Abstract
The low earth orbit (LEO) satellite network can benefit from software-defined networking (SDN) by lightening forwarding devices and improving service diversity. In order to apply SDN into the network, however, reliable SDN control links should be associated from satellite gateways to satellites, with the wireless and mobile properties of the network taken into account. Since these characteristics affect both control link association and gateway power allocation, we define a new cross layer SDN control link problem. To the best of our knowledge, this is the first attempt to explore the cross layer control link problem for the software-defined satellite network. A logically centralized SDN control framework constrained by maximum total power is introduced to enhance gateway power efficiency for control link setup. Based on the power control analysis of the problem, a power-efficient control link algorithm is developed, which establishes low latency control links with reduced power consumption. Along with the sensitivity analysis of the proposed control link algorithm, numerical results demonstrate low latency and high reliability of control links established by the algorithm, ultimately suggesting the feasibility, both technical and economical, of the software-defined LEO satellite network.
Highlights
Satellite networks have an advantage of global coverage and play a role as wireless backhaul for terrestrial communication networks even when the ground infrastructure is destroyed due to disasters
The gateway power allocation and the control link association are closely related with the channel environment, which should be optimized in a coupled manner
We demonstrate the feasibility of the software-defined satellite network by proposing a wireless software-defined networking (SDN) control link algorithm
Summary
Satellite networks have an advantage of global coverage and play a role as wireless backhaul for terrestrial communication networks even when the ground infrastructure is destroyed due to disasters. The gateway power allocation and the control link association are closely related with the channel environment, which should be optimized in a coupled manner We define this coupled problem as an SDN control link problem and tackle it with a cross layer approach, for realization of the software-defined LEO satellite network. On the other hand, dynamic control satellite placement in the LEO satellite network was addressed in [28], and the joint placement of controllers and satellite gateways in the software-defined satellite-terrestrial network was solved in [3] These papers, did not take wireless channels and power allocation into account. Given gateway set W and satellite s, data flow between intermediate vertices should be conserved under the constraint given as xi(js) −
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