本論文藉由可變動位元率控制(VBR)之特性如何有效率作傳遞服務在寬頻無線即時多媒體網路，在此資料率(data rate)控制機制是提供上行競爭頻道一個即時輪詢品質服務，同時系統設定固定傳送交通率參數作封包遞送服務，也意謂本文利用在無線寬頻網路之MAC層上採取傳送訊框服務機制，考慮佇列排程演算法予以分配頻寬資源。換言之，研究目的解決受約用戶端下競爭資源不均的頻寬且同時改善時間延遲抖動率大的問題，我們以無線寬頻網路MAC layer所提供之規律間隔時間輪詢服務品質方式去傳送多媒體串流。本研究植基於在競爭輪詢行動用戶端情況下，提出即時輪詢服務品質之排程演算法，其目的是要解決競爭用戶端頻寬分配不均問題。這研究提到頻寬分配法則是採用Max-Min fairness queue 排程演算，這主要是因為要在無線寬頻網路環境下，以有限即時時間方式傳送多媒體可變位元率串流，且讓base station 能夠有效管理頻寬資源，這論文首先貢獻是比較所提extension 即時輪詢品質服務之max-min fairness queue排程演算法，在其傳遞可變動多媒體串流時會有較好服務品質比一般所提即時排程演算法則。
其次本論文另一貢獻是實際以 VIDEO串流在下行(downlink) base station端作品質服務之效能評估，我們將行動用戶端之串流給予End-to-End 方式導入IPTV軟體平臺架構，在無線寬頻網路下有效傳送IPTV 串流；再者本研究實驗方式將導入NS-2作網路模擬。藉此可以評估base station是否能有效控管無線多媒體影音網路其傳遞串流之狀況，如此改善IPTV串流品質。其次這研究實驗工具來源是參考及改善NIST協會機構所提出NS-2 軟體之WiMAX模擬元件模組，我們採用實際網路IPTV 軟體作整合設計，同時分析比較不同IPTV 串流(諸如PPstreaming 及CBR)其品質服務之優缺點, 這目的是可以透過實際IPTV串流模擬觀察給予串流作彈性速率調整，如此無線寬頻網路傳遞多媒體IPTV串流時；對於服務品質量測包括傳遞串流之產能效益、行動用戶端競爭資源下之封包遺失率、不同無線子載波頻道分配技術下訊框傳遞效益優劣…等能有效管理評估，我們實驗結果表現出在無線環境頻道基於MAC Layer品質服務管理下，運用IPTV 串流所傳遞的訊框，在分析不同調變資料率和多重之行動節點負載率狀態時，PPStreaming能達到較好效能比CBR 所傳遞IPTV 串流方式，我們觀察能促使有效評估影音品質和Coding rate。

This thesis investigates variable rate control strategies for
real-time multimedia variable bit rate (VBR) services over IEEE
802.16 broadband wireless networks. A data rate control mechanism is
derived for the case where the uplink channel provides real time
services and the traffic rate parameter remains constant. This study
shows that the common queuing scheduling algorithms have some
bandwidth allocation fairness problems for real-time polling
services (rtPS) in the MAC layer. In other words, the use of a VBR
for rtPS by a worldwide interoperability for microwave access
(WiMAX) system results in additional access latency jitter and
bandwidth allocation disorder in the transmitted multimedia streams
during the regular time interval polling of subscribe stations (SSs)
for the contention bandwidth request period. However, the proposed
scheduling algorithm solves these SSs contending with bandwidth
resource allocation problems based on an extended real-time polling
service (ertPS) of quality of service pre-programming for a ranging
response non-contention polling period. The adopted bandwidth
allocation of max-min fairness Queue scheduling uses a time
constraint condition to transmit real-time multimedia VBR streaming
in an IEEE 802.16 broadband wireless environment. Our first
contribution is to compare the capacity of multimedia VBR stream and
show that the proposed ertPS scheduling algorithm outperforms other
rtPS scheduling algorithms.

Our second contribution is present a novel and complete toolset to
evaluate the delivery quality of video streaming transmissions in a
simulated wireless broadband network. Internet Protocol-based
Television (IPTV) is a digital television service which delivers
television content via an IP network. The rapid growth of wireless
network technology in recent years has changed, the way people
access the Internet. Adding mobility to IPTV can create a truly
compelling ubiquitous service which spans different network domains
and varied IP-enabled terminals and devices, such as set-top boxes,
PCs and cell phones. However, extending IPTV service to wireless
networks requires overcoming bandwidth bottlenecks and high packet
loss rates. Following the IEEE 802.16 standard, WiMAX features high
data rates and large service coverage, offering a wireless broadband
solution for IPTV services. While previous research has focused on
creating a broadband IPTV service few studies have practically
evaluated IPTV applications in a wireless broadband network
environment. In this thesis, we model and evaluate a common constant
bit rate (CBR) based IPTV application
and an IPTV live streaming (PPStreaming) application
while retrieving IPTV content via a WiMAX network. We also use the
NS2 simulation tool to evaluate the performance of these two IPTV
applications. The evaluation metrics include latency, packet loss,
data rate and throughput statistics when the two IPTV applications
are run in the WiMAX network.

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