Abstract
In recent years, low earth orbit (LEO) satellite constellation systems have been developed rapidly. However, the scarcity of satellite spectrum resources has become one of the major obstacles to this trend. LEO satellite constellation communication systems sharing the spectrum of incumbent geostationary earth orbit (GEO) satellite system is a feasible way to alleviate spectrum scarcity. Therefore, it has practical significance to study the optimization of satellite resources allocation (RA) in a spectrum sharing scenario. This paper focuses on the RA problem that LEO satellites share a GEO high throughput satellite’s spectrum in a beam-hopping (BH) manner. The GEO satellite system is served as the primary system and the LEO satellite constellation system is served as the secondary system whose frequency bands and transmitting power are strictly limited. Compared with conventional multibeam satellites, BH satellites have the advantage of flexibility in the time dimension. Therefore, we make full use of the flexibility of LEO BH satellites to realize the matching of traffic demand and traffic supply. The RA problem is decomposed into three sub-problems, namely, frequency band selection (FBS) problem, illuminated cell selection (ICS) problem, and transmitting power allocation (TPA) problem. We solve each sub-problem in order and finally form a complete RA scheme. The performance evaluation of the proposed RA scheme is carried out in real-time and simulation results show that the LEO BH satellite paired with the RA scheme we proposed has good adaptability to the uneven distribution of traffic demand in the spectrum sharing scenario.
Highlights
Low earth orbit (LEO) satellite constellation systems, such as OneWeb [1], SpaceX [2], and Telesat [3] systems, can provide broadband Internet access services for areas with underdeveloped telecommunication infrastructure
Our research focuses on resource allocation (RA) where the LEO satellite constellation system with the BH scheme shares the spectrum of the geostationary earth orbit (GEO) satellite system with the multibeam scheme
NUMERICAL RESULTS the resources allocation (RA) performance of the LEO satellite constellation system we proposed in the scenario of sharing spectrum with the GEO satellite system is presented
Summary
Low earth orbit (LEO) satellite constellation systems, such as OneWeb [1], SpaceX [2], and Telesat [3] systems, can provide broadband Internet access services for areas with underdeveloped telecommunication infrastructure. An LEO satellite constellation system is considered as a secondary system to share the spectrum resources of a GEO high throughput satellite communication system. The LEO satellite constellation system shares the spectrum of the GEO satellite system in the downlink, and the in-line interference occurs in low latitudes. In order to avoid harmful interference to the primary system, the transmitting power, frequency band usage, and illuminated beams of the LEO satellite will be strictly limited. In this scenario, it is meaningful to optimize the RA of the LEO satellite constellation system. Let Nc denotes the cell number of the coverage area; Rg and Rl denote the beam coverage radius of the GEO satellite system and the cell radius (equals to the spotbeam coverage radius) of the LEO satellite system respectively; Hg denotes the orbit height of the GEO satellite, and it is equal to 35786km; Hl denotes the orbit height of LEO satellite; Sglon, 0 denotes the longitude and latitude of the GEO satellite; Sll(otn), Sll(att) denotes the longitude and latitude of the LEO satellite at time t; Cll,oin, Cll,ait denotes the longitude and latitude of the ith cell’s center of the coverage area; Cglo,jn, Cgla,jt denotes the longitude and latitude of the th beam’s center of the GEO satellite; Btot denotes the shared spectrum, which is divided into Fu sub-bands f1, f2, . . . , fFu , and Fu denotes the frequency reuse factor of the GEO satellite system
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