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— We describe enhancements to the IEEE 802.11 DCF MAC Protocol which enable nodes to identify themselves as exposed nodes and to opportunistically schedule concurrent transmissions whenever possible, thereby improving utilization and mitigating the exposed node problem. The algorithm makes minimal changes to the IEEE 802.11 MAC protocol. It does not require(More)
Seamless mobility across heterogeneous mobile wireless technologies is now essential as mobile subscribers demand full and cost-effective wireless network coverage. Under such mobility conditions the layered protocol stack is inefficient. Significant research has been done for cross layer optimizations of the protocol stack. To enable rapid deployment of(More)
— The needs of Indian rural telecom, and the economics of currently available broadband access technologies , motivate a new system for rural broadband access, which we call WiFiRe (WiFi Rural Extension). The system leverages the widely available, and highly cost-reduced, WiFi chipsets. We, however, retain only the PHY from these chipsets and propose a(More)
Think-Pair-Share (TPS) is a classroom-based active learning strategy, in which students work on a problem posed by the instructor, first individually, then in pairs, and finally as a class-wide discussion. TPS has been recommended for its benefits of allowing students to express their reasoning, reflect on their thinking, and obtain immediate feedback on(More)
Radio Frequency Identification (RFID) finds use in numerous applications involving item identification and tracking. In a typical application, RFID tags are attached to the items and are periodically queried by readers. Using a fixed placement of readers to guarantee complete coverage of all tags in a given area at all times increases the deployment costs.(More)
— Applications using traditional protocol stacks (e.g TCP/IP) from wired networks do not function ef£ciently in mobile wireless scenarios. This is primarily due to the layered architecture and implementation of protocol stacks. Cross layer feedback is one of the mechanisms to improve the performance of a layered stack, in mobile wireless environments. For(More)
ii Declaration I declare that this written submission represents my ideas in my own words and where other's ideas or words have been included, I have adequately cited and referenced the original sources. I also declare that I have adhered to all principles of academic honesty and integrity and have not misrepresented or fabricated or falsified any(More)
The performance of applications on mobile devices is affected by the device constraints of memory, processing power, battery life and the variations in the wireless network. The variations in the wireless network will be compounded in the next generation networks—3G and beyond—when the devices move across heterogeneous networks. To allow interoperability(More)