臺灣博碩士論文加值系統

下一代高速無線網路中提供各種多媒體的應用，而保證這些應用之服務品質(QoS)是必要的。本論文提出依使用者速度來預留資源(resource reservation)的允入控制，提供在高速無線網路下之品質服務保證(QoS)。在本篇論文中，我們將一個細胞(cell)分成三個區域，非預留區(non-reservation zone)，預先遞交區(pre-handoff zone)，和遞交區(handoff zone)。如果行動台(Mobile Station)移動至預先遞交區(pre-handoff zone)，鄰近的細胞(cell)將預留部份系統資源，而鄰近的細胞(cell)將會每個偵測時間調整一次所預留的部份系統資源以附合目前行動台(Mobile Station)的移動狀況。
本篇論文經由模擬來探討所提出之資源預留機制，在此模擬中無線網路包含七個細胞(cell)，隨意移動之行動台(Mobile Station)，以及多媒體應用，如語音電話、視訊會議、隨選視訊，和檔案傳輸，本機制與固定預留資源的機制做比較，模擬結果顯示可獲得較低的交遞呼叫阻塞率和頻寬利用率。

Providing quality-of-service (QoS) guarantees in the next-generation high-speed wireless networks is necessary in order to support multimedia applications. This thesis proposes the mobility-dependent resource reservation (MDRR) based admission control (AC) to provide QoS guarantees in high-speed wireless cellular networks. In the study, a cell area is divided into 3 zones: non-reservation zone, pre-handoff zone, and handoff zone. Bandwidth is allocated to a connection in a cell where the connection request originates and bandwidth is reserved in the target cell and adjoining cells as mobile users move into the pre-handoff zone. The amount of bandwidth to be reserved is adjusted by the probing time, reflecting the current mobility condition of mobile users.
Performance of the proposed scheme is provided through simulation. The simulated network consists of seven cells, mobile stations with random mobility are assumed, and a variety of multimedia applications such as audio phone, video conference, video on demand, and file transfer are considered. The results show that the proposed scheme provides small connection dropping probability and achieves high bandwidth utilization when an appropriate probing time is chosen. Finally, the fixed bandwidth reservation scheme is compared with the MDRR scheme.

Chapter 1 Introduction 1
1.1 Channel Assignment Strategies 1
1.2 Admission Control Based on Adaptive Bandwidth Reservation 1
1.3 Motivations and Goal 4
1.4 Plan of the Thesis 5
Chapter 2 Wireless Multimedia Network 6
2.1 General UMTS Concept 6
2.2 Mobility Management 7
2.3 Location Service 8
2.4 Handoff in Wireless Network 10
Chapter 3 The Mobility-Dependent Resource Reservation Scheme 12
3.1 Traffic Description 12
3.2 System Environment 13
3.3 The Strategy of Bandwidth Allocation 14
Chapter 4 Simulation and Results 26
4.1 Simulation Model and Assumption 26
4.2 Simulation Results 28
4.3 Comparison with Fixed Bandwidth Reservation scheme 40
4.4 Comparisons of MDRR scheme with Preemptive/Non-preemptive 44
Chapter 5 Conclusions 47
References 49

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