Method of fast-retransmitting uplink data in wireless communication system and apparatus therefor

• US 10,375,725 B2
• Filed: 09/25/2015
• Issued: 08/06/2019
• 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
• Primary Examiner(s): Hailu, Kibrom T
• Application Number:
  US15/549,652
• Publication Number:
  US 20180049234A1
• Time in Patent Office: 1,411 Days
• Field of Search: None
• 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, by a user equipment (UE), uplink (UL) data in a wireless communication system that supports a low latency system, the method comprising:

receiving, from a base station, a first UL grant for initial data

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

generating a transport block related to a retransmission of the initial data;

receiving, from the base station, a negative acknowledgement (NACK) for the initial data and a second UL grant,

wherein the second UL grant includes a position of a physical resource for the transport block;

mapping the transport block to the position of the physical resource based on the second UL grant; and

transmitting, to the base station, the transport block on the physical resource.

2. The method of claim 1,

wherein the second UL grant further includes at least one of a subframe offset (SF_offset) field representing a subframe (SF) offset from a SF on which the base station transmits the second UL grant, a hybrid automatic repeat request (HARQ) process ID (HARQ PID) field representing a HARQ process ID that corresponds to retransmission data, a RBSTART field representing an index of a resource allocation start resource of the transport block or 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 second UL grant is received through a Physical Downlink Control Channel (PDCCH).

4. The method of claim 1, wherein when the initial data is data having a fixed size, a first format of the first UL grant is same as a second format of the second UL grant.

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

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, by a base station, uplink (UL) data in a wireless communication system that supports a low latency system, the method comprising:

transmitting, to a user equipment (UE), a first UL grant for initial data;

receiving, from the UE, the initial data;

transmitting, to the UE, a second UL grant and a negative acknowledgement (NACK), when decoding of the received initial data is failed,

wherein the second UL grant includes a position of a physical resource for a transport block related to a retransmission of the initial data; and

receiving, from the UE, the transport block on the physical resource.

8. The method of claim 7, wherein the second UL grant further includes at least one of a subframe offset (SF_offset) field representing a subframe (SF) offset from a SF for transmitting the second UL grant to the UE, a hybrid automatic repeat request (HARQ) process ID (HARQ PID) field representing a HARQ process ID that corresponds to retransmission data, a RBSTART field representing an index of a resource allocation start resource of the transport block or 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 transmitted through a Physical Hybrid-ARQ Indicator Channel (PHICH), and

wherein the second UL grant is transmitted through a Physical Downlink Control Channel (PDCCH).

10. The method of claim 7, wherein when the initial data is data having a fixed size, a first format of the first UL grant is same as a second format of the second UL grant.

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

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, the UE 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, from a base station, a first UL grant for initial data;

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

generating a transport block related to a retransmission of the initial data;

receiving, from the base station, a negative acknowledgement (NACK) for the initial data and a second UL grant,

wherein the second UL grant includes a position of a physical resource for the transport block;

mapping the transport block to the position of the physical resource based on the second UL grant; and

transmitting, to the base station, the transport block on the physical resource.