由於在個人通訊網路上多媒體服務需求的快速成長，針對在個人通訊網路上有效率的傳輸資料變的非常的重要，尤其是還要同時提供語音（voice）與資料（data）整合的適當服務品質（QOS）。在這一篇論文中，我們提議語音的傳輸使用電路交換模式（circuit switched）、而資料的傳輸使用封包交換模式（packet switched）。另外語音傳輸比資料傳輸具有較高的優先權，當語音傳輸有剩下的頻寬才供給資料來做傳輸；否則，資料會儲存在資料暫存區等待有閒置的頻寬。我們考慮兩種可以降低因換手導致連線中斷機率的方法；這兩種方法分別是每一個基地台保留部分頻寬（Reserved Channel）給換手連線（Handoff calls）使用和當連線換手時如果沒有足夠的頻寬，則將換手連線先放置優先權的暫存區（Queuing Priority）等待釋放出的頻寬。同時我們也考慮一種基本的機制：對換手連線不做任何降低中斷連線機率處理的方法。我們利用流體分析（Fluid Analysis）來研究上述三種機制下資料暫存區的效能，從我們的分析中，我們可以得到一個允許連線控制（Call Admission Control）的機制，可以適用於語音跟資料傳輸。另外，從這個分析我們也可以知道保留頻寬機制不僅可以有效降低換手連線的中斷，更可以有效率的提升資料傳輸的服務品質。本篇論文的另一個貢獻是發展出擾動分析（Perturbation Analysis）能夠更快、更有效率的解決流體分析上的問題。

In this paper we study the quality of service of integrated voice and data services in a wireless network. The voice traffic is transmitted in circuit-switched mode and data traffic is transmitted in packet-switched mode. Voice traffic has high transmission priority and data packets are transmitted only when there are available channels not used by the voice traffic. Otherwise, the data packets wait in a data buffer. We consider two schemes to reduce the forced termination probability for the handoff voice calls. The two schemes are the reserved channel scheme and the queueing priority scheme.
We apply a fluid analysis to study the performance of the data buffer under the two handoff schemes and the basic system in which there is no arrangement to reduce the forced termination probability of handoff calls. From this analysis, we derive admission controls for voice traffic as well as for data traffic. This analysis also enable us to conclude that the reserved channel scheme not only is more effective in reducing the forced termination probability of handoff calls, it is also more effective in providing the QOS guarantee for the data traffic. Another contribution of this paper is to develop a

perturbation analysis to solve the fluid models efficiently and quickly.

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