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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8885


    Title: 具服務品質保證分碼多工多媒體系統之效能改進;Performance Improvement in a CDMA Multimedia Cellular System with QoS Guarantee
    Authors: 黃博俊;Bor-Jiunn Hwang
    Contributors: 電機工程研究所
    Keywords: 資源保留;資源借用;頻道資源分配機制;排程機制;resource reservation;respurce borrowing;channel assignment;schedulling
    Date: 2001-12-21
    Issue Date: 2009-09-22 11:37:02 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: CDMA能提供較傳統TDMA與FDMA等更多系統容量,為下一代通訊系統重要發展之技術;而多媒體為未來人們對通訊之基本需求,因此如何提供服務品質保證為下一代多媒體服務的CDMA通訊系統所必須面對的課題。通常系統需藉由資源保留(Resource Reservation)、允入控制(Call Admission Control, CAC)和排程機制(Scheduling)等方法以達成各種用戶不同之需求,本文即是基於此研究如何增進提供服務品質保證之系統效能。 本文分三大部分探討多媒體CDMA系統容量之問題及改善方案。於第二章探討當系統提供資源保留時之系統容量,並評估不同資源保留機制在不同狀態下如系統負載量與交替率(Handoff probability)等對系統效能之影響,於第三章則針對系統提供資源保留時,可能造成資源無法有效運用,以致於降低系統效能,提出三種資源借用機制(Resource-borrowing scheme)來提昇資源使用率以增進系統整體效能,於第四章則是探討在多速率隨意碼直接序列分碼多工(Multi-Chip rate CDMA)系統之頻道資源分配機制(Channel Assignment scheme),在文中提出五種頻道資源分配機制,研究不同機制在不同系統負載量下,各種用戶進入系統之頻道分配情形,並評估對系統效能之影響,於第五章則是探討當無線系統與有線系統介接時,在此狀態下系統受限於無線系統資源與有線系統資源下,系統之允入控制機制如何提供用戶品質保證,並研究排程機制對系統效能之影響。 Some of feasible techniques of CAC schemes for a CDMA system in order to meet diversified QoS requirements and promote performance are concerned in this dissertation. We propose several schemes concerned with resource borrowing to improve the performance of a DS-CDMA cellular system since resource reservation schemes were adapted. And, we propose a channel assignment based CAC algorithm in a multi-chip-rate DS-CDMA cellular system supporting multi-rate services with guaranteed QoS. Also, we will propose a CAC algorithm to administer the requests based on the resources in the CDMA system (wireless network) and in the egress of base station (BS) (wired network) to maintain diversified QoS requirements for each session. In this dissertation, computer simulation is used to evaluate the system performance including blocking probability, dropping probability, system capacity, and maximum tolerable delay.
    Appears in Collections:[電機工程研究所] 博碩士論文

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