Performance Modeling of Delayed Offloading in Mobile Wireless Environments With Failures
Huaming Wu · IEEE Communications Letters · 2018
Mobile devices and wireless network links are sometimes unreliable and unstable owing to user mobility in mobile wireless environments. As a result, failures may occur during the offloading process, which has a huge influence on the offloading performance. Worse still, it is challenging to make high-level offloading decisions since they closely rely on an accurate predicting model, especially when encountering with offloading failures. Unfortunately, due to the high mobility and heterogeneous network environments, such a model is currently not available to researchers and practitioners. To fill that gap, this letter develops an analytical queueing model for delayed offloading systems with intermittent connectivity. We set a deadline to detect offloading failures when taking the impatient jobs and service interruptions into account. Furthermore, for different types of mobile applications, a tradeoff analysis between energy saving and latency reducing is analyzed on the basis of an energy-response time weighted product metric. The proposed offloading model can be effectively used for describing complex and realistic offloading systems with the presence of failures.