# US 2021/0345260 A1 · Applying zero element beam in search and measurement procedure for power savings in mmw > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345260 A1 - Document ID: US20210345260A1 - Status: Published application - Kind: A1 - Application number: 17/238,098 - Filed: 2021-04-22 - Published: 2021-11-04 - Earliest claimed: 2020-04-29 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jun ZHU; Yongle WU; Jafar MOHSENI; Raghu Narayan CHALLA - Web page: https://patentgrep.com/patent/US20210345260A1 ## CPC - H04J 11/0069: {Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655)} - H04W 56/001: {Synchronization between nodes} - H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group} - H04J 11/0076: {Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group} - H04J 11/0079: {Acquisition of downlink reference signals, e.g. detection of cell-ID} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 52/365: {Power headroom reporting} - H04W 52/52: using AGC [Automatic Gain Control] circuits or amplifiers - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04B 7/088: {using beam selection} - Y02D 30/70: in wireless communication networks - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for applying a zero element beam to conserve power in search and measurement operations of a UE. The UE may determine to measure a set of SSBs, where each SSB of the set of SSBs is transmitted on four symbols, and further determine a subset of the SSBs for which less than the four symbols associated with the SSBs are to be used for measurement of the SSBs. The UE may measure each SSB of the subset of the SSBs through less than the four symbols associated with the SSB. ## Claims ### Claim 1 A method of wireless communication of a user equipment (UE), comprising: determining to measure a set of synchronization signal blocks (SSBs), each SSB of the set of SSBs transmitted on four symbols; determining a subset of SSBs of the set of SSBs for which less than the four symbols associated with the SSBs are to be used for measurement of the SSBs; and measuring each SSB of the subset of the SSBs through less than the four symbols associated with the SSB. ### Claim 2 (depends on 1) The method of claim 1, wherein the set of SSBs are determined to include SSBs associated with a cell search and to exclude SSBs that are undetected based on a cell search. ### Claim 3 (depends on 1) The method of claim 1, wherein the SSBs in the subset of SSBs are associated with at least one of: a serving cell measurement; a neighbor cell measurement; or at least one of a time tracking loop (TTL), a frequency tracking loop (FTL), or an automatic gain control (AGC) loop. ### Claim 4 (depends on 1) The method of claim 1, wherein the less than the four symbols comprises x symbols, where x<4, each SSB of the subset of the SSBs includes a first subset of symbols including the x symbols and a second subset of symbols including remaining symbols of each SSB, the remaining symbols including y symbols, where y=4−x. ### Claim 5 (depends on 4) The method of claim 4, further comprising reducing a receiving power on at least one receiver at the UE for receiving symbols within the second subset of symbols. ### Claim 6 (depends on 5) The method of claim 5, wherein the receiving power is reduced on the at least one receiver at the UE when connected mode discontinuous reception (CDRX) is off at the UE. ### Claim 7 (depends on 5) The method of claim 5, further comprising receiving an SSB measurement timing configuration (SMTC), wherein the receiving power is reduced on the at least one receiver at the UE when the second subset of symbols is within an SMTC window based on the received SMTC, and when connected mode discontinuous reception (CDRX) is on at the UE or the UE is in a radio resource control (RRC) connected state. ### Claim 8 (depends on 1) The method of claim 1, further comprising determining a number of symbols less than four for measuring each SSB of the subset of SSBs, wherein each SSB of the set of SSBs is measured based on the determined number of symbols for the SSB. ### Claim 9 (depends on 8) The method of claim 8, wherein: for SSBs in the subset of SSBs associated with a serving cell measurement, the number of symbols is one, the one symbol including a secondary synchronization signal (SSS); for SSBs in the subset of SSBs associated with a neighbor cell measurement, the number of symbols is three, the three symbols including two symbols for physical broadcast channels (PBCHs) and one symbol for the SSS; or for SSBs in the subset of SSBs associated with at least one of a time tracking loop (TTL), a frequency tracking loop (FTL), or an automatic gain control (AGC) loop, the number of symbols is three, the three symbols including two symbols for the PBCHs and one symbol for the SSS. ### Claim 10 (depends on 1) The method of claim 1, wherein the determining the subset of the SSBs comprises determining that one or more SSBs of the set of SSBs is associated with a serving cell measurement, wherein the subset of the SSBs is determined to include the determined one or more SSBs associated with the serving cell measurement, and wherein the one or more SSBs are measured based on one symbol associated with a secondary synchronization signal (SSS). ### Claim 11 (depends on 1) The method of claim 1, wherein the determining the subset of the SSBs comprises determining that one or more SSBs of the set of SSBs is associated with a neighbor cell measurement, wherein the subset of the SSBs is determined to include the determined one or more SSBs associated with the neighbor cell measurement, and wherein the one or more SSBs are measured based on three symbols including two symbols for physical broadcast channels (PBCHs) and one symbol for a secondary synchronization signal (SSS). ### Claim 12 (depends on 1) The method of claim 1, wherein the determining the subset of the SSBs comprises determining that one or more SSBs of the set of SSBs is associated with at least one of a time tracking loop (TTL), a frequency tracking loop (FTL), or an automatic gain control (AGC) loop, wherein the subset of the SSBs is determined to include the determined one or more SSBs associated with the at least one of the TTL, FTL, or AGC, and wherein the one or more SSBs are measured based on three symbols including two symbols for physical broadcast channels (PBCHs) and one symbol for a secondary synchronization signal (SSS). ### Claim 13 An apparatus for wireless communication at a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: determine to measure a set of synchronization signal blocks (SSBs), each SSB of the set of SSBs transmitted on four symbols; determine a subset of SSBs of the set of SSBs for which less than the four symbols associated with the SSBs are to be used for measurement of the SSBs; and measure each SSB of the subset of the SSBs through less than the four symbols associated with the SSB. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the set of SSBs are determined to include SSBs associated with a cell search and to exclude SSBs that are undetected based on a cell search. ### Claim 15 (depends on 13) The apparatus of claim 13, wherein the SSBs in the subset of SSBs are associated with at least one of: a serving cell measurement; a neighbor cell measurement; or at least one of a time tracking loop (TTL), a frequency tracking loop (FTL), or an automatic gain control (AGC) loop. ### Claim 16 (depends on 13) The apparatus of claim 13, wherein the less than the four symbols comprises x symbols, where x<4, each SSB of the subset of the SSBs includes a first subset of symbols including the x symbols and a second subset of symbols including remaining symbols of each SSB, the remaining symbols including y symbols, where y=4−x. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the at least one processor is further configured to reduce a receiving power on at least one receiver at the UE for receiving symbols within the second subset of symbols. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the receiving power is reduced on the at least one receiver at the UE when connected mode discontinuous reception (CDRX) is off at the UE. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the at least one processor is further configured to receive an SSB measurement timing configuration (SMTC), wherein the receiving power is reduced on the at least one receiver at the UE when the second subset of symbols is within an SMTC window based on the received SMTC, and when connected mode discontinuous reception (CDRX) is on at the UE or the UE is in a radio resource control (RRC) connected state. ### Claim 20 (depends on 13) The apparatus of claim 13, wherein the at least one processor is further configured to determine a number of symbols less than four for measuring each SSB of the subset of SSBs, wherein each SSB of the set of SSBs is measured based on the determined number of symbols for the SSB. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein: for SSBs in the subset of SSBs associated with a serving cell measurement, the number of symbols is one, the one symbol including a secondary synchronization signal (SSS); for SSBs in the subset of SSBs associated with a neighbor cell measurement, the number of symbols is three, the three symbols including two symbols for physical broadcast channels (PBCHs) and one symbol for the SSS; or for SSBs in the subset of SSBs associated with at least one of a time tracking loop (TTL), a frequency tracking loop (FTL), or an automatic gain control (AGC) loop, the number of symbols is three, the three symbols including two symbols for the PBCHs and one symbol for the SSS. ### Claim 22 (depends on 13) The apparatus of claim 13, wherein to determine the subset of the SSBs the at least one processor is further configured to determine that one or more SSBs of the set of SSBs is associated with a serving cell measurement, wherein the subset of the SSBs is determined to include the determined one or more SSBs associated with the serving cell measurement, and wherein the one or more SSBs are measured based on one symbol associated with a secondary synchronization signal (SSS). ### Claim 23 (depends on 13) The apparatus of claim 13, wherein to determine the subset of the SSBs the at least one processor is further configured to determine that one or more SSBs of the set of SSBs is associated with a neighbor cell measurement, wherein the subset of the SSBs is determined to include the determined one or more SSBs associated with the neighbor cell measurement, and wherein the one or more SSBs are measured based on three symbols including two symbols for physical broadcast channels (PBCHs) and one symbol for a secondary synchronization signal (SSS). ### Claim 24 (depends on 13) The apparatus of claim 13, wherein to determine the subset of the SSBs the at least one processor is further configured to determine that one or more SSBs of the set of SSBs is associated with at least one of a time tracking loop (TTL), a frequency tracking loop (FTL), or an automatic gain control (AGC) loop, wherein the subset of the SSBs is determined to include the determined one or more SSBs associated with the at least one of the TTL, FTL, or AGC, and wherein the one or more SSBs are measured based on three symbols including two symbols for physical broadcast channels (PBCHs) and one symbol for a secondary synchronization signal (SSS). ### Claim 25 An apparatus for wireless communication at a user equipment (UE), comprising: means for determining to measure a set of synchronization signal blocks (SSBs), each SSB of the set of SSBs transmitted on four symbols; means for determining a subset of SSBs of the set of SSBs for which less than the four symbols associated with the SSBs are to be used for measurement of the SSBs; and means for measuring each SSB of the subset of the SSBs through less than the four symbols associated with the SSB. ### Claim 26 A computer-readable medium storing computer executable code, the code when executed by at least one processor causes the at least one processor to: determine to measure a set of synchronization signal blocks (SSBs), each SSB of the set of SSBs transmitted on four symbols; determine a subset of SSBs of the set of SSBs for which less than the four symbols associated with the SSBs are to be used for measurement of the SSBs; and measure each SSB of the subset of the SSBs through less than the four symbols associated with the SSB.