I. Introduction
Molecular communication (MC) is a biologically inspired communication paradigm that uses molecules as information carriers. Despite the advancement of the 5G communication system, conventional communication techniques are prohibitive in certain scenarios, such as the communication in the nano/micro-scale ranges and the electro-magnetic (EM) wave denied environments [2]. The size constraint of the EM wave-based transceivers is one of the challenging issues. Though the emerging Terahertz communication techniques have the potential to tackle this problem, its bio-compatibility problem is not yet solved [3]. Alternatively, the MC mechanism is recognized by the communication community as a reliable and safe communication paradigm in micro-scale scenarios as it is widely adopted in nature [4]. Besides, due to its particle nature, it may serve as an alternative communication paradigm for information transmission in EM-wave denied environments. Note that the research of MC-related Internet of Things has been growing rapidly in aspects of modulation/demodulation [5], channel model [6], information theory [7], multiple access [8], system security [9], and viral detection methods [10]. To unleash the potential of MC and realize its revolutionary applications, such as targeted drug delivery, efforts of interdisciplinary researchers from both academia and industry are expectant [11].