The terahertz (THz) link provides over 100 Gb/s of data transmission rate. However, it is extremely vulnerable to obstacles and requires very narrow (highly directional) beams for highly focused energy radiation. The main task of THz medium access control (MAC) protocol is not channel access collision avoidance; instead, it is to coordinate all the one-hop neighbors for scheduled, antenna-aligned line-of-sight communications. This study aims to build an intelligent MAC scheme for highly mobile THz airborne networks (TANs). Our TAN MAC design has three features as follows. Spatio-temporal TAN state learning: We will build a predictive network state estimation model through deep learning and generative adversarial network. Based on the predicted node/link status, all the one-hop neighbors can prepare well for the antenna alignment and THz channel scheduling. Accurate, two-level MAC operation control: We propose to use nested deep reinforcement learning with outer/inner policy loops for high-/low-level action determination: The outer loop determines the high level, coarse actions (such as antenna codebook selection); the inner loop determines the low-level, fine actions (such as individual beam control) under the selected high-level action. TAN-specific, comprehensive MAC behavior control: Based on the aforementioned deep neighbor adaptation model, we design a complete TAN MAC protocol that considers the routing context and dynamic network topology. Our simulations demonstrate the smooth, high-rate THz communications in MAC layer with resilient RF links under high node mobility.


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    Title :

    Intelligent Terahertz Medium Access Control (MAC) for Highly Dynamic Airborne Networks


    Contributors:
    He, Linsheng (author) / Hu, Fei (author) / Chu, Zhe (author) / Zhao, Jiamiao (author) / Sagduyu, Yalin (author) / Thawdar, Ngwe (author) / Kumar, Sunil (author)


    Publication date :

    2023-06-01


    Size :

    5814092 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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