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研究生：	林建良 Lin, Jian-Liang
論文名稱：	整合異質無線網路之資源管理 Resource Management in Integrated Heterogeneous Wireless Access Networks
指導教授：	鄭憲宗 Cheng, Sheng-Tzong
學位類別：	博士 Doctor
系所名稱：	電機資訊學院 - 資訊工程學系 Department of Computer Science and Information Engineering
論文出版年：	2006
畢業學年度：	94
語文別：	英文
論文頁數：	60
中文關鍵詞：	資源管理、服務品質、無線網路、行動化
外文關鍵詞：	QoS, Wireless, Resource Management, Mobility
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　　近幾年來，無線通訊技術的發展可以說是一日千里，有許多的無線網路已經被實際用來提供使用者無線存取的服務，也有不少新的無線網路規格正在制定中。雖然新的技術所提供的無線傳輸速率越來越快，但是無線資源畢竟是有限，因此，對於未來對傳輸品質及速率更加要求的多媒體資訊，要如何有效的使用這些資源提供使用者品質保證的通訊服務，也就變成了無線網路中重要且不可或缺的關鍵。
　　在無線領域中有兩個主要的議題會被提出討論，第一個是無線資源的管理、另一個是行動化的管理。本篇論文的研究在於如何充分利用無線網路有限的傳輸頻寬資源並且提供使用者無接縫的服務。第一部份針對在第三代無線通訊網路中，MAC層的無線資源管理所開放的部分進行研究。在第三代無線通訊網路的MAC層中必須將與服務相關的logic channel對應到與實體層傳輸資料相關的transport channel，這個對應的動作稱為TFCS (Transport Format Combination Selection)。由於這個對應動作必須快速找到符合的頻道對應方式，而且在規格中只有簡單的定義要如何做對應的三個準則與標準，因此考慮到要減少transport channel中因內部碎裂所導致的無線資源浪費，我們提出了動態資源配置的方式。接著考慮到在第三代無線網路中傳遞資料量的大小會影響到傳輸時的BER (Bit Error Rate)，進而影響到實際正確傳輸的資料量，我們又根據採用不同的TFC (Transport Format Combination)所造成的不同BER值，來過濾掉不適合在目前傳輸環境下使用的TFC。然後在剩餘的TFC中利用之前提到的資源配置方式做選擇，藉此達到頻道分配以及服務品質的最佳化。
　　論文的第二部分則是考慮到如何充分並且有效的利用異質無線網路上的頻寬資源以提供使用者無接縫的服務。由於目前所提出的許多無線網路都是各自定義並獨立架設，為了有效的利用這些無線網路的頻寬，首先我們在論文中提出階層狀的架構來整合這些異質無線網路；接著針對此架構下的異質網路提出資源管理協調的機制，透過這個機制整合所有異質網路的頻寬來盡量的減少Handoff Calls被中斷的機率，接下來提出動態的資源管理機制，根據目前網路頻寬的使用狀況動態的調整guard channel或threshold的值。藉由此動態調整的機制，希望能夠在不影響Handoff Calls被中斷的機率下，盡量的讓更多的New Calls可以被系統服務。
　　在論文的最後提出協調式資源管理機制之系統及流量的模型，根據模型的參數設定推導出此機制之分析模型，並藉由一趨近的方法來簡化所導出的分析模型運算式。然後利用此數學的運算式來驗證我們的模擬結果是正確的。最後根據模擬程式來證明我們所提出的動態調整機制能如預期般提升異質無線網路資源的使用。

　In recent years, the development of wireless communication technology is at a tremendous pace. Many wireless networks have already been used to offer some wireless services to the user actually. Besides, there are many new wireless network specifications in course of designing too. Though the data transfer rate of new wireless technology is more and more fast, wireless resource limited after all. Therefore, to transmit the multimedia information that the quality and speed require further to the future, how to use these resources effectively to offer the communication service that the quality can be guaranteed to users turns into the important and indispensable key in a wireless network.
　When we design a wireless network, some problems of wireless communication and mobility management will need to be solved. The research of this dissertation lies in how to utilize the limited radio resource of wireless networks more efficiently and manage the mobility of end users to support seamless communication. At the first, we aimed at the MAC layer of third generation wireless network that the part of resource management was opened and carried on research. One function of the MAC layer, the TFCS (Transport Format Combination Selection), is how to map the transport channel to the logical channel appropriately. Where the transport channels are correlated with the data transmission of physical layer and the logical channels are correlated with the services provided with users. This function must find the way to map the channels as fast as possible and there were only three simple principles and criterions defined in the specification. Therefore, take the waste of wireless resources into consideration due to the internal fragmentation, a TFCS mechanism were proposed to utilize the wireless resources. Besides, we considered the relationship between the size of data to be transmitted and the BER (Bit Error Rate). We used a method to filter out some infeasible TFCs according to the BER of each TFC in the wireless environment at present. Afterward our TFC selection method could map the channels faster and more appropriately to utilize the wireless resources more efficiently and support the user’s QoS requirement.
　How to adequately and effectively use the wireless resources of heterogeneous wireless networks was the next emphasis, the mobility management, of this dissertation. Because lots of wireless networks were defined and implemented independently, to utilize the resources of these wireless networks more efficiently, we proposed a hierarchical architecture to integrate these heterogeneous wireless networks at first. Then we proposed a coordinated call admission control mechanism to utilize the resources of these heterogeneous networks on this hierarchical architecture. To support seamless communication services to mobile users, the coordinated mechanism could decrease the handoff call dropping probabilities according to the reservation scheme and the multiple wireless access interfaces. Besides, we proposed a dynamic adjusting method to regulate the value of guard channel or new call threshold in terms of the utilization of the radio resources of these wireless networks at present. Therefore, we could accept as many new calls as possible without increasing the handoff call probabilities and decreasing the QoS requirement of the calls in serving.
　Finally, in order to prove the correction of our simulation results, we tried to analysis the system and call admission control mechanism through Queuing Model. According to the equations derived from the models and the approximation method, we could prove that the simulation results were correct to demonstrate that the coordinated call admission control mechanism could utilize the radio resources of these heterogeneous wireless networks well and support users seamless communication services by decreasing the handoff call dropping probability.

Abstract................................................................	I
List of Tables..................................................................	V
List of Figures.........................................................	VI
Chapter 1	 Introduction..................................................	1
1 Motivation.........................................................	1
1.1 Radio Resource Management.......................................	2
1.2 Mobility Management.............................................	2
2 Our Approach.......................................................	3
2.1 TFCS with BER Filtering.........................................	3
2.2 Coordinated Call Admission Control..............................	3
3 Summary of Contributions...........................................	4
4 Organization.......................................................	4
Chapter 2 Background and Related Works..................................	5
1 The Third Generation Wireless Communication Network................	5
1.1 Overview........................................................	5
1.2 Channel Structure...............................................	6
1.3 Transport Format Combination Selection in UE....................	7
1.4 TFCS Parameters.................................................	9
1.5 The Relationship between the TFCS, SF, and BER..................	11
1.5.1 The Q-Function...............................................	11
1.5.2 The erf and erfc Functions...................................	13
1.5.3 Determination of Radio Frame Size and SF.....................	13
1.5.4 The Relationship between SF and BER..........................	15
1.6 Related Work....................................................	16
2 Introduction of Heterogeneous Wireless Networks....................	17
3 Resource Management with Mobility..................................	17
Chapter 3	 Radio Resource Management Techniques for UE-MAC in 3GPP W-CDMA       Systems.................................................................	19
1 The Architecture of Radio Resource Management......................	19
2 BER Filtering Strategy.............................................	21
3 TFCS Assignment and Selection Algorithm............................	24
3.1 The First_fit Algorithm.........................................	25
3.2 The Best_fit Algorithm..........................................	25
3.3 The Dynamic_fit Algorithm.......................................	26
3.4 The Selection Step..............................................	27
4 Performance Evaluation.............................................	28
5 Summary............................................................	33
Chapter 4	 A Coordinated and Dynamic Call Admission Control Mechanism Over an IP-based Integrated Wireless Access Networks............................	34
1 An Integrated Wireless Networks Architecture.......................	35
2 The Coordinated Call Admission Control Protocol....................	37
2.1 Coordinated Call Admission Control Mechanism....................	37
2.2 Dynamic CNCB....................................................	40
2.2.1 Adjusting Method 1 (D-CNCB1).................................	40
2.2.2 Adjusting Method 2 (D-CNCB2).................................	41
2.3 Dynamic CCFP....................................................	42
2.3.1 Adjusting Method 1 (D-CCFP1).................................	42
2.3.2 Adjusting Method 2 (D-CCFP2).................................	42
3 Simulation Results.................................................	43
4 Summary............................................................	46
Chapter 5	 The Queueing Model of Dynamic and Coordinated Call Admission Control Mechanism...............................................................	47
1 Analytic Model.....................................................	48
1.1 System Model....................................................	48
1.2 Traffic Model...................................................	49
2 Performance Analysis...............................................	50
2.1 The CNCB Mechanism..............................................	50
2.2 The CCFP Mechanism..............................................	51
3 The Numerical and Simulation Results...............................	54
4 Summary............................................................	55
Chapter 6 Conclusions...................................................	56
Bibliography............................................................	58
                                    

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校外：2006-02-07公開

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