南京理工大学学报（自然科学版）
南京理工大學學報（自然科學版）
남경리공대학학보（자연과학판）
JOURNAL OF NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
2014年
4期
506-511
,共6页
无线局域网%二进制指数退避%竞争窗口%两段%媒体访问控制%冲突
無線跼域網%二進製指數退避%競爭窗口%兩段%媒體訪問控製%遲突
무선국역망%이진제지수퇴피%경쟁창구%량단%매체방문공제%충돌
WLAN%binary exponential backoff%contention window%two-stage%media access control%collision
为了克服IEEE 802.11网络二进制指数退避(Binary exponential backoff,BEB)算法竞争窗口振荡等问题,提出了β-坚持二进制指数两段退避(β-persistent binary exponential backoff,β-BEB)算法。建立Markov状态转换模型比较β-BEB和BEB的延时与吞吐量,并进行仿真验证；探讨β值的自适应计算与优化设置复位窗口( CWmid ),提高系统的吞吐量与延时方面性能。分析与仿真结果表明,高密度高负载的网络环境中β-BEB比BEB在平均延时与吞吐量方面均有提高。
為瞭剋服IEEE 802.11網絡二進製指數退避(Binary exponential backoff,BEB)算法競爭窗口振盪等問題,提齣瞭β-堅持二進製指數兩段退避(β-persistent binary exponential backoff,β-BEB)算法。建立Markov狀態轉換模型比較β-BEB和BEB的延時與吞吐量,併進行倣真驗證；探討β值的自適應計算與優化設置複位窗口( CWmid ),提高繫統的吞吐量與延時方麵性能。分析與倣真結果錶明,高密度高負載的網絡環境中β-BEB比BEB在平均延時與吞吐量方麵均有提高。
위료극복IEEE 802.11망락이진제지수퇴피(Binary exponential backoff,BEB)산법경쟁창구진탕등문제,제출료β-견지이진제지수량단퇴피(β-persistent binary exponential backoff,β-BEB)산법。건립Markov상태전환모형비교β-BEB화BEB적연시여탄토량,병진행방진험증；탐토β치적자괄응계산여우화설치복위창구( CWmid ),제고계통적탄토량여연시방면성능。분석여방진결과표명,고밀도고부재적망락배경중β-BEB비BEB재평균연시여탄토량방면균유제고。
To overcome the oscillation problem of the IEEE 802 . 11 network binary exponential backoff( BEB ) algorithm,β-persistent binary exponential two-stage backoff (β-BEB ) algorithm is proposed. This paper formulates a Markov state transition model to compare throughput and delay performance of the two β-BEB/BEB algorithms, and the results are validated by simulations. We optimize the value of CWmid and adaptively compute the value of β to improve the system throughput and delay performance. Analysis and simulation results show that the β-BEB significantly enhances the throughput and reduces the average packet delay in the high density and high-load networks.
