Method for reporting channel state information in wireless communication system supporting unlicensed band, and apparatus for supporting same

• US 10,560,171 B2
• Filed: 06/26/2017
• Issued: 02/11/2020
• Est. Priority Date: 06/30/2016
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Seonwook, Ahn, Joonkui, Yang, Suckchel, Hwang, Daesung
• Primary Examiner(s): Sefcheck, Gregory B
• Application Number:
  US16/313,399
• Publication Number:
  US 20190140727A1
• Time in Patent Office: 960 Days
• Field of Search: None
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]

Abstract

Disclosed are a method for a terminal to report channel state information (CSI) to a base station, and an apparatus for supporting the same. More specifically, disclosed are a method for a terminal to report CSI in a wireless communication system supporting an unlicensed band by transmitting a physical uplink shared channel (PUSCH) which only includes the CSI without an uplink shared channel (UL-SCH), and apparatuses for supporting the same.

Claims

1. A method for operating a User Equipment (UE) in a wireless communication system, the wireless communication system including a base station (BS) and supporting communications in an unlicensed band, the method performed by the UE and comprising:

receiving, from the BS, an uplink (UL) grant for scheduling an uplink transmission in the unlicensed band,

wherein the UL grant includes downlink control information (DCI), the DCI including information for scheduling a transmission of a Physical Uplink Shared Channel (PUSCH) that includes aperiodic channel state information (CSI);

based on the UL grant, transmitting the PUSCH to the BS,

wherein the PUSCH only includes the aperiodic CSI, and is transmitted in a single subframe, based on;

a value of a Modulation and Coding Scheme (MCS) field included in the DCI,

a CSI request bit included in the DCI, and

a number of subframes to be used for the PUSCH being set to 1,

wherein the number of scheduled subframes being set to 1 is included in the DCI when the DCI corresponds to a first specific DCI format, or the number of scheduled subframes being set to 1 is preassigned when the DCI corresponds to a second specific DCI format,

wherein the first specific DCI format is DCI format 0B or 4B,

wherein the second specific DCI format is DCI format 0A or 4A, and

wherein the MCS field value is 29.

2. A User Equipment (UE) for operating in a wireless communication system, the wireless communication system including a base station (BS) and supporting communications in an unlicensed band, the UE comprising:

a memory;

a transceiver; and

a processor operatively connected to the memory and the transceiver, the processor for;

receiving, from the BS, an uplink (UL) grant for scheduling an uplink transmission in the unlicensed band,

wherein the UL grant includes downlink control information (DCI), the DCI including information for scheduling a transmission of a Physical Uplink Shared Channel (PUSCH) that includes aperiodic channel state information (CSI);

based on the UL grant, transmitting the PUSCH to the BS,

wherein the PUSCH only includes the aperiodic CSI, and is transmitted in a single subframe, based on;

a value of a Modulation and Coding Scheme (MCS) field included in the DCI,

a CSI request bit included in the DCI, and

a number of subframes to be used for the PUSCH being set to 1,

wherein the number of scheduled subframes being set to 1 is included in the DCI when the DCI corresponds to a first specific DCI format, or the number of scheduled subframes being set to 1 is preassigned when the DCI corresponds to a second specific DCI format,

wherein the first specific DCI format is DCI format 0B or 4B,

wherein the second specific DCI format is DCI format 0A or 4A, and

wherein the MCS field value is 29.

3. A method for operating a base station (BS) in a wireless communication system, the wireless communication system including a User Equipment (UE) and supporting communications in an unlicensed band, the method performed by the BS and comprising:

transmitting, to the UE, an uplink (UL) grant for scheduling an uplink transmission in the unlicensed band,

wherein the UL grant includes downlink control information (DCI), the DCI including information for scheduling a transmission of a Physical Uplink Shared Channel (PUSCH) that includes aperiodic channel state information (CSI);

based on the UL grant, receiving the PUSCH from the UE,

wherein the PUSCH only includes the aperiodic CSI, and is transmitted in a single subframe, based on;

a value of a Modulation and Coding Scheme (MCS) field included in the DCI,

a CSI request bit included in the DCI, and

a number of subframes to be used for the PUSCH being set to 1,

wherein the number of scheduled subframes being set to 1 is included in the DCI when the DCI corresponds to a first specific DCI format, or the number of scheduled subframes being set to 1 is preassigned when the DCI corresponds to a second specific DCI format,

wherein the first specific DCI format is DCI format 0B or 4B,

wherein the second specific DCI format is DCI format 0A or 4A, and

wherein the MCS field value is 29.

4. A base station (BS) for operating in a wireless communication system, the wireless communication system including a User Equipment (UE) and supporting communications in an unlicensed band, the BS comprising:

a memory;

a transceiver; and

a processor operatively connected to the memory and the transceiver, the processor for;

transmitting, to the UE, an uplink (UL) grant for scheduling an uplink transmission in the unlicensed band,

wherein the UL grant includes downlink control information (DCI), the DCI including information for scheduling a transmission of a Physical Uplink Shared Channel (PUSCH) that includes aperiodic channel state information (CSI);

based on the UL grant, receiving the PUSCH from the UE,

wherein the PUSCH only includes the aperiodic CSI, and is transmitted in a single subframe, based on;

a value of a Modulation and Coding Scheme (MCS) field included in the DCI,

a CSI request bit included in the DCI, and

a number of subframes to be used for the PUSCH being set to 1,

wherein the number of scheduled subframes being set to 1 is included in the DCI when the DCI corresponds to a first specific DCI format, or the number of scheduled subframes being set to 1 is preassigned when the DCI corresponds to a second specific DCI format,

wherein the first specific DCI format is DCI format 0B or 4B,

wherein the second specific DCI format is DCI format 0A or 4A, and

wherein the MCS field value is 29.