臺灣博碩士論文加值系統

在整合式語音與資料服務無線網路中，讓語音訊務的保護頻道分配一部份給數據訊務共同使用，同時在此共享的保護頻道中給予遞交通話較高的優先權的分享式數據保護頻道策略，將比使用專用的數據保護頻道方式擁有較高的效能。本論文研究在使用分享式數據保護頻道策略的無線網路中加入允入控制策略，此策略動態地調整保護頻道的數量以提高頻道使用效率以及滿足不同服務的服務品質。此策略設計的著眼點在於是否快速的收斂以及較低的計算複雜度要求。在系統模擬中分別針對新通話的阻塞機率、遞交通話的強制中斷機率以及資料封包的平均延遲時間做討論與評估。
在此策略的三種服務中，遞交通話擁有最高的頻道優先權。並且由模擬結果得知，遞交通話強制中斷機率必定會保持在所訂定的標準之下。然而對新通話服務與資料訊務服務之間的服務品質提升則沒有任何偏袒。而由模擬結果得知，有使用允入控制策略相對於沒使用的狀況，其新通話與資料訊務會得到較好的服務品質。

Guard channel sharing scheme, which the data traffic can use parts of the residual channels of voice guard channels on condition that the handoff requests have higher priority over data packets, has been evidenced that outperforms than conventional dedicated data guard channel scheme in integrated voice/data mobile networks. In this thesis, we investigate a dynamic guard channel allocation scheme based on the guard channel sharing scheme that can jointly provide dynamic allocation of both voice and data guard channels in order to improve channel utilization and consequently keep the different services’ QoS requirements as possible. The proposed scheme is convergent quickly and easy in implementation. Simulations are used to evaluate the performance which includes new call blocking/ handoff call force terminating probabilities, and average data packet delay of the system.
With this scheme, the handoff calls have the highest priority over the other two traffics and hold the handoff call force terminating probability under required target. To the new call attempts and data traffic, this scheme does not bias toward either service. Along with the guard channel sharing scheme, both new call attempts and data traffic obtains better service than that without dynamic channel allocation and guard channel sharing schemes.

目錄
英文摘要…………………………………………………………………….Ⅰ
中文摘要…………………………………………………………………...Ⅱ
致謝………………………………………………………………………….Ⅲ
目錄………………………………………………………………………….Ⅳ
圖索引………………………………………………………………….……Ⅵ
表索引………………………………………………………………………Ⅶ

第一章 緒論………………………………………………………………….1
1.1 研究背景…………………………………………...…………...…2
1.2 研究動機與目的…………………………………..………………4
1.3 章節概要………………………………………….……………….5

第二章 相關背景討論..…………………………………………………...6
2.1 優先權佇列策略………………………………………………….6
2.2 頻道分配之細胞間策略………..…………...…...…………………8
2.2.1 固定頻道分配………………………………………………….8
2.2.2 動態頻道分配………………………………………………….10
2.3 頻道分配之細胞內策略………..…………...…...………………11
2.3.1 固定保護頻道分配策略……………………………………….13
2.3.2 動態保護頻道分配策略……………………………………….16
2.4 通話允入控製策略………..…………...…...…………………18
2.4.1 允入控制策略對訊號品質的控制…………………………….20
2.4.2 允入控制策略對遞交強制中斷機率的控制………………….21
2.5 整合封包無線電服務………..…………...…...…………………22
2.6 相關機率分佈簡介………………………………………………26
2.6.1 帕松分佈………..…………...…...……………………….…26
2.6.2 柏拉分佈………..…………...…...……………………….…26

第三章 共享式保護頻道動態分配策略……………………………….....28
3.1 系統架構…………………………………………………………..28
3.1.1 語音訊務傳輸模組……………………………………………30
3.1.2 資料訊務傳輸模組……………………………………………31
3.2 共享式保護頻道動態分配策略…………………………………32

第四章 系統模擬與討論………………………………………………….35
4.1 系統模擬…………………………………..………………………35
4.2 結果討論…………………………………..………………………36

第五章 結論與未來相關研究……………………………………………41

參考文獻…………………………………………….………………………43

圖索引
圖1.1 無線電資源管理模組…………………………………………….......2
圖2.1 無線網路的遞交通話程序……………………………………….......7
圖2.2 (a) 先保留機制………………..……………………………………12
圖2.2 (b) 後保留機制…………………..…………………………………12
圖2.3 (a)一般的固定保護頻道策略之狀態圖……………………………13
圖2.3 (b)部份保護頻道策略之狀態圖……………………………………13
圖2.4 (a)專用數據保護頻道策略…………………………………………15
圖2.4 (b)分享數據保護頻道策略…………………………………………15
圖2.5 Huang所提出的動態保護頻道策略……………………………...…17
圖2.6 (a)GSM系統基本架構……………………..………………..…...…24
圖2.6 (b)GPRS系統基本架構…………...………..………………..…...…24
圖3.1 系統模組…………...………..………………..………………......…29
圖3.2 SDGC分配架構…...……..…..………………..………………......…29
圖3.3 全球資訊網傳輸模組……..…..……..………..……………….........31
圖3.4 動態語音/資料訊務保護頻道分配策略……..………………..........34
圖4.1 語音訊務保護頻道收斂狀況…..…..…..……..……………….........38
圖4.2 資料訊務保護頻道收斂狀況…..…..…..……..……………….........38
圖4.3 新通話的阻塞機率..……..…..……………….………………......…39
圖4.4 遞交通話的強迫中斷機率.…..…………...….………………......…39
圖4.5 封包的平均延遲時間…..…..……………….………………........…40
圖4.6 封包的丟棄機率…..…..……………….………………........………40

表索引
表2.1頻道分配技術分類(細胞間的頻道分配)…………..…………….......8
表2.2動態頻道分配技術分類………………………........…………….......10
表2.3保護頻道策略…………………………………........…………….......11
表2.4允入控制之分類…………..………………………........…………….19
表2.5訊號品質的控制之分類……………..………………………........….20
表2.6遞交通話的控制之分類……………..……………………….............21

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