doc.: IEEE 802.19-08/30r2 Submission Mukul Goyal, U Wisconsin Mi Slide 1 Impact of IEEE 802.11n Operation On IEEE 802.15.4 Performance Notice: This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Date: 2008-11-11 N am e C om pany A ddress Phone em ail M ukulG oyal U W isconsin M ilwaukee 3200 N Cram erSt, M ilwaukee W I 53201 1-414-229- 5001 m ukul@ uwm .edu Y usufBashir Johnson ControlsInc. 507 E M ichigan St, M ilwaukee W I 53202 1-414-526- 8380 Yusuf.Bashir@ jci.com BalajiPolepalli Ram esh U W isconsin M ilwaukee 3200 N Cram erSt, M ilwaukee W I 53201 brpjr@ uwm.edu W eigao Xie U W isconsin M ilwaukee 3200 N Cram erSt, M ilwaukee W I 53201 wxie@ uwm .edu Authors: November 2008
Doc.: IEEE 802.19-08/30r2 SubmissionMukul Goyal, U Wisconsin MilwaukeeSlide 1 Impact of IEEE 802.11n Operation On IEEE 802.15.4 Performance Notice: This.
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doc.: IEEE /30r2 Submission IEEE : Overview A MAC/PHY layer protocol for low power, low data rate (< 250 kbps) wireless sensor applications Based on CSMA/CA November 2008 Slide 3Mukul Goyal, U Wisconsin Milwaukee
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doc.: IEEE 802.19-08/30r2
Submission Mukul Goyal, U Wisconsin MilwaukeeSlide 1
Impact of IEEE 802.11n Operation On IEEE 802.15.4 Performance
Notice: This document has been prepared to assist IEEE 802.19. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
Date: 2008-11-11
Name Company Address Phone email Mukul Goyal U Wisconsin
Milwaukee 3200 N Cramer St, Milwaukee WI 53201
1-414-229-5001
Yusuf Bashir Johnson Controls Inc.
507 E Michigan St, Milwaukee WI 53202
1-414-526-8380
Balaji Polepalli Ramesh
U Wisconsin Milwaukee
3200 N Cramer St, Milwaukee WI 53201
Weigao Xie U Wisconsin Milwaukee
3200 N Cramer St, Milwaukee WI 53201
Authors:
November 2008
doc.: IEEE 802.19-08/30r2
Submission Mukul Goyal, U Wisconsin MilwaukeeSlide 2
Abstract
In this presentation, we evaluate the impact of IEEE 802.11n operation on IEEE 802.15.4 performance via test bed experiments. The IEEE 802.15.4 performance is measured in terms of packet loss rate and the latency for successfully delivered packets.
November 2008
doc.: IEEE 802.19-08/30r2
Submission
IEEE 802.15.4: Overview
• A MAC/PHY layer protocol for low power, low data rate (< 250 kbps) wireless sensor applications
• Based on CSMA/CA
November 2008
Slide 3 Mukul Goyal, U Wisconsin Milwaukee
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Submission
The CSMA/CA algorithm in (unslotted) 802.15.4
• The source node backoffs for a random number of slots between 0 and (2^BE) – 1– BE is Backoff Exponent
• After the backoff, the source node does the clear channel assessment (CCA)
• If the channel is not idle (CCA Failure), the source node increments BE and repeat the process up to 4 times– The initial BE value is 3 and max BE value is 5
November 2008
Slide 4 Mukul Goyal, U Wisconsin Milwaukee
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Submission
The CSMA/CA algorithm in (unslotted) 802.15.4
• If the CCA fails even after 4th retry, the source node declares channel access failure (CAF) and abandons the packet transmission
• If the CCA succeeds, the source node transmits the packet.
• On receiving the packet, the destination optionally sends an acknowledgement back
November 2008
Slide 5 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Collisions and Retransmissions
• If the packet or the ack suffers a collision, the source node waits for a certain time duration and then repeats the (backoff + transmission) process up to 3 more times.
• If the ack is not received even after the 3rd retry, the source node declares a collision failure and abandons the packet.
November 2008
Slide 6 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Packet Loss in IEEE 802.15.4
• Channel access failure– channel access failure occurs after 5 back-to-back CCA
failures during a try.• Collision failure
– occurs after failure to receive the ack even after 4 tries.• Note that a channel access failure causes
abandonment of packet transmission attempt even if 4 tries have not been made.
November 2008
Slide 7 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Impact of IEEE 802.11n operation on IEEE 802.15.4 Performance
• IEEE 802.15.4 performance is measured in terms of the packet loss rate and latency for successfully delivered packets.
• We plot the increase in average loss rate/latency values for IEEE 802.15.4 nodes due to the presence of an IEEE 802.11n network.
November 2008
Slide 8 Mukul Goyal, U Wisconsin Milwaukee
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Submission
The 802.15.4-802.11 Test Bed: Top View
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 9
40”
70”
9”
9”
9”
9”
9”
9”
9”
9”
12” 12” 12” 12”
802.15.4 node
802.11 AP802.11node
802.15.4Coord
6”2”
10”6”
doc.: IEEE 802.19-08/30r2
Submission
The 802.15.4-802.11 Test Bed: Front View
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 10
9”
802.15.4 node
802.11 AP
802.11node
802.15.4Coord
6”
3”
doc.: IEEE 802.19-08/30r2
Submission
Traffic in IEEE 802.15.4 Network
• 15 nodes sending packets to the coordinator.• The packet size is 112 bytes.• Each node sends on average one packet per second
(poisson distributed) for 15 minutes• IEEE 802.15.4 network uses a 3 MHz wide channel
centered at 2425 MHz (Channel 15)• Power level: 10dBm
November 2008
Slide 11 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Traffic in IEEE 802.11n Network
• An iperf client sends a UDP stream to an iperf server over an IEEE 802.11n network
• Power level 17dBm• Packet size: 1470 B, 63 KB• Client generates traffic at different rates• The 802.11n AP and cards follow draft 2.0 • The cards use OFDM, 64-QAM with coding rate of 5/6• The PHY rate was 270Mbps
November 2008
Slide 12 Mukul Goyal, U Wisconsin Milwaukee
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Submission
IEEE 802.11n Channels Used
• Scenario 1: Channel 6, 40 MHz wide (extends towards channel 11), no overlap with IEEE 802.15.4 channel
• Scenario 2: Channel 1, 40 MHz wide, extends into the channel used by IEEE 802.15.4 network
• Scenario 3: Channel 4, 20 MHz wide, overlaps the channel used by IEEE 802.15.4 network
November 2008
Slide 13 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Scenario 1: IEEE 802.11n on Channel 6, 40 MHz wide
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 14
Control Channel
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Submission
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 15
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Submission
Scenario 1: Changes in IEEE 802.11n Traffic Load During an Experiment
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 16
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Submission
Scenario 1: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Loss Rate
November 2008
Slide 17 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Scenario 1: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Latency
November 2008
Slide 18 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Scenario 2: IEEE 802.11n on Channel 1, 40 MHz wide
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 19
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Submission
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 20
doc.: IEEE 802.19-08/30r2
Submission
Scenario 2: Changes in IEEE 802.11n Traffic Load During an Experiment
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 21
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Submission
Scenario 2: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Loss Rate
November 2008
Slide 22 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Scenario 2: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Latency
November 2008
Slide 23 Mukul Goyal, U Wisconsin Milwaukee
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Submission
Scenario 3: IEEE 802.11n on Channel 4, 20 MHz wide
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 24
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Submission
Scenario 3: Changes in IEEE 802.11n Traffic Load During an Experiment
November 2008
Mukul Goyal, U Wisconsin MilwaukeeSlide 25
Packet Payload: 1470B
doc.: IEEE 802.19-08/30r2
Submission
Scenario 3: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Loss Rate
November 2008
Slide 26 Mukul Goyal, U Wisconsin Milwaukee
doc.: IEEE 802.19-08/30r2
Submission
Scenario 3: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Latency
November 2008
Slide 27 Mukul Goyal, U Wisconsin Milwaukee
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