Transmission of punctured data packets and partial bandwidth feedback

Abstract

A technique for wireless communication of punctured nulling data packets with long training field sequences is disclosed. A long training field (LTF) sequence is generated for a nulling data packet (NDP) for transmission on a channel having a bandwidth that is an integer multiple of 80 MHz. The LTF sequence is modulated onto a plurality of tones of the channel other than tones within a punctured subchannel of a plurality of subchannels of the channel. The modulation may be based on the size or position of the punctured subchannel and the symbol duration associated with transmitting the LTF sequence. The NDP including the LTF sequence is transmitted to a second wireless communication device via the channel. Partial bandwidth feedback may be received in response to the LTF in the punctured NDP.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of non-provisional patent application no. 17 / 356,330 filed in the U.S. Patent Office on June 23, 2021, provisional patent application no. 63 / 043,7757 filed in the U.S. Patent Office on June 24, 2020, and provisional patent application no. 63 / 052,453 filed in the U.S. Patent Office on July 15, 2020, the entire contents of which are incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] The present disclosure relates generally to wireless communications, and more particularly to transmission of punctured data packets and fractional bandwidth feedback in wireless communication systems.

[0004] Related technical description

[0005] A wireless local area network (WLAN) may be formed by one or more wireless access points (APs) that provide a shared wireless communication medium for use by multiple client devices, also referred to as wireless stations (STAs). The basic building block of a WLAN that complies with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 family of standards is a basic service set (BSS) managed by an AP.

[0006] As wireless communications have evolved toward ever-increasing data rates, the IEEE 802.11 standard has also evolved to provide increased throughput. Recently, IEEE 802.11be is being developed, which defines extremely high throughput (EHT) wireless communications using large bandwidth channels (e.g., with bandwidths of 240 MHz, 320 MHz, or greater). The total channel bandwidth may include a combination of sub-channels (potentially of different sizes) in one or more frequency bands (such as the 5 GHz or 6 GHz bands).

[0007] IEEE 802.11be proposes to transmit signals using Orthogonal Frequency Division Multiple Access (OFDMA), which is a multi-user version of the Orthogonal Frequency Division Multiplexing (OFDM) digital modulation scheme. OFDM employs multi-carrier modulation in which multiple carriers (such as parallel subcarriers), each carrying low bit rate data, are orthogonal to each other.

[0008] In some cases, the AP may communicate with one or more STAs using multiple-input multiple-output (MIMO) technology. For example, the AP may use beamforming to direct MIMO transmissions to one or more STAs and reduce signaling interference on the beamformed signaling channel for each of the one or more STAs. In order to send beamformed MIMO transmissions, the AP may determine channel information according to an explicit sounding procedure that involves several packet exchanges between the AP and the one or more STAs (e.g., a target STA). Such sounding procedures include the transmission of a long training field (LTF) on one or more subchannels. Channel perforation is a technique that uses narrow subchannels of a larger channel for transmission. However, in some cases, such explicit sounding procedures and the acquisition of channel information may be affected by the perforation of subchannels used for such sounding procedures.

[0009] Overview

[0010] A brief summary of one or more aspects of the present disclosure is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived features of the present disclosure, and is neither intended to identify the key or decisive elements of all aspects of the present disclosure nor to attempt to define the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in a simplified form as a prelude to a more detailed description that will be given later.

[0011] Some aspects provide a method and apparatus for wireless communication using a long training field (LTF) sequence by a wireless communication device. A long training field (LTF) sequence for a null data packet (NDP) may be obtained or generated for transmission on a channel having a bandwidth that is an integer multiple of 80 MHz. The LTF sequence may be modulated onto a plurality of tones of the channel other than the tones within a perforated subchannel in a plurality of subchannels of the channel, the modulation being based on the size and position of the perforated subchannel and the symbol duration associated with transmitting the LTF sequence. A null data packet announcement (NDPA) for transmission on the channel may also be obtained or generated. The NDPA includes a partial bandwidth information subfield, the partial bandwidth information subfield including an 8-bit subfield for identifying a 242 tone resource unit (RU) start index and an end index, the partial bandwidth information subfield identifying an indexed range of feedback tones for channel state information (CSI). Subsequently, the NDP including the LTF sequence may be transmitted to a second wireless communication device via the channel. The NDPA may also be transmitted to a second wireless communication device via the channel.

[0012] In one aspect, modulating the LTF sequence onto multiple tones is based on an orthogonal frequency division multiple access (OFDMA) data frequency modulation plan for an 80 MHz bandwidth channel or an OFDMA data frequency modulation plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz. The symbol duration associated with the LTF sequence can be one of: 12.8 μs plus a guard interval, 6.4 μs plus a guard interval, or 3.2 μs plus a guard interval, and wherein the guard interval is one of 0.8 μs, 1.6 μs, or 3.2 μs.

[0013] In one example, the symbol duration associated with the LTF sequence is 12.8 μs plus a guard interval, and wherein the LTF sequence is modulated onto each tone within a plurality of tone ranges of an OFDMA data tone plan, and the channel comprises an 80 MHz bandwidth portion comprising a punctured subchannel; the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 tones; and the plurality of tone ranges: comprise tones [-253:-12,12:253,259:50 based on the punctured subchannel being the first 20 MHz subchannel 0], including the frequency modulation [-500:-259,12:253,259:500] based on the perforated subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, including the frequency modulation [-500:-259,-253:-12,259:500] based on the perforated subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, or including the frequency modulation [-500:-259,-253:-12,12:253] based on the perforated subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel.

[0014] In another example, the codeword duration associated with the LTF sequence is 12.8 μs plus the protection interval, and wherein the LTF sequence is modulated onto each frequency tone within a plurality of frequency tone ranges of an OFDMA data frequency tone plan, the channel comprises an 80 MHz bandwidth portion including a perforated subchannel; the perforated subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 frequency tones; and the plurality of frequency tone ranges: comprise frequency tones [12:253,259:500] based on the perforated subchannel being a first 40 MHz subchannel, or comprise frequency tones [-500:-259,-253:-12] based on the perforated subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel.

[0015] In yet another example, the symbol duration associated with the LTF sequence is 6.4 μs plus a guard interval, and the LTF sequence is modulated onto every other tone within a plurality of tone ranges of an OFDMA data tone plan, and the channel includes an 80 MHz bandwidth portion including a punctured subchannel; the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion includes 1001 tones; and the plurality of tone ranges include: tones [-252:2:-12,12:2:252,260:2:500] based on the punctured subchannel being the first 20 MHz subchannel, The perforated subchannel includes the frequency modulation [-500:2:-260,12:2:252,260:2:500] for a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, based on the perforated subchannel including the frequency modulation [-500:2:-260,-252:2:-12,260:2:500] for a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, or based on the perforated subchannel including the frequency modulation [-500:2:-260,-252:2:-12,12:2:252] for a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel.

[0016] According to another aspect, the codeword duration associated with the LTF sequence is 6.4μs plus the protection interval, and the LTF sequence is modulated to every other frequency tone within a plurality of frequency tone ranges of the OFDMA data frequency tone plan, and the channel includes an 80MHz bandwidth portion including a perforated subchannel; the perforated subchannel has a 40MHz bandwidth within the 80MHz bandwidth portion; the 80MHz bandwidth portion includes 1001 frequency tones; and the plurality of frequency tone ranges: include frequency tones [12:2:252,260:2:500] based on the perforated subchannel being the first 40MHz subchannel, or include frequency tones [-500:2:-260,-252:2:-12] based on the perforated subchannel being the second 40MHz subchannel adjacent to the first 40MHz subchannel.

[0017] In yet another example, the symbol duration associated with the LTF sequence is 3.2 μs plus a guard interval, and the LTF sequence is modulated onto every fourth tone within a plurality of tone ranges of an OFDMA data tone plan, and the channel includes an 80 MHz bandwidth portion including a punctured subchannel; the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion includes 1001 tones; and the plurality of tone ranges include: tones [-252:4:-12, 12:4:252, 260:4:500] based on the punctured subchannel being the first 20 MHz subchannel, The perforated subchannel includes the frequency modulation [-500:4:-260,12:4:252,260:4:500] for a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, based on the perforated subchannel including the frequency modulation [-500:4:-260,-252:4:-12,260:4:500] for a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, or based on the perforated subchannel including the frequency modulation [-500:4:-260,-252:4:-12,12:4:252] for a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel.

[0018] In yet another example, the symbol duration associated with the LTF sequence is 3.2 μs plus a guard interval, and the LTF sequence is modulated onto every fourth tone within a plurality of tone ranges of an OFDMA data tone plan, and the channel includes an 80 MHz bandwidth portion including a punctured subchannel; the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion includes 1001 tones; and the plurality of tone ranges include: tones [12:4:252, 260:4:500] based on the punctured subchannel being a first 40 MHz subchannel, or tones [-500:4:-260, -252:4:-12] based on the punctured subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel.

[0019] Additionally, according to some aspects, the method and apparatus may further include: receiving channel state information (CSI) about a channel in response to transmitting an NDP with a partial feedback request, wherein the partial feedback request covers an 80 MHz bandwidth portion of a channel less than an 80 MHz bandwidth channel or less than a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, wherein the CSI includes one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and wherein the CSI is received in an indexed range of feedback tones within 242 tone resource units (RUs).

[0020] For a 242-tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone indices for an 80 MHz bandwidth channel include the following start / end tone indices: (a) indexed tone [-500, -260] providing feedback for the first 20 MHz subchannel of the 80 MHz bandwidth channel, (b) indexed tone [-252, 12] providing feedback for the second 20 MHz subchannel of the 80 MHz bandwidth channel, (c) indexed tone [12, 252] providing feedback for the third 20 MHz subchannel of the 80 MHz bandwidth channel, and (d) indexed tone [260, 500] providing feedback for the fourth 20 MHz subchannel of the 80 MHz bandwidth channel.

[0021] For 242 frequency-tuned RUs with n=4 or n=16 feedback frequency-tuning intervals, the feedback start / end frequency-tuning indices for the 80 MHz bandwidth portion of the 160 MHz bandwidth channel include the following start / end frequency-tuning indices: [-1012, -772] for the 1st indexed RU, [-764, -524] for the 2nd indexed RU, [-500, -260] for the 3rd indexed RU, [-252, -12] for the 4th indexed RU, [12, 252] for the 5th indexed RU, [260, 500] for the 6th indexed RU, [524, 764] for the 7th indexed RU, and [772, 1012] for the 8th indexed RU.

[0022] For 242 frequency-tone RUs with n=4 or n=16 feedback frequency-tone intervals, the feedback start / end frequency-tone indices for the 80 MHz bandwidth portion of the 320 MHz bandwidth channel include the following start / end frequency-tone indices: [-2036, -1796] for the 1st indexed RU, [-1788, -1548] for the 2nd indexed RU, [-1524, -1284] for the 3rd indexed RU, [-1276, -1036] for the 4th indexed RU, [-1012, -772] for the 5th indexed RU, [-764, -524] for the 6th indexed RU, [-1524, -1284] for the 3rd indexed RU, [-1276, -1036] for the 4th indexed RU, [-1012, -772] for the 5th indexed RU, [-1524, -1284] for the 6th indexed RU, [-1524, -1284] for the 7th indexed RU, [-1524, -1284] for the 8th indexed RU, [-1276, -1036] for the 9th indexed RU, [-1 [-500, -260] for the 7th indexed RU, [-252, -12] for the 8th indexed RU, [12, 252] for the 9th indexed RU, [260, 500] for the 10th indexed RU, [524, 764] for the 11th indexed RU, [772, 1012] for the 12th indexed RU, [1036, 1276] for the 13th indexed RU, [1284, 1524] for the 14th indexed RU, [1548, 1788] for the 15th indexed RU, and [1796, 2036] for the 16th indexed RU.

[0023] Additionally, according to some aspects, the method and apparatus may further include: receiving channel state information (CSI) about a channel in response to transmitting an NDP with a feedback request for the entire channel bandwidth, the feedback request covering the entire 80 MHz bandwidth channel or the entire 80 MHz bandwidth portion of the 160 MHz bandwidth channel or the 320 MHz bandwidth channel, the CSI including one feedback tone for every n grouped tones in a plurality of tones of the channel, where n=4 or 16, and the CSI is received in an indexed range of feedback tones within a 996 tone resource unit (RU). In one example, a set of feedback tones for the entire 80 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone intervals is defined as [-500:4:-4,4:4:500], which spans a region of every 3 tones of 1001 tones [-500 to +500] and has a DC tone region between [-4:4].

[0024] In another example, the set of feedback tones for the entire 160 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which include: (a) indexed tones [-1012:4:-516, -508:4:-12] providing feedback for the first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:4:508, 516:4:1012] providing feedback for the second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0025] In yet another example, the set of feedback tones for the entire 320 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which include: (a) indexed tones [-2036:4:-1540, -1532:4:-1036] providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel, (b) providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel, and (c) providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel. (c) providing indexed frequency modulation [12:4:508,516:4:1012] for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel, and (d) providing indexed frequency modulation [1036:4:1532,1540:4:2036] for feedback of the second 80 MHz subchannel of the 320 MHz bandwidth channel.

[0026] In yet another example, the set of feedback tones for an entire 80 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which include indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning a region of every 15 tones of 1001 tones [-500:500] and having a DC tone region between [-4:4].

[0027] In yet another example, the set of feedback tones for an entire 160 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which feedback start and end tone index tables include: (a) indexed tones [-1012:16:-772, 764:16:-524, -516, -508, -500:16:-260, -252:16:-12] providing feedback for a first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:16:252, 260:16:500, 508, 516, 524:16:764, 772:16:1012] providing feedback for a second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0028] In yet another example, the set of feedback tones for an entire 320 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which feedback start and end tone index tables include: (a) indexed tones providing feedback for a first 80 MHz subchannel of the 320 MHz bandwidth channel [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036], (b) indexed tones providing feedback for a second 80 MHz subchannel of the 320 MHz bandwidth channel [-1012:16: -772,-764:16:-524,-516,-508,-500:16:-260,-252:16:-12], (c) providing indexed frequency modulation for feedback of the first 80 MHz sub-channel of the 320 MHz bandwidth channel [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012], and (d) providing indexed frequency modulation for feedback of the second 80 MHz sub-channel of the 320 MHz bandwidth channel [1036:16:1276,1284:16:1524,1532,1540,1548:16:1788,1796:16:2036].

[0029] Some other aspects provide a method and apparatus for wireless communication by a wireless communication device to provide channel state information in the presence of channel puncturing. A null data packet (NDP) may be received on a channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the channel other than tones within a punctured subchannel of a plurality of subchannels of the channel, the modulation being based on a size and position of the punctured subchannel and a symbol duration associated with transmission of a sequence of LTFs. Channel state information (CSI) about a channel is generated in response to receiving an NDP with a feedback request for at least a portion of a channel bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth portion of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI including one feedback tone for each n grouped tones of a plurality of tones of the channel, where n=4 or 16, and the CSI is modulated in an indexed range of feedback tones within a 242 tone resource unit (RU) or a 996 tone resource unit (RU). A blanking data packet announcement (NDPA) may also be received on the channel, the NDPA including a partial bandwidth information subfield, the partial bandwidth information subfield including an 8-bit subfield for identifying a start index and an end index of a 242 tone resource unit (RU), the partial bandwidth information subfield identifying an indexed range of feedback tones for the channel state information (CSI). The CSI is then transmitted to the first wireless device. In some aspects, the LTF sequence may be modulated onto multiple tones based on an orthogonal frequency division multiple access (OFDMA) data tone plan for an 80 MHz bandwidth channel or an OFDMA data tone plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz.

[0030] In some aspects, the feedback request is a partial feedback request for an 80 MHz bandwidth portion of less than an 80 MHz bandwidth channel or less than a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI comprising one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and wherein the CSI is modulated in an indexed range of feedback tones within 242 tone resource units (RUs).

[0031] In one example, for a 242-tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone indices for an 80 MHz bandwidth channel include the following start / end tone indices: (a) indexed tone [-500, -260] providing feedback for a first 20 MHz subchannel of the 80 MHz bandwidth channel, (b) indexed tone [-252, 12] providing feedback for a second 20 MHz subchannel of the 80 MHz bandwidth channel, (c) indexed tone [12, 252] providing feedback for a third 20 MHz subchannel of the 80 MHz bandwidth channel, and (d) indexed tone [260, 500] providing feedback for a fourth 20 MHz subchannel of the 80 MHz bandwidth channel.

[0032] In another example, for 242 frequency-tuned RUs with n=4 or n=16 feedback frequency-tuning intervals, the feedback start / end frequency-tuning indices for the 80 MHz bandwidth portion of the 160 MHz bandwidth channel include the following start / end frequency-tuning indices: [-1012, -772] for the 1st indexed RU, [-764, -524] for the 2nd indexed RU, [-500, -260] for the 3rd indexed RU, [-252, -12] for the 4th indexed RU, [12, 252] for the 5th indexed RU, [260, 500] for the 6th indexed RU, [524, 764] for the 7th indexed RU, and [772, 1012] for the 8th indexed RU.

[0033] In yet another example, for 242 frequency-tone RUs with n=4 or n=16 feedback frequency-tone intervals, the feedback start / end frequency-tone indexes for the 80 MHz bandwidth portion of the 320 MHz bandwidth channel include the following start / end frequency-tone indexes: [-2036, -1796] for the 1st indexed RU, [-1788, -1548] for the 2nd indexed RU, [-1524, -1284] for the 3rd indexed RU, [-1276, -1036] for the 4th indexed RU, [-1012, -772] for the 5th indexed RU, [-764, -524] for the 6th indexed RU , [-500, -260] for the 7th indexed RU, [-252, -12] for the 8th indexed RU, [12, 252] for the 9th indexed RU, [260, 500] for the 10th indexed RU, [524, 764] for the 11th indexed RU, [772, 1012] for the 12th indexed RU, [1036, 1276] for the 13th indexed RU, [1284, 1524] for the 14th indexed RU, [1548, 1788] for the 15th indexed RU, and [1796, 2036] for the 16th indexed RU.

[0034] In one aspect, the feedback request is a complete feedback request covering an entire 80 MHz bandwidth channel or an entire 80 MHz bandwidth portion of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI including one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and wherein the CSI is modulated in an indexed range of feedback tones within 996 tone resource units (RUs).

[0035] In one example, the feedback tone set for the entire 80 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone spacing is defined as [-500:4:-4,4:4:500], which spans every 3 tone region of 1001 tones [-500 to +500] with a DC tone region between [-4:4].

[0036] In another example, the set of feedback tones for the entire 160 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which include: (a) indexed tones [-1012:4:-516, -508:4:-12] providing feedback for the first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:4:508, 516:4:1012] providing feedback for the second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0037] In yet another example, the set of feedback tones for the entire 320 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which include: (a) indexed tones [-2036:4:-1540, -1532:4:-1036] providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel, (b) providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel, and (c) providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel. (c) providing indexed frequency modulation [12:4:508,516:4:1012] for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel, and (d) providing indexed frequency modulation [1036:4:1532,1540:4:2036] for feedback of the second 80 MHz subchannel of the 320 MHz bandwidth channel.

[0038] In yet another example, the set of feedback tones for an entire 80 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which include indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning a region of every 15 tones of 1001 tones [-500:500] and having a DC tone region between [-4:4].

[0039] In yet another example, the set of feedback tones for an entire 160 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which feedback start and end tone index tables include: (a) indexed tones [-1012:16:-772, 764:16:-524, -516, -508, -500:16:-260, -252:16:-12] providing feedback for a first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:16:252, 260:16:500, 508, 516, 524:16:764, 772:16:1012] providing feedback for a second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0040] In yet another example, the set of feedback tones for an entire 320 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone index tables for each 996-tone RU, which feedback start and end tone index tables include: (a) indexed tones providing feedback for a first 80 MHz subchannel of the 320 MHz bandwidth channel [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036], (b) indexed tones providing feedback for a second 80 MHz subchannel of the 320 MHz bandwidth channel [-1012:16: -772,-764:16:-524,-516,-508,-500:16:-260,-252:16:-12], (c) providing indexed frequency modulation for feedback of the first 80 MHz sub-channel of the 320 MHz bandwidth channel [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012], and (d) providing indexed frequency modulation for feedback of the second 80 MHz sub-channel of the 320 MHz bandwidth channel [1036:16:1276,1284:16:1524,1532,1540,1548:16:1788,1796:16:2036]. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Details of one or more aspects of the subject matter described in the present disclosure are set forth in the accompanying drawings and the following description. However, the accompanying drawings illustrate only some typical aspects of the present disclosure and are therefore not to be considered as limiting its scope. Other features, aspects and advantages will become apparent from the description, drawings and claims.

[0043] Figure 1 A block diagram of an example wireless communication network is shown.

[0044] Figure 2A Example protocol data units (PDUs) that may be used for wireless communications between an access point (AP) and one or more wireless stations (STAs) are shown.

[0045] Figure 2B Shows Figure 2A Example legacy signal field (L-SIG) in a PDU.

[0046] Figure 3A An example physical layer convergence protocol (PLCP) protocol data unit (PPDU) that may be used for wireless communications between an AP and one or more STAs is shown.

[0047] Figure 3BAnother example PPDU that may be used for wireless communications between an AP and one or more STAs is shown.

[0048] Figure 4 An example 2N tone plan is shown.

[0049] Figure 5 An example of tone planning for an extremely high throughput (EHT) 80 MHz bandwidth channel is illustrated.

[0050] Figure 6 is a table illustrating an Orthogonal Frequency Division Multiple Access (OFDMA) data tone plan for an 80 MHz bandwidth channel, which can be the basis for a Long Training Field (LTF) tone plan for transmission of punctured blanked data packets.

[0051] Figure 7

[0013] A flow chart illustrating an example method for wireless communication including generating and transmitting a long training field sequence for blanking data packets according to one aspect is shown.

[0052] Figure 8 An example of a feedback start / end tone index table is explained.

[0053] Fig. 9 Another example of a feedback start / end tone index table is illustrated.

[0054] Fig.10 An example of a feedback start / end tone index table is explained.

[0055] Fig.11 Another example of a feedback start / end tone index table is illustrated.

[0056] Fig.12

[0066] Yet another example of a feedback start / end tone index table is illustrated.

[0057] Fig.13 Another option for feeding back the start / end tone index table is explained.

[0058] Fig.14 An OFDMA feedback start / end tone index table for an 80 MHz bandwidth channel that may have a 20 MHz granularity is illustrated.

[0059] Fig.15

[0013] A flow chart is shown illustrating an example method for wireless communications that includes generating and transmitting a Null Data Packet Announcement (NDPA) in accordance with some aspects.

[0060] Fig.16 is a block diagram illustrating an example of a wireless device adapted to facilitate use of an 80 MHz channel bandwidth to communicate punctured blanking data packets and partial bandwidth feedback.

[0061] Fig.17 Another example of a feedback start / end tone index table is illustrated.

[0062] Fig.18 Another option for feeding back the start / end tone index table is explained.

[0063] Fig.19 is a table illustrating a specific example of OFDMA feedback start / end tone indexes for a partial 80 MHz bandwidth channel at RU242 granularity, where the feedback does not cover the entire 80 MHz bandwidth channel.

[0064] Fig. 20 is a table illustrating a specific example of OFDMA feedback start / end tone indexes for an entire 80 MHz bandwidth channel using RU996 granularity of n warp group tones Ng=4, where the feedback covers the entire 80 MHz bandwidth channel.

[0065] Fig.21 is a table illustrating a specific example of OFDMA feedback start / end tone indexes for an entire 80 MHz bandwidth channel using RU996 granularity of n warp group tones Ng=16, where the feedback covers the entire 80 MHz bandwidth channel.

[0066] Fig. 22 An example method for wireless communications that provides fractional bandwidth feedback in response to receiving a punctured blanking data packet.

[0067] Like reference numbers and designations in the various drawings indicate like elements.

[0068] Detailed Description

[0069] The following description is directed to certain specific examples in order to describe the innovative aspects of the present disclosure. However, one of ordinary skill in the art will readily recognize that the teachings herein can be applied in many different ways. Some or all of the examples described may be implemented in a manner that is capable of being implemented in accordance with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, the IEEE 802.15 standard, the Bluetooth Special Interest Group (SIG), or the like. The described implementations may be implemented in any device, system, or network capable of transmitting and receiving radio frequency (RF) signals in accordance with one or more of the Long Term Evolution (LTE), 3G, 4G, or 5G (New Radio (NR)) standards, or the like released by the Third Generation Partnership Project (3GPP). The described implementations may be implemented in any device, system, or network capable of transmitting and receiving RF signals in accordance with one or more of the following technologies or techniques: code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), single carrier FDMA (SC-FDMA), single user (SU) multiple input multiple output (MIMO), and multi-user (MU) MIMO. The described implementations may also be implemented using other wireless communication protocols or RF signals suitable for use in one or more of a wireless personal area network (WPAN), a wireless local area network (WLAN), a wireless wide area network (WWAN), or an Internet of Things (IOT) network.

[0070] In some cases, the AP may communicate with one or more STAs using multiple-input multiple-output (MIMO) technology. For example, the AP may use beamforming to direct MIMO transmissions to one or more STAs and reduce signaling interference on a beamformed signaled channel for each of the one or more STAs. In order to send beamformed MIMO transmissions, the AP may determine channel information according to an explicit sounding procedure that involves several packet exchanges between the AP and the one or more STAs (e.g., a target STA). Such sounding procedures include the transmission of a long training field (LTF) on one or more subchannels. Channel perforation is a technique that uses narrow subchannels for transmission to avoid interference. However, in some cases, such explicit sounding procedures and the acquisition of channel information may be affected by the perforation of subchannels used for such sounding procedures.

[0071] Various aspects generally relate to transmitting a punctured null data packet (NDP) as part of a sounding procedure to obtain channel information. Some aspects more specifically relate to using OFDMA data tone planning as a basis for modulating a long training field (LTF) sequence in a preamble of a punctured NDP. The tone planning is used to modulate the LTF sequence onto multiple tones of a channel in addition to the tones within a punctured subchannel of multiple subchannels of the channel. In various implementations, the modulation can be based on the size or position of the punctured subchannel and the symbol duration associated with transmitting the LTF sequence.

[0072] The advantage of this approach is that, despite the existence of channel puncturing of sub-channels, partial channel feedback for the channel can still be obtained.

[0073] Figure 1A block diagram of an example wireless communication network 100 is shown. According to some aspects, the wireless communication network 100 may be an example of a wireless local area network (WLAN) such as a Wi-Fi network (and will be referred to as WLAN 100 hereinafter). For example, the WLAN 100 may be a network that implements at least one of the IEEE 802.11 family of wireless communication protocol standards, such as the standards defined by the IEEE 802.11-2016 specification or its revisions, including but not limited to 802.11ay, 802.11ax, 802.11az, 802.11ba, and 802.11be. The WLAN 100 may include numerous wireless communication devices, such as an access point (AP) 102 and a plurality of stations (STAs) 104. Although only one AP 102 is shown, the WLAN network 100 may also include a plurality of APs 102.

[0074] Each STA 104 may also be referred to as a mobile station (MS), a mobile device, a mobile handset, a wireless handset, an access terminal (AT), a user equipment (UE), a subscriber station (SS), or a subscriber unit, among other examples. STA 104 may represent a variety of devices, such as mobile phones, personal digital assistants (PDAs), other handheld devices, netbooks, notebook computers, tablet computers, laptops, display devices (e.g., TVs, computer monitors, navigation systems, etc.), music or other audio or stereo equipment, remote control devices (“remote controls”), printers, kitchen or other home appliances, key fobs (e.g., for passive keyless entry and start (PKES) systems), and other examples.

[0075] A single AP 102 and the associated set of STAs 104 may be referred to as a basic service set (BSS), which is managed by the corresponding AP 102 . Figure 1An example coverage area 106 of the AP 105 is additionally shown, which may represent a basic service area (BSA) of the WLAN 100. The BSS may be identified to users by a service set identifier (SSID) and may also be identified to other devices by a basic service set identifier (BSSID), which may be a media access control (MAC) address of the AP 102. The AP 102 periodically broadcasts a beacon frame (“beacon”) including the BSSID to enable any STA 104 within the wireless range of the AP 102 to “associate” or reassociate with the AP 102 to establish or maintain a corresponding communication link 108 (hereinafter also referred to as a “Wi-Fi link”) with the AP 102. For example, the beacon may include an identification of a primary channel used by the corresponding AP 102 and a timing synchronization function for establishing or maintaining timing synchronization with the AP 102. The AP 102 may provide access to external networks to the respective STAs 104 in the WLAN via the corresponding communication links 108.

[0076] To establish a communication link 108 with the AP 102, each STA 104 is configured to perform passive or active scanning operations ("scanning") on frequency channels in one or more frequency bands (eg, 2.4 GHz, 5 GHz, 6 GHz, or 60 GHz bands). To perform a passive scan, the STA 104 listens for beacons transmitted by the corresponding AP 102 at periodic time intervals, referred to as target beacon transmission times (TBTTs), measured in time units (TUs), where one TU may be equal to 1024 microseconds (μs). To perform an active scan, the STA 104 generates probe requests and transmits them sequentially on each channel to be scanned, and listens for probe responses from the AP 102. Each STA 104 may be configured to identify or select an AP 102 to associate with based on the scan information obtained through passive or active scanning, and to perform authentication and association operations to establish a communication link 108 with the selected AP 102. The AP 102 assigns an association identifier (AID) to the STA 104 at the end of the association operation, and the AP 102 uses the AID to track the STA 104.

[0077] As wireless networks become more and more common, STA 104 may have the opportunity to select one of many BSSs within the range of the STA or to select among multiple APs 102 that together form an extended service set (ESS) (including multiple connected BSSs). The extended network station associated with WLAN 100 may be connected to a wired or wireless distribution system that allows multiple APs 102 to be connected in such an ESS. In this way, STA 104 may be covered by more than one AP 102 and may be associated with different APs 102 at different times for different transmissions. Additionally, after associating with AP 102, STA 104 may also be configured to periodically scan its surroundings to find a more suitable AP 102 to associate with. For example, a STA 104 that is moving relative to its associated AP 102 may perform a "roaming" scan to find another AP 102 with more suitable network characteristics (such as a larger received signal strength indicator (RSSI) or a reduced traffic load).

[0078] In some cases, STA 104 may form a network without AP 102 or other equipment other than STA 104 itself. An example of such a network is an ad hoc network (or wireless ad hoc network). An ad hoc network may alternatively be referred to as a mesh network or a peer-to-peer (P2P) network. In some cases, an ad hoc network may be implemented within a larger wireless network (such as WLAN 100). In such an implementation, although STA 104 may be able to communicate with each other through AP 102 using a communication link 108, STA 104 may also communicate directly with each other via a direct wireless link 110. In addition, two STAs 104 may communicate via a direct communication link 110, regardless of whether the two STAs 104 are associated with the same AP 102 and served by the same AP 102. In such an ad hoc system, one or more STAs 104 may assume the role played by AP 102 in a BSS. Such STAs 104 may be referred to as group owners (GOs) and may coordinate transmissions within the ad hoc network. Examples of direct wireless link 110 include a Wi-Fi Direct connection, a connection established by using a Wi-Fi Tunneled Direct Link Setup (TDLS) link, and other P2P group connections.

[0079] The AP 102 and the STA 104 may function and communicate (via corresponding communication links 108) in accordance with the IEEE 802.11 family of wireless communication protocol standards, such as those defined by the IEEE 802.11-2016 specification or its revisions, including, but not limited to, 802.11ay, 802.11ax, 802.11az, 802.11ba, and 802.11be. These standards define WLAN radio and baseband protocols for the PHY and media access control (MAC) layers. The AP 102 and the STA 104 transmit and receive wireless communications (hereinafter also referred to as "Wi-Fi communications") to and from each other in the form of PHY protocol data units (PPDUs) (or physical layer convergence protocol (PLCP) PDUs). The AP 102 and STA 104 in the WLAN 100 may transmit PPDUs on an unlicensed spectrum, which may be a portion of a spectrum that includes frequency bands traditionally used by Wi-Fi technology, such as the 2.4 GHz band, the 5 GHz band, the 60 GHz band, the 3.6 GHz band, and the 900 MHz band. Some implementations of the AP 102 and STA 104 described herein may also communicate in other frequency bands, such as the 6 GHz band, that may support both licensed and unlicensed communications. The AP 102 and STA 104 may also be configured to communicate on other frequency bands, such as shared licensed frequency bands, where multiple operators may have licenses to operate in one or more of the same or overlapping frequency bands.

[0080] Each frequency band may include multiple sub-bands or frequency channels. For example, PPDUs that comply with IEEE 802.11n, 802.11ac, 802.11ax, and 802.11be standard revisions may be transmitted on 2.4 GHz, 5 GHz, or 6 GHz frequency bands, where each frequency band is divided into multiple 20 MHz channels. In this way, these PPDUs are transmitted on a physical channel with a minimum bandwidth of 20 MHz, but larger channels may be formed by channel bonding. For example, a PPDU may be transmitted on a physical channel with a bandwidth of 40 MHz, 80 MHz, 160 MHz, or 320 MHz by bonding multiple 20 MHz channels together.

[0081] Each PPDU is a composite structure including a PHY preamble and a payload in the form of a PHY service data unit (PSDU). The information provided in the preamble can be used by the receiving device to decode subsequent data in the PSDU. In an instance where the PPDU is transmitted over a bonded channel, the preamble field can be copied and transmitted in each of a plurality of component channels. The PHY preamble may include both a legacy portion (or "legacy preamble") and a non-legacy portion (or "non-legacy preamble"). Legacy preambles can be used for packet detection, automatic gain control, and channel estimation, as well as other purposes. Legacy preambles can also generally be used to maintain compatibility with legacy devices. The format, decoding, and information provided therein of the non-legacy portion of the preamble are based on the specific IEEE 802.11 protocol to be used to transmit the payload.

[0082] Figure 2A An example protocol data unit (PDU) 200 that may be used for wireless communication between an AP 102 and one or more STAs 104 is shown. For example, the PDU 200 may be configured as a PPDU. As shown, the PDU 200 includes a PHY preamble 202 and a PHY payload 204. For example, the preamble 202 may include a legacy portion that itself includes a legacy short training field (L-STF) 206 that may consist of two BPSK symbols, a legacy long training field (L-LTF) 208 that may consist of two BPSK symbols, and a legacy signal field (L-SIG) 210 that may consist of two BPSK symbols. The legacy portion of the preamble 202 may be configured in accordance with the IEEE 802.11a wireless communication protocol standard. The preamble 202 may also include a non-legacy portion including one or more non-legacy fields 212 that comply with, for example, an IEEE wireless communication protocol such as IEEE 802.11ac, 802.11ax, 802.11be, or a later wireless communication protocol.

[0083] L-STF 206 generally enables the receiving device to perform coarse timing and frequency tracking and automatic gain control (AGC). L-LTF 208 generally enables the receiving device to perform fine timing and frequency tracking, and can also perform initial estimation of the wireless channel. L-SIG 210 generally enables the receiving device to determine the duration of the PDU and use the determined duration to avoid transmitting over the PDU. For example, L-STF 206, L-LTF 208 and L-SIG 210 can be modulated according to a binary phase shift keying (BPSK) modulation scheme. Payload 204 can be modulated according to a BPSK modulation scheme, an orthogonal BPSK (Q-BPSK) modulation scheme, an orthogonal amplitude modulation (QAM) modulation scheme, or another appropriate modulation scheme. Payload 204 may include a PSDU including a data field (DATA) 214, which in turn may carry, for example, higher layer data in the form of a media access control (MAC) protocol data unit (MPDU) or an aggregated MPDU (A-MPDU).

[0084] Figure 2B Shows Figure 2A 2. An example L-SIG 210 in a PDU 200 of FIG. 210 includes a data rate field 222, reserved bits 224, a length field 226, parity bits 228, and a tail field 230. The data rate field 222 indicates the data rate (note that the data rate indicated in the data rate field 212 may not be the actual data rate of the data carried in the payload 204). The length field 226 indicates the packet length, for example, in symbols or bytes. The parity bits 228 may be used to detect bit errors. The tail field 230 includes tail bits, which may be used by a receiving device to terminate the operation of a decoder (e.g., a Viterbi decoder). The receiving device may use the data rate and length indicated in the data rate field 222 and the length field 226 to determine the packet duration, for example, in microseconds (μs) or other time units.

[0085] Figure 3A An example PPDU 300 that can be used for wireless communication between an AP and one or more STAs is shown. The PPDU 300 can be used for SU, OFDMA, or MU-MIMO transmission. The PPDU 300 can be formatted as a high-efficiency (HE) WLAN PPDU according to the IEEE 802.11ax revision to the IEEE 802.11 wireless communication protocol standard. The PPDU 300 includes a PHY preamble that includes a legacy portion 302 and a non-legacy portion 304. The PPDU 300 can further include a PHY payload 306 (e.g., in the form of a PSDU including a data field 324) after the preamble.

[0086] The legacy portion 302 of the preamble includes an L-STF 308, an L-LTF 310, and an L-SIG 312. The non-legacy portion 304 includes a repetition of the L-SIG (RL-SIG) 314, a first HE signal field (HE-SIG-A) 316, a HE short training field (HE-STF) 320, and one or more HE long training fields (or symbols) (HE-LTF) 322. For OFDMA or MU-MIMO communications, the second portion 304 further includes a second HE signal field (HE-SIG-B) 318 that is encoded separately from the HE-SIG-A 316. The HE-STF 320 may be used for timing and frequency tracking and AGC, and the HE-LTF 322 may be used for finer channel estimation. As with L-STF 308, L-LTF 310, and L-SIG 312, in instances involving the use of bonded channels, the information in RL-SIG 314 and HE-SIG-A 316 may be replicated and transmitted in each component 20 MHz channel. In contrast, the content in HE-SIG-B 318 may be unique to each 20 MHz channel and target specific STA 104.

[0087] The RL-SIG 314 may indicate to the HE-compatible STA 104 that the PPDU 300 is a HE PPDU. The AP 102 may use the HE-SIG-A 316 to identify multiple STAs 104 and inform the multiple STAs 104 that the AP has scheduled UL or DL ​​resources for them. For example, the HE-SIG-A 316 may include a resource allocation subfield indicating the resource allocation for the identified STA 104. The HE-SIG-A 316 may be decoded by each HE-compatible STA 104 served by the AP 102. For MU transmissions, the HE-SIG-A 316 further includes information that may be used by each identified STA 104 to decode the associated HE-SIG-B 318. For example, the HE-SIG-A 316 may indicate the frame format (including the location and length of the HE-SIG-B 318), the available channel bandwidth, and the modulation and coding scheme (MCS), among other examples. The HE-SIG-A 316 may also include HE WLAN signaling information that may be used by STAs 104 other than the identified STA 104 .

[0088] HE-SIG-B 318 may carry STA-specific scheduling information, such as, for example, STA-specific (or "user-specific") MCS values ​​and STA-specific RU allocation information. In the context of DL MU-OFDMA, such information enables the corresponding STA 104 to identify and decode the corresponding resource unit (RU) in the associated data field 324. Each HE-SIG-B 318 includes a common field and at least one STA-specific field. The common field may indicate RU allocations (including RU assignments in the frequency domain) to multiple STAs 104, indicating which RUs are allocated for MU-MIMO transmissions and which RUs correspond to MU-OFDMA transmissions, as well as the number of users in the allocation and other examples. The common field may be encoded with common bits, CRC bits, and tail bits. User-specific fields are assigned to a specific STA 104 and may be used to schedule a specific RU and indicate the scheduling to other WLAN devices. Each user-specific field may include multiple user block fields. Each user block field may include two user fields containing information for two corresponding STAs to decode their corresponding RU payloads in the data field 324 .

[0089] Figure 3B Another example PPDU 350 that can be used for wireless communication between an AP and one or more STAs is shown. The PPDU 350 can be used for SU, OFDMA, or MU-MIMO transmission. The PPDU 350 can be formatted as an extremely high throughput (EHT) WLAN PPDU according to the IEEE 802.11be amendment to the IEEE 802.11 wireless communication protocol standard, or can be formatted as a PPDU that complies with any future (post-EHT) version of a new wireless communication protocol (complying with future IEEE 802.11 wireless communication protocol standards or other wireless communication standards). The PPDU 350 includes a PHY preamble that includes a legacy portion 352 and a non-legacy portion 354. The PPDU 350 may further include a PHY payload 356 (e.g., in the form of a PSDU including a data field 374) after the preamble.

[0090] The legacy portion 352 of the preamble includes an L-STF 358, an L-LTF 360, and an L-SIG 362. The non-legacy portion 354 of the preamble includes an RL-SIG 364 and a plurality of wireless communication protocol version-related signal fields following the RL-SIG 364. For example, the non-legacy portion 354 may include a universal signal field 366 (referred to herein as "U-SIG 366") and an EHT signal field 368 (referred to herein as "EHT-SIG 368"). One or both of the U-SIG 366 and the EHT-SIG 368 may be configured to be used for version-related information of other wireless communication protocol versions other than the EHT and carry the version-related information. The non-legacy portion 354 further includes an additional short training field 370 (referred to herein as "EHT-STF 370", but may also be constructed to be used for and carry version-related information for other wireless communication protocol versions other than EHT) and one or more additional long training fields 372 (referred to herein as "EHT-LTF 372", but they may be constructed to be used for and carry version-related information for other wireless communication protocol versions other than EHT). The EHT-STF 370 may be used for timing and frequency tracking and AGC, and the EHT-LTF 372 may be used for more refined channel estimation. As with the L-STF 358, L-LTF 360, and L-SIG 362, in instances involving the use of bonded channels, the information in the U-SIG 366 and the EHT-SIG 368 may be replicated and transmitted in each component 20 MHz channel. In some implementations, the EHT-SIG 368 may additionally or alternatively carry information different from the information carried in the primary 20 MHz channel in one or more non-primary 20 MHz channels.

[0091] The EHT-SIG 368 may include one or more jointly encoded symbols and may be encoded in a different block from the block in which the U-SIG 366 is encoded. The EHT-SIG 368 may be used by the AP to identify multiple STAs 104 and notify the multiple STAs 104 that the AP has scheduled UL or DL ​​resources for them. The EHT-SIG 368 may be decoded by each compatible STA 104 served by the AP 102. The EHT-SIG 368 may generally be used by the receiving device to interpret the bits in the data field 374. For example, the EHT-SIG 368 may include RU allocation information, spatial stream configuration information, and per-user signaling information (such as MCS) and other examples. The EHT-SIG 368 may further include a cyclic redundancy check (CRC) (e.g., 4 bits) and a tail (e.g., 6 bits) that may be used for a binary convolutional code (BCC). In some implementations, the EHT-SIG 368 may include one or more code blocks each including a CRC and a tail. In some aspects, each code block may be encoded separately.

[0092] The EHT-SIG 368 may carry STA-specific scheduling information, such as, for example, user-specific MCS values ​​and user-specific RU allocation information. The EHT-SIG 368 may generally be used by a receiving device to interpret bits in the data field 374. In the context of DL MU-OFDMA, such information enables the corresponding STA 104 to identify and decode the corresponding RU in the associated data field 374. Each EHT-SIG 368 may include a common field and at least one user-specific field. The common field may indicate the RU distribution to multiple STAs 104, indicate the RU assignment in the frequency domain, indicate which RUs are allocated for MU-MIMO transmission and which RUs correspond to MU-OFDMA transmission, and the number of users in the allocation and other examples. The common field may be encoded with common bits, CRC bits, and tail bits. The user-specific fields are assigned to a specific STA 104 and may be used to schedule a specific RU and indicate the scheduling to other WLAN devices. Each user-specific field may include multiple user block fields. Each user block field may include, for example, two user fields containing information for two corresponding STAs to decode their corresponding RU payloads.

[0093] The presence of the RL-SIG 364 and the U-SIG 366 may indicate to the EHT or future version compatible STA 104 that the PPDU 350 is an EHT PPDU or any future (post-EHT) version of a PPDU that complies with a new wireless communication protocol (complying with future IEEE 802.11 wireless communication protocol standards). For example, the U-SIG 366 may be used by a receiving device to interpret bits in one or more of the EHT-SIG 368 or the data field 374.

[0094] Figure 4 An example 2N tone plan 400 is shown. In some implementations, the tone plan 400 may correspond in the frequency domain to OFDM tones generated using a 2N-point Fast Fourier Transform (FFT). The tone plan 400 includes 2N OFDM tones indexed from -N to N-1. The tone plan 400 includes two sets of edge or guard tones 410, two sets of data / pilot tones 420, and a set of direct current (DC) tones 430. In some implementations, the edge or guard tones 410 and the DC tones 430 may be left blank. In some implementations, the tone plan 400 may include another suitable number of pilot tones, or may include pilot tones at other suitable tone locations.

[0095] In some aspects, an OFDMA tone plan for transmission using 4x symbol durations may be provided compared to various IEEE 802.11 protocols. For example, 4x symbol durations may use a number of symbols that may each be 12.8 μs in duration (as opposed to symbols that may be 3.2 μs in duration in some other IEEE 802.11 protocols).

[0096] In some aspects, an OFDMA tone plan for transmission using 2x symbol durations may be provided, as compared to various IEEE 802.11 protocols. For example, a 2x symbol duration may use a number of symbols that may each be 6.4 μs in duration (as opposed to symbols that may be 3.2 μs or 12.8 μs in duration in some other IEEE 802.11 protocols).

[0097] In some aspects, the data / pilot tones 420 of the transmission 400 may be divided among any number of different users. For example, the data / pilot tones 420 may be divided among one to eight users. To divide the data / pilot tones 420, the AP 104 or another device may signal various devices to indicate which devices may transmit or receive on which tones (of the data / pilot tones 420) in a particular transmission. Accordingly, systems and methods for dividing the data / pilot tones 420 may be desirable, and the division may be based on tone planning.

[0098] The frequency modulation plan can be selected based on several different characteristics. For example, it can be beneficial to have a simple frequency modulation plan that can be consistent across most or all bandwidths. For example, OFDMA transmissions can be transmitted at 20, 40, 80, 160, 240 or 320 MHz (or a combination thereof), and it may be desirable to use a frequency modulation plan that can be used for any of these bandwidths. In addition, the frequency modulation plan can be simple because it uses a smaller number of building block sizes. For example, the frequency modulation plan can include a unit that can be referred to as a resource unit (RU). The unit can be used to assign a specific number of wireless resources (e.g., bandwidth or specific frequency modulation) to a specific user. For example, a user can be assigned a bandwidth as several RUs, and the transmitted data / pilot frequency modulation 420 can be decomposed into several RUs.

[0099] As previously described, the AP and STA may support multi-user (MU) communications; that is, concurrent transmissions from one device to each of multiple devices (e.g., multiple simultaneous downlink (DL) communications from the AP to the corresponding STAs), or concurrent transmissions from multiple devices to a single device (e.g., multiple simultaneous uplink (UL) transmissions from the corresponding STAs to the AP). To support MU transmissions, the AP and STA may utilize multi-user multiple-input multiple-output (MU-MIMO) and multi-user orthogonal frequency division multiple access (MU-OFDMA) techniques.

[0100] In the MU-OFDMA scheme, the available spectrum of a wireless channel may be divided into multiple resource units (RUs), each of which includes multiple frequency subcarriers (also referred to as "tones"). Different RUs may be allocated or assigned to different STAs 104 by AP 102 at a specific time. The size and distribution of RUs may be referred to as RU allocation. In some implementations, RUs may be allocated in 2MHz intervals, and thus, the minimum RU may include 26 tones including 24 data tones and 2 pilot tones. Therefore, in a 20MHz bandwidth channel, up to 9 RUs (such as 2MHz, 26-tone RUs) may be allocated (because some tones are reserved for other purposes). Similarly, in a 160MHz bandwidth channel, up to 74 RUs may be allocated. Larger RUs of 52 tones, 106 tones, 242 tones, 484 tones, and 996 tones may also be allocated. Adjacent RUs may be separated by a nulled subcarrier, such as a DC subcarrier, for example, to reduce interference between adjacent RUs, reduce receiver DC offset, and avoid transmit center frequency leakage.

[0101] The frequency plan can also be selected based on efficiency. For example, transmissions of different bandwidths (e.g., 20, 40, 80, 160, 240, or 320 MHz or a combination thereof) may have different numbers of frequencies. Reducing the number of remaining frequencies may be beneficial. In addition, in some implementations, it may be beneficial if the frequency plan is configured to retain 20, 40, 80, 160, 240, or 320 MHz boundaries. For example, it may be desirable to have a frequency plan that allows each 20, 40, 80, 160, 240, or 320 MHz portion to be decoded separately from each other, rather than having an allocation that may be located on the boundary between two different 20, 40, 80, 160, 240, or 320 MHz portions of bandwidth. For example, it may be beneficial to align the interference pattern with the 20, 40, 80, 160, 240, or 320 MHz channel. Additionally, it may be beneficial to have channel bonding (which may also be referred to as preamble puncturing) such that while a 20 MHz transmission and a 40 MHz transmission may be transmitted, a 20 MHz "hole" is created in the transmission when transmitting on 80, 160, 240, or 320 MHz. This may allow, for example, legacy packets to be transmitted in this unused portion of the bandwidth. This puncturing may be applied to any transmission (e.g., 20, 40, 80, 160, 240, or 320 MHz transmission) and may create at least a 20 MHz "hole" in the transmission, regardless of the channel or bandwidth used. Finally, it may also be advantageous to use a frequency tone plan that provides fixed pilot tone locations in a variety of different transmissions (such as in different bandwidths).

[0102] As data transmission rate requirements increase as additional devices join the network or as additional data is added to the network, larger channel bandwidths (e.g., for orthogonal frequency division multiple access (OFDMA) transmissions) may be introduced. In one example, a frequency modulation plan for a total channel bandwidth of 320 MHz may be introduced to assist in increasing the peak system transmission data rate and utilizing available channels more efficiently. For example, since new frequencies are available (e.g., 6 GHz), these new frequency modulation plans for a larger total channel bandwidth may utilize the newly available channels more efficiently. In addition, the increased total bandwidth that may be provided by these new frequency modulation plans may allow for a better rate-to-range tradeoff. In this case, if a larger total bandwidth is used, the same or similar transmission rate may be used to provide greater coverage. Additionally, a larger total channel bandwidth may also improve the efficiency of the frequency modulation plan (e.g., how many frequencies may be used for data transmission for a specific BW), and may also increase the number of guard bands. As with any total channel bandwidth being used, different modes may be utilized depending on channel availability. For example, the current 80 MHz channel bandwidth may be divided into 20 MHz, 40 MHz, or 80 MHz modes.

[0103] Figure 5An example of a tone plan for an extremely high throughput (EHT) 80 MHz bandwidth channel is illustrated. The tone plan 500 has 12 left edge tones 502, 5 DC tones 504, 23 DC tones 506, 5 DC tones 508, and 11 right edge tones 510, for a total of 996 available tones for OFDMA. Figure 5 Six example transmissions 520, 522, 524, 526, 528, and 530 are shown using various combinations of 26 tone blocks, 52 tone blocks, 106 tone blocks, 242 tone blocks, 484 tone blocks, and 996 tone blocks. However, the allocation within any given transmission may include multiple tone blocks of different sizes or with different arrangements. For example, one transmission may include four 20 MHz bandwidth channels with a total bandwidth of 80 MHz. In a second example, another transmission may include two 40 MHz bandwidth channels with a total bandwidth of 80 MHz. However, other transmissions may include multiple subchannels of different bandwidths, but have a total bandwidth that is an integer multiple of 80 MHz.

[0104] The sixth transmission 530 includes a single user tone plan with 5 DC tones. Accordingly, the SU tone plan may include 996 available tones.

[0105] In some implementations, a larger bandwidth (BW) transmission (e.g., 160 MHz, 240 MHz, or 320 MHz) may be generated based on a 20, 40, or 80 MHz frequency tone plan. For example, a 40 MHz transmission and an 80 MHz transmission may be replicated (e.g., four times each) to create a 160 MHz and 320 MHz transmission, respectively.

[0106] However, for non-data blanking data packets (NDPs) transmissions in which at least one subchannel is punctured, frequency planning is required. Such punctured NDPs may include, for example, LTF sequences transmitted by an AP to obtain channel feedback from one or more STAs. The frequency planning used to modulate the LTF sequences should be able to account for the punctured subchannels among the multiple channels used to transmit the NDP.

[0107] Figure 6is a table illustrating the OFDMA data tone plan for an 80 MHz bandwidth channel, which can be the basis for the long training field (LTF) tone plan for transmission of a punctured NDP. In this example, data can be transmitted according to the OFDMA data tone plan 602 for the full 80 MHz bandwidth channel 609, where the data tones span regions of every 3 tones spanning 1001 tones [-500:500] and having a 7-tone direct current (DC) gap / region between [-3:3]. For full bandwidth non-data transmissions (such as LTF sequences on an NDP), the tone plan 608 can span the tone region [-500:-3, 3:500], where each tone is used for 4x LTF tones (symbol duration is 12.8 μs plus guard interval). Similarly, for full bandwidth non-data transmission, the frequency modulation plan 606 can span the frequency modulation area [-500:-4, 4:500], where every two frequencies are used for 2x LTF frequencies (whose code element duration is 6.4μs plus the protection interval). Similarly, for full bandwidth non-data transmission, the frequency modulation plan 604 can span the frequency modulation area [-500:-4, 4:500], where every four frequencies are used for 1x LTF frequencies (whose code element duration is 3.2μs plus the protection interval).

[0108] In the case of a punctured 80 MHz bandwidth channel 610 including four (4) 20 MHz subchannels or two 40 MHz subchannels (such that one of the subchannels is punctured), the LTF sequence within the NDP can be transmitted using a non-data frequency modulation plan that depends on which of the four 20 MHz subchannels (or two 40 MHz subchannels) is punctured and the symbol duration of the LTF sequence (1X, 2X, or 4X). Here, for 4X LTF, Table 600 shows that the non-data frequency modulation plan is the same as the OFDMA data frequency modulation plan. However, for 1X LTF and 2X LTF, Table 600 shows that the frequency modulation plans 604 and 606 vary depending on the symbol duration for the LFT sequence and the relative position of the punctured subchannel within the multiple subchannels, respectively.

[0109] Figure 7 An example method for wireless communication including generating and transmitting a long training field sequence for a null data packet according to some aspects. At step 702, a long training field (LTF) sequence for a null data packet (NDP) can be generated for transmission on a channel having a bandwidth that is an integer multiple of 80 MHz.

[0110] At step 704, the LTF sequence may be modulated onto a plurality of tones of the channel other than tones within a punctured subchannel of a plurality of subchannels of the channel, the modulation being based on the size and location of the punctured subchannel and a symbol duration associated with transmitting the LTF sequence. For example, modulating the LTF sequence onto a plurality of tones may be based on an orthogonal frequency division multiple access (OFDMA) data tone plan for an 80 MHz bandwidth channel or each 80 MHz segment of a wireless channel where the total channel bandwidth is an integer multiple of 80 MHz. Figure 6 The non-data frequency modulation (1x LTF, 2X LTF, or 4X LTF) explained in the figure may be used for modulation depending on the location of the perforated subchannel. In various examples, the perforated subchannel may have a bandwidth of 20 MHz or 40 MHz. According to some implementations, the channel may be a continuous 80 MHz wireless channel, a continuous 160 MHz wireless channel, a non-continuous 80 MHz + 80 MHz wireless channel, a continuous 240 MHz wireless channel, a non-continuous 160 MHz + 80 MHz channel, a continuous 320 MHz wireless channel, or a non-continuous 160 MHz + 160 MHz wireless channel.

[0111] In one example, the symbol duration associated with the LTF sequence is one of:

[0112] 12.8 μs plus a guard interval (4X LTF), 6.4 μs plus a guard interval (2X LTF), or 3.2 μs plus a guard interval (1X LTF), and the guard interval is one of 0.8 μs, 1.6 μs, or 3.2 μs.

[0113] According to some aspects, the symbol duration associated with the LTF sequence can be 12.8 μs plus a guard interval (4X LTF). In this case, each tone in the OFDMA data tone plan is used for modulation of the LTF sequence. In a specific example, when the bandwidth of the punctured subchannel is 20 MHz (in an 80 MHz bandwidth channel or in each 80 MHz segment of a wireless channel where the total channel bandwidth is an integer multiple of 80 MHz) and the multiple tones span a tone region of 1001 tones within a particular 80 MHz channel or segment, the multiple tones used to modulate the LTF sequence (e.g., Figure 6 The explanation in the text can be:

[0114] (a) each tone in the [-253:-12,12:253,259:500] tone region (in the case where the punctured subchannel is the first positioning subchannel);

[0115] (b) each tone in the [-500:-259,12:253,259:500] tone region (in the case where the punctured subchannel is a second positioning subchannel);

[0116] (c) each tone in the [-500:-259,-253:-12,259:500] tone region (in the case where the punctured subchannel is the third positioning subchannel); or

[0117] (d) Each tone in the tone region of [-500:-259, -253:-12, 12:253] (in the case where the punctured subchannel is the fourth positioning subchannel).

[0118] In another specific example, when the punctured subchannel has a bandwidth of 40 MHz (in an 80 MHz bandwidth channel or in each 80 MHz segment of a wireless channel in which the total channel bandwidth is an integer multiple of 80 MHz) and the multiple tones span a tone region of 1001 tones within a particular 80 MHz channel or segment, the multiple tones used to modulate the LTF sequence (e.g. Figure 6 The explanation in the text can be:

[0119] a) [12:253,259:500] each tone in the tone region (in the case where the punctured subchannel is the first positioning subchannel); or

[0120] b) Each tone in the [-500:-259,-253:-12] tone region (in the case where the punctured subchannel is the second positioning subchannel).

[0121] According to another aspect, the symbol duration associated with the LTF sequence can be 6.4 μs plus a guard interval (2XLTF). In this case, every other tone within the tone subset of the OFDMA data tone plan (i.e., each tone with an even index) is used for modulation of the LTF sequence. In a specific example, when the bandwidth of the punctured subchannel is 20 MHz (in an 80 MHz bandwidth channel or in each 80 MHz segment of a wireless channel in which the total channel bandwidth is an integer multiple of 80 MHz) and the multiple tones span a tone region of 1001 tones within a particular 80 MHz channel or segment, the multiple tones used to modulate the LTF sequence (e.g., Figure 6 The explanation in the text can be:

[0122] each tone in the [-252:2:-12,12:2:252,260:2:500] tone region (i.e., every other tone in the tone region [-252:-12,12:252,260:500]) (in the case where the punctured subchannel is the first positioned subchannel);

[0123] each tone in the [-500:2:-260,12:2:252,260:2:500] tone region (i.e., every other tone in the tone region [-500:-260,12:252,260:500]) (in the case where the punctured subchannel is the second positioning subchannel);

[0124] each tone in the [-500:2:-260,-252:2:-12,260:2:500] tone region (i.e., every other tone in the tone region [-500:-260,-252:-12,260:500]) (in the case where the punctured subchannel is the third positioning subchannel);

[0125] each tone in the [-500:2:-260,-252:2:-12,12:2:252] tone region (i.e., every other tone in the tone region [-500:-260,-252:-12,12:252]) (in the case where the punctured subchannel is the fourth positioning subchannel);

[0126] In another specific example, when the punctured subchannel has a bandwidth of 40 MHz (in an 80 MHz bandwidth channel or in each 80 MHz segment of a wireless channel in which the total channel bandwidth is an integer multiple of 80 MHz) and the multiple tones span a tone region of 1001 tones within a particular 80 MHz channel or segment, the multiple tones used to modulate the LTF sequence (e.g. Figure 6 ) can be: (a) each frequency tone in the frequency tone region [12:2:252,260:2:500] (i.e., each frequency tone with an even index in the frequency tone region [12:252,260:500]) (in the case where the perforated subchannel is the first positioning subchannel); or (b) each frequency tone in the frequency tone region [-500:2:-260,-252:2:-12] (i.e., each frequency tone with an even index in the frequency tone region [-500:-260,-252:-12]) (in the case where the perforated subchannel is the second positioning subchannel).

[0127] According to yet another aspect, when the symbol duration associated with the LTF sequence is 3.2 μs plus the guard interval (1X LTF), every fourth tone within the tone subset of the OFDMA tone plan may be used for modulation of the LTF sequence. In a specific example, when the bandwidth of the punctured subchannel is 20 MHz (in an 80 MHz bandwidth channel or in each 80 MHz segment of a wireless channel where the total channel bandwidth is an integer multiple of 80 MHz) and the multiple tones span a tone region of 1001 tones within a particular 80 MHz channel or segment, the multiple tones used to modulate the LTF sequence (e.g., Figure 6 The explanation in the text can be:

[0128] (a) Each tone in the tone region [-252:4:-12, 12:4:252, 260:4:500] (i.e., tone region

[0129] Every fourth tone in [-252:-12,12:252,260:500]) (in the case where the punctured subchannel is the first positioning subchannel);

[0130] (b) each tone in the [-500:4:-260,-252:4:-12,260:4:500] tone region (i.e., every fourth tone in the tone region [-500:-260,12:252,260:500]) (in the case where the punctured subchannel is the second positioning subchannel);

[0131] (c) each tone in the [-500:4:-260, -252:4:-12, 260:4:500] tone region (i.e., every fourth tone in the tone region [-500:-260, -252:-12, 260:500]) (in the case where the punctured subchannel is the third positioning subchannel); or

[0132] (d) Each tone in the tone region [-500:4:-260, -252:4:-12, 12:4:252] (i.e., tone region

[0133] [-500:-260,-252:-12,12:252]) (in the case where the punctured subchannel is the fourth positioning subchannel).

[0134] In another specific example, when the perforated subchannel has a bandwidth of 40 MHz (within an 80 MHz bandwidth channel or within each 80 MHz segment of a wireless channel in which the total channel bandwidth is an integer multiple of 80 MHz) and the multiple frequency tones span a frequency tone region of 1001 frequency tones within the particular 80 MHz channel or segment, the multiple frequency tones used to modulate the LTF sequence are: (a) each frequency tone in the [12:4:252,260:4:500] frequency tone region (i.e., every fourth frequency tone in the frequency tone region [12:252,260:500]) (when the perforated subchannel is the first positioning subchannel); or (b) each frequency tone in the [-500:4:-260,-252:4:-12] frequency tone region (i.e., every fourth frequency tone in the frequency tone region [-500:-260,-252:-12]) (when the perforated subchannel is the second positioning subchannel).

[0135] At step 706, the NDP including the LTF sequence is transmitted to the second wireless communication device via the channel.

[0136] Once the NDP is transmitted, channel state information (CSI) can be received in response to such transmission. However, a feedback tone set is required to define the grouping of subcarriers in the CSI feedback. Note that while IEEE 802.11ax defines a partial bandwidth CSI start / end tone index table for RU26 (resource unit with 26 tones) and provides coverage for the entire RU996 (996 tones) within each 80 MHz segment of an 80 MHz PPDU or a wireless channel where the total channel bandwidth is an integer multiple of 80 MHz, it is not aligned with the RU26 in the second and third 20 MHz in the IEEE 802.11be EHT80 tone plan. In addition, since 802.11ax defines 37 RU26s and IEEE 802.11be has 36 RU26s, the indexes are different.

[0137] According to some aspects, the same IEEE 802.11ax feedback tone definition for Ng=4 as for IEEE 802.11be may be reused. The entire set of feedback tones for Ng=4 is [-500:4:-4,4:4:500], but may be rewritten as [[-244:4:-4,0,4:4:244]-256,-8,-4,4,8,[-244:4:-4,0,4:4:244]+256], where [-244:4:-4,4:4:244] is the feedback tone for Ng=4 for HE40.

[0138] For partial bandwidth CSI feedback which includes only the CSI of the RU26 subset, it is necessary to define an Ng=4 CSI feedback start / end tone index table for 802.11be. Figure 8 One option illustrated in provides an example of a feedback start / end tone index table for Ng=4 for IEEE 802.11be. Figure 8 The table in can use a copy of the Ng=4 table for HE40 in two 40MHz subbands (with a frequency shift of -256 for the lower 40MHz tone and a frequency shift of +256 for the upper 40MHz tone), and have the adjacent RU add an overlay of 6 feedback tones (±4, ±8, ±256). For example, these 6 feedback tones may not be populated in the perforated NDP, and CSI feedback may be extrapolated for these tones in response to the perforated NDP. In another example, these tones only need to be sent in the case of non-punctured full 80MHz PPDU (or full 80MHz segment) CSI feedback, otherwise they do not need to be sent.

[0139] exist Fig. 9In another option illustrated in the example of the feedback start / end tone index table for Ng=4 for IEEE 802.11be, a replication of the Ng=4 table of HE40 may be employed, where 6 feedback tones (±4, ±8, ±256) are defined in the feedback tone set instead of in the Ng=4 table. These tones need only be sent in the case of a full 80 MHz PPDU (or full 80 MHz segment) CSI feedback without puncturing, and do not need to be sent otherwise.

[0140] Fig.17 Another option for the feedback start / end tone index table for Ng=4 in IEEE 802.11be is explained. The table is Fig. 9 Specifically, the 18th RU 26 is empty and the start and end tones of the second and third 20 MHz have been changed due to the shifting of the RUs.

[0141] In a general approach, if the tones in the feedback tone set are within the range of the RU start / end tone indices, then these tones should be feedback. Note that the puncturing of subchannels in the perforated NDP is based on RU242, and the tones defined in the feedback tone set but in the perforated RU242 should not be sent. For the 6 feedback tones (±4, ±8, ±256) for Ng=4, if these tones are not filled in the NDP (i.e., in the case of perforated NDP), these tones do not need to be sent. These tones only need to be sent in the case of non-punctured full 80MHz PPDU (or full 80MHz segment) CSI feedback, otherwise they do not need to be sent. Non-punctured full 80MHz PPDU (or full 80MHz segment) CSI feedback is defined as requesting all RUs within an 80MHz segment for an 80MHz non-punctured NDP from the 0th to the 35th RU or for a >80MHz NDP (in the case of no punctures in the 80MHz segment).

[0142] In another aspect, a table of CSI feedback start / end tone indexes defining Ng=16 for 802.11be may be provided. In one option, the feedback tone set for IEEE 802.11ax (feedback tones with Ng=16) may be reused for IEEE802.11be. The feedback tones with Ng=16 for HE80 are [-500:16:-4,4:16:500]. According to Fig.10 One option illustrated in the example of the feedback start / end tone index table for Ng=16 for IEEE802.11be, maintains the Ng=16 feedback tone for HE80 and revise / modify the table by making changes to the RUs in the second and third 20MHz as shown.

[0143] In one approach, to provide feedback tones ±4 for Ng=16, if these tones are not filled in the punctured NDP, interpolation can be used to obtain CSI feedback for these tones. In another approach, if these tones are not filled in the punctured NDP, in the case of partial bandwidth CSI feedback with punctured NDP, the feedback tones ±4 can be replaced by ±12 tones (which are filled tones in 1x / 2x / 4x LTF, are not in the Ng=16 feedback tone set, but are edge tones adjacent to RUs).

[0144] In another approach, in order to provide feedback tone ±260 for Ng=16, special handling may be performed depending on the scenario. For example, if the first 20MHz subchannel is punctured within an 80MHz bandwidth channel (or 80MHz segment), then for the 9th RU26 ([-252:-227] in the second 20MHz subchannel), the feedback tone -260 may be replaced by -252 (which is a padded tone in 1x / 2x / 4x LTF, is not in the Ng=16 feedback tone set, but is an edge tone of the 9th RU26). Additionally, if the fourth 20MHz subchannel is punctured within the 80MHz bandwidth channel (or 80MHz segment), then for the 26thRU26 ([227:252] in the third 20MHz subchannel), the feedback frequency +260 can be replaced by +252 (which is a padded frequency tone in the 1x / 2x / 4x LTF, is not in the Ng=16 feedback frequency tone set, but is an edge frequency tone of the 9thRU26).

[0145] In another approach, Fig.11 As explained in , these two feedback frequency modulations ±260 can be replaced in the Ng=16 table. Fig.11 Another example of a feedback start / end tone index table for Ng=16 for IEEE 802.11be is illustrated.

[0146] Fig.12Another example of a feedback start / end tone index table for Ng=16 for IEEE 802.11be is explained. In one approach, the feedback tone set can redefine the feedback tone for Ng=16 for IEEE 802.11be. In IEEE 802.11ax, the feedback tone for Ng=16 is [-500:16:-4,4:16:500]. In IEEE 802.11be, the feedback tone for Ng=16 can be redefined based on a replication of the feedback tone set for Ng=16 for HE40 in IEEE 802.11ax in each 40MHz subband (where the tone shift is -256 in the lower 40MHz and the tone shift is +256 in the upper 40MHz). The resulting set of feedback tones for Ng=16 for IEEE 802.11be is [[-244:16:-4,4:16:244]-256,-4,4,[-244:16:-4,4:16:244]+256]=[-500:16:-260,-252:16:-12,-4,4,12:16:252,260:500], where [-244:16:-4,4:16:244] is the feedback tone for Ng=16 for HE40.

[0147] According to an example, the Ng=16 feedback start / end tone index table for feedback tones can be based on a copy of the Ng=16 feedback start / end tone index table of HE40. Two feedback tones (±4) are defined in the feedback tone set but are not defined in the Ng=16 table. These tones may only need to be sent in the case of a full 80MHz PPDU (or full 80MHz segment) CSI feedback, otherwise they do not need to be sent.

[0148] Fig.13 Another option for the feedback start / end tone index table for Ng=16 in IEEE 802.11be is explained. Fig.12A slight variation of the approach explained in . Specifically, the Ng=16 feedback start / end tone index table of HE40 is replicated in each 40MHz subband, with the tone shift being -256 in the lower 40MHz and +256 in the upper 40MHz, and adjacent RUs provide coverage of two feedback tones (±4). These two feedback tones may not be filled in the LTF of the punctured NDP. In the case of feedback tones ±4 in response to the punctured NDP, one solution may be to interpolate to obtain CSI feedback for these tones. Another solution may be to replace these tones with ±12 (which are filled tones in 1x / 2x / 4x LTFs, are not in the Ng=16 feedback tone set, but are edge tones of adjacent RUs) in the case of partial BWCSI feedback with a punctured NDP.

[0149] Fig.18 Another option for the feedback start / end tone index table for Ng=4 in IEEE 802.11be is explained. The table is Fig.13 Specifically, the 18th RU 26 is empty and the start and end tones of the second and third 20 MHz have been changed due to the shifting of the RUs.

[0150] In a general approach, if the tones in the feedback tone set are within the range of the RU start / end tone indexes, then these tones are feedback. The puncturing of the subchannel is based on RU242, and these tones are defined in the feedback tone set, but in the case of punctured RU242, these tones should not be sent. For example, for the two feedback tones (±4) for Ng=16, if these tones are not filled in the LTF of the NDP (i.e., in the case of punctured NDP), these tones do not need to be sent. These tones only need to be sent in the case of non-punctured full 80MHz PPDU (or full 80MHz segment) CSI feedback, otherwise they do not need to be sent. Non-punctured full 80MHz PPDU (or full 80MHz segment) CSI feedback is defined as requesting all RUs within an 80MHz segment for an 80MHz non-punctured NDP from the 0th to the 35th RU or for a >80MHz NDP (in the case of no puncture in the 80MHz segment).

[0151] To accommodate PPDUs with bandwidths greater than 80MHz (such as 160 / 80+80 / 240 / 160+80 / 320 / 160+160MHz PPDUs), the tone plan can be a copy of the EHT80 tone plan. For Ng=4 and Ng=16, the LTF tones and feedback start / end tone indexes in the punctured NDP can be generalized as follows. The 80MHz segments in 80+80 / 160+80MHz use the same tone index. The 160MHz PPDU and 160MHz segments in 160+80 / 160+160MHz use [tone index -512, tone index +512]. The 320MHz PPDU uses [tone index -1536, tone index -512, tone index +512, tone index +1536]. Finally, the 240MHz PPDU uses [tone index -1536, tone index -512, tone index +512] or [tone index -512, tone index +512, tone index +1536].

[0152] The RU26 indexes in the start / end tone index table for 80MHz PPDU are from 0 to 35. And these RU26 indexes can be generalized as follows: (i) RU26 indexes for 160 / 80+80MHz PPDU are from 0 to 71, (ii) RU26 indexes for 240 / 160+80MHz PPDU are from 0 to 107, and (iii) RU26 indexes for 320 / 160+160MHz PPDU are from 0 to 143.

[0153] Reference again Figure 7 At step 708, channel state information (CSI) for the channel may be received in response to the transmitted NDP, the CSI comprising one feedback tone for each n warp grouped tones in a plurality of tones for the channel, where n=4 or 16, and wherein:

[0154] (a) the feedback tones at + / -4, + / -8 and + / -256 for n=4 are sent only if these tones are padded LTF tones and the feedback tones span the entire 80 MHz region; or

[0155] (b) feedback tones at + / -4, + / -8 and + / -256 for n=4 and feedback tone at + / -4 for n=16 are extrapolated from at least one adjacent padded LTF tone of the plurality of tones of the channel if those tones are not padded LTF tones; or

[0156] (c) The feedback tones at + / - 4 for n=16 are replaced in the feedback with tones at + / - 12 for n=16 if these tones are not padded LTF tones.

[0157] In one example, the set of feedback tones for n=4 is defined as [-500:4:-4, 4:4:500], which spans every 3rd tone region of 1001 tones [-500:500] with a DC gap between [-2:2].

[0158] In one example, for n=4 feedback tone sets may be defined as [-500:4:-4,4:4:500], which spans a region of every 3 tones of 1001 tones [-500:500] with a DC gap between [-2:2]. Feedback tones at + / -4, + / -8, and + / -256 are not sent when the corresponding tones in the NDP are not filled.

[0159] In another example, the feedback tone set for n=16 is defined as [-500:16:-4, 4:16:500], which spans every 15th tone region of 1001 tones [-500:500] with a DC tone region between [-2:2].

[0160] In yet another example, the set of feedback tones for n=16 is defined as [-500:16:-260,-252:16:-12,-4,4,12:16:252,260:500], which spans a region of every 15th tone of 1001 tones [-500:-260,-252:-12,-4,4,12:252,260:500] with a DC tone region between [-2:2].

[0161] In some implementations, feedback tones at + / - 4 are not sent when the corresponding tones in the NDP are not filled.

[0162] The Null Data Packet Announcement (NDPA) is typically sent by a base station to identify the intended recipient and the format of the upcoming sounding frame, and is followed by a sounding NDP. In IEEE 802.11ax, the NDPA has a 14-bit Fractional Bandwidth Information subfield, which includes a 7-bit RU Start Index subfield and a 7-bit RU End Index subfield.

[0163] IEEE 802.11be may use fractional bandwidth CSI feedback with the same RU26 granularity as in 802.11ax. Alternatively, 802.11be may limit fractional bandwidth CSI feedback with 20 MHz granularity (RU242).

[0164] In some aspects for IEEE 802.11be, RU26 granularity may be used for fractional bandwidth channel state information (CSI) feedback. Thus, there are a total of 36x4=144 RU26s in a 320MHz PPDU, 8 bits are required to represent the RU start index, and 8 bits are required to represent the RU end index (a total of 16 bits for the fractional bandwidth information subfield in NDPA).

[0165] In another aspect for IEEE 802.11be, RU242 granularity can be used for fractional bandwidth CSI feedback. In such a case, there are a total of 4x4=16 RU242 in a 320MHz PPDU, 4 bits are required for the RU start index and 4 bits are required for the RU end index (a total of 8 bits for the fractional bandwidth information subfield in NDPA).

[0166] To reduce the size of the information subfield in NDPA, some aspects propose to use RU242 start / end indexes in 802.11be NDPA if the fractional bandwidth CSI feedback request has 20 MHz granularity.

[0167] Fig.14 An OFDMA feedback start / end tone index table for an 80 MHz bandwidth channel (or an 80 MHz segment of a larger bandwidth channel that is a multiple of 80 MHz) that may have a granularity of 20 MHz is illustrated. In this example, the table defines feedback start / end tone indexes 1400 for channel state information (CSI), where the CSI includes one feedback tone for every n warp-grouped tones of a plurality of tones for the channel, where n=4 or 16.

[0168] The general approach may be designed to accommodate channels having various bandwidth portions.Channel state information (CSI) for a channel may be received in response to the transmitted NDP, the CSI comprising one feedback tone for every n warped grouped tones in a plurality of tones for the channel, where n=4 or 16. The CSI may be indicated by a feedback start and end tone index table for each 26 tone RU that: (a) replicates the High Efficiency (HE) feedback start / end tone index table for a 40 MHz bandwidth channel to form a complete table for an 80 MHz physical layer convergence protocol (PLCP) protocol data unit (PPDU), (b) the feedback start / end tone index for RU26 in the first 40 MHz is based on the start / end tone index of the HE feedback start / end tone index table for 40 MHz shifted by -256 tones, and (c) the feedback start / end tone index for RU26 in the second 40 MHz is based on the start / end tone index of the HE feedback start / end tone index table for 40 MHz shifted by +256 tones. The same feedback start / end tone index table is used for channels having a bandwidth portion in an 80 MHz segment within an 80+80 MHz or 160+80 MHz PPDU. For channels having bandwidth portions in 160 MHz, 160+80 MHz, or 160+160 MHz segments within a PPDU, the feedback start / end tone index table is a copy of two tables for 80 MHz, with the tone indexes shifted by -512 tones in the lower 80 MHz for RU26 and by +512 tones in the upper 80 MHz for RU26, respectively. For channels having bandwidth portions in 320 MHz PPDUs, the feedback start / end tone index table is a copy of four tables for 80 MHz, with the tone indexes shifted by -1536 tones in the first 80 MHz for RU26, -512 tones in the second 80 MHz for RU26, +512 tones in the third 80 MHz for RU26, and +1536 tones in the fourth 80 MHz for RU26. For channels having bandwidth portions in 240 MHz segments, the feedback start / end tone index table is a copy of three tables for 80 MHz, where the tone indices are: (a) shifted by -1536 tones in the first 80 MHz for RU26, -512 tones in the second 80 MHz for RU26, and +512 tones in the third 80 MHz for RU26, respectively, or (b) shifted by -512 tones in the first 80 MHz for RU26, +512 tones in the second 80 MHz for RU26, and +1536 tones in the third 80 MHz for RU26, respectively.

[0169] Fig.19A specific example of an OFDMA feedback start / end tone index table for a partial 80MHz bandwidth channel (or an 80MHz segment of a larger bandwidth channel that is a multiple of 80MHz) at RU242 granularity is illustrated, where the feedback does not cover the entire 80MHz bandwidth channel or segment. In this table, the Fig.14 The start / end index of the n warp group frequency tones for Ng=4 or Ng=16. Note that for 160MHz bandwidth channel and 320MHz bandwidth channel, the feedback frequency tone set of 80MHz bandwidth channel is replicated in each 80MHz segment. Within the entire 80MHz bandwidth channel or each 80MHz segment of 160MHz or 320MHz bandwidth channel, if a RU242 is not within the range of the feedback request, only the feedback frequency tones of the remaining RU242 in the 80MHz bandwidth channel or segment that are within the range of the feedback request are sent.

[0170] Specifically, for feedback of a portion or segment of an 80 MHz bandwidth channel, RU242 index 1 is [-500:Ng:-260], index 2 is [-252:Ng:-12], index 3 is [12:Ng:252], and index 4 is [260:Ng:500].

[0171] Similarly, for feedback of a portion or segment of a 160 MHz bandwidth channel, RU242 index 1 is [-1012:Ng:-772], index 2 is [-764:Ng:-524], index 3 is [-500:Ng:-260], index 4 is [-252:Ng:-12], index 5 is [12:Ng:252], index 6 is [260:Ng:500], index 7 is [524:Ng:764], and index 8 is [772:Ng:1012].

[0172] Similarly, for feedback of a portion or segment of a 320 MHz bandwidth channel, RU242 index 1 is [-2036:Ng:-1796], index 2 is [-1788:Ng:-1548], index 3 is [-1524:Ng:-1284], index 4 is [-1276:Ng:-1036], index 5 is [-1012:Ng:-722], index 6 is [-764:Ng:-524], and index 7 is [-500:Ng:-260] , index 8 is [-252:Ng:-12], index 9 is [12:Ng:252], index 10 is [260:Ng:500], index 11 is [524:Ng:764], index 12 is [772:Ng:1012], index 13 is [1036:Ng:1276], index 14 is [1284:Ng:1524], index 15 is [1548:Ng:1788], and index 16 is [1796:Ng:2036].

[0173] Fig. 20 is a table illustrating a specific example of OFDMA feedback start / end tone indexing for an entire 80 MHz bandwidth channel at RU996 granularity using n warp group tones Ng=4, where the feedback covers the entire 80 MHz bandwidth channel. Note that for 160 MHz bandwidth channels and 320 MHz bandwidth channels, the feedback tone set for the 80 MHz bandwidth channel is replicated in each 80 MHz segment. If the entire 80 MHz bandwidth channel or each 80 MHz segment of the 160 MHz or 320 MHz bandwidth channel is within the scope of the feedback request, the feedback tone for the RU996 corresponding to that 80 MHz is sent.

[0174] Specifically, for the feedback of the entire 80 MHz bandwidth channel, RU996 index 1 is [-500:4:-4,4:4:500].

[0175] Similarly, for feedback of the entire 80 MHz segment within a 160 MHz bandwidth channel, RU996 index 1 is [-1012:4:-516,-508:4:-12], and index 2 is [12:4:508,516:4:1012].

[0176] Similarly, for feedback of the entire 80MHz segment within a 320MHz bandwidth channel, RU996 index 1 is [-2036:4:-1540,-1532:4:-1036], index 2 is [-1012:4:-516,-508:4:-12], index 3 is [12:4:508,516:4:1012], and index 4 is [1036:4:1532,1540:4:2036].

[0177] Fig.21 is a table illustrating a specific example of OFDMA feedback start / end tone indexes for an entire 80 MHz bandwidth channel for RU996 granularity using n warp group tones Ng=16, where the feedback covers the entire 80 MHz bandwidth channel.

[0178] Note that for 160MHz bandwidth channels and 320MHz bandwidth channels, the feedback tone set of the 80MHz bandwidth channel is replicated in each 80MHz segment. If the entire 80MHz bandwidth channel or each 80MHz segment of the 160MHz or 320MHz bandwidth channel is within the scope of the feedback request, the feedback tone of RU996 corresponding to that 80MHz is sent.

[0179] Specifically, for the feedback of the entire 80 MHz bandwidth channel, RU996 index 1 is [-500:16:-260,-252:16:-12,-4,4,12:16:252,260:16:500].

[0180] Similarly, for feedback of the entire 80 MHz segment within a 160 MHz bandwidth channel, RU996 index 1 is [-1012:16:-772,764:16:-524,-516,-508,-500:16:-260,-252:16:-12] and index 2 is [12:16:252,260:16:500,508,516,524:16:764,772:16:1012].

[0181] Similarly, for the feedback of the entire 80MHz segment within the 320MHz bandwidth channel, RU996 index 1 is [-2036:16:-1796,-1788:16:-1548,-1540,-1532,-1524:16:-1284,-1276:16:1036] and index 2 is [-1012:16:-772,-764:16:-524,-516,-508, -500:16:-260,-252:16:-12], index 3 is [12:16:252,260:16:500,508,516,524:16:764,772:16:1012], and index 4 is [1036:16:1276,1284:16:1524,1532,1540,1548:16:1788,1796:16:2036].

[0182] Fig.15An example method 1500 for wireless communication including generating and transmitting a blanking data packet announcement (NDPA) according to some aspects. In step 1502, a blanking data packet announcement (NDPA) can be obtained or generated for transmission on a channel, the NDPA including a partial bandwidth information subfield, the partial bandwidth information subfield including one of the following: (a) a 16-bit subfield for identifying a 26-frequency modulation resource unit (RU) start index and an end index, or (b) an 8-bit subfield for identifying a 242-frequency modulation resource unit (RU) start index and an end index, the partial bandwidth information subfield identifying an indexed range of feedback frequencies for channel state information (CSI).

[0183] At step 1504, a long training field (LTF) sequence may be generated for a null data packet (NDP) for transmission on a channel having a bandwidth that is an integer multiple of 80 MHz.

[0184] At step 1506, the LTF sequence may be modulated onto a plurality of tones of the channel other than tones within a punctured subchannel of a plurality of subchannels of the channel, the modulation being based on the size and location of the punctured subchannel and the symbol duration associated with transmitting the LTF sequence.

[0185] At step 1508, the NDPA may be transmitted to the second wireless communication device via the channel.

[0186] At step 1510, the NDP including the LTF sequence may also be transmitted to a second wireless communication device via the channel.

[0187] In one example, a 26-tone RU may be used for CSI feedback granularity, and the 16-bit subfield includes an 8-bit start index and an 8-bit end index.

[0188] At step 1512, channel state information (CSI) for a channel may be received in response to the transmitted NDP, the CSI comprising one feedback tone for every n grouped tones in a plurality of tones for the channel, where n=4 or 16.

[0189] In one implementation where n=4, the CSI is indicated by a feedback start and end tone index table for each 26-tone RU that replicates the high-efficiency (HE) feedback start / end tone index table for a 40MHz bandwidth channel to form a complete table for an 80MHz physical layer convergence protocol (PLCP) protocol data unit (PPDU). The feedback start / end tone index for RU26 in the first 40MHz is based on the start / end tone index of the HE feedback start / end tone index table for 40MHz shifted by -256 tones. The feedback start / end tone index for RU26 in the second 40MHz is based on the start / end tone index of the HE feedback start / end tone index table for 40MHz shifted by +256 tones. The feedback start and end tone index table for each 26-tone RU can further provide coverage of additional feedback tones by using adjacent RUs, where the additional feedback tones are (±4, ±8, ±256).

[0190] exist Figure 8 In the example illustrated for n=4, the feedback start / end tone indexes for an 80 MHz bandwidth channel include the following start / end tone indexes:

[0191] For the 0th indexed RU [-500, -472],

[0192] For the first indexed RU [-476, -448],

[0193] For the second indexed RU [-448, -420],

[0194] For the 3rd indexed RU [-420, -392],

[0195] For the 4th indexed RU [-392, -364],

[0196] For the 5th indexed RU [-368, -340],

[0197] For the 6th indexed RU [-340, -312],

[0198] For the 7th indexed RU [-312, -284],

[0199] For the 8th indexed RU [-288, -256],

[0200] For the 9th indexed RU [-256, -224],

[0201] For the 10th indexed RU [-228, -200],

[0202] For the 11th indexed RU [-200, -172],

[0203] For the 12th indexed RU [-172, -144],

[0204] For the 13th indexed RU [-148, -120],

[0205] For the 14th indexed RU [-120, -92],

[0206] For the 15th indexed RU of [-92,-64],

[0207] For the 16th indexed RU of [-64,-36],

[0208] For the 17th indexed RU [-40, -4],

[0209] For the 18th indexed RU [4,40],

[0210] For the 19th indexed RU [36,64],

[0211] For the 20th indexed RU [64,92],

[0212] For the 21st indexed RU [92,120],

[0213] For the 22nd indexed RU [120,148],

[0214] For the 23rd indexed RU [144,172],

[0215] For the 24th indexed RU [172,200],

[0216] For the 25th indexed RU [200,228],

[0217] For the 26th indexed RU [224,256],

[0218] For the 27th indexed RU [256,288],

[0219] For the 28th indexed RU [284,312],

[0220] For the 29th indexed RU [312,340],

[0221] For the 30th indexed RU [340,368],

[0222] For the 31st indexed RU [364,392],

[0223] For the 32nd indexed RU [392,420],

[0224] For the 33rd indexed RU [420,448],

[0225] [448,476] for the 34th indexed RU, and

[0226] [472,500] for the 35th indexed RU.

[0227] exist Fig. 9 In the example illustrated for n=4, the feedback start / end tone indexes for an 80 MHz bandwidth channel include the following start / end tone indexes:

[0228] For the 0th indexed RU [-500, -472],

[0229] [-476, -448] for the 1st indexed RU, [-448, -420] for the 2nd indexed RU, [-420, -392] for the 3rd indexed RU, [-392, -364] for the 4th indexed RU, [-368, -340] for the 5th indexed RU, [-340, -312] for the 6th indexed RU, [-312, -284] for the 7th indexed RU, [-288, -364] for the 8th indexed RU. -256] for the 9th indexed RU, [-252, -224] for the 10th indexed RU, [-228, -200] for the 11th indexed RU, [-200, -172] for the 12th indexed RU, [-172, -144] for the 13th indexed RU, [-148, -120] for the 14th indexed RU, [-120, -92] for the 15th indexed RU, [-92, -64] for the 16th indexed RU. [-64,-36] for the 17th indexed RU, [-40,-12] for the 18th indexed RU, [12,40] for the 19th indexed RU, [36,64] for the 20th indexed RU, [64,92] for the 21st indexed RU, [92,120] for the 22nd indexed RU, [120,148] for the 23rd indexed RU, [144,172] for the 24th indexed RU. 0], [200,228] for the 25th indexed RU, [224,252] for the 26th indexed RU, [260,288] for the 27th indexed RU, [284,312] for the 28th indexed RU, [312,340] for the 29th indexed RU, [340,368] for the 30th indexed RU, [364,392] for the 31st indexed RU, [392,420] for the 32nd indexed RU,

[0230] For the 33rd indexed RU [420,448],

[0231] [448,476] for the 34th indexed RU, and

[0232] [472,500] for the 35th indexed RU.

[0233] In another implementation where n=16, the CSI may be indicated by a feedback start and end tone index table for each 26-tone RU defined based on a high efficiency (HE) feedback start / end tone index table for an 80 MHz bandwidth channel.

[0234] exist Fig.10In the first example illustrated for n=16, the feedback start / end tone indexes for an 80 MHz bandwidth channel include the following start / end tone indexes:

[0235] For the 0th indexed RU [-500, -468],

[0236] For the first indexed RU [-484, -436],

[0237] For the second indexed RU [-452, -420],

[0238] For the 3rd indexed RU [-420, -388],

[0239] For the 4th indexed RU [-404, -356],

[0240] For the 5th indexed RU [-372, -340],

[0241] For the 6th indexed RU [-340, -308],

[0242] For the 7th indexed RU [-324, -276],

[0243] For the 8th indexed RU [-292, -260],

[0244] For the 9th indexed RU [-260, -212],

[0245] For the 10th indexed RU [-228, -196],

[0246] For the 11th indexed RU [-212, -164],

[0247] For the 12th indexed RU [-180, -132],

[0248] For the 13th indexed RU [-148, -116],

[0249] For the 14th indexed RU [-132, -84],

[0250] For the 15th indexed RU [-100, -52],

[0251] For the 16th indexed RU [-68, -36],

[0252] For the 17th indexed RU [-52, -4],

[0253] For the 18th indexed RU [4,52],

[0254] For the 19th indexed RU [36,68],

[0255] For the 20th indexed RU [52,100],

[0256] For the 21st indexed RU [84,132],

[0257] For the 22nd indexed RU [116,148],

[0258] For the 23rd indexed RU [132,180],

[0259] For the 24th indexed RU [164,212],

[0260] For the 25th indexed RU [196,228],

[0261] For the 26th indexed RU [212,260],

[0262] For the 27th indexed RU [260,292],

[0263] For the 28th indexed RU [276,324],

[0264] For the 29th indexed RU [308,340],

[0265] For the 30th indexed RU [340,372],

[0266] For the 31st indexed RU [356,404],

[0267] For the 32nd indexed RU [388,420],

[0268] For the 33rd indexed RU [420,452],

[0269] [436,484] for the 34th indexed RU, and

[0270] [468,500] for the 35th indexed RU.

[0271] exist Fig.11 In the second example illustrated for n=16, the feedback start / end tone indexes for an 80 MHz bandwidth channel include the following start / end tone indexes:

[0272] For the 0th indexed RU [-500, -468],

[0273] For the first indexed RU [-484, -436],

[0274] For the second indexed RU [-452, -420],

[0275] For the 3rd indexed RU [-420, -388],

[0276] For the 4th indexed RU [-404, -356],

[0277] For the 5th indexed RU [-372, -340],

[0278] For the 6th indexed RU [-340, -308],

[0279] For the 7th indexed RU [-324, -276],

[0280] For the 8th indexed RU [-292, -260],

[0281] For the 9th indexed RU [-252, -212],

[0282] For the 10th indexed RU [-228, -196],

[0283] For the 11th indexed RU [-212, -164],

[0284] For the 12th indexed RU [-180, -132],

[0285] For the 13th indexed RU [-148, -116],

[0286] For the 14th indexed RU [-132, -84],

[0287] For the 15th indexed RU [-100, -52],

[0288] For the 16th indexed RU [-68, -36],

[0289] For the 17th indexed RU [-52, -4],

[0290] For the 18th indexed RU [4,52],

[0291] For the 19th indexed RU [36,68],

[0292] For the 20th indexed RU [52,100],

[0293] For the 21st indexed RU [84,132],

[0294] For the 22nd indexed RU [116,148],

[0295] For the 23rd indexed RU [132,180],

[0296] For the 24th indexed RU [164,212],

[0297] For the 25th indexed RU [196,228],

[0298] For the 26th indexed RU [212,252],

[0299] For the 27th indexed RU [260,292],

[0300] For the 28th indexed RU [276,324],

[0301] For the 29th indexed RU [308,340],

[0302] For the 30th indexed RU [340,372],

[0303] For the 31st indexed RU [356,404],

[0304] For the 32nd indexed RU [388,420],

[0305] For the 33rd indexed RU [420,452],

[0306] [436,484] for the 34th indexed RU, and

[0307] [468,500] for the 35th indexed RU.

[0308] exist Fig.12 In the third example illustrated for n=16, the feedback start / end tone indexes for an 80 MHz bandwidth channel include the following start / end tone indexes:

[0309] For the 0th indexed RU [-500, -468],

[0310] For the first indexed RU [-484, -436],

[0311] For the second indexed RU [-452, -420],

[0312] For the 3rd indexed RU [-420, -388],

[0313] For the 4th indexed RU [-404, -356],

[0314] For the 5th indexed RU [-372, -340],

[0315] For the 6th indexed RU [-340, -308],

[0316] [-324, -276] for the 7th indexed RU, [-292, -260] for the 8th indexed RU, [-252, -220] for the 9th indexed RU, [-236, -188] for the 10th indexed RU, [-204, -172] for the 11th indexed RU, [-172, -140] for the 12th indexed RU, [-156, -1 08], [-124,-92] for the 14th indexed RU, [-92,-60] for the 15th indexed RU, [-76,-28] for the 16th indexed RU, [-44,-12] for the 17th indexed RU, [12,44] for the 18th indexed RU, [28,76] for the 19th indexed RU, [60,92] for the 20th indexed RU, [-76,-28] for the 21st indexed RU RU, [92,124] for the 22nd indexed RU, [108,156] for the 23rd indexed RU, [140,172] for the 24th indexed RU, [172,204] for the 25th indexed RU, [188,236] for the 26th indexed RU, [220,252] for the 27th indexed RU, [260,292] for the 28th indexed RU, [276, 324] for the 29th indexed RU, [308,340] for the 30th indexed RU, [340,372] for the 31st indexed RU, [356,404] for the 31st indexed RU, [388,420] for the 32nd indexed RU, [420,452] for the 33rd indexed RU, [436,484] for the 34th indexed RU, and [468,500] for the 35th indexed RU.

[0317] exist Fig.13 In the fourth example illustrated for n=16, the feedback start / end tone indexes for the 80 MHz bandwidth channel include the following start / end tone indexes:

[0318] For the 0th indexed RU [-500, -468],

[0319] For the first indexed RU [-484, -436],

[0320] For the second indexed RU [-452, -420],

[0321] For the 3rd indexed RU [-420, -388],

[0322] For the 4th indexed RU [-404, -356],

[0323] For the 5th indexed RU [-372, -340],

[0324] For the 6th indexed RU [-340, -308],

[0325] For the 7th indexed RU [-324, -276],

[0326] For the 8th indexed RU [-292, -260],

[0327] For the 9th indexed RU [-252, -220],

[0328] For the 10th indexed RU [-236, -188],

[0329] For the 11th indexed RU [-204, -172],

[0330] For the 12th indexed RU [-172, -140],

[0331] For the 13th indexed RU [-156, -108],

[0332] For the 14th indexed RU of [-124,-92],

[0333] For the 15th indexed RU of [-92, -60],

[0334] For the 16th indexed RU [-76, -28],

[0335] For the 17th indexed RU [-44, -4],

[0336] For the 18th indexed RU [4,44],

[0337] For the 19th indexed RU [28,76],

[0338] For the 20th indexed RU [60,92],

[0339] For the 21st indexed RU [92,124],

[0340] For the 22nd indexed RU [108,156],

[0341] For the 23rd indexed RU [140,172],

[0342] For the 24th indexed RU [172,204],

[0343] For the 25th indexed RU [188,236],

[0344] For the 26th indexed RU [220,252],

[0345] For the 27th indexed RU [260,292],

[0346] For the 28th indexed RU [276,324],

[0347] For the 29th indexed RU [308,340],

[0348] For the 30th indexed RU [340,372],

[0349] For the 31st indexed RU [356,404],

[0350] For the 32nd indexed RU [388,420],

[0351] For the 33rd indexed RU [420,452],

[0352] [436,484] for the 34th indexed RU, and

[0353] [468,500] for the 35th indexed RU.

[0354] In some implementations, a 242-tone RU may be used for CSI feedback granularity, and an 8-bit subfield includes a 4-bit start index and a 4-bit end index. Channel state information (CSI) about a channel may be received in response to a transmitted NDP, the CSI including one feedback tone for each n warp-grouped tones in a plurality of tones for the channel, where n=4 or 16.

[0355] exist Fig.14 In one example illustrated in , where n=4, the CSI may be indicated by a feedback start and end tone index table for each 242 tone RU, the feedback start and end tone index table comprising:

[0356] (a) providing indexed tones [-500:4:-260] for feedback for the first 20 MHz sub-channel,

[0357] (b) providing indexed tones [-252:4:-12] for feedback for the second 20 MHz subchannel,

[0358] (c) providing an indexed tone [12:4:252] for feedback for the third 20 MHz subchannel, and

[0359] (d) Indexed tone [260:4:500] providing feedback for the fourth 20 MHz subchannel.

[0360] Also in Fig.14 In another example illustrated in , where n=16, the CSI may be indicated by a feedback start and end tone index table for each 242 tone RU, the feedback start and end tone index table comprising:

[0361] (a) providing indexed tones [-500:16:-260] for feedback for the first 20 MHz sub-channel,

[0362] (b) providing indexed tones [-252:16:-12] for feedback for the second 20 MHz subchannel,

[0363] (c) providing an indexed tone for feedback for the third 20 MHz subchannel [12:16:252], and

[0364] (d) Indexed tone [260:16:500] providing feedback for the fourth 20 MHz sub-channel.

[0365] exist Fig.19 In the example illustrated for a 242 tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone indexes for an 80 MHz bandwidth channel include the following start / end tone indexes:

[0366] For the first indexed RU [-500, -260],

[0367] For the second indexed RU [-252, -12],

[0368] [12,252] for the 3rd indexed RU, and

[0369] [260,500] for the 4th indexed RU.

[0370] Likewise, in Fig.19 In the example illustrated for a 242 tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone indexes for a 160 MHz bandwidth channel include the following start / end tone indexes:

[0371] For the first indexed RU [-1012, -772],

[0372] For the second indexed RU [-764, -524],

[0373] For the 3rd indexed RU [-500, -260],

[0374] For the 4th indexed RU [-252, -12],

[0375] For the 5th indexed RU [12,252],

[0376] For the 6th indexed RU [260,500],

[0377] [524,764] for the 7th indexed RU, and

[0378] [772,1012] for the 8th indexed RU.

[0379] Similarly, in Fig.19 In the example illustrated for a 242 tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone indexes for a 320 MHz bandwidth channel include the following start / end tone indexes:

[0380] For the first indexed RU [-2036, -1796],

[0381] For the second indexed RU [-1788, -1548],

[0382] For the 3rd indexed RU [-1524, -1284],

[0383] For the 4th indexed RU [-1276, -1036],

[0384] For the 5th indexed RU [-1012, -772],

[0385] For the 6th indexed RU [-764, -524],

[0386] For the 7th indexed RU [-500, -260],

[0387] For the 8th indexed RU [-252, -12],

[0388] For the 9th indexed RU [12,252],

[0389] For the 10th indexed RU [260,500],

[0390] For the 11th indexed RU [524,764],

[0391] For the 12th indexed RU [772,1012],

[0392] For the 13th indexed RU [1036,1276],

[0393] For the 14th indexed RU [1284,1524],

[0394] [1548,1788] for the 15th indexed RU, and

[0395] For the 16th indexed RU [1796,2036].

[0396] Within the entire 80MHz bandwidth channel or each 80MHz segment of the 160MHz or 320MHz bandwidth channel, if a certain RU242 is not within the scope of the feedback request, only the feedback frequency tones of the remaining RU242 in the 80MHz that are within the scope of the feedback request are sent. Otherwise, if the entire 80MHz bandwidth channel or each 80MHz segment of the 160MHz or 320MHz bandwidth channel is within the scope of the feedback request, the feedback frequency tones of the RU996 corresponding to the 80MHz are sent. For example, for the NDP of the 80MHz bandwidth channel, if only certain 20MHz sub-channels within the 80MHz bandwidth channel are requested, the feedback frequency tones of the RU242 corresponding to these 20MHz sub-channels are used. In this case, the six feedback frequency tones indexes [-256, -8, -4, +4, +8, +256] for Ng=4 and the two feedback frequency tones [-4, +4] for Ng=16 do not belong to any RU242 and are not feedback frequency tones. On the other hand, if the entire 80 MHz is in the feedback request, the entire feedback tone set of the 80 MHz bandwidth channel (which corresponds to the feedback tones of RU996) is used. In this case, the six feedback tone indices [-256, -8, -4, +4, +8, +256] for Ng = 4 and the two feedback tones [-4, +4] for Ng = 16 belong to RU996 and are feedback tones.

[0397] In another example, for the NDP of a 160 MHz bandwidth channel, if only certain 20 MHz subchannels within each 80 MHz segment are requested, the feedback tones of RU242 corresponding to these 20 MHz subchannels are used. In this case, if the entire lower 80 MHz segment is not requested, the six feedback tone indices [-768, -520, -516, -508, -504, -256] (also rewritten as [-256, -8, -4, +4, +8, +256] -512) for Ng=4 and the two feedback tones [-516, -508] (also rewritten as [-4, +4] -512) for Ng=16 do not belong to any RU242 and are not feedback tones. In this case, if the entire upper 80 MHz segment is not requested, the six feedback tone indices [256, 504, 508, 516, 520, 768] (also rewritten as [-256, -8, -4, +4, +8, +256] + 512) for Ng = 4 and the two feedback tones [508, 516] (also rewritten as [-4, +4] + 512) for Ng = 16 do not belong to any RU242 and are not feedback tones. On the other hand, if the entire lower or upper 80 MHz segment is in the feedback request, the feedback tone of RU996 corresponding to the 80 MHz segment(s) is used. In this case, if the entire lower 80 MHz segment is being requested, the 6 feedback tone indices [-768, -520, -516, -508, -504, -256] (also rewritten as [-256, -8, -4, +4, +8, +256] -512) for Ng=4 and the 2 feedback tones [-516, -508] (also rewritten as [-4, +4] -512) for Ng=16 belong to the lower RU242 and are feedback tones. If the entire upper 80MHz segment is being requested, the 6 feedback tone indices [256,504,508,516,520,768] (also rewritten as [-256,-8,-4,+4,+8,+256]+512) for Ng=4 and the 2 feedback tones [508,516] (also rewritten as [-4,+4]+512) for Ng=16 belong to the upper RU996 and are feedback tones.

[0398] In another example, for the NDP of a 320MHz bandwidth channel, if only certain 20MHz subchannels within each 80MHz segment are requested, the feedback tones of RU242 corresponding to these 20MHz subchannels are used. The six feedback tone indices [-1792, -1544, -1540, -1532, -1528, -1280] (also rewritten as [-256, -8, -4, +4, +8, +256] -1536) and 2 feedback tones [-1540, -1532] (also rewritten as [-4, 4] -1536) for Ng=4 belonging only to the lowest RU996 and not to any RU242 are feedback tones only when the entire lower 80MHz segment within the 320MHz bandwidth of the channel is being requested. The six feedback tone indices [-768, -520, -516, -508, -504, -256] (also rewritten as [-256, -8, -4, +4, +8, +256] -512) for Ng=4 and the two feedback tone indices [-516, -508] (also rewritten as [-4, +4] -512) for Ng=16 that belong only to the second lowest RU996 and not to any RU242 are feedback tones only when the entire second lowest 80MHz segment within the 320MHz bandwidth of the channel is being requested. Only when the entire third lowest 80MHz segment within the 320MHz bandwidth of the channel is being requested, the six feedback frequency tone indices [256,504,508,516,520,768] (also rewritten as [-256,-8,-4,+4,+8,+256]+512) for Ng=4 and the two feedback frequency tones [508,516] (also rewritten as [-4,+4]+512) for Ng=16 belonging only to the third lowest RU996 and not any RU242 are feedback frequencies. The six feedback tones [1280, 1528, 1532, 1540, 1544, 1792] (also rewritten as [-256, -8, -4, +4, +8, +256] + 1536) and the two feedback tones [1532, 1540] (also rewritten as [-4, 4] + 1536) for Ng = 4 belonging only to the top RU996 and not to any RU242 are feedback tones only when the entire top 80 MHz segment within the 320 MHz bandwidth of the channel is being requested.

[0399] exist Fig. 20 In the example illustrated for 996 tone RUs with n=4 feedback tone intervals, the set of feedback tone indices for an 80 MHz bandwidth channel is:

[0400] [-500:4:-4,4:4:500] for the 1st indexed RU.

[0401] exist Fig. 20In another example illustrated in 996 tone RUs for n=4 feedback tone intervals, the set of feedback tone indices for the entire 80 MHz segment within a 160 MHz bandwidth channel is:

[0402] [-1012:4:-516,-508:4:-12] for the 1st indexed RU, and

[0403] [12:4:508,516:4:1012] for the 2nd indexed RU.

[0404] Likewise, in Fig. 20 In another example illustrated in 996 tone RUs for n=4 feedback tone intervals, the set of feedback tone indices for the entire 80 MHz segment within a 320 MHz bandwidth channel is:

[0405] For the first indexed RU [-2036:4:-1540,-1532:4:-1036],

[0406] For the second indexed RU [-1012:4:-516,-508:4:-12],

[0407] [12:4:508,516:4:1012] for the 3rd indexed RU, and

[0408] [1036:4:1532,1540:4:2036] for the 4th indexed RU.

[0409] exist Fig.21 In the example illustrated for 996 tone RUs with n=16 feedback tone intervals, the set of feedback tone indices for an 80 MHz bandwidth channel is:

[0410] [-500:16:-260,-252:16:-12,-4,4,12:16:252,260:16:500] for the 1st indexed RU.

[0411] exist Fig.21 In another example illustrated in 996 tone RUs for n=16 feedback tone intervals, the set of feedback tone indices for the entire 80 MHz segment within a 160 MHz bandwidth channel is:

[0412] [-1012:16:-772,764:16:-524,-516,-508,-500:16:-260,-252:16:-12] for the 1st indexed RU, and

[0413] [12:16:252,260:16:500,508,516,524:16:764,772:16:1012] for the 2nd indexed RU.

[0414] Likewise, in Fig.21 In another example illustrated in 996 tone RUs for n=16 feedback tone intervals, the set of feedback tone indices for the entire 80 MHz segment within a 320 MHz bandwidth channel is:

[0415] For the first indexed RU [-2036:16:-1796,-1788:16:-1548,-1540,-1532,-1524:16:-1284,-1276:16:1036],

[0416] For the 2nd indexed RU [-1012:16:-772,-764:16:-524,-516,-508,-500:16:-260,-252:16:-12],

[0417] [1036:16:1276,1284:16:1524,1532,1540,1548:16:1788,1796:16:2036] for the 4th indexed RU.

[0418] Fig. 22 An example method 2200 for wireless communication is provided for providing fractional bandwidth feedback in response to receiving a punctured blanking data packet.

[0419] In step 2202, the wireless communication device may receive a null data packet (NDP) from a first wireless device on a channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto multiple frequency tones of the channel other than frequency tones within a perforated subchannel of multiple subchannels of the channel, the modulation being based on the size and position of the perforated subchannel and the symbol duration associated with transmission of the LTF sequence.

[0420] In step 2204, the wireless device may obtain and / or generate channel state information (CSI) about the channel in response to receiving an NDP having a feedback request for at least a portion of the channel bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth portion of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI including one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and the CSI is modulated in an indexed range of feedback tones within 242 tone resource units (RU) or 996 tone resource units (RU).

[0421] In step 2206, the wireless device may also receive a blank data packet announcement (NDPA) from the first wireless device on the channel, the NDPA including a partial bandwidth information subfield, the partial bandwidth information subfield including an 8-bit subfield for identifying a start index and an end index of a 242 frequency-tuning resource unit (RU), the partial bandwidth information subfield identifying an indexed range of feedback frequencies for channel state information (CSI).

[0422] In step 2208, the wireless device may transmit the CSI to the first wireless device.

[0423] The LTF sequence may be modulated onto multiple tones based on an Orthogonal Frequency Division Multiple Access (OFDMA) data tone plan for an 80 MHz bandwidth channel or an OFDMA data tone plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz.

[0424] Fig.16 1 is a block diagram illustrating an example of a wireless device adapted to facilitate the use of a channel with a bandwidth greater than 80 MHz to communicate punctured null data packets and partial bandwidth feedback. The wireless device 1600 may be, for example, an access point or a user station, and may be implemented with a processing system 1614 including one or more processors 1604. Examples of processor 1604 include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. In various examples, the AP 1600 may be configured to perform any one or more of the functions described herein. That is, the processor 1604 as utilized in the AP 1600 may be used to implement the various functions described herein. Figure 6 , 7 , 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20 and 21.

[0425] In this example, the processing system 1614 may be implemented with a bus architecture generally represented by bus 1602. Depending on the specific application and overall design constraints of the processing system 1614, the bus 1602 may include any number of interconnecting buses and bridges. The bus 1602 communicatively couples various circuits including one or more processors (generally represented by processor 1604), memory 1605, and computer-readable media (generally represented by computer-readable media 1606). The bus 1602 may also link various other circuits, such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further. The bus interface 1608 provides an interface between the bus 1602 and the wireless transceiver 1610 (including a transmitter and a receiver). The wireless transceiver 1610 provides a communication interface or means for communicating with various other equipment over a transmission medium. For example, wireless transceiver 1610 may transmit to and receive from one or more wireless devices using one or more antennas 1616 and in accordance with an IEEE 802.11 protocol, such as IEEE 802.11be. In one implementation, wireless transceiver 1610 may operate in accordance with a multiple-input multiple-output (MIMO) mode.

[0426] The processor 1604 is responsible for managing the bus 1602 and general processing, including the execution of software stored on the computer-readable medium 1606. The software, when executed by the processor 1604, causes the processing system 1614 to perform the various functions described below for any particular device. The computer-readable medium 1606 and the memory 1605 may also be used to store data manipulated by the processor 1604 when executing the software.

[0427] In one or more examples, the processor 1604 may include an OFDMA modulation circuit 1640, an OFDMA demodulation circuit 1642, and a long training field generator circuit 1644 for a punctured null data packet (NDP). In one example, the long training field generator circuit 1644 may be used to obtain an EHT-LTF sequence for a 320 MHz bandwidth channel. The OFDMA modulation circuit 1640 may be used to modulate the EHT-LTF sequence and the data field into an OFDM signal for transmission. The OFDMA demodulation circuit 1642 may be used to demodulate a received OFDM signal.

[0428] One or more processors 1604 in the processing system can execute software. Software should be broadly interpreted to mean instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether described in software, firmware, middleware, microcode, hardware description language, or other terms. The software may reside on a computer-readable medium 1606. The computer-readable medium 1606 may be a non-transitory computer-readable medium. As examples, non-transitory computer readable media include magnetic storage devices (such as hard disks, floppy disks, magnetic tapes), optical disks (such as compact disks (CDs) or digital versatile disks (DVDs)), smart cards, flash memory devices (such as card, stick, or key-type drives), random access memory (RAM), read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), registers, removable disks, and any other suitable medium for storing software or instructions that can be accessed and read by a computer. Computer readable medium 1606 may reside in processing system 1614, external to processing system 1614, or distributed across multiple entities including processing system 1614. Computer readable medium 1606 may be implemented in a computer program product. As an example, a computer program product may include a computer readable medium in packaging materials. Those skilled in the art will recognize how to best implement the described functionality presented throughout this disclosure depending on the specific application and the overall design constraints imposed on the overall system.

[0429] In one or more examples, the computer-readable storage medium 1606 may include OFDMA modulation instructions 1650, OFDMA demodulation instructions 1652, or long training field instructions for punctured NDP 1654. Of course, in the above examples, the circuit system included in the processor 1604 is provided only as an example, and other means for performing the described functions may be included within various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 1606, or any other suitable equipment or means described in any of the processes or algorithms described herein.

[0430] In one mode of operation, it is contemplated that the wireless device 1600 generates and transmits a punctured NDP with a sequence of LTFs and receives channel feedback information. In another mode of operation, the wireless device 1600 may receive a punctured NDP with a sequence of LTFs and then estimate and transmit channel state information based on the received LTFs.

[0431] Aspect 1: A method for wireless communication by a wireless communication device, comprising: obtaining a long training field (LTF) sequence for a null data packet (NDP) for transmission on a channel having a bandwidth that is an integer multiple of 80 MHz; modulating the LTF sequence onto a plurality of frequency tones of the channel other than a frequency tone within a perforated subchannel of a plurality of subchannels of the channel, the modulation being based on a size and position of the perforated subchannel and a symbol duration associated with transmitting the LTF sequence; and transmitting the NDP including the LTF sequence to a second wireless communication device via the channel.

[0432] Aspect 2: The method of Aspect 1 further includes: generating a blank data packet announcement (NDPA) for transmission on the channel, the NDPA including a partial bandwidth information subfield, the partial bandwidth information subfield including an 8-bit subfield for identifying a start index and an end index of a 242 frequency-tuning resource unit (RU), the partial bandwidth information subfield identifying an indexed range of feedback frequency tuning for channel state information (CSI); transmitting the NDPA to a second wireless communication device via the channel.

[0433] Aspect 3: A method as in either Aspect 1 or 2, wherein the LTF sequence is modulated onto the multiple tones based on an orthogonal frequency division multiple access (OFDMA) data frequency modulation plan for an 80 MHz bandwidth channel or an OFDMA data frequency modulation plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz.

[0434] Aspect 4: A method as in any of Aspects 1, 2 or 3, wherein the codeword duration associated with the LTF sequence is one of: 12.8 μs plus a protection interval, 6.4 μs plus a protection interval, or 3.2 μs plus a protection interval, and wherein the protection interval is one of 0.8 μs, 1.6 μs or 3.2 μs.

[0435] Aspect 5: A method as in any one of Aspects 1, 2, 3 or 4, wherein the symbol duration associated with the LTF sequence is 12.8 μs plus the guard interval, and wherein the LTF sequence is modulated onto each tone within a plurality of tone ranges of an OFDMA data tone plan, and the channel comprises an 80 MHz bandwidth portion including a punctured subchannel; the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 tones; and the plurality of tone ranges: comprising tones [-253:-12,12 based on the punctured subchannel being the first 20 MHz subchannel :253,259:500], based on the perforated subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel and including the frequency modulation [-500:-259,12:253,259:500], based on the perforated subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel and including the frequency modulation [-500:-259,-253:-12,259:500], or based on the perforated subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel and including the frequency modulation [-500:-259,-253:-12,12:253]. Aspect 6: A method as in any one of Aspects 1, 2, 3 or 4, wherein the symbol duration associated with the LTF sequence is 12.8 μs plus the protection interval, and wherein the LTF sequence is modulated onto each frequency tone within a plurality of frequency tone ranges of an OFDMA data frequency tone plan, the channel comprising an 80 MHz bandwidth portion including a perforated subchannel; the perforated subchannel having a 40 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprising 1001 frequency tones; and the plurality of frequency tone ranges: comprising frequency tones [12:253,259:500] based on the perforated subchannel being a first 40 MHz subchannel, or comprising frequency tones [-500:-259,-253:-12] based on the perforated subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel.

[0436] Aspect 7: A method as in any one of Aspects 1, 2, 3 or 4, wherein the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, and the LTF sequence is modulated onto every other frequency tone within a plurality of frequency tone ranges of an OFDMA data frequency tone plan, and the channel comprises an 80 MHz bandwidth portion including a punctured subchannel; the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 frequency tones; and the plurality of frequency tone ranges: comprising frequency tones [-252:2:-12,12:2:252,260 based on the punctured subchannel being the first 20 MHz subchannel :2:500], based on the perforated subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel and including the frequency modulation [-500:2:-260,12:2:252,260:2:500], based on the perforated subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel and including the frequency modulation [-500:2:-260,-252:2:-12,260:2:500], or based on the perforated subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel and including the frequency modulation [-500:2:-260,-252:2:-12,12:2:252].

[0437] Aspect 8: A method as in any one of Aspects 1, 2, 3 or 4, wherein the symbol duration associated with the LTF sequence is 6.4 μs plus the protection interval, and the LTF sequence is modulated onto every other frequency tone within a plurality of frequency tone ranges of an OFDMA data frequency tone plan, and the channel comprises an 80 MHz bandwidth portion including a perforated subchannel; the perforated subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 frequency tones; and the plurality of frequency tone ranges: comprise frequency tones [12:2:252, 260:2:500] based on the perforated subchannel being a first 40 MHz subchannel, or comprise frequency tones [-500:2:-260, -252:2:-12] based on the perforated subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel.

[0438] Aspect 9: A method as in any one of Aspects 1, 2, 3 or 4, wherein the symbol duration associated with the LTF sequence is 3.2 μs plus the guard interval, and the LTF sequence is modulated onto every fourth frequency tone within a plurality of frequency tone ranges of an OFDMA data frequency tone plan, and the channel comprises an 80 MHz bandwidth portion including a punctured subchannel; the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 frequency tones; and the plurality of frequency tone ranges: comprising frequency tones [-252:4:-12,12:4:252,260 based on the punctured subchannel being the first 20 MHz subchannel :4:500], based on the perforated subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel and including the frequency modulation [-500:4:-260,12:4:252,260:4:500], based on the perforated subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel and including the frequency modulation [-500:4:-260,-252:4:-12,260:4:500], or based on the perforated subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel and including the frequency modulation [-500:4:-260,-252:4:-12,12:4:252].

[0439] Aspect 10: A method as in any one of Aspects 1, 2, 3 or 4, wherein the symbol duration associated with the LTF sequence is 3.2 μs plus the protection interval, and the LTF sequence is modulated onto every fourth frequency tone within a plurality of frequency tone ranges of an OFDMA data frequency tone plan, and the channel comprises an 80 MHz bandwidth portion including a perforated subchannel; the perforated subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth portion; the 80 MHz bandwidth portion comprises 1001 frequency tones; and the plurality of frequency tone ranges: comprise frequency tones [12:4:252,260:4:500] based on the perforated subchannel being a first 40 MHz subchannel, or comprise frequency tones [-500:4:-260,-252:4:-12] based on the perforated subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel.

[0440] Aspect 11: A method as in any of Aspects 1, 2 or 3, further comprising: receiving channel state information (CSI) about the channel in response to transmitting an NDP with a partial feedback request, wherein the partial feedback request covers an 80 MHz bandwidth portion of a channel less than an 80 MHz bandwidth or a channel less than a 160 MHz bandwidth or a 320 MHz bandwidth, the CSI comprising one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and wherein the CSI is received in an indexed range of feedback tones within 242 tone resource units (RUs).

[0441] Aspect 12: A method as in Aspect 11, wherein for a 242-tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone index for an 80 MHz bandwidth channel comprises the following start / end tone indexes: (a) providing indexed tone [-500, -260] for feedback for a first 20 MHz subchannel of the 80 MHz bandwidth channel, (b) providing indexed tone [-252, 12] for feedback for a second 20 MHz subchannel of the 80 MHz bandwidth channel, (c) providing indexed tone [12, 252] for feedback for a third 20 MHz subchannel of the 80 MHz bandwidth channel, and (d) providing indexed tone [260, 500] for feedback for a fourth 20 MHz subchannel of the 80 MHz bandwidth channel.

[0442] Aspect 13: A method as in aspect 11, wherein for a 242-tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone index for the 80 MHz bandwidth portion of the 160 MHz bandwidth channel comprises the following start / end tone indexes:

[0443] [-1012, -772] for the 1st indexed RU, [-764, -524] for the 2nd indexed RU, [-500, -260] for the 3rd indexed RU, [-252, -12] for the 4th indexed RU, [12, 252] for the 5th indexed RU, [260, 500] for the 6th indexed RU, [524, 764] for the 7th indexed RU, and [772, 1012] for the 8th indexed RU.

[0444] Aspect 14: A method as in Aspect 11, wherein for 242 frequency-tone RUs with n=4 or n=16 feedback frequency-tone intervals, the feedback start / end frequency-tone indexes for the 80 MHz bandwidth portion of the 320 MHz bandwidth channel include the following start / end frequency-tone indexes: [-2036, -1796] for the 1st indexed RU, [-1788, -1548] for the 2nd indexed RU, [-1524, -1284] for the 3rd indexed RU, [-1276, -1036] for the 4th indexed RU, [-1012, -772] for the 5th indexed RU, [-764, -1284] for the 6th indexed RU. 524] for the 7th indexed RU, [-500,-260] for the 8th indexed RU, [-252,-12] for the 9th indexed RU, [12,252] for the 10th indexed RU, [260,500] for the 11th indexed RU, [524,764] for the 12th indexed RU, [772,1012] for the 13th indexed RU, [1036,1276] for the 13th indexed RU, [1284,1524] for the 14th indexed RU, [1548,1788] for the 15th indexed RU, and [1796,2036] for the 16th indexed RU.

[0445] Aspect 15: The method of Aspect 1 further includes: receiving channel state information (CSI) about the channel in response to transmitting an NDP with a feedback request for the entire channel bandwidth, the feedback request covering the entire 80 MHz bandwidth channel or the 160 MHz bandwidth channel or the entire 80 MHz bandwidth portion of the 320 MHz bandwidth channel, the CSI including one feedback frequency tone for every n grouped frequency tones in a plurality of frequency tones of the channel, where n=4 or 16, and the CSI is received in an indexed range of feedback frequency tones within 996 frequency tone resource units (RUs).

[0446] Aspect 16: A method as in either Aspect 1 or 15, wherein the feedback tone set for the entire 80 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone intervals is defined as [-500:4:-4,4:4:500], spanning a region of every 3 tones of 1001 tones [-500 to +500] and having a DC tone region between [-4:4].

[0447] Aspect 17: A method as in either Aspect 1 or 15, wherein the set of feedback tones for the entire 160 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) indexed tones [-1012:4:-516, -508:4:-12] providing feedback for a first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:4:508, 516:4:1012] providing feedback for a second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0448] Aspect 18: A method as in any of Aspects 1 or 15, wherein the set of feedback tones for the entire 320 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) providing indexed tones [-2036:4:-1540, -1532:4:-1036] for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel, (b) providing indexed tones for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel, (c) providing indexed frequency modulation [12:4:508,516:4:1012] for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel, and (d) providing indexed frequency modulation [1036:4:1532,1540:4:2036] for feedback of the second 80 MHz subchannel of the 320 MHz bandwidth channel.

[0449] Aspect 19: A method as in either Aspect 1 or 15, wherein the set of feedback tones for the entire 80 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning a region of every 15 tones of 1001 tones [-500:500] and having a DC tone region between [-4:4].

[0450] Aspect 20: A method as in either Aspect 1 or 15, wherein the set of feedback tones for the entire 160 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) indexed tones [-1012:16:-772, 764:16:-524, -516, -508, -500:16:-260, -252:16:-12] providing feedback for a first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:16:252, 260:16:500, 508, 516, 524:16:764, 772:16:1012] providing feedback for a second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0451] Aspect 21: A method as in any of Aspects 1 or 15, wherein the set of feedback tones for the entire 320 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) indexed tones providing feedback for a first 80 MHz subchannel of the 320 MHz bandwidth channel [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036], (b) indexed tones providing feedback for a second 80 MHz subchannel of the 320 MHz bandwidth channel [-1 012:16:-772,-764:16:-524,-516,-508,-500:16:-260,-252:16:-12], (c) providing indexed frequency modulation for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012], and (d) providing indexed frequency modulation for feedback of the second 80 MHz subchannel of the 320 MHz bandwidth channel [1036:16:1276,1284:16:1524,1532,1540,1548:16:1788,1796:16:2036].

[0452] Aspect 22: A wireless communication device, comprising: at least one processor; and at least one memory communicatively coupled to the at least one processor and storing processor-readable code, the processor-readable code being configured, when executed by the at least one processor, to: obtain a long training field (LTF) sequence for a null data packet (NDP) for transmission on a channel having a bandwidth that is an integer multiple of 80 MHz; modulate the LTF sequence onto a plurality of frequency tones of the channel other than a frequency tone within a perforated subchannel of a plurality of subchannels of the channel, the modulation being based on a size and position of the perforated subchannel and a symbol duration associated with transmitting the LTF sequence; and transmit the NDP including the LTF sequence to a second wireless communication device via the channel.

[0453] Aspect 23: A wireless communication device as in Aspect 22, wherein the at least one processor is further configured to: generate a blank data packet announcement (NDPA) for transmission on the channel, the NDPA comprising a partial bandwidth information subfield, the partial bandwidth information subfield comprising an 8-bit subfield for identifying a start index and an end index of a 242 frequency-tuning resource unit (RU), the partial bandwidth information subfield identifying an indexed range of feedback frequencies for channel state information (CSI); and transmit the NDPA to a second wireless communication device via the channel.

[0454] Aspect 24: A wireless communication device as in either Aspect 22 or 23, wherein the LTF sequence is modulated onto the multiple tones based on an orthogonal frequency division multiple access (OFDMA) data frequency modulation plan for an 80 MHz bandwidth channel or an OFDMA data frequency modulation plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz.

[0455] Aspect 25: A method for wireless communication by a wireless communication device, comprising: receiving a blank data packet (NDP) from a first wireless device on a channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated to a plurality of tones of the channel other than a tone within a punctured subchannel of a plurality of subchannels of the channel, the modulation being based on a size and position of the punctured subchannel and a symbol duration associated with transmission of a LTF sequence; in response to receiving the NDP having a feedback request for at least a portion of the channel bandwidth Generate channel state information (CSI) about the channel, the feedback request covers at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth portion of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI includes one feedback frequency tone for every n coded group frequency tones among a plurality of frequency tones of the channel, where n=4 or 16, and the CSI is modulated in a range of coded indices of the feedback frequency tones within 242 frequency tone resource units (RU) or 996 frequency tone resource units (RU); and transmit the CSI to the first wireless device.

[0456] Aspect 26: The method of Aspect 25 further includes: receiving a blank data packet announcement (NDPA) from the first wireless device on the channel, the NDPA including a partial bandwidth information subfield, the partial bandwidth information subfield including an 8-bit subfield for identifying a start index and an end index of a 242 frequency-tuning resource unit (RU), the partial bandwidth information subfield identifying an indexed range of feedback frequency tuning for channel state information (CSI).

[0457] Aspect 27: A method as in either Aspect 25 or 26, wherein the LTF sequence is modulated onto the multiple tones based on an orthogonal frequency division multiple access (OFDMA) data frequency modulation plan for an 80 MHz bandwidth channel or an OFDMA data frequency modulation plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz.

[0458] Aspect 28: A method as in any of Aspects 25, 26 or 27, wherein the feedback request is a partial feedback request for an 80 MHz bandwidth portion of a channel with a bandwidth less than 80 MHz or a channel with a bandwidth less than 160 MHz or a 320 MHz bandwidth, the CSI comprises one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and wherein the CSI is modulated in an indexed range of feedback tones within 242 tone resource units (RUs).

[0459] Aspect 29: A method as in any of Aspects 25, 26, 27 or 28, wherein for a 242-tone RU with n=4 or n=16 feedback tone intervals, the feedback start / end tone indices for an 80 MHz bandwidth channel include the following start / end tone indices: (a) providing indexed tone [-500, -260] for feedback for a first 20 MHz subchannel of the 80 MHz bandwidth channel, (b) providing indexed tone [-252, 12] for feedback for a second 20 MHz subchannel of the 80 MHz bandwidth channel, (c) providing indexed tone [12, 252] for feedback for a third 20 MHz subchannel of the 80 MHz bandwidth channel, and (d) providing indexed tone [260, 500] for feedback for a fourth 20 MHz subchannel of the 80 MHz bandwidth channel.

[0460] Aspect 30: A method as in any one of Aspects 25, 26, 27 or 28, wherein for 242 frequency-tuned RUs with n=4 or n=16 feedback frequency-tuning intervals, the feedback start / end frequency-tuning indexes for the 80 MHz bandwidth portion of the 160 MHz bandwidth channel include the following start / end frequency-tuning indexes: [-1012, -772] for the 1st indexed RU, [-764, -524] for the 2nd indexed RU, [-500, -260] for the 3rd indexed RU, [-252, -12] for the 4th indexed RU, [12, 252] for the 5th indexed RU, [260, 500] for the 6th indexed RU, [524, 764] for the 7th indexed RU, and [772, 1012] for the 8th indexed RU.

[0461] Aspect 31: A method as in any one of Aspects 25, 26, 27 or 28, wherein for 242 frequency-tuned RUs with n=4 or n=16 feedback frequency-tuned intervals, the feedback start / end frequency-tuned indexes for the 80 MHz bandwidth portion of the 320 MHz bandwidth channel include the following start / end frequency-tuned indexes: [-2036, -1796] for the 1st indexed RU, [-1788, -1548] for the 2nd indexed RU, [-1524, -1284] for the 3rd indexed RU, [-1276, -1036] for the 4th indexed RU, [-1012, -772] for the 5th indexed RU, [-1012, -772] for the 6th indexed RU [-764, -524] for the 7th indexed RU, [-500, -260] for the 8th indexed RU, [-252, -12] for the 9th indexed RU, [12, 252] for the 10th indexed RU, [260, 500] for the 11th indexed RU, [524, 764] for the 12th indexed RU, [772, 1012] for the 13th indexed RU, [1036, 1276] for the 13th indexed RU, [1284, 1524] for the 14th indexed RU, [1548, 1788] for the 15th indexed RU, and [1796, 2036] for the 16th indexed RU.

[0462] Aspect 32: A method as in any of Aspects 25, 26 or 27, wherein the feedback request is a complete feedback request covering the entire 80 MHz bandwidth channel or the entire 80 MHz bandwidth portion of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI includes one feedback tone for every n grouped tones of a plurality of tones of the channel, where n=4 or 16, and wherein the CSI is modulated in an indexed range of feedback tones within 996 tone resource units (RUs).

[0463] Aspect 33: A method as in any of Aspects 25, 26, 27 or 32, wherein the feedback tone set for the entire 80 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone intervals is defined as [-500:4:-4,4:4:500], spanning a region of every 3 tones of 1001 tones [-500 to +500] and having a DC tone region between [-4:4].

[0464] Aspect 34: A method as in any of Aspects 25, 26, 27 or 32, wherein the set of feedback tones for the entire 160 MHz bandwidth channel within a 996-tone RU with n=4 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) indexed tones [-1012:4:-516, -508:4:-12] providing feedback for a first 80 MHz subchannel of the 160 MHz bandwidth channel, and (b) indexed tones [12:4:508, 516:4:1012] providing feedback for a second 80 MHz subchannel of the 160 MHz bandwidth channel.

[0465] Aspect 35: A method as in any of Aspects 25, 26, 27 or 32, wherein the set of feedback tones for the entire 320 MHz bandwidth channel within a 996-tone RU of n=4 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) indexed tones [-2036:4:-1540, -1532:4:-1036] providing feedback for the first 80 MHz subchannel of the 320 MHz bandwidth channel, (b) providing indexed frequency modulation [-1012:4:-516, -508:4:-12] for feedback of the second 80 MHz subchannel of the 320 MHz bandwidth channel, (c) providing indexed frequency modulation [12:4:508, 516:4:1012] for feedback of the first 80 MHz subchannel of the 320 MHz bandwidth channel, and (d) providing indexed frequency modulation [1036:4:1532, 1540:4:2036] for feedback of the second 80 MHz subchannel of the 320 MHz bandwidth channel.

[0466] Aspect 36: A method as in any of Aspects 25, 26, 27 or 32, wherein the set of feedback tones for the entire 80 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning a region of every 15 tones of 1001 tones [-500:500] and having a DC tone region between [-4:4].

[0467] Aspect 37: A method as in any of Aspects 25, 26, 27 or 32, wherein the set of feedback tones for the entire 160 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) an indexed tone providing feedback for the first 80 MHz subchannel of the 160 MHz bandwidth channel [- 1012:16:-772,764:16:-524,-516,-508,-500:16:-260,-252:16:-12], and (b) indexed frequency modulation [12:16:252,260:16:500,508,516,524:16:764,772:16:1012] providing feedback for a second 80 MHz sub-channel of a 160 MHz bandwidth channel.

[0468] Aspect 38: A method as in any of Aspects 25, 26 or 27, wherein the set of feedback tones for the entire 320 MHz bandwidth channel within a 996-tone RU with n=16 feedback tone intervals is indicated by a feedback start and end tone index table for each 996-tone RU, the feedback start and end tone index table comprising: (a) indexed tones providing feedback for a first 80 MHz subchannel of the 320 MHz bandwidth channel [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036], (b) indexed tones providing feedback for a second 80 MHz subchannel of the 320 MHz bandwidth channel [ -1012:16:-772,-764:16:-524,-516,-508,-500:16:-260,-252:16:-12], (c) providing indexed frequency modulation for feedback of the first 80 MHz sub-channel of the 320 MHz bandwidth channel [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012], and (d) providing indexed frequency modulation for feedback of the second 80 MHz sub-channel of the 320 MHz bandwidth channel [1036:16:1276,1284:16:1524,1532,1540,1548:16:1788,1796:16:2036].

[0469] Aspect 39: A wireless communication device comprising: at least one processor; and at least one memory communicatively coupled to the at least one processor and storing processor-readable code, the processor-readable code being configured, when executed by the at least one processor, to: receive a null data packet (NDP) from a first wireless device on a channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the channel other than a tone within a punctured subchannel of a plurality of subchannels of the channel, the modulation being based on a size and position of the punctured subchannel and a symbol duration associated with transmission of an LTF sequence ; generating channel state information (CSI) about the channel in response to receiving an NDP with a feedback request for at least a portion of the channel bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth portion of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI including one feedback tone for every n grouped tones among a plurality of tones of the channel, where n=4 or 16, and the CSI is modulated in an indexed range of feedback tones within 242 tone resource units (RU) or 996 tone resource units (RU); and transmitting the CSI to a first wireless device.

[0470] Aspect 40: A wireless communication device as in Aspect 39, wherein the at least one processor is further configured to: receive a null data packet announcement (NDPA) from a first wireless device on the channel, the NDPA comprising a partial bandwidth information subfield, the partial bandwidth information subfield comprising an 8-bit subfield for identifying a start index and an end index of a 242 frequency-tuned resource unit (RU), the partial bandwidth information subfield identifying a range of coded indices of feedback frequency tuning for channel state information (CSI).

[0471] Aspect 41: A wireless communication device as in either Aspect 39 or 40, wherein the LTF sequence is modulated onto the multiple tones based on an orthogonal frequency division multiple access (OFDMA) data frequency modulation plan for an 80 MHz bandwidth channel or an OFDMA data frequency modulation plan for each 80 MHz segment of a channel having a bandwidth that is an integer multiple of 80 MHz.

[0472] As used herein, "or" is intended to be interpreted in an inclusive sense unless otherwise expressly indicated. For example, "a or b" may include only a, only b, or a combination of a and b. As used herein, a phrase that refers to "at least one of" or "one or more of" a list of items refers to any combination of those items, including individual members. For example, "at least one of a, b, or c" is intended to cover the following examples: only a, only b, only c, a combination of a and b, a combination of a and c, a combination of b and c, and a combination of a, b, and c.

[0473] The various illustrative components, logic, logic blocks, modules, circuits, operations, and algorithmic processes described in conjunction with the implementations disclosed herein may be implemented as electronic hardware, firmware, software, or a combination of hardware, firmware, or software, including the structures disclosed in this specification and their structural equivalents. This interchangeability of hardware, firmware, and software has been generally described in terms of their functionality and is illustrated in the various illustrative components, blocks, modules, circuits, and processes described above. Whether such functionality is implemented in hardware, firmware, or software depends on the specific application and the design constraints imposed on the overall system.

[0474] Various modifications to the implementations described in this disclosure may be apparent to those of ordinary skill in the art, and the universal principles defined herein may be applied to other implementations without departing from the spirit or scope of the disclosure. Thus, the claims are not intended to be limited to the implementations shown herein, but should be granted the widest scope consistent with the disclosure, the principles and novel features disclosed herein.

[0475] In addition, various features described in this specification in the context of separate implementations may also be implemented in combination in a single implementation. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations separately or in any suitable subcombination. Thus, while features may be described above as functioning in a particular combination and even initially claimed as such, one or more features from a claimed combination may in some cases be removed from the combination, and a claimed combination may be directed to a subcombination, or a variation of a subcombination.

[0476] Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring such operations to be performed in the particular order shown or in a sequential order, or to perform all the illustrated operations to achieve the desired result. In addition, the accompanying drawings may schematically depict one or more example processes in the form of a flow chart or a flow diagram. However, other operations that are not depicted may be incorporated into the example processes schematically illustrated. For example, one or more additional operations may be performed before, after, simultaneously or between any illustrated operations. In some environments, multitasking and parallel processing may be advantageous. In addition, the separation of various system components in the implementation described above should not be understood as requiring such separation in all implementations, and it should be understood that the described program components and systems can generally be integrated together in a single software product or packaged into multiple software products.

Claims

1. A method for wireless communication by a wireless communication device, comprising: modulating a long training field (LTF) sequence for a null data packet (NDP) onto a plurality of tones of a wireless channel comprising one or more 80 MHz bandwidth segments, the modulation excluding tones within a punctured subchannel of a plurality of subchannels of the 80 MHz bandwidth segments of the wireless channel, the modulation based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence, wherein: (a) the symbol duration associated with the LTF sequence is 12.8 μs plus a guard interval, the LTF sequence is modulated onto each tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: Based on the punctured subchannel being the first 20 MHz subchannel and comprising the tones [-253:-12, 12:253, 259:500], comprising the tones [-500:-259, 12:253, 259:500] based on the punctured subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, Based on the punctured subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, the frequency tone includes [-500:-259, -253:-12, 259:500], or based on the punctured subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel, the frequency tone includes [-500:-259, -253:-12, 12:253], (b) the symbol duration associated with the LTF sequence is 12.8 μs plus the guard interval, the LTF sequence is modulated onto each tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: Based on the punctured subchannel being the first 40 MHz subchannel, comprising the tones [12:253, 259:500], or comprising tones [-500:-259, -253:-12] based on the punctured subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel, (c) the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, the LTF sequence is modulated onto every other tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: Based on the punctured subchannel being the first 20 MHz subchannel and comprising the tones [-252:2:-12, 12:2:252, 260:2:500], comprising tones [-500:2:-260, 12:2:252, 260:2:500] based on the punctured subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, comprising the tones [-500:2:-260, -252:2:-12, 260:2:500] based on the punctured subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, or comprising the tones [-500:2:-260, -252:2:-12, 12:2:252] based on the punctured subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel, or (d) the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, the LTF sequence is modulated onto every other tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: comprising the tones [12:2:252, 260:2:500] based on the punctured subchannel being the first 40 MHz subchannel, or comprising tones [-500:2:-260, -252:2:-12] based on the punctured subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel; and The NDP including the modulated LTF sequence is transmitted to a second wireless communication device via the wireless channel. 2 . The method of claim 1 , wherein the guard interval is one of 0.8 μs, 1.6 μs, or 3.2 μs.

3. A method for wireless communication by a wireless communication device, comprising: modulating a long training field (LTF) sequence for a null data packet (NDP) onto a plurality of tones of a wireless channel comprising one or more 80 MHz bandwidth segments, the modulation excluding tones within a punctured subchannel of a plurality of subchannels of the 80 MHz bandwidth segments of the wireless channel, the modulation based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; transmitting, via the wireless channel, to a second wireless communication device, the NDP including the modulated LTF sequence, the NDP including a feedback request; as well as receiving channel state information (CSI) about the wireless channel in response to transmitting the NDP, wherein the CSI regarding one or more 242-tone resource units (RUs) comprises one feedback tone for every n grouped tones of the plurality of tones of the wireless channel, the CSI being included in an indexed range of feedback tones within a feedback 242-tone resource unit (RU) having an interval of n=4 or 16 feedback tones, and for each feedback 242-tone RU, further performing one of the following: (1) The wireless channel is an 80 MHz bandwidth channel, and the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-500, -260], For the second indexed RU [-252, -12], [12,252] for the 3rd indexed RU, and [260,500] for the 4th indexed RU, (2) The wireless channel is a 160 MHz bandwidth channel, and the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-1012, -772], For the second indexed RU [-764, -524], For the 3rd indexed RU [-500, -260], For the 4th indexed RU [-252, -12], For the 5th indexed RU [12,252], For the 6th indexed RU [260,500], [524,764] for the 7th indexed RU, and [772,1012] for the 8th indexed RU, or (3) The wireless channel is a 320 MHz bandwidth channel, and the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-2036, -1796], For the second indexed RU [-1788, -1548], For the 3rd indexed RU [-1524, -1284], For the 4th indexed RU [-1276, -1036], For the 5th indexed RU [-1012, -772], For the 6th indexed RU [-764, -524], For the 7th indexed RU [-500, -260], For the 8th indexed RU [-252, -12], For the 9th indexed RU [12,252], For the 10th indexed RU [260,500], For the 11th indexed RU [524,764], For the 12th indexed RU [772,1012], For the 13th indexed RU [1036,1276], For the 14th indexed RU [1284,1524], [1548,1788] for the 15th indexed RU, and For the 16th indexed RU [1796,2036].

4. A method for wireless communication by a wireless communication device, comprising: modulating a long training field (LTF) sequence for a null data packet (NDP) onto a plurality of tones of a wireless channel comprising one or more 80 MHz bandwidth segments, the modulation excluding tones within a punctured subchannel of a plurality of subchannels of the 80 MHz bandwidth segments of the wireless channel, the modulation based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; transmitting, via the wireless channel, to a second wireless communication device, the NDP including the modulated LTF sequence, the NDP including a feedback request; as well as receiving channel state information (CSI) about the wireless channel in response to transmitting the NDP, wherein the CSI includes one feedback tone for every n grouped tones of the plurality of tones of the wireless channel, the CSI about one or more 996 tone resource units (RUs) being included in an indexed range of feedback tones within the 996 tone resource units (RUs) having n=4 or 16 feedback tone spacing, and further performing one of the following: (1) the wireless channel is an 80 MHz bandwidth channel, the feedback tone set for n=4 feedback tone intervals is defined as [-500:4:-4,4:4:500], which spans every 3 tone region of 1001 tones [-500 to +500] and has a DC tone region between [-4:4], (2) The wireless channel is a 160 MHz bandwidth channel, and the feedback tone set for n=4 feedback tone intervals is indicated by feedback start and end tone indexes for each 996 tone RU, and the feedback start and end tone indexes include: (i) providing indexed tones [-1012:4:-516, -508:4:-12] for feedback of the first 80 MHz sub-channel of the 160 MHz bandwidth channel, and (ii) providing an indexed tone [12:4:508,516:4:1012] for feedback of a second 80 MHz sub-channel of the 160 MHz bandwidth channel, (3) the wireless channel is a 320 MHz bandwidth channel, and a set of feedback tones for n=4 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) indexed tones [-2036:4:-1540, -1532:4:-1036] providing feedback for a first 80 MHz subchannel of the 320 MHz bandwidth channel, (ii) providing indexed tones [-1012:4:-516, -508:4:-12] for feedback of a second 80 MHz sub-channel of the 320 MHz bandwidth channel, (iii) providing an indexed tone [12:4:508,516:4:1012] for feedback of a third 80 MHz sub-channel of the 320 MHz bandwidth channel, and (iv) providing an indexed tone [1036:4:1532, 1540:4:2036] for feedback of a fourth 80 MHz sub-channel of the 320 MHz bandwidth channel, (4) the wireless channel is an 80 MHz bandwidth channel, the feedback tone set for n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning a region of every 15 tones of 1001 tones [-500:500] and having a DC tone region between [-4:4], (5) The wireless channel is a 160 MHz bandwidth channel, and the feedback tone set for n=16 feedback tone intervals is indicated by feedback start and end tone indexes for each 996 tone RU, and the feedback start and end tone indexes include: (i) providing indexed tones [-1012:16:-772, 764:16:-524, -516, -508, -500:16:-260, -252:16:-12] for feedback of a first 80 MHz sub-channel of the 160 MHz bandwidth channel, and (ii) providing indexed tones [12:16:252,260:16:500,508,516,524:16:764,772:16:1012] for feedback of a second 80 MHz sub-channel of the 160 MHz bandwidth channel, or (6) The wireless channel is a 320 MHz bandwidth channel, and the feedback tone set for n=16 feedback tone intervals is indicated by feedback start and end tone indexes for each 996 tone RU, and the feedback start and end tone indexes include: (i) providing indexed tones [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036] for feedback for a first 80 MHz sub-channel of the 320 MHz bandwidth channel, (ii) providing indexed tones [-1012:16:-772, -764:16:-524, -516, -508, -500:16:-260, -252:16:-12] for feedback of a second 80 MHz sub-channel of the 320 MHz bandwidth channel, (iii) providing indexed tones [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012] for feedback of a third 80 MHz sub-channel of the 320 MHz bandwidth channel, and (iv) Indexed tones [1036:16:1276, 1284:16:1524, 1532, 1540, 1548:16:1788, 1796:16:2036] providing feedback for a fourth 80 MHz sub-channel of the 320 MHz bandwidth channel.

5. A wireless communication device, comprising: at least one processor; as well as at least one memory communicatively coupled to the at least one processor and storing processor-readable code that, when executed by the at least one processor, is configured to: modulating a long training field (LTF) sequence for a null data packet (NDP) onto a plurality of tones of a wireless channel comprising one or more 80 MHz bandwidth segments, the modulation excluding tones within a punctured subchannel of a plurality of subchannels of the 80 MHz bandwidth segments of the wireless channel, the modulation based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence, wherein: (a) the symbol duration associated with the LTF sequence is 12.8 μs plus a guard interval, the LTF sequence is modulated onto each tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: (i) comprising the tones [-253:-12, 12:253, 259:500] based on the punctured subchannel being a first 20 MHz subchannel, (ii) comprising the tones [-500:-259, 12:253, 259:500] based on the punctured subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, (iii) comprising the tones [-500:-259, -253:-12, 259:500] based on the punctured subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, or (iv) comprising the tones [-500:-259, -253:-12, 12:253] based on the punctured subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel, (b) the symbol duration associated with the LTF sequence is 12.8 μs plus the guard interval, the LTF sequence is modulated onto each tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: (i) based on the punctured subchannel being the first 40 MHz subchannel, comprising the tones [12:253,259:500], or (ii) comprising tones [-500:-259, -253:-12] based on the punctured subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel, (c) the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, the LTF sequence is modulated onto every other tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 20 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: (i) comprising the tones [-252:2:-12, 12:2:252, 260:2:500] based on the punctured subchannel being a first 20 MHz subchannel, (ii) comprising the tones [-500:2:-260, 12:2:252, 260:2:500] based on the punctured subchannel being a second 20 MHz subchannel adjacent to the first 20 MHz subchannel, (iii) comprising the tones [-500:2:-260, -252:2:-12, 260:2:500] based on the punctured subchannel being a third 20 MHz subchannel adjacent to the second 20 MHz subchannel, or (iv) comprising the tones [-500:2:-260, -252:2:-12, 12:2:252] based on the punctured subchannel being a fourth 20 MHz subchannel adjacent to the third 20 MHz subchannel, or (d) the symbol duration associated with the LTF sequence is 6.4 μs plus the guard interval, the LTF sequence is modulated onto every other tone within a plurality of tone ranges of the OFDMA data tone plan, the punctured subchannel has a 40 MHz bandwidth within the 80 MHz bandwidth segment, the 80 MHz bandwidth segment includes 1001 tones, and the plurality of tone ranges: (i) comprising the tones [12:2:252, 260:2:500] based on the punctured subchannel being the first 40 MHz subchannel, or (ii) comprising tones [-500:2:-260, -252:2:-12] based on the punctured subchannel being a second 40 MHz subchannel adjacent to the first 40 MHz subchannel; and The NDP including the modulated LTF sequence is transmitted to a second wireless communication device via the wireless channel.

6. A method for wireless communication by a wireless communication device, comprising: receiving, from a first wireless device, a null data packet (NDP) on a wireless channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the wireless channel other than tones within a punctured subchannel of a plurality of subchannels of an 80 MHz bandwidth segment of the wireless channel, the modulation being based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; Generating channel state information (CSI) about the wireless channel in response to receiving the NDP with a feedback request for at least one segment of the bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth segment of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI including one feedback tone for every n grouped tones of the plurality of tones of the channel, wherein n=4 or 16, and the CSI about one or more 242 tone resource units (RUs) are included in an indexed range of feedback tones within 242 tone resource units (RUs) of n=4 or n=16 feedback tone intervals, and further performing one of the following: (1) For the wireless channel being an 80 MHz bandwidth channel, the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-500, -260], For the second indexed RU [-252, -12], [12,252] for the 3rd indexed RU, and For the 4th indexed RU [260,500], (2) When the wireless channel is a 160 MHz bandwidth channel, the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-1012, -772], For the second indexed RU [-764, -524], For the 3rd indexed RU [-500, -260], For the 4th indexed RU [-252, -12], For the 5th indexed RU [12,252], For the 6th indexed RU [260,500], [524,764] for the 7th indexed RU, and [772,1012] for the 8th indexed RU, or (3) For the wireless channel being a 320 MHz bandwidth channel, and the start / end tone index of the indexed range for the feedback tone comprises: For the first indexed RU [-2036, -1796], For the second indexed RU [-1788, -1548], For the 3rd indexed RU [-1524, -1284], For the 4th indexed RU [-1276, -1036], For the 5th indexed RU [-1012, -772], For the 6th indexed RU [-764, -524], For the 7th indexed RU [-500, -260], For the 8th indexed RU [-252, -12], For the 9th indexed RU [12,252], For the 10th indexed RU [260,500], For the 11th indexed RU [524,764], For the 12th indexed RU [772,1012], For the 13th indexed RU [1036,1276], For the 14th indexed RU [1284,1524], [1548,1788] for the 15th indexed RU, and [1796,2036] for the 16th indexed RU; and The CSI is transmitted to the first wireless device.

7. A method for wireless communication by a wireless communication device, comprising: receiving, from a first wireless device, a null data packet (NDP) on a wireless channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the wireless channel other than tones within a punctured subchannel of a plurality of subchannels of an 80 MHz bandwidth segment of the wireless channel, the modulation being based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; Generating channel state information (CSI) about the wireless channel in response to receiving the NDP with a feedback request for at least one segment of the bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth segment of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI comprising one feedback tone for every n grouped tones of the plurality of tones of the channel, wherein n=4 or 16, and the CSI about one or more 996 tone resource units (RUs) is included in an indexed range of feedback tones within the feedback 996 tone resource unit (RU), and wherein for each feedback 996 tone RU: (1) The feedback tone set for an 80 MHz bandwidth channel with n=4 feedback tone spacing is defined as [-500:4:-4,4:4:500], which spans every 3 tone region of 1001 tones [-500 to +500] with a DC tone region between [-4:4], (2) The feedback tone set for a 160 MHz bandwidth channel with n=4 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-1012:4:-516, -508:4:-12] for feedback of the first 80 MHz sub-channel of the 160 MHz bandwidth channel, and (ii) providing an indexed tone [12:4:508,516:4:1012] for feedback of a second 80 MHz sub-channel of the 160 MHz bandwidth channel, (3) The feedback tone set for a 320 MHz bandwidth channel with n=4 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-2036:4:-1540, -1532:4:-1036] for feedback of a first 80 MHz sub-channel of the 320 MHz bandwidth channel, (ii) providing indexed tones [-1012:4:-516, -508:4:-12] for feedback of a second 80 MHz sub-channel of the 320 MHz bandwidth channel, (iii) providing an indexed tone [12:4:508,516:4:1012] for feedback of a third 80 MHz sub-channel of the 320 MHz bandwidth channel, and (iv) providing an indexed tone [1036:4:1532, 1540:4:2036] for feedback of a fourth 80 MHz sub-channel of the 320 MHz bandwidth channel, (4) the set of feedback tones for the entire 80 MHz bandwidth channel for n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, comprising indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning every 15 tone region of 1001 tones [-500:500] with a DC tone region between [-4:4], (5) The feedback tone set for a 160 MHz bandwidth channel with n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-1012:16:-772, 764:16:-524, -516, -508, -500:16:-260, -252:16:-12] for feedback of a first 80 MHz sub-channel of the 160 MHz bandwidth channel, and (ii) providing indexed tones [12:16:252, 260:16:500, 508, 516, 524:16:764, 772:16:1012] for feedback of a second 80 MHz sub-channel of the 160 MHz bandwidth channel, (6) The feedback tone set for a 320 MHz bandwidth channel with n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036] for feedback for a first 80 MHz sub-channel of the 320 MHz bandwidth channel, (ii) providing indexed tones [-1012:16:-772, -764:16:-524, -516, -508, -500:16:-260, -252:16:-12] for feedback of a second 80 MHz sub-channel of the 320 MHz bandwidth channel, (iii) providing indexed tones [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012] for feedback of a third 80 MHz sub-channel of the 320 MHz bandwidth channel, and (iv) Indexed tones [1036:16:1276, 1284:16:1524, 1532, 1540, 1548:16:1788, 1796:16:2036] providing feedback for a fourth 80 MHz sub-channel of the 320 MHz bandwidth channel.

8. A wireless communication device, comprising: at least one processor; as well as at least one memory communicatively coupled to the at least one processor and storing processor-readable code that, when executed by the at least one processor, is configured to: receiving, from a first wireless device, a null data packet (NDP) on a wireless channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the wireless channel other than tones within a punctured subchannel of a plurality of subchannels of an 80 MHz bandwidth segment of the wireless channel, the modulation being based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; Generating channel state information (CSI) about the wireless channel in response to receiving the NDP with a feedback request for at least one segment of the bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth segment of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI including one feedback tone for every n grouped tones of the plurality of tones of the channel, wherein n=4 or 16, and the CSI about one or more 996 tone resource units (RUs) are included in an indexed range of feedback tones within a feedback 242 tone resource unit (RU), and for each feedback 242 tone RU, further performing one of the following: (1) For the wireless channel being an 80 MHz bandwidth channel, the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-500, -260], For the second indexed RU [-252, -12], [12,252] for the 3rd indexed RU, and For the 4th indexed RU [260,500], (2) For the wireless channel being an 80 MHz bandwidth segment in a 160 MHz bandwidth channel, the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-1012, -772], For the second indexed RU [-764, -524], For the 3rd indexed RU [-500, -260], For the 4th indexed RU [-252, -12], For the 5th indexed RU [12,252], For the 6th indexed RU [260,500], [524,764] for the 7th indexed RU, and [772,1012] for the 8th indexed RU, or (3) For the wireless channel being a 160 MHz bandwidth segment in a 320 MHz bandwidth channel, the start / end tone index of the indexed range for the feedback tone includes: For the first indexed RU [-2036, -1796], For the second indexed RU [-1788, -1548], For the 3rd indexed RU [-1524, -1284], For the 4th indexed RU [-1276, -1036], For the 5th indexed RU [-1012, -772], For the 6th indexed RU [-764, -524], For the 7th indexed RU [-500, -260], For the 8th indexed RU [-252, -12], For the 9th indexed RU [12,252], For the 10th indexed RU [260,500], For the 11th indexed RU [524,764], For the 12th indexed RU [772,1012], For the 13th indexed RU [1036,1276], For the 14th indexed RU [1284,1524], [1548,1788] for the 15th indexed RU, and [1796,2036] for the 16th indexed RU; and The CSI is transmitted to the first wireless device.

9. A method for wireless communication by a wireless communication device, comprising: modulating a long training field (LTF) sequence for a null data packet (NDP) onto a plurality of tones of a wireless channel comprising a plurality of 80 MHz bandwidth segments, the modulation excluding tones within punctured subchannels of a plurality of subchannels of the 80 MHz bandwidth segments of the wireless channel, the modulation based on a size and location of the punctured subchannels within the 80 MHz bandwidth segments, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; as well as transmitting the NDP including the LTF sequence to a second wireless communication device via the wireless channel, the NDP including a feedback request, the feedback request covering: (a) one or more sub-channels within the wireless channel, each having a bandwidth less than 80 MHz, (b) one or more sub-channels within the wireless channel, each having a bandwidth of 80 MHz, or (c) a combination of one or more bandwidth segments each less than 80 MHz and one or more bandwidth segments each of 80 MHz within a bandwidth channel; as well as receiving channel state information (CSI) about the wireless channel, the CSI comprising one feedback tone for every n grouped tones of the plurality of tones of the channel, where n=4 or 16, and wherein the CSI is included in an indexed range of feedback tones within one or more resource units (RUs), Wherein the relative indexed frequency tones at + / -4, + / -8 and + / -256 for n=4 in the 80 MHz bandwidth segment and the feedback frequency tone at + / -4 for n=16 are not sent for each of the one or more 80 MHz bandwidth segments when a bandwidth segment less than 80 MHz is requested in the feedback request, but are sent for each of the one or more 80 MHz bandwidth segments when the entire bandwidth segment of 80 MHz is requested in the feedback request.

10. A method for wireless communication by a wireless communication device, comprising: receiving, from a first wireless device, a null data packet (NDP) on a wireless channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the wireless channel other than tones within a punctured subchannel of a plurality of subchannels of an 80 MHz bandwidth segment of the wireless channel, the modulation being based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; Generating channel state information (CSI) about the channel in response to receiving the NDP having a feedback request for at least one segment of the bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth segment of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI comprising one feedback tone for every n warp-grouped tones of the plurality of tones of the channel, wherein n=4 or 16, and the CSI is included in a feedback 242 tone resource unit (RU) or a feedback 99 An indexed range of feedback tones within 6 frequency-tuned resource units (RUs), wherein the relative indexed tones at + / -4, + / -8 and + / -256 for n=4 in an 80 MHz bandwidth segment and the feedback tone at + / -4 for n=16 are not sent for each of the one or more bandwidth segments when a bandwidth segment less than 80 MHz is requested in the feedback request, but are sent for each of the one or more bandwidth segments when the entire bandwidth segment of 80 MHz is requested in the feedback request.

11. A wireless communication device, comprising: at least one processor; and at least one memory communicatively coupled to the at least one processor and storing processor-readable code, the processor-readable code being configured, when executed by the at least one processor, to: receiving, from a first wireless device, a null data packet (NDP) on a wireless channel having a bandwidth that is an integer multiple of 80 MHz, the NDP comprising a long training field (LTF) modulated onto a plurality of tones of the wireless channel other than tones within a punctured subchannel of a plurality of subchannels of an 80 MHz bandwidth segment of the wireless channel, the modulation being based on a size and location of the punctured subchannel within the 80 MHz bandwidth segment, an 80 MHz orthogonal frequency division multiple access (OFDMA) tone plan, and a symbol duration associated with transmitting the LTF sequence; Generating channel state information (CSI) about the wireless channel in response to receiving the NDP with a feedback request for at least one segment of the bandwidth, the feedback request covering at least a portion of an 80 MHz bandwidth channel or at least a portion of an 80 MHz bandwidth segment of a 160 MHz bandwidth channel or a 320 MHz bandwidth channel, the CSI comprising one feedback tone for every n grouped tones of the plurality of tones of the channel, wherein n=4 or 16, and the CSI is modulated in an indexed range of feedback tones within a feedback 996 tone resource unit (RU), and for each feedback 996 tone RU, further performing one of the following: (1) The feedback tone set for an 80 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone spacing is defined as [-500:4:-4,4:4:500], which spans every 3 tone region of 1001 tones [-500 to +500] with a DC tone region between [-4:4], (2) The feedback tone set for a 160 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-1012:4:-516, -508:4:-12] for feedback of the first 80 MHz sub-channel of the 160 MHz bandwidth channel, and (ii) providing an indexed tone [12:4:508,516:4:1012] for feedback of a second 80 MHz sub-channel of the 160 MHz bandwidth channel, (3) The feedback tone set for a 320 MHz bandwidth channel within a 996 tone RU with n=4 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-2036:4:-1540, -1532:4:-1036] for feedback of a first 80 MHz sub-channel of the 320 MHz bandwidth channel, (ii) providing indexed tones [-1012:4:-516, -508:4:-12] for feedback of a second 80 MHz sub-channel of the 320 MHz bandwidth channel, (iii) providing an indexed tone [12:4:508,516:4:1012] for feedback of a third 80 MHz sub-channel of the 320 MHz bandwidth channel, and (iv) providing indexed tones [1036:4:1532, 1540:4:2036] for feedback of a fourth 80 MHz subchannel of the 320 MHz bandwidth channel, (4) a set of feedback tones for the entire 80 MHz bandwidth channel for n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising indexed tones [-500:16:-260, -252:16:-12, -4, 4, 12:16:252, 260:16:500] spanning a region of every 15 tones of 1001 tones [-500:500] and having a DC tone region between [-4:4], (5) The feedback tone set for a 160 MHz bandwidth channel within a 996 tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-1012:16:-772, 764:16:-524, -516, -508, -500:16:-260, -252:16:-12] for feedback of a first 80 MHz sub-channel of the 160 MHz bandwidth channel, and (ii) providing indexed tones [12:16:252, 260:16:500, 508, 516, 524:16:764, 772:16:1012] for feedback of a second 80 MHz sub-channel of the 160 MHz bandwidth channel, (6) The feedback tone set for a 320 MHz bandwidth channel within a 996 tone RU with n=16 feedback tone intervals is indicated by feedback start and end tone indices for each 996 tone RU, the feedback start and end tone indices comprising: (i) providing indexed tones [-2036:16:-1796, -1788:16:-1548, -1540, -1532, -1524:16:-1284, -1276:16:1036] for feedback for a first 80 MHz sub-channel of the 320 MHz bandwidth channel, (ii) providing indexed tones [-1012:16:-772, -764:16:-524, -516, -508, -500:16:-260, -252:16:-12] for feedback of a second 80 MHz sub-channel of the 320 MHz bandwidth channel, (iii) providing indexed tones [12:16:252,260:Ng=16:500,508,516,524:16:764,772:16:1012] for feedback of a third 80 MHz sub-channel of the 320 MHz bandwidth channel, and (iv) Indexed tones [1036:16:1276, 1284:16:1524, 1532, 1540, 1548:16:1788, 1796:16:2036] providing feedback for a fourth 80 MHz sub-channel of the 320 MHz bandwidth channel.

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