Methods to encode a binary phase shift keying (bpsk) mark for a wake-up radio (wur) packet

Patent metadata

Field	Value
Publication number	US-2020296669-A1
Application number	US-202016891558-A
Country	US
Kind code	A1
Filing date	Jun 3, 2020
Priority date	Apr 11, 2018
Publication date	Sep 17, 2020
Grant date	—

Abstract

Embodiments of an AP and wake up radio (WUR) non-AP station (STA) are generally described herein. The AP may transmit a WUR packet to wake up a wireless local area network (WLAN) radio of the WUR non-AP STA. A non-WUR portion of the WUR packet may include legacy fields and a BPSK mark to spoof high throughput (HT) devices receiving the WUR packet. The AP may transmit the BPSK mark in a channel that includes a lower guard band, a transmission bandwidth, and an upper guard band. The AP may encode the BPSK mark in accordance with: on-off keying (OOK) modulation in a center portion of the transmission bandwidth; and orthogonal frequency division multiplexing (OFDM) in a remaining portion of the transmission bandwidth that excludes the center portion.

First claim

1 . (canceled)

2 . An apparatus of a wake-up radio (WUR) access point (AP) (WUR AP), the apparatus comprising: processing circuitry; and memory, the processing circuitry configured to:
encode a WUR frequency division multiple access (FDMA) physical layer convergence procedure (PLCP) protocol data unit (PPDU) (WUR FDMA PPDU) for transmission on a 40 MHz channel bandwidth comprising two contiguous 20 MHz subchannels, the WUR FDMA PPDU comprising a WUR transmission on each of the contiguous 20 MHz subchannels, the WUR FDMA PPDU comprising a preamble and an FDMA WUR portion following the preamble, and the FDMA WUR portion comprising a WUR synchronization field (WUR-Sync) followed by a WUR data field (WUR-Data) encoded for transmission on each 20 MHz subchannel, wherein each WUR synchronization field indicates a data rate applied to the WUR data field which follows the WUR synchronization on an associated one of the 20 MHz subchannels, and the data rate comprises either a WUR low-data rate (WUR LDR) or a WUR high-data rate (WUR HDR), wherein the preamble comprises a legacy signal field (L-SIG) indicating a length of the WUR FDMA PPDU, wherein the WUR synchronization field and the WUR data field comprise multicarrier on-off keying (MC-OOK) waveforms, wherein the processing circuitry is configured to modulate data for the WUR data field using MC-OOK modulation in accordance with either the WUR LDR or the WUR HDR, and wherein the processing circuitry is further configured to determine if padding is needed for any of the 20 MHz channels of the WUR FDMA PPDU based on whether a duration of the WUR transmission on any of the 20 MHZ subchannels is shorter than the length indicated by the L-SIG, wherein if padding is needed on any of the 20 MHz subchannels, the processing circuitry is configured to generate a padding waveform by repeating the MC-OOK waveform corresponding to an information bit having a value of one modulated in accordance with the WUR HDR, the padding waveform to be transmitted after the WUR data field on each of the 20 MHz subchannels determined to need padding.

3 . The apparatus of claim 2 , wherein the WUR synchronization field comprises a predetermined sequence modulated in accordance with the MC-OOK waveform, and
wherein the WUR data field comprises encoded bits modulated in accordance with the MC-OOC waveform.

4 . The apparatus of claim 2 , wherein the processing circuitry is configured to encode information bits to generate encoded bits, the encoded bits to be represented by on and off symbols of the MC-OOK waveform,
wherein the WUR-Data field for the WUR LDR, each symbol is configured to have a 4-microsecond duration, and wherein the WUR Data field for the WUR HDR, each symbol is configured to have a 2-microsecond duration.

5 . The apparatus of claim 4 , wherein for the WUR LDR, the WUR data field is configured to be transmitted at a data rate of 62.5 kb/s, and
wherein for the WUR HDR, the WUR data field is configured to be transmitted at a data rate of 250 kb/s.

6 . The apparatus of claim 2 wherein if padding is determined to be needed on a 20 MHz subchannel in which the WUR data field is to be transmitted in accordance with the WUR LDR, the processing circuitry is configured to generate the padding waveform by repeating the MC-OOC waveform of a WUR HDR information bit having a value of one.

7 . The apparatus of claim 6 wherein if padding is determined to be needed on a 20 MHz subchannel in which the WUR data field is to be transmitted in accordance with the WUR HDR, the processing circuitry is configured to generate the padding waveform by repeating the MC-OOC waveform of a WUR HDR information bit having a value of one.

8 . The apparatus of claim 7 , wherein the information bit of value 1 corresponds to an encoded bit pair of [0,1].

9 . The apparatus of claim 2 , wherein the padding waveform is to be transmitted after the WUR data field on each of the 20 MHz subchannels determined to need padding to lengthen the WUR transmission up to the length indicated by the L-SIG.

10 . The apparatus of claim 2 wherein the preamble of the WUR FDMA PPDU comprises a preamble portion that is duplicated for concurrent transmission on each 20 MHz channel, wherein the preambles comprise orthogonal frequency division multiplexed (OFDM) signals.

11 . The apparatus of claim 2 , wherein the preamble comprises a binary phase-shift keying (BPSK) mark field (BPSK-Mark) following the L-SIG, the BPSK mark field to spoof high throughput (HT) stations (STAs) from false PPDU format detection.

12 . The apparatus of claim 2 , wherein the WUR FDMA PPDU is configured to wake-up a WUR non-AP station.

13 . A non-transitory computer-readable storage medium that stores instructions for execution by processing circuitry of a wake-up radio (WUR) access point (AP) (WUR AP), the processing circuitry configured to:
encode a WUR frequency division multiple access (FDMA) physical layer convergence procedure (PLCP) protocol data unit (PPDU) (WUR FDMA PPDU) for transmission on a 40 MHz channel bandwidth comprising two contiguous 20 MHz subchannels, the WUR FDMA PPDU comprising a WUR transmission on each of the contiguous 20 MHz subchannels, the WUR FDMA PPDU comprising a preamble and an FDMA WUR portion following the preamble, and the FDMA WUR portion comprising a WUR synchronization field (WUR-Sync) followed by a WUR data field (WUR-Data) encoded for transmission on each 20 MHz subchannel, wherein each WUR synchronization field indicates a data rate applied to the WUR data field which follows the WUR synchronization on an associated one of the 20 MHz subchannels, and the data rate comprises either a WUR low-data rate (WUR LDR) or a WUR high-data rate (WUR HDR), wherein the preamble comprises a legacy signal field (L-SIG) indicating a length of the WUR FDMA PPDU, wherein the WUR synchronization field and the WUR data field comprise multicarrier on-off keying (MC-OOK) waveforms, wherein the processing circuitry is configured to modulate data for the WUR data field using MC-OOK modulation in accordance with either the WUR LDR or the WUR HDR, and wherein the processing circuitry is further configured to determine if padding is needed for any of the 20 MHz channels of the WUR FDMA PPDU based on whether a duration of the WUR transmission on any of the 20 MHZ subchannels is shorter than the length indicated by the L-SIG, wherein if padding is needed on any of the 20 MHz subchannels, the processing circuitry is configured to generate a padding waveform by repeating the MC-OOK waveform corresponding to an information bit having a value of one modulated in accordance with the WUR HDR, the padding waveform to be transmitted after the WUR data field on each of the 20 MHz subchannels determined to need padding.

14 . The non-transitory computer-readable storage medium of claim 13 , wherein the WUR synchronization field comprises a predetermined sequence modulated in accordance with the MC-OOK waveform, and
wherein the WUR data field comprises encoded bits modulated in accordance with the MC-OOC waveform.

15 . The non-transitory computer-readable storage medium of claim 13 , wherein the processing circuitry is configured to encode information bits to generate encoded bits, the encoded bits to be represented by on and off symbols of the MC-OOK waveform, wherein the WUR-Data field for the WUR LDR, each symbol is configured to have a 4-microsecond duration, and
wherein the WUR Data field for the WUR HDR, each symbol is configured to have a 2-microsecond duration.

16 . The non-transitory computer-readable storage medi

Assignees

• Intel Corp

Inventors

• Azizi Shahrnaz
• Kenney Thomas J
• Min Alexander W
• Huang Po-Kai
• Kristem Vinod
• Park Minyoung
• Cariou Laurent
• Chen Xiaogang

Classifications

• H04L27/2603

  Signal structure ensuring backward compatibility with legacy system · CPC title

• H04L27/26132

  using repetition · CPC title

• H04L27/2613

  Structure of the reference signals · CPC title

• H04L27/2602

  Signal structure · CPC title

• H04W52/0229 Primary

  where the received signal is a wanted signal · CPC title