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

2 Energy-efficient Wireless MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003  The IEEE 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 MAC protocol uses two ways to coordinate channel access. - Distributed Coordination Function (DCF) - Point Coordination Function (PCF).

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

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

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

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

8 Energy-efficient Wireless MAC Protocol Weng Liong Low & Serhat Kucukomeroglu CS603 – SummerII 2003 References  [1] Jung & Vaidya, An Energy Efficient MAC Protocol for Wireless LANs (2001).  [2] Jung & Vaidya, A Power Saving MAC Protocol for Wireless Networks (2002).  [3] Zheng & Kravets, On-demand Power Management for Ad Hoc Networks (2002).  [4] Singh & Raghavendra, PAMAS Power Aware Multi-Access protocol with Signaling for Ad Hoc Networks (1999).  [5] Sharma, Analysis of b MAC: A QoS, Fairness, and Performance Perspective (2003).  [6] Holland et al, A Rate-Adaptive MAC Protocol for Multi-Hop Wireless Networks (2001).  [7] Stine & de Veciana, Tactical Communications Using the IEEE MAC Protocol (1998).  [8] Tseng et al., Power-Saving Protocols for IEEE Based Multi-Hop Ad Hoc Networks (2002).  [9] Qiao et al., Energy-Efficient PCF Operation of IEEE a Wireless LAN (2002).

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