無線網(wǎng)絡(luò)中實時業(yè)務(wù)的隨機超時早檢測緩存管理算法
A Random Early Expiration Detection Based Buffer Management Algorithm for Real-Time Traffic over Wireless Networks
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摘要: 該文提出一種適用于無線網(wǎng)絡(luò)中實時業(yè)務(wù)的隨機超時早檢測緩存管理算法。考慮到無線網(wǎng)絡(luò)具有動態(tài)變化的信道條件和存在傳輸錯誤等特點，算法分為3個層次：以保證重傳分組不超時為目標(biāo)，采用類似于擁塞早檢測的方法對超時進行早期檢測和隨機丟棄；根據(jù)信道條件的變化趨勢對丟棄概率進行自適應(yīng)調(diào)節(jié)；根據(jù)信道速率的變化對門限值進行調(diào)整。在算法設(shè)計時，同時兼顧了分組丟棄對TCP性能的影響。仿真表明，采用該算法后，系統(tǒng)性能得到改善。
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關(guān)鍵詞:
- 無線網(wǎng)絡(luò);緩存管理;服務(wù)質(zhì)量;信道條件;TCP
Abstract: A random early expiration detection based buffer management algorithm is proposed for real-time traffic over wireless networks. Considering the characters of wireless link such as variable channel condition and transmission error, the algorithm is composed of three steps: aimed to guarantee the delay of retransmission packets, using the method which is similar to early congestion detection to detect expiration and discard packets in advance; adaptive adjusting the drop probability based on the trend of channel condition; re-calculating the threshold value when the link rate is changed. The influence on the TCP performance is also considered in the design. Simulation results show that the system performance is improved through using the proposed algorithm. -
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