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• W2227993923 abstract "Wireless multihop networks of various forms—such as ad hoc, mesh or RFID networks—are getting popular as a means of creating a pervasive wireless networking mechanism. The central concept in such networks is use of multihop relaying. Multihop wireless links give rise to new challenges in medium access control (MAC) protocols. The challenges include interference, fading, improving network throughput and guaranteeing fairness. We have used various cross layer design techniques to combat these challenges. In our first work, we develop a cross-layer solution called MAC-layer anycast that combats link loss due to interference or fading by exploiting path diversity available from the routing layer. We develop an 802.11-like protocol to implement anycast. We show via both simulations and testbed experiments that it is superior to 802.11-like protocols. We also show that anycast is very useful when used in conjunction with directional antenna or multiple channels, as well as for improving reliability and efficiency of MAC-layer multicast. In our second work, we have demonstrated the benefits of using the physical layer signal level information to improve the accuracy of scheduling algorithms. To this end, we use the TelosB motes platform to model the relationship between the packet capture probability and SINR based on measurements. We show how this model can be used to develop a realistic interference model for a given testbed using only O(n) measurements on the testbed. We provide validation results for the accuracy of this approach for predicting whether a set of links are schedulable concurrently. In our third work, we develop protocols for provisioning max-min fair bandwidth for multihop flows. Here, we develop a two-part solution that combines queueing/scheduling and MAC protocol for guaranteeing max-min fairness for multihop flows. Finally, we focus our attention to RFID networks where new forms of interference are possible due to presence of two different entities, RFID tags and readers. We demonstrate via a testbed how interferences can be resolved in a RFID networks via simple carrier-sensing mechanism that can be implemented using commodity hardware." @default.
• W2227993923 created "2016-06-24" @default.
• W2227993923 creator A5053458937 @default.
• W2227993923 date "2007-01-01" @default.
• W2227993923 modified "2023-09-22" @default.
• W2227993923 title "Efficient medium access protocols for wireless and rfid networks" @default.
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• W2227993923 hasPublicationYear "2007" @default.
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