US 12,452,703 B2
Method for signal optimization between user equipment and reconfigurable intelligence surface
Chao-Kai Wen, Kaohsiung (TW); Feng-Ji Chen, Kaohsiung (TW); Tzu-Hao Huang, Kaohsiung (TW); De-Ming Chian, Kaohsiung (TW); and Chuan-Yuan Wang, Kaohsiung (TW)
Assigned to NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung (TW)
Filed by NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung (TW)
Filed on May 5, 2023, as Appl. No. 18/143,704.
Claims priority of application No. 112104829 (TW), filed on Feb. 10, 2023.
Prior Publication US 2024/0276240 A1, Aug. 15, 2024
Int. Cl. H04W 24/00 (2009.01); H04L 43/065 (2022.01); H04W 24/02 (2009.01)
CPC H04W 24/02 (2013.01) [H04L 43/065 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for signal optimization between a user equipment and a reconfigurable intelligence surface (RIS), with the reconfigurable intelligence surface coupled with the user equipment through a plurality of reflecting units of the reconfigurable intelligence surface, with each of the plurality of reflecting units having a plurality of phases, and with the method having a preset performance threshold value; the method comprising:
a phase combination optimization process, comprising:
a current performance generation step: generating an RIS signal by the reconfigurable intelligence surface according to a current phase combination formed by a current phase of each reflecting unit, receiving the RIS signal by the user equipment, and generating a corresponding performance indicator by a performance evaluation module according to the RIS signal;
a current performance evaluating step: evaluating whether the performance indicator corresponding to the current phase combination is not less than the preset performance threshold value, and continuing to perform a real optimum phase combination determining step or a phase optimization step according to an evaluation result;
the real optimum phase combination determining step: reflecting the corresponding RIS signal by the reconfigurable intelligence surface through the current phase combination to form coupling with the user equipment in a state that the performance indicator is not less than the preset performance threshold value; and
the phase optimization step:
generating at least one modified phase combination corresponding to an applied phase modifying method based on the current phase combination in a state that the performance indicator of the current phase combination is less than the preset performance threshold value,
enabling the combination formed by the phase of each reflecting unit in the current phase combination to be different from the modified phase combination, and evaluating whether a performance indicator corresponding to the modified phase combination is not less than the preset performance threshold value;
defining the modified phase combination to be an optimized phase combination when the performance indicator corresponding to the modified phase combination is not less than the preset performance threshold value;
evaluating whether the performance indicator corresponding to the modified phase combination is greater than the corresponding performance indicator of the current phase combination when the performance indicator corresponding to the modified phase combination is less than the preset performance threshold value so as to determine an optimized phase combination;
and then replacing the optimized phase combination with the current phase combination to become an updated current phase combination;
wherein, by means of said phase optimization step, the performance indicator of the optimized phase combination is ensured not less than the preset performance threshold value or not inferior to the performance indicator of all of the at least one modified phase combination.