بعض محتويات هذا التطبيق غير متوفرة في الوقت الحالي.
إذا استمرت هذه الحالة ، يرجى الاتصال بنا علىتعليق وإتصال
1. (WO2019027831) PROTECTION OF RANGING SOUNDING FROM PREFIX REPLAY ATTACKS
ملاحظة: نص مبني على عمليات التَعرف الضوئي على الحروف. الرجاء إستخدام صيغ PDF لقيمتها القانونية

CLAIMS

What is claimed is:

1. A method for wireless communication, comprising:

identifying a ranging measurement signal comprising a cyclic prefix for transmission to a wireless device;

generating a modified ranging measurement signal comprising a modified cyclic prefix for transmission in a ranging measurement frame, wherein the modified cyclic prefix is not a repeated portion of the modified ranging measurement signal; and

transmitting the modified ranging measurement signal in the ranging measurement frame.

2. The method of claim 1, wherein the cyclic prefix comprises a repeated portion of the ranging measurement signal, and wherein the modified cyclic prefix comprises a gap interval, a zeroed-out cyclic prefix, a set of zero- value-modulated symbols, no transmission, or an unmodulated carrier.

3. The method of claim 1, wherein generating the modified ranging measurement signal comprises determining a pseudo random sequence to modulate the cyclic prefix, wherein the modified cyclic prefix consists of a sequence of symbols modulated with the pseudo random sequence.

4. The method of claim 1, further comprising identifying a restricted modulation and coding scheme (MCS) for the ranging measurement frame, wherein the ranging measurement frame is transmitted according to the restricted MCS.

5. The method of claim 4, wherein identifying the restricted MCS comprises negotiating a value for the restricted MCS based at least in part on a ranging operation.

6. The method of claim 1, wherein generating the modified ranging measurement signal comprises determining a modified set of modulated symbols for the modified cyclic prefix that is different than a set of modulated symbols of the cyclic prefix.

7. The method of claim 1, further comprising encrypting a channel estimation training sequence of the ranging measurement frame, wherein the transmitted ranging measurement frame includes the encrypted channel estimation training sequence.

8. The method of claim 7, further comprising performing a medium reservation operation based at least in part on transmission of the encrypted channel estimation training sequence, wherein the medium reservation operation comprises a medium access control (MAC) layer signaling technique.

9. The method of claim 7, further comprising:

transmitting a request-to-send (RTS) message comprising network allocation vector (NAV) timing information; and

receiving, in response to the RTS message, a clear-to-send (CTS) message, wherein transmitting the ranging measurement frame is based at least in part on the CTS message.

10. The method of claim 7, further comprising transmitting, before transmission of the ranging measurement frame, an encryption key corresponding to the encrypted channel estimation training sequence.

11. The method of claim 7, further comprising:

receiving, from the wireless device, a second ranging measurement frame that comprises encryption information for a ranging measurement acknowledgement (ACK) frame; and

encrypting a channel estimation field of the ranging measurement ACK frame based at least in part on the encryption information.

12. The method of claim 1, further comprising encoding a channel estimation field of the ranging measurement frame, wherein the transmitted ranging measurement frame includes the encoded channel estimation field.

13. The method of claim 12, further comprising:

establishing a ranging negotiation session with the wireless device; and

14. The method of claim 13, further comprising transmitting, during the ranging negotiation, an indication of the encryption key to the wireless device.

15. The method of claim 13, wherein the encryption key is determined based at least in part on a master key and a previously received measurement or measurement feedback frame.

16. The method of claim 12, further comprising conveying channel estimation field encoding information in a field subsequent to the channel estimation field of the ranging measurement frame.

17. The method of claim 12, further comprising conveying channel estimation field encoding information in a frame subsequent to transmission of the ranging measurement frame.

18. A method for wireless communication, comprising:

receiving, from a wireless device, a ranging measurement signal in a ranging measurement frame including a cyclic prefix, wherein the cyclic prefix is a zeroed-out cyclic prefix or a sequence of symbols modulated with a pseudo random sequence;

determining a channel estimation technique that accounts for the zeroed-out cyclic prefix or the sequence of sample symbols modulated with the pseudo random sequence; and estimating a channel from the ranging measurement frame based at least in part on the channel estimation technique.

19. The method of claim 18, wherein the zeroed-out cyclic prefix comprises a set of zero-value-modulated sample symbols, no transmission, or an unmodulated carrier, or any combination thereof.

20. The method of claim 18, wherein estimating the channel comprises modeling the channel as a finite impulse response (FIR) filter and determining a system of equations based at least in part on the FIR filter.

21. The method of claim 20, wherein estimating the channel further comprises performing a least squares operation using the system of equations.

22. The method of claim 18, further comprising receiving a channel estimation training sequence from the ranging measurement frame, wherein the channel estimation training sequence is encrypted using an encryption key.

23. The method of claim 22, further comprising:

establishing a ranging negotiation session with the wireless device;

determining, during the ranging negotiation session, the encryption key for the ranging measurement frame; and

decrypting the channel estimation training sequence based at least in part on the encryption key.

24. The method of claim 18, further comprising:

identifying an encoded channel estimation field of the ranging measurement frame; receiving channel estimation encoding information in a field subsequent to the channel estimation field; and

decoding the channel estimation field based at least in part on the channel estimation encoding information.

25. An apparatus for wireless communication, comprising:

means for identifying a ranging measurement signal comprising a cyclic prefix for transmission to a wireless device;

means for generating a modified ranging measurement signal comprising a modified cyclic prefix for transmission in a ranging measurement frame, wherein the modified cyclic prefix is not a repeated portion of the modified ranging measurement signal; and

means for transmitting the ranging measurement signal in the ranging measurement frame.

26. The apparatus of claim 25, wherein the cyclic prefix comprises a repeated portion of the ranging measurement signal, and wherein the modified cyclic prefix comprises a gap interval, a zeroed-out cyclic prefix, a set of zero-value-modulated symbols, no transmission, or an unmodulated carrier.

27. The apparatus of claim 25, further comprising:

means for determining a pseudo random sequence to modulate the cyclic prefix, wherein the modified cyclic prefix consists of a sequence of symbols modulated with the pseudo random sequence.

28. An apparatus for wireless communication, comprising:

means for receiving, from a wireless device, a ranging measurement signal in a ranging measurement frame including a cyclic prefix, wherein the cyclic prefix is a zeroed-out cyclic prefix or a sequence of symbols modulated with a pseudo random sequence;

means for determining a channel estimation technique that accounts for the zeroed-out cyclic prefix or the sequence of sample symbols modulated with the pseudo random sequence; and

means for estimating a channel from the ranging measurement frame based at least in part on the channel estimation technique.

29. The apparatus of claim 28, wherein the zeroed-out cyclic prefix comprises a gap interval, a set of zero-value-modulated symbols, no transmission, or an unmodulated carrier, or any combination thereof.

30. The apparatus of claim 28, further comprising:

means for modeling the channel as a finite impulse response (FIR) filter; and means for determining a system of equations based at least in part on the FIR filter.