# US 10,375,725 B2 · Method of fast-retransmitting uplink data in wireless communication system and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,725 B2 - Document ID: US10375725B2 - Status: Granted - Kind: B2 - Application number: 15/549,652 - Filed: 2015-09-25 - Published: 2018-02-15 - Granted: 2019-08-06 - Earliest claimed: 2015-03-16 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Eunjong Lee; Heejeong Cho; Genebeck Hahn; Ilmu Byun - Web page: https://patentgrep.com/patent/US10375725B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 1/1819: {with retransmission of additional or different redundancy} - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04W 28/04: Error control - H04W 72/1268: of uplink data flows - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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 ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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). ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 4) 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. ### Claim 6 (depends on 5) The method of claim 5, wherein the control information is transmitted to the base station through a scheduling request (SR). ### Claim 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. ### Claim 8 (depends on 7) 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. ### Claim 9 (depends on 7) 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). ### Claim 10 (depends on 7) 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. ### Claim 11 (depends on 10) The method of claim 10, further comprising receiving control information representing whether the initial data is general data or data of a fixed size. ### Claim 12 (depends on 11) The method of claim 11, wherein the control information is transmitted to the base station through a scheduling request (SR). ### Claim 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.