# US 11,121,836 B2 · Method for transmitting and receiving data in wireless communication system and device for same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,836 B2 - Document ID: US11121836B2 - Status: Granted - Kind: B2 - Application number: 16/477,816 - Filed: 2018-01-08 - Published: 2020-04-23 - Granted: 2021-09-14 - Earliest claimed: 2017-01-12 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kyuhwan Kwak; Daesung Hwang; Hyunho Lee; Yunjung Yi; Seonwook Kim - Web page: https://patentgrep.com/patent/US11121836B2 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 72/1273: of downlink data flows - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Disclosed are a method for transmitting and receiving data in a wireless communication system and a device therefor. Specifically, a method for transmitting and receiving, by a user equipment, data in a wireless communication system supporting a short transmission time interval (TTI) may include: receiving, through at least one of a physical downlink control channel (PDCCH) depending on a radio frame structure based on a first TTI or a short PDCCH (sPDCCH) based on a second TTI, downlink control information related to the second TTI, wherein the number of symbols corresponding to the second TTI is smaller than the number of symbols corresponding to the first TTI; and receiving downlink data related to the second TTI through a short physical downlink shared channel (sPDSCH) depending on the radio frame structure based on the second TTI by using the downlink control information. ## Claims ### Claim 1 A method of transmitting and receiving, by a user equipment, data in a wireless communication system supporting a short transmission time interval (TTI), the method comprising: receiving, through (i) a physical downlink control channel (PDCCH) depending on a radio frame structure based on a first TTI and (ii) a short PDCCH (sPDCCH) based on a second TTI, downlink control information related to the second TTI, wherein the number of symbols corresponding to the second TTI is smaller than the number of symbols corresponding to the first TTI, and wherein (i) a first part of the downlink control information related to the second TTI is received through the PDCCH, and (ii) a second part of the downlink control information related to the second TTI is received through the sPDCCH; and receiving downlink data related to the second TTI through a short physical downlink shared channel (sPDSCH) depending on the radio frame structure based on the second TTI by using the downlink control information, wherein the sPDCCH includes a control channel element corresponding to one or more resource element groups, and wherein the number of one or more resource element groups is configured according to the number of symbols corresponding to the second TTI. ### Claim 2 (depends on 1) The method of claim 1, wherein the one or more resource element groups are disposed over at least one symbol corresponding to the second TTI. ### Claim 3 (depends on 2) The method of claim 2, wherein the one or more resource element groups are frequency division multiplexed and assigned in units of the number of symbols corresponding to the second TTI. ### Claim 4 (depends on 1) The method of claim 1, wherein a symbol length on a time domain of the control channel element is configured to be equal to a symbol length corresponding to the second TTI. ### Claim 5 (depends on 1) The method of claim 1, wherein the one or more resource element groups are mapped an increasing order of an index on the time domain and then, mapped in the increasing order of the index on a frequency domain. ### Claim 6 (depends on 1) The method of claim 1, wherein when the number of symbols corresponding to the second TTI is 2, the number of one or more resource element groups is configured to 4. ### Claim 7 (depends on 1) The method of claim 1, wherein the number of one or more resource element groups is configured to a specific number of times of the number of symbols corresponding to the second TTI. ### Claim 8 (depends on 1) The method of claim 1, wherein the downlink control information related to the second TTI is scheduling multiple short TTIs. ### Claim 9 (depends on 8) The method of claim 8, wherein, based on acknowledgement or negative acknowledgement for sPDSCH being transmitted through a short physical uplink control channel (sPUCCH), a resource of the sPUCCH is linked to an index of a short control channel element that the downlink control information related to the second TTI is transmitted or is configured through an acknowledgement resource indicator (ARI) information included in the downlink control information related to the second TTI. ### Claim 10 (depends on 1) The method of claim 1, wherein based on the sPDCCH being received based on a cell-specific reference signal, the one or more resource element groups are assigned to a specific symbol of at least one symbol corresponding to the second TTI. ### Claim 11 (depends on 10) The method of claim 10, wherein the one or more resource element groups are interleaved in the specific symbol. ### Claim 12 (depends on 1) The method of claim 1, wherein the first TTI is a TTI corresponding to 14 symbols, and wherein the second TTI is a TTI corresponding to any one of two symbols or three symbols. ### Claim 13 A user equipment (UE) configured to transmit and receive data in a wireless communication system supporting a short transmission time interval (TTI), the UE comprising: a transceiver; and at least one processor functionally connected to the transceiver, wherein the at least one processor is configured to control the UE to: receive, through (i) a physical downlink control channel (PDCCH) depending on a radio frame structure based on a first TTI and (ii) a short PDCCH (sPDCCH) based on a second TTI, downlink control information related to the second TTI, wherein the number of symbols corresponding to the second TTI is smaller than the number of symbols corresponding to the first TTI, and wherein (i) a first part of the downlink control information related to the second TTI is received through the PDCCH, and (ii) a second part of the downlink control information related to the second TTI is received through the sPDCCH, and receive downlink data related to the second TTI through a short physical downlink shared channel (sPDSCH) depending on the radio frame structure based on the second TTI by using the downlink control information, wherein the sPDCCH includes a control channel element corresponding to one or more resource element groups, and wherein the number of one or more resource element groups is configured according to the number of symbols corresponding to the second TTI.