IEEE 802.16e之具有基於服務品質之動態資源配置之優先權允入控制

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研究生：	廖昕昱 Hsin-Yu Liao
論文名稱：	IEEE 802.16e之具有基於服務品質之動態資源配置之優先權允入控制 Prioritized Admission Control with QoS-Based Dynamic Resource Allocation in IEEE 802.16e
指導教授：	鍾順平 Shun-Ping Chung
口試委員:	王乃堅 Nai-Jian Wang 張立中 Li-Chung Chang
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2008
畢業學年度：	96
語文別：	英文
論文頁數：	54
中文關鍵詞：	頻寬預留、允入控制、寬頻無線存取、IEEE 802.16e 、WiMAX 、服務品質
外文關鍵詞：	bandwidth reservation, admission control, broadband wireless access (BWA)
相關次數：	點閱：393 下載：1
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IEEE 802.16e 移動寬頻無線存取網路系統的發展主要是為了滿足多種不同快速成長中的網路服務需求。為了達到多種不同的服務所需要的服務品質，一個連結導向、允入控制和資源預留的機制是必要的。為了改善給IEEE 802.16e的服務品質，在這篇論文中我們提出了一套基於服務品質之動態資源配置之優先權允入控制的機制給IEEE 802.16e系統，而這IEEE 802.16e系統使用了正交分頻多工和採用了可調適的調變和編碼技術。在這篇論文所提的機制中，我們動態的預留了一些系統的資源提供給那些準備有可能交握的移動用戶並且提供給這些移動用戶所需的保證資源。在IEEE 802.16e中提供了五種不同服務等級的服務給這些移動用戶，而我們這篇論文中所提出的機制也符合了IEEE 802.16e中所定義的服務品質參數。在系統效能改善方面，動態頻寬預留和交握佇列機制提供了更高的優先權給有交握需求的使用者，而優先權允入控制機制則提供了各種不同的允入優先權給各種不同的服務需求。在這篇論文中我們使用了從實體層到網路應用層的跨層級式模擬去評估我們所提出的機制。從模擬結果中我們可以得知，所提出來的機制不僅僅最大化頻寬使用率而且大大的改善了交握的連線失敗機率和含權重的阻塞機率，並且我們所提出的機制還提供了一個合理的優先權順序給予在IEEE 802.16e中不同服務等級的新連線請求和交握連線請求。特別是這個利用了動態頻寬預留和交握佇列的機制，可以讓更多的新連線請求和交握連線請求允入，並且不會讓目前已在連線的服務品質下降。

The IEEE 802.16e Mobile Broadband Wireless Access Networks (MBWANs) system is developed to cater for the rapidly growing requirement for various wireless services. Since the various services provided by IEEE802.16e are connection-oriented, admission control and associated resource reservation mechanisms are needed to achieve desired quality of service (QoS). In order to improve the QoS-guaranteed service for IEEE 802.16e-base MBWANs, this thesis proposes a prioritized admission control with QoS-based dynamic resource allocation policy for the IEEE802.16e system that use the orthogonal frequency division multiple access and adopt the adaptive modulation and coding technique. In the proposed policy, we reserve some system resource as admission guard bandwidth, which is dynamically adjusted according to the estimation of potential handover services. Because IEEE 802.16e supports five classes of service as well as mobility, this proposed policy is compatible with the QoS parameters for each service class defined in the standard. As improvements, the dynamic guard channel and handover queue schemes are used to give handover connections higher priority and a prioritized admission control scheme to prioritize different service classes. The proposed policy is evaluated by using the cross-layer simulation that covers from the physical layer to the Internet application layer. The simulation results show the proposed policy not only maximizes the bandwidth utilization, but also greatly improve the performance of connection-dropping probability (CDP) and weighted-blocking probability (WBP), and the use of the proposed schemes provides a reasonable priority order of new originated connections and handover connections of different service classes for the IEEE 802.16e-based MBWANs. Particularly, for handover connections, the proposed scheme takes advantage of dynamic guaranteed channel reservation scheme and handover queue to admit more new incoming and handover connections while the QoS guarantee of the existing connections in not degraded.

CONTENTS
Abstract………………………………………………………………………………......i
誌謝………………………………...............................................................................iii
Contents……………………………………………………………………………... iv
List of Figures………………………………………………………………………...v
List of Tables………………………………………………………………………....vi
Chapter 1Introduction …...………………………………………………………1
Chapter 2IEEE 802.16e-based MBWANs overview……………………………3
2.1Architecture ………………...……………………………………4
2.2Physical Layer …………………………..……………………….5
2.3MAC Layer..…………………………………………………….10
Chapter 3Prioritized admission control with QoS-based dynamic resource
allocation and policy…………………..........................................16
3.1The proposed prioritized admission control policy……..………16
3.2The dynamic resource allocation in the proposed scheme……...19
Chapter 4System model…...……………………………………………………23
4.1Cell configuration……….……………………………………….23
4.2System parameters…………….………………………………...24
4.3Propagation Environments…...…...………………..…………....26
4.4Station Parameters…...…...………………………...…………....27
4.5Handover Parameters…...…...………………………………….28
4.6UDP and IP Parameters…...…...……………………...………....28
4.7Traffic model assumptions…...…...……………..……………....28
Chapter 5Simulation results……………..……….……………………………..32
Chapter 6Conclusions…………………………………………………………..51
References……………………………………………………………………………53











List of Figures
Figure 2-1IEEE 802.16e-based MBWANs……………………………………….3
Figure 2-2IEEE 802.16 Protocol Layer.....……………………………………….4
Figure 2-3Cyclic Prefix insertion in an OFDM symbol........………………….....5
Figure 2-4WiMAX OFDMA TDD Frame …………………………………….....9
Figure 2-5Initialization steps ………...…………………………………………..10
Figure 2-6QoS architecture of IEEE 802.16…………………..………………...13
Figure 3-1Seven hexagonal cells…..……………………………………………20
Figure 3-2Handover detection base on signal strength.…………………………20
Figure 4-1Message flow of handover initiated by the mobile…………....……..28
Figure 4-2Packet trace in a typical DL FTP session …...……………………….30
Figure 4-3Packet trace of a typical web browsing session………………...……31
Figure 4-4Contents of a packet call…………………………..............................31
Figure 5-1The MS throughput according to the distance from serving BS…......40
Figure 5-2CDP and CBP of the ACP and ACP&FGC algorithms..…………….40
Figure 5-3Bandwidth Utilization of the ACP and ACP&FGC algorithms……...41
Figure 5-4 Bandwidth Utilization of the ACP&FGC with various guard
channels………………………………………………………………41
Figure 5-5 CBP and CDP of the PAC&FGC with various guard channels….…...42
Figure 5-6 CBP and CDP for PAC&FGC and PAC&DGC.……………………..42
Figure 5-7 Bandwidth utilization between PAC&FGC and PAC&DGC ………..43
Figure 5-8 CBP and CDP using PAC&DGC with various ∆db …...……………..43
Figure 5-9 Bandwidth Utilization of the ACP&DGC with various ∆db………….44
Figure 5-10 CBP and CDP between PAC&DGC and PAC&DGC&PHQ …...…...44
Figure 5-11Delay time of the ACP&DGC&PHQ algorithms……………………45
Figure 5-12Packet Drop Rate of the ACP&DGC&PHQ algorithms..……………45
Figure 5-13 CBP and CDP between PAC&DGC&PHQ and
PAC&DPGC&PHQ…………………………………………………..46
Figure 5-14 CDP using PAC&DPGC&PHQ with various γ..………...………...46
Figure 5-15CBP using PAC&DPGC&PHQ with various γ…………………….47
Figure 5-16 Connection-dropping probability of the five algorithms……………..47
Figure 5-17 Connection-blocking probability of the five algorithms……………..48
Figure 5-18 The bandwidth utilization (BU) of the five algorithms………………48
Figure 5-19 The Weighted Blocking Probability of the five algorithms………….49
Figure 5-20 The CDP&CBP comparison of various ratio of mobiles per cell……49
Figure 5-21 The BU comparison of various ratio of mobiles per cell…………….50

List of Tables
Table 2-1OFDM PHY data rates in Mbps ………………………………………6
Table 2-2 Supported Code and Modulations………………..……………….…...7
Table 2-3 The QoS parameter of IEEE 802.16e………………………………...........12
Table 4-1Possible WiMAX configurations for the 3.3-3.8 GHz band .………..24
Table 4-2OFDMA Parameters……………………………………….…………24
Table 4-3TDD Frame configurations used …………………………..………...25
Table 4-4PUSC Parameters ………………………………………….………...26
Table 4-5SNR required for considered burst profiles. (CTC – Convolutional Turbo Codes)……………………………………………….………...26
Table 4-6 Fading Margins Adopted……………………………………………..27
Table 4-7 BS and SS parameters………………………………………………..27
Table 4-8 Real-Time traffic model……………………………………………...29
Table 4-9 Non-Real-Time traffic model………………………………………...30
Table 5-1 Useful Maximum DL Data Rates by calculation…………………….33

                                

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