A Control Theory based Medium Access Control for the downstream satellite uplink of SATIP6 project
نویسندگان
چکیده
This paper describes a controller for allocating shared bandwidth and a scheduler for transmitting IP traffic from the Gateway to the Users’ Terminals of the satellite network studied in SATIP6 IST project. The paper describes the algorithms employed in the MAC controller in terms of various components of a classical control system and a fuzzy tuning component. The focus of this work is on the solution of the MAC problem relative to the downstream uplink channel of the SATIP6 satellite network, through the modeling approach proper to the Theory of Control. We conceive a situation where various connections flow from Internet into a Hub Station (Gateway) which broadcasts data towards the satellite, from where flows are redirected towards the various users’ Satellite Terminals. The goal of the controller is to calculate an equilibrium to share the Hub Station preassigned bandwidth resource between the various flows so as to respect the assigned Quality of Service (QoS) contract of each connection and lose as few non-compliant packets as possible. In such a way, on the downstream uplink, bandwidthand resource-consuming algorithms using bandwidth request signalling to the NCC (Network Control Centre) can be avoided.
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