# US 11,451,982 B2 · Receiver beamforming for serving and neighbor cell measurements > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,982 B2 - Document ID: US11451982B2 - Status: Granted - Kind: B2 - Application number: 16/986,925 - Filed: 2020-08-06 - Published: 2020-11-19 - Granted: 2022-09-20 - Earliest claimed: 2017-06-23 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Sumeeth Nagaraja; Raghu Narayan Challa; Ruhua He; Arvind Vardarajan Santhanam; Yong Li; Muhammad Nazmul Islam; Bilal Sadiq; Tao Luo - Web page: https://patentgrep.com/patent/US11451982B2 ## CPC - H04W 24/02: Arrangements for optimising operational condition - H04B 7/0408: using two or more beams, i.e. beam diversity - H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04B 7/086: {using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming} - H04B 7/088: {using beam selection} - H04W 36/304: {due to measured or perceived resources with higher communication quality} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/12: Wireless traffic scheduling - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract Aspects of the present disclosure relate to receiver beamforming for serving and neighbor cell measurements. An exemplary method generally includes communicating with one or more base stations using a first beam type, initiating a transition to communicating with at least one of the one or more base stations using a second beam type in response to an indication of a trigger event, and communicating with the at least one of the one or more base stations using the second beam type. ## Claims ### Claim 1 A method of wireless communication at a user equipment (UE), comprising: communicating with a target base station using an omni-directional or pseudo omni-directional beam type; receiving an indication of a trigger event comprising an indication of a handoff from a serving base station to the target base station; and in response to receiving the indication, initiating a transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using a directional beam type and communicating with the target base station using the directional beam type. ### Claim 2 (depends on 1) The method of claim 1, further comprising communicating with the serving base station using the omni-directional or pseudo omni-directional beam type, wherein: communicating with the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type comprises: measuring reference signals of the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type. ### Claim 3 (depends on 2) The method of claim 2, wherein initiating the transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using the directional beam type comprises initiating a beam refinement procedure for communication between the UE and the target base station. ### Claim 4 (depends on 3) The method of claim 3, wherein initiating the beam refinement procedure for communication between the UE and the target base station comprises selecting a first number of beams to perform the refinement procedure on. ### Claim 5 (depends on 4) The method of claim 4, wherein the selecting the first number of beams is based on a signal quality associated with the first number of beams. ### Claim 6 (depends on 4) The method of claim 4, wherein: the indication of the handoff comprises beam information indicating a number of beams to perform the beam refinement procedure on, and the first number of beams is selected based on the beam information. ### Claim 7 (depends on 1) The method of claim 1, further comprising, measuring reference signals of the serving base station using the directional beam type, wherein communicating with the target base station using the omni-directional or pseudo omni-directional beam type comprises measuring reference signals of the target base station using the omni-directional or pseudo omni-directional beam type. ### Claim 8 (depends on 7) The method of claim 7, further comprising applying a fixed offset to the measurements of the reference signals of the target base station relative to the measurements of the reference signals of the serving base station. ### Claim 9 An apparatus for wireless communication by a user equipment (UE), comprising: at least one processor configured to: communicate with a target base station using a omni-directional or pseudo omni-directional beam type; receive an indication of a trigger event comprising an indication of a handoff from a serving base station to the target base station; and in response to receiving the indication, initiate a transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using a directional beam type and communicate with the target base station using the directional beam type; and a memory coupled with the at least one processor. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein: the at least one processor is further configured to communicate with the serving base station using the omni-directional or pseudo omni-directional beam type, and in order to communicate with the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type, the at least one processor is further configured to measure reference signals of the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein, in order to initiate the transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using the directional beam type, the at least one processor is further configured to initiate a beam refinement procedure for communication between the UE and the target base station. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein, in order to initiate the beam refinement procedure for communication between the UE and the target base station, the at least one processor is further configured to select a first number of beams to perform the refinement procedure on. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the at least one processor is configured to select the first number of beams based on a signal quality of the first number of beams. ### Claim 14 (depends on 12) The apparatus of claim 12, wherein: the indication of the handoff comprises beam information indicating a number of beams to perform the beam refinement procedure on, and the first number of beams is selected based on the beam information. ### Claim 15 (depends on 9) The apparatus of claim 9, wherein: the at least one processor is further configured to measure reference signals of the serving base station using the omni-directional or pseudo omni-directional beam type, and in order to communicate with the target base station using the directional beam type, the at least one processor is further configured to measure reference signals of the target base station using the directional beam type. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the at least one processor is further configured to apply a fixed offset to the measurements of the reference signals of the target base station relative to the measurements of the reference signals of the serving base station. ### Claim 17 An apparatus for wireless communication by a user equipment (UE), comprising: means for communicating with a target base station using a omni-directional or pseudo omni-directional beam type; means for receiving an indication of a trigger event comprising an indication of a handoff from a serving base station to the target base station; and means for, in response to receiving the indication, initiating a transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using a directional beam type and communicating with the target base station using the directional beam type. ### Claim 18 (depends on 17) The apparatus of claim 17, further comprising means for communicating with the serving base station using the omni-directional or pseudo omni-directional beam type, wherein the means for communicating with the serving base station using the omni-directional or pseudo omni-directional beam type and the means for communicating with target base station using the omni-directional or pseudo omni-directional beam type comprise means for measuring reference signals of the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the means for initiating the transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using the directional beam type comprises means for initiating a beam refinement procedure for communication between the UE and the target base station. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the means for initiating the beam refinement procedure for communication between the UE and the target base station comprises means for selecting a first number of beams to perform the refinement procedure on. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the means for selecting the first number of beams is based on a signal quality associated with the first number of beams. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein: the indication of the handoff comprises beam information indicating a number of beams to perform the beam refinement procedure on, and the first number of beams is selected based on the beam information. ### Claim 23 A non-transitory computer-readable medium for wireless communication by a user equipment (UE), comprising instructions that, when executed by at least one processor, cause the at least one processor to: communicate with a serving base station and a target base station using a omni-directional or pseudo omni-directional beam type; receive an indication of a trigger event comprising an indication of a handoff from a serving base station to the target base station; and in response to receiving the indication, initiate a transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using a directional beam type and communicate with the target base station using the directional beam type. ### Claim 24 (depends on 23) The non-transitory computer-readable medium of claim 23, further comprising instructions that cause the at least one processor to communicate with the serving base station using the omni-directional or pseudo omni-directional beam type, wherein the instructions that cause the at least one processor to communicate with the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type comprise instructions that cause the at least one processor to measure reference signals of the serving base station and the target base station using the omni-directional or pseudo omni-directional beam type. ### Claim 25 (depends on 24) The non-transitory computer-readable medium of claim 24, wherein the instructions that cause the at least one processor to initiate the transition from communicating with the target base station using the omni-directional or pseudo omni-directional beam type to communicating with the target base station using the directional beam type comprise instructions that cause the at least one processor to initiate a beam refinement procedure for communication between the UE and the target base station. ### Claim 26 (depends on 25) The non-transitory computer-readable medium of claim 25, wherein the instructions that cause the at least one processor to initiate the beam refinement procedure for communication between the UE and the target base station comprise instructions that cause the at least one processor to select a first number of beams to perform the refinement procedure on. ### Claim 27 (depends on 26) The non-transitory computer-readable medium of claim 26, wherein the selection of the first number of beams is based on a signal quality associated with the first number of beams. ### Claim 28 (depends on 26) The non-transitory computer-readable medium of claim 26, wherein: the indication of the handoff comprises beam information indicating a number of beams to perform the beam refinement procedure on, and the first number of beams is selected based on the beam information.