公开(公告)号：US11438044B1

公开(公告)日：2022-09-06

申请号：US17694790

申请日：2022-03-15

Applicant: Nokia Solutions and Networks Oy

Inventor： Olli Juhani Piirainen ,  Jari Vilho Ylioinas

IPC: H04B7/06 ,  H04B7/0456 ,  H04W52/24

Abstract: Solutions to determine how to form beams when co-operating multiple-input multiple-output antenna panels are used are disclosed. Beams are formed according to sets of beamforming weights corresponding to minimized total transmit power from an antenna array of interest to served terminal devices. Optimization to minimize total transmit power subject to a predefined constraint on a minimum allowable expected value of signal-to-interference-plus-noise ratio, SINR, is performed. In the optimization expected values of SINR for a terminal device are calculated based on based on the sets of beamforming weights for at least the served terminal devices, and weighted second order statistics, wherein a weighting factor for second order statistics between the served terminal devices and the antenna array is one and weighting factors for the other second order statistics less than one. The second order statistics are included in maintained channel state information.