# US 2021/0242989 A1 · Non-coherent millimeter-wave communication techniques > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242989 A1 - Document ID: US20210242989A1 - Status: Published application - Kind: A1 - Application number: 16/777,667 - Filed: 2020-01-30 - Published: 2021-08-05 - Earliest claimed: 2020-01-30 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Michael Levitsky; Assaf Touboul; Ran Berliner; Gideon Shlomo Kutz; Shay Landis - Web page: https://patentgrep.com/patent/US20210242989A1 ## 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)} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 27/26136: {Pilot sequence conveying additional information} - 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 Wireless communication techniques that utilize a general purpose (GP) reference signal for non-coherent millimeter-wave communication are discussed. The GP reference signal may have a special structure allowing it to be flexibly used by a mobile device for multiple purposes. A base station may determine a repetition factor for a repetitive intra-symbol GP reference signal mapping based on an event that triggered transmission of the GP reference signal. The base station may also map the GP reference signal to resource elements of a symbol based, at least in part, on the determined repetition factor of the repetitive intra-symbol GP reference signal mapping. The base station may also transmit the mapped GP reference signal. A mobile device may receive the GP reference signal and modify at least one parameter of a plurality of parameters based, at least in part, on processing of the GP reference signal. ## Claims ### Claim 1 A method of wireless communication, comprising: receiving a reference signal mapped, within a symbol, to resource elements that are separated from each other based, at least in part, on a repetition factor; and modifying at least one parameter of a plurality of parameters based, at least in part, on processing of the reference signal. ### Claim 2 (depends on 1) The method of claim 1, further comprising: processing the reference signal by processing a time-domain representation of the reference signal in which a same time-domain reference signal pattern is present a number of times within a time period, wherein the time period is equal to a time period of the symbol, and wherein the number of times the time-domain reference signal pattern is present within the time period is a function of the repetition factor. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving a number of symbols on which the reference signal is further mapped; and processing the received number of symbols to modify the at least one parameter of the plurality of parameters. ### Claim 4 (depends on 1) The method of claim 1, wherein the plurality of parameters comprises: a beam selection parameter; an automatic gain control parameter; a timing offset parameter; a frequency offset parameter; a noise estimation parameter; and a signal-to-noise ratio estimation parameter. ### Claim 5 (depends on 1) The method of claim 1, further comprising: processing the reference signal based, at least in part, on at least one of: a determination that there is data to receive on a physical downlink shared channel (PDSCH); a determination that a beam used for wireless communication has been changed by a base station and/or a mobile device that includes the processor; or a determination that the mobile device, when operating in a discontinuous reception (DRX) mode, has woken up. ### Claim 6 (depends on 1) The method of claim 1, wherein the reference signal is not a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or a tracking reference signal (TRS). ### Claim 7 (depends on 1) The method of claim 1, wherein the symbol on which the received reference signal is mapped is a symbol before a first symbol used for transmission of data on a physical downlink shared channel (PDSCH), and wherein the symbol on which the received reference signal is mapped and the first symbol used for transmission of data on the PDSCH are within a same subframe. ### Claim 8 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured to: receive a reference signal mapped, within a symbol, to resource elements that are separated from each other based, at least in part, on a repetition factor; and modify at least one parameter of a plurality of parameters based, at least in part, on processing of reference signal. ### Claim 9 (depends on 8) The apparatus of claim 8, further comprising: the at least one processor being configured to process a time-domain representation of the reference signal in which a same time-domain reference signal pattern is present a number of times within a time period, wherein the time period is equal to a time period of the symbol, and wherein the number of times the time-domain reference signal pattern is present within the time period is a function of the repetition factor. ### Claim 10 (depends on 8) The apparatus of claim 8, further comprising: the at least one processor being configured to: receive a number of symbols on which the reference signal is further mapped; and process the received number of symbols to modify the at least one parameter of the plurality of parameters. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein the plurality of parameters comprises: a beam selection parameter; an automatic gain control parameter; a timing offset parameter; a frequency offset parameter; a noise estimation parameter; and a signal-to-noise ratio estimation parameter. ### Claim 12 (depends on 8) The apparatus of claim 8, further comprising: the at least one processor being configured to process the reference signal based, at least in part, on at least one of: a determination that there is data to receive on a physical downlink shared channel (PDSCH); a determination that a beam used for wireless communication has been changed by a base station and/or a mobile device that includes the processor; or a determination that the mobile device, when operating in a discontinuous reception (DRX) mode, has woken up. ### Claim 13 (depends on 8) The apparatus of claim 8, wherein the reference signal is not a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or a tracking reference signal (TRS). ### Claim 14 (depends on 8) The apparatus of claim 8, wherein the symbol on which the received reference signal is mapped is a symbol before a first symbol used for transmission of data on a physical downlink shared channel (PDSCH), and wherein the symbol on which the received reference signal is mapped and the first symbol used for transmission of data on the PDSCH are within a same subframe. ### Claim 15 A method of wireless communication, comprising: determining a repetition factor for a repetitive intra-symbol reference signal mapping based on an event that triggered transmission of a reference signal; mapping the reference signal to resource elements of a symbol, wherein the resource elements used to map the reference signal are separated from each other based, at least in part, on the determined repetition factor of the repetitive intra-symbol reference signal mapping; and transmitting the mapped reference signal. ### Claim 16 (depends on 15) The method of claim 15, further comprising: determining a number of symbols on which to repeat the repetitive intra-symbol reference signal mapping based on the event that triggered the transmission of the reference signal; and mapping the reference signal to resource elements of one or more additional symbols based, at least in part, on the determined number of symbols. ### Claim 17 (depends on 16) The method of claim 16, wherein the repetition factor and/or the number of symbols are also determined based on at least one of a known capability of a mobile device or a level of mobility of the mobile device. ### Claim 18 (depends on 15) The method of claim 15, wherein the event that triggered the transmission of the reference signal comprises at least one of: a determination that there is data to transmit on a physical downlink shared channel (PDSCH); a determination that a beam used for wireless communication has been changed by a mobile device and/or a base station that includes the processor; or a determination that the mobile device, when operating in a discontinuous reception (DRX) mode, has woken up. ### Claim 19 (depends on 15) The method of claim 15, wherein the reference signal is not a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or a tracking reference signal (TRS). ### Claim 20 (depends on 15) The method of claim 15, wherein the reference signal replaces usage of at least one of a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or a tracking reference signal (TRS). ### Claim 21 (depends on 15) The method of claim 15, wherein the mapped reference signal is transmitted in a symbol before a first symbol used for transmission of data on a physical downlink shared channel (PDSCH), and wherein the symbol in which the reference signal is transmitted and the first symbol used for transmission of data on the PDSCH are within a same subframe. ### Claim 22 (depends on 15) The method of claim 15, wherein the repetition factor indicates how many empty resource elements within a symbol separate resource elements, within the symbol, on which the reference signal is mapped. ### Claim 23 An apparatus configured for wireless communication, the apparatus comprising: at least one processor; and a memory coupled to the at least one processor, wherein the at least one processor is configured to: determine a repetition factor for a repetitive intra-symbol reference signal mapping based on an event that triggered transmission of a reference signal; map the reference signal to resource elements of a symbol, wherein the resource elements used to map the reference signal are separated from each other based, at least in part, on the determined repetition factor of the repetitive intra-symbol reference signal mapping; and transmit the mapped reference signal. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the at least one processor is further configured to: determine a number of symbols on which to repeat the repetitive intra-symbol reference signal mapping based on the event that triggered the transmission of the reference signal; and map the reference signal to resource elements of one or more additional symbols based, at least in part, on the determined number of symbols. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the at least one processor is further configured to determine the repetition factor and/or the number of symbols based on at least one of a known capability of a mobile device or a level of mobility of the mobile device. ### Claim 26 (depends on 23) The apparatus of claim 23, wherein the event that triggered the transmission of the reference signal comprises at least one of: a determination that there is data to transmit on a physical downlink shared channel (PDSCH); a determination that a beam used for wireless communication has been changed by a mobile device and/or a base station that includes the processor; or a determination that the mobile device, when operating in a discontinuous reception (DRX) mode, has woken up. ### Claim 27 (depends on 23) The apparatus of claim 23, wherein the reference signal is not a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or a tracking reference signal (TRS). ### Claim 28 (depends on 23) The apparatus of claim 23, wherein the reference signal replaces usage of at least one of a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or a tracking reference signal (TRS). ### Claim 29 (depends on 23) The apparatus of claim 23, wherein the mapped reference signal is transmitted in a symbol before a first symbol used for transmission of data on a physical downlink shared channel (PDSCH), and wherein the symbol in which the reference signal is transmitted and the first symbol used for transmission of data on the PDSCH are within a same subframe. ### Claim 30 (depends on 23) The apparatus of claim 23, wherein the repetition factor indicates how many empty resource elements within a symbol separate resource elements, within the symbol, on which the reference signal is mapped.