# US 9,883,505 B2 · HEW packet structure and method for high-efficiency Wi-Fi (HEW) communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,883,505 B2 - Document ID: US9883505B2 - Status: Granted - Kind: B2 - Application number: 15/022,477 - Filed: 2013-12-16 - Published: 2016-08-11 - Granted: 2018-01-30 - Earliest claimed: 2013-11-19 - Assignees: Intel IP Corporation - Applicants: Intel IP Corporation - Inventors: Thomas J. Kenney; Shahrnaz Azizi; Eldad Perahia - Web page: https://patentgrep.com/patent/US9883505B2 ## CPC - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04B 7/0413: MIMO systems - H04B 7/0452: Multi-user MIMO systems - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence) - 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 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 27/2601: {Multicarrier modulation systems} - H04L 27/2602: {Signal structure} - H04L 27/2613: {Structure of the reference signals} - H04L 27/2695: {with channel estimation, e.g. determination of delay spread, derivative or peak tracking (channel estimation H04L25/0202)} - H04L 69/22: Parsing or analysis of headers - H04W 4/80: Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication - H04W 24/02: Arrangements for optimising operational condition - 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 56/002: {Mutual synchronization} - H04W 72/044: based on the type of the allocated resource - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/04: Scheduled access (hybrid access H04W74/02) - H04J 2011/0096: {Network synchronisation} - H04L 5/0023: {Time-frequency-space} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04L 27/26132: {using repetition} - H04W 84/12: WLAN [Wireless Local Area Networks] - Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level - Y02D 30/70: in wireless communication networks - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - 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 Embodiments of a master station and method for communicating in a high-efficiency Wi-Fi (HEW) network are generally described herein. In some embodiments, the master station is arranged to configure an HEW frame for communicating with a plurality of HEW compliant devices. The master station may transmit a master sync transmission that includes synchronization information and may be transmitted at a beginning of an HEW control period. The master station may configure an HEW frame to include an HEW signal field (HEW SIG) as a first field of the frame and may transmit the HEW frame without legacy synchronization information at the beginning of the HEW frame. ## Claims ### Claim 1 A master station arranged to configure a high-efficiency Wi-Fi (HEW) frame for communicating with a plurality of HEW compliant devices, the master station comprising physical layer and medium access control circuitry arranged to: transmit a master sync transmission that includes synchronization information, the master sync transmission being transmitted at a beginning of an HEW control period; configure an HEW frame to include an HEW Signal field (HEW SIG) as a first field of the frame; and transmit the HEW frame without legacy synchronization information at the beginning of the HEW frame, the HEW frame following the master sync transmission and being transmitted during the HEW control period. ### Claim 2 (depends on 1) The master station of claim 1 wherein the synchronization information included in the master sync transmission comprises a preamble structure comprising a short-training field (STF) and a long-training field (LTF), and wherein the master station is to refrain from including a short-training field (STF) and a long-training field (LTF) at the beginning of the HEW frame. ### Claim 3 (depends on 2) The master station of claim 2 wherein the master station is further arranged to configure the HEW frame to include a data field followed by a normal-length guard interval (GI), and wherein the HEW SIG includes a long guard interval (LGI) precedes a first orthogonal frequency division multiplexed (OFDM) symbol (HEW SIG-1) of the HEW SIG, the long guard interval being longer than the normal-length guard interval. ### Claim 4 (depends on 3) The master station of claim 3 wherein the HEW SIG is further configured to include a second OFDM symbol (HEW SIG-2), the second OFDM symbol being preceded with a second long guard interval. ### Claim 5 (depends on 3) The master station of claim 3 wherein the master station is arranged to refrain from including a LGI preceding the first OFDM symbol of the HEW SIG field when the HEW devices are configured to meet tighter frequency drift requirements, and wherein the master station is arranged to include the LGI preceding the first OFDM symbol of the HEW SIG field when the HEW devices are not configured to meet tighter frequency drift requirements. ### Claim 6 (depends on 3) The master station of claim 3 wherein the master station is further arranged to: contend for a wireless medium during a contention period to receive exclusive control of the medium for the HEW control period; and transmit the master-sync transmission at the beginning of the HEW control period followed by the HEW frame. ### Claim 7 (depends on 3) The master station of claim 3 wherein the HEW SIG is configured with BPSK modulation and a coding rate of one-half, and wherein the data fields are configured with a higher-order modulation and coding scheme (MCS) than BPSK modulation and a coding rate of one-half. ### Claim 8 (depends on 3) The master station of claim 3 wherein the HEW control period is an orthogonal frequency division multiple access (OFDMA) control period, wherein the master sync transmission includes at least a schedule indicating channel resources for communicating with a plurality of HEW devices during the HEW control period in accordance with an OFDMA technique, and wherein the HEW frame is configured to include a plurality of data fields, at least one data field for each of the HEW devices scheduled to communicate during the HEW control period. ### Claim 9 (depends on 8) The master station of claim 8 wherein the HEW SIG includes a single bit to indicate whether the HEW frame is a single user (SU) HEW frame or a multi-user (MU) HEW frame, and wherein the master station is further arranged to: refrain from including a legacy signal field (L-SIG) in the HEW frame; and include rate and length information in one or more signal fields of the HEW frame. ### Claim 10 (depends on 9) The master station of claim 9 wherein the HEW SIG includes a first HEW signal field (HEW SIG-A1) and a second HEW signal field (HEW SIG-A2), wherein the HEW SIG-A1 includes a length field to indicate a length of a protocol data unit when the HEW frame is an SU HEW frame, and wherein the HEW SIG-A2 indicates at least rate information comprising a modulation and coding scheme (MCS) of the one or more data fields of the HEW frame. ### Claim 11 A method for communicating with a plurality of high-efficiency Wi-Fi (HEW) compliant devices performed by a master station, the method comprising: transmitting a master sync transmission that includes synchronization information, the master sync transmission being transmitted at a beginning of an HEW control period; configuring an HEW frame to include an HEW Signal field (HEW SIG) as a first field of the frame; and transmitting the HEW frame without legacy synchronization information at the beginning of the HEW frame, the HEW frame following the master sync transmission and being transmitted during the HEW control period. ### Claim 12 (depends on 11) The method of claim 11 wherein the synchronization information included in the master sync transmission comprises a preamble structure comprising a short-training field (STF) and a long-training field (LTF), and wherein the method further includes refraining from including a short-training field (STF) and a long-training field (LTF) at the beginning of the HEW frame. ### Claim 13 (depends on 12) The method of claim 12 further comprising configuring the HEW frame to include a data field followed by a normal-length guard interval (GI), and wherein the HEW SIG includes a long guard interval (LGI) precedes a first orthogonal frequency division multiplexed (OFDM) symbol (HEW SIG-1) of the HEW SIG, the long guard interval being longer than the normal-length guard interval. ### Claim 14 (depends on 13) The method of claim 13 further comprising configuring the HEW SIG to include a second OFDM symbol (HEW SIG-2), the second OFDM symbol being preceded with a second long guard interval. ### Claim 15 (depends on 13) The method of claim 13 further comprising: refraining from including a LGI preceding the first OFDM symbol of the HEW SIG field when the HEW devices are configured to meet tighter frequency drift requirements; and including the LGI preceding the first OFDM symbol of the HEW SIG field when the HEW devices are not configured to meet tighter frequency drift requirements. ### Claim 16 A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to perform operations for high-efficiency Wi-Fi (HEW) communications, the operations comprising: transmitting a master sync transmission that includes synchronization information, the master sync transmission being transmitted at a beginning of an HEW control period; configuring an HEW frame to include an HEW Signal field (HEW SIG) as a first field of the frame; and transmitting the HEW frame without legacy synchronization information at the beginning of the HEW frame, the HEW frame following the master sync transmission and being transmitted during the HEW control period. ### Claim 17 (depends on 16) The non-transitory computer-readable storage medium of claim 16 wherein the synchronization information included in the master sync transmission comprises a preamble structure comprising a short-training field (STF) and a long-training field (LTF), and wherein the operations further include refraining from including a short-training field (STF) and a long-training field (LTF) at the beginning of the HEW frame. ### Claim 18 A wireless communication device configured for high-efficiency Wi-Fi (HEW) communications comprising: one or more antennas; physical layer circuitry coupled to the one or more antennas; and medium access control circuitry, wherein the physical layer and medium access control circuitry are arranged to: transmit, using the one or more antennas, a master sync transmission that includes synchronization information, the master sync transmission being transmitted at a beginning of an HEW control period; configure an HEW frame to include an HEW Signal field (HEW SIG) as a first field of the frame; and transmit, using the one or more antennas, the HEW frame without legacy synchronization information at the beginning of the HEW frame, the HEW frame following the master sync transmission and being transmitted during the HEW control period. ### Claim 19 (depends on 18) The wireless communication device of claim 18 wherein the synchronization information included in the master sync transmission comprises a preamble structure comprising a short-training field (STF) and a long-training field (LTF), and wherein the physical layer and medium access control circuitry is to refrain from including a short-training field (STF) and a long-training field (LTF) at the beginning of the HEW frame. ### Claim 20 (depends on 19) The wireless communication device of claim 19 wherein the physical layer and medium access control circuitry is further arranged to configure the HEW frame to include a data field followed by a normal-length guard interval (GI), and wherein the HEW SIG includes a long guard interval (LGI) precedes a first orthogonal frequency division multiplexed (OFDM) symbol (HEW SIG-1) of the HEW SIG, the long guard interval being longer than the normal-length guard interval.