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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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Presentation on theme: "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."— Presentation transcript:

1 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 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 Authors: November 2008

2 doc.: IEEE 802.19-08/30r2 SubmissionMukul 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

3 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 3Mukul Goyal, U Wisconsin Milwaukee

4 doc.: IEEE 802.19-08/30r2 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 4Mukul Goyal, U Wisconsin Milwaukee

5 doc.: IEEE 802.19-08/30r2 Submission The CSMA/CA algorithm in (unslotted) 802.15.4 If the CCA fails even after 4 th 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 5Mukul Goyal, U Wisconsin Milwaukee

6 doc.: IEEE 802.19-08/30r2 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 3 rd retry, the source node declares a collision failure and abandons the packet. November 2008 Slide 6Mukul Goyal, U Wisconsin Milwaukee

7 doc.: IEEE 802.19-08/30r2 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 7Mukul Goyal, U Wisconsin Milwaukee

8 doc.: IEEE 802.19-08/30r2 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 8Mukul Goyal, U Wisconsin Milwaukee

9 doc.: IEEE 802.19-08/30r2 Submission The 802.15.4-802.11 Test Bed: Top View November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 9 40” 70” 9” 12” 802.15.4 node 802.11 AP 802.11 node 802.15.4 Coord 6” 2” 10” 6”

10 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 802.11 node 802.15.4 Coord 6” 3”

11 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 11Mukul Goyal, U Wisconsin Milwaukee

12 doc.: IEEE 802.19-08/30r2 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 12Mukul Goyal, U Wisconsin Milwaukee

13 doc.: IEEE 802.19-08/30r2 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 13Mukul Goyal, U Wisconsin Milwaukee

14 doc.: IEEE 802.19-08/30r2 Submission Scenario 1: IEEE 802.11n on Channel 6, 40 MHz wide November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 14 Control Channel

15 doc.: IEEE 802.19-08/30r2 Submission November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 15

16 doc.: IEEE 802.19-08/30r2 Submission Scenario 1: Changes in IEEE 802.11n Traffic Load During an Experiment November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 16

17 doc.: IEEE 802.19-08/30r2 Submission Scenario 1: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Loss Rate November 2008 Slide 17Mukul Goyal, U Wisconsin Milwaukee

18 doc.: IEEE 802.19-08/30r2 Submission Scenario 1: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Latency November 2008 Slide 18Mukul Goyal, U Wisconsin Milwaukee

19 doc.: IEEE 802.19-08/30r2 Submission Scenario 2: IEEE 802.11n on Channel 1, 40 MHz wide November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 19

20 doc.: IEEE 802.19-08/30r2 Submission November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 20

21 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

22 doc.: IEEE 802.19-08/30r2 Submission Scenario 2: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Loss Rate November 2008 Slide 22Mukul Goyal, U Wisconsin Milwaukee

23 doc.: IEEE 802.19-08/30r2 Submission Scenario 2: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Latency November 2008 Slide 23Mukul Goyal, U Wisconsin Milwaukee

24 doc.: IEEE 802.19-08/30r2 Submission Scenario 3: IEEE 802.11n on Channel 4, 20 MHz wide November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 24

25 doc.: IEEE 802.19-08/30r2 Submission Scenario 3: Changes in IEEE 802.11n Traffic Load During an Experiment November 2008 Mukul Goyal, U Wisconsin MilwaukeeSlide 25 Packet Payload: 1470B

26 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 26Mukul Goyal, U Wisconsin Milwaukee

27 doc.: IEEE 802.19-08/30r2 Submission Scenario 3: Impact of IEEE 802.11n Operation on IEEE 802.15.4 Latency November 2008 Slide 27Mukul Goyal, U Wisconsin Milwaukee

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