在多媒體行動網路上具有適應性頻寬降級之動態保護通道配置方法

DYNAMIC GUARD CHANNEL ALLOCATION SCHEME WITH ADAPTIVE BANDWIDTH DEGRADATION IN MULTIMEDIA MOBILE NETWORKS

張國瑩(Kuo-Ying Chang)

指導教授 ： 陳建華

大同大學/電機資訊學院/通訊工程研究所/碩士(2006年)

摘要

在這數十年當中，行動通訊的引進與成功徹底的改變了人們在通訊上的生活方式。而且，行動通訊的成功更是吸引了許多人對他的研究及發展演進。
　　隨著在無線行動通訊網路的CDMA技術引進，行動通訊業者已經能提供最高2 Mbps的通訊環境，並且支援各種的多媒體應用。然而，由於無線通訊的遞交(handoff)特性以及各種多媒體應用的頻寬需求使得網路的設計與發展更為錯綜複雜。因此，如何使行動通訊網路以有效且實際的管理提供支援服務品質(QoS)的通訊方式成為一個有挑戰性的工作。
　　在本論文中，我們研究學習了數個有關於在無線通訊網路的允話控制(CAC)及頻寬分配方法，而且我們也提出以動態保護通道方法(dynamic guard channel scheme)為基礎，並且允許網路依照話務型態對連線的頻寬降級的頻寬分配方式。此外，與固定的保護通道方法(fixed guard channel scheme)和無頻寬降級的動態保護通道方法(dynamic guard channel scheme without bandwidth degradation)經由各項的模擬與相互比較後，我們所提出的方法可在通話阻塞率(call blocking rate)、通話斷話率(call dropping rate) 、網路服務品質(grade of service)以及頻寬使用率(bandwidth utilization)各方面獲得相對較佳的表現。

關鍵字

允話控制 ； 動態保護通道

並列摘要

In the recent decades, the introduction and success of mobile communications highly change people’s life worldwide in communications. Further, the success of mobile communications also attracts a number of researches and developments on it.
With the introduction of CDMA technology in wireless mobile network, the mobile carrier can provide up to 2 Mbps data rate to support various multimedia applications. However, the characteristic of handoff in wireless network and the bandwidth requirement of multimedia applications make the network more complex. So how to provide a mobile network to support QoS provisioning by means of efficient and effective management for radio resources became a challenge work.
In this thesis, we study several papers on call admission control (CAC) and bandwidth allocation scheme in wireless networks and also proposed the dynamic guard channel scheme with bandwidth degradation to rate-adaptive connections based on the traffic characteristics. Nevertheless, compared with fixed guard channel scheme and dynamic guard channel scheme without rate-adaptive degradation, the proposed scheme provides better overall performances in terms of call blocking rate (CBR), call dropping rate (CDR), grade of service (GOS), and bandwidth utilization (BU) through extensive simulations.

並列關鍵字

Call admission control ； Dynamic gurad channel scheme

參考文獻

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[2] Geng-Sheng (G.S.) Kuo, Po-Chang Ko, and Min-Lian Kuo, “A Probabilistic Resource Estimation and Semi-Reservation Scheme for Flow-Oriented Multimedia Wireless Networks,” IEEE Communications Magazine, pp. 135-141, February 2001.

[3] Carlos Oliveira, Jaime Bae Kim, and Tatsuya Suda, “An Adaptive Bandwidth Reservation Scheme for High-Speed Multimedia Wireless Networks,” IEEE Journal on Selected Areas in Communications, Vol. 16, No. 6, pp. 858-874, August 1998.

[4] Xiang Chen and Yuguang Fang, “An Adaptive Bandwidth Reservation Scheme in Multimedia Wireless Networks,” IEEE Globecom 03’, Vol. 5, pp. 2830-2834, 2003.

[5] Xiang Chen, Bin Li, and Yuguang Fang, “A Dynamic Multiple-Threshold Bandwidth Reservation (DMTBR) Scheme for QoS Provisioning in Multimedia Wireless Networks,” IEEE Transactions on Wireless Communications, Vol. 4, No. 2, pp. 583-592, March, 2005.