1. Energy-efficient Wireless 802.11 MAC Protocol CS 603 - Wireless Communications & Networks Summer II 2003 Dr. Ajay Gupta Serhat Kucukomeroglu & Weng Liong Low

2. 2 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003  The IEEE 802.11 MAC protocol based on CSMA/CA 1)Physical carrier sense (sender) 2)virtual carrier sense (receiver) - Request to Sent (RTS) - Clear to Sent (CTS)  The 802.11 MAC protocol uses two ways to coordinate channel access. - Distributed Coordination Function (DCF) - Point Coordination Function (PCF).

3. 3 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 Power saving mechanism in the Distributed Coordination Function  A wireless interface can in - off state - doze state - awake state (transmit, receive, idle)

4. 4 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 Distributed Coordination Function

5. 5 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 Dynamic Power Saving Mechanism (DPSM)

6. 6 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 Dynamic Power Saving Mechanism (DPSM)

7. 7 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 Future works  Adding error corrections codes.  Using “master nodes” in DCF mode.

8. 8 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 References  [1] Jung & Vaidya, An Energy Efficient MAC Protocol for Wireless LANs (2001). http://citeseer.nj.nec.com/541068.html http://citeseer.nj.nec.com/541068.html  [2] Jung & Vaidya, A Power Saving MAC Protocol for Wireless Networks (2002). http://citeseer.nj.nec.com/551865.html http://citeseer.nj.nec.com/551865.html  [3] Zheng & Kravets, On-demand Power Management for Ad Hoc Networks (2002). http://citeseer.nj.nec.com/zheng02demand.html http://citeseer.nj.nec.com/zheng02demand.html  [4] Singh & Raghavendra, PAMAS Power Aware Multi-Access protocol with Signaling for Ad Hoc Networks (1999). http://citeseer.nj.nec.com/singh99pamas.htmlhttp://citeseer.nj.nec.com/singh99pamas.html  [5] Sharma, Analysis of 802.11b MAC: A QoS, Fairness, and Performance Perspective (2003). http://citeseer.nj.nec.com/sharma03analysis.htmlhttp://citeseer.nj.nec.com/sharma03analysis.html  [6] Holland et al, A Rate-Adaptive MAC Protocol for Multi-Hop Wireless Networks (2001). http://citeseer.nj.nec.com/446806.html http://citeseer.nj.nec.com/446806.html  [7] Stine & de Veciana, Tactical Communications Using the IEEE 802.11 MAC Protocol (1998). http://www.argreenhouse.com/society/TacCom/papers98/17_04i.pdfhttp://www.argreenhouse.com/society/TacCom/papers98/17_04i.pdf  [8] Tseng et al., Power-Saving Protocols for IEEE 802.11-Based Multi-Hop Ad Hoc Networks (2002). http://citeseer.nj.nec.com/509561.htmlhttp://citeseer.nj.nec.com/509561.html  [9] Qiao et al., Energy-Efficient PCF Operation of IEEE 802.11a Wireless LAN (2002). http://citeseer.nj.nec.com/qiao02energyefficient.html http://citeseer.nj.nec.com/qiao02energyefficient.html

9. 9 Energy-efficient Wireless 802.11 MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 Questions