Methods, apparatuses and systems for reference signal transmission for intelligent reflection surface installed user equipment channel estimation

A method comprising:

• transmitting, at a wireless communication node, a plurality of first signals comprising a first subset of first signals and a second subset of first signals to a wireless communication device coupled to an Intelligent Reflecting Surface (IRS), wherein at least one of the following parameters is different between the first subset of first signals and the second subset of first signals:
• a transmit power, a pulse-width, an inter-pulse-interval (IPI), and a pulse-repeat rate (PRR);
• receiving, at the wireless communication node, a plurality of second signals generated by the IRS, wherein the plurality of second signals is generated by reflecting the second subset of first signals based on a first angle of arrival (AoA) measured using the first subset of first signals, and wherein the plurality of second signals is used to perform a channel estimation between the wireless communication device and the wireless communication node.

(canceled)

19-20. (canceled)