Less-than-Best-Effort Service for Community Wireless Networks: Challenges at Three Layers 1 GAIA meeting, 89 th IETF Meeting 6. 3. 2014 Michael Welzl

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Presentation transcript:

Less-than-Best-Effort Service for Community Wireless Networks: Challenges at Three Layers 1 GAIA meeting, 89 th IETF Meeting Michael Welzl

Context: the LCDNet vision From 2

Layer 2 LBE Outside not under control 3 Inside under control Can control: – Both ways: PHY rates, PCF? e QoS? – Download: RA algorithm, DCF parameters like CW download upload

RA alg. impact 4 From: Naeem Khademi, Michael Welzl, Stein Gjessing: "Experimental Evaluation of TCP Performance in Multi-rate WLANs”, IEEE WoWMoM 2012.

Layer 3 LBE Shortest path routing is THE routing method – This overloads the shortest path – If there are multiple paths, LBE traffic could take a detour Tools exist: e.g. MPLS TE, ECMP… but typically still shortest paths used multi topology (MT) routing, meant for IP fast reroute, could be a good fit Small packets could be costly (power consumption) – May want to aggregate + tunnel them (TCMTF) 5

Layer 4 LBE End systems: LEDBAT isn’t great – Much more stuff exists – LBE != LBE… Routers / AP / Modem: AQM can differentiate (early mark/drop) Queue scheduling can differentiate (CBQ etc) 6 From: David Ros, Michael Welzl: "Assessing LEDBAT's Delay Impact", IEEE Communications Letters 17(5), pp , 2013.

Conclusion LEDBAT isn’t enough, it’s a larger story – Research needed 7

Thank you! Questions?