submission doc.: ieee 802.11-15/1039r0 chuck lukaszewski et al. aruba networks, an hp company...
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Spatial Reuse Measurements
September, 2015
Slide 1
Date: 2015-08-07
Authors:
Name Affiliations Address email
Chuck LukaszewskiAruba Networks,an HP Company Sunnyvale, CA
Liang Li [email protected]
Partha Narasimhan [email protected]
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Abstract• The SR ad hoc has defined a calibration scenario in [1], and
nine companies have presented initial findings in [2] & [3].
• This contribution adds empirical, open air measurements using modified ED & preamble detect (PD) thresholds.• We find that spatial reuse using manually fixed PD controls on AP and
STA is real for very short AP-STA distances (3 meters)
• Results for 2 concurrent BSS are provided at four different inter-BSS distances, for both 2 STA and 6 STA cases
• Results for 3 concurrent BSS are provided, for 2 STA case
• When taken together with simulation results, TGax should pursue development of SR techniques.
September, 2015
Slide 2
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Linear Reuse Testbed
• Based on 15/0652r1
• 5 BSS
• Each BSS has 3 nodes:• (1) 802.11ac 3SS AP
• (2) 802.11ac 2SS laptop
• 10m inter-BSS distance
• 3m STA – AP distance
• 1m inter-STA distance
• Manual fixing of ED/PD thresholds on all nodes
September, 2015
Slide 3
10m
A1
S5-A
S1-ABSS1
BSS5
20m
30m
40m
A4 S4-ABSS4
A3 S3-ABSS3
A2 S2-ABSS2
S5-B
S1-B
S4-B
S3-B
S2-B
3m
3m
3m
3m
3m 0m
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Reference Deployment Scenario in 15/0652r1
September, 2015
Slide 4
30m3m3m
AP1 AP2
STA2 STA4
STA1 STA3
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Key Differences from Calibration Scenario
• Testing in this contribution differs from 15/0652r1 in the following ways:• VHT20 (vs. VHT80)
• AP EIRP = 15 dBm (vs. 20) / STA EIRP = 15 dBm (vs. 13)
• Floating data MCS (vs. fixed MCS5)
• Up to 64 MPDUs per A-MPDU (vs. 32)
• Bidirectional (vs. UL only)
• SGI enabled
• Beacons enabled
• RTS/CTS enabled
• PD thresholds -85 / -75 / -65 / -55 (vs. -76 / -66 / -56)
September, 2015
Slide 5
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Lab Building Floor Plan with AP/STA Locations
September, 2015
Slide 6
BSS1
BSS2
BSS3
BSS4
BSS5
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Viewing BSS2 – BSS5 from BSS1
September, 2015
Slide 7
AP3
AP4
AP5
STA3
STA4STA5
AP2
STA2
3m
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Testbed Configuration
BSS & RF:
** 15/0652r1 calls for VHT80. VHT20 used in this contribution.
Test Automation:
September, 2015
Slide 8
Traffic generation platform IxChariot 8.1Traffic type UDP (payload 1460 bytes)Traffic direction DL and ULSend data rate (per STA) Unlimited (DL), 75 per STA Mbps(UL)Number of data flows 2 data flows, Unlimited send rate (DL)
5 data flows, 15 Mbps per flow (UL)Link between each STA and Wired Endpoint
1 Gbps
Channel 120Modulation VHT20**STA EIRP 15 dBmAP EIRP 15 dBmControl Rate 6 Mbps
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Inter-BSS RSSI Calibration
September, 2015
Slide 9
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Intra-BSS RSSI Calibration (Typical)
September, 2015
Slide 10
AP
Station A
1m
Station B
3m 3m
AP STA A STA B
AP -37 dBm -39 dBm
STA A -47 dBm -35 dBm
STA B -44 dBm -38 dBm
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Single BSS Calibration – PD= -85 / ED = -62(UDP Goodput & MCS Distribution)
September, 2015
Slide 11
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 2 STA Goodput (VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 12
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 2 STA Goodput (Downstream VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 13
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 2 STA Goodput (Upstream VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 14
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Linear Reuse Testbed
• Based on 15/0652r1
• 5 BSS
• Each BSS has 3 nodes:• (1) 802.11ac 3SS AP
• (2) 802.11ac 2SS laptop
• 10m inter-BSS distance
• 3m STA – AP distance
• 1m inter-STA distance
• Manual fixing of ED/PD thresholds on all nodes
September, 2015
Slide 15
10m
A1
S5-A
S1-ABSS1
BSS5
20m
30m
40m
A4 S4-ABSS4
A3 S3-ABSS3
A2 S2-ABSS2
S5-B
S1-B
S4-B
S3-B
S2-B
3m
3m
3m
3m
3m 0m
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 6 STA Tests
• Increase STA counts in each BSS from 2 STAs to 6 STAs
• Repeat sweep of PD/ED settings at 10m / 20m / 30m / 40m
• Characterize per-STA fairness in up & down directions
September, 2015
Slide 16
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 6 STA Goodput (Downstream VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 17
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 6 STA Fairness (Downstream VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 18
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 6 STA Goodput (Upstream VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 19
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
2 BSS / 6 STA Fairness (Upstream VHT20)D = 10m/20m/30m/40m PD = -55 / -65 / -75 / -85
September, 2015
Slide 20
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Test Design – 3 BSS / 2 STA
September, 2015
Slide 21
BSS4
BSS6
BSS7
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Results: 3 BSS / 2 STA (Down)
September, 2015
Slide 22
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Results: 3 BSS / 2 STA (Up)
TBD
September, 2015
Slide 23
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
Conclusions
• Spatial reuse via PD threshold tuning is real.
• Improvement scales with BSS count, but linearity depends on many factors including inter-BSS distance, intra-BSS distance and supportable MCS.
• Per-STA and Per-BSS fairness appears to be generally good in presence of OBSS noise.
• Minimum viable SR distance is ~30m in free space.• Diminishing or no return at smaller distances
• Possibly due to SINR compression reducing maximum supportable MCS rate
• Should the calibration scenario be increased to sweep longer distances?
September, 2015
Slide 24
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Submission
doc.: IEEE 802.11-15/1039r0
Chuck Lukaszewski et al.Aruba Networks, an HP Company
References
[1] 15/0652r1 – “Reference Simulation Model for Dynamic CCA / DSC Calibration”, M Mori, Y Morioka et al (Sony, SR, Nokia, MediaTek, Broadcom), May 2015
[2] 15/0801r0 - “DCCA/DSC Reference Simulation Results”, M Mori, Y Morioka et al (Sony, WILUS, NTT, SR, Broadcom, LG, MediaTek), July 2015
[3] 15/886r0 - “DSC Calibration Result”, C Yu, F Hsu et al (MediaTek), July 2015
March, 2015
Slide 25