Secure sounding signals

Patent metadata

Field	Value
Publication number	US-11044351-B2
Application number	US-201816216417-A
Country	US
Kind code	B2
Filing date	Dec 11, 2018
Priority date	Dec 11, 2017
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Methods, apparatuses, and computer readable media for location measurement reporting in a wireless network are disclosed. An apparatus of a responder station is disclosed, the apparatus comprising processing circuitry configured to derive bits from a temporary key, and generate a first sequence and a second sequence using the bits, wherein the first sequence and second sequence comprise one or more symbols. The processing circuitry is further configured to concatenate the first sequence and the second sequence to form a new first sequence comprising the first sequence and the second sequence, and concatenate a modified first sequence and a modified second sequence to form a new second sequence. The processing circuitry may be configured to repeat a number of times the concatenate the first sequence through the concatenate the modified first sequence.

First claim

What is claimed is:

1. An apparatus of a wireless device, the apparatus comprising: memory; processing circuitry coupled to the memory; and transceiver circuitry coupled to the processing circuitry, the processing circuitry configured to:
derive a number of bits, wherein the number of bits is based on a bandwidth of a null data packet (NDP) physical layer (PHY) protocol data unit (PPDU) to transmit;
generate two initial 8 phase shift keying (PSK) symbols s 1 (0) and s 2 (0) based on the number of bits;
generate a sequence of 2 p 8PSK symbols by performing P-1 iterations, wherein for p-th iteration two sequences s 1 (p) and s 2 (p) are generated by concatenating two sequences from the (p-1) iteration s 1 (p-1) and s 2 (p-1) wherein s 1 (p) is equal to s 1 (p-1) concatenated with s 2 (p-1) and wherein s 2 (p) is equal to a scaler times s 1 (p-1) concatenated with negative a value of the scaler times and s 2 (p-1) , wherein a value of P is based on the bandwidth of the NDP PPDU to transmit;
encode the NDP PPDU to comprise the 2 p 8PSK symbols as secure long training fields; and
configure the transceiver circuitry to transmit a signal comprising the NDP PPDU.

2. The apparatus of claim 1 , wherein the encode the NDP PPDU to comprise the 2 p 8PSK symbols as secure long training fields, further comprises:
map s 1 (p-1) and s 2 (p-1) on non-zero subcarriers comprising the secure long training fields of the NDP PPDU.

3. The apparatus of claim 2 , wherein the processing circuitry is further configured to:
apply a time-domain cyclic shift to each of the non-zero sub-carriers.

4. The apparatus of claim 3 , wherein the processing circuitry is further configured to:
determine the time-domain cyclic shift based on the number of bits.

5. The apparatus of claim 1 , wherein the processing circuitry is further configured to:
determine the value of the scaler based on a value of exponential of (j*π/4*a constant), wherein the constant is determined from the number of bits and j is the square root of −1.

6. The apparatus of claim 1 , wherein the bandwidth is 20, 40, 80, or 160/80+80 M1 Hz.

7. The apparatus of claim 1 , wherein the processing circuitry is further configured to:
encode a ranging element, the ranging element comprising an indication that secure LTFs are to be used; and
configure the wireless device to transmit the ranging element to a responder station (RSTA).

8. The apparatus of claim 1 , wherein the number of bits is based on a logarithm to the base 2 of the 2 p 8PSK symbols times a first constant plus a second constant.

9. The apparatus of claim 1 , wherein the processing circuitry is further configured to:
determine a time-domain cyclic shift based on the number of bits; and
apply a linear phase shift that is equivalent to the time-domain cyclic shift to a signal generated to modulate the symbols of the 2 p 8PSK symbols during the transmission of the NDP PPDU.

10. The apparatus of claim 1 , wherein the encode the NDP PPDU to comprise the 2 p 8PSK symbols as the secure long training fields, further comprises:
map s 1 (p-1) and s 2 (p-1) on the non-zero subcarriers comprising the secure long training fields of the NDP PPDU, wherein a number of the non-zero subcarriers is 512 for an 80 MHz bandwidth, 256 for a 40 MHz bandwidth, and 128 for a 20 MHz.

11. The apparatus of claim 1 , wherein the bandwidth comprises subcarriers, DC subcarriers, and edge subcarriers, and wherein each symbol of the 2 p 8PSK symbols is mapped to one subcarrier of the subcarriers.

12. The apparatus of claim 1 , wherein the derive the number of bits, further comprises:
determine the number of bits based on a shared master key and a temporary key.

13. The apparatus of claim 1 , wherein the wireless device is one from the following group: an Institute of Electrical and Electronic Engineers (IEEE) 802.11ax access point, an IEEE 802.11ax station, an IEEE 802.11 extremely high throughput (EHT) station, an IEEE 802.11EIT access point, IEEE 802.1laz responder station (RSTA), and an IEEE 802.11az initiator station (ISTA), an IEEE 802.11 station, and an IEEE 802.11 access point.

14. The apparatus of claim 1 , further comprising a direct conversion mixer, the direct conversion mixer configured to directly downconvert RF signals to baseband signals, wherein the processing circuitry is configured to decode the baseband signals, the baseband signals including another NDP PPDU.

15. The apparatus of claim 1 , wherein the transceiver circuitry coupled to two or more microstrip antennas for transmitting signalling in accordance with a multiple-input multiple-output (MIMO) technique.

16. A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors of an apparatus of a station, the instructions to configure the one or more processors to:
derive a number of bits, wherein the number of bits is based on a bandwidth of a null data packet (NDP) physical layer (PHY) protocol data unit (PPDU) to transmit;
generate two initial 8PSK symbols s 1 (0) and s 2 (0) based on the number of bits;
generate a sequence of 2p 8PSK symbols by performing P-1 iterations, wherein for a p-th iteration two sequences s 1 (p) and s 2 (p) are generated by concatenating two sequences from the (p-1) iteration s 1 (p-1) and s 2 (p-1) wherein s 1 (p) is equal to s 1 (p-1) concatenated with s 2 (p-1) , and wherein s 2 (p) is equal to a scaler times s 1 (p-1) concatenated with negative a value of the scaler times s 2 (p-1) , wherein a number of iterations is based on the bandwidth of the NDP PPDU to transmit;
encode the NDP PPDU to comprise the 2 p 8PSK symbols as long training fields; and
configure the wireless device to transmit a signal comprising the NDP PPDU.

17. The apparatus of claim 16 , wherein the encode the NDP PPDU to comprise the 2 p 8PSK symbols as long training fields, further comprises:
map s 1 (p-1) and s 2 (p-1) on non-zero subcarriers comprising the secure long training fields of the NDP PPDU.

18. An apparatus of a responder station (RSTA), the apparatus comprising: memory; and
processing circuitry coupled to the memory, the processing circuitry configured to:
decode an uplink (UL) null data packet (NDP) physical layer (PHY) protocol data unit (PPDU) within a bandwidth;
derive a number of bits, wherein the number of bits is based on the bandwidth;
generate two initial 8PSK symbols s 1 (0) and s 2 (0) based on the number of bits;
generate a sequence of 2 p 8PSK symbols by performing P-1 iterations, wherein for a p-th iteration two sequences s 1 (p) and s 2 (p) are generated by concatenating two sequences from the (p-1) iteration s 1 (p-1) and s 2 (p-1) , wherein s 1 (p) is equal to s 2 (p-1) concatenated with s 2 (p-1) , and wherein s 2 (p) is equal to a scaler times s 1 (p-1) concatenated with negative a value of the scaler times s 2 (p-1) , wherein a number of iterations is based on the bandwidth of the UL NDP PPDU;

determine whether the UL NDP PPDU matches the 2 p 8PSK symbols as long training fields;
in response a determination that the UL NDP PPDU matches the 2 p 8PSK symbols as long training fields, encode a location measurement report (LMR), the LMR indicating the UL NDP PPDU matches the 2 p 8PSK symbols as long training fields; and
configure the RSTA to transmit the LMR.

19. The apparatus of claim 18 , wherein the determine whether the UL NDP PPDU matches the 2 p 8PSK symbo

Assignees

• Intel Ip Corp

Inventors

• Li Qinghua
• Jiang Feng
• Gurevitz Assaf
• Stacey Robert J
• Niu Huaning
• Zhu Yuan
• Segev Jonathan

Classifications

• H04L69/18 Primary

  Multiprotocol handlers, e.g. single devices capable of handling multiple protocols · CPC title

• H04L27/2613 Primary

  Structure of the reference signals · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L2463/061

  applying further key derivation, e.g. deriving traffic keys from a pair-wise master key · CPC title

• H04L63/061

  for key exchange, e.g. in peer-to-peer networks (cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838) · CPC title