Signature sequence for system identification in a shared spectrum

• US 10,728,765 B2
• Filed: 12/18/2018
• Issued: 07/28/2020
• Est. Priority Date: 09/29/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Sun, Jing, Yoo, Taesang, Zhang, Xiaoxia, Barghi, Sanaz, Montojo, Juan
• Primary Examiner(s): Tran, Mong-Thuy T
• Application Number:
  US16/224,540
• Publication Number:
  US 20190132745A1
• Time in Patent Office: 588 Days
• Field of Search: 455454
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

Aspects of the disclosure relate to wireless communication systems configured to share a shared spectrum with one or more other systems (e.g., other operator networks utilizing the same radio access technology, and/or other networks utilizing different radio access technologies). Coexistence between the different systems on the shared spectrum may be provided by utilizing a technology-neutral signature waveform such as a signature sequence. A device or system may monitor a shared spectrum channel for the signature waveform, and when detected, may determine whether the shared spectrum is available for that system, or busy as occupied by another system. When the shared spectrum channel is idle, the device or system may reserve the channel by transmitting the signature waveform. Other aspects, embodiments, and features are also claimed and described.

Claims

1. A method of wireless communication operable at a wireless communication device, comprising:

transmitting a technology-neutral signature waveform having a sample rate R, a number of samples N, and a repetition factor K to reserve a spectrum channel shared by two or more different systems, the technology-neutral signature waveform being detectable by devices of the two or more different systems based on the sample rate R, the number of samples N, and the repetition factor K, the technology-neutral signature waveform comprising burst duration information that indicates a duration of a first technology-specific waveform corresponding to a first system that the wireless communication device is configured to use;

repeating the transmission of the technology-neutral signature waveform over K repetitions, wherein N and K are positive integers, respectively; and

transmitting, following the technology-neutral signature waveform, the first technology-specific waveform to communicate with one or more devices of the first system.

2. The method of claim 1, further comprising:

transmitting a follow-up waveform after the transmitted technology-neutral signature waveform, wherein the follow-up waveform carries payload information corresponding to the first technology-specific waveform.

3. The method of claim 1, wherein the transmitted technology-neutral signature waveform has a constant envelope and a peak-to-average power ratio (PAPR) below a PAPR threshold.

4. The method of claim 1, wherein the transmitting the technology-neutral signature waveform comprises modulating the transmitted technology-neutral signature waveform utilizing binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK).

5. The method of claim 1, further comprising:

monitoring the shared spectrum channel to detect a transmission of the technology-neutral signature waveform by another device, the monitoring comprising;

sensing a signal on the shared spectrum channel;

determining an autocorrelation of the sensed signal; and

if the autocorrelation is greater than an autocorrelation threshold, determining that the shared spectrum channel carries the technology-neutral signature waveform;

if the technology-neutral signature waveform is detected from a first system the wireless communication device is configured to use, monitoring the shared spectrum channel for the first technology-specific waveform corresponding to the first system;

if the technology-neutral signature waveform is detected from a second system known to the wireless communication device, forgoing to use the shared spectrum channel for a back off time, or monitoring the shared spectrum channel for a second technology-specific waveform corresponding to the second system; and

if the technology-neutral signature waveform is detected from a third system with an unknown signature waveform, forgoing to use the shared spectrum channel for the back off time.

6. The method of claim 5, further comprising:

if the technology-neutral signature waveform is not detected for a time greater than a threshold amount of time, determining that the shared spectrum channel is idle.

7. A wireless communication device comprising:

a processor;

a memory communicatively coupled to the processor; and

a transceiver communicatively coupled to the processor,

wherein the processor and the memory are configured to;

transmit using the transceiver a technology-neutral signature waveform having a sample rate R, a number of samples N, and a repetition factor K to reserve a spectrum channel shared by two or more different systems, the technology-neutral signature waveform being detectable using autocorrelation by devices of the two or more different systems based on the sample rate R, the number of samples N, and the repetition factor K, the technology-neutral signature waveform comprising burst duration information that indicates a duration of a first technology-specific waveform corresponding to a first system that the wireless communication device is configured to use;

repeat the transmission of the technology-neutral signature waveform over K repetitions, wherein N and K are positive integers, respectively; and

transmit using the transceiver, following the technology-neutral signature waveform, the first technology-specific waveform to communicate with one or more devices of the first system.

8. The wireless communication device of claim 7, wherein the processor and the memory are further configured to:

transmit a follow-up waveform after the transmitted technology-neutral signature waveform, wherein the follow-up waveform carries payload information corresponding to the first technology-specific waveform.

9. The wireless communication device of claim 7, wherein the transmitted technology-neutral signature waveform has a constant envelope and a peak-to-average power ratio (PAPR) below a PAPR threshold.

10. The wireless communication device of claim 7, wherein the processor and the memory are further configured to modulate the transmitted technology-neutral signature waveform utilizing binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK).

11. The wireless communication device of claim 8, wherein the processor and the memory are further configured to:

monitor the shared spectrum channel to detect a transmission of the technology-neutral signature waveform by another device, the monitoring comprising;

sensing a signal on the shared spectrum channel;

determining an autocorrelation of the sensed signal; and

if the autocorrelation is greater than an autocorrelation threshold, determining that the shared spectrum channel carries the technology-neutral signature waveform;

if the technology-neutral signature waveform is detected from a first system the wireless communication device is configured to use, monitor the shared spectrum channel for the first technology-specific waveform corresponding to the first system;

if the technology-neutral signature waveform is detected from a second system known to the wireless communication device, forgoing to use the shared spectrum channel for a back off time, or monitor the shared spectrum channel for a second technology-specific waveform corresponding to the second system; and

if the technology-neutral signature waveform is detected from a third system with an unknown signature waveform, forgoing to use the shared spectrum channel for the back off time.

12. The wireless communication device of claim 11, wherein the processor and the memory are further configured to:

if the technology-neutral signature waveform is not detected for a time greater than a threshold amount of time, determine that the shared spectrum channel is idle.

13. A non-transitory computer readable medium storing computer executable code comprising instructions operable at a wireless communication device for:

transmitting a technology-neutral signature waveform having a sample rate R, a number of samples N, and a repetition factor K to reserve a spectrum channel shared by two or more different systems, the technology-neutral signature waveform being detectable by the devices of the two or more different systems based on the sample rate R, the number of samples N, and the repetition factor K, the technology-neutral signature waveform comprising burst duration information that indicates a duration of a first technology-specific waveform corresponding to a first system that the wireless communication device is configured to use;

repeating the transmission of the technology-neutral signature waveform over K repetitions, wherein N and K are positive integers, respectively; and

transmitting, following the technology-neutral signature waveform, the first technology-specific waveform to communicate with one or more devices of the first system.

14. The non-transitory computer readable medium of claim 13, further comprising instructions for:

transmitting a follow-up waveform after the transmitted technology-neutral signature waveform, wherein the follow-up waveform carries payload information corresponding to the first technology-specific waveform.

15. The non-transitory computer readable medium of claim 13, wherein the transmitted technology-neutral signature waveform has a constant envelope and a peak-to-average power ratio (PAPR) below a PAPR threshold.

16. The non-transitory computer readable medium of claim 13, further comprising instructions for modulating the transmitted technology-neutral signature waveform utilizing binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK).

17. The non-transitory computer readable medium of claim 13, further comprising instructions for:

monitoring the shared spectrum channel to detect a transmission of the technology-neutral signature waveform by another device, the monitoring comprising;

sensing a signal on the shared spectrum channel;

determining an autocorrelation of the sensed signal; and

if the autocorrelation is greater than an autocorrelation threshold, determining that the shared spectrum channel carries the technology-neutral signature waveform;

if the technology-neutral signature waveform is detected from a first system the wireless communication device is configured to use, monitoring the shared spectrum channel for the first technology-specific waveform corresponding to the first system;

if the technology-neutral signature waveform is detected from a second system known to the wireless communication device, forgoing to use the shared spectrum channel for a back off time, or monitoring the shared spectrum channel for a second technology-specific waveform corresponding to the second system; and

if the technology-neutral signature waveform is detected from a third system with an unknown signature waveform, forgoing to use the shared spectrum channel for the back off time.

18. The non-transitory computer readable medium of claim 17, further comprising instructions for:

if the technology-neutral signature waveform is not detected for a time greater than a threshold amount of time, determining that the shared spectrum channel is idle.

19. A wireless communication device comprising:

means for transmitting a technology-neutral signature waveform having a sample rate R, a number of samples N, and a repetition factor K to reserve a spectrum channel shared by two or more different systems, the technology-neutral signature waveform being detectable by devices of the two or more different systems based on the sample rate R, the number of samples N, and the repetition factor K, the technology-neutral signature waveform comprising burst duration information that indicates a duration of a first technology-specific waveform corresponding to a first system that the wireless communication device is configured to use;

means for repeating the transmission of the technology-neutral signature waveform over K repetitions, wherein N and K are positive integers, respectively; and

means for transmitting, following the technology-neutral signature waveform, the first technology-specific waveform to communicate with one or more devices of the first system.

20. The wireless communication device of claim 19, further comprising:

means for transmitting a follow-up waveform after the transmitted technology-neutral signature waveform, wherein the follow-up waveform carries payload information corresponding to the first technology-specific waveform.

21. The wireless communication device of claim 19, wherein the transmitted technology-neutral signature waveform has a constant envelope and a peak-to-average power ratio (PAPR) below a PAPR threshold.

22. The wireless communication device of claim 19, wherein the means for transmitting the technology-neutral signature waveform is configured to modulate the transmitted technology-neutral signature waveform utilizing binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK).

23. The wireless communication device of claim 19, further comprising:

means for monitoring the shared spectrum channel to detect a transmission of the technology-neutral signature waveform by another device, the monitoring comprising;

sensing a signal on the shared spectrum channel;

determining an autocorrelation of the sensed signal; and

if the autocorrelation is greater than an autocorrelation threshold, determining that the shared spectrum channel carries the technology-neutral signature waveform;

means for, if the technology-neutral signature waveform is detected from a first system the wireless communication device is configured to use, monitoring the shared spectrum channel for the first technology-specific waveform corresponding to the first system;

means for, if the technology-neutral signature waveform is detected from a second system known to the wireless communication device, forgoing to use the shared spectrum channel for a back off time, or monitoring the shared spectrum channel for a second technology-specific waveform corresponding to the second system; and

means for, if the technology-neutral signature waveform is detected from a third system with an unknown signature waveform, forgoing to use the shared spectrum channel for the back off time.

24. The wireless communication device of claim 23, further comprising:

means for, if the technology-neutral signature waveform is not detected for a time greater than a threshold amount of time, determining that the shared spectrum channel is idle.