# US 2020/0287751 A1 · Signal transmission method for estimating phase noise in 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 2020/0287751 A1 - Document ID: US20200287751A1 - Status: Published application - Kind: A1 - Application number: 16/064,983 - Filed: 2017-06-02 - Published: 2020-09-10 - Earliest claimed: 2016-06-05 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kilbom LEE; Jaehoon CHUNG; Kyuseok KIM; Minki AHN - Web page: https://patentgrep.com/patent/US20200287751A1 ## CPC - H04L 25/0226: {sounding signals per se} - 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 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04L 25/0204: {of multiple channels} - H04L 27/2602: {Signal structure} - H04L 27/2675: {Pilot or known symbols} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/2657: {Carrier synchronisation} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Disclosed are a signal transmission method and a base station, the signal transmission method comprising: generating a PTRS used for estimating phase noise in a downlink signal; transmitting, to a terminal, at least one form among information indicating whether the PTRS is transmitted by means of downlink signaling, and information indicating an antenna port of the PTRS; and transmitting the PTRS to the terminal in accordance with the information transmitted thereto. ## Claims ### Claim at position 1 1-12. (canceled) ### Claim 13 A method of transmitting, by a communication device, a signal for estimating phase noise for a downlink channel in a wireless communication system, the method comprising: generating, a phase noise reference signal (PNRS); generating, a demodulation reference signal (DMRS); informing, to a user equipment, a transmission of the PNRS via a radio resource control (RRC) signaling; mapping, the PNRS to first resource elements (REs) within a group of REs that is utilized for downlink data transmission such that: (i) based on the PNRS and the DMRS using a same antenna port, and based on the DMRS being mapped in a frequency domain to a plurality of subcarriers within the group of REs: the first REs to which the PNRS is mapped are all associated with a single subcarrier among the plurality of subcarriers within the group of REs, and (ii) based on the PNRS and the DMRS using the same antenna port, and based on the DMRS being mapped in a time domain to an orthogonal frequency division multiplexing (OFDM) symbol within the group of REs: the first REs to which the PNRS is mapped are all associated with a plurality of OFDM symbols that occur after the OFDM symbol to which the DMRS is mapped within the group of REs, wherein each OFDM symbol in the plurality of OFDM symbols of the first REs is spaced apart by one or more OFDM symbol durations; and transmitting, to the user equipment, (i) the PNRS mapped to the first REs, and (ii) the DMRS. ### Claim 14 (depends on 13) The method of claim 13, wherein the group of REs comprises 12 subcarriers and 14 OFDM symbols. ### Claim 15 (depends on 13) The method of claim 13, wherein transmitting the DMRS comprises: transmitting the DMRS that is (i) mapped in the frequency domain to the plurality of subcarriers within the group of REs, and (ii) mapped in the time domain to the OFDM symbol within the group of REs. ### Claim 16 (depends on 13) The method of claim 13, wherein the single subcarrier, among the plurality of subcarriers, is associated with the first REs based on an antenna port used by the DMRS. ### Claim 17 (depends on 13) The method of claim 13, wherein each OFDM symbol in the plurality of OFDM symbols of the first REs is spaced apart by 2 OFDM symbol durations or by 4 OFDM symbol durations. ### Claim 18 (depends on 13) The method of claim 13, wherein the plurality of OFDM symbols that are associated with the first REs to which the PNRS is mapped is determined based on a mapping position of a downlink control channel or a channel state information reference signal (CSI-RS). ### Claim 19 (depends on 18) The method of claim 18, wherein the plurality of OFDM symbols that are associated with the first REs to which the PNRS is mapped excludes the mapping position of the downlink control channel. ### Claim 20 (depends on 18) The method of claim 18, wherein the plurality of OFDM symbols that are associated with the first REs to which the PNRS is mapped excludes the mapping position of the CSI-RS. ### Claim 21 A communication device configured to transmit a signal for estimating phase noise for a downlink channel in a wireless communication system, the communication device comprising: at least one radio frequency (RF) module; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: generating a phase noise reference signal (PNRS); generating a demodulation reference signal (DMRS); informing a transmission of the PNRS via a radio resource control (RRC) signaling; mapping the PNRS to first resource elements (REs) within a group of REs that is utilized for downlink data transmission such that: (i) based on the PNRS and the DMRS using a same antenna port, and based on the DMRS being mapped in a frequency domain to a plurality of subcarriers within the group of REs: the first REs to which the PNRS is mapped are all associated with a single subcarrier among the plurality of subcarriers within the group of REs, and (ii) based on the PNRS and the DMRS using the same antenna port, and based on the DMRS being mapped in a time domain to an orthogonal frequency division multiplexing (OFDM) symbol within the group of REs: the first REs to which the PNRS is mapped are all associated with a plurality of OFDM symbols that occur after the OFDM symbol to which the DMRS is mapped within the group of REs, wherein each OFDM symbol in the plurality of OFDM symbols of the first REs is spaced apart by one or more OFDM symbol durations; and transmitting, to a user equipment, (i) the PNRS mapped to the first REs, and (ii) the DMRS. ### Claim 22 (depends on 21) The communication device of claim 21, wherein the group of REs comprises 12 subcarriers and 14 OFDM symbols. ### Claim 23 (depends on 21) The communication device of claim 21, wherein transmitting the DMRS comprises: transmitting the DMRS that is (i) mapped in the frequency domain to the plurality of subcarriers within the group of REs, and (ii) mapped in the time domain to the OFDM symbol within the group of REs. ### Claim 24 (depends on 21) The communication device of claim 21, wherein the single subcarrier, among the plurality of subcarriers, is associated with the first REs based on an antenna port used by the DMRS. ### Claim 25 (depends on 21) The communication device of claim 21, wherein each OFDM symbol in the plurality of OFDM symbols of the first REs is spaced apart by 2 OFDM symbol durations or by 4 OFDM symbol durations. ### Claim 26 (depends on 21) The communication device of claim 21, wherein the plurality of OFDM symbols that are associated with the first REs to which the PNRS is mapped is determined based on a mapping position of a downlink control channel or a channel state information reference signal (CSI-RS). ### Claim 27 (depends on 26) The communication device of claim 26, wherein the plurality of OFDM symbols that are associated with the first REs to which the PNRS is mapped excludes the mapping position of the downlink control channel. ### Claim 28 (depends on 26) The communication device of claim 26, wherein the plurality of OFDM symbols that are associated with the first REs to which the PNRS is mapped excludes the mapping position of the CSI-RS. ### Claim 29 A method of receiving, by a user equipment (UE), a signal for estimating phase noise for a downlink channel in a wireless communication system, the method comprising: receiving, from a communication device in the wireless communication system, a demodulation reference signal (DMRS); based on a signal, received via a radio resource control (RRC) signaling, informing a transmission of the PNRS, receiving, from the communication device, a phase noise reference signal (PNRS) that is mapped to first resource elements (REs) within a group of REs that is utilized for downlink data transmission; and estimating the phase noise for the downlink channel based on the received PNRS, wherein based on the PNRS and the DMRS using a same antenna port, and based on the DMRS being mapped in a frequency domain to a plurality of subcarriers within the group of REs: the first REs to which the PNRS is mapped are all associated with a single subcarrier among the plurality of subcarriers within the group of REs, and wherein based on the PNRS and the DMRS using the same antenna port, and based on the DMRS being mapped in a time domain to an orthogonal frequency division multiplexing (OFDM) symbol within the group of REs: the first REs to which the PNRS is mapped are all associated with a plurality of OFDM symbols that occur after the OFDM symbol to which the DMRS is mapped within the group of REs, wherein each OFDM symbol in the plurality of OFDM symbols of the first REs is spaced apart by one or more OFDM symbol durations. ### Claim 30 (depends on 29) The method of claim 29, wherein receiving the DMRS comprises: receiving the DMRS that is (i) mapped in the frequency domain to the plurality of subcarriers within the group of REs, and (ii) mapped in the time domain to the OFDM symbol within the group of REs. ### Claim 31 A user equipment (UE) configured to receive a signal for estimating phase noise for a downlink channel in a wireless communication system, the UE comprising: at least one radio frequency (RF) module; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: receiving, from a communication device in the wireless communication system, a demodulation reference signal (DMRS); based on a signal, received via a radio resource control (RRC) signaling, informing a transmission of the PNRS, receiving, from the communication device, a phase noise reference signal (PNRS) that is mapped to first resource elements (REs) within a group of REs that is utilized for downlink data transmission; and estimating the phase noise for the downlink channel based on the received PNRS, wherein based on the PNRS and the DMRS using a same antenna port, and based on the DMRS being mapped in a frequency domain to a plurality of subcarriers within the group of REs: the first REs to which the PNRS is mapped are all associated with a single subcarrier among the plurality of subcarriers within the group of REs, and wherein based on the PNRS and the DMRS using the same antenna port, and based on the DMRS being mapped in a time domain to an orthogonal frequency division multiplexing (OFDM) symbol within the group of REs: the first REs to which the PNRS is mapped are all associated with a plurality of OFDM symbols that occur after the OFDM symbol to which the DMRS is mapped within the group of REs, wherein each OFDM symbol in the plurality of OFDM symbols of the first REs is spaced apart by one or more OFDM symbol durations. ### Claim 32 (depends on 31) The UE of claim 31, wherein receiving the DMRS comprises: receiving the DMRS that is (i) mapped in the frequency domain to the plurality of subcarriers within the group of REs, and (ii) mapped in the time domain to the OFDM symbol within the group of REs.