1. 1 15-441 Computer Networking Lecture 6 – MAC

2. 2 Readings [E.2] V. Bharghavan, A. Demers, S. Shenker, and L. Zhang. MACAW: A Media Access Protocol for Wireless LANs, In Proc. ACM SIGCOMM, London, U.K., September 1994, pp. 212-225. [E.8] Kyle Jamieson, Bret Hull, Allen K. Miu, Hari Balakrishnan. Understanding the Real-World Performance of Carrier Sense. ACM SIGCOMM Workshop on Experimental Approaches to Wireless Network Design and Analysis (E-WIND)Understanding the Real-World Performance of Carrier Sense [E.5] Martin Heusse, Franck Rousseau, Romaric Guillier, and Andrzej Duda. Idle Sense: An Optimal Access Method for High Throughput and Fairness in Rate Diverse Wireless LANs In Proc. of ACM SIGCOMM, Aug. 2005Idle Sense: An Optimal Access Method for High Throughput and Fairness in Rate Diverse Wireless LANs

3. 3 Optional [E.1] Phil Karn, "MACA - A New Channel Access Method for Packet Radio", 1990.MACA - A New Channel Access Method for Packet Radio The classic work – basically throw out carrier sense and use RTS/CTS to provide collision avoidance MACA == Media Access (?) Collision Avoidance [E.3] B. Sadeghi, V. Kanodia, A. Sabharwal, and E. Knightly, Opportunistic Media Access for Multirate Ad Hoc Networks, in Proceedings of ACM MOBICOM 2002Opportunistic Media Access for Multirate Ad Hoc Networks Points out that rate adaptation is critical part of 802.11 and accounts for it in MAC Basically gives each node time opportunity equal to transmission at base rate [E.6] A. Vasan, R. Ramjee, and T. Woo. Echos - Enhanced Capacity 802.11 Hotspots In Proc. of IEEE Infocom'05, Mar 2005Echos - Enhanced Capacity 802.11 Hotspots Adjusts carrier sense threshold to allow for simultaneous transmissions by nearby APs Allow an AP to use multiple channels based on loads [E.7] F. Talucci, M. Gerla, and L. Fratta. MACA-BI (MACA by invitation) a receiver oriented access protocol for wireless multihop networks. In Proceedings of IEEE PIMRC, 1997.MACA-BI (MACA by invitation) a receiver oriented access protocol for wireless multihop networks A receiver oriented MAC – eliminates overhead of RTS transmission but requires predictable traffic