# US 2018/0324657 A1 · Predictive beamforming and subarray selection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324657 A1 - Document ID: US20180324657A1 - Status: Published application - Kind: A1 - Application number: 15/925,423 - Filed: 2018-03-19 - Published: 2018-11-08 - Earliest claimed: 2017-05-04 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Junyi LI; Ashwin SAMPATH; Ozge KOYMEN - Web page: https://patentgrep.com/patent/US20180324657A1 ## CPC - H04B 7/0413: MIMO systems - H04B 7/0408: using two or more beams, i.e. beam diversity - H04B 7/0617: {for beam forming} - H04B 7/0691: {using subgroups of transmit antennas} - H04L 2025/03414: {Multicarrier} - H04W 36/0083: {Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists} - H04W 36/302: {due to low signal strength} - H04B: TRANSMISSION - 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 A wireless device of the present disclosure may be able to reduce the time needed to determine a subarray and/or beamforming direction used for mmW communication. An apparatus may maintain first information associated with a correlation between each of a plurality of wireless device orientations and a plurality of nodes, at least one subarray, and a corresponding beamforming direction. The apparatus may communicate with a first node using a first beamforming direction selected from the first information. In certain aspects, the first beamforming direction may be correlated with a first orientation of a first subarray at the wireless device and the first node. The apparatus may perform a handoff procedure from the first node to a second node when a position of the first subarray changes from the first orientation to a second orientation. ## Claims ### Claim 1 A method of wireless communication for a wireless device, comprising: maintaining first information associated with a correlation between each of a plurality of wireless device orientations and a plurality of nodes, at least one subarray, and a corresponding beamforming direction; communicating with a first node using a first beamforming direction selected from the first information, the first beamforming direction being correlated with a first orientation of a first subarray at the wireless device and the first node; and performing a handoff procedure from the first node to a second node when a position of the first subarray changes from the first orientation to a second orientation. ### Claim 2 (depends on 1) The method of claim 1, further comprising: selecting a second beamforming direction for use in communicating with the second node from the first information based at least in part on the second orientation of the first subarray; and communicating with the second node using the second beamforming direction. ### Claim 3 (depends on 2) The method of claim 2, further comprising: determining a first signal strength associated with the first subarray, the first node, and the first beamforming direction; determining a second signal strength associated with a second subarray, the second node, and a second beamforming direction; determining to communicate with the second node using the second subarray and the second beamforming direction based at least in part on the second orientation of the first subarray, the first signal strength, and the second signal strength, wherein the communicating with the second node using the second beamforming direction comprises communicating with the second node using the second beamforming direction and the second subarray. ### Claim 4 (depends on 3) The method of claim 3, further comprising: determining a first correlation between the first orientation of the first subarray, the first node, and the first beamforming direction based at least in part on the first information; and determining a second correlation between the second orientation of the first subarray, the second subarray, the second node, and the second beamforming direction based at least in part on the first information, wherein the determining to communicate with the second node using the second subarray and the second beamforming direction is further based on the second correlation. ### Claim 5 (depends on 2) The method of claim 2, further comprising: determining that the position of the first subarray changes from the first orientation to the second orientation based at least in part on second information obtained from one or more sensors at the wireless device. ### Claim 6 (depends on 5) The method of claim 5, wherein the one or more sensors include at least one gyroscope. ### Claim 7 (depends on 5) The method of claim 5, wherein the second information indicates a change in an angle between the first subarray and the first node. ### Claim 8 (depends on 7) The method of claim 7, wherein the second beamforming direction is selected based at least in part on the first information and the second information. ### Claim 9 (depends on 5) The method of claim 5, wherein the second information indicates an elevation change of the first subarray or an azimuthal change of the first subarray. ### Claim 10 An apparatus for wireless communication for a wireless device, comprising: means for maintaining first information associated with a correlation between each of a plurality of wireless device orientations and a plurality of nodes, at least one subarray, and a corresponding beamforming direction; means for communicating with a first node using a first beamforming direction selected from the first information, the first beamforming direction being correlated with a first orientation of a first subarray at the wireless device and the first node; and means for performing a handoff procedure from the first node to a second node when a position of the first subarray changes from the first orientation to a second orientation. ### Claim 11 (depends on 10) The apparatus of claim 10, further comprising: means for selecting a second beamforming direction for use in communicating with the second node from the first information based at least in part on the second orientation of the first subarray; and means for communicating with the second node using the second beamforming direction. ### Claim 12 (depends on 11) The apparatus of claim 11, further comprising: means for determining a first signal strength associated with the first subarray, the first node, and the first beamforming direction; means for determining a second signal strength associated with a second subarray, the second node, and a second beamforming direction; means for determining to communicate with the second node using the second subarray and the second beamforming direction based at least in part on the second orientation of the first subarray, the first signal strength, and the second signal strength, wherein the means for communicating with the second node using the second beamforming direction is configured to communicate with the second node using the second beamforming direction and the second subarray. ### Claim 13 (depends on 12) The apparatus of claim 12, further comprising: means for determining a first correlation between the first orientation of the first subarray, the first node, and the first beamforming direction based at least in part on the first information; and means for determining a second correlation between the second orientation of the first subarray, the second subarray, the second node, and the second beamforming direction based at least in part on the first information, wherein the means for determining to communicate with the second node using the second subarray and the second beamforming direction is further configured to determine to communicate with the second node based on the second correlation. ### Claim 14 (depends on 11) The apparatus of claim 11, further comprising: means for determining that the position of the first subarray changes from the first orientation to the second orientation based at least in part on second information obtained from one or more sensors at the wireless device. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein the one or more sensors include at least one gyroscope. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein the second information indicates a change in an angle between the first subarray and the first node. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the second beamforming direction is selected based at least in part on the first information and the second information. ### Claim 18 (depends on 14) The apparatus of claim 14, wherein the second information indicates an elevation change of the first subarray or an azimuthal change of the first subarray. ### Claim 19 An apparatus for wireless communication for a wireless device, comprising: a memory; and at least one processor coupled to the memory and configured to: maintain first information associated with a correlation between each of a plurality of wireless device orientations and a plurality of nodes, at least one subarray, and a corresponding beamforming direction; communicate with a first node using a first beamforming direction selected from the first information, the first beamforming direction being correlated with a first orientation of a first subarray at the wireless device and the first node; and perform a handoff procedure from the first node to a second node when a position of the first subarray changes from the first orientation to a second orientation. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the at least one processor is further configured to: select a second beamforming direction for use in communicating with the second node from the first information based at least in part on the second orientation of the first subarray; and communicate with the second node using the second beamforming direction. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the at least one processor is further configured to: determine a first signal strength associated with the first subarray, the first node, and the first beamforming direction; determine a second signal strength associated with a second subarray, the second node, and a second beamforming direction; determine to communicate with the second node using the second subarray and the second beamforming direction based at least in part on the second orientation of the first subarray, the first signal strength, and the second signal strength, wherein the wherein the at least one processor is configured to communicate with the second node using the second beamforming direction by communicating with the second node using the second beamforming direction and the second subarray. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the at least one processor is further configured to: determine a first correlation between the first orientation of the first subarray, the first node, and the first beamforming direction based at least in part on the first information; and determine a second correlation between the second orientation of the first subarray, the second subarray, the second node, and the second beamforming direction based at least in part on the first information, wherein the at least one processor is configured to determine to communicate with the second node using the second subarray and the second beamforming direction based on the second correlation. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein the at least one processor is further configured to: determine that the position of the first subarray changes from the first orientation to the second orientation based at least in part on second information obtained from one or more sensors at the wireless device. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the one or more sensors include at least one gyroscope. ### Claim 25 (depends on 23) The apparatus of claim 23, wherein the second information indicates a change in an angle between the first subarray and the first node. ### Claim 26 (depends on 25) The apparatus of claim 25, wherein the second beamforming direction is selected based at least in part on the first information and the second information. ### Claim 27 (depends on 23) The apparatus of claim 23, wherein the second information indicates an elevation change of the first subarray or an azimuthal change of the first subarray. ### Claim 28 A computer-readable medium storing computer executable code for a wireless device, comprising code to: maintain first information associated with a correlation between each of a plurality of wireless device orientations and a plurality of nodes, at least one subarray, and a corresponding beamforming direction; communicate with a first node using a first beamforming direction selected from the first information, the first beamforming direction being correlated with a first orientation of a first subarray at the wireless device and the first node; and perform a handoff procedure from the first node to a second node when a position of the first subarray changes from the first orientation to a second orientation. ### Claim 29 (depends on 28) The computer-readable medium of claim 28, further comprising code to: select a second beamforming direction for use in communicating with the second node from the first information based at least in part on the second orientation of the first subarray; and communicate with the second node using the second beamforming direction. ### Claim 30 (depends on 29) The computer-readable medium of claim 29, further comprising code to: determine a first signal strength associated with the first subarray, the first node, and the first beamforming direction; determine a second signal strength associated with a second subarray, the second node, and a second beamforming direction; determine to communicate with the second node using the second subarray and the second beamforming direction based at least in part on the second orientation of the first subarray, the first signal strength, and the second signal strength, wherein the code to communicate with the second node using the second beamforming direction is configured to communicate with the second node using the second beamforming direction and the second subarray.