Abstract
Unlicensed 60 GHz millimeter band has a great potential in industrial Internet of things (IIoT) owing to its continuous large bandwidth. However, the signal transmission in this band suffers from high propagation loss, thus beamforming is adopted to provide directional gain. With the increasing number of beams, beam alignment and tracking in mobility scenario may incur unacceptable latency and overhead, and the existing beam management mechanism is no longer suitable. To reduce the latency and signaling overhead during beam tracking, we propose a fast beam tracking scheme with the help of trajectory prediction and channel monitoring. More specifically, we firstly quantify the beam coherent time to reduce the frequency of beam searching. Then, a two-stage heuristic trajectory prediction and channel monitoring aided fast beam tracking scheme is proposed to obtain the optimal beam pairs in the process of terminal movement and make sure that the interference on the directional beam is under the limit. Simulation results verify the effectiveness of the beam coherent time and the advantages of the proposed scheme in terms of complexity, outage probability, and effective spectrum efficiency.
Highlights
With the development of wireless communication system, the industrial revolution is on the way
The optimal beam pairs can be selected by joint directional Listen before talk (LBT) and beam training algorithm designed in TCFBT scheme
Assume each UE moves with a constant speed 1 m/s and the trajectory are generated by random walk model
Summary
With the development of wireless communication system, the industrial revolution is on the way. With the use of larger antenna array and narrower beams at unlicensed 60 GHz spectrum, a higher latency and signaling overhead of the beam tracking will be caused by the increasing of the number of beams. To deal with this problem, in addition to reducing the complexity of the beam tracking algorithm, a suitable beam switching time should be found to minimize the signaling overhead. We propose a two-stage heuristic TCFBT scheme to ensure the fairness and availability of the beams for 5G mobile terminal in unlicensed 60 GHz. In other words, a Gaussian process-based sector predict algorithm is adopted to determine the corresponding sectors at the transceivers in the first stage.
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