一種新的分布式QoS控制動(dòng)態(tài)資源調(diào)配算法
A New Dynamic Resource Allocation Algorithm for Distributed QoS Control
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摘要: 該文提出了一種新的分布式環(huán)境下用于QoS控制的基于模糊邏輯的動(dòng)態(tài)資源調(diào)配(Fuzzy logic based Dynamic Resource Allocation，F(xiàn)DRA)算法。分布式環(huán)境采用集中式帶寬代理(Bandwidth Brokers, BB))與分布式BB相結(jié)合的控制模式。分布式BB基于滑動(dòng)窗口和滑動(dòng)指針機(jī)制，在分配資源不足時(shí)向集中式BB請(qǐng)求追加資源，在占用資源高于需求一定閾值時(shí)滯后釋放部分追加資源。追加資源塊和釋放資源塊的大小分別由集中式BB和分布式BB根據(jù)當(dāng)前網(wǎng)絡(luò)負(fù)荷狀態(tài)，采用模糊邏輯確定。模糊邏輯算法引入新的基于數(shù)據(jù)源特性的隸屬度函數(shù)生成方法，提高決策的有效性。仿真結(jié)果證明，該文提出的算法性能優(yōu)于已有文獻(xiàn)的算法。Abstract: A new Fuzzy-logic based Dynamic Resource Allocation algorithm (FDRA) used for QoS control is proposed in this paper. In the hierarchically distributed architecture with multiple Bandwidth Brokers (BB), using sliding window and sliding pointer based mechanism, when the allocated resource is in short, a request is issued by the distributed BB to the centralized BB for additional resource. When the resource kept by a distributed BB is over the actual need to some extent, some allocated resource will be released with hysteresis. The size of additional allocated resource and released resource is determined by the centralized BB and the distributed BB respectively. The determination is concluded with a fuzzy logic algorithm taking into account of the current network load status. In order to improve the effectiveness of the decision, a new method of fuzzy mapping function generation is proposed, which is based on the statistical characteristics of the data sources. Simulation results show that the proposed algorithm is superior to the existing ones.
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