An MDP-based vertical handoff decision algorithm for heterogeneous wireless networks
An MDP-based vertical handoff decision algorithm for heterogeneous wireless networks
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DOI：
10.1109/tvt.2007.907072
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发表时间：
2008-03-01
影响因子：
6.8
通讯作者：
Wong, Vincent W. S.
中科院分区：
文献类型：
--
作者：
Stevens-Navarro, Enrique;Lin, Yuxia;Wong, Vincent W. S.
超第三代(B3G)或第四代(4G)无线网络的体系结构旨在整合各种不同类型的无线接入网络。设计的主要问题之一是对垂直切换的支持。当移动终端从一个网络切换到另一个网络(例如，从无线局域网切换到码分多址1x无线电传输技术)时，发生垂直切换。本文的目的是确定垂直切换应该在什么条件下执行。该问题被描述为一个马尔可夫决策过程，目标是最大化每个连接的总期望回报。由连接使用的网络资源由链接奖励功能捕获。信令成本被用来对执行垂直切换时在网络上产生的信令和处理负载进行建模。数值迭代算法用于计算平稳的确定性策略。对于性能评估，考虑了语音和数据应用程序。数值结果表明，该方案的性能优于其他垂直切换决策算法，即简单加性加权算法、理想解相似排序技术和灰色关联分析算法。
The architecture for the Beyond 3rd Generation (B3G) or 4th Generation (4G) wireless networks aims at integrating various heterogeneous wireless access networks. One of the major design issues is the support of vertical handoff. Vertical handoff occurs when a mobile terminal switches from one network to another (e.g., from wireless local area network to code-division multiple-access 1x radio transmission technology). The objective of this paper is to determine the conditions under which vertical handoff should be performed. The problem is formulated as a Markov decision process with the objective of maximizing the total expected reward per connection. The network resources that are utilized by the connection are captured by a link reward function. A signaling cost is used to model the signaling and processing load incurred on the network when vertical handoff is performed. The value iteration algorithm is used to compute a stationary deterministic policy. For performance evaluation, voice and data applications are considered. The numerical results show that our proposed scheme performs better than other vertical handoff decision algorithms, namely, simple additive weighting, the technique for order preference by similarity to ideal solution, and Grey relational analysis.