CAJ | 학술논문

针对VANETs中车辆节点的高速移动性导致网络的拓扑结构频繁变化、通信链路频繁断裂，严重破坏了数据传输的可靠性和稳定性，极大降低了网络性能的情况，提出一种适用于VANETs的QoS分布式协作路由算法（ LETB－AODV算法）。该算法在AODV路由协议的基础上进行扩展，用链路连接失效时间（ LET）和有效带宽来建立双重约束，通过选用最大LET的链路构建最优通信路由路径。仿真结果表明，LETB－AODV协议比AODV协议能够更有效地降低链路断链率、丢包率和路由开销，从而提高通信链路的稳定性，增强网络可靠性。
침대VANETs중차량절점적고속이동성도치망락적탁복결구빈번변화、통신련로빈번단렬，엄중파배료수거전수적가고성화은정성，겁대강저료망락성능적정황，제출일충괄용우VANETs적QoS분포식협작로유산법（ LETB－AODV산법）。해산법재AODV로유협의적기출상진행확전，용련로련접실효시간（ LET）화유효대관래건립쌍중약속，통과선용최대LET적련로구건최우통신로유로경。방진결과표명，LETB－AODV협의비AODV협의능구경유효지강저련로단련솔、주포솔화로유개소，종이제고통신련로적은정성，증강망락가고성。
In VANETs, high-speed mobility of vehicles always lead the network topology to change dynamically and com-munication link to fracture frequently, which severely damaged the reliability and stability of data transmission and greatly re-duced the network performance.In this paper, a kind of distributed cooperative routing algorithm based on QoS ( LETB-AODV routing algorithm) for VANETs was proposed.This protocol, extended from AODV routing protocol, used link expiration time ( LET) and available bandwidth to establish the double constraints, and chose the maximum LET link as the optimal routing path of communication.The simulation results show that the performances of LETB-AODV protocol are better than AODV protocol in packet loss rate, routing overhead, LET, consequently demonstrating the enhancement of path-routing link stability and network reliability with distinct superiority.