University of California, Irvine
Application data broadcast in ad hoc networks is an important primitive that has received little systematic research - the main focus of prior research being on control data broadcast. In this paper, the authors show why control data broadcast and even multicast techniques are insufficient for reliable application data broadcast; in fact their reliability degrades sharply with increasing application data size. They discover the root cause of this to be IP fragmenting the application data but not providing good reliability control on the fragments. Hence, they propose READ (Reliable and Efficient Application-data Dissemination), a protocol based on higher-layer fragmentation with fragment-level reliability control. READ splits a data packet into fragments, and disseminates them separately at dynamically adaptive intervals.