High Performance Publish/Subscribe Middleware for Mobile Wireless Networks

Abstract

Decoupling, flexible, scalable and asynchronous nature of publish/subscribe paradigms makes them a good choice for mobile wireless networks. However, our research shows that current implementations of publish/subscribe systems as well as the traditional solutions for extending publish/subscribe systems to the mobile domain do not perform well in highly mobile and unreliable wireless settings. We present semi-durable subscriptions, a technique that we have developed to overcome the challenges and the performance concerns publish/subscribe systems face in mobile wireless settings. We discuss the architecture of semi-durable subscriptions and study in detail the effect of various mobility parameters on the performance of semi-durable subscriptions to demonstrate their efficacy in mobile wireless settings. We also discuss system parameters for semi-durable subscriptions and with the help of experimental results demonstrate how these parameters can be controlled to configure a system according to a set of desired characteristics.

A Protocol for Content-Based Communication in Disconnected Mobile Ad Hoc Networks

“…In contrast in content-based communication the sender does not necessarily know who the recipients of its message are, or even if they exist at all. Several papers about content-based communication have already been published, but the algorithms and protocols they define can only be used in stable, wired networks, or in fully connected MANETs [9,13,21,25]. These papers usually propose to construct and maintain content-based routing structures in order to forward messages efficiently between publishers and subscribers.…”

RLAM: A Dynamic and Efficient Reinforcement Learning-Based Adaptive Mapping Scheme in Mobile WiMAX Networks

“…The BS is responsible for accommodating all MSs' requests to both uplink and downlink sub-frames. For the downlink sub-frame, the BS decision is based on the needs and characteristics of the incoming traffic, while, for the uplink sub-frame, allocations are based on requests originating from the MSs, involving several mechanisms and polling schemes [7]. The network elements that accomplish this task are the scheduler and the mapper.…”

A pro-active mobility management scheme for publish/subscribe middleware systems

“…The implementation of the reactive mobility support is similar to the ones described in the literature [10] [32] [35] and shares as much code and data structures as possible with the pro-active mobility support. This provides us with a fair comparison and baseline indicator to evaluate the adequacy of our proposed approach.…”

“…In contrast, almost 60% of the handoffs take less than . 35 and .05 seconds with the pro-active and durable-based approaches, respectively. The observed results confirm that the pro-active and durable-based approaches can provide fast handoffs since the subscriber context is always ready at its new broker prior to its movement, but respectively require mobility prediction and large buffer space.…”