Centralized Dynamic Channel Assignment Schemes for Multi-beam Mobile Satellite Communications Systems

Abstract

Satellite and terrestrial integrated mobile communication systems (STICS) have been drawing a significant deal of attention, where a mobile user can connect to either a terrestrial network or a satellite network anytime and anywhere even in the case of natural disasters. A key issue on STICS is frequency sharing by a satellite network and a terrestrial network. One of the promising approaches to share the frequency spectrum is to divide the allocated frequency spectrum into two parts for satellite use and terrestrial use in a dynamic manner according to the traffic demand. In this approach, the spectrum allocated to the satellite networks can be smaller, thus it is strongly required to increase the bandwidth per satellite cell by using smaller frequency reuse factor. However, the smaller frequency reuse factor results in larger inter-cell interference. To solve this problem, this paper proposes two centralized dynamic channel assignment schemes for multi-beam mobile satellite communications systems, i.e. (1) interference measurement based dynamic assignment scheme and (2) location based dynamic channel assignment scheme. It also shows the performance evaluation results by computer simulations regarding the blocking rate and the link quality in terms of C/(N+I). Simulation results confirm that the proposed schemes can reduce the inter-cell interference compared with the conventional scheme.