# US 2026/0100734 A1 · Methods, apparatuses and systems related to enabling csi-based near field spot beams > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100734 A1 - Document ID: US20260100734A1 - Status: Published application - Kind: A1 - Application number: 18/906,608 - Filed: 2024-10-04 - Published: 2026-04-09 - Earliest claimed: 2024-10-04 - Applicants: InterDigital Patent Holdings, Inc. - Inventors: Salah Elhoushy; Patrick Svedman; Afshin Haghighat; Allan Yingming Tsai; Chia-Hung Wei; Yifan Li; Ravikumar Pragada - Web page: https://patentgrep.com/patent/US20260100734A1 ## CPC - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0639: {Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection} - H04B: TRANSMISSION ## Abstract In an embodiment, a method implemented in a WTRU comprises receiving a first message comprising first information indicating a configuration of a set of precoders, a set of correction factors, association between each precoder of the set of precoders with at least one correction factor from the set of correction factors, and at least one RS; receiving at least one reference signal; determining a first precoder based on at least one measurement on the at least one RS; determining a subset of correction factors associated with the first precoder; determining a correction factor from the subset of correction factors; determining a second precoder based on the first precoder and the determined correction factor; and transmitting a second message comprising second information indicating the second precoder. ## Claims ### Claim 1 A method implemented in a wireless transmit/receive unit (WTRU) comprising: receiving a first message comprising first information indicating a configuration of a set of precoders, a set of correction factors, association between each precoder of the set of precoders with at least one correction factor from the set of correction factors, and at least one reference signal (RS); receiving, from a transmission reception point (TRP), at least one reference signal; determining a first precoder from the set of precoders based on at least one measurement on the at least one RS; determining, from the set of correction factors, a subset of correction factors associated with the first precoder; determining a correction factor from the subset of correction factors; determining a second precoder based on the first precoder and the determined correction factor; and transmitting, to the TRP, a second message comprising second information indicating the second precoder. ### Claim 2 (depends on 1) The method of claim 1, wherein the first precoder is a far field precoder and wherein the second precoder is a near field precoder. ### Claim 3 (depends on 1) The method of claim 1, wherein determining the second precoder comprises element-wise multiplication between a first precoder vector and a phase correction vector of the correction factor; wherein the first precoder comprises the first precoder vector. ### Claim 4 (depends on 1) The method of claim 1, comprising: determining the correction factor from the subset of correction factors based on at least one additional measurement on the received at least one RS. ### Claim 5 (depends on 4) The method of claim 4, wherein the at least one additional measurement comprises a measurement of reference signal received power. ### Claim 6 (depends on 1) The method of claim 1, wherein the second information indicates one or more first indices related to the first precoder and one or more second indices related to the determined correction factor. ### Claim 7 (depends on 1) The method of claim 1, wherein the first information further indicates one or more subset of correction factors from the set of correction factors, and wherein each subset of correction factors is associated with a distance range between the TRP and the WTRU, the method comprising: determining a distance range between the TRP and the WTRU based on the received at least one reference signal; and determining the subset of correction factors from the set of correction factors based on an association between the determined distance range and the subset of correction factors. ### Claim 8 (depends on 1) The method of claim 1, wherein the first information further indicates at least one minimum correction factor, at least one maximum correction factor, at least one quantization level, and association between each precoder of the set of precoders and a minimum correction factor, a maximum correction factor, and a quantization level, the method comprising: determining the subset of correction factors based on an association of a minimum correction factor, a maximum correction factor, and a quantization level with the first precoder. ### Claim 9 (depends on 8) The method of claim 8, comprising: determining the subset of correction factors based on a determined distance range between the TRP and the WTRU based on the received at least one reference signal, and based on a minimum or a maximum correction factor, and a quantization level associated with the first precoder. ### Claim 10 (depends on 1) The method of claim 1, wherein the first information further indicates one or more subset of correction factors of the set of correction factors, an association of each correction factor of the subset of correction factors with result of measurement on the at least one RS, and wherein the determination of the correction factor from the set of correction factors is based on an association of the result of at least one additional measurement with the correction factor. ### Claim 11 A wireless transmit/receive unit (WTRU) comprising a processor, a transmitter, a receiver and a memory, configured to: receive a first message comprising first information indicating a configuration of a set of precoders, a set of correction factors, association between each precoder of the set of precoders with at least one correction factor from the set of correction factors, and at least one reference signal (RS); receive, from a transmission reception point (TRP), at least one reference signal; determine a first precoder from the set of precoders based on at least one measurement on the at least one RS; determine, from the set of correction factors, a subset of correction factors associated with the first precoder; determine a correction factor from the subset of correction factors; determine a second precoder based on the first precoder and the determined correction factor; and transmit, to the TRP, a second message comprising second information indicating the second precoder. ### Claim 12 (depends on 11) The WTRU of claim 11, wherein the first precoder is a far field precoder and wherein the second precoder is a near field precoder. ### Claim 13 (depends on 11) The WTRU of claim 11, wherein determining the second precoder comprises element-wise multiplication between a first precoder vector and a phase correction vector of the correction factor; wherein the first precoder comprises the first precoder vector. ### Claim 14 (depends on 11) The WTRU of claim 11, configured to: determine the correction factor from the subset of correction factors based on at least one additional measurement on the received at least one RS. ### Claim 15 (depends on 14) The WTRU of claim 14, wherein the at least one additional measurement comprises a measurement of reference signal received power. ### Claim 16 (depends on 11) The WTRU of claim 11, wherein the second information indicates one or more first indices related to the first precoder and one or more second indices related to the determined correction factor. ### Claim 17 (depends on 11) The WTRU of claim 11, wherein the first information further indicates one or more subset of correction factors from the set of correction factors, and wherein each subset of correction factors is associated with a distance range between the TRP and the WTRU, configured to: determine a distance range between the TRP and the WTRU based on the received at least one reference signal; and determine the subset of correction factors from the set of correction factors based on an association between the determined distance range and the subset of correction factors. ### Claim 18 (depends on 11) The WTRU of claim 11, wherein the first information further indicates at least one minimum correction factor, at least one maximum correction factor, at least one quantization level, and association between each precoder of the set of precoder and a minimum correction factor, a maximum correction factor, and a quantization level, configured to: determine the subset of correction factors based on an association of a minimum correction factor, a maximum correction factor, and a quantization level with the first precoder. ### Claim 19 (depends on 18) The WTRU of claim 18, configured to: determine the subset of correction factors based on a determined distance range between the TRP and the WTRU based on the received at least one reference signal, and based on a minimum or a maximum correction factor, and a quantization level associated with the first precoder. ### Claim 20 (depends on 11) The WTRU of claim 11, wherein the first information further indicates one or more subset of correction factors of the set of correction factors, an association of each correction factor of the subset of correction factors with result of measurement on the at least one RS, and wherein the determination of the correction factor from the set of correction factors is based on an association of the result of at least one additional measurement with the correction factor.