METHOD OF FAST-RETRANSMITTING UPLINK DATA IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

• US 20180049234A1
• Filed: 09/25/2015
• Published: 02/15/2018
• Est. Priority Date: 03/16/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Eunjong, CHO, Heejeong, HAHN, Genebeck, BYUN, Ilmu
• Granted Patent: US 10,375,725 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1822 involving configuration of automatic repeat request [ARQ] with parallel processes
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present application relates to a method performed by a terminal for transmitting uplink data (UL data) in a wireless communication system supporting a low latency service, the method comprising the steps of: receiving a UL grant for transmitting initial data from a base station; transmitting the initial data to the base station on the basis of the received UL grant; receiving, from the base station, non-acknowledgement (NACK) for the transmission of the initial data and a simple UL grant comprising resource information related to the retransmission of the initial data; and performing the retransmission of the initial data on the basis of the received simple UL grant.

Claims

1. A method for transmitting uplink (UL) data performed by a user equipment (UE) in a wireless communication system that supports a low latency system, comprising:

receiving a UL grant for an initial data transmission from a base station;

transmitting the initial data to the base station based on the received UL grant;

receiving a negative acknowledgement (NACK) for the initial data transmission and a simple UL grant including resource information in relation to a retransmission of the initial data from the base station; and

performing the retransmission of the initial data based on the received simple UL grant,

wherein the simple UL grant includes at least one of a subframe offset (SF_offset) field representing a subframe (SF) offset from a subframe (SF) on which the base station transmits the simple UL grant, a HARQ process ID (HARQ PID) field representing a HARQ process ID that corresponds to retransmission data or a RBSTART field representing an index of a resource allocation start resource of the retransmission data.

2. The method of claim 1, wherein the simple UL grant further includes a redundancy version (RV) field representing a version of redundancy in HARQ of incremental redundancy scheme.

3. The method of claim 1, wherein the NACK is received through a Physical Hybrid-ARQ Indicator Channel (PHICH), and

wherein the simple UL grant is received through a Physical Downlink Control Channel (PDCCH).

4. The method of claim 1, wherein the UL grant is the simple UL grant when the initial data is data having a fixed size.

5. The method of claim 4, further comprising transmitting control information representing whether the initial data is general data or data of a fixed size to the base station.

6. The method of claim 5, wherein the control information is transmitted to the base station through a scheduling request (SR).

7. A method for transmitting uplink (UL) data performed by a base station in a wireless communication system that supports a low latency system, comprising:

transmitting a UL grant for an initial data transmission of a user equipment (UE) to the UE;

receiving the initial data to the UE;

transmitting a simple UL grant including a negative acknowledgement (NACK) and resource information in relation to a retransmission of the initial data to the UE, when decoding of the received initial data is failed; and

receiving retransmission data for the initial data from the UE based on the simple UL grant,

wherein the simple UL grant includes at least one of a subframe offset (SF_offset) field representing a subframe (SF) offset from a subframe (SF) for transmitting the simple UL grant to the UE, a HARQ process ID (HARQ PID) field representing a HARQ process ID that corresponds to the retransmission data or a RBSTART field representing an index of a resource allocation start resource of the retransmission data.

8. The method of claim 7, wherein the simple UL grant further includes a redundancy version (RV) field representing a version of redundancy in HARQ of incremental redundancy scheme.

9. The method of claim 7, wherein the NACK is received through a Physical Hybrid-ARQ Indicator Channel (PHICH), and

wherein the simple UL grant is received through a Physical Downlink Control Channel (PDCCH).

10. The method of claim 7, wherein the UL grant is the simple UL grant when the initial data is data having a fixed size.

11. The method of claim 10, further comprising transmitting control information representing whether the initial data is general data or data of a fixed size to the base station.

12. The method of claim 11, wherein the control information is transmitted to the base station through a scheduling request (SR).

13. A user equipment (UE) transmitting uplink (UL) data in a wireless communication system that supports a low latency system, comprising:

a radio frequency (RF) unit for transmitting and receiving a radio signal; and

a processor functionally connected to the RF unit,

wherein the processor is configured to perform;

receiving a UL grant for an initial data transmission from a base station;

transmitting the initial data to the base station based on the received UL grant;

receiving a negative acknowledgement (NACK) for the initial data transmission and a simple UL grant including resource information in relation to a retransmission of the initial data from the base station; and

performing the retransmission of the initial data based on the received simple UL grant,

wherein the simple UL grant includes at least one of a subframe offset (SF_offset) field representing a subframe (SF) offset from a subframe (SF) on which the base station transmits the simple UL grant, a HARQ process ID (HARQ PID) field representing a HARQ process ID that corresponds to retransmission data or a RBSTART field representing an index of a resource allocation start resource of the retransmission data.