Analysis of adaptive bandwidth allocation in wireless networks with multilevel degradable quality of service
Analysis of adaptive bandwidth allocation in wireless networks with multilevel degradable quality of service
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DOI：
10.1109/tmc.2004.1261813
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发表时间：
2004-01-01
影响因子：
7.9
通讯作者：
Shin, KG
中科院分区：
文献类型：
--
作者：
Chou, CT;Shin, KG
考虑一种支持多级服务质量(Qos)的无线/移动网络。在这样的网络中，用户或应用可以容忍一定程度的服务质量下降。因此，可以根据底层网络情况动态调整为用户分配的带宽，从而提高带宽利用率和服务提供商的收入。然而，用户可能不满意或不能接受任意的服务质量降级，从而导致他们随后的叛逃。不再只关注带宽利用率或阻塞/丢弃概率，而是提出了两个新的用户感知的Qos度量：降级率和升级/降级频率。然后提供马尔可夫模型来导出这些服务质量度量。利用该模型，我们评估了自适应带宽分配对用户感知的服务质量的影响，并证明了系统性能和用户感知的服务质量之间存在权衡。我们还展示了如何利用自适应带宽分配来增加系统利用率(对于系统管理员)，同时控制(对于用户)服务质量降级。通过考虑不同的迁移率模式，仿真结果与我们的分析结果相吻合，证明了我们的分析模型对更一般情况的适用性。
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..