Abstract
In recent years, the ultra-dense low Earth orbit (LEO) satellite communication (UD-LSC) networks such as SpaceX and OneWeb are under rapid development to provide worldwide and broadband services. However, the deployment of thousands of LEO satellites into space leads to the shortage of the orbital and the frequency resources. Spectrum sharing between geostationary Earth orbit (GEO) satellite systems and LEO satellite systems seems to be a promising way to alleviate the problem of restricted spectrum resources. In this paper, a joint cooperative beam association and power allocation scheme for the UD-LSC network to share the same spectrum with a GEO satellite system is considered. By exploiting the cooperative transmission between multiple LEO satellites, we first propose a many-to-many match game-based beam association (MGBA) algorithm to obtain a stable matching between LEO satellites and beam cells, and then, we propose a successive convex approximation (SCA)-based power allocation (SPA) algorithm to iteratively acquire the sub-optimal power allocation matrix. Simulation results show that the proposed MGBA-SPA scheme outperforms other contrast schemes from the perspective of communication satisfaction, and it realizes the balance between the traffic request and the provided capacity of each ground beam cell.
Highlights
As an indispensable part of the future 6G vision [1,2], the ultra-dense low Earth orbit (LEO) satellite communication (UD-LSC) networks such as SpaceX and OneWeb can provide low latency, seamless coverage, and broadband communication [3]
With the matched beam association results, a multi-satellite power allocation optimization problem is formulated with non-convex interference constraints, and a successive convex approximation (SCA)-based power allocation (SPA) algorithm is proposed to maximize the satisfaction of beams
The performance of the UD-LSC system to cooperatively serve multiple LEO beam cells (LBCs) while sharing spectrum with the geostationary Earth orbit (GEO) satellite communication system is simulated by MATLAB
Summary
As an indispensable part of the future 6G vision [1,2], the ultra-dense low Earth orbit (LEO) satellite communication (UD-LSC) networks such as SpaceX and OneWeb can provide low latency, seamless coverage, and broadband communication [3]. In [9], the in-line interference was mitigated by adjusting the direction of phased array antennas of LEO satellites In this paper, both the angular domain and power domain are taken into consideration to achieve spectrum sharing between the GEO and the UD-LSC networks. We first propose a multi-satellite cooperative framework for UD-LSC networks to share the same spectrum with the GEO satellite, taking both the inter-system interference and intra-system interference into consideration. A multiple LEO satellite to multiple ground beam cell association problem is formulated, and a many-to-many match game-based beam association (MGBA) algorithm is proposed for the spectrum sharing between the GEO and UD-LSC networks. The inter-system interference (IGI) between the UD-LSC and GEO systems should be seriously considered
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