# US 2020/0403669 A1 · Uplink transmission/reception method in wireless communication system and device therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0403669 A1 - Document ID: US20200403669A1 - Status: Published application - Kind: A1 - Application number: 17/015,312 - Filed: 2020-09-09 - Published: 2020-12-24 - Earliest claimed: 2016-09-26 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jonghyun PARK; Jiwon KANG; Kijun KIM; Haewook PARK - Web page: https://patentgrep.com/patent/US20200403669A1 ## CPC - H04B 7/0486: {taking channel rank into account} - 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 - H04B 7/06: at the transmitting station - H04B 7/0617: {for beam forming} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B 7/065: {Variable contents, e.g. long-term or short-short} - 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 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 25/0226: {sounding signals per se} - H04L 27/2607: {Cyclic extensions} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/563: of the wireless resources - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - Y02D 30/70: in wireless communication networks - H04B: TRANSMISSION - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Disclosed is a method for uplink transmission and reception in a wireless communication system and an apparatus therefor. Specifically, a method for performing uplink transmission by a user equipment (UE) in a wireless communication system may comprise the steps of: receiving downlink control information (DCI) including sounding reference signal (SRS) resource indication (SRI) and precoding indication from a base station; and transmitting an uplink to the base station by applying precoding indicated by the precoding indication on an antenna port of an SRS transmitted within an SRS resource selected by the SRI. ## Claims ### Claim 1 A method of performing uplink transmission by a user equipment (UE) in a wireless communication system, the method comprising: performing a plurality of sounding reference signal (SRS) transmissions, to a base station, on a plurality of SRS resources configured for the UE; receiving, from the base station, a transmission grant for the UE to perform the uplink transmission, wherein the transmission grant includes an SRS resource indication (SRI) that indicates an SRS resource among the plurality of SRS resources on which the plurality of SRS transmissions were performed by the UE; determining a precoding for the uplink transmission based at least on the SRS resource indicated by the SRI in the transmission grant; and performing the uplink transmission to the base station by applying the precoding that was determined based at least on the SRS resource indicated by the SRI in the transmission grant. ### Claim 2 (depends on 1) The method of claim 1, wherein, for the uplink transmission, at least one of (i) an uplink beamforming vector or (ii) an uplink beamforming coefficient is configured through control channel signaling by the base station or is determined by the UE. ### Claim 3 (depends on 2) The method of claim 2, wherein the at least one of the uplink beamforming vector or the uplink beamforming coefficient is determined based on at least one of a downlink beamforming vector or a downlink beamforming coefficient used for reception of a downlink reference signal (DL RS) from the base station. ### Claim 4 (depends on 3) The method of claim 3, wherein the DL RS is a channel state information reference signal (CSI-RS), and wherein a CSI-RS resource used for determining the at least one of the uplink beamforming vector or the uplink beamforming coefficient is indicated by the base station. ### Claim 5 (depends on 1) The method of claim 1, wherein at least one of an uplink beamforming vector or an uplink beamforming coefficient is independently applied for each subband for the uplink transmission. ### Claim 6 (depends on 5) The method of claim 5, wherein the at least one of the uplink beamforming vector or the uplink beamforming coefficient applied for the uplink transmission for each subband is determined based on at least one of a downlink beamforming vector or a downlink beamforming coefficient used for reception of a downlink reference signal (DL RS) from the base station. ### Claim 7 (depends on 6) The method of claim 6, wherein the DL RS is a channel state information reference signal (CSI-RS), and wherein a CSI-RS resource used for determining the at least one of the uplink beamforming vector or the downlink beamforming coefficient is indicated by the base station. ### Claim 8 (depends on 1) The method of claim 1, wherein the transmission grant further includes a rank indication for the uplink transmission. ### Claim 9 (depends on 1) The method of claim 1, wherein a number of ranks for the uplink transmission is determined as a number of antenna ports of an SRS transmission that was performed on the SRS resource indicated by the SRI. ### Claim 10 (depends on 1) The method of claim 1, wherein the precoding for the uplink transmission is determined further based on a precoding indication that is included in the transmission grant, wherein the precoding indication comprises a first precoding indication and a second precoding indication, and wherein the second precoding indication is jointly encoded with uplink resource allocation information scheduled to the UE. ### Claim 11 (depends on 10) The method of claim 10, wherein the precoding indication indicates the precoding that corresponds to an antenna port of the SRS resource that is indicated by the SRI. ### Claim 12 (depends on 10) The method of claim 10, wherein receiving the precoding indication that indicates the precoding that corresponds to the SRS resource indicated by the SRI comprises: receiving, from the base station, a transmitted precoding matrix indicator (TPMI). ### Claim 13 (depends on 1) The method of claim 1, wherein determining the precoding for the uplink transmission based on the SRS resource indicated by the SRI comprises: based on the SRI indicating a first SRS resource: determining the precoding as a first precoding that corresponds to the first SRS resource; and based on the SRI indicating a second SRS resource: determining the precoding as a second precoding that corresponds to the second SRS resource. ### Claim 14 (depends on 1) The method of claim 1, wherein determining the precoding for the uplink transmission comprises: determining a plurality of precoding coefficients for the uplink transmission, and wherein performing the uplink transmission to the base station by applying the precoding comprises: performing the uplink transmission to the base station by applying the plurality of precoding coefficients to antenna ports that are identical to antenna ports of an SRS transmission that was performed on the SRS resource indicated by the SRI. ### Claim 15 (depends on 1) The method of claim 1, wherein the transmission grant is received from the base station through Downlink Control Information (DCI). ### Claim 16 (depends on 1) The method of claim 1, wherein the transmission grant is received from the base station through Radio Resource Control (RRC) signaling. ### Claim 17 (depends on 1) The method of claim 1, wherein applying the precoding that corresponds to the SRS resource indicated by the SRI comprises: encoding, using the precoding, information that is to be communicated to the base station. ### Claim 18 A user equipment (UE) configured to perform uplink transmission in a wireless communication system, the UE comprising: a radio frequency (RF) unit; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing computer instructions that, when executed, cause the at least one processor to perform operations comprising: performing a plurality of sounding reference signal (SRS) transmissions, to a base station, on a plurality of SRS resources configured for the UE; receiving, from the base station through the RF unit, a transmission grant for the UE to perform the uplink transmission, wherein the transmission grant includes an SRS resource indication (SRI) that indicates an SRS resource among the plurality of SRS resources on which the plurality of SRS transmissions were performed by the UE; determining a precoding for the uplink transmission based at least on the SRS resource indicated by the SRI in the transmission grant; and performing the uplink transmission through the RF unit to the base station by applying the precoding that was determined based at least on the SRS resource indicated by the SRI in the transmission grant. ### Claim 19 A method of receiving, by a base station, an uplink transmission from a user equipment (UE) in a wireless communication system, the method comprising: receiving, from the UE, a plurality of sounding reference signal (SRS) transmissions on a plurality of SRS resources configured for the UE; transmitting, to the UE, a transmission grant for the UE to perform the uplink transmission, wherein the transmission grant includes an SRS resource indication (SRI) that indicates an SRS resource among the plurality of SRS resources on which the plurality of SRS transmissions were received from the UE; and receiving, from the UE, the uplink transmission that has been precoded by the UE with a precoding that is based at least on the SRS resource indicated by the SRI in the transmission grant. ### Claim 20 A base station configured to receive an uplink transmission from a user equipment (UE) in a wireless communication system, the base station comprising: a radio frequency (RF) unit; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing computer instructions that, when executed, cause the at least one processor to perform operations comprising: receiving, from the UE through the RF unit, a plurality of sounding reference signal (SRS) transmissions on a plurality of SRS resources configured for the UE; transmitting, to the UE through the RF unit, a transmission grant for the UE to perform the uplink transmission, wherein the transmission grant includes an SRS resource indication (SRI) that indicates an SRS resource among the plurality of SRS resources on which the plurality of SRS transmissions were received from the UE; and receiving, from the UE through the RF unit, the uplink transmission that has been precoded by the UE with a precoding that is based at least on the SRS resource indicated by the SRI in the transmission grant.