# US 12,184,346 B2 · Predictive link adaptation for V2X communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,346 B2 - Document ID: US12184346B2 - Status: Granted - Kind: B2 - Application number: 17/647,972 - Filed: 2022-01-13 - Published: 2022-05-05 - Granted: 2024-12-31 - Earliest claimed: 2018-06-28 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Kapil Gulati; Sudhir Kumar Baghel; Arjun Bharadwaj; Shailesh Patil; Junyi Li - Web page: https://patentgrep.com/patent/US12184346B2 ## CPC - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0023: {characterised by the signalling} - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0634: {Antenna weights or vector/matrix coefficients} - H04B 17/373: Predicting channel quality {or other radio frequency [RF]} parameters - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - 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 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 25/0224: {using sounding signals} - H04L 25/067: {providing soft decisions, i.e. decisions together with an estimate of reliability (H04L25/068 and H04L25/069 take precedence; sequence estimation techniques H04L25/03178)} - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0023: {Time-frequency-space} - H04L 5/0082: {at predetermined intervals} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method, a computer-readable medium, and an apparatus are provided. The apparatus communicates with a second apparatus, including transmitting or receiving a first transmission. The apparatus receives information about the second UE from a sensor at the first UE and/or from a BSM. The apparatus determines whether the first apparatus and the second apparatus are in a LOS condition based on a correlation of the information with one or more of a channel estimation, PMI feedback, or RI feedback. The apparatus may adapt a transmission parameter for a second transmission based on a predicted location of the first apparatus or the second apparatus. The transmission parameter may include at least one of a modulation, a code rate, a DMRS density, a precoder, a CSI-RS transmission periodicity or a feedback rate. ## Claims ### Claim 1 A method of wireless communication of a first user equipment (UE), comprising: communicating with a second UE including transmitting or receiving a first transmission; and adapting a transmission parameter for a second transmission based on a predicted future location of the first UE or the second UE, wherein adapting the transmission parameter includes at least one of: adapting a code rate based on predicted channel quality indicator (CQI) feedback for a predicted path-loss change in path-loss between the first UE and the second UE, adapting a demodulation reference signal (DMRS) density based on whether a dominant line of sight (LOS) path exists and based on a modulation and coding scheme (MCS), adapting a precoder to rotate a precoding matrix indicator (PMI) feedback precoder based on a predicted angle of arrival (AoA) change in an AoA relative to the second UE, adapting the precoder by selecting a set of precoders based on an estimated range in the predicted future location of the first UE or the second UE, adapting the precoder based on the predicted future location of the first UE, the predicted future location of the second UE, and a predicted AoA relative to the second UE, adapting a feedback rate based on a predicted change in a location and a trajectory of at least one of the first UE or the second UE, or adapting the feedback rate based on Acknowledgment/Negative Acknowledgment (ACK/NACK) feedback between the first UE and the second UE. ### Claim 2 (depends on 1) The method of claim 1, further comprising: determining whether an energy of a line-of-sight (LOS) path is stronger than a sum energy of non-LOS (NLOS) paths between the first UE and the second UE, wherein the transmission parameter is adapted when the energy of the LOS path is determined to be stronger than the sum energy of the non-LOS paths. ### Claim 3 (depends on 1) The method of claim 1, wherein the predicted future location is determined based on at least one of information from a basic safety message (BSM) from the second UE or sensor information from a sensor at the first UE. ### Claim 4 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the code rate, and wherein the code rate is adapted based on the predicted CQI feedback for the predicted path-loss change in the path-loss between the first UE and the second UE. ### Claim 5 (depends on 4) The method of claim 4, wherein the predicted CQI feedback includes predicted Acknowledgment/Negative Acknowledgment (ACK/NACK) feedback. ### Claim 6 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the DMRS density based on whether the dominant LOS path exists and based on the MCS. ### Claim 7 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the precoder to rotate the PMI feedback precoder based on the predicted AoA change in the AoA relative to the second UE. ### Claim 8 (depends on 1) The method of claim 1, wherein adapting the transmission parameter further comprises adjusting a beam width based on the estimated range in the predicted future location of the first UE or the second UE. ### Claim 9 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the precoder by selecting the set of precoders based on the estimated range in the predicted future location of the first UE or the second UE. ### Claim 10 (depends on 9) The method of claim 9, further comprising: cycling through the set of precoders over a bandwidth of the second transmission. ### Claim 11 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the precoder based on the predicted future location of the first UE, the predicted future location of the second UE, and the predicted AoA relative to the second UE. ### Claim 12 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the feedback rate based on the predicted change in at least one of the location of the second UE and the trajectory of the second UE. ### Claim 13 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the feedback rate based on the predicted change in at least one of the location of the first UE and the trajectory of the first UE. ### Claim 14 (depends on 1) The method of claim 1, wherein adapting the transmission parameter comprises adapting the feedback rate based on the ACK/NACK feedback between the first UE and the second UE. ### Claim 15 An apparatus for wireless communication of a first user equipment (UE), comprising: means for communicating with a second UE including transmitting or receiving a first transmission; and means for adapting a transmission parameter for a second transmission based on a predicted future location of the apparatus or the second UE, wherein adapting the transmission parameter includes at least one of: adapting a code rate based on predicted channel quality indicator (CQI) feedback for a predicted path-loss change in path-loss between the first UE and the second UE, adapting a demodulation reference signal (DMRS) density based on whether a dominant line of sight (LOS) path exists and based on a modulation and coding scheme (MCS), adapting a precoder to rotate a precoding matrix indicator (PMI) feedback precoder based on a predicted angle of arrival (AoA) change in an AoA relative to the second UE, adapting the precoder by selecting a set of precoders based on an estimated range in the predicted future location of the first UE or the second UE, adapting the precoder based on the predicted future location of the first UE, the predicted future location of the second UE, and a predicted AoA relative to the second UE, adapting a feedback rate based on a predicted change in a location and a trajectory of at least one of the first UE or the second UE, or adapting the feedback rate based on Acknowledgment/Negative Acknowledgment (ACK/NACK) feedback between the first UE and the second UE. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the means for adapting the transmission parameter are configured to adapt the code rate based on adjusting the CQI feedback for the predicted path-loss change in the path-loss between the first UE and the second UE. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the means for adapting the transmission parameter are configured to adapt the DMRS density based on whether the dominant LOS path exists and based on the MCS. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the means for adapting the transmission parameter are configured to adapt the precoder by rotating the PMI feedback precoder based on the predicted AoA change in the AoA relative to the second UE. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the means for adapting the transmission parameter are configured to adapt the feedback rate based on the predicted change in the at least one of the location and the trajectory of at least one of the second UE and the first UE. ### Claim 20 An apparatus for wireless communication of a first user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: communicate with a second UE including transmitting or receiving a first transmission; and adapt a transmission parameter for a second transmission based on a predicted future location of the apparatus or the second UE, wherein adaptation of the transmission parameter includes at least one of: a first adaptation of a code rate based on predicted channel quality indicator (CQI) feedback for a predicted path-loss change in path-loss between the first UE and the second UE, a second adaptation of a demodulation reference signal (DMRS) density based on whether a dominant line of sight (LOS) path exists and based on a modulation and coding scheme (MCS), a third adaptation of a precoder to rotate a precoding matrix indicator (PMI) feedback precoder based on a predicted angle of arrival (AoA) change in an AoA relative to the second UE, a fourth adaptation of the precoder by selecting a set of precoders based on an estimated range in the predicted future location of the first UE or the second UE, a fifth adaptation of the precoder based on the predicted future location of the first UE, the predicted future location of the second UE, and a predicted AoA relative to the second UE, a sixth adaptation of a feedback rate based on a predicted change in a location and a trajectory of at least one of the first UE or the second UE, or a seventh adaptation of the feedback rate based on Acknowledgment/Negative Acknowledgment (ACK/NACK) feedback between the first UE and the second UE. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein to adapt the transmission parameter, the at least one processor is configured to adapt the code rate based on adjusting the CQI feedback for the predicted change in path-loss between the first UE and the second UE. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein to adapt the transmission parameter, the at least one processor is configured to adapt the DMRS density based on whether the dominant LOS path exists and based on the MCS. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein to adapt the transmission parameter, the at least one processor is configured to adapt the precoder by rotating the PMI feedback precoder based on the predicted AoA change in the AoA relative to the second UE. ### Claim 24 (depends on 20) The apparatus of claim 20, wherein to adapt the transmission parameter, the at least one processor is configured to adapt the feedback rate based on the predicted change in at least one of the location and the trajectory of at least one of the second UE or the first UE. ### Claim 25 (depends on 20) The apparatus of claim 20, wherein to adapt the transmission parameter, the at least one processor is configured to adapt the precoder by selecting the set of precoders based on the estimated range in the predicted future location of the first UE or the second UE. ### Claim 26 (depends on 20) The apparatus of claim 20, wherein to adapt the transmission parameter, the at least one processor is configured to adapt the feedback rate based on the ACK/NACK feedback between the first UE and the second UE. ### Claim 27 A non-transitory computer-readable medium storing instructions for wireless communication at a first user equipment (UE), the instructions executable by one or more processors to cause the one or more processors to: communicate with a second UE including transmitting or receiving a first transmission; and adapt a transmission parameter for a second transmission based on a predicted future location of the first UE or the second UE, wherein adaptation of the transmission parameter includes at least one of: a first adaptation of a code rate based on predicted channel quality indicator (CQI) feedback for a predicted path-loss change in path-loss between the first UE and the second UE, a second adaptation of a demodulation reference signal (DMRS) density based on whether a dominant line of sight (LOS) path exists and based on a modulation and coding scheme (MCS), a third adaptation of a precoder to rotate a precoding matrix indicator (PMI) feedback precoder based on a predicted angle of arrival (AoA) change in an AoA relative to the second UE, a fourth adaptation of the precoder by selecting a set of precoders based on an estimated range in the predicted future location of the first UE or the second UE, a fifth adaptation of the precoder based on the predicted future location of the first UE, the predicted future location of the second UE, and a predicted AoA relative to the second UE, a sixth adaptation of a feedback rate based on a predicted change in a location and a trajectory of at least one of the first UE or the second UE, or a seventh adaptation of the feedback rate based on Acknowledgment/Negative Acknowledgment (ACK/NACK) feedback between the first UE and the second UE.