Mobile devices dominate the Internet today, however the Internet rooted in its tethered origins continues to provide poor infrastructure support for mobility. Our position is that in order to address this problem, a key challenge that must be addressed is the design of a massively scalable global name service that rapidly resolves identities to network locations under high mobility. Our primary contribution is the design, implementation, and evaluation of Auspice, a nextgeneration global name service that addresses this challenge. A key insight underlying Auspice is a demand-aware replica placement engine that intelligently replicates name records to provide low lookup latency, low update cost, and high availability. We have implemented a prototype of Auspice and compared it against several commercial managed DNS providers as well as state-of-the-art research alternatives, and shown that Auspice significantly outperforms both. We demonstrate proof-of-concept that Auspice can serve as a complete end-to-end mobility solution as well as enable novel context-based communication primitives that generalize nameor address-based communication in today's Internet.
We present BlockRate, a wireless bitrate adaptation algorithm designed for blocks, or large contiguous units of transmitted data, as opposed to small packets. In contrast to state-of-the-art algorithms that can either have the amortization benefits of blocks or high responsiveness to underlying channel conditions of packets, BlockRate has both. Our evaluation shows that BlockRate achieves up to 2.8× goodput improvement in a variety of mobility scenarios.
Our work is motivated by a simple question: can we design a simple routing protocol that ensures robust performance across networks with diverse connectivity characteristics such as meshes, MANETs, and DTNs? We identify packet replication as a key structural difference between protocols designed for opposite ends of the connectivity spectrum-DTNs and meshes. We develop a model to quantify under what conditions and by how much replication improves packet delays, and use these insights to drive the design of R3, a routing protocol that self-adapts replication to the extent of uncertainty in network path delays. We implement and deploy R3 on a mesh testbed and a DTN testbed. To the best of our knowledge, R3 is the first routing protocol to be deployed and evaluated on both a DTN testbed and a mesh testbed. We evaluate its performance through deployment, trace-driven simulations, and emulation experiments. Our results show that R3 achieves significantly better delay and goodput over existing protocols in a variety of network connectivity and load conditions.
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