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

Patent metadata

Field	Value
Publication number	US-10779236-B2
Application number	US-201916381548-A
Country	US
Kind code	B2
Filing date	Apr 11, 2019
Priority date	Apr 11, 2018
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

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

What is claimed is:

1. An apparatus of an access point (AP), the apparatus comprising: memory; and processing circuitry, configured to:
encode, for transmission to a wake-up receiver (WURx) of a wake-up radio non-access point (AP) station (WUR non-AP STA), a wake-up radio (WUR) packet to wake up a wireless local area network (WLAN) radio of the WUR non-AP STA,
wherein the processing circuitry is configured to encode a non-WUR portion of the WUR packet to include a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal field (L-SIG), and a binary phase-shift keying (BPSK) mark, the BPSK mark to spoof high throughput (HT) devices receiving the WUR packet,
wherein the processing circuitry is configured to encode the BPSK mark for transmission in a channel that includes a lower guard band, a transmission bandwidth, and an upper guard band,
wherein the processing circuitry is configured to 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, wherein the remaining portion of the transmission bandwidth is divided into data subcarriers, wherein BPSK symbols are mapped to the data subcarriers,

wherein the memory is configured to store information related to the WUR packet.

2. The apparatus according to claim 1 , the processing circuitry further configured to:
encode the non-WUR portion of the WUR packet to include the BPSK mark to spoof the HT devices to detect the WUR packet as a non-HT packet.

3. The apparatus according to claim 1 , the processing circuitry further configured to:
encode the non-WUR portion of the WUR packet to include the BPSK mark to spoof the HT devices from detection of a first symbol of the WUR preamble as rotated BPSK.

4. The apparatus according to claim 1 , the processing circuitry further configured to:
encode a WUR preamble and a WUR payload for inclusion in a WUR portion of the WUR packet, the WUR preamble and the WUR payload encoded in accordance with OOK modulation,
wherein the WUR preamble is to be detected by the WURx after the WUR non-AP STA transitions from a WURx doze state to a WURx awake state,
wherein the WUR preamble indicates, to the WURx, to decode the WUR payload while the WUR non-AP STA is in the WURx awake state.

5. The apparatus according to claim 1 , wherein:
the remaining portion of the transmission bandwidth that excludes the center portion further includes:
a first WUR guard band immediately below the center portion in frequency, and
a second WUR guard band immediately above the center portion in frequency, and

the processing circuitry is further configured to refrain from mapping symbols to the first and second WUR guard bands in the BPSK mark.

6. The apparatus according to claim 1 , wherein:
the channel is of bandwidth of 20 MHz,
the data subcarriers are spaced by 312.5 kHz,
the BPSK mark is of duration equal to 4 usec,
the transmission bandwidth includes 53 data subcarriers, and
the center portion of the transmission bandwidth spans 13 data subcarriers.

7. The apparatus according to claim 6 , the processing circuitry further configured to:
encode the BPSK mark based on a predetermined OOK pattern.

8. The apparatus according to claim 1 , the processing circuitry further configured to:
encode the L-SIG based on a pattern of symbols mapped to 53 subcarriers that corresponds to the transmission bandwidth of the BPSK mark, and further based on another 4 bits mapped to 4 extra subcarriers in the lower guard band and/or upper guard band; and
encode the BPSK mark based on a plurality of encoded bits mapped to the 4 extra subcarriers.

9. The apparatus according to claim 1 , the processing circuitry further configured to:
encode the BPSK mark in accordance with OOK modulation in the center portion of the transmission bandwidth to extend a WUR synchronization portion of the WUR preamble.

10. The apparatus according to claim 1 , the processing circuitry further configured to:
encode the BPSK mark in accordance with OOK modulation in the center portion of the transmission bandwidth to enable automatic gain control (AGC) settling, detection of the WUR payload, or in WUR synchronization.

11. The apparatus according to claim 1 , the processing circuitry further configured to:
encode the WUR packet to wake up the WLAN radio of the WUR non-AP STA for reception of a data packet from the AP; and
encode the data packet for transmission to the WUR non-AP STA.

12. The apparatus according to claim 1 , wherein:
the processing circuitry includes a baseband processor to encode the WUR packet, and
the apparatus includes a transceiver to transmit the WUR packet.

13. A non-transitory computer-readable storage medium that stores operations for execution by processing circuitry to perform operations for communication by an access point (AP), the operations to configure the processing circuitry to:
encode, for transmission to a wake-up receiver (WURx) of a wake-up radio non-access point (AP) station (WUR non-AP STA), a wake-up radio (WUR) packet to wake up a wireless local area network (WLAN) radio of the WUR non-AP STA,
wherein the operations configure the processing circuitry to encode a non-WUR portion of the WUR packet to include a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal field (L-SIG), and a binary phase-shift keying (BPSK) mark, the BPSK mark to spoof high throughput (HT) devices receiving the WUR packet,
wherein the operations further configure the processing circuitry to encode the L-SIG for orthogonal frequency division multiplexing (OFDM) transmission in a channel that includes a lower guard band, a transmission bandwidth, and an upper guard band,
wherein the operations further configure the processing circuitry to encode the BPSK mark for OFDM transmission in at least a portion of the transmission bandwidth,
wherein the operations further configure the processing circuitry to extend the L-SIG by mapping one or more predetermined symbols to one or more extra subcarriers within the lower guard band and/or upper guard band,
wherein the operations further configure the processing circuitry to extend the BPSK mark by mapping one or more encoded symbols to the extra subcarriers.

14. The non-transitory computer-readable storage medium according to claim 13 , the operations to further configure the processing circuitry to:
encode the L-SIG based on:
a pattern of symbols mapped to 53 subcarriers of the transmission bandwidth, and
another 4 bits mapped to 4 extra subcarriers in the lower guard band and/or upper guard band; and

encode the BPSK mark based on:
encoded bits mapped to at least a portion of the 53 subcarriers of the transmission bandwidth, and
encoded bits mapped to the 4 extra subcarriers.

15. The non-transitory computer-readable storage medium according to claim 14 , the operations to further configure the processing circuitry to:
generate the encoded bits that are mapped at least a portion of the 53 subcarriers of the transmission bandwidth based on signaling bits intended for the WURx.

16. The non-transitory computer-readable storage medium according to claim 13 , the operations to further configure the processing circuitry to:
encode the WUR packet to include a WUR preamble immediately after the BPSK mark; and
encode the BPSK mark in accordance with OOK modulation in the center portion of the transmissi

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