Per-flow AQM schemes are designed to provide fair resource management between flows and limit the negative effects of non-adaptive UDP-based flows. To overcome the flow bandwidth limitation, P2P and file sharing applications usually open multiple simultaneous TCP based flows. Although each TCP-based flow is adaptive and responds to network congestion, the aggregated demand of such application consumes network resources and dominates the queue space. In this article we suggest a new per user AQM policy designed to remedy this problem. Since user traffic in access networks is usually carried in user tunnels such as PPP or GTP, an access network device cannot identify the underlying applications and TCP/UDP flows. The new per-user AQM policy presented here operates in the dark and only uses tunnel aggregated statistics. Simulation results show that it significantly reduces the bias effects of heavy, demanding applications.
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