Analysis and simulation results show that , compared with the ieee802 . 11 binary exponential backoff ( beb ) algorithm and other algorithms that have been employed to address the fairness problem , the proposed qbwf algorithm is simpler and practical . also , by choosing appropriate parameters , the qbwf algorithm can effectively improve the channel access fairness and achieve a preferable trade - off between fairness and throughput 分析與仿真結(jié)果表明,與ieee802 . 11標(biāo)準(zhǔn)的二進(jìn)制指數(shù)退避( beb )算法和其它改善信道接入公平性的算法相比,本文算法更為簡單實(shí)用,且對于合適的參數(shù)取值,本文算法能有效地改善信道接入的不公平性,并能在信道吞吐量的下降和信道接入公平性的改善之間達(dá)到一個(gè)較好的折衷。
Simulation is operated with ns2 under linux , and the simulation results show that , the presented algorithm is simpler and more practical , while it can improve the fairness index of ad hoc network to a large extent compared with the ieee802 . 11 binary exponential backoff ( beb ) algorithm . it can make better use of the wireless channel by dynamically adjusting its backoff timer according to the network ' s contest situation . in addition , service differentiation can be achieved among flows with different qos requirements and thus the qos for medium access control in ad hoc network is improved 通過在linux系統(tǒng)下利用networksimulator ( ns2 )仿真工具對算法進(jìn)行計(jì)算機(jī)仿真分析,結(jié)果表明,與ieee802 . 11標(biāo)準(zhǔn)采用的二進(jìn)制指數(shù)退避( beb )算法相比,該文所提算法更簡單、高效,它能在很大程度上提高adhoc網(wǎng)絡(luò)信道接入的公平性,并能動(dòng)態(tài)地提供服務(wù)區(qū)分,保障對多媒體等多種實(shí)時(shí)業(yè)務(wù)的傳輸需求,同時(shí),算法可以根據(jù)網(wǎng)絡(luò)當(dāng)前具體的競爭激烈情況,動(dòng)態(tài)調(diào)整退避時(shí)間值,從而提高信道的利用率。