11 02 0138-00-0wng Throughput Analysis for Ieee 802 11a Higher Data Rates
Doc.: IEEE 802.11-06-1642-00-0wng Submission November 2006 Thanasis Korakis, Polytechnic...
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Novembe r 2006 Thana sis K oraki Slide 1 doc.: IEEE 802.11-06-1642-00-0wng Submission CoopMAC: A cooperative MAC compliant with IEEE 802.11 Notice: This document has been prepared to assist IEEE 802.11. 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. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures < http:// ieee802.org/guides/bylaws/sb-bylaws.pdf >, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <[email protected] > as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If Date: 2006-11-13 N am e Com pany Address Phone em ail Thanasis Korakis Polytechnic University 5 Metrotec h Center, Brooklyn,NY 11201 (718)260-3871 korakis@p oly. edu Jeff reyTao Mitsubishi Research Labs 201Broadwa y, Cam bridge, M A 02139 (617) 621-7557 tao@merl. com Shivendra Panw ar Polytechnic University 5 Metrotec h Center, Brooklyn,NY 11201 (718)260-3740 panw ar@ catt.p oly.e du Authors:
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Transcript of Doc.: IEEE 802.11-06-1642-00-0wng Submission November 2006 Thanasis Korakis, Polytechnic...
November 2006
Thanasis Korakis, Polytechnic University
Slide 1
doc.: IEEE 802.11-06-1642-00-0wng
Submission
CoopMAC: A cooperative MAC compliant with IEEE 802.11
Notice: This document has been prepared to assist IEEE 802.11. 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.
Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11.
Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <[email protected]> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <[email protected]>.
Date: 2006-11-13
Name Company Address Phone email Thanasis Korakis Polytechnic
University 5 Metrotech Center, Brooklyn, NY 11201
(718) 260-3871 [email protected]
Jeffrey Tao Mitsubishi Research Labs
201 Broadway, Cambridge, MA 02139
(617) 621-7557 [email protected]
Shivendra Panwar
Polytechnic University
5 Metrotech Center, Brooklyn, NY 11201
(718) 260-3740 [email protected]
Authors:
November 2006
Thanasis Korakis, Polytechnic University
Slide 2
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Abstract
This talk presents a new Cooperative MAC protocol called CoopMAC:
• CoopMAC takes advantage of the multi-rate capability of the current 802.11 standard and assists “slow” stations, improving the performance of the whole network.
• A slow station, instead of sending its packets using a “slow” one hop transmission, uses a “helper”, i.e. a station that is located between the transmitter and the receiver, and sends its packets by using a two “fast” hop transmission.
• CoopMAC can be applied with AND without physical layer cooperation, and achieves significant improvement in both cases.
• A preliminary demo shows that CoopMAC outperforms 802.11 in a real environment.
November 2006
Thanasis Korakis, Polytechnic University
Slide 3
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Motivation for Cooperation
• Wireless link is unreliable (broadcast channel + diversity)• Solution: Use another mobile to relay information• Optional function: The destination can process signals from both mobiles
– Spatial diversity through relay’s antenna
• Results in– Higher reliability, higher data rates, increased battery life, extended coverage
Source
Helper
Destination
November 2006
Thanasis Korakis, Polytechnic University
Slide 4
doc.: IEEE 802.11-06-1642-00-0wng
Submission
STA1STA2
Access point
Motivation for Cooperation• Leverage both the cooperation and multirate capabilities of 802.11 MAC
WithoutCooperation
T1 (STA1 AP)
11Mbps
11Mbps
T2 (STA2 AP)
WithCooperation
T3 (STA1 STA2) T4 (STA2 AP) T5 (STA2 AP)
1Mbps
11Mbps11Mbps
November 2006
Thanasis Korakis, Polytechnic University
Slide 5
doc.: IEEE 802.11-06-1642-00-0wng
Submission
STA1 STA2
Access point
Cooperative MAC (CoopMAC)
Procedure for selecting a helper
• Look up the Cooperation Table
• Find the one that satisfies the following condition
– Time[Direct Tx] > Time[Two-hop Relaying]
• If the information is not stale, use the helper.
Data transmission procedure Handshake
RTS (Ready To Send) HTS (Helper ready To Send) CTS (Clear To Send)
Data transmission Acknowledgement
RTSHTSCTS
DataACK
November 2006
Thanasis Korakis, Polytechnic University
Slide 6
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Performance Improvement• Cooperative MAC significantly improves the network performance
(throughput).
• Simulation settings:– Saturation load, with frame size of 1500 bytes
Network CapacityNetwork Capacity
November 2006
Thanasis Korakis, Polytechnic University
Slide 7
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Performance Improvement• Cooperative MAC significantly improves the network performance
(delay).
• Simulation settings:– Saturation load, with frame size of 1500 bytes
Channel Access DelayChannel Access Delay
November 2006
Thanasis Korakis, Polytechnic University
Slide 8
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Performance Improvement• Cooperative MAC significantly improves the network performance
(energy efficiency).
• Simulation settings:– Saturation load, with frame size of 1500 bytes
Energy EfficiencyEnergy Efficiency
November 2006
Thanasis Korakis, Polytechnic University
Slide 9
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Implementation approach
• Platform
– Based upon HostAP driver on a Linux platform.
• Firmware limitations
– Time sensitive functions (e.g. Ack transmission) are controlled by the firmware.
• Packet format
– A new header is introduced.
IEEE 802.11b PHY
IEEE 802.11 DCF MAC
Intersil Prism chipset
Firmware on the chip
HostAP Driver in Linux kernel
Protocol stackProtocol stack
802.11 PHY Preamble &
Header
Src
Addr
Payload
Cooperation Header
802.11 MAC
Header
Dest
Addr
Helper
Addr
New header formatNew header format
November 2006
Thanasis Korakis, Polytechnic University
Slide 10
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Experimental Throughput Comparison
UDPUDP TCPTCP
• Experiment settings: – 1 source, 1 helper and 1 receiver.– No active traffic from the helper.
• Major finding: Both UDP and TCP traffic enjoy the benefit of CoopMAC
Simulation settings: 1000 bytes payload size
November 2006
Thanasis Korakis, Polytechnic University
Slide 11
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Better to Give than to Receive
UDPUDP
• Experiment settings:
– 1 source, 1 helper and 1 receiver.
– Helper is now active.
• Major finding: Helper enjoys the benefit of Cooperation
November 2006
Thanasis Korakis, Polytechnic University
Slide 12
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Network throughput Major finding: Overall Network throughput is very high in CoopMAC
compared to 802.11
1/1/1 2/2/1 3/3/1 4/4/10
0.5
1
1.5
2
2.5
3
3.5
Number of Stations
To
tal N
etw
ork
Cap
acity
(M
bps
)
CoopMAC802.11
November 2006
Thanasis Korakis, Polytechnic University
Slide 13
doc.: IEEE 802.11-06-1642-00-0wng
Submission
Demo• A full functional video streaming demo shows the benefits of
CoopMAC protocol. – The demo consists of 4 laptops (receiver, transmitter, 2 candidate helpers).
– The helpers provide different transmission rates to the transmitter for the two hop.
– The transmitter dynamically selects the best helper.
– The video quality at the receiver varies, depending on the two hop rates.
November 2006
Thanasis Korakis, Polytechnic University
Slide 14
doc.: IEEE 802.11-06-1642-00-0wng
Submission
November 2006
Thanasis Korakis, Polytechnic University
Slide 15
doc.: IEEE 802.11-06-1642-00-0wng
Submission
ConclusionThe new Cooperative MAC protocol:
– Significantly improves the performance of 802.11.– Can be combined to cooperative schemes on the Physical layer.– It is backward compatible with 802.11.– Can be applied on top of 802.11 as an assisting mechanism.– It is different from mesh networks multi-hop relying. – Easy to implemented by changing the driver and the firmware of the card.
Any help available to further proceed with the implementation of the protocol?
![Detection of Selfish Nodes in Networks Using CoopMAC Protoco[1]](https://static.fdocuments.net/doc/165x107/543ef2b4b1af9f780b8b4bf0/detection-of-selfish-nodes-in-networks-using-coopmac-protoco1.jpg)
