Abstract
High Throughput Satellite (HTS) systems aim to push data rates to the order of Terabit/s, making use of Extremely High Frequencies (EHF) or free-space optical (FSO) in the feeder links. However, one challenge that needs to be addressed is that the use of such high frequencies makes the feeder links vulnerable to atmospheric conditions, which can effectively disable channels at times or temporarily increases the bit error rates. One way to cope with the problem is to introduce site diversity and to forward the data through the gateways not affected, or at least less constrained, by adverse conditions. In this paper, a virtual network function (VNF) introduced through reinforcement learning defines a smart routing service for an HTS system. Experiments were conducted on an emulated ground-satellite system in CloudLab, testing a VNF implementation of the approach with software-defined networking virtual switches, which indicate the expected performance of the proposed method.
Highlights
The networking industry has been dominated by the use of proprietary hardware appliances built with application-specific integrated circuits (ASIC)
The entire Ka frequency band was allocated to the user link to prevent the bandwidth limitation, moving the feeder link to Extremely High Frequencies (EHF) with spatial diversity of the gateways to combat the channel impairments that may randomly appear due to atmospheric conditions [4]
We explored the use of hierarchical SLAs besides the above two methods as a means to improve the efficacy of the routing decisions
Summary
The networking industry has been dominated by the use of proprietary hardware appliances built with application-specific integrated circuits (ASIC). Various approaches to gateway redundancy were proposed to prevent the need for doubling the infrastructure required for the ground segments These approaches assumed that all gateways are interconnected by high-speed terrestrial links, and the traffic of a given user can be redirected to another gateway. An SDN controller that load balances traffic between two snort (intrusion prevention systems) VNF instances based on a control-theoretic approach was proposed [9]. An elastic routing service implemented as a Ryu controller is deployed as a VNF to load balance the network traffic across dynamically provisioned switches in a framework called UNIFY ESCAPE [11]
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