針對 IEEE 802.15.3 個人無線區域網路系統之動態時間分配與回饋式控制排程方法

Abstract

為了達到短距離、高品質的影像/聲頻無線傳輸，由IEEE 802.15.3組織所訂立的超寬頻無線個人區域網路標準近年來十分受到矚目。此系統可以提供11至55 Mbps的傳輸速率，並且採用了基於分時多重接取技術的媒體接取控制協議。然而，因為缺少針對即時性可變動位元率服務所設計的通道時間分配機制，此系統對於該類型的資料傳輸支援性並不佳。此篇論文提出一個搭配回饋控制排程的動態通道時間分配策略，來試著解決這個窘境。我們建立了一模擬平台來評估此策略與原有系統在不同延遲限制下的表現，而模擬結果亦驗證所提出的方法可以大幅降低資料遺失的比率與傳輸延遲，同時得到較高的系統效能。

The Ultra Wide Band (UWB) standard, developed by IEEE 802.15.3 task group, is one of the popular candidates to achieve high quality video/audio wireless transmission within short range connection. Based on Time Division Multiple Access (TDMA), the data rates of 802.15.3 are ranged from 11 to 55Mbps. However, due to the lack of effective mechanism to reserve proper channel time for real time variable bit rate (rt-VBR) applications, the system cannot guarantee the quality of service (QoS). In this thesis, we propose a feedback control based dynamic channel time reservation scheme to achieve the QoS requirements for rt-VBR applications. A simulation platform is established to evaluate the performance of proposed and standard scheme under different QoS requirements. The simulation results show that with higher data throughput, the proposed method can still reduce the packet loss rate and delay significantly.