Analytical Study of Beam Searching Procedure with Standard and Optimized Discontinuous Silent Mode in Directional Communications

Directional communications consume much User Equipment (UE) battery energy due to its specific Radio Frequency (RF) unit and computational resources. The Discontinuous Reception (DRX) silent mode is presented in 4G Long Term Evolution-Advanced (LTE-A) and 5G New Radio (5G NR) networks with two forms. The first form is the standard DRX silent mode which fixes the frame size and the second one is the optimized DRX silent mode which proposes a flexible frame size to face the extreme data traffic. Then, the beam searching duration will be influenced. A series of experiments is done to assess the performance of each form in both 4G LTE-A and 5G NR networks. A MATLAB simulation program is used to verify the system model and the numerical analysis. Power Saving Ratio (PSR) and Average Waiting Delay (E(D)) are measured. Then, precise analytical results with enhancement values are provided in the paper context.