# US 10,484,223 B2 · Systems and methods for phase noise tracking reference signal sequence generation using demodulation reference signals > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,223 B2 - Document ID: US10484223B2 - Status: Granted - Kind: B2 - Application number: 16/210,261 - Filed: 2018-12-05 - Published: 2019-04-11 - Granted: 2019-11-19 - Earliest claimed: 2016-02-09 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Martin Hessler; Robert Baldemair; Lars Lindbom; Henrik Sahlin; Niclas Wiberg - Web page: https://patentgrep.com/patent/US10484223B2 ## CPC - H04L 27/2613: {Structure of the reference signals} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 27/2332: {using a non-coherent carrier} - H04L 27/2607: {Cyclic extensions} - H04L 27/2675: {Pilot or known symbols} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A user equipment (910) is provided for use in a cellular network. The user equipment includes a transceiver (1010), a processor (1020), and a memory (1030). The user equipment (910) is configured to determine, for a data transmission, a mapping form a demodulation reference signal (DMRS) to a PNT-RS. A DMRS resulting signal is generated from a subset of DMRS for a first resource element in a subcarrier. The DMRS resulting signal is copied from the first resource element to a second resource element assigned to the PNT-RS in the subcarrier. The data transmission is transmitted using the DMRS resulting signal and the PNT-RS. ## Claims ### Claim 1 A method by a user equipment in a cellular network for transmitting a phase noise tracking reference signal (PNT-RS) together with a data transmission, the method comprising: using a demodulation reference signal (DMRS) of a first resource element in a subcarrier for generating the PNT-RS in a second resource element of the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing (OFDM) symbol, and wherein the first resource element is the resource element intersecting the subcarrier assigned to the PNT-RS and the OFDM symbol assigned to the DMRS; and transmitting the data transmission, the DMRS and the PNT-RS to the network. ### Claim 2 (depends on 1) The method of claim 1, wherein the first resource element is associated with a first OFDM symbol and the second resource element, is associated with a second OFDM symbol. ### Claim 3 (depends on 1) The method according to claim 1, wherein the DMRS is a complex value and wherein the complex value of the first resource element is used to generate the PNT-RS in each OFDM symbol of the subcarrier assigned to the PNT-RS. ### Claim 4 (depends on 1) The method of claim 1, wherein the generated PNT-RS is continuous in all OFDM symbols of the subcarrier. ### Claim 5 (depends on 1) The method of claim 1, wherein the PNT-RS is generated by copying the DMRS. ### Claim 6 A method by a wireless transmitter in a cellular network for transmitting a phase noise tracking reference signal (PNT-RS) together with a data transmission, the method comprising: using a demodulation reference signal (DMRS) of a first resource element in a subcarrier for generating the PNT-RS in a second resource element of the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing (OFDM) symbol, and wherein the first resource element is the resource clement intersecting, the subcarrier assigned to the PNT-RS and the OFDM symbol assigned to the DMRS; and transmitting the data transmission, the DMRS and the PNT-RS to a wireless receiver. ### Claim 7 A method by a network node in a cellular network for transmitting a phase noise tracking reference signal (PNT-RS) together with a data transmission, the method comprising: using a demodulation reference signal (DMRS) of a first resource element in a subcarrier for generating the PNT-RS in a second resource element of the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing (OFDM) symbol, and wherein the first resource element is the resource element intersecting the subcarrier assigned to the PNT-RS and the OFDM symbol assigned to the DMRS; and transmitting the data transmission, the DMRS and the PNT-RS to a user equipment. ### Claim 8 A user equipment in a cellular network for transmitting a phase noise tracking reference signal (PNT-RS) together with a data transmission, the user equipment comprising a transceiver, a memory, and a processor, the user equipment configured to: use a demodulation reference signal (DMRS) of a first resource element in a subcarrier for generating the PNT-RS in a second resource element of the subcarrier, wherein the DMRS is assigned to an orthogonal frequency division multiplexing (OFDM) symbol, and, wherein the first resource element is the resource element intersecting the subcarrier assigned to the PNT-RS and the OFDM symbol assigned to the DMRS; and transmit the data transmission, the DMRS and the PNT-RS to the network. ### Claim 9 (depends on 8) The user equipment of claim 8, wherein the first resource element is associated with a first OFDM symbol and the second resource element is associated with a second OFDM symbol. ### Claim 10 (depends on 8) The user equipment according to claim 8, wherein the DMRS is a complex value and wherein the user equipment is configured to use the complex value of the first resource element to generate the PNT-RS in each OFDM symbol of the subcarrier assigned to the PNT-RS. ### Claim 11 (depends on 8) The user equipment of claim 8, wherein the generated PNT-RS is continuous in all OFDM symbols of the subcarrier. ### Claim 12 (depends on 8) The user equipment of claim 8, wherein the user equipment is configured to generate the PNT-RS by copying the DMRS.