document: Low-infrastructure methods to improve internet access for mobile users in emerging regions As information technology supports more aspects of modern life , digital access has become an important tool for developing regions to lift themselves from poverty . Though broadband internet connectivity will not be universally available in the short-term , widely-employed mobile devices coupled with novel delay-tolerant networking do allow limited forms of connectivity . This paper explores the design space for internet access systems operating with constrained connectivity . Our starting point is C-LINK , a collaborative caching system that enhances the performance of interactive web access over DTN and cellular connectivity . We discuss our experiences and results from deploying C-LINK in Nicaragua , before moving on to a broader design study of other issues that further influence operation . We consider the impact of ( i ) storing web content collaboratively cached across all user nodes , ( ii ) hybrid transport layers exploiting the best attributes of limited cellular and DTN-style connectivity . We also explore the behavior of future systems under a range of usage and mobility scenarios . Even under adverse conditions , our techniques can improve average service latency for page requests by a factor of 2X . Our results point to the considerable power of leveraging user mobility and collaboration in providing very-low-infrastructure internet access to developing regions .
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