# US 10,321,403 B2 · Implicit sounding for OFDMA operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,321,403 B2 - Document ID: US10321403B2 - Status: Granted - Kind: B2 - Application number: 15/881,600 - Filed: 2018-01-26 - Published: 2018-05-31 - Granted: 2019-06-11 - Earliest claimed: 2015-01-26 - Assignees: Newracom, Inc. - Applicants: Newracom, Inc. - Inventors: Ahmad Reza Hedayat - Web page: https://patentgrep.com/patent/US10321403B2 ## CPC - H04W 52/0235: {where the received signal is a power saving command} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0057: {Physical resource allocation for CQI} - H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 52/0219: {where the power saving management affects multiple terminals} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/542: using measured or perceived quality - H04W 84/12: WLAN [Wireless Local Area Networks] - Y02D 30/70: in wireless communication 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method for communication in a wireless local area network comprises receiving, at a first device, a control frame from a second device. The method further comprises determining, by the first device using the control frame, a channel state information (CSI) for each of a plurality of sub bands of a bandwidth of the control frame, and allocating, by the first device to the second device, one or more sub bands from the plurality of sub bands based on the determination, the one or more sub bands to be allocated to the second device for transmitting data to the second device from the first device via an Orthogonal Frequency Division Multiple Access (OFDMA) frame. ## Claims ### Claim 1 A method for communication in a wireless local area network, the method comprising: receiving, at a first device, a control frame using a plurality of sub bands of a widest allowable bandwidth from a second device, the control frame having a bandwidth greater than 20 MHz; determining, by the first device using one or more of a Received Signal Strength Indication (RSSI) determined by the first device using the control frame, a Signal to Interference and Noise Ratio (SINR) determined by the first device using the control frame, a Modulation and Coding Scheme (MC S) of the control frame, and a Number of Spatial Streams (NSS) of the control frame, a channel state information (CSI) for each of a plurality of sub bands of a bandwidth of the control frame; and allocating, by the first device to the second device, one or more sub bands from the plurality of sub bands based on the CSI, wherein the widest allowable bandwidth is determined according to whether one or more of a secondary 80 MHz channel, a secondary 40 MHz channel, and a secondary 20 MHz channel is sensed busy during a Point coordination function InterFrame Space (PIFS) before transmission of the control frame, wherein when both the first and second device may communicate using a 160 MHz bandwidth, the widest allowable bandwidth is 80 MHz when the secondary 80 MHz channel is sensed busy, and wherein when both the first and second device may communicate using, an 80 MHz or greater bandwidth, the widest allowable bandwidth is 40 MHz when the secondary 40 MHz channel is sensed busy. ### Claim 2 (depends on 1) The method of claim 1, further comprising: transmitting, from the first device to the second device before receiving the control frame, an indication that the first device permits transmission by the second device of the control frame using the widest allowable bandwidth. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving, by the first device from the second device before receiving the control frame, an indication that the second device supports transmission of control frames using a bandwidth greater than 20 MHz. ### Claim 4 (depends on 3) The method of claim 3, further comprising: receiving, by the first device from the second device before receiving the control frame, an indication that the second device supports transmission of control frames using a bandwidth greater than 40 MHz. ### Claim 5 (depends on 1) The method of claim 1, wherein the control frame is a Power Save (PS) Poll frame. ### Claim 6 (depends on 1) The method of claim 1, wherein receiving the control frame includes receiving the control frame in a Non-High Throughput (Non-HT) duplicate format. ### Claim 7 A method for communication in a wireless local area network, the method comprising: determining, by a first device, a widest allowable bandwidth; and transmitting, by the first device to a second device, a control frame using a plurality of sub bands of the widest allowable bandwidth to a second device, the control frame having a bandwidth greater than 20 MHz; wherein determining the widest allowable bandwidth comprises: determining a current maximum operating bandwidth, producing, during a Point coordination function InterFrame Space (PIFS) before transmission of the control frame, one or more of a determination of whether a secondary 80 MHz channel is sensed busy, a determination of whether a secondary 40 MHz channel is sensed busy, and a determination of whether a secondary 20 MHz channel is sensed busy, when the current maximum operating bandwidth is greater than 80 MHz, determining the widest allowable bandwidth is 80 MHz when the secondary 80 MHz channel is sensed busy, and when the current maximum operating bandwidth is greater than 40 MHz, determining the widest allowable bandwidth is 40 MHZ when the secondary 40 MHz channel is sensed busy. ### Claim 8 (depends on 7) The method of claim 7, further comprising: receiving, by the first device from the second device before transmitting the control frame, an indication that the second device permits transmission by the first device of the control frame using the widest allowable bandwidth. ### Claim 9 (depends on 7) The method of claim 7, further comprising: transmitting, by the first device to the second device before transmitting the control frame, an indication that the first device supports transmission of control frames using a bandwidth greater than 20 MHz. ### Claim 10 (depends on 9) The method of claim 9, further comprising: transmitting, by the first device to the second device before transmitting the control frame, an indication that the second device supports transmission of control frames using a bandwidth greater than 40 MHz. ### Claim 11 (depends on 7) The method of claim 7, wherein the control frame is a Power Save (PS) Poll frame. ### Claim 12 (depends on 7) The method of claim 7, wherein transmitting the control frame includes transmitting the control frame in a Non-High Throughput (Non-HT) duplicate format. ### Claim 13 (depends on 7) The method of claim 7, wherein determining the current maximum operating bandwidth comprises: determining a current operational bandwidth of the first device; determining a current operational bandwidth of the second device; and determining the current maximum operating bandwidth according to the lesser of the current operational bandwidth of the first device and the current operational bandwidth of the second device. ### Claim 14 A wireless device, the wireless device comprising: a receiver; a transmitter; and a processor, the processor configured to perform: determining, using the receiver, a widest allowable bandwidth; and transmitting, using the transmitter, a control frame using a plurality of sub bands of the widest allowable bandwidth to another device, the control frame having a bandwidth greater than 20 MHz, wherein determining the widest allowable bandwidth comprises: determining a current maximum operating bandwidth, producing, during a Point coordination function InterFrame Space (PIFS) before transmission of the control frame and using the receiver, one or more of a determination of whether a secondary 80 MHz channel is sensed busy, a determination of whether a secondary 40 MHz channel is sensed busy, and a determination of whether a secondary 20 MHz channel is sensed busy, when the current maximum operating bandwidth is greater than 80 MHz, determining the widest allowable bandwidth is 80 MHz when the secondary 80 MHz channel is sensed busy, and when the current maximum operating bandwidth is greater than 40 MHz, determining the widest allowable bandwidth is 40 MHz when the secondary 40 MHz channel is sensed busy. ### Claim 15 (depends on 14) The wireless device of claim 14, further comprising: receiving, by the wireless device from the other device before transmitting the control frame, an indication that the other device permits transmission by the wireless device of the control frame using the widest allowable bandwidth. ### Claim 16 (depends on 14) The wireless device of claim 14, further comprising: transmitting, by the wireless device to the other device before transmitting the control frame, an indication that the wireless device supports transmission of control frames using a bandwidth greater than 20 MHz. ### Claim 17 (depends on 16) The wireless device of claim 16, further comprising: transmitting, by the wireless device to the other device before transmitting the control frame, an indication that the wireless device supports transmission of control frames using a bandwidth greater than 40 MHz. ### Claim 18 (depends on 14) The wireless device of claim 14, wherein the control frame is a Power Save (PS) Poll frame. ### Claim 19 (depends on 14) The wireless device of claim 14, wherein transmitting the control frame includes transmitting the control frame in a Non-High Throughput (Non-HT) duplicate format. ### Claim 20 (depends on 14) The wireless device of claim 14, wherein determining the current maximum operating bandwidth comprises: determining a current operational bandwidth of the wireless device; determining a current operational bandwidth of the other device; and determining the current maximum operating bandwidth according to the lesser of the current operational bandwidth of the wireless device and the current operational bandwidth of the other device.