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The volume of Internet traffic over 3G wireless networks is sharply rising. In contrast to many Internet services utilizing replicated resources, such as Content Distribution Networks (CDN), the current 3G standard architecture employs hierarchical routing, where all user data traffic goes through a small number of aggregation points using logical tunnels. In this paper, the authors study the performance implications of the interplay when 3G users access Internet services. They first identify a number of scenarios in which 3G users' service performance can be affected under hierarchical routing in comparison to an idealized flat routing. They then quantify this service impact by analyzing trace data obtained from a large-scale 3G network and a CDN provider.
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