计算机应用与软件
計算機應用與軟件
계산궤응용여연건
COMPUTER APPLICATIONS AND SOFTWARE
2015年
6期
136-139
,共4页
无线传感器网络%拥塞控制%信道繁忙比率%误码率
無線傳感器網絡%擁塞控製%信道繁忙比率%誤碼率
무선전감기망락%옹새공제%신도번망비솔%오마솔
Wireless sensor networks (WSN)%Congestion control%Channel busyness ratio%Bit error rate
由于 WSN 具有链路质量差、数据冗余度高和“多对一”汇聚等特性，使得传统 TCP 协议的应用受到了挑战。为此，基于数据报传输协议（DCCP）提出一种改进的拥塞控制机制 IM＿DCCP。IM＿DCCP 根据误码丢包率来区分链路误码和网络拥塞引发的丢包，同时引入信道繁忙比率来协作进行网络拥塞检测，并针对不同的拥塞等级选择正确的窗口调节策略实施拥塞控制。NS2仿真表明，所提出的机制与其他机制比较，公平性较好，且能有效的降低丢包率、提高网络吞吐量性能。
由于 WSN 具有鏈路質量差、數據冗餘度高和“多對一”彙聚等特性，使得傳統 TCP 協議的應用受到瞭挑戰。為此，基于數據報傳輸協議（DCCP）提齣一種改進的擁塞控製機製 IM＿DCCP。IM＿DCCP 根據誤碼丟包率來區分鏈路誤碼和網絡擁塞引髮的丟包，同時引入信道繁忙比率來協作進行網絡擁塞檢測，併針對不同的擁塞等級選擇正確的窗口調節策略實施擁塞控製。NS2倣真錶明，所提齣的機製與其他機製比較，公平性較好，且能有效的降低丟包率、提高網絡吞吐量性能。
유우 WSN 구유련로질량차、수거용여도고화“다대일”회취등특성，사득전통 TCP 협의적응용수도료도전。위차，기우수거보전수협의（DCCP）제출일충개진적옹새공제궤제 IM＿DCCP。IM＿DCCP 근거오마주포솔래구분련로오마화망락옹새인발적주포，동시인입신도번망비솔래협작진행망락옹새검측，병침대불동적옹새등급선택정학적창구조절책략실시옹새공제。NS2방진표명，소제출적궤제여기타궤제비교，공평성교호，차능유효적강저주포솔、제고망락탄토량성능。
The application of traditional TCP is a challenging work due to WSN has the characteristics of poor quality of link,high redun-dancy of data and “many-to-one”gathering.This paper presents an improved congestion control mechanism based on the datagram congestion control protocol (DCCP),namely the IM_DCCP.The new mechanism differentiates the packet loss triggered by either link bit errors or net-work congestion according to errors packet loss rate.At the same time,it introduces the channel busyness ratio to collaborative detection of network congestion,and selects proper window adjustment strategy to implement congestion control in light of different congestion status.It is demonstrated by NS2 simulation that comparing with other mechanisms,the proposed mechanism has good fairness and can effectively reduce packet loss rate as well as improve network throughput performance.
