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Doc.: IEEE 802.11-11/0668r7 SubmissionMatt Fischer, Broadcom TX Mask Shoulders vis-à-vis ACI Date: 2011-05-04 Authors: May 2011 Slide 1.

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Presentation on theme: "Doc.: IEEE 802.11-11/0668r7 SubmissionMatt Fischer, Broadcom TX Mask Shoulders vis-à-vis ACI Date: 2011-05-04 Authors: May 2011 Slide 1."— Presentation transcript:

1 doc.: IEEE 802.11-11/0668r7 SubmissionMatt Fischer, Broadcom TX Mask Shoulders vis-à-vis ACI Date: 2011-05-04 Authors: May 2011 Slide 1

2 doc.: IEEE 802.11-11/0668r7 Submission Abstract A comment requesting a change to the way spectral mask levels are calculated was submitted [1] The comment states that due to the increase in 11ac in the allowable in- band ripple from +/-2dB to +/-4dB there is a risk that the adjacent channel leakage (which is measured relative to peak power) will also increase by 2dB if device manufacturers take advantage of the increased allowable in-band ripple and hence will increase interference and reduce network Tput We therefore study here the effect on system Tput of increased adjacent channel leakage by 2dB to quantify the potential degradation We use PHY system simulations to compare the effect of different CCA levels on system Tput as in [2] We also show results of some MAC-level system simulations Matt Fischer, Broadcom May 2011 Slide 2

3 doc.: IEEE 802.11-11/0668r7 Submission Spectral Mask Matt Fischer, Broadcom May 2011 Slide 3

4 doc.: IEEE 802.11-11/0668r7 Submission PHY System Simulation Parameters 36 APs and 4 STA per AP are dropped in an area of size 300x300 ft and 600x600ft APs are placed regularly with 5ft std STAs are associated with closest AP according to path loss (which includes random shadowing) One valid transmission per BSS is assumed BSSs are chosen randomly that meet CCA rules (50% probability to choose an AP as transmitter) After all transmitters were chosen SINR is calculated at each receiver and mapped to MCS SISO links over one 40MHz channel are assumed with 15dBm transmit power CCA level is fixed at -79dBm 4 different frequencies are assigned to the 36 AP in two different ways: –Ordered frequency allocation 2 4 2 4 2 4 1 3 1 3 1 3 4 2 4 2 4 2 3 1 3 1 3 1 2 4 2 4 2 4 1 3 1 3 1 3 –Random frequency allocation – in each drop each BSS randomly chooses one of four frequencies Simulation uses 50 drops and 250 TXOP per drop. In each TXOP a maximum number of transmitters across all frequencies are chosen without violating the CCA levels The Baseline ACL was assumed either -25dBr or -40dBr for all other three frequencies to separately reflect the average interference values with adjacent and alternate adjacent ACL. Tput loss is then measured with -23dBr and -38dBr Matt Fischer, Broadcom May 2011 Slide 4

5 doc.: IEEE 802.11-11/0668r7 Submission Results Matt Fischer, Broadcom May 2011 Slide 5

6 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Parameters Case 5 Case 5: –Office environment Approx 30 x 50 m One floor simulated –2 BSS 1 BSS on each of two adjacent channels AP0 + 10 clients AP11 + 10 clients –TCP flows in both directions for every AP-client pair –ED-CCA level = -62 dBm –CRS level = -90 dBm –RTS ON (1 Mbps) vs RTS OFF Matt Fischer, Broadcom May 2011 Slide 6

7 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 5 Matt Fischer, Broadcom May 2011 Slide 7

8 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 5 Matt Fischer, Broadcom May 2011 Slide 8

9 doc.: IEEE 802.11-11/0668r7 Submission MAC_SIM Results Case 5 Matt Fischer, Broadcom May 2011 Slide 9

10 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Parameters Case 6 Case 6: –Same floor area as Case 1 –2 BSS 1 BSS on one channel, 1 BSS on a second channel (adjacent) –2 clients per BSS 6 STA total AP plus clients –TCP flows in both directions for every AP-client pair –ED-CCA level = varied from -53 dBm to -71 dBm –CRS level = -90 dBm Matt Fischer, Broadcom May 2011 Slide 10

11 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 6 Matt Fischer, Broadcom May 2011 Slide 11

12 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 6 Matt Fischer, Broadcom May 2011 Slide 12

13 doc.: IEEE 802.11-11/0668r7 Submission MAC_SIM Results Case 6 Matt Fischer, Broadcom May 2011 Slide 13

14 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Parameters Case 7 Case 7: –Same floor area as Case 1 –2 BSS 1 BSS on one channel, 1 BSS on a second channel (adjacent) –2 clients per BSS 6 STA total AP plus clients Note client placement –Flows: U = 4x TCP flows only UPLINK for each AP-client pair D = 4x TCP flows only DOWNLINK for each AP-client pair UD = 2x TCP flows: AP0 -> C2, C4 -> AP3 DU = 4x TCP flows: AP0 -> C2, C1 -> AP0, C4 -> AP3, AP3 -> C5 –ROFF = RTS OFF, RON = RTS ON May 2011 Matt Fischer, BroadcomSlide 14

15 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 7 Matt Fischer, Broadcom May 2011 Slide 15

16 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 7 Matt Fischer, Broadcom May 2011 Slide 16

17 doc.: IEEE 802.11-11/0668r7 Submission MAC_SIM Results Case 7 Matt Fischer, Broadcom May 2011 Slide 17

18 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Parameters Case 8 Case 8: –Slightly different from case 7 – APs are farther apart Attempt to get main link margin to be smaller –2 BSS 1 BSS on one channel, 1 BSS on a second channel (adjacent) –2 clients per BSS 2 AP and 4 clients (effectively only two clients) –2 TCP flows: U = C4 -> AP3, C2 -> AP0 D = C4 <- AP3, C2 <- AP0 UD =C4 -> AP3, AP0 -> C2 Matt Fischer, Broadcom May 2011 Slide 18

19 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 8 Matt Fischer, Broadcom May 2011 Slide 19

20 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 8 Matt Fischer, Broadcom May 2011 Slide 20

21 doc.: IEEE 802.11-11/0668r7 Submission MAC_SIM Results Case 8 Matt Fischer, Broadcom May 2011 Slide 21

22 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Parameters Case 9-C2R4 Case 9-C2R4: –3 Floor office building –9 BSS per floor (2500 sq ft per BSS maximum) Semi-rigid AP locations with random variance Random channel assignment from 2 adjacent channels –1-3 clients per BSS (randomly assigned, randomly located) Over 110% of BSS area –TCP flows: 3:1 ratio DOWN to UP, randomly assigned –One flow per client –CCA level = -62 dBm –R4, R5, R6 = distinct randomizations Matt Fischer, Broadcom May 2011 Slide 22

23 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 9-C2R4 common color = common channel Matt Fischer, Broadcom May 2011 Slide 23

24 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 9-C2R4 common color = common channel Matt Fischer, Broadcom May 2011 Slide 24

25 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 9-C2R4 Matt Fischer, Broadcom May 2011 Slide 25

26 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 9-C2R5 Matt Fischer, Broadcom May 2011 Slide 26

27 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 9-C2R5 Matt Fischer, Broadcom May 2011 Slide 27

28 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 9-C2R6 Matt Fischer, Broadcom May 2011 Slide 28

29 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 9-C2R6 Matt Fischer, Broadcom May 2011 Slide 29

30 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 9-C3R7 3 Channels to choose from Matt Fischer, Broadcom May 2011 Slide 30

31 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 9-C3R7 Matt Fischer, Broadcom May 2011 Slide 31

32 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 9-C4R8 Four channels to choose from Matt Fischer, Broadcom May 2011 Slide 32

33 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim RXPWR Case 9-C4R8 Matt Fischer, Broadcom May 2011 Slide 33

34 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Results Case 9 Matt Fischer, Broadcom May 2011 Slide 34

35 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Parameters Case 11 Case 11: –1 floor –2 BSS Semi-rigid AP locations with random variance 2 adjacent channels Varying TX Mask shoulders Randomized placements Randomized up and down pair flows –3:1 ratio DOWN to UP, randomly assigned –One flow per client Typical AP separation = 15 m Matt Fischer, Broadcom May 2011 Slide 35

36 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Results Case 11 20 randomized cases May 2011 Matt Fischer, BroadcomSlide 36

37 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Results Case 11 20 randomized cases averaged May 2011 Matt Fischer, BroadcomSlide 37

38 doc.: IEEE 802.11-11/0668r7 Submission Simulation Conclusions Minimal per-link Tput degradation. No sum network Tput degradation for increase from -40 to -38dBr Small (few % points) network Tput degradation for increase from -25 to -23dBr probably due to reduced average number of concurrent transmissions Notes: –In reality when many channels are available (as in the case of 40MHz channels) the interference level will be mostly -40dBr since most channels are not adjacent. –Interference level of -25dBr will only be the dominant case if only 2-3 channels are available –The simulation assumes full buffer – all nodes always have something to transmit – this is a worst case scenario from interference point of view. While it’s not clear that implementations of 802.11ac will actually have in-band signal power variations of +/-4dB, the effect on network Tput is modest. Therefore, we propose not to include restrictions (equations, etc.) to the spectral flatness. Matt Fischer, Broadcom May 2011 Slide 38

39 doc.: IEEE 802.11-11/0668r7 Submission References [1] 11-11-0276-11-00ac-tgac-d0-1-comments.xls –CID 488 [2] 11-11-0061-00-00ac-cca-threshold-levels.ppt May 2011 Matt Fischer, BroadcomSlide 39

40 doc.: IEEE 802.11-11/0668r7 Submission Appendix Randomly selected topographies May 2011 Matt Fischer, BroadcomSlide 40

41 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-0 Matt Fischer, Broadcom May 2011 Slide 41

42 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-2 Matt Fischer, Broadcom May 2011 Slide 42

43 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-4 May 2011 Matt Fischer, BroadcomSlide 43

44 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-5 May 2011 Matt Fischer, BroadcomSlide 44

45 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-7 Matt Fischer, Broadcom May 2011 Slide 45

46 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-8 Matt Fischer, Broadcom May 2011 Slide 46

47 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-12 Matt Fischer, Broadcom May 2011 Slide 47

48 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-16 Matt Fischer, Broadcom May 2011 Slide 48

49 doc.: IEEE 802.11-11/0668r7 Submission MAC Sim Topography Case 11-17 Matt Fischer, Broadcom May 2011 Slide 49

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