安徽工程大学学报
安徽工程大學學報
안휘공정대학학보
JOURNAL OF ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE(NATURAL SCIENCE)
2015年
2期
66-70
,共5页
退避指数%时隙分配%IEEE 802.15.4%实时性%OPNET
退避指數%時隙分配%IEEE 802.15.4%實時性%OPNET
퇴피지수%시극분배%IEEE 802.15.4%실시성%OPNET
back-off index%time slot allocation%IEEE 802.15.4%real-time performance%OPNET
针对 IEEE 802．15．4协议存在的退避指数范围较窄、缺乏优先级区分服务和时隙分配算法粗糙的不足，融合了基于碰撞感知的二进制退避算法和优先级区分服务，提出一种基于时间敏感的时隙分配算法，用以降低时延、提高系统的自适应性和提高时隙带宽利用率．最终以汽车传感网为应用对象，在 OPNET中验证了所提出的融合改进型协议较原有协议在实时性能等方面的优越性．
針對 IEEE 802．15．4協議存在的退避指數範圍較窄、缺乏優先級區分服務和時隙分配算法粗糙的不足，融閤瞭基于踫撞感知的二進製退避算法和優先級區分服務，提齣一種基于時間敏感的時隙分配算法，用以降低時延、提高繫統的自適應性和提高時隙帶寬利用率．最終以汽車傳感網為應用對象，在 OPNET中驗證瞭所提齣的融閤改進型協議較原有協議在實時性能等方麵的優越性．
침대 IEEE 802．15．4협의존재적퇴피지수범위교착、결핍우선급구분복무화시극분배산법조조적불족，융합료기우팽당감지적이진제퇴피산법화우선급구분복무，제출일충기우시간민감적시극분배산법，용이강저시연、제고계통적자괄응성화제고시극대관이용솔．최종이기차전감망위응용대상，재 OPNET중험증료소제출적융합개진형협의교원유협의재실시성능등방면적우월성．
Aiming at the insufficiency:relatively narrow back-off index range,treating every event fairly and rough time slot allocation algorithm is rough of IEEE 802.15.4 protocol,a priority-based adaptive service-differentiation scheme and a collision-aware back-off mechanism are fused,and then a delay sensi-tive time slot scheduling is proposed in modified protocol to strengthen the adaptive performance of the system,lower the delay and advance the bandwidth utilization respectively.And every proposed scheme is proved theoretically.Finally,the advantage in real-time performance of the proposed modified protocol compared with the original is verified in OPNET by applying it to vehicle wireless sensor network.
