# US 11,444,734 B2 · Beam-specific group delay / frequency lookup table signaling for high-precision multi-round-trip-time > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,734 B2 - Document ID: US11444734B2 - Status: Granted - Kind: B2 - Application number: 16/795,338 - Filed: 2020-02-19 - Published: 2021-03-11 - Granted: 2022-09-13 - Earliest claimed: 2019-09-10 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alexandros Manolakos; Alexander Dorosenco; Jay King; Joseph Binamira Soriaga; Joseph Patrick Burke - Web page: https://patentgrep.com/patent/US11444734B2 ## CPC - H04B 17/364: Delay profiles - G01S 13/765: {with exchange of information between interrogator and responder} - G01S 13/878: {Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector (G01S13/874 takes precedence)} - H04B 7/088: {using beam selection} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04W 64/00: Locating users or terminals {or network equipment} for network management purposes, e.g. mobility management - H04W 72/044: based on the type of the allocated resource - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/51: based on terminal or device properties - 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)} - H04W 16/28: using beam steering - H04B: TRANSMISSION - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - 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 Disclosed are techniques for reporting a group delay-per-frequency lookup table for transmit and receive beams. In an aspect, a user equipment (UE) receives, from a transmission-reception point (TRP), a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam, transmits, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam, determines a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal, transmit the parameter to a network entity, and transmits, to the network entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam. ## Claims ### Claim 1 A user equipment (UE), comprising: a memory; at least one transceiver; and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: receive, from a transmission-reception point (TRP) via the at least one transceiver, a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam; cause the at least one transceiver to transmit, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam; determine a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal; cause the at least one transceiver to transmit the parameter to a network entity; and cause the at least one transceiver to transmit, to the network entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam. ### Claim 2 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to: cause the at least one transceiver to transmit, to the network entity, an identifier associated with the downlink receive beam. ### Claim 3 (depends on 2) The UE of claim 2, wherein the identifier associated with the downlink receive beam is an identifier of the first downlink reference signal. ### Claim 4 (depends on 2) The UE of claim 2, wherein the identifier associated with the downlink receive beam is an identifier of the at least one downlink reference signal resource. ### Claim 5 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to: cause the at least one transceiver to transmit, to the network entity, a second lookup table or an identifier of the second lookup table, wherein the second lookup table represents per-frequency group delay information for the uplink transmit beam, and wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam. ### Claim 6 (depends on 5) The UE of claim 5, wherein the at least one processor is further configured to: cause the at least one transceiver to transmit, to the network entity, an identifier associated with the downlink receive beam; and/or cause the at least one transceiver to transmit, to the network entity, an identifier associated with the uplink transmit beam. ### Claim 7 (depends on 6) The UE of claim 6, wherein: the identifier associated with the downlink receive beam is an identifier of the first downlink reference signal, and/or the identifier associated with the uplink transmit beam is an identifier of the uplink reference signal. ### Claim 8 (depends on 6) The UE of claim 6, wherein: the identifier associated with the downlink receive beam is an identifier of the at least one downlink reference signal resource, and/or the identifier associated with the uplink transmit beam is an identifier of the at least one uplink reference signal resource. ### Claim 9 (depends on 8) The UE of claim 8, wherein: the first downlink reference signal is a positioning reference signal (PRS), the uplink reference signal is a sounding reference signal (SRS), the identifier of the at least one downlink reference signal resource is an identifier of a PRS resource or a PRS resource set on which the PRS is transmitted, and the identifier of the at least one uplink reference signal resource is an identifier of an SRS resource or an SRS resource set on which the SRS is transmitted. ### Claim 10 (depends on 8) The UE of claim 8, wherein the at least one processor being configured to cause the at least one transceiver to transmit the second lookup table comprises the at least one processor being configured to cause the at least one transceiver to transmit only differences between the first lookup table and the second lookup table. ### Claim 11 (depends on 6) The UE of claim 6, wherein: the identifier associated with the downlink receive beam is an identifier of the downlink receive beam, and the identifier associated with the uplink transmit beam is an identifier of the uplink transmit beam. ### Claim 12 (depends on 6) The UE of claim 6, wherein the at least one processor is further configured to: receive, from the TRP or a second TRP via the at least one transceiver, a second downlink reference signal on the downlink receive beam associated with the reception of the first downlink reference signal. ### Claim 13 (depends on 12) The UE of claim 12, wherein: the second downlink reference signal is a quasi-collocation source reference signal for the first downlink reference signal, and the identifier associated with the downlink receive beam is an identifier of the second downlink reference signal. ### Claim 14 (depends on 12) The UE of claim 12, wherein: the second downlink reference signal is a spatial relation reference downlink reference signal for the uplink reference signal, and the identifier associated with the uplink transmit beam is an identifier of the second downlink reference signal. ### Claim 15 (depends on 12) The UE of claim 12, wherein the second downlink reference signal is a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), or a PRS. ### Claim 16 (depends on 5) The UE of claim 5, wherein the at least one processor causes the at least one transceiver to transmit the first lookup table or the identifier of the first lookup table before or simultaneously with transmission of the second lookup table or the identifier of the second lookup table to indicate that the first lookup table represents the per-frequency group delay information for the downlink receive beam and the second lookup table represents the per-frequency group delay information for the uplink transmit beam. ### Claim 17 (depends on 5) The UE of claim 5, wherein the at least one processor causes the at least one transceiver to transmit the second lookup table or the identifier of the second lookup table before or simultaneously with transmission of the first lookup table or the identifier of the first lookup table to indicate that the first lookup table represents the per-frequency group delay information for the downlink receive beam and the second lookup table represents the per-frequency group delay information for the uplink transmit beam. ### Claim 18 (depends on 1) The UE of claim 1, wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam and the uplink transmit beam. ### Claim 19 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to: cause the at least one transceiver to transmit the first lookup table to the network entity before reception of the first downlink reference signal from the TRP. ### Claim 20 (depends on 19) The UE of claim 19, wherein the per-frequency group delay information represented by the first lookup table comprise ranges of average group delay, group delay spread, or both for the downlink receive beam and/or the uplink transmit beam. ### Claim 21 (depends on 19) The UE of claim 19, wherein the at least one processor causes the at least one transceiver to transmit the identifier of the first lookup table to the network entity after reception of the first downlink reference signal from the TRP. ### Claim 22 (depends on 21) The UE of claim 21, wherein the first lookup table has not changed between transmission of the first lookup table and transmission of the identifier of the first lookup table. ### Claim 23 (depends on 1) The UE of claim 1, wherein the at least one processor is further configured to: receive, via the at least one transceiver, a trigger from the network entity to transmit the first lookup table. ### Claim 24 (depends on 1) The UE of claim 1, wherein the first lookup table represents a plurality of frequency bins for a carrier frequency on which the first downlink reference signal is transmitted, wherein each frequency bin is associated with a group delay for the downlink receive beam when formed at a frequency within the frequency bin. ### Claim 25 (depends on 1) The UE of claim 1, wherein the network entity is the TRP or a location server. ### Claim 26 A network entity, comprising: a memory; at least one network interface; and at least one processor communicatively coupled to the memory and the network interface, the at least one processor configured to: cause the at least one network interface to transmit, to a user equipment (UE), an identification of at least one downlink reference signal resource to enable the UE to receive, from a transmission-reception point (TRP), a first downlink reference signal on the at least one downlink reference signal resource using a downlink receive beam; cause the at least one network interface to transmit, to the UE, an identification of at least one uplink reference signal resource to enable the UE to transmit, to the TRP, an uplink reference signal on the at least one uplink reference signal resource using an uplink transmit beam; receive, from the UE via the at least one network interface, a parameter representing a difference between a reception time at the UE of the first downlink reference signal and a transmission time of the uplink reference signal from the UE; receive, from the UE via the at least one network interface, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam; and estimate a position of the UE based, in part, on the difference between the reception time of the first downlink reference signal and the transmission time of the uplink reference signal and a group delay for the downlink receive beam and/or the uplink transmit beam retrieved from the first lookup table. ### Claim 27 (depends on 26) The network entity of claim 26, wherein the at least one processor is further configured to: receive, from the UE via the at least one network interface, an identifier associated with the downlink receive beam. ### Claim 28 (depends on 27) The network entity of claim 27, wherein the identifier associated with the downlink receive beam is an identifier of the first downlink reference signal. ### Claim 29 (depends on 27) The network entity of claim 27, wherein the identifier associated with the downlink receive beam is an identifier of the at least one downlink reference signal resource. ### Claim 30 (depends on 26) The network entity of claim 26, wherein the at least one processor is further configured to: receive, from the UE via the at least one network interface, a second lookup table or an identifier of the second lookup table, wherein the second lookup table represents per-frequency group delay information for the uplink transmit beam, and wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam. ### Claim 31 (depends on 30) The network entity of claim 30, wherein the at least one processor is further configured to: receive, from the UE via the at least one network interface, an identifier associated with the downlink receive beam; and receive, from the UE via the at least one network interface, an identifier associated with the uplink transmit beam. ### Claim 32 (depends on 31) The network entity of claim 31, wherein: the identifier associated with the downlink receive beam is an identifier of the first downlink reference signal, and the identifier associated with the uplink transmit beam is an identifier of the uplink reference signal. ### Claim 33 (depends on 31) The network entity of claim 31, wherein: the identifier associated with the downlink receive beam is an identifier of the at least one downlink reference signal resource, and the identifier associated with the uplink transmit beam is an identifier of the at least one uplink reference signal resource. ### Claim 34 (depends on 33) The network entity of claim 33, wherein: the first downlink reference signal is a positioning reference signal (PRS), the uplink reference signal is a sounding reference signal (SRS), the identifier of the at least one downlink reference signal resource is an identifier of a PRS resource or a PRS resource set on which the PRS is transmitted, and the identifier of the at least one uplink reference signal resource is an identifier of an SRS resource or an SRS resource set on which the SRS is transmitted. ### Claim 35 (depends on 31) The network entity of claim 31, wherein: the identifier associated with the downlink receive beam is an identifier of the downlink receive beam, and the identifier associated with the uplink transmit beam is an identifier of the uplink transmit beam. ### Claim 36 (depends on 31) The network entity of claim 31, wherein the at least one processor is further configured to: cause the at least one network interface to transmit, to the UE, an identification of a second at least one downlink reference signal resource to enable the UE to receive, before reception of the first downlink reference signal, a second downlink reference signal on the second at least one downlink reference signal resource using the downlink receive beam. ### Claim 37 (depends on 36) The network entity of claim 36, wherein: the second downlink reference signal is a quasi-collocation source reference signal for the first downlink reference signal, and the identifier associated with the downlink receive beam is an identifier of the second downlink reference signal. ### Claim 38 (depends on 36) The network entity of claim 36, wherein: the second downlink reference signal is a spatial relation reference downlink reference signal for the uplink reference signal, and the identifier associated with the uplink transmit beam is an identifier of the second downlink reference signal. ### Claim 39 (depends on 36) The network entity of claim 36, wherein the second downlink reference signal is a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a tracking reference signal (TRS), or a PRS. ### Claim 40 (depends on 36) The network entity of claim 36, wherein the at least one downlink reference signal resource is the same as the second at least one downlink reference signal resource. ### Claim 41 (depends on 30) The network entity of claim 30, wherein reception of the first lookup table or the identifier of the first lookup table before or simultaneously with reception of the second lookup table or the identifier of the second lookup table indicates that the first lookup table represents the per-frequency group delay information for the downlink receive beam and the second lookup table represents the per-frequency group delay information for the uplink transmit beam. ### Claim 42 (depends on 30) The network entity of claim 30, wherein reception of the second lookup table or the identifier of the second lookup table before or simultaneously with reception of the first lookup table or the identifier of the first lookup table indicates that the first lookup table represents the per-frequency group delay information for the downlink receive beam and the second lookup table represents the per-frequency group delay information for the uplink transmit beam. ### Claim 43 (depends on 30) The network entity of claim 30 wherein the second lookup table comprises only differences between the first lookup table and the second lookup table. ### Claim 44 (depends on 26) The network entity of claim 26, wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam and the uplink transmit beam. ### Claim 45 (depends on 26) The network entity of claim 26, wherein the first lookup table is received before transmission to the UE of the identification of the at least one downlink reference signal resource. ### Claim 46 (depends on 45) The network entity of claim 45, wherein the per-frequency group delay information represented by the first lookup table comprise ranges of average group delay, group delay spread, or both for the downlink receive beam and/or the uplink transmit beam. ### Claim 47 (depends on 45) The network entity of claim 45, wherein the identifier of the first lookup table is received after transmission to the UE of the identification of the at least one downlink reference signal resource. ### Claim 48 (depends on 47) The network entity of claim 47, wherein the first lookup table has not changed between reception of the first lookup table and reception of the identifier of the first lookup table. ### Claim 49 (depends on 26) The network entity of claim 26, wherein the at least one processor is further configured to: cause the at least one network interface to transmit a trigger to the UE to transmit the first lookup table. ### Claim 50 (depends on 26) The network entity of claim 26, wherein the first lookup table represents a plurality of frequency bins for a carrier frequency on which the first downlink reference signal is transmitted, wherein each frequency bin is associated with a group delay for the downlink receive beam when formed at a frequency within the frequency bin. ### Claim 51 (depends on 26) The network entity of claim 26, wherein the network entity is the TRP or a location server. ### Claim 52 A method of wireless communication performed by a user equipment (UE), comprising: receiving, from a transmission-reception point (TRP), a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam; transmitting, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam; determining a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal; transmitting the parameter to a network entity; and transmitting, to the network entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam. ### Claim 53 (depends on 52) The method of claim 52, further comprising: transmitting, to the network entity, an identifier associated with the downlink receive beam. ### Claim 54 (depends on 52) The method of claim 52, further comprising: transmitting, to the network entity, a second lookup table or an identifier of the second lookup table, wherein the second lookup table represents per-frequency group delay information for the uplink transmit beam, and wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam. ### Claim 55 (depends on 54) The method of claim 54, further comprising: transmitting, to the network entity, an identifier associated with the downlink receive beam; and/or transmitting, to the network entity, an identifier associated with the uplink transmit beam. ### Claim 56 (depends on 55) The method of claim 55, further comprising: receiving, from the TRP or a second TRP, a second downlink reference signal on the downlink receive beam associated with the reception of the first downlink reference signal. ### Claim 57 (depends on 54) The method of claim 54, wherein the UE transmits the first lookup table or the identifier of the first lookup table before or simultaneously with transmission of the second lookup table or the identifier of the second lookup table to indicate that the first lookup table represents the per-frequency group delay information for the downlink receive beam and the second lookup table represents the per-frequency group delay information for the uplink transmit beam. ### Claim 58 (depends on 54) The method of claim 54, wherein the UE transmits the second lookup table or the identifier of the second lookup table before or simultaneously with transmission of the first lookup table or the identifier of the first lookup table to indicate that the first lookup table represents the per-frequency group delay information for the downlink receive beam and the second lookup table represents the per-frequency group delay information for the uplink transmit beam. ### Claim 59 (depends on 52) The method of claim 52, wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam and the uplink transmit beam. ### Claim 60 (depends on 52) The method of claim 52, further comprising: transmitting the first lookup table to the network entity before reception of the first downlink reference signal from the TRP. ### Claim 61 (depends on 52) The method of claim 52, wherein the first lookup table represents a plurality of frequency bins for a carrier frequency on which the first downlink reference signal is transmitted, wherein each frequency bin is associated with a group delay for the downlink receive beam when formed at a frequency within the frequency bin. ### Claim 62 (depends on 52) The method of claim 52, wherein the network entity is the TRP or a location server. ### Claim 63 A method of wireless communication performed by a network entity, comprising: transmitting, to a user equipment (UE), an identification of at least one downlink reference signal resource to enable the UE to receive, from a transmission-reception point (TRP), a first downlink reference signal on the at least one downlink reference signal resource using a downlink receive beam; transmitting, to the UE, an identification of at least one uplink reference signal resource to enable the UE to transmit, to the TRP, an uplink reference signal on the at least one uplink reference signal resource using an uplink transmit beam; receiving, from the UE, a parameter representing a difference between a reception time at the UE of the first downlink reference signal and a transmission time of the uplink reference signal from the UE; receiving, from the UE, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam; and estimating a position of the UE based, in part, on the difference between the reception time of the first downlink reference signal and the transmission time of the uplink reference signal and a group delay for the downlink receive beam and/or the uplink transmit beam retrieved from the first lookup table. ### Claim 64 (depends on 63) The method of claim 63, further comprising: receiving, from the UE, an identifier associated with the downlink receive beam. ### Claim 65 (depends on 63) The method of claim 63, further comprising: receiving, from the UE, a second lookup table or an identifier of the second lookup table, wherein the second lookup table represents per-frequency group delay information for the uplink transmit beam, and wherein the first lookup table represents the per-frequency group delay information for the downlink receive beam. ### Claim 66 (depends on 65) The method of claim 65, further comprising: receiving, from the UE, an identifier associated with the downlink receive beam; and receiving, from the UE, an identifier associated with the uplink transmit beam. ### Claim 67 (depends on 66) The method of claim 66, further comprising: transmitting, to the UE, an identification of a second at least one downlink reference signal resource to enable the UE to receive, before reception of the first downlink reference signal, a second downlink reference signal on the second at least one downlink reference signal resource using the downlink receive beam. ### Claim 68 (depends on 67) The method of claim 67, wherein: the second downlink reference signal is a quasi-collocation source reference signal for the first downlink reference signal, and the identifier associated with the downlink receive beam is an identifier of the second downlink reference signal. ### Claim 69 (depends on 67) The method of claim 67, wherein: the second downlink reference signal is a spatial relation reference downlink reference signal for the uplink reference signal, and the identifier associated with the uplink transmit beam is an identifier of the second downlink reference signal. ### Claim 70 (depends on 65) The method of claim 65 wherein the second lookup table comprises only differences between the first lookup table and the second lookup table. ### Claim 71 (depends on 63) The method of claim 63, wherein the first lookup table is received before transmission to the UE of the identification of the at least one downlink reference signal resource. ### Claim 72 (depends on 63) The method of claim 63, wherein the network entity is the TRP or a location server. ### Claim 73 A user equipment (UE), comprising: means for receiving, from a transmission-reception point (TRP), a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam; means for transmitting, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam; means for determining a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal; means for transmitting the parameter to a positioning entity; and means for transmitting, to the positioning entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam. ### Claim 74 A network entity, comprising: means for transmitting, to a user equipment (UE), an identification of at least one downlink reference signal resource to enable the UE to receive, from a transmission-reception point (TRP), a first downlink reference signal on the at least one downlink reference signal resource using a downlink receive beam; means for transmitting, to the UE, an identification of at least one uplink reference signal resource to enable the UE to transmit, to the TRP, an uplink reference signal on the at least one uplink reference signal resource using an uplink transmit beam; means for receiving, from the UE, a parameter representing a difference between a reception time at the UE of the first downlink reference signal and a transmission time of the uplink reference signal from the UE; means for receiving, from the UE, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam; and means for estimating a position of the UE based, in part, on the difference between the reception time of the first downlink reference signal and the transmission time of the uplink reference signal and a group delay for the downlink receive beam and/or the uplink transmit beam retrieved from the first lookup table. ### Claim 75 A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to: receive, from a transmission-reception point (TRP), a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam; transmit, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam; determine a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal; transmit the parameter to a positioning entity; and transmit, to the positioning entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam. ### Claim 76 A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a network entity, cause the network entity to: transmit, to a user equipment (UE), an identification of at least one downlink reference signal resource to enable the UE to receive, from a transmission-reception point (TRP), a first downlink reference signal on the at least one downlink reference signal resource using a downlink receive beam; transmit, to the UE, an identification of at least one uplink reference signal resource to enable the UE to transmit, to the TRP, an uplink reference signal on the at least one uplink reference signal resource using an uplink transmit beam; receive, from the UE, a parameter representing a difference between a reception time at the UE of the first downlink reference signal and a transmission time of the uplink reference signal from the UE; receive, from the UE, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam; and estimate a position of the UE based, in part, on the difference between the reception time of the first downlink reference signal and the transmission time of the uplink reference signal and a group delay for the downlink receive beam and/or the uplink transmit beam retrieved from the first lookup table.