蜂巢式系統之多變率即時服務與可暫停非即時服務的連線允入控制

多元服務蜂窩系統使用者的觀點來看，“撥打電話被阻隔”與“通話中斷”都是非常令人困擾的。先前研究指出連線允入控制(CAC)政策為了減少“通話中斷”的機率，是以增加“撥打電話被阻隔”的機率作為代價。為了同時減少“撥打電話被阻隔”機率與“通話中斷”機率，本論文採用適應性多變率(AMR)方案，AMR是知名的即時串流編碼技術。AMR的通話服務可以改善使用者滿意度與保證不同多媒體連線級別的服務品質。按照不同的動態流量負載，來及時調整頻寬配置。令人失望的CAC政策可導致低頻寬利用率。在不改變“撥打電話被阻隔”與“通話中斷”機率下，針對動態頻寬配置與增加頻寬利用率問題，本論文提出與評估新的“非即時服務暫停的虛擬分割”CAC方案，來解決“搶占的虛擬分割”CAC方案所造成的問題。合適的“非即時服務暫停的虛擬分割”規則，已對即時與非即時連線作定義。對每種使用者換手的連線允入控制(CAC)優先權是不同的。在低負載即時(RT)群組未使用的容量，假如必要時，可以被非即時(NRT)連線使用。即時(RT)連線取得保證存取與更好的服務品質，因為當非即時(NRT)群組過載時，即時(RT)連線可以暫停非即時(NRT)連線。成果呈現出蜂窩系統，在“撥打電話被阻隔”與“通話中斷”機率方面的表現。在非即時(NRT)服務被暫停下，數值分析結果呈現出顯著的改善。

關鍵字

即時通話服務；非即時服務暫停的虛擬分割； “撥打電話被阻隔”的機率與“通話中斷”的機率；適應性多變率(AMR) ；連線允入控制(CAC) ；服務品質

並列摘要

The blocking and dropping of calls are annoying from the viewpoints of multiservice cellular system users. Previous studies have shown that a connection admission control (CAC) policy reduces dropping probability to a much lower level at the cost of raising blocking probability to a higher level. To reduce both blocking and dropping probabilities, this dissertation uses Adaptive Multi-Rate (AMR) scheme, which is a well-known real-time streaming coding technique. AMR services can improve the degree of user satisfaction and guarantee the connection-level QoS for different multimedia. Adjusting promptly bandwidth allocation according to the dynamics of traffic load is difficult. Disappointing CAC policies can lead to low bandwidth utilization. For the problems of dynamic bandwidth allocation and increasing bandwidth utilization under invariable blocking and dropping probabilities, this dissertation proposes and evaluates new “CAC schemes of the Virtual Partitioning (VP) with non-real-time (NRT) service pause” that solve the problems caused by the VP with preemption. The suitable VP with NRT service pause rules have been defined for the RT and NRT connections. The priorities of CAC to each type of handoff users are different. The unused capacity in the under-loaded RT group can be utilized by the NRT connections if necessary. The RT connections receive guaranteed access and better QoS, because the RT connection can pause the NRT connection when the NRT group is overloaded. Results show the performance of the cellular system in terms of the blocking and dropping probabilities. The numerical results show significant performance improvement under the NRT service paused.

並列關鍵字

Real-Time (RT) Service ； Virtual Partitioning (VP) with non-real-time (NRT) Service Pause ； Adaptive Multi-Rate (AMR) ； Blocking and Dropping Probabilities ； Connection Admission Control (CAC) ； Quality of Service (QoS)

參考文獻

[1] Lei Huang, Sunil Kumar, and C.-C. Jay Kuo, “Adaptive Resource Allocation for Multimedia Services in Wireless Communication Networks,” International Conference on Distributed Computing Systems Workshop, pp. 307-312, Mesa, AZ, USA, Apr. 2001.

[2] Dimitrios G. Stratogiannis, Georgios I. Tsiropoulos, John D. Kanellopoulos, and Panayotis G. Cottis, “Probabilistic Call Admission Control in Wireless Multiservice Networks,” IEEE Communications Letters, vol. 13, no. 10, pp. 746-748, Oct. 2009.

[3] Yuguang Fang and Yi Zhang, “Call Admission Control Schemes and Performance Analysis in Wireless Mobile Networks,” IEEE Transactions on Vehicular Technology, vol. 51, no. 2, pp. 371-382, Mar. 2002.

[4] Shensheng Tang and Wei Li, “Performance Analysis of the 3G Network with Complementary WLANs,” IEEE Global Telecommunications Conference, pp. 2637-2641, St. Louis, MO, Dec. 2005.

[6] Chi-Chao Chao and Wai Chen, “Connection Admission Control for Mobile Multiple-Class Personal Communications Networks,” IEEE Journal on Selected Areas in Communications, vol. 15, no. 8, pp. 1618-1626, Oct. 1997.

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蜂巢式系統之多變率即時服務與可暫停非即時服務的連線允入控制

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