Method and apparatus for configuring frame structure for new radio access technology in wireless communication system

• US 10,574,502 B2
• Filed: 05/22/2017
• Issued: 02/25/2020
• Est. Priority Date: 05/22/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Yunjung, Kim, Kijun, Kim, Byounghoon
• Primary Examiner(s): Adhami, Mohammad S
• Application Number:
  US16/064,892
• Publication Number:
  US 20190075006A1
• Time in Patent Office: 1,009 Days
• Field of Search: None
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2666 Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

For supporting a new radio access technology (new RAT, or NR), a frame structure for the new RAT may be configured. A network node configures a frame in which a first cyclic prefix (CP) is allocated to a first symbol in every 0.5 ms and a second CP is allocated to remaining symbols in every 0.5 ms. In this case, a length of the first CP is longer than a length of the second CP.

Claims

1. A method for configuring a frame by a network node in a wireless communication system, the method comprising:

determining whether a subcarrier spacing is (i) a first subcarrier spacing of 15 kHz, or (ii) a second subcarrier spacing that is 2^m times the first subcarrier spacing, where m is a natural number that represents a subcarrier spacing configuration;

based on a determination that the subcarrier spacing is equal to the first subcarrier spacing;

configuring a first plurality of symbols such that (i) a first cyclic prefix (CP) is allocated to a first symbol and to every 7-th symbol after the first symbol in the first plurality of symbols, and (ii) a second CP is allocated to remaining symbols in the first plurality of symbols, wherein a length of the first CP is longer than a length of the second CP;

based on a determination that the subcarrier spacing is equal to the second subcarrier spacing;

configuring a second plurality of symbols such that (i) a third CP is allocated to the first symbol and to every 7*2^m-th symbol after the first symbol in the second plurality of symbols, and (ii) a fourth CP is allocated to remaining symbols in the second plurality of symbols, wherein a length of the third CP is longer than a length of the fourth CP; and

communicating with a user equipment (UE) by using the first plurality of symbols or the second plurality of symbols, based on whether the subcarrier spacing is the first subcarrier spacing or the second subcarrier spacing.

2. The method of claim 1, wherein the length of the first CP, the length of the second CP, the length of the third CP, and the length of the fourth CP, in terms of sampling time, each depends on the subcarrier spacing.

3. The method of claim 1, wherein the first plurality of symbols defines a first time duration with the first subcarrier spacing, and

wherein the first subcarrier spacing is a reference subcarrier spacing.

4. The method of claim 3, wherein the first time duration consists of 7 orthogonal frequency division multiplexing (OFDM) symbols based on the reference subcarrier spacing.

5. The method of claim 3, wherein the second plurality of symbols defines a second time duration with the second subcarrier spacing.

6. The method of claim 5, wherein the first time duration and the second time duration are aligned with each other at OFDM symbol level.

7. The method of claim 5, wherein the first time duration and the second time duration are aligned with each other at slot level.

8. The method of claim 5, wherein the first time duration and the second time duration are aligned with each other at subframe level.

15. The method of claim 5, wherein the first time duration and the second time duration are aligned with each other at every 0.5 ms.

9. A network node configured to operate in a wireless communication system, the network node comprising:

a transceiver;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising;

determining whether a subcarrier spacing is (i) a first subcarrier spacing of 15 kHz, or (ii) a second subcarrier spacing that is 2^m times the first subcarrier spacing, where m is a natural number that represents a subcarrier spacing configuration;

based on a determination that the subcarrier spacing is equal to the first subcarrier spacing;

configuring a first plurality of symbols such that (i) a first cyclic prefix (CP) is allocated to a first symbol and to every 7-th symbol after the first symbol in the first plurality of symbols, and (ii) a second CP is allocated to remaining symbols in the first plurality of symbols, wherein a length of the first CP is longer than a length of the second CP;

based on a determination that the subcarrier spacing is equal to the second subcarrier spacing;

configuring a second plurality of symbols such that (i) a third CP is allocated to the first symbol and to every 7*2^m-th symbol after the first symbol in the second plurality of symbols, and (ii) a fourth CP is allocated to remaining symbols in the second plurality of symbols, wherein a length of the third CP is longer than a length of the fourth CP; and

controlling the transceiver to communicate with a user equipment (UE) by using the first plurality of symbols or the second plurality of symbols, based on whether the subcarrier spacing is the first subcarrier spacing or the second subcarrier spacing.

10. The network node of claim 9, wherein the length of the first CP, the length of the second CP, the length of the third CP, and the length of the fourth CP, in terms of sampling time, each depends on the subcarrier spacing.

11. The network node of claim 9, wherein the first plurality of symbols defines a first time duration with the first subcarrier spacing, and

wherein the first subcarrier spacing is a reference subcarrier spacing.

12. The network node of claim 11, wherein the first time duration consists of 7 orthogonal frequency division multiplexing (OFDM) symbols based on the reference subcarrier spacing.

13. The network node of claim 11, wherein the second plurality of symbols defines a second time duration with the second subcarrier spacing.

14. The network node of claim 13, wherein the first time duration and the second time duration are aligned with each other at OFDM symbol level or slot level or subframe level.

16. The network node of claim 13, wherein the first time duration and the second time duration are aligned with each other at every 0.5 ms.