Doc.: IEEE 802.11-02/214r1 Submission March 2002 Wentink, IntersilSlide 1 A simpler and better EDCF...
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Transcript of Doc.: IEEE 802.11-02/214r1 Submission March 2002 Wentink, IntersilSlide 1 A simpler and better EDCF...
March 2002
Wentink, Intersil
Slide 1
doc.: IEEE 802.11-02/214r1
Submission
A simpler and better EDCFA simpler and better EDCF
Menzo WentinkMenzo Wentink
Ron BrockmannRon Brockmann
Maarten HoebenMaarten Hoeben
IntersilIntersil
March 2002
Wentink, Intersil
Slide 2
doc.: IEEE 802.11-02/214r1
Submission
Related letter ballot commentsRelated letter ballot comments
March 2002
Wentink, Intersil
Slide 3
doc.: IEEE 802.11-02/214r1
Submission
Categories of LB commentsCategories of LB comments
• EDCF justificationEDCF justification– Complexity
– Performance – can it do the job
• EDCF requests for enhancementsEDCF requests for enhancements• No solution for IBSS operationNo solution for IBSS operation• No proven solution for overlapNo proven solution for overlap
March 2002
Wentink, Intersil
Slide 4
doc.: IEEE 802.11-02/214r1
Submission
Line of thinkingLine of thinking
March 2002
Wentink, Intersil
Slide 5
doc.: IEEE 802.11-02/214r1
Submission
Line of thinking (1)Line of thinking (1)
• In the current EDCF, IFS and CW are used for In the current EDCF, IFS and CW are used for latency and bandwidth differentiationlatency and bandwidth differentiation
• However: the CW space is limited as a However: the CW space is limited as a differentiator for both latency and bandwidth, differentiator for both latency and bandwidth, and AIFS is complexand AIFS is complex
• Instead, the CFB length per priority is a more Instead, the CFB length per priority is a more effective bandwidth differentiatoreffective bandwidth differentiator
• Separate latency and bandwidth differentiationSeparate latency and bandwidth differentiation– CW for latency (CWmin/CWmax) – CFB size for bandwidth
• Fixed parameter values!Fixed parameter values!
March 2002
Wentink, Intersil
Slide 6
doc.: IEEE 802.11-02/214r1
Submission
Line of thinking (2)Line of thinking (2)
• So for EDCF, we propose to differentiate three So for EDCF, we propose to differentiate three parameters:parameters:– CWmin, CWmax, CFB length
March 2002
Wentink, Intersil
Slide 7
doc.: IEEE 802.11-02/214r1
Submission
Applications - bandwidth vs latencyApplications - bandwidth vs latency
Ban
dwid
th
Latency
CF
B le
ngth
CWmin/CWmax
excellent effort
vide
o
best effort
HDTV
interactive
voice
10 ms 100 ms
0.5 ms
3 ms
0/1 15/10237/15
64 kbps
25 Mbps
March 2002
Wentink, Intersil
Slide 8
doc.: IEEE 802.11-02/214r1
Submission
• RTSThreshold = 300 Bytes.RTSThreshold = 300 Bytes.
Suggested EDCF default settingsSuggested EDCF default settings
prioritypriority CWminCWmin CWmaxCWmax CFB limitCFB limit
0 (be)0 (be) 1515 10231023 1 frame exch.1 frame exch.
1 (ee)1 (ee) 1515 10231023 1.5ms1.5ms
2 (it)2 (it) 77 1515 1 frame exch.1 frame exch.
3 – spare3 – spare -- -- --
4 (vi)4 (vi) 77 1515 3.0ms3.0ms
5 (vo)5 (vo) 00 11 0.5ms0.5ms
6 – spare6 – spare -- -- --
7 – spare7 – spare -- -- --
March 2002
Wentink, Intersil
Slide 9
doc.: IEEE 802.11-02/214r1
Submission
SimulationsSimulations
March 2002
Wentink, Intersil
Slide 10
doc.: IEEE 802.11-02/214r1
Submission
Simulations (1)Simulations (1)
• 24 Mbps PHY rate, unless noted otherwise24 Mbps PHY rate, unless noted otherwise• 802.11g slots (20 usec) are used, unless noted 802.11g slots (20 usec) are used, unless noted
otherwiseotherwise• RTSThreshold = 300 BytesRTSThreshold = 300 Bytes• Simulations are performed with Network Simulations are performed with Network
SimulatorSimulator
March 2002
Wentink, Intersil
Slide 11
doc.: IEEE 802.11-02/214r1
Submission
Simulations (2)Simulations (2)
• Traffic types in each scenarioTraffic types in each scenario– Voice: UDP, 290 Byte packets, 30 pps (G.711)
– Video: UDP, 2300 Byte packets, increasing load (+1 Mbps per second)
– Data: TCP, 1500 Byte packets
• All flows are upstreamAll flows are upstream• Note that the video latency and voice latency Note that the video latency and voice latency
plots have a different scaleplots have a different scale
March 2002
Wentink, Intersil
Slide 12
doc.: IEEE 802.11-02/214r1
Submission
16 nodes16 nodes7 voice streams7 voice streams1 video stream1 video stream7 data streams7 data streams
(16:7/1/7)(16:7/1/7)
March 2002
Wentink, Intersil
Slide 13
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 nodes voice: CWmin=0, CWmax=1, CFB=0.5ms (24 Mbps)video: CWmin=7, CWmax=15, CFB=3.0ms (36 Mbps)
data: CWmin=15, CWmax=1023 (24 Mbps)
applied videoload (Mbps)
throughput per class
data throughput
video throughput- increases linearly with the offered load
total throughout
voice bandwidth – unaffected by other load
video throughput capped whenthe applied video load exceeds amaximum level
25 Mbps
March 2002
Wentink, Intersil
Slide 14
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 nodes voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
applied video load (Mbps)
time fractions
data fraction
video fraction
total useful time fraction
voice fraction
100%
March 2002
Wentink, Intersil
Slide 15
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 nodes voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
applied video load (Mbps)
video throughputvideo throughput is capped whenthe applied video load exceeds amaximum levelthe video throughput rises linearly
with the offered video load
25 Mbps
March 2002
Wentink, Intersil
Slide 16
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 nodes voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
applied videoload (Mbps)
video latency
the video latency stays low over a very wide range
sharp increase when theoffered load exceedsthe maximum possible
50ms
March 2002
Wentink, Intersil
Slide 17
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 nodes voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
applied videoload (Mbps)
voice latency
the voice latency stays very low,even under heavy overload conditions10ms
March 2002
Wentink, Intersil
Slide 18
doc.: IEEE 802.11-02/214r1
Submission
Explanation of the EDCF parametersExplanation of the EDCF parameters
March 2002
Wentink, Intersil
Slide 19
doc.: IEEE 802.11-02/214r1
Submission
Why does CFB differentiation workWhy does CFB differentiation work
• EDCF assigns TXOPs independent of the TXOP EDCF assigns TXOPs independent of the TXOP lengthlength
• Longer CFBs results in higher usage per TXOP, Longer CFBs results in higher usage per TXOP, for same CW, thus higher bandwidthfor same CW, thus higher bandwidth
• CFBs reduce network contention and increase CFBs reduce network contention and increase the efficiency!the efficiency!
• Effect of CFBs increases when Effect of CFBs increases when overall traffic load increases, overall traffic load increases, because the CFBs are more fully because the CFBs are more fully usedused
March 2002
Wentink, Intersil
Slide 20
doc.: IEEE 802.11-02/214r1
Submission
CFBs CFBs decreasedecrease latency and jitter latency and jitter
• CFBs help to reduce network CFBs help to reduce network contention and collisionscontention and collisions– jitter is reduced
• CFBs allow to use relatively high CFBs allow to use relatively high CWmin values for high-bandwidth CWmin values for high-bandwidth priority streamspriority streams
• Lower CWmin values can be used Lower CWmin values can be used for low-latency applications like for low-latency applications like voicevoice
March 2002
Wentink, Intersil
Slide 21
doc.: IEEE 802.11-02/214r1
Submission
Another advantage of CFBsAnother advantage of CFBs
• Higher PHY rates result in increasingly Higher PHY rates result in increasingly inefficient EDCF operationinefficient EDCF operation– IFS and slot-time overhead becomes larger
compared to the length of frames
• Time-limited CFBs easily scale up to higher Time-limited CFBs easily scale up to higher bitrates by aggregating more frames into a bitrates by aggregating more frames into a single CFBsingle CFB
March 2002
Wentink, Intersil
Slide 22
doc.: IEEE 802.11-02/214r1
Submission
CWmin = 0?CWmin = 0?
• Ideal for transmitters with low traffic intensityIdeal for transmitters with low traffic intensity• Exponential backoff ensures CW increaseExponential backoff ensures CW increase• Very often, the medium is free at DIFSVery often, the medium is free at DIFS
– nodes with interrupted backoff never transmit at DIFS, because minimum remaining backoff after deferral is 1 slot --> DIFS+1 is the soonest!!.
• Fixed CWmin=0 automatically adapts to the Fixed CWmin=0 automatically adapts to the traffic load (more interrupted backoff)traffic load (more interrupted backoff)
March 2002
Wentink, Intersil
Slide 23
doc.: IEEE 802.11-02/214r1
Submission
CWmaxCWmax
• Worst-case latency and jitter are determined Worst-case latency and jitter are determined by CWmaxby CWmax– after few collisions the current CW can become very
large, even when started with a low CWmin
– latency insensitive traffic should defer to latency sensitive traffic in case of collisions.
– CWmax differentiation helps bounding jitter for low-latency streams
• The effect automatically adapts to traffic load, The effect automatically adapts to traffic load, based on based on fixedfixed CWmax settings CWmax settings
March 2002
Wentink, Intersil
Slide 24
doc.: IEEE 802.11-02/214r1
Submission
RTS/CTSRTS/CTS
• Protects no-Ack burstsProtects no-Ack bursts• Resolves hidden nodes situationsResolves hidden nodes situations• Reduces the cost of collisionsReduces the cost of collisions• The effect scales with the traffic load, based on The effect scales with the traffic load, based on
a fixed RTS thresholda fixed RTS threshold
March 2002
Wentink, Intersil
Slide 25
doc.: IEEE 802.11-02/214r1
Submission
Implementation is extremely simpleImplementation is extremely simple
• CWmin: existingCWmin: existing• CWmax: existingCWmax: existing• CFBs: similar to fragment burstingCFBs: similar to fragment bursting• RTS/CTS: existingRTS/CTS: existing• No IFS differentiationNo IFS differentiation• No new frame formatsNo new frame formats• No dynamic parameter updatesNo dynamic parameter updates
• Simple, but the functionality is great!Simple, but the functionality is great!
March 2002
Wentink, Intersil
Slide 26
doc.: IEEE 802.11-02/214r1
Submission
ConclusionsConclusions
March 2002
Wentink, Intersil
Slide 27
doc.: IEEE 802.11-02/214r1
Submission
Conclusions (1)Conclusions (1)
• Excellent support for voice under any scenario (< 10 Excellent support for voice under any scenario (< 10 ms delay)ms delay)
• Excellent support for video (<< 50 ms delay)Excellent support for video (<< 50 ms delay)
• Excellent bandwidth and latency differentiationExcellent bandwidth and latency differentiation
• Very high channel efficiencyVery high channel efficiency
• Scales transparantly to higher rate PHYsScales transparantly to higher rate PHYs
• Works in overlap and non-overlap scenariosWorks in overlap and non-overlap scenarios
• Works for IBSS and infrastructureWorks for IBSS and infrastructure
• Supports unicast, multicast and no-ACK (FEC)Supports unicast, multicast and no-ACK (FEC)
• Works upstream, downstream and sidestreamWorks upstream, downstream and sidestream
March 2002
Wentink, Intersil
Slide 28
doc.: IEEE 802.11-02/214r1
Submission
Conclusions (2)Conclusions (2)
• Requires no changes to current 802.11 MAC framesRequires no changes to current 802.11 MAC frames• Simple - Minimal set of mechanismsSimple - Minimal set of mechanisms• Constant parameters - no parameter-tuning intelligence Constant parameters - no parameter-tuning intelligence
needed in APneeded in AP– No possible oscillations between different implementations in
overlap situations
• Implicit accommodation of bursty trafficImplicit accommodation of bursty traffic• Legacy STAs can participate in QoS network, and receive Legacy STAs can participate in QoS network, and receive
QoS flowsQoS flows– No need for legacy upgrade
• Simple to Analyze/Simulate/ImplementSimple to Analyze/Simulate/Implement• Predictable behaviorPredictable behavior• Works with hidden nodesWorks with hidden nodes
March 2002
Wentink, Intersil
Slide 29
doc.: IEEE 802.11-02/214r1
Submission
• Explanation of the classesExplanation of the classes– be: Best Effort
– ee: Excellent Effort
– it: Interactive TCP
– vi: Video
– vo: Voice
Default settings (2)Default settings (2)
March 2002
Wentink, Intersil
Slide 30
doc.: IEEE 802.11-02/214r1
Submission
MotionsMotions
March 2002
Wentink, Intersil
Slide 31
doc.: IEEE 802.11-02/214r1
Submission
Contention Free BurstingContention Free Bursting
• This motion will be entertained on behalf of the This motion will be entertained on behalf of the HCF Ad Hoc groupHCF Ad Hoc group
March 2002
Wentink, Intersil
Slide 32
doc.: IEEE 802.11-02/214r1
Submission
Motion 1Motion 1• Instruct the Editor to incorporate changes to the Instruct the Editor to incorporate changes to the
TGe draft, such that EDCF differentiation is TGe draft, such that EDCF differentiation is limited to CWmin, CWmax and the TXOP limit limited to CWmin, CWmax and the TXOP limit per priority.per priority.
March 2002
Wentink, Intersil
Slide 33
doc.: IEEE 802.11-02/214r1
Submission
• Instruct the Editor to specify the mandatory Instruct the Editor to specify the mandatory default values for the following MIB variables:default values for the following MIB variables:
– RTSThreshold = 300 Bytes.
Motion 2Motion 2
ii dot11CWmin[i]dot11CWmin[i] dot11CWmax[i]dot11CWmax[i] dot11CPCFBlimit[i]dot11CPCFBlimit[i]
0 (be)0 (be) aCWminaCWmin aCWmaxaCWmax 00
1 (ee)1 (ee) aCWminaCWmin aCWmaxaCWmax 1.5ms1.5ms
2 (it)2 (it) 77 1515 00
33 -- -- --
4 (vi)4 (vi) 77 1515 3.0ms3.0ms
5 (vo)5 (vo) 00 11 0.5ms0.5ms
66 -- -- --
77 -- -- --
March 2002
Wentink, Intersil
Slide 34
doc.: IEEE 802.11-02/214r1
Submission
Motion 3Motion 3• Instruct the Editor to remove the QoS Parameter Instruct the Editor to remove the QoS Parameter
Set elementSet element
March 2002
Wentink, Intersil
Slide 35
doc.: IEEE 802.11-02/214r1
Submission
More simulationsMore simulations
March 2002
Wentink, Intersil
Slide 36
doc.: IEEE 802.11-02/214r1
Submission
SimulationsSimulations
• All flows are upstream (sidestream)All flows are upstream (sidestream)
• Traffic typesTraffic types– voice: UDP, 290 Byte packets, 30 pps (G.711)
– video: UDP, 2300 Byte packets, increasing load (+1 Mbps per second)
– data: TCP, 1500 Byte packets
• Note that the video and voice latency plots have a Note that the video and voice latency plots have a different scaledifferent scale
• NotationNotation– 4:1/1/1 for 4 active nodes, 1 voice, 1 video, 1 background
– 7-15-3.0 for CWmin=7, CWmax=15, CFB size=3.0ms
March 2002
Wentink, Intersil
Slide 37
doc.: IEEE 802.11-02/214r1
Submission
4:1/1/14:1/1/1
7-15-3.07-15-3.0
March 2002
Wentink, Intersil
Slide 38
doc.: IEEE 802.11-02/214r1
Submission
1 voice (24) / 1 video (36) / 1 data (24) / 4 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 39
doc.: IEEE 802.11-02/214r1
Submission
1 voice / 1 video (36) / 1 data / 4 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
time fractions100%
March 2002
Wentink, Intersil
Slide 40
doc.: IEEE 802.11-02/214r1
Submission
1 voice / 1 video (36) / 1 data / 4 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 41
doc.: IEEE 802.11-02/214r1
Submission
1 voice / 1 video (36) / 1 data / 4 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 42
doc.: IEEE 802.11-02/214r1
Submission
1 voice / 1 video (36) / 1 data / 4 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 43
doc.: IEEE 802.11-02/214r1
Submission
18:7/3/718:7/3/7
7-15-3.07-15-3.0
March 2002
Wentink, Intersil
Slide 44
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 19 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 45
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 19 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
time fractions per class100%
March 2002
Wentink, Intersil
Slide 46
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 19 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video throughput12 Mbps
March 2002
Wentink, Intersil
Slide 47
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 19 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 48
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 19 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 49
doc.: IEEE 802.11-02/214r1
Submission
16:7/1/716:7/1/7
15-15-4.515-15-4.5
March 2002
Wentink, Intersil
Slide 50
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 51
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
time fraction per class100%
March 2002
Wentink, Intersil
Slide 52
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video throughput20 Mbps
March 2002
Wentink, Intersil
Slide 53
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 54
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 1 video (36) / 7 data / 16 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 55
doc.: IEEE 802.11-02/214r1
Submission
18:7/3/718:7/3/7
15-15-4.515-15-4.5
March 2002
Wentink, Intersil
Slide 56
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 18 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 57
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 18 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
time fraction per class100%
March 2002
Wentink, Intersil
Slide 58
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 18 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video throughput
March 2002
Wentink, Intersil
Slide 59
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 18 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 60
doc.: IEEE 802.11-02/214r1
Submission
7 voice / 3 video (36) / 7 data / 18 voice: CWmin=0, CWmax=1, CFB=0.5ms
video: CWmin=15, CWmax=15, CFB=4.5msdata: CWmin=15, CWmax=1023, CFB=0
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 61
doc.: IEEE 802.11-02/214r1
Submission
8:3/1/38:3/1/3
7-15-3.57-15-3.5
CCK RTS/CTSCCK RTS/CTS
March 2002
Wentink, Intersil
Slide 62
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 1 video (36) / 3 data / 8 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.5ms
data: CWmin=15, CWmax=1023
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 63
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 1 video (36) / 3 data / 8 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.5ms
data: CWmin=15, CWmax=1023
video load(Mbps)
time fraction per class
March 2002
Wentink, Intersil
Slide 64
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 1 video (36) / 3 data / 8 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.5ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 65
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 1 video (36) / 3 data / 8 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.5ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 66
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 1 video (36) / 3 data / 8 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.5ms
data: CWmin=15, CWmax=1023
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 67
doc.: IEEE 802.11-02/214r1
Submission
10:3/3/310:3/3/3
7-15-3.07-15-3.0
802.11a PHY802.11a PHY
March 2002
Wentink, Intersil
Slide 68
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 69
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
time fraction per class
March 2002
Wentink, Intersil
Slide 70
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 71
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 72
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 73
doc.: IEEE 802.11-02/214r1
Submission
10:5/1/510:5/1/5
7-15-3.07-15-3.0
0% PHY frame loss0% PHY frame loss
(+ collisions)(+ collisions)
March 2002
Wentink, Intersil
Slide 74
doc.: IEEE 802.11-02/214r1
Submission
5 voice / 1 video (36) / 5 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 75
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
time fraction per class
March 2002
Wentink, Intersil
Slide 76
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 77
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 78
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 79
doc.: IEEE 802.11-02/214r1
Submission
10:5/1/510:5/1/5
7-15-3.07-15-3.0
2% PHY frame loss2% PHY frame loss
(+ collisions)(+ collisions)
March 2002
Wentink, Intersil
Slide 80
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 81
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
time fraction per class
March 2002
Wentink, Intersil
Slide 82
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 83
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 84
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 85
doc.: IEEE 802.11-02/214r1
Submission
10:5/1/510:5/1/5
7-15-3.07-15-3.0
hidden video nodehidden video node
March 2002
Wentink, Intersil
Slide 86
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 87
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
time fraction per class
March 2002
Wentink, Intersil
Slide 88
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 89
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 90
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
voice latency
March 2002
Wentink, Intersil
Slide 91
doc.: IEEE 802.11-02/214r1
Submission
8:3/1/38:3/1/3
7-15-3.07-15-3.0
Best effort at 12MbpsBest effort at 12Mbps
March 2002
Wentink, Intersil
Slide 92
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data (12) / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
throughput per class25 Mbps
March 2002
Wentink, Intersil
Slide 93
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data (12) / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
time fraction per class
March 2002
Wentink, Intersil
Slide 94
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data (12) / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video throughput25 Mbps
March 2002
Wentink, Intersil
Slide 95
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data (12) / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
video latency
March 2002
Wentink, Intersil
Slide 96
doc.: IEEE 802.11-02/214r1
Submission
3 voice / 3 video (36) / 3 data (12) / 10 voice: CWmin=0, CWmax=1, CFB=0.5msvideo: CWmin=7, CWmax=15, CFB=3.0ms
data: CWmin=15, CWmax=1023
video load(Mbps)
voice latency