Method and apparatus for transmitting Wi-Fi signals in unlicensed spectrum in wireless communication system

Patent metadata

Field	Value
Publication number	US-10284408-B2
Application number	US-201515324256-A
Country	US
Kind code	B2
Filing date	Jul 13, 2015
Priority date	Jul 11, 2014
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A method and apparatus for transmitting a Wi-Fi signal in a wireless communication system is provided. A device supporting long-term evolution in unlicensed spectrum (LTE-U) transmits a LTE signal, and transmits the Wi-Fi signal. The Wi-Fi signal may be transmitted by various methods, i.e. by being emulated in the LTE signal, by using a Wi-Fi processor which is embedded in a LTE processor, or by using a Wi-Fi processor which is individual to a LTE processor.

First claim

What is claimed is:

1. A method for a device supporting long-term evolution (LTE) in an unlicensed spectrum in a wireless communication system, the method performed by a device and comprising:
generating an LTE signal using a digital-to-analog converter (DAC);
generating a Wi-Fi signal emulated in the generated LTE signal using the same DAC;
transmitting the generated LTE signal; and
transmitting the generated Wi-Fi signal,
wherein the generated LTE signal and the generated Wi-Fi signal are over-sampled to align a sampling rate of the generated LTE signal and the generated Wi-Fi signal.

2. The method of claim 1 , wherein the generated Wi-Fi signal is a clear-to-send to self based channel reservation.

3. The method of claim 1 , further comprising:
precoding the generated Wi-Fi signal by binary phase shift keying; and
mapping the precoded Wi-Fi signal to resource elements.

4. The method of claim 1 , wherein:
generating the LTE signal comprises sampling at twice a conventional LTE sampling rate; and
generating the Wi-Fi signal comprises sampling at three times a conventional Wi-Fi sampling rate.

5. The method of claim 1 , wherein the Wi-Fi signal is transmitted via a Wi-Fi processor embedded in an LTE processor.

6. The method of claim 5 , wherein the Wi-Fi signal is transmitted via a transceiver shared by a Wi-Fi baseband (BB) and an LTE BB.

7. The method of claim 1 , wherein the Wi-Fi signal is transmitted via a Wi-Fi processor specific to an LTE processor.

8. The method of claim 7 , wherein a clear-to-send (CTS)-to-self signal is input to the Wi-Fi processor.

9. The method of claim 8 , wherein the CTS-to-self signal is a cross-subframe signal scheduled by a network.

10. The method of claim 9 , wherein the cross-subframe scheduling includes at least initiation of the CTS-to-self signal, a duration of the CTS-to-self signal, or a receiver address of the device.

11. The method of claim 1 , wherein the LTE signal is transmitted according to a Wi-Fi subcarrier spacing and a Wi-Fi fast Fourier transform size.

12. A device supporting long-term evolution (LTE) in an unlicensed spectrum, the device comprising:
a memory configured to store information;
a transceiver configured to transmit and receive signals; and
a processor coupled to the memory and the transceiver and configured to:
generate an LTE signal using a digital-to-analog converter (DAC);
generate a Wi-Fi signal emulated in the generated LTE signal using the same DAC;
control the transceiver to transmit the generated LTE signal; and
control the transceiver to transmit the generated Wi-Fi signal,
wherein the generated LTE signal and the generated Wi-Fi signal are over-sampled to align a sampling rate of the generated LTE signal and the generated Wi-Fi signal.

13. The device of claim 12 , wherein the generated Wi-Fi signal is a clear-to-send-to-self based channel reservation.

14. The device of claim 12 , wherein the processor is further configured to:
precode the generated Wi-Fi signal by binary phase shift keying; and
map the precoded Wi-Fi signal to resource elements.

15. The device of claim 12 , wherein:
generating the LTE signal comprises sampling at twice a conventional LTE sampling rate; and
generating the Wi-Fi signal comprises sampling at three times a conventional Wi-Fi sampling rate.

16. The device of claim 12 , wherein the Wi-Fi signal is transmitted via a Wi-Fi processor embedded in an LTE processor.

17. The device of claim 16 , wherein the Wi-Fi signal is transmitted via a transceiver shared by a Wi-Fi baseband (BB) and an LTE BB.

18. The device of claim 12 , wherein the Wi-Fi signal is transmitted via a Wi-Fi processor specific to an LTE processor.

19. The device of claim 18 , wherein a clear-to-send-to-self signal is input to the Wi-Fi processor.

20. The device of claim 12 , wherein the LTE signal is transmitted according to a Wi-Fi subcarrier spacing and a Wi-Fi fast Fourier transform size.

Assignees

• Lg Electronics Inc

Inventors

• Yi Yunjung
• You Hyangsun
• Kim Byounghoon
• Kim Seonwook
• Ahn Joonkui
• Kim Kijun

Classifications

• H04W74/0816

  with collision avoidance · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W16/14

  Spectrum sharing arrangements {between different networks} · CPC title

• H04L27/2656 Primary

  Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation · CPC title

• H04L27/2662

  Symbol synchronisation · CPC title