A Fast Beam Training Method for 5G New Radio.

Millimeter wave communication requires a highly directional transmission link between the base station and the user equipment, which may increase the time of initial access and affect the experience of delay-sensitive users. Considering the initial access technique based on analog beamforming, this paper proposes a fast beam training method for random combination of beam pairs. The method first divides the beam directions of the base station and the user into several groups, and then randomly selects beams from both groups to determine whether it meets the requirement for establishing a link. If so, the algorithm stops the search, otherwise it continues to select beams randomly from the remaining part until a proper beam pair is found. This paper first introduces the beam training process of random combination method, and then compares it with exhaustive method and iterative method in terms of discover delay and misdetection probability. Simulation results show that the random combination method can effectively reduce discover delay and shorten the initial access time.