IP Library › Granted Patent US 11,438,114

Granted Patent B2

US 11,438,114 · App. 16/932,505 · Granted Sep 6, 2022

System and method for an adaptive frame structure with filtered OFDM

Inventors: Kelvin Kar Kin Au (Kanata, CA); Jianglei Ma (Ottawa, CA); Liqing Zhang (Ottawa, CA)

Assignee: Huawei Technologies Co., Ltd.

H04L5/0048 H04L5/003 H04L5/006 H04L5/0007 H04L5/0064 H04L5/0069 H04L5/0076 H04L27/2602 H04L27/264 H04L5/06 H04L27/2607

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Quick Facts

Patent No.: US 11,438,114
App. No.: 16/932,505
Granted: Sep 6, 2022
Kind: B2

External Links

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Abstract

Different filtered-orthogonal frequency division multiplexing (f-OFDM) frame formats may be used to achieve the spectrum flexibility. F-OFDM waveforms are generated by applying a pulse shaping digital filter to an orthogonal frequency division multiplexed (OFDM) signal. Different frame formats may be used to carry different traffic types as well as to adapt to characteristics of the channel, transmitter, receiver, or serving cell. The different frame formats may utilize different sub-carrier (SC) spacings and/or cyclic prefix (CP) lengths. In some embodiments, the different frame formats also utilize different symbol durations and/or transmission time interval (TTI) lengths.

Claims (97)

1. A method for transmitting signals in a wireless network, the method comprising:

transmitting, by a transmitter, to a user equipment (UE), higher-layer signaling that indicates first frame structure parameters and a first sub-band; and

communicating, by the transmitter, with the UE, a first signal in the first sub-band using the first frame structure parameters,

wherein the first frame structure parameters comprise a first sub-carrier spacing, and wherein the higher-layer signaling comprises a first index for configuring the first sub-carrier spacing, a second index for configuring the first sub-band and/or a frequency offset from a reference value associated with the first sub-band.

2. The method of claim 1 , wherein the first frame structure parameters further comprise a first cyclic prefix length, and the higher-layer signaling comprises the first index for configuring the first sub-carrier spacing and the first cyclic prefix length; and/or

wherein the first frame structure parameters further comprise a first symbol duration, the higher-layer signaling comprises the first index for configuring the first sub-carrier spacing and a length of the first symbol duration.

3. The method of claim 1 , wherein the first frame structure parameters comprise a transmission time interval (TTI), the method further comprising:

transmitting, by the transmitter, to the UE, a parameter for configuring a length of the TTI.

4. The method of claim 1 , wherein the first sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

5. The method of claim 1 , wherein the first sub-band is a first filtered-orthogonal frequency division multiplexing (f-OFDM) sub-band.

6. The method of claim 1 , the method further comprising:

transmitting, by the transmitter, to the UE, downlink related signaling indicating default frame structure parameters when the UE initially accesses a network; and

transmitting, by the transmitter, to the UE, a second signal in a default sub-band with the default frame structure parameters.

7. The method of claim 6 , wherein the default sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

8. The method of claim 6 , wherein the default frame structure parameters comprise a second sub-carrier spacing, and the second sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

9. The method of claim 1 , wherein the higher-layer signaling is transmitted via default frame structure parameters or a second frame structure parameters.

10. The method of claim 9 , further comprising:

before transmitting the higher-layer signaling, communicating, by the transmitter, with the UE, a second signal in a second sub-band with the second frame structure parameters, wherein the second sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

11. The method of claim 1 , further comprising:

continuously or periodically transmitting, by the transmitter, a set of default frame structure parameters in time.

12. The method of claim 1 , wherein the first frame structure parameters correspond to a frame format assigned to a semi-static allocation period.

13. A transmitter comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:

transmit, to a user equipment (UE), higher-layer signaling that indicates first frame structure parameters and a first sub-band; and

communicate, with the UE, a first signal in the first sub-band using the first frame structure parameters,

14. The transmitter of claim 13 , wherein the first frame structure parameters further comprise a first cyclic prefix length, and the higher-layer signaling comprises the first index for configuring the first sub-carrier spacing and the first cyclic prefix length; and/or

15. The transmitter of claim 13 , wherein the first frame structure parameters comprise a transmission time interval (TTI), and wherein the programming further includes instructions to:

transmit to the UE a parameter for configuring a length of the TTI.

16. The transmitter of claim 13 , wherein the first sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

17. The transmitter of claim 13 , wherein the first sub-band is a first filtered-orthogonal frequency division multiplexing (f-OFDM) sub-band.

18. The transmitter of claim 13 , wherein the programming further includes instructions to:

transmit, to the UE, downlink related signaling indicating default frame structure parameters when the UE initially accesses a network; and

transmit, to the UE, a second signal in a default sub-band with the default frame structure parameters.

19. The transmitter of claim 18 , wherein the default sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

20. The transmitter of claim 18 , wherein the default frame structure parameters comprise a second sub-carrier spacing, and the second sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

21. The transmitter of claim 13 , wherein the higher-layer signaling is transmitted via default frame structure parameters or a second frame structure parameters.

22. The transmitter of claim 21 , wherein the programming further includes instructions to:

before transmitting the higher-layer signaling, communicate, with the UE, a second signal in a second sub-band with the second frame structure parameters, wherein the second sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

23. A method for receiving signals in a wireless network, the method comprising:

receiving, by an apparatus, from a transmitter, higher-layer signaling that indicates first frame structure parameters and a first sub-band; and

communicating, by the apparatus, with the transmitter, a first signal in the first sub-band using the first frame structure parameters,

24. The method of claim 23 , wherein the first frame structure parameters further comprise a first cyclic prefix length, and the higher-layer signaling comprises the first index for configuring the first sub-carrier spacing and the first cyclic prefix length; and/or

25. The method of claim 23 , wherein the first frame structure parameters comprise a transmission time interval (TTI), the method further comprising:

receiving, by the apparatus, from the transmitter, a parameter for configuring a length of the TTI.

26. The method of claim 23 , wherein the first sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

27. The method of claim 23 , wherein the first sub-band is a first filtered-orthogonal frequency division multiplexing (f-OFDM) sub-band.

28. The method of claim 23 , the method further comprising:

receiving, by the apparatus, from the transmitter, downlink related signaling indicating default frame structure parameters when the apparatus initially accesses a network; and

receiving, by the apparatus, from the transmitter, a second signal in a default sub-band with the default frame structure parameters.

29. The method of claim 28 , wherein the default sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

30. The method of claim 28 , wherein the default frame structure parameters comprise a second sub-carrier spacing, and the second sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

31. The method of claim 23 , wherein the higher-layer signaling is transmitted via default frame structure parameters or a second frame structure parameters.

32. The method of claim 31 , further comprising:

before receiving the higher-layer signaling, communicating, by the apparatus, with the transmitter, a second signal in a second sub-band with the second frame structure parameters, wherein the second sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

33. An apparatus comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:

receive, from a transmitter, higher-layer signaling that indicates first frame structure parameters and a first sub-band; and

communicate, with the transmitter, a first signal in the first sub-band using the first frame structure parameters,

34. The apparatus of claim 33 , wherein the first frame structure parameters further comprise a first cyclic prefix length, and the higher-layer signaling comprises the first index for configuring the first sub-carrier spacing and the first cyclic prefix length; and/or

35. The apparatus of claim 33 , wherein the first frame structure parameters comprise a transmission time interval (TTI), and wherein the programming further includes instructions to:

receive, from the transmitter, a parameter for configuring a length of the TTI.

36. The apparatus of claim 33 , wherein the first sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

37. The apparatus of claim 33 , wherein the first sub-band is a first filtered-orthogonal frequency division multiplexing (f-OFDM) sub-band.

38. The apparatus of claim 33 , wherein the programming further includes instructions to:

receive, from the transmitter, downlink related signaling indicating default frame structure parameters when the apparatus initially accesses a network; and

receive, from the transmitter, a second signal in a default sub-band with the default frame structure parameters.

39. The apparatus of claim 38 , wherein the default sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

40. The apparatus of claim 38 , wherein the default frame structure parameters comprise a second sub-carrier spacing, and the second sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

41. The apparatus of claim 33 , wherein the higher-layer signaling is transmitted via default frame structure parameters or a second frame structure parameters.

42. The apparatus of claim 41 , wherein the programming further includes instructions to:

before receiving the higher-layer signaling, communicate, with the transmitter, a second signal in a second sub-band with the second frame structure parameters, wherein the second sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

43. A wireless network comprising:

a backhaul network; and

an access point (AP) communicatively coupled to the backhaul network, the AP configured to transmit, to a user equipment (UE), higher-layer signaling that indicates first frame structure parameters and a first sub-band and to communicate, with the UE, a first signal in the first sub-band using the first frame structure parameters,

44. The wireless network of claim 43 , wherein the first frame structure parameters further comprise a first cyclic prefix length, and the higher-layer signaling comprises the first index for configuring the first sub-carrier spacing and the first cyclic prefix length; and/or

45. The wireless network of claim 43 , wherein the first frame structure parameters comprise a transmission time interval (TTI), and wherein the AP is further configured to:

transmit to the UE a parameter for configuring a length of the TTI.

46. The wireless network of claim 43 , wherein the first sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

47. The wireless network of claim 43 , wherein the first sub-band is a first filtered-orthogonal frequency division multiplexing (f-OFDM) sub-band.

48. The wireless network of claim 43 , wherein the AP is further configured to:

transmit, to the UE, downlink related signaling indicating default frame structure parameters when the UE initially accesses a network; and

transmit, to the UE, a second signal in a default sub-band with the default frame structure parameters.

49. The wireless network of claim 48 , wherein the default sub-band and the first sub-band are non-overlapping sub-bands in a same system bandwidth.

50. The wireless network of claim 48 , wherein the default frame structure parameters comprise a second sub-carrier spacing, and the second sub-carrier spacing is 15 kilohertz (kHz), 30 kHz, or 60 kHz.

51. The wireless network of claim 43 , wherein the higher-layer signaling is transmitted via default frame structure parameters or a second frame structure parameters.

52. The wireless network of claim 51 , wherein the AP is further configured to:

Continuity (5)

Continuation 16222650 · Dec 17, 2018

Continuation 15977850 · May 11, 2018

Continuation 15004430 · Jan 22, 2016

Provisional Application 62140995 · Mar 31, 2015

Related Publication 20200351052A1 · Nov 5, 2020