Journal of Applied Sciences ›› 2023, Vol. 41 ›› Issue (5): 738-752.doi: 10.3969/j.issn.0255-8297.2023.05.002

• Communication Engineering • Previous Articles    

Contact Plan Design Based on Data Check Time-Space Graph in Satellite Networks

DAI Cuiqin, HE Liming, LUO Yi   

  1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
  • Received:2021-12-03 Published:2023-09-28

Abstract: To address network time-space connectivity and traffic congestion issues in low earth orbit satellite networks, a contact plan design scheme based on data check timespace graph (DCTSG-CPD) is proposed via jointly considering the inter-satellite links state, satellite energy efficiency and load state. Firstly, a data check time-space graph (DCTSG) is constructed based on the battery model, and the contact plan design is modeled as a problem of maximizing throughput under constraints of inter-satellite links and satellite energy. Secondly, on the basis of the given DCTSG, the network congestion state is judged through comparing the checkout data and forwarded data. An available contact plan (CP) is generated according to the satellite load and the traffic congestion state of inter satellite link. Finally, the fitness function is designed to evaluate the available CP, and a data check genetic algorithm (DCGA) is developed to update the optimal CP with maximum throughput. Simulation results demonstrate that the proposed DCTSG-CPD scheme improves throughput, and reduces data delivery delay effectively.

Key words: satellite network, contact plan design, time-space graph, data check, throughput

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