Applicability of DCA in HAPS-based Systems in 5850–7075 MHz Band

Abstract

The High Altitude Platform System (HAPS) which will provide a worldwide connectivity in wireless networks operates in 5850–7075 MHz spectrum endorsing the safety of primary services such as terrestrial systems (TS). The suppleness and innate characteristics of HAPS made it a trustable system that can adapt itself to operate as a secondary system in this allotment. To efficiently develop the restricted resources of the radio spectrum, the spectrum has to be divided into sub-channels to be reused. This paper offers the status of a feasibility study on the Dynamic Channel Assignment (DCA) in the mentioned band. In contrast to other mitigation techniques, the DCA technique is likely to evade either causing or accepting interference from/to TS by seeking for a part of a spectrum that is vacant so far; hence, sensing carriers transmitted from TS is the most critical issue in this technique. In this paper, a computer simulation is dispensed to assess the effect of deploying the HAPS as a secondary activated system that shares the band with TS. The paper utilizes the DCA scheme to mitigate the interference caused by HAPS into TS in order to share the spectrum between the two services. Additionally, the possibility of assigning DCA and the ability of sensing signal a victim time by the HAPS gateway (HAPSGS) with separation distance of up. 6 km is proven In order to enhance the DCA performance, the sensing threshold level is diminished from 1dB to 0.3 dB. Accordingly, the feasibility of DCA improved from 6 km to 7 km far from the urban edge of coverage (EOC) area of HAPS.