Terrestrial Air Interface Design

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Terrestrial Air Interface Design

Wang, Michael Mao / Zhang, Jingjing

Both AIS and ASM operate under a distributed medium access control mechanism through ad hoc networking. The advantage is the great flexibility that enables direct communication without the presence of a control station; nevertheless, the disadvantage is also the lack of supervision of control stations that gives rise to frequent collisions among transmitting stations, especially in the high traffic area, such as ports, harbors, and waterways. Collisions cause not only poor overall system efficiency that limits the system capacity but the instability of the system. Both VDE-TER and VDE-SAT are thus designed to alleviate this problem using a centralized resource management mechanism with the benefit of the infrastructure, i.e., the control stations. This chapter provides a practical design of such an air interface that includes a unified network layer, data link layer, and physical layer protocols for operating on the VDES spectrum within the maritime MTC framework outlined in the previous chapters. A unified air interface framework solution for both satellite and terrestrial segments (both under centralized resource management) is one of the important goals of the design. Therefore, although VDE-TER is the primary focus of this chapter, the air interface framework derived in this chapter applies to VDE-SAT, which differs only in configuration parameters by design. A unified framework reduces the complexity and cost of a VDES transceiver and, more importantly, eases the seamless integration of VDES segments, accentuated by spectrum sharing and interference coordination in meeting the unique maritime MTC requirements under the peculiar VDES spectrum assignments as discussed in Chaps. 1 and 6.