计算机应用
計算機應用
계산궤응용
COMPUTER APPLICATION
2010年
2期
309-311,326
,共4页
无线网络%TCP Vegas%往返延时%相对延时%非对称网络
無線網絡%TCP Vegas%往返延時%相對延時%非對稱網絡
무선망락%TCP Vegas%왕반연시%상대연시%비대칭망락
wireless network%TCP Vegas%Round-Trip Time (RTT)%relative delay%asymmetric network
在无线网络环境中,TCP Vegas应用时会受到无线信道干扰和噪声的影响,对往返延时(RTT)难以进行准确的估计,导致其性能大幅度降低.结合TCP New Vegas和TCP Vegas A+等的优点提出一种改进算法TCP Vegas-P.该算法针对慢启动过早结束和拥塞避免阶段拥塞出现在反向链路上导致吞吐量下降的问题,以及在与NewReno共存时公平性恶化的问题进行了综合的改进.经仿真实验,改进的算法在无线网络中能够进行比较好的RTT估计,对解决上述Vegas存在的问题达到了良好的效果.
在無線網絡環境中,TCP Vegas應用時會受到無線信道榦擾和譟聲的影響,對往返延時(RTT)難以進行準確的估計,導緻其性能大幅度降低.結閤TCP New Vegas和TCP Vegas A+等的優點提齣一種改進算法TCP Vegas-P.該算法針對慢啟動過早結束和擁塞避免階段擁塞齣現在反嚮鏈路上導緻吞吐量下降的問題,以及在與NewReno共存時公平性噁化的問題進行瞭綜閤的改進.經倣真實驗,改進的算法在無線網絡中能夠進行比較好的RTT估計,對解決上述Vegas存在的問題達到瞭良好的效果.
재무선망락배경중,TCP Vegas응용시회수도무선신도간우화조성적영향,대왕반연시(RTT)난이진행준학적고계,도치기성능대폭도강저.결합TCP New Vegas화TCP Vegas A+등적우점제출일충개진산법TCP Vegas-P.해산법침대만계동과조결속화옹새피면계단옹새출현재반향련로상도치탄토량하강적문제,이급재여NewReno공존시공평성악화적문제진행료종합적개진.경방진실험,개진적산법재무선망락중능구진행비교호적RTT고계,대해결상술Vegas존재적문제체도료량호적효과.
In wireless network, channel interference and noise cause significant performance degradation of TCP. In order to solve the problems existing in the application of TCP Vegas, based on TCP New Vegas algorithm, combining the advantages of TCP Vegas A+ algorithm, an improved algorithm named TCP Vegas-P was proposed. It was improved to solve the premature end of the slow start phase and congestion avoidance in the reverse link congestion resulting in the throughput decline, and the fairness deterioration when it was accompanied by NewReno. The simulation results show that the improved algorithm in the wireless network can better estimate Round-Trip Time (RTT), and resolve the problems about Vegas, and can be well applied to wireless network environment.