A quality of service negotiation-based vertical handoff decision scheme in heterogeneous wireless systems
A quality of service negotiation-based vertical handoff decision scheme in heterogeneous wireless systems
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DOI：
10.1016/j.ejor.2007.07.011
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发表时间：
2008-12-16
影响因子：
6.4
通讯作者：
Jamalipour, Abbas
中科院分区：
文献类型：
--
作者：
Song, Qingyang;Jamalipour, Abbas
提出了一种新的垂直切换决策方案。其目标是为用户提供增强的服务质量（QoS）并最大化网络收益。该方案通过适当定义的网络价值函数和用户-运营商协商模型来平衡双方利益。优点函数根据用户偏好评估网络性能，并决定最适合用户的网络。将协商模型定义为半马尔可夫决策过程（SMDP）。通过使用Q-learning解决SMDP问题，找到了在不违反QoS约束的情况下使网络收益最大化的最优策略。此外，为了降低终端接口激活时的功耗，将自适应QoS监控机制与优点函数相结合。仿真结果表明，所提出的垂直切换决策方案在功耗、切换掉话概率（HCDP）和网络收益等方面都提高了性能。(C) 2007 Elsevier B.V.版权所有
This paper introduces a novel vertical handoff decision scheme. The objective is to provide users with enhanced quality of service (QoS) and maximize the network revenue. This scheme balances both-side interests via a suitably defined network merit function and a user-operator negotiation model. The merit function evaluates network performance based on user preferences and decides the most appropriate network for users. The negotiation model is defined as a semi-Markov decision process (SMDP). An optimal policy that maximizes the network revenue without violating QoS constraints is found by resolving the SMDP problem using Q-learning. Furthermore, a time-adaptive QoS monitoring mechanism is combined with the merit function in order to decrease the power consumption on terminal interface activation. The simulation results demonstrate that the proposed vertical handoff decision scheme enhances the performance in terms of power consumption, handoff call-dropping probability (HCDP) and network revenue. (C) 2007 Elsevier B.V. All rights reserved.