A method for wireless communications, the method comprising: determining, by a first network controller, a total number of analog transmit beams for a beamforming reference signal, BFRS, determining, by the first network controller, a set of analog beam selection restriction configurations, wherein the analog beam selection restriction configurations indicate a set of analog beams upon which the UE should not derive a digital Channel State Information, CSI, feedback, signaling, by the first network controller to a user equipment, UE, a first set of reference signals, wherein the first set of reference signals is a first set of reference signals among the total number of analog transmit beams for the BFRS; signaling, by the first network controller to the UE, a second set of reference signals, wherein the second set of reference signals is a second set of reference signals among the total number of analog transmit beams for the BFRS; signaling, by the first network controller to the UE, restriction configuration for UE to select reference signals from the first set of reference signals and the second set of reference signals, wherein the restriction configuration includes the set of analog beam selection restriction configurations; and transmitting, to the UE, the first set of reference signals and the second set of reference signals, to select one or more best analog transmit-receive beam pairs comprising a single analog transmit beam for each of the first and second set of reference signals and to derive a baseband CSI feedback of hybrid beamforming, receiving the baseband CSI feedback, by the first network controller from the UE. determining, by a first network controller, a total number of analog transmit beams for a beamforming reference signal, BFRS, determining, by the first network controller, a set of analog beam selection restriction configurations, wherein the analog beam selection restriction configurations indicate a set of analog beams upon which the UE should not derive a digital Channel State Information, CSI, feedback, signaling, by the first network controller to a user equipment, UE, a first set of reference signals, wherein the first set of reference signals is a first set of reference signals among the total number of analog transmit beams for the BFRS; signaling, by the first network controller to the UE, a second set of reference signals, wherein the second set of reference signals is a second set of reference signals among the total number of analog transmit beams for the BFRS; signaling, by the first network controller to the UE, restriction configuration for UE to select reference signals from the first set of reference signals and the second set of reference signals, wherein the restriction configuration includes the set of analog beam selection restriction configurations; and transmitting, to the UE, the first set of reference signals and the second set of reference signals, to select one or more best analog transmit-receive beam pairs comprising a single analog transmit beam for each of the first and second set of reference signals and to derive a baseband CSI feedback of hybrid beamforming, receiving the baseband CSI feedback, by the first network controller from the UE. <EOS>