计算机工程与设计
計算機工程與設計
계산궤공정여설계
COMPUTER ENGINEERING AND DESIGN
2015年
2期
311-316,329
,共7页
车载自组织网络%广播协议%十字路口%自适应信标交换%DB-IA
車載自組織網絡%廣播協議%十字路口%自適應信標交換%DB-IA
차재자조직망락%엄파협의%십자로구%자괄응신표교환%DB-IA
vehicular ad hoc network%broadcast protocol%crossroad%adaptive beacon exchange%DB-IA
在分析考虑十字路口的广播协议的基础上，提出一种基于自适应信标交换的方向广播协议DB-IA。通过自适应信标交换机制获取网络拓扑信息，在各路段上选择最远节点转播分组，较大程度上减少广播跳数。采用ACK确认机制，结合双向传输和存储-转发策略缓解网络空洞造成的广播中断问题，提高广播的可靠性。通过设置递增的退避时间控制转播队列，使转播快速、有序完成。仿真结果表明，DB-IA具有相对较好且稳定的性能，适合交通安全类信息传输。
在分析攷慮十字路口的廣播協議的基礎上，提齣一種基于自適應信標交換的方嚮廣播協議DB-IA。通過自適應信標交換機製穫取網絡拓撲信息，在各路段上選擇最遠節點轉播分組，較大程度上減少廣播跳數。採用ACK確認機製，結閤雙嚮傳輸和存儲-轉髮策略緩解網絡空洞造成的廣播中斷問題，提高廣播的可靠性。通過設置遞增的退避時間控製轉播隊列，使轉播快速、有序完成。倣真結果錶明，DB-IA具有相對較好且穩定的性能，適閤交通安全類信息傳輸。
재분석고필십자로구적엄파협의적기출상，제출일충기우자괄응신표교환적방향엄파협의DB-IA。통과자괄응신표교환궤제획취망락탁복신식，재각로단상선택최원절점전파분조，교대정도상감소엄파도수。채용ACK학인궤제，결합쌍향전수화존저-전발책략완해망락공동조성적엄파중단문제，제고엄파적가고성。통과설치체증적퇴피시간공제전파대렬，사전파쾌속、유서완성。방진결과표명，DB-IA구유상대교호차은정적성능，괄합교통안전류신식전수。
A novel directional broadcast considering intersection via adaptive beaconing (DB-IA)based on the analysis of consi-dering crossroads broadcast protocol was proposed.Adaptive beacon exchange mechanism was used to obtain the information of network topology,and node with the longest distance was selected to broadcast packet for each road,greatly reducing broadcast hop.DB-IA adopted acknowledgement (ACK)packets to ensure the reliability of broadcast.The combination of bi-directional propagation and carry-and-forward resolved the problem of network fragment.DB-IA controled the rebroadcast sequence by set-ting incremental backoff counter implicitly,in which way the relay nodes rebroadcasted in a timely and orderly fashion.Simula-tion results indicate that DB-IA performs better on effectiveness and reliability in different scenarios,which means it is suitable for traffic safety messages.
