# US 11,909,497 B2 · Indicating user equipment (UE) polorization tracking capacity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,497 B2 - Document ID: US11909497B2 - Status: Granted - Kind: B2 - Application number: 17/278,311 - Filed: 2019-09-26 - Published: 2022-02-03 - Granted: 2024-02-20 - Earliest claimed: 2018-09-28 - Assignees: Sony Group Corporation - Applicants: Sony Group Corporation - Inventors: Erik Bengtsson; Olof Zander; Fredrik Rusek - Web page: https://patentgrep.com/patent/US11909497B2 ## CPC - H04B 7/10: Polarisation diversity; Directional diversity - H04B 7/088: {using beam selection} - H04B: TRANSMISSION ## Abstract A method (20) performed by a wireless terminal (10) in a wireless communication network (10, 30) is provided. In the method (20), based on a (fundamental) polarization tracking capability of the wireless terminal (10), at least one downlink polarization of at least one downlink communication between the wireless terminal (10) and an access node (30) of the wireless communication network (10, 30) is determined (204). A reference polarization from the at least one downlink polarization is selected (207). Based on the reference polarization and a (momentary) polarization tracking ability of the wireless terminal (10), at least one uplink polarization of at least one uplink communication between the wireless terminal (10) and the access node (30) is configured (210). A corresponding method (40) performed by the access node (30) is also provided, as well as the mentioned wireless terminal (10) and the access node (30). ## Claims ### Claim 1 A method performed by a wireless terminal in a wireless communication network, the method comprising: using a polarization tracking capability of the wireless terminal, determining at least one downlink polarization of at least one downlink communication between the wireless terminal and an access node of the wireless communication network; selecting a reference polarization from the at least one downlink polarization determined using the polarization tracking capability; and based on the reference polarization and a polarization tracking ability of the wireless terminal, configuring at least one uplink polarization of at least one uplink communication between the wireless terminal and the access node. ### Claim 2 (depends on 1) The method of claim 1, further comprising transmitting, to the access node, a first indication of the polarization tracking capability of the wireless terminal. ### Claim 3 (depends on 1) The method of claim 1, further comprising receiving, from the access node, a trigger for activation of the polarization tracking capability of the wireless terminal; and in response to receiving the trigger, activating the polarization tracking capability of the wireless terminal. ### Claim 4 (depends on 1) The method of claim 1, the at least one downlink polarization comprising at least one polarization of at least one polarization-controlled downlink signal dedicated to the wireless terminal. ### Claim 5 (depends on 1) The method of claim 1, the at least one downlink polarization comprising at least one polarization of at least one polarization-multiplexed downlink broadcast signal. ### Claim 6 (depends on 1) The method of claim 1, the at least one downlink polarization comprising at least one polarization of a polarization-controlled pilot signal. ### Claim 7 (depends on 1) The method of claim 1, further comprising receiving, from the access node, a second indication of the reference polarization to be selected from the at least one downlink polarization, the selecting being performed in accordance with the reference polarization. ### Claim 8 (depends on 1) The method of claim 1, further comprising receiving, from the access node, a third indication of at least one polarization offset of the at least one uplink polarization with respect to the reference polarization, the configuring being performed in accordance with the at least one polarization offset. ### Claim 9 (depends on 8) The method of claim 8, the at least one polarization offset being less than a predefined threshold. ### Claim 10 A method performed by an access node in a wireless communication network, the method comprising: configuring at least one downlink polarization of at least one downlink communication between a wireless terminal of the wireless communication network and the access node; selecting a reference polarization from the at least one downlink polarization; determining at least one uplink polarization of at least one uplink communication between the wireless terminal and the access node; and based on the at least one uplink polarization and the reference polarization, determining a polarization tracking ability of the wireless terminal. ### Claim 11 (depends on 10) The method of claim 10, further comprising transmitting, to the wireless terminal, a trigger for activation of the polarization tracking capability of the wireless terminal. ### Claim 12 (depends on 10) The method of claim 10, the at least one downlink polarization comprising at least one polarization of a polarization-controlled downlink signal dedicated to the wireless terminal; or the at least one downlink polarization comprising at least one polarization of a polarization-multiplexed downlink broadcast signal. ### Claim 13 (depends on 10) The method of claim 10, the at least one downlink polarization comprising at least one polarization of a polarization-controlled pilot signal. ### Claim 14 (depends on 10) The method of claim 10, further comprising transmitting, to the wireless terminal, a second indication of the reference polarization to be selected from the at least one downlink polarization. ### Claim 15 (depends on 10) The method of claim 10, further comprising determining at least one polarization offset of the at least one uplink polarization with respect to the reference polarization; and transmitting, to the wireless terminal, a third indication of the at least one polarization offset. ### Claim 16 (depends on 15) The method of claim 15, the at least one polarization offset being less than a predefined threshold. ### Claim 17 (depends on 10) The method of claim 10, further comprising based on the polarization tracking ability of the wireless terminal, selecting a decoding configuration for the at least one uplink communication. ### Claim 18 (depends on 10) The method of claim 10, further comprising based on the polarization tracking ability of the wireless terminal, allocating the at least one uplink communication to a polarization-multiplexed spatial beam. ### Claim 19 A wireless terminal, comprising: an antenna array having antenna elements being associated with mutually orthogonal planes of polarization, and a processor being configured for using a polarization tracking capability of the wireless terminal, determining at least one downlink polarization of at least one downlink communication between the wireless terminal and an access node of the wireless communication network; selecting a reference polarization from the at least one downlink polarization determined using the polarization tracking capability; and based on the reference polarization and a polarization tracking ability of the wireless terminal, configuring at least one uplink polarization of at least one uplink communication between the wireless terminal and the access node. ### Claim 20 An access node, comprising an antenna array having antenna elements being associated with mutually orthogonal planes of polarization, and a processor being configured for configuring at least one downlink polarization of at least one downlink communication between a wireless terminal of the wireless communication network and the access node; selecting a reference polarization from the at least one downlink polarization; determining at least one uplink polarization of at least one uplink communication between the wireless terminal and the access node; and based on the at least one uplink polarization and the reference polarization, determining a polarization tracking ability of the wireless terminal.