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Experimental Evaluation of Moderated EDCA over WMP: Implementation and Results

Explore the implementation of Moderated EDCA (M-EDCA) in wireless MAC Processor (WMP) architecture and its effects on backoff processes. Results show improved throughput and lower variability.

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Experimental Evaluation of Moderated EDCA over WMP: Implementation and Results

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  1. Date: November 11, 2015 Experimental evaluation of Moderated EDCA over WMP Authors:

  2. Experiment Setup • 6 contending nodes under saturated greedy traffic • two groups of stations: legacy EDCA and moderated EDCA (M-EDCA) Moderated EDCA EDCA AP

  3. How to implemented M-EDCA? • In principle a very ‘small’modification of the protocol, but working on lower-mac parameters.. • How to measure backoff freezing occurrences, being backoff process hard-coded into the card? • Feasible thanks to the Wireless MAC Processor (WMP) architecture! • Developed by the CNIT research team within the European research project FLAVIA

  4. MAC design: XFSM WMP Architecture • In one slide… • Set of radio tasks pre-implemented in the NIC • actions, events, conditions • In practice, a MAC-specific «instruction set» • MAC programs: eXtended Finite State Machines • Suitably byte-coded for injection in the NIC • NIC: no more a protocol, but an XFSM executor • Called «wireless MAC processor» bytecode MAC Engine: XFSM executor load MAC Bytecode

  5. From EDCA to M-EDCA(basically, adding a transition for counting IPT!) RX PHASE TX PHASE BACKOFF

  6. CW Updates • Periodic CW updates in Userspace (for using floating-point arithmetic): • Sample IPT at regular time intervals and update CW • CW update acts directly on NIC registers. • State machine at firmware level: • Measure IPTm • Filter IPT = IPT + 1/8 * (IPTm -IPT); T USERSPACE SCRIPT CW update DATA REQUEST WMP REGISTER FIRMWARE

  7. Results • Reference experiment: 6 EDCA legacy nodes • Throughput variability from 0.6 to 1.6 Mbps due to real position-dependent interference • Average CW from 21.58 to 29.24 6 EDCA EDCA CW

  8. Results • 3 EDCA legacy nodes vs. 3 Moderated EDCA • Throughput results comparable with previous ones! • lower variability for M-EDCA stations • Average CW for Moderated EDCA equal to 22 (vs. 24 obtained in simulation) • Damping factor selected 0.7 and 0.1 • Moderated CWs updated every 100ms • See plots on next slides

  9. Throughput (damping 0.7)

  10. Throughput (damping 0.1)

  11. EDCA CW (damping 0.7)

  12. EDCA CW (damping 0.1)

  13. Moderated EDCA CW (damping 0.7)

  14. Moderated EDCA CW (damping 0.1)

  15. References https://mentor.ieee.org/802.11/dcn/15/11-15-1152-01-000m-moderated-backoff.ppt

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