臺灣博碩士論文加值系統

在第三代行動電話系統,提供多媒體語音服務,，像是網路瀏覽或是影像傳輸是非常重要的。在無線網路環境下，高錯誤率一直被視為傳輸上的障礙。傳輸控制協定(TCP)被用於多數的網路傳輸應用上，可是它卻是被設計用來傳輸於有線的環境。因此，一些機制被提出用來解決在無線環境下傳輸的問題。廣播連接協定(RLP)首先在IS-95的系統下提出來的，它被用來在傳輸控制協定(TCP)發現錯誤前先解決這些錯誤。然而在第三代行動電話系統,廣播連接協定(RLP)似乎不足以解決傳輸控制協定(TCP)在無線環境下傳輸的問題。因此，多媒體存取控制層(MAC)裡的重傳機制被提出用來幫助傳輸控制協定的效能，尤其當傳輸速度到每秒百萬位元時(Mbps)。在這篇論文裡，我們研究了多媒體存取控制層(MAC)裡的重傳機制與傳輸速率的關係。我們發現多媒體存取控制層(MAC)裡的重傳機制在高速的效能會比低速(0.5Mbps)好，尤其在相當高速的時候(2Mbps)。此外我們還發現了較短的封包長度較適合於多媒體存取控制層(MAC)裡的重傳機制。此外我們也發現了，傳輸控制協定(TCP)過去被認為不適用於影像傳輸，可是在我們的模擬裡，有著多媒體存取控制層(MAC)裡的重傳機制，傳輸控制協定(TCP)被用來傳輸影像是有可能的。因為傳輸控制協定(TCP)，具有重傳與網路壅塞控制可提供較好的影像品質。所以，第三代甚至第三代之後的通訊系統，多媒體存取控制層(MAC)裡的重傳機制勢必要存在於系統內。

Providing multimedia services, like web browsing or video streaming, is very important in third generation cellular system. In wireless environment, high error rates are commonly regarded as the problem of transmission. However, TCP, which is the transport layer protocol used by majority of the applications on the internet, is designed for the wireline network. Therefore, other mechanisms are proposed to solve the transmission problem over the wireless links. RLP first came out in IS-95 in order to recover errors before TCP senses them. However, in third generation cellular system, RLP seems to be inadequate to solve the problem of TCP over wireless links As a result, MAC retransmission is proposed to help TCP performance even more in the order of mega bit per second (Mbps). In this paper, we studied the relationship between MAC retransmission and transmission rate. We found that at very high speed transmission rate (2Mbps), the MAC retransmission performances better than lower rate (0.5Mbps). Besides, we also found that the smaller packet duration is suitable for MAC retransmission.

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