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PF Differentiation and EDCF/RR

PF Differentiation and EDCF/RR. Mathilde Benveniste benveniste@ieee.org Dongyan Chen Avaya Labs - Research. Our Objective. Re-introduce persistence factors to help improve EDCF performance [01/409r2] RRs [QoS-Null frames] can have their own EDCF priority class with parameters:

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PF Differentiation and EDCF/RR

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  1. PF Differentiation and EDCF/RR Mathilde Benveniste benveniste@ieee.org Dongyan Chen Avaya Labs - Research M. Benveniste & D. Chen, Avaya Labs Research

  2. Our Objective Re-introduce persistence factors to help improve EDCF performance [01/409r2] RRs [QoS-Null frames] can have their own EDCF priority class with parameters: • AIFS = PIFS (with backoff >= 1) shared with other TCs • CWmin shorter than that of other TCs with same AIFS • PF smallest of all TCs M. Benveniste & D. Chen, Avaya Labs Research

  3. Simulation Results for PF DifferentiationRelated Reference: 02/525r0 Three loads considered on 11Mbps DS channel: Load1 is transmitted by polling with EDCF/RR - 8 stations engaged in two-way exchange with AP of time-sensitive bursty traffic Payload=120 bytes; inter-arrival fixed at 10 ms when ON; exponential 342 ms ON /650 ms OFF (example: silence suppressed voice) Load2 contends for the channel through EDCF – 6 stations sending high priority data uplink Payload=724 bytes; inter-arrival exponential at 8.2 ms Load3 contends for the channel through DCF – 5 stations sending low priority data uplink Payload=724 bytes; inter-arrival exponential at 8.2 ms M. Benveniste & D. Chen, Avaya Labs Research

  4. Simulation Scenarios The performance of EDCF/RR is compared under two scenarios that differ with respect to their PFs • No PF differentiation (NPF) TC1 [for RRs] – AIFS=PIFS; CWmin=8; CWmax=8; (PF=1) TC2 [for Load 2] – AIFS=PIFS; Cwmin=16; CWmax=16; (PF=1) TC3 [for Load 3] – AIFS=DIFS; Cwmin=32; CWmax=1024; (PF=2) • With PF differentiation (WPF) TC1 [for RRs] – AIFS=PIFS; CWmin=8; CWmax=2; PF=0.5 TC2 [for Load 2] – AIFS=PIFS; Cwmin=16; CWmax=1024; PF=1.5 TC3 [for Load 3] – AIFS=DIFS; Cwmin=32; CWmax=1024; PF=2 Uplink and downlink transmission through HCF in CP the two reservation mechanisms • CC/RR: CCI period=5 ms; CCOPS=50 • EDCF/RR: PF=0.5 [01/409r2]; AIFS=PIFS; Cwmin=8 is compared under two scenarios • Under low load (LL) The load consists of time-critical bursty traffic (Load1, p 8) • With heavy DCF load (HL) A best effort load of 5 Mpbs is added (Load2, p 8) M. Benveniste & D. Chen, Avaya Labs Research

  5. Load1 uplink end-to-end delay (sec) Without optimization NPF without PF differentiation WPF with PF differentiation • PF differentiation helps RR & uplink transmission • EDCF/RR becomes more effective M. Benveniste & D. Chen, Avaya Labs Research

  6. Load1 downlink end-to-end delay (sec) NPF without PF differentiation WPF with PF differentiation • PF differentiation reduces contention • It helps HCF channel access for downlink transmission M. Benveniste & D. Chen, Avaya Labs Research

  7. Load2 end-to-end delay (sec) NPF without PF differentiation WPF with PF differentiation • PF differentiation reduces collisions between TC1 and TC2 • It reduces delays for both TCs M. Benveniste & D. Chen, Avaya Labs Research

  8. Load3 end-to-end delay (sec) WPFwithPF differentiation NPF without PF differentiation • Without PF differentiation, low-priority traffic • gets through sooner, while TC1 and TC2 transmissions collide M. Benveniste & D. Chen, Avaya Labs Research

  9. Conclusions • PF differentiation helps EDCF/RR get the RRs out sooner and thus improves HCF performance • PF differentiation reduces contention among EDCF TCs and improves EDCF performance • PFs are simple to implement [01/409r2] M. Benveniste & D. Chen, Avaya Labs Research

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