標題: 感知雲端網路中具服務品質的資源分配
Resource Allocation with QoS Support in Cognitive Radio Cloud Network
作者: 梁喬峰
Liang, Chiau-Feng
趙禧綠
Chao, Hsi-Liu
資訊科學與工程研究所
關鍵字: 資源分配;時間區塊;感知無線電;效能函式;雲端網路;Resource allocation;Timeslots;Cognitive Radio;Utility function;Cloud network
公開日期: 2012
摘要: 近年來,在感知無線電網路(cognitive radio network)中的資源分配持續受到高度關注。在之前的論文中,我們設計了一個運作在電視空白頻譜(TV white space)上的感知無線電雲端網路。為了有效利用電視空白頻譜的資源,我們提出了一個適用於我們系統上的資源管理架構。我們的資源管理架構主要分成三個部分,包括在雲端上的分群及資源管理、在雲端上的功率控制及資源分配、以及在感知無線電存取點上的資源管理。這篇論文中,我們集中在第三部分。具體來說,我們將使用者分成幾個群組、定義一些服務類別、並將使用者的需求轉換成所需頻道數。再雲端完成資源管理前兩層的資源分配及功率控制後,我們設計的演算法將進一步以時間區塊為單位分配資源給感知無線電使用者,並最大化系統的效能。 為了有效率地解決這個問題,我們提出了一個貪婪搜尋演算法,且這個演算化找出的解幾乎近似於最佳解。除此之外,我們提出了優先權參數來達到相同服務類別之使用者之間的公平性。最後,從模擬結果中可以看出,不論在效能上,或是同服務類別的使用者之間的公平性,我們提出的演算法都能產生出色的成果。
Resource allocation in cognitive radio (CR) networks is highly concerned in recent years. We have designed cognitive radio cloud network (CRCN) in TV white space in previous works. To effectively use the resource, we proposed a resource management scheme for our CRCN. Our resource management scheme is separated to three parts, clustering and resource management in Cloud, power control and channel allocation in Cloud, and resource management in CR access points (CRAPs). This paper focuses on the third part. Specifically, we first allocate users to several groups, define several service classes, and map users’ requests to the numbers of required channels. After the first two-tiers channel allocation and power control mechanisms performed at the Cloud, the designed scheduling algorithm further allocates resources (in terms of time slots) to CR users to maximize the sum of throughout utilities. To solve the problem efficiently, we proposed a greedy search algorithm, and the scheduling results are almost close to optimal solutions. In addition, we proposed a priority factor to achieve the inner-class fairness even upon low channel availability. Finally, the simulation results show that no matter in throughput or inner-class fairness, our proposed algorithms can yield excellent results.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079955505
http://hdl.handle.net/11536/50425
Appears in Collections:Thesis


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