Method of transmitting reference signal for channel state change measurement and apparatus therefor

• US 11,075,734 B2
• Filed: 03/20/2019
• Issued: 07/27/2021
• Est. Priority Date: 01/09/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyunsoo, Kim, Kijun
• Primary Examiner(s): Huynh, Dung B
• Application Number:
  US16/359,932
• Publication Number:
  US 20190222389A1
• Time in Patent Office: 860 Days
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• 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 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2634 Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

Disclosed herein is a method of transmitting a reference signal for channel state change measurement and an apparatus therefor. The method includes receiving, from a transmitter, a first type reference signal of a first resource mapping pattern and a second type reference signal of a second resource mapping pattern. The receiver receives the first type reference signal under an assumption that the first type reference signal is associated with the second type reference signal, when a specific condition is satisfied.

Claims

1. A method for receiving reference signals by a user equipment (UE) in wireless communication, the method comprising:

receiving, from a base station (BS), resource information;

receiving, from the BS, a first sequence for a Demodulation Reference Signal (DMRS) based on the resource information; and

receiving, from the BS, a second sequence for a Phase Tracking Reference Signal (PTRS),

wherein the resource information includes information on a first resource element (RE) group for the DMRS in an orthogonal frequency division multiplexing (OFDM) symbol, and the information informs the UE whether or not a second RE group in the OFDM symbol is used for receiving data,

wherein each of the first RE group and the second RE group includes REs having a predetermined interval in the OFDM symbol,

wherein the first sequence for the DMRS is received in the first RE group and the data is received or not in the second RE group based on the resource information,

wherein elements of the second sequence are determined among the elements of the first sequence at equal element intervals, and

wherein the PTRS is received every N OFDM symbols, where N is greater than 1.

2. The method according to claim 1, wherein the DMRS is generated based on a cyclic prefix-OFDM (CP-OFDM) method.

3. The method according to claim 1, wherein the PTRS is mapped at equal frequency intervals within a plurality of resource blocks.

4. The method according to claim 1, wherein each element of the second sequence is used for each subcarrier for the PTRS.

5. The method according to claim 1, wherein the second sequence for PTRS is received based on information indicating that PTRS is present.

6. The method according to claim 1, wherein the second sequence for PTRS is received via a RE not used for the DMRS.

14. The method according to claim 1, wherein the DMRS is generated based on a cyclic prefix-OFDM (CP-OFDM) method.

15. The method according to claim 1, wherein a first element of the second sequence is determined as element of the first sequence related to an offset.

7. An apparatus for receiving reference signals in wireless communication, the apparatus comprising:

a memory; and

at least one processor coupled to the memory and configured to;

receive, from a base station (BS), resource information;

receive, from the BS, a first sequence for a Demodulation Reference Signal (DMRS) based on the resource information; and

receive, from the BS, a second sequence for a Phase Tracking Reference Signal (PTRS),

wherein the resource information includes information on a first resource element (RE) group for the DMRS in an orthogonal frequency division multiplexing (OFDM) symbol, and the information informs the UE whether or not a second RE group in the OFDM symbol is used for receiving data,

wherein each of the first RE group and the second RE group includes REs having a predetermined interval in the OFDM symbol,

wherein the first sequence for the DMRS is received in the first RE group and the data is received or not in the second RE group based on the resource information,

wherein elements of the second sequence are determined among the elements of the first sequence at equal element intervals, and

wherein the PTRS is received every N OFDM symbols, where N is greater than 1.

8. The apparatus according to claim 7, wherein the DMRS is generated based on a cyclic prefix-OFDM (CP-OFDM) method.

9. The apparatus according to claim 7, wherein the PTRS is mapped at equal frequency intervals within a plurality of resource blocks.

10. The apparatus according to claim 7, wherein each element of the second sequence is used for each subcarrier for the PTRS.

11. The apparatus according to claim 7, wherein the second sequence for PTRS is received based on information indicating that PTRS is present.

12. The apparatus according to claim 7, wherein the second sequence for PTRS is received via a RE not used for the DMRS.

16. The apparatus according to claim 7, wherein the elements of the second sequence are the elements of the first sequence mapped to a same symbol.

17. The apparatus according to claim 7, wherein a first element of the second sequence is determined as element of the first sequence related to an offset.

13. A method for transmitting reference signal by a base station (BS) in wireless communication, the method comprising:

transmitting, to a user equipment (UE), resource information;

transmitting, to the UE, a first sequence for a Demodulation Reference Signal (DMRS) based on the resource information; and

transmitting, to the UE, a second sequence for a Phase Tracking Reference Signal (PTRS),

wherein the resource information includes information on a first resource element (RE) group for the DMRS in an orthogonal frequency division multiplexing (OFDM) symbol, and the information informs the UE whether or not a second RE group in the OFDM symbol is used for receiving data,

wherein each of the first RE group and the second RE group includes REs having a predetermined interval in the OFDM symbol,

wherein the first sequence for the DMRS is transmitted in the first RE group and the data is received or not in the second RE group based on the resource information,

wherein elements of the second sequence are determined among the elements of the first sequence at equal element intervals, and

wherein the PTRS is received every N OFDM symbols, where N is greater than 1.