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In today's Internet, mobile devices are connected to multiple accessnetworks, e.g., WiFi/DSL and LTE. To take advantage of the networks' diversepaths characteristics (delay, bandwidth, and reliability) and aggregatebandwidth, we need smart strategies for choosing which interface(s) to use forwhat traffic. In this paper, we present an approach how to tackle thischallenge as part of the Operating System (OS): With the concept of SocketIntents, applications can express what they know about their communicationpattern and their preferences. Using our Socket Intents Prototype and ourmodified BSD Socket Interface, this information is used to choose the mostappropriate path or path combination on a per message or per connection basis.We evaluate our system based on the use case of Web browsing: Using ourprototype and a client-side proxy, we show the feasibility and benefits of ourdesign. Using a flow-based simulator and a full factorial experimental design,we study a broad range of access network combinations (based on typical DSL andLTE scenarios) and real workloads (Alexa Top 100 and Top 1000 Web Sites). Ourpolicies achieve performance benefits in more than 50% of the cases andspeedups of more than factor two in 20% of the cases without adding overhead inthe other cases.

Socket Intents: OS Support for Using Multiple Access Networks and its Benefits for Web Browsing