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Doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 1 Market Acceptability Throughput Issues for HRb.

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Presentation on theme: "Doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 1 Market Acceptability Throughput Issues for HRb."— Presentation transcript:

1 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 1 Market Acceptability Throughput Issues for HRb Mark Webster and Karen Halford Intersil Corporation May 2000 This Microsoft Powerpoint presentation has notes attached. Please expand to “Notes Page View” mode.

2 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 2 Data Rate Needs AV from DVD AV from digital VCR Networked printer Video gaming Internet browsing HDTV  6 - 10 Mbps*  4 - 8 Mbps*  4 Mbps*  2 Mbps*  20 Mbps* There is typically a need for 2 or more applications to run simultaneously. * These numbers were taken from HomeRF’s technical requirements document. Required Throughput: 20 Mbps

3 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 3 802.11a Throughput Calculations SyncHeader MPDU: X Bytes Ack # Bits: Rate: Time:8 usec 8*X bits R MBPS 8*X/R usec 112 bits 2 MBPS 56 usec OFDM Throughput = 8*X Mbps / (8+8+8*X/R+16+8+8+ 56) SyncHeader 16 usec8 usec

4 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 4 802.11b Throughput Calculations SyncSFDHeader MPDU: X Bytes AckSyncSFDHeader # Bits: Rate: Time: 128 bits 1 MBPS 128 usec 16 bits 1 MBPS 16 usec 48 bits 1 MBPS 48 usec 8*X bits R MBPS 8*X/R usec 128 bits 1 MBPS 128 usec 16 bits 1 MBPS 16 usec 48 bits 1 MBPS 48 usec 112 bits 2 MBPS 56 usec LONG PREAMBLE Throughput = 8*X Mbps/ (128+16+48+8*X/R+10+128+16+48+56) usec 10 usec SyncSFDHeader MPDU: X Bytes AckSyncSFDHeader # Bits: Rate: Time: 56 bits 1 MBPS 56 usec 16 bits 1 MBPS 16 usec 48 bits 2 MBPS 24 usec 8*X bits R MBPS 8*X/R usec 56 bits 1 MBPS 56 usec 16 bits 1 MBPS 16 usec 48 bits 2 MBPS 24 usec 112 bits 2 MBPS 56 usec SHORT PREAMBLE 10 usec Throughput = 8*X Mbps / (56+16+24+8*X/R+10+56+16+24+56) usec

5 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 5 Throughput Comparison of 802.11a for Rates of 12, 24 and 36 Mbps

6 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 6 Throughput Comparison of 802.11b for Rates of 11, 22 and 33 Mbps Long Preamble Short Preamble

7 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 7 Throughput Comparison of 802.11a vs. 802.11b for Rates of 12 and 11 Mbps

8 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 8 Throughput Comparison of 802.11a vs. 802.11b for Rates of 24 and 22 Mbps

9 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 9 Throughput Comparison of 802.11a vs. 802.11b for Rates of 36 and 33 Mbps

10 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 10 Realistic Impairments and Considerations Not Included in This Analysis Packet Errors cause retransmission. PCF/DCF Modes Packet collisions Backoff mechanism to avoid collision MAC Enhancements

11 doc.: IEEE 802.11-00/072 Submission May 2000 Mark Webster and Karen Halford, Intersil Corporation Slide 11 Conclusions Effective throughput can be increased by shortening the preamble. 802.11a achieves 20 Mbps throughput for rates of 24 Mbps and higher. 802.11b achieves 20 Mbps throughput for rates of 33 Mbps and higher. In an error-free environment, longer packets increase throughput. In realistic environment longer packets may reduce throughput due to more/longer retransmissions due to errors

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