# US 2019/0174527 A1 · Method and apparatus for uplink transmission and reception in a wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174527 A1 - Document ID: US20190174527A1 - Status: Published application - Kind: A1 - Application number: 16/207,992 - Filed: 2018-12-03 - Published: 2019-06-06 - Earliest claimed: 2017-12-01 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jonghyun Park; Kilbom Lee - Web page: https://patentgrep.com/patent/US20190174527A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04B 7/0404: the mobile station comprising multiple antennas, e.g. to provide uplink diversity - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - 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)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 25/02: Details {; arrangements for supplying electrical power along data transmission lines (systems for transmitting signals via power distribution lines H04B3/54)} - H04L 25/0224: {using sounding signals} - H04L 25/03343: {Arrangements at the transmitter end} - H04L 27/2602: {Signal structure} - H04L 5/0023: {Time-frequency-space} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0057: {Physical resource allocation for CQI} - H04W 72/1268: of uplink data flows - H04W 88/02: Terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract An uplink transmission and reception method and a device for the same in a wireless communication system are disclosed. More specifically, a method for performing an uplink transmission in a wireless communication system by a user equipment includes receiving, from a base station, downlink control information (DCI) for scheduling of an uplink shared channel; and performing the uplink transmission via the uplink shared channel based on the DCI, wherein the DCI includes a sounding reference signal resource indication (SRS resource indication, SRI) field carrying a SRI and a demodulation reference signal (DMRS) related field, wherein a number of layers for the uplink transmission is determined based on the SRI field, wherein a size of the DMRS related field is equally configured for each of candidates of the number of layers. ## Claims ### Claim 1 A method for performing an uplink transmission in a wireless communication system by a user equipment (UE), the method comprising: receiving, from a base station, downlink control information (DCI) for a scheduling of an uplink shared channel; and performing the uplink transmission via the uplink shared channel based on the DCI, wherein the DCI includes a sounding reference signal resource indication (SRS resource indication, SRI) field carrying a SRI and a demodulation reference signal (DMRS) related field, wherein a number of layers for the uplink transmission is determined based on the SRI field, wherein a size of the DMRS related field is equally configured for each of candidates of the number of layers. ### Claim 2 (depends on 1) The method of claim 1, wherein the DMRS related field is a field configured for a port configuration of the DMRS. ### Claim 3 (depends on 2) The method of claim 2, wherein the size of the DMRS related field is determined based on a specific candidate, in which a number of DMRS states is configured to the maximum, among the candidates. ### Claim 4 (depends on 3) The method of claim 3, wherein the size of the DMRS related field is configured with a minimum bitwidth for representing a number of DMRS states for the specific candidate. ### Claim 5 (depends on 3) The method of claim 3, wherein the uplink transmission is performed based on a non-codebook. ### Claim 6 (depends on 3) The method of claim 3, wherein a bitwidth of the SRI field is determined based on a number of SRS resources in a SRS resource set configured to the UE and a maximum number of layers supported for the uplink transmission. ### Claim 7 (depends on 6) The method of claim 6, wherein the bitwidth of the SRI field is determined according to the following Equation, ceil(log2(S_tot)) [Equation] where ceil(x) is a function outputting a minimum integer not less than x, S tot = ∑ k = 1 L max  ( N k ) , N is the number of SRS resources in the SRS resource set configured to the UE, and L_max is the maximum number of layers supported for the uplink transmission. ### Claim 8 A method for performing an uplink reception in a wireless communication system by a base station, the method comprising: transmitting, to a user equipment (UE), downlink control information (DCI) for a scheduling of an uplink shared channel; and performing the uplink reception via the uplink shared channel based on the DCI, wherein the DCI includes a sounding reference signal resource indication (SRS resource indication, SRI) field carrying a SRI and a demodulation reference signal (DMRS) related field, wherein a number of layers for the uplink transmission is determined based on the SRI field, wherein a size of the DMRS related field is equally configured for each of candidates of the number of layers. ### Claim 9 (depends on 8) The method of claim 8, wherein the DMRS related field is a field configured for a port configuration of the DMRS. ### Claim 10 (depends on 9) The method of claim 9, wherein the size of the DMRS related field is determined based on a specific candidate, in which a number of DMRS states is configured to the maximum, among the candidates. ### Claim 11 (depends on 10) The method of claim 10, wherein the size of the DMRS related field is configured with a minimum bitwidth for representing a number of DMRS states for the specific candidate. ### Claim 12 (depends on 10) The method of claim 10, wherein the uplink reception is performed based on a non-codebook. ### Claim 13 (depends on 10) The method of claim 10, wherein a bitwidth of the SRI field is determined based on a number of SRS resources in a SRS resource set configured to the UE and a maximum number of layers supported for the uplink reception. ### Claim 14 (depends on 13) The method of claim 13, wherein the bitwidth of the SRI field is determined according to the following Equation, ceil(log2(S_tot)) [Equation] where ceil(x) is a function outputting a minimum integer not less than x, S tot = ∑ k = 1 L max  ( N k ) , N is the number of SRS resources in the SRS resource set configured to the UE, and L_max is the maximum number of layers supported for the uplink transmission. ### Claim 15 A user equipment (UE) performing an uplink transmission in a wireless communication system, the UE comprising: a radio frequency (RF) unit configured to transmit and receive a radio signal; and a processor configured to control the RF unit, wherein the processor is configured to: receive, from a base station, downlink control information (DCI) for a scheduling of an uplink shared channel; and perform the uplink transmission via the uplink shared channel based on the DCI, wherein the DCI includes a sounding reference signal resource indication (SRS resource indication, SRI) field carrying a SRI and a demodulation reference signal (DMRS) related field, wherein a number of layers for the uplink transmission is determined based on the SRI field, wherein a size of the DMRS related field is equally configured for each of candidates of the number of layers.