Power saving method in wireless communication system

• US 10,863,480 B2
• Filed: 03/02/2018
• Issued: 12/08/2020
• Est. Priority Date: 10/28/2009
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lee, Il-Gu, Lee, Sok-Kyu, Chung, Hyun-Kyu, Kim, Dae-Sik
• Primary Examiner(s): Harper, Kevin C.
• Application Number:
  US15/910,879
• Publication Number:
  US 20180192377A1
• Time in Patent Office: 1,012 Days
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 47/70 Admission control; Resource allocation
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus of accessing a channel in a wireless local area network is provided. A destination station receives a request to send (RTS) frame to allocate a network allocation vector from a source station over a first bandwidth and transmits a clear to send (CTS) frame over a second bandwidth to the source station in response to the RTS frame. The second bandwidth is dynamically determined when a first parameter has a predetermined value.

Claims

1. A communication method for receiving user data, the method comprising:

receiving, from a first station, a request to send (RTS) frame on each of a set of channels;

selecting one or more channels from the set of channels;

transmitting, to the first station, a clear to send (CTS) frame on each of the selected one or more channels; and

receiving, from the first station, a first frame comprising the user data using only the selected one or more channels among the set of channels,

wherein the RTS frame comprises bandwidth information which indicates a combined bandwidth of the set of channels.

2. The communication method of claim 1, wherein each of the set of channels is a 20 MHz band.

3. The communication method of claim 1, wherein the bandwidth information comprises two bits which indicate a bandwidth selected from a group of 20 MHz, 40 MHz, 80 MHz and 160 MHz.

4. The communication method of claim 1, wherein the RTS frame comprises information indicating that the first station supports a dynamic bandwidth operation.

5. The communication method of claim 1, wherein the CTS frame comprises bandwidth information which indicates a combined bandwidth of the selected one or more channels and information indicating that a second station transmitting the CTS frame is capable of selecting the one or more channels from the set of channels.

31. The communication method of claim 1, wherein all of the selected one or more channels are used to receive the user data from the first station.

37. The communication method of claim 1, wherein a number of channels in the set of channels is greater than a number of channels in the selected one or more channels.

43. The communication method of claim 1, further comprising transmitting a second frame to the first station, wherein the second frame comprises information indicating a number of streams.

44. The communication method of claim 43, wherein the first frame is transmitted from the first station based on the information indicating a number of streams.

45. The communication method of claim 44, wherein the first frame comprises information indicating a signal to noise ratio.

6. An apparatus for receiving user data, the apparatus comprising:

a circuitry,

wherein the circuitry is configured to;

cause the apparatus to receive, from a first station, a request to send (RTS) frame on each of a set of channels;

select one or more channels from the set of channels;

cause the apparatus to transmit, to the first station, a clear to send (CTS) frame on each of the selected one or more channels; and

cause the apparatus to receive, from the first station, a first frame comprising the user data using only the selected one or more channels among the set of channels,

wherein the RTS frame comprises bandwidth information which indicates a combined bandwidth of the set of channels.

7. The apparatus of claim 6, wherein each of the set of channels is a 20 MHz band.

8. The apparatus of claim 6, wherein the bandwidth information comprises two bits which indicate a bandwidth selected from a group of 20 MHz, 40 MHz, 80 MHz and 160 MHz.

9. The apparatus of claim 6, wherein the RTS frame comprises information indicating that the first station supports a dynamic bandwidth operation.

10. The apparatus of claim 6, wherein the CTS frame comprises bandwidth information which indicates a combined bandwidth of the selected one or more channels and information indicating that a second station transmitting the CTS frame is capable of selecting the one or more channels from the set of channels.

32. The apparatus of claim 6, wherein all of the selected one or more channels are used to receive the user data from the first station.

38. The apparatus of claim 6, wherein a number of channels in the set of channels is greater than a number of channels in the selected one or more channels.

46. The apparatus of claim 6, wherein the circuitry is further configured to cause the apparatus to transmit a second frame to the first station, wherein the second frame comprises information indicating a number of streams.

47. The apparatus of claim 46, wherein the first frame is transmitted from the first station based on the information indicating a number of streams.

48. The apparatus of claim 47, wherein the first frame comprises information indicating a signal to noise ratio.

11. A device configured to be used in a wireless communication station capable of receiving user data, the device comprising:

a circuitry,

wherein the circuitry is configured to;

cause the wireless communication station to receive, from another station, a request to send (RTS) frame on each of a set of channels;

select one or more channels from the set of channels;

cause the wireless communication station to transmit, to the another station, a clear to send (CTS) frame on each of the selected one or more channels; and

cause the wireless communication station to receive, from the another station, a first frame comprising the user data using only the selected one or more channels among the set of channels,

wherein the RTS frame comprises bandwidth information which indicates a combined bandwidth of the set of channels.

12. The device of claim 11, wherein each of the set of channels is a 20 MHz band.

13. The device of claim 11, wherein the bandwidth information comprises two bits which indicate a bandwidth selected from a group of 20 MHz, 40 MHz, 80 MHz and 160 MHz.

14. The device of claim 11, wherein the RTS frame comprises information indicating that the another station supports a dynamic bandwidth operation.

15. The device of claim 11, wherein the CTS frame comprises bandwidth information which indicates a combined bandwidth of the selected one or more channels and information indicating that a second station transmitting the CTS frame is capable of selecting the one or more channels from the set of channels.

33. The device of claim 11, wherein all of the selected one or more channels are used to receive the user data from the another station.

39. The device of claim 11, wherein a number of channels in the set of channels is greater than a number of channels in the selected one or more channels.

49. The device of claim 11, wherein the circuitry is further configured to cause the wireless communication station to transmit a second frame to the another station, wherein the second frame comprises information indicating a number of streams.

50. The device of claim 49, wherein the first frame is transmitted from the another station based on the information indicating a number of streams.

51. The device of claim 50, wherein the first frame comprises information indicating a signal to noise ratio.

16. A communication method for transmitting user data, the method comprising:

transmitting, to a first station, a request to send (RTS) frame on each of a set of channels;

receiving, from the first station, a clear to send (CTS) frame on each of one or more channels selected by the first station among the set of channels; and

transmitting, to the first station, a first frame comprising the user data using only the selected one or more channels among the set of channels,

wherein the RTS frame comprises bandwidth information which indicates a combined bandwidth of the set of channels.

17. The communication method of claim 16, wherein each of the set of channels is a 20 MHz band.

18. The communication method of claim 16, wherein the bandwidth information comprises two bits which indicate a bandwidth selected from a group of 20 MHz, 40 MHz, 80 MHz and 160 MHz.

19. The communication method of claim 16, wherein the RTS frame comprises information indicating that the first station supports a dynamic bandwidth operation.

20. The communication method of claim 16, wherein the CTS frame comprises bandwidth information which indicates a combined bandwidth of the selected one or more channels and information indicating that a second station transmitting the CTS frame is capable of selecting the one or more channels from the set of channels.

34. The method of claim 16, wherein all of the selected one or more channels are used to transmit the user data to the first station.

40. The device of claim 16, wherein a number of channels in the set of channels is greater than a number of channels in the selected one or more channels.

52. The communication method of claim 16, further comprising receiving a second frame from the first station, wherein the second frame comprises information indicating a number of streams.

53. The communication method of claim 52, wherein the first frame is transmitted to the first station based on the information indicating a number of streams.

54. The communication method of claim 53, wherein the first frame comprises information indicating a signal to noise ratio.

21. An apparatus for transmitting user data, the apparatus comprising:

a circuitry,

wherein the circuitry is configured to;

cause the apparatus to transmit, to a first station, a request to send (RTS) frame on each of a set of channels;

cause the apparatus to receive, from the first station, a clear to send (CTS) frame on each of one or more channels selected by the first station among the set of channels; and

cause the apparatus to transmit, to the first station, a first frame comprising the user data using only the selected one or more channels among the set of channels,

wherein the RTS frame comprises bandwidth information which indicates a combined bandwidth of the set of channels.

22. The apparatus of claim 21, wherein each of the set of channels is a 20 MHz band.

23. The apparatus of claim 21, wherein the bandwidth information comprises two bits which indicate a bandwidth selected from a group of 20 MHz, 40 MHz, 80 MHz and 160 MHz.

24. The apparatus of claim 21, wherein the RTS frame comprises information indicating that the first station supports a dynamic bandwidth operation.

25. The apparatus of claim 21, wherein the CTS frame comprises bandwidth information which indicates a combined bandwidth of the selected one or more channels and information indicating that a second station transmitting the CTS frame is capable of selecting the one or more channels from the set of channels.

35. The apparatus of claim 21, wherein all of the selected one or more channels are used to transmit the user data to the first station.

41. The apparatus of claim 21, wherein a number of channels in the set of channels is greater than a number of channels in the selected one or more channels.

55. The apparatus of claim 21, wherein the circuitry is further configured to cause the apparatus to receive a second frame from the first station, wherein the second frame comprises information indicating a number of streams.

56. The apparatus of claim 55, wherein the first frame is transmitted to the first station based on the information indicating a number of streams.

57. The apparatus of claim 56, wherein the first frame comprises information indicating a signal to noise ratio.

26. A device configured to be used in a wireless communication station capable of transmitting user data, the device comprising:

a circuitry,

wherein the circuitry is configured to;

cause the wireless communication station to transmit, to another station, a request to send (RTS) frame on each of a set of channels;

cause the wireless communication station to receive, from the another station, a clear to send (CTS) frame on each of one or more channels selected by the first another station among the set of channels; and

cause the wireless communication station to transmit, to the another station, a first frame comprising the user data using only the selected one or more channels among the set of channels,

wherein the RTS frame comprises bandwidth information which indicates a combined bandwidth of the set of channels.

27. The device of claim 26, wherein each of the set of channels is a 20 MHz band.

28. The device of claim 26, wherein the bandwidth information comprises two bits which indicate a bandwidth selected from a group of 20 MHz, 40 MHz, 80 MHz and 160 MHz.

29. The device of claim 26, wherein the RTS frame comprises information indicating that the another station supports a dynamic bandwidth operation.

30. The device of claim 26, wherein the CTS frame comprises bandwidth information which indicates a combined bandwidth of the selected one or more channels and

information indicating that a second station transmitting the CTS frame is capable of selecting the one or more channels from the set of channels.

36. The device of claim 26, wherein all of the selected one or more channels are used to transmit the user data to the another station.

42. The device of claim 26, wherein a number of channels in the set of channels is greater than a number of channels in the selected one or more channels.

58. The device of claim 26, wherein the circuitry is further configured to cause the wireless communication station to receive a second frame from the another station, wherein the second frame comprises information indicating a number of streams.

59. The apparatus of claim 58, wherein the first frame is transmitted to the another station based on the information indicating a number of streams.

60. The apparatus of claim 59, wherein the first frame comprises information indicating a signal to noise ratio.