# US 12,119,863 B2 · Frequency pre-compensation for high-speed train single frequency networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,119,863 B2 - Document ID: US12119863B2 - Status: Granted - Kind: B2 - Application number: 18/334,446 - Filed: 2023-06-14 - Published: 2023-10-19 - Granted: 2024-10-15 - Earliest claimed: 2020-04-10 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Kiran Venugopal; Wooseok Nam; Sungwoo Park; Tianyang Bai; Tao Luo; Junyi Li - Web page: https://patentgrep.com/patent/US12119863B2 ## CPC - H04B 1/62: for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - 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 25/03343: {Arrangements at the transmitter end} - H04L 27/0014: {Carrier regulation (of chaotic carriers H04L27/001; for multicarrier receivers H04L27/2657)} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04L 25/0224: {using sounding signals} - H04L 2027/0018: {Arrangements at the transmitter end} - 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) ## Abstract Wireless communication devices, systems, and methods related to mechanisms for transmitting and receiving reference signals in a high-speed train (HST) single frequency network (SFN). A base station (BS) determines a first frequency pre-compensation value for a reference signal transmitted via a first transmission and reception point (TRP) and a second frequency pre-compensation value for a reference signal via a second TRP. The BS notifies a user equipment (UE) of the first and second pre-compensation values through at least one of the TRPs. The BS applies the first pre-compensation value to the reference signal via the first TRP and the second pre-compensation value to the reference signal via the second TRP. The UE adjusts its tracking loop for the reference signal based on the pre-compensation values, reducing estimation and/or search overhead at the UE. ## Claims ### Claim 1 A method of wireless communications, comprising: determining, by a base station, a frequency pre-compensation for a transmission and reception point (TRP) on a single frequency network (SFN); transmitting, by the base station to a user equipment (UE), a configuration associated with the frequency pre-compensation via the TRP; and applying, by the base station, the frequency pre-compensation to a signal for transmission by the TRP to the UE. ### Claim 2 (depends on 1) The method of claim 1, wherein the signal comprises a first signal, and the frequency pre-compensation comprises a first frequency pre-compensation associated with a first Transmission Configuration Indicator (TCI) state, further comprising: determining, by the base station, a second frequency pre-compensation for the TRP associated with a second TCI state; and applying, by the base station, the second frequency pre-compensation to a second signal for transmission by the TRP to the UE. ### Claim 3 (depends on 1) The method of claim 1, wherein the TRP comprises a first TRP and the frequency pre-compensation comprises a first frequency pre-compensation, the method further comprising: determining, by the base station, a second frequency pre-compensation for a second TRP on the SFN for use with the signal; transmitting, by the base station, a second configuration associated with the second frequency pre-compensation to the UE via the first TRP or the second TRP; and applying, by the base station, the second frequency pre-compensation to the signal for transmission by the second TRP to the UE. ### Claim 4 (depends on 1) The method of claim 1, wherein the frequency pre-compensation is determined based on a frequency measurement of a reference signal from the UE. ### Claim 5 (depends on 1) The method of claim 1, wherein the frequency pre-compensation is determined based on a frequency measurement of a reference signal from the base station. ### Claim 6 A method of wireless communications, comprising: receiving, by a user equipment (UE) on a single frequency network (SFN), a configuration associated with a frequency pre-compensation for use by a transmission and reception point (TRP); receiving, by the UE, a signal modified by the frequency pre-compensation; and performing, by the UE, channel estimation of the signal based on the configuration. ### Claim 7 (depends on 6) The method of claim 6, further comprising: narrowing, by the UE, a range of a tracking loop based on the configuration. ### Claim 8 (depends on 6) The method of claim 6, wherein the performing channel estimation further comprises: tracking a frequency of the signal with an initial value based on the configuration. ### Claim 9 (depends on 6) The method of claim 6, wherein the signal comprises a first signal, and the configuration comprises a first configuration associated with a first Transmission Configuration Indicator (TCI) state, further comprising: receiving, by the UE from the TRP, a second configuration associated with a second frequency pre-compensation associated with a second TCI state for use by the TRP; and receiving, by the UE from the TRP, a second signal modified by the second frequency pre-compensation; wherein the channel estimation is further based on the second configuration. ### Claim 10 (depends on 6) The method of claim 6, wherein the TRP comprises a first TRP, the receiving the signal further comprising receiving the signal from a second TRP as well as the first TRP. ### Claim 11 (depends on 10) The method of claim 10, wherein the frequency pre-compensation comprises a first frequency pre-compensation, the receiving the frequency pre-compensation further comprising: receiving, by the UE from a second TRP, a second configuration associated with a second frequency pre-compensation for use by the second TRP. ### Claim 12 (depends on 11) The method of claim 11, wherein the channel estimation is based on the second frequency pre-compensation as well as the first frequency pre-compensation. ### Claim 13 (depends on 6) The method of claim 6, wherein the configuration is part of a downlink control information (DCI) message. ### Claim 14 (depends on 6) The method of claim 6, wherein the frequency pre-compensation is determined based on a frequency measurement of a reference signal from the UE. ### Claim 15 (depends on 6) The method of claim 6, wherein the frequency pre-compensation is determined based on a frequency measurement of a reference signal from the TRP. ### Claim 16 A base station, comprising: a memory; a transceiver; and a processor coupled with the memory and the transceiver and configured, when executing instructions stored on the memory, to cause the base station to: determine a frequency pre-compensation for a transmission and reception point (TRP) on a single frequency network (SFN); transmit to a user equipment (UE) a configuration associated with the frequency pre-compensation via the TRP; and apply the frequency pre-compensation to a signal for transmission by the TRP to the UE. ### Claim 17 (depends on 16) The base station of claim 16, wherein the signal comprises a first signal, and the frequency pre-compensation comprises a first frequency pre-compensation associated with a first Transmission Configuration Indicator (TCI) state, the transceiver and the processor further configured to: determine a second frequency pre-compensation for the TRP associated with a second TCI state; and apply the second frequency pre-compensation to a second signal for transmission by the TRP to the UE. ### Claim 18 (depends on 16) The base station of claim 16, wherein the TRP comprises a first TRP, the frequency pre-compensation comprises a first frequency pre-compensation, and the transceiver and the processor are further configured to: determine a second frequency pre-compensation for a second TRP on the SFN for use with the signal; indicate the second frequency pre-compensation to the UE via the first TRP or the second TRP; and apply the second frequency pre-compensation to the signal for transmission by the second TRP to the UE. ### Claim 19 (depends on 16) The base station of claim 16, wherein the transceiver and the processor are configured to determine the frequency pre-compensation by: estimating the frequency pre-compensation based on a measurement, by the TRP, of a reference signal from the UE. ### Claim 20 (depends on 16) The base station of claim 16, wherein the transceiver and the processor are configured to determine the frequency pre-compensation by: estimating the frequency pre-compensation based on a measurement, by the UE, of a reference signal from the base station. ### Claim 21 A user equipment (UE), comprising: a memory; a transceiver; and a processor coupled with the memory and the transceiver and configured, when executing instructions stored on the memory, to cause the UE to: receive on a single frequency network (SFN) a configuration associated with a frequency pre-compensation for use by a transmission and reception point (TRP); receive a signal modified by the frequency pre-compensation; and perform channel estimation of the signal based on the configuration. ### Claim 22 (depends on 21) The UE of claim 21, further comprising: Narrowing a range of a tracking loop based on the configuration. ### Claim 23 (depends on 21) The UE of claim 21, wherein the performing channel estimation further comprises: tracking a frequency of the signal with an initial value based on the configuration. ### Claim 24 (depends on 21) The UE of claim 21, wherein the signal comprises a first signal, and the configuration comprises a first configuration associated with a first Transmission Configuration Indicator (TCI) state, the transceiver and the processor further configured to: receive, from the TRP, a second configuration associated with a second frequency pre-compensation associated with a second TCI state for use by the TRP; and receive, from the TRP, a second signal modified by the second frequency pre-compensation; and perform channel estimation further based on the second configuration. ### Claim 25 (depends on 21) The UE of claim 21, wherein the TRP comprises a first TRP, and the transceiver and the processor are configured to receive the signal by receiving the signal from a second TRP as well as the first TRP. ### Claim 26 (depends on 25) The UE of claim 25, wherein the configuration comprises a first configuration, and the transceiver and the processor are further configured to receive a second configuration associated with a second frequency pre-compensation from the second TRP. ### Claim 27 (depends on 26) The UE of claim 26, wherein the channel estimation is based on the second frequency pre-compensation as well as the first configuration. ### Claim 28 (depends on 21) The UE of claim 21, wherein the configuration is part of a downlink control information (DCI) message. ### Claim 29 (depends on 21) The UE of claim 21, wherein the frequency pre-compensation is determined based on a frequency measurement, by the TRP, of a reference signal from the UE. ### Claim 30 (depends on 21) The UE of claim 21, wherein the frequency pre-compensation is determined based on a frequency measurement, by the UE, of a reference signal from the TRP.