Analysis of adaptive bandwidth allocation in wireless networks with multilevel degradable quality of service

Abstract

Abstract-A wireless/mobile network supporting multilevel Quality of Service (QoS) is considered. In such a network, users or applications can tolerate a certain degree of QoS degradation. Bandwidth allocation to users can, therefore, be adjusted dynamically according to the underlying network condition so as to increase bandwidth utilization and service provider's revenue. However, arbitrary QoS degradation may be unsatisfactory or unacceptable to the users, hence resulting in their subsequent defection. Instead of only focusing on bandwidth utilization or blocking/dropping probability, two new user-perceived QoS metrics, degradation ratio and upgrade/degrade frequency, are proposed. A Markov model is then provided to derive these QoS metrics. Using this model, we evaluate the effects of adaptive bandwidth allocation on user-perceived QoS and show the existence of trade offs between system performance and user-perceived QoS. We also show how to exploit adaptive bandwidth allocation to increase system utilization (for the system administrator) with controlled QoS degradation (for the users). By considering various mobility patterns, the simulation results are shown to match our analytical results, demonstrating the applicability of our analytical model to more general cases.

Managing end‐to‐end quality of service in multiple heterogeneous wireless networks

“…Many schemes for bandwidth estimation have been suggested [17]. The effect of system degradation in wireless networks has been studied with respect to QoS, and two new user-perceived QoS metrics-degradation ratio and upgrade/degrade frequency-have been proposed [18]. Algorithms for updating web pages in mobile devices during disconnections from the web server have been proposed [19].…”