than or equal to x, L_LENGTH denotes the length information, m denotes the value obtained by subtracting the remaining value from the data size transmittable by a symbol of the legacy physical layer frame, THE_PREAMBLE denotes the duration of non-legacy preamble of the non-legacy physical layer frame, TSYM denotes the duration of a symbol of the data of the non-legacy physical layer frame. ### Claim 10 (depends on 8) The method of claim 8, wherein the increment of duration is a value obtained by multiplying a difference between a value obtained by performing a ceiling operation on a value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame and the value obtained by dividing the duration of the non-legacy physical layer frame after the legacy signaling field by the duration of a symbol of the legacy physical layer frame by the duration of a symbol of the legacy physical layer frame. ### Claim 11 (depends on 8) The method of claim 8, the method further comprises determining a format of a non-legacy signaling field included in the non-legacy physical layer frame based on the length information. ### Claim 12 (depends on 11) The method of claim 11, wherein determining the format of a non-legacy signaling field included in the non-legacy physical layer frame comprises determining whether the non-legacy physical layer frame comprises a predetermined signaling field based on the length information. ### Claim 13 (depends on 8) The method of claim 8, wherein the obtaining the information other than the information on the duration of the non-legacy physical layer frame comprises obtaining the information other than the information on the duration of the non-legacy physical layer frame based on the remaining value and a modulation method of a third symbol after the legacy signaling field. ### Claim 14 (depends on 13) The method of claim 13, wherein the modulation method is Binary Phase Shift Keying (BPSK) or Quadrature Binary Phase Shift Keying (QBPSK).