A study of QoS feedback and improvement mechanism for WiFi multicast streaming
|關鍵字:||IEEE 802.11;群播;回饋機制;能量調節;IEEE 802.11;Multicast;Feedback mechanism;Power-adjustment|
在本篇論文中，我們一開始介紹第二層無線網路下的群播服務。再者我們會提出幾個問題與提供解決方式，我們提出的架構有下列特色:(1) 實作回饋機制服務。(2) 增進發送端對於群播服務的整體感知。(3) 藉由群播回報的傳送功率動態調整發送端的傳送功率。(4) 尋找合適的群播接收者的收訊範圍。在這篇論文中，我們在無線區域網路中提出新的群播搭配回饋技術以及相關的運作媒體存取控制(MAC)層訊息，然後比對一般傳統方式和討論可適當增加的接收範圍與其效能改進。|
The Internet access through wireless network becomes more and more popular. In recent years, wireless local-area network (WLAN) users are also growing quickly due to the rapid development of the mobile devices. With this development of wireless network, we can enjoy various advanced services using our mobile device. These services are common in the area of university campus, airport, transportation stations, or tourist sites. The use of the wireless local-area network service has been spread extensively. However, to send the same media stream to multiple receivers, we need to consider the efficiency of the data transmission, and multicast is a candidate solution. Since the multicast packets will not be acknowledged, there is no way to evaluate the efficiency of the data delivery service in the wireless network. Furthermore, if some of the users are leaving the coverage area of the WLAN, the sender would not be noticed. In this thesis, we first review wireless layer-2 multicast communications, then we raise several issues and propose solutions to these problems. Our proposed architecture features the following characteristics: It (1) implements acknowledgement for multicast communications, (2) improves overall network awareness on WLAN multicast, (3) find member transmission power and do server power-adjustment, (4) increases the coverage for all members. We also show and compare the traditional methods and discuss the appropriate techniques as much as possible. Consequently, we propose new method based on X-beacon mechanism and corresponding MAC management messages, we then applies the proposed method to Wireless-LAN network and evaluate their performance improvement.