计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
13期
103-108
,共6页
交叉路口%位置路由%交通信息%车辆自组织网
交扠路口%位置路由%交通信息%車輛自組織網
교차로구%위치로유%교통신식%차량자조직망
junction%geographic routing%traffic information%Vehicle Ad hoc Networks(VANETs)
由于车载网（VANETs）节点的快速移动以及动态的拓扑结构，传统的无线自组织路由协议难于直接应用于VANETs。许多路由协议利用交通信息作为决策最优路径的参数，但是，目前收集实时交通信息的机制效率不高。为此，提出混合式的交通信息的路由协议HTAR。混合式的交通信息包含节点密度以及网络流量负载。大多数路由协议都忽略了网络流量负载信息，在高负载网络流量时，这将导致路由性能剧速下降。在HTAR中，位于交叉路口的节点根据采集实时的交通信息选择路径，该路径由一系列的交叉路口组成。两交叉路口间的路径采用地理转发策略，通过选择节点转发数据。仿真结果表明，与传统的地理位置路由协议相比，所提出的HTAR方案的数据传输率、网络吞吐量性能均有较大的提高。
由于車載網（VANETs）節點的快速移動以及動態的拓撲結構，傳統的無線自組織路由協議難于直接應用于VANETs。許多路由協議利用交通信息作為決策最優路徑的參數，但是，目前收集實時交通信息的機製效率不高。為此，提齣混閤式的交通信息的路由協議HTAR。混閤式的交通信息包含節點密度以及網絡流量負載。大多數路由協議都忽略瞭網絡流量負載信息，在高負載網絡流量時，這將導緻路由性能劇速下降。在HTAR中，位于交扠路口的節點根據採集實時的交通信息選擇路徑，該路徑由一繫列的交扠路口組成。兩交扠路口間的路徑採用地理轉髮策略，通過選擇節點轉髮數據。倣真結果錶明，與傳統的地理位置路由協議相比，所提齣的HTAR方案的數據傳輸率、網絡吞吐量性能均有較大的提高。
유우차재망（VANETs）절점적쾌속이동이급동태적탁복결구，전통적무선자조직로유협의난우직접응용우VANETs。허다로유협의이용교통신식작위결책최우로경적삼수，단시，목전수집실시교통신식적궤제효솔불고。위차，제출혼합식적교통신식적로유협의HTAR。혼합식적교통신식포함절점밀도이급망락류량부재。대다수로유협의도홀략료망락류량부재신식，재고부재망락류량시，저장도치로유성능극속하강。재HTAR중，위우교차로구적절점근거채집실시적교통신식선택로경，해로경유일계렬적교차로구조성。량교차로구간적로경채용지리전발책략，통과선택절점전발수거。방진결과표명，여전통적지리위치로유협의상비，소제출적HTAR방안적수거전수솔、망락탄토량성능균유교대적제고。
Due to the high dynamic of topology and high mobile of nodes in VANETs(Vehicular Ad hoc Networks), Traditional Ad hoc routing protocol is difficult to directly apply in VANETs. Many routing protocols utilize vehicular traffic information as a metric to determine optimal routing paths to transmit data in vehicular environment. The existing traffic information collection mechanisms can not provide the efficiency that is needed for the VANETs environment. Therefore, the HTAR(Hybrid Traffic-Aware Routing Protocol)is proposed. In HTAR, hybrid traffic information includes node density and network traffic load. In most VANET routing protocols, the network traffic load is always ignored and this action may cause network performance degradation in heavy traffic load networks. A forwarding node at a junction adaptively decides on a routing path based on the real-time hybrid traffic information. It consists of successions of road junctions to find the destination node for the data packet. Between two consecutive junctions on the path, geographical forwarding is used to select forwarding nodes on the road. Compared with traditional geographic routing, simulation results show that significant performance improvement has been achieved in terms of packet delivery ratio, network throughput.
