cdma2000基於服務品質利用適應性視訊串流的無線資源管理

Abstract

本論文旨在提出一個能夠同時增進系統資源使用率及提昇客戶服務品質的無線資源配置方案，稱之為客戶回饋輔助性無線資源管理。客戶回饋輔助性機制這樣的概念可以被延伸應用到企圖提供多媒體服務，特別是即時視訊串流服務，的所有無線通訊系統上。每一次的資源重新配置包含了對使用者在前端的無線系統使用的優先權排序及後端多媒體伺服器的串流壓縮率調整。客戶回饋輔助性機制利用了客戶緩衝器的資訊、目前基地台端的資料排隊量、無線頻帶的狀況以及系統的負載量來決定優先權跟壓縮率。相較於結合了客戶主導性(client-based)或無線網路回饋性(radio network feedback)調變方案的公平排程無線資源管理，模擬結果顯示了當系統負載被考量品質的傳呼允許機制(call admission)限制在合理的容量下，客戶回饋輔助性機制能夠提昇系統總處理資料量並降低客戶緩衝器匱乏的機率。

This thesis proposes a new radio resource allocation (RRM) scheme, called client feedback assisted (CFA) RRM, to improve system resource utilization rate and at the same time to enhance individual quality of service (QoS). The concept of CFA is applicable to all wireless communication systems which tend to serve multimedia applications, especially real-time video streaming. The resource relocation includes rescheduling priorities in a front-end wireless system and reassigning source bit rate of each streaming in a back-end multimedia server. CFA exploits feedback information from a client buffer, current fullness of base station queue, RF condition, and system loading to decide the priority and source bit rate. As compared with a fairness scheduling RRM, which combines client-based and radio network feedback (RNF) as its streaming adaptation scheme, simulation results show that CFA solution can improve system throughput and decrease the probability of client buffer underflow.