Proposal for a separate QAP EDCF parameter set

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Presentation transcript:

Proposal for a separate QAP EDCF parameter set March 2003 Proposal for a separate QAP EDCF parameter set Richard van Leeuwen, Agere Systems

March 2003 The issue In a QBSS using EDCF, upstream traffic has an advantage over downstream traffic Several QSTAs contend for the medium to send upstream traffic A QAP is a single contender, but needs to service downstream traffic for all QSTA in its QBSS. This asymmetry is often the reverse of what is desired (Think of ADSL)

March 2003 The solution Allow the QAP to use different (higher priority) EDCF parameter values than the values it advertises to the QSTAs in its QBSS

March 2003 The current draft Clauses 7.3.2.14 and 9.1.3.1 do not explicitly allow/disallow the QAP to use different EDCF parameter values Annex D (MIB) include objects for 1 AC only dot11HCCWmin, dot11HCCWmax, dot11AIFS Related letter ballot #51 comments: 430 1001 1046

March 2003 Simulation Scenario

Flows 5 Voice nodes 0..15 Data nodes March 2003 Flows 5 Voice nodes Each with 1 up- and 1 downstream voice flow UDP, 298 byte packets, 30 msec (G.711) Voice nodes started after 1 sec (warm-up) 0..15 Data nodes Each with 1 up- and 1 downstream data flow UDP using 1500 byte packets every 50 msec 1 data node added every second Both Voice and Data use 11 Mbps transmit rate 802.11b timing 5% Packet Error Rate

EDCF Parameters (11b) Default parameter values for all QSTAs March 2003 EDCF Parameters (11b) Default parameter values for all QSTAs Suggested default values for QAP Traffic type CWmin CWmax AIFS Best Effort 31 1023 2 Voice 7 15 1 Traffic type CWmin CWmax AIFS Best Effort 15 511 Voice 7

March 2003

March 2003

March 2003 Proposal Add sentence in 9.1.3.1 to explicitly allow a QAP to use a different EDCF parameter set Include a QAP EDCF table to MIB in Annex D Suggested MIB object: dot11QAPEDCFTable With 4 entries (1 for each AC) Each entry contains attributes: CWmin, CWmax, AIFS, TXOPLimit