A Selective Neighbor Caching Approach for Supporting Mobility in Publish/Subscribe Networks

We present a selective neighbor caching approach for supporting mobility in publish/subscribe networks. According to the approach, a mobile’s subscriptions are transmitted to a subset of brokers that are neighbors of the current broker that the mobile is connected to. Our key contribution is the definition of a target cost function and an intelligent procedure for selecting the subset of neighbors. The advantage of our proposal is that it reduces the buffering costs, since not all neighbor brokers cache items, while still obtaining the gains of proactive caching, by caching items in a subset of neighbor brokers that a mobile has a high probability to connect to.