# US 2018/0324800 A1 · Method for transmitting and receiving frame > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324800 A1 - Document ID: US20180324800A1 - Status: Published application - Kind: A1 - Application number: 16/039,675 - Filed: 2018-07-19 - Published: 2018-11-08 - Earliest claimed: 2014-05-09 - Assignees: Newracom, Inc. - Applicants: Newracom, Inc. - Inventors: ILGU LEE; Changwahn YU - Web page: https://patentgrep.com/patent/US20180324800A1 ## CPC - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)} - H04L 1/0083: {Formatting with frames or packets; Protocol or part of protocol for error control} - H04L 25/02: Details {; arrangements for supplying electrical power along data transmission lines (systems for transmitting signals via power distribution lines H04B3/54)} - H04L 25/0202: {Channel estimation} - H04L 25/0226: {sounding signals per se} - H04W 72/30: Resource management for broadcast services - H04W 72/00: Local resource management - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A frame transmission method is provided by a device in a wireless communication network. The device generates a signal field including a symbol using a 64 FFT and carrying signaling information, and generates a data field including a symbol using a FFT having a larger size than the 64 FFT and carrying data. The device transmits a frame including the signal field and the data field. ## Claims ### Claim 1 A method of transmitting a frame by a device in a wireless communication network, the method comprising: generating a High Efficiency Signal A (HE-SIG-A) field including a symbol having a first subcarrier spacing, the HE-SIG-A field carrying common signaling information for a plurality of receiving devices, the HE-SIG-A field occupying a 20 MHz bandwidth; generating a data field including a symbol having a second subcarrier spacing narrower than the first subcarrier spacing, the data field carrying data for a receiving device of the plurality of receiving devices, and the data field occupying a resource block; and transmitting a frame including the HE-SIG-A field and the data field, wherein an entire bandwidth used to transmit the frame is divided into a plurality of resource blocks for a plurality of users in the data field, and the resource block occupied by the data field is one of the plurality of resource blocks, and wherein an upper half of a bandwidth of the resource block carries the data for the receiving device, and a lower half of the bandwidth of the resource block carries a duplicate of the data for the receiving device carried in the upper half of the bandwidth of the resource block. ### Claim 2 (depends on 1) The method of claim 1, wherein a Fast Fourier Transform (FFT) period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing. ### Claim 3 (depends on 1) The method of claim 1, wherein the second subcarrier spacing is ¼ of the first subcarrier spacing. ### Claim 4 (depends on 1) The method of claim 1, further comprising: generating a High Efficiency Signal B (HE-SIG-B) field carrying HE-SIG-B information, the HE-SIG-B information including dedicated signaling information for the receiving device, and the HE-SIG-B field occupying the resource block; and transmitting the frame including the HE-SIG-A field, the HE-SIG-B field, and the data field, wherein an upper half of a bandwidth of the resource block carries the HE-SIG-B information, and a lower half of the bandwidth of the resource block carries a duplicate of the HE-SIG-B information carried in the upper half of the bandwidth of the resource block. ### Claim 5 (depends on 1) The method of claim 1, further comprising generating a long training field for transmission following the HE-SIG-A field and used for channel estimation, wherein the long training field includes another symbol having the second subcarrier spacing. ### Claim 6 (depends on 1) The method of claim 1, wherein the entire bandwidth is divided in to a plurality of 20 MHz channels, and further comprising: generating a legacy preamble for transmission preceding the HE-SIG-A field and being compatible with a previous version wireless communication network, wherein the legacy preamble includes a legacy short training field, a legacy long training field, and a legacy signal field, wherein the legacy short training field, the legacy long training field, the legacy signal field, and the HE-SIG-A field are duplicated and transmitted on each of the plurality of 20 MHz channels, and wherein a bandwidth narrower than 20 MHz is allowed for one or more of the plurality of resource blocks. ### Claim 7 (depends on 1) The method of claim 1, further comprising selecting a guard interval of guard intervals for the symbol having the second subcarrier spacing out of a set of allowable guard intervals for the symbol having the second subcarrier spacing according to a user or according to a current condition of a channel, wherein the set of allowable guard interval durations for the symbol having the second subcarrier spacing includes 0.8 μs, 1.6 μs, and 3.2 μs. ### Claim 8 A method of transmitting a frame by a device in a wireless communication network, the method comprising: transmitting, on a 20 MHz channel, a legacy preamble compatible with a previous version wireless communication network; transmitting, on the 20 MHz channel, a High Efficiency Signal A (HE-SIG-A) field carrying common signaling information for a plurality of receiving devices; transmitting, on a resource block included in the 20 MHz channel, a data field for a receiving device of the plurality of receiving devices, wherein an upper half of a bandwidth of the resource block carries data for the receiving device, and a lower half of the bandwidth of the resource block carries a duplicate of the data for the receiving device carried in the upper half of the bandwidth of the resource block. ### Claim 9 (depends on 8) The method of claim 8, further comprising: transmitting a long training field following the signal field and used for channel estimation. ### Claim 10 (depends on 8) The method of claim 8, wherein the legacy preamble further includes a Legacy Short Training Field used for an automatic gain control. ### Claim 11 (depends on 8) The method of claim 8, wherein a symbol of the legacy preamble and a symbol of the HE-SIG-A field have a same subcarrier spacing. ### Claim 12 (depends on 8) The method of claim 8, wherein subcarrier spacing of a symbol of the HE-SIG-A field is narrower than subcarrier spacing of a symbol of the legacy preamble. ### Claim 13 (depends on 12) The method of claim 12, wherein a first Fast Fourier Transform (FFT) is used in the legacy preamble and a second FFT having a larger size than the first FFT is used in the data field. ### Claim 14 (depends on 8) The method of claim 8, further comprising further comprising: transmitting, on the resource block, an High Efficiency Signal B (HE-SIG-B) field carrying HE-SIG-B information, the HE-SIG-B information including dedicated signaling information for the receiving device, wherein an upper half of a bandwidth of the resource block carries the HE-SIG-B information, and a lower half of the bandwidth of the resource block carries a duplicate of the HE-SIG-B information carried in the upper half of the bandwidth of the resource block. ### Claim 15 (depends on 8) The method of claim 8, further comprising selecting a guard interval of guard intervals for a symbol of the data field out of a set of allowable guard intervals for the symbol of the data field according to a user or according to a current condition of a channel, wherein the set of allowable guard interval durations for the symbol having the second subcarrier spacing includes 0.8 μs, 1.6 μs, and 3.2 μs. ### Claim 16 A method of receiving a frame by a device in a wireless communication network, the method comprising: receiving a High Efficiency Signal A (HE-SIG-A) field including a symbol having a first subcarrier spacing, the HE-SIG-A field carrying signaling information for a plurality of receiving devices including the device, the HE-SIG-A field occupying a 20 MHz bandwidth; decoding a symbol of the HE-SIG-A field on a basis of the first subcarrier spacing; receiving a data field including a symbol having a second subcarrier spacing narrower than the first subcarrier spacing, the data field carrying data and occupying a resource block having a bandwidth; and decoding the symbol of the data field on a basis of the second subcarrier spacing, wherein an upper half of the bandwidth of the resource block carries the data, and a lower half of the bandwidth of the resource block carries a duplicate of the data carried in the upper half of the bandwidth of the resource block. ### Claim 17 (depends on 16) The method of claim 16, further comprising: receiving a High Efficiency Signal B (HE-SIG-B) field carrying HE-SIG-B information, the HE-SIG-B information including dedicated signaling information for the devices, and the HE-SIG-B field occupying the resource block; and decoding the HE-SIG-B field; wherein an upper half of the bandwidth of the resource block carries the HE-SIG-B information, and a lower half of the bandwidth of the resource block carries a duplicate of the HE-SIG-B information carried in the upper half of the bandwidth of the resource block. ### Claim 18 (depends on 16) The method of claim 16, wherein the second subcarrier spacing is ¼ of the first subcarrier spacing. ### Claim 19 (depends on 16) The method of claim 16, wherein a Fast Fourier Transform (FFT) period of the symbol having the second subcarrier spacing is four times of an FFT period of the symbol having the first subcarrier spacing. ### Claim 20 (depends on 16) The method of claim 16, wherein receiving the data field includes: receiving the resource block on a first subband that is assigned to the device among a plurality of subbands into which the 20 MHz bandwidth is divided, and wherein a second subband among the plurality of subbands is assigned to another device different from the device.