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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

Mathilde Benveniste

benveniste@ieee.org

Dongyan Chen

Avaya Labs - Research

M. Benveniste & D. Chen, Avaya Labs Research

our objective
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

simulation results for pf differentiation related reference 02 525r0
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

simulation scenarios
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

load1 uplink end to end delay sec
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

load1 downlink end to end delay sec
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

load2 end to end delay sec
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

load3 end to end delay sec
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

conclusions
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