解決在間歇性高速率毫米波連線下暫存器膨脹的問題

Abstract

由於在毫米波頻段有大量可以用的頻譜資源，在這個頻段的行動通信系統可以提供比傳統較低頻段網路更大數量級的頻寬。然而，由於毫米波極易被阻擋，因此連線品質會極其斷斷續續。高傳輸速率和間歇性這兩個特性的結合導致暫存器膨脹的挑戰性問題。暫存器膨脹是一種在網路中過大的資料量塞滿暫存器而導致傳輸延遲的現象。雖然已經有一些在 3G/4G 行動網路環境下解決暫存器膨脹的研究，但是這些解決方法在 5G 毫米波連線下可能有些缺陷。因此我們提出一個動態調整接收窗口的機制來調控接收窗口。從我們的模擬結果可以得知，相較於其他演算法，我們的演算法可以在 5G 毫米波連線下達到最大傳輸速率以及降低延遲以解決暫存器膨脹問題。

Due to massive available spectrum in the millimeter wave (mmWave) bands, cellular systems in these frequencies could provide orders of magnitude capacity than networks in conventional lower frequency bands. However, due to high susceptibility to blocking, mmWave links can be extremely intermittent in quality. This combination of high peak throughputs and intermittency can cause challenging problem of bufferbloat. Bufferbloat is a phenomenon triggered by oversized filled or full buffers in the network and usually results in high latency. Although there has been some research for solving bufferbloat problem in 3G/4G mobile network, these solutions may have some drawbacks over 5G mmWave links. Therefore, we proposed a dynamic receive window adjustment scheme to dynamically adjust the receive window. From our simulation results, comparing to other algorithms, our algorithm can maximize the throughput and reduce the latency over 5G mmWave links to solve bufferbloat problem.