A pro-active mobility management scheme for pub/sub systems using neighborhood graph

This paper presents a novel and efficient mobility management scheme based on a pro-active caching approach (i.e., state transfer/caching occurs prior to the subscriber's movement) to extend existing pub/sub systems to the mobile, wireless domain. This approach depends largely on a mechanism that intelligently pre-loads subscriber contexts one hop ahead of its current broker. To achieve this in an automated fashion, we introduce the notion of a neighbor graph, which is built automatically, to capture user mobility patterns. We have investigated the effectiveness of our proposed approach through testbed experiments, comparing it to the current state-of-the-art solutions, durable subscription-based and reactive, proposed in the literature. The experimental results across a broad-rang