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TG ax Indoor Enterprise Scenarios, Color, DSC and TPC

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Presentation on theme: "TG ax Indoor Enterprise Scenarios, Color, DSC and TPC"— Presentation transcript:

1 TG ax Indoor Enterprise Scenarios, Color, DSC and TPC
April 2013 doc.: IEEE May 2016 TG ax Indoor Enterprise Scenarios, Color, DSC and TPC Date: Authors: Graham Smith, SR Technologies Graham Smith, DSP Group

2 May 2016 Background DSC, Color and TPC have all been proposed for spatial reuse. The OBSS situation is fully examined based upon the two indoor enterprise scenarios The Indoor Enterprise scenario is examined for two rooms with the 4CH case and the 9 channel case The Indoor cell enterprise scenario is examined for two cells with the 3CH and 7 channel cases. Legacy, Legacy/TPC, Color, Color/TPC, DSC, DSC/TPC and DSC/ “TPC one” are all examined. Results show blocking and sharing and a ‘figure of merit’ is used for comparison Graham Smith, SR Technologies

3 Topography of Indoor Enterprise
May 2016 Topography of Indoor Enterprise We examine just this case Graham Smith, SR Technologies

4 May 2016 4 Channel re-use Graham Smith, SR Technologies

5 May 2016 Graham Smith, SR Technologies

6 May 2016 9 CH Scenario Graham Smith, SR Technologies

7 Indoor Cell enterprise scenario
May 2016 Indoor Cell enterprise scenario 24 STAs per cell Graham Smith, SR Technologies

8 May 2016 Graham Smith, SR Technologies

9 Methodology May 2016 UL case example “Blocked” and “Share” terminology
For each STA, the wanted UL RSSI at the AP is calculated, “Pr wanted” The RSSIs at the AP from all the other STAs and the AP in the other network are calculated, “Pr unwanted” The RSSIs at the transmitting STA, from all the other STAs and the AP in the other network are calculated, “Pr interference” If “Pr interference” < CCA Threshold, the STA will transmit If “Pr wanted – Pr unwanted” > 20dB, SUCCESS If “Pr wanted – Pr unwanted” < 20dB, BLOCKED If “Pr interference” > CCA Threshold, the STA will not transmit SHARE “Blocked” and “Share” terminology “Blocked” – Transmission allowed when SNIR < 20dB, then both signals fail. “Share” – Transmission prevented when SNIR < 20dB, standard contention. Graham Smith, SR Technologies

10 Methodology May 2016 DL case example “Blocked” and “Share” terminology
For each STA, the wanted DL RSSI from the AP is calculated, “Pr wanted” The RSSIs at the STA from all the other STAs and the AP in the other network are calculated, “Pr unwanted” The RSSIs at the transmitting AP, from all the other STAs and the AP in the other network are calculated, “Pr interference” If “Pr interference” < CCA Threshold, the STA will transmit If “Pr wanted – Pr unwanted” > 20dB, SUCCESS If “Pr wanted – Pr unwanted” < 20dB, BLOCKED If “Pr interference” > CCA Threshold, the STA will not transmit SHARE “Blocked” and “Share” terminology “Blocked” – Transmission allowed when SNIR < 20dB, then both signals fail. “Share” – Transmission prevented when SNIR < 20dB, standard contention. Graham Smith, SR Technologies

11 DSC and Color DSC (as per this analysis) Color May 2016
STA measures the Beacon signal (wanted DL signal) and sets effective CCA Threshold 20dB lower. (DSC Margin = 20dB) AP sets its effective CCA level at 10dB below the lowest received wanted signal. DSC AP can prohibit DSC usage in its network. Color STA/AP looks at color bits in preamble to determine if signal is from same or inter BSS. If not same BSS, ignore signal. (A variation is to only reject if the inter BSS signal is lower than a set threshold) Graham Smith, SR Technologies

12 May 2016 TPC from 15/1609 Adjusted TX_PWR =  15 – RSSI + A            -5<TX_PWR<15 dBm Assume the STA is close to the AP then RSSImax = -35dBm and TX_PWR = -5dBm TX_PWR = 15 – (-35) + A = -5 Hence, A = -55dB  For RSSI = -55dBm, TX_PWR = 15dBm Graham Smith, SR Technologies

13 Display of results – Shared and Blocked
May 2016 Display of results – Shared and Blocked The number of Shared and Blocked links is calculated and the results tabulated. “DL STAs”, out of all the combinations (4096 for Indoor enterprise and 576 for cell enterprise) Due to interference from the STAs in other network # links Shared, # links blocked “DL” APs, out of all the combinations (64 for Indoor enterprise and 24 for cell enterprise) Due to interference from the AP in other network “UL STAs”, out of all the combinations (4096 for Indoor enterprise and 576 for cell enterprise) Due to interference from the STAs in the other network “DL APs”, out of all the combinations (64 for Indoor enterprise and 24 for cell enterprise) Due to interference from the AP in other network Graham Smith, SR Technologies

14 Display of results – Figure of Merit
May 2016 Display of results – Figure of Merit In order to produce a nice “easy to compare” illustration, a ‘Figure of Merit’ is used. Success = 1, Shared = 0.5, Blocked = 0 Merit = (# links – (# shared + # blocked) + # shared x 0.5)/(# links) Examples: Total # links = 4096, Shared = 4096, Blocked = 0 Merit = (4096 – (4096 x 0.5))/4096 = 0.5 (i.e. all shared) Total # links = 4096, Shared = 0, Blocked = 0 Merit = (4096 – 0 + (0 x 0.5))/4096 = 1 (perfect, no OBSS) Total # links = 4096, Shared = 0, Blocked = 4096 Merit = (4096 – (0 x 0.5))/4096 = 0 (totally blocked) Total # links = 4096, Shared = 768, Blocked = 698 Merit = (4096 – (768 x 0.5))/4096 = Graham Smith, SR Technologies

15 Results Indoor Enterprise 4CH, 15dBm, 7dB
May 2016 Results Indoor Enterprise 4CH, 15dBm, 7dB 4CH TX 15dBm, 7dB wall DL UL STAs AP Merit Share Block Legacy 0.5 4096 64 Legacy/TPC 1408 768 8 Color 6 2 128 0.4375 36 Color/TPC 1 122 62 DSC 34 DSC/TPC DSC/TPC one 0.875 1024 4090 DSC and Color are best TPC on STAs causes UL AP interference to block due to AP not TPC Graham Smith, SR Technologies

16 Results Indoor Enterprise 4CH, 18dBm, 3dB
May 2016 Results Indoor Enterprise 4CH, 18dBm, 3dB 4CH TX 18dBm, 3dB wall DL UL STAs AP Merit Share Block Legacy 0.5 4096 64 Legacy/TPC 3484 Color 0.8125 768 22 1408 0.3125 44 Color/TPC 1 DSC 698 DSC/TPC 42 DSC/TPC one 3584 6 3328 DSC is best all round TPC improves DL STAs TPC on STAs causes UL AP interference to block due to AP not TPC Graham Smith, SR Technologies

17 Results Indoor Enterprise 9CH, 18dBm, 3dB
May 2016 Results Indoor Enterprise 9CH, 18dBm, 3dB 9CH TX 18dBm, 3dB wall DL UL STAs AP Merit Share Block Legacy 0.5 4096 64 Legacy/TPC 1920 Color 1 Color/TPC DSC DSC/TPC DSC/TPC one DSC and Color are best Spatial Re-use!!!! TPC on STAs causes UL AP interference to block due to AP not TPC Graham Smith, SR Technologies

18 Results Indoor Cell Enterprise 3CH, 15dBm, 0dB
May 2016 Results Indoor Cell Enterprise 3CH, 15dBm, 0dB 3CH TX 15dBm, 0dB wall DL UL STAs AP Merit Share Block Legacy 0.5 576 24 Legacy/TPC 564 12 Color 378 Color/TPC 132 DSC 288 141 368 208 DSC/TPC 192 30 127 449 DSC/TPC one 366 210 Legacy is best DSC is close second (Note: DSC can be disabled by AP if it recognizes such a situation) Particularly strong OBSS as cells adjacent to each other. Graham Smith, SR Technologies

19 Results Indoor Cell Enterprise 7CH, 18dBm, 0dB
May 2016 Results Indoor Cell Enterprise 7CH, 18dBm, 0dB 7CH TX 18dBm, 0dB wall DL UL STAs AP Merit Share Block Legacy 0.5 576 24 Legacy/TPC 264 210 Color 14 2 1 0.75 6 Color/TPC DSC 4 DSC/TPC 22 DSC/TPC one 154 DSC is best. Spatial Reuse. TPC improves DL and UL STAs But blocks UL AP Graham Smith, SR Technologies

20 Results Indoor Cell Enterprise 7CH, 18dBm, 2dB
May 2016 Results Indoor Cell Enterprise 7CH, 18dBm, 2dB 7CH TX 18dBm, 2dB wall DL UL STAs AP Merit Share Block Legacy 264 0.5 24 420 Legacy/TPC 1 22 Color Color/TPC DSC DSC/TPC DSC/TPC one Assume a little obstruction loss and perfect Spatial Reuse with Color and DSC Graham Smith, SR Technologies

21 Discussion of results – Enterprise
May 2016 Discussion of results – Enterprise DSC performs the best overall Color performs close to DSC TPC improves DL and UL STAs interference TPC blocks UL AP interference (AP not TPC) Devise a TPC method for the AP? Graham Smith, SR Technologies

22 Discussion of results – Cell Enterprise
May 2016 Discussion of results – Cell Enterprise DSC performs well in 3CH, but legacy is better Color performs bad in 3CH case TPC improves DL STAs interference DSC and color provide great spatial reuse for 7CH case Graham Smith, SR Technologies

23 DSC or Color? Color DSC May 2016
Provides improved OBSS performance UL and DL Will block UL and DL ‘overlapping’ packets rather than share. Only works if ALL STAs and APs in OBSSs have the feature Relies on the OTHER DEVICES having the feature as well Will NOT work with legacy OBSS STAs and/or AP. Note: Color was originally proposed for a particular PHY, so met the above requirements DSC Tends to share ‘overlapping’ packets UL, blocks DL Works with OBSS legacy STAs and/or legacy AP Results presented are for the ‘wanted’ BSS, other BSS can be legacy. DSC is implemented by the STA, can be independent There is an incentive for a STA to use DSC. Graham Smith, SR Technologies

24 May 2016 TPC? TPC can improve STAs interference but unless APs also use TPC it results in blocking of the AP interference If overlapping network is not using TPC, then do not use TPC in the wanted network. All STAs and APs must use TPC for it to be effective No real incentive for a STA to use TPC as it as it makes the STA vulnerable. NOTE: A TPC scheme for APs may be possible, but still problem with legacy. Graham Smith, SR Technologies

25 Discussion and Conclusion
May 2016 Discussion and Conclusion Both Color and DSC provide improvements in Spatial Re-Use Color will not work until ALL STA/APs have the feature (designed for an independent PHY) Color is in the 11ax SFD TPC only works if ALL STA AND APs use the feature. If just STAs use TPC then results are worse. DSC with TPC is in the 11ax SFD DSC works, is completely defined, easy to implement and has more analysis than any other Spatial Reuse scheme. DSC presents a good incentive for a vendor to adopt. Does not rely on other STAs having it. Text for DSC has been proposed 16/0310r1. This presentation shows that overall DSC performs better than Color or DSC/TPC in the evaluated scenarios. Graham Smith, SR Technologies

26 May 2016 Straw Poll DSC text should be incorporated into the Draft 11ax Amendment Note: 16/0310 may be used as a basis. Y N A Graham Smith, SR Technologies

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