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Doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 1 PHY and MAC Throughput Analysis with 80.

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Presentation on theme: "Doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 1 PHY and MAC Throughput Analysis with 80."— Presentation transcript:

1 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 1 PHY and MAC Throughput Analysis with 80 MHz for VHT below 6 GHz Date: 2008/05/09 Authors:

2 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 2 Abstract This presentation shows the achievable PHY data rate and MAC throughput for VHT below 6 GHz with 80 MHz channel bandwidth with PHY and MAC optimizations

3 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 3 Overview Previous MAC throughput results 80 MHz PHY configuration 802.11n MAC A-MPDU limitations New MAC throughput results

4 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 4 Previous MAC Throughput Analysis Using 800 ns GI: 540Mbps x 2 = 1080Mbps PER ~ 0.11 No limit on the maximum size of A-MPDU Number of MPDUs in one A-MPDU up to 64 11-07-2431-00-0vht-analysis-on-ieee-802-11n-mac-efficiency.ppt

5 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 5 80 MHz PHY Simulation 80 MHz PHY simulation was developed based on 802.11n 40 MHz To avoid partial overlap with 40 MHz TGn, we chose to use 80 MHz New allocation of data and pilot tones to support 80 MHz –20 MHz 802.11n: 52 data tones and 4 pilot tones –40 MHz 802.11n: 108 data tones and 6 pilot tones –New 80 MHz: 224 data tones and 10 pilot tones New MCSs for higher PHY data rates –Code rate 7/8, 64 QAM for 4 streams : 1.307 Gbps –Code rate 3/4, 256 QAM for 4 streams : 1.493 Gbps

6 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 6 PHY Simulation Overview For comparison purposes, the same TGn channel model was used in the 80 MHz simulator Simulations were run with all the impairments listed in CC67 (comparison criteria) with the exception of the PA –To avoid lengthy simulation time required by TGn PA model over sampling requirement, PA was not included in the simulations –Based on previous work in early days in TGn it is expected that additional 2 dB backoff would be required for 256 QAM Packet size was 3000 bytes SNR of 40 dB was selected for the MAC results to provide an optimistic operating point 800 ns GI was used for the simulations, however 400 ns GI was used to compute the data rate to maximize the throughput

7 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 7 PHY Data Rates and PER at 40dB SNR (1) - Square configurations (2x2, 3x3, and 4x4) MCSConfigurationCode Rate ModulationData Rate (400 ns GI) 80MHz PER at 40 dB SNR – TGn channel model D PER at 40 dB SNR - TGn channel model B 142x2 2 Stream3/464 QAM560 Mbps0.0 %*1.5 % 152x2 2 Stream5/664 QAM622 Mbps0.3 %4.6 % new2x2 2 Stream7/864 QAM653 Mbps1.7 %11.9 % new2x2 2 Stream3/4256 QAM747 Mbps3.7 %18.4 % 223x3 3 Stream3/464 QAM840 Mbps0.0 %13.9 % 233x3 3 Stream5/664 QAM933 Mbps1.0 %31.6 % new3x3 3 Stream7/864 QAM980 Mbps4.6 %43.6 % new3x3 3 Stream3/4256 QAM1.120 Gbps10.5 %69.1 % 304x4 4 Stream3/464 QAM1.120 Gbps0.3 %48.9 % 314x4 4 Stream5/664 QAM1.244 Gbps5.5 % 76.6 % new4x4 4 Stream7/864 QAM1.307 Gbps17.6 % 88.5 % new4x4 4 Stream3/4256 QAM1.493 Gbps29.5 %97.7 % *) Note: 0% PER means less then 15 errors in 15,000 packets

8 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 8 PHY Data Rates and PER at 40dB SNR (2) - Rx diversity (2x3, 3x4, and 4x5) MCSConfigurationCode Rate ModulationData Rate (400 ns GI) 80MHz PER at 40 dB SNR – TGn channel model D PER at 40 dB SNR – TGn channel model B 142x3 2 Stream3/464 QAM560 Mbps0.0 % *0.0 % 152x3 2 Stream5/664 QAM622 Mbps0.0 % new2x3 2 Stream7/864 QAM653 Mbps0.0 % new2x3 2 Stream3/4256 QAM747 Mbps0.0 % 223x4 3 Stream3/464 QAM840 Mbps0.0 % 233x4 3 Stream5/664 QAM933 Mbps0.0 %0.3 % new3x4 3 Stream7/864 QAM980 Mbps0.0 %0.8 % new3x4 3 Stream3/4256 QAM1.120 Gbps0.0 %6.4 % 304x5 4 Stream3/464 QAM1.120 Gbps0.0 %0.7 % 314x5 4 Stream5/664 QAM1.244 Gbps0.0 %6.2 % new4x5 4 Stream7/864 QAM1.307 Gbps0.0 %11.1 % new4x5 4 Stream3/4256 QAM1.493 Gbps0.0 %45.3 % *) Note: 0% PER means less then 40 errors in 15,000 packets

9 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 9 MAC Throughput Analysis with PHY Results Assume A-MPDU aggregation with RTS/CTS exchange MAC throughput A-MPDU limitations in 802.11n –Maximum size of A-MPDU = 64KB –Maximum number of MPDUs in one A-MPDU =64 MPDUs MAC throughput = Total MAC payload (bits) Time to transmit total MAC payload (sec) MAC efficiency = MAC throughput PHY rate (1-PER) 

10 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 10 MAC Throughput Results - Channel model D with the limitations in A-MPDU Square configurationsRx diversity configurations With the limitations in A-MPDU No PHY configurations meet 1Gbps MAC throughput 2x2 3x3 4x4 2x3 3x4 4x5

11 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 11 MAC Throughput Results - Channel model D without the limitations in A-MPDU Without the limitations in A-MPDU –Maximum size of A-MPDU > 64KB –Maximum number of MPDUs in one A-MPDU > 64 MPDUs 4x4 configuration just barely meets 1 Gbps MAC throughput For reliable 1 Gbps MAC throughput requires 5 antennas To achieve 1.3 Gbps MAC throughput required A-MPDU of length 510 Kbytes (168 MPDUs aggregation) Square configurationsRx diversity configurations 2x2 3x3 4x4 2x3 3x4 4x5

12 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 12 MAC Throughput Results - Channel model B without the limitations in A-MPDU Without the limitations in A-MPDU Even with no limitations in A-MPDU, 4 antennas doesn’t come close to achieving 1 Gbps MAC throughput 5 antennas just barely meets 1Gbps MAC throughput Square configurationsRx diversity configurations 2x2 3x3 4x4 2x3 3x4 4x5

13 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 13 Conclusions Even with the PHY and MAC optimizations, 4x4 will not reliably achieve 1Gbps MAC throughput To achieve 1 Gbps MAC throughput required –40 dB SNR –5 antennas –510 Kbytes aggregate The study group has two choices –Lower the throughput number in the below 6 GHz scope –Clarify in the below 6 GHz scope that 1 Gbps MAC throughput is optional in a device

14 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 14 Backup

15 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 15 PHY Simulation Results - Square configurations over channel model D Configurations: 2x2, 3x3, and 4x4 TGn channel model D Channel bandwidth: 80 MHz Packet size = 3000 bytes

16 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 16 PHY Simulation Results - Square configurations over channel model B Configurations: 2x2, 3x3, and 4x4 TGn channel model B Channel bandwidth: 80 MHz Packet size = 3000 bytes

17 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 17 PHY Simulation Results - Rx diversity configurations over channel model D Configurations: 2x3, 3x4, and 4x5 TGn channel model D Channel bandwidth: 80 MHz Packet size = 3000 bytes

18 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 18 PHY Simulation Results - Rx diversity configurations over channel model B Configurations: 2x3, 3x4, and 4x5 TGn channel model B Channel bandwidth: 80 MHz Packet size = 3000 bytes

19 doc.: IEEE 802.11-08/0535r0 Submission May 2008 Thomas Kenney, Minyoung Park, Eldad Perahia, Intel Corp. Slide 19 MAC Throughput Results - Channel model B with the limitations in A-MPDU Channel model B With the limitations in A-MPDU Square configurationsRx diversity configurations

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