Heterogeneous vehicular networks (HetVNETs) are regarded as a promising technique for meeting various requirements of intelli- gent transportation system (ITS) services. With the rapid development of mobile Intern...Heterogeneous vehicular networks (HetVNETs) are regarded as a promising technique for meeting various requirements of intelli- gent transportation system (ITS) services. With the rapid development of mobile Internet in the past decade, social networks (SNs) have become an indispensable part of human life. Based on this indivisible relationship between vehicles and users, social charac- teristics and human behaviors can significantly affect vehicular network performance. Hence, we firstly present two architectures for SNs by introducing social characteristics into the HetVNETs. Then, several user cases are also given in this paper, in which service requirements are analyzed simultaneously. At last, we briefly discuss potential challenges raised by the HetVNETs for SNs.展开更多
Vehicular Social Networks(VSNs)is the bridge of social networks and Vehicular Ad-Hoc Networks(VANETs).VSNs are promising as they allow the exchange of various types of contents in large-scale through Vehicle-to-Vehicl...Vehicular Social Networks(VSNs)is the bridge of social networks and Vehicular Ad-Hoc Networks(VANETs).VSNs are promising as they allow the exchange of various types of contents in large-scale through Vehicle-to-Vehicle(V2V)and Vehicle-to-Infrastructure(V2I)communication protocols.Vehicular Named Data Networking(VNDN)is an auspicious communication paradigm for the challenging VSN environment since it can optimize content dissemination by decoupling contents from their physical locations.However,content dissemination and caching represent crucial challenges in VSNs due to short link lifetime and intermittent connectivity caused by vehicles’high mobility.Our aim with this paper is to improve content delivery and cache hit ratio,as well as decrease the transmission delay between end-users.In this regard,we propose a novel hybrid VNDN-VSN forwarding technique based on social communities,which allows requester vehicles to easily find the most suitable forwarder or producer among the community members in their neighborhood area.Furthermore,we introduce an effective caching mechanism by dividing the content store into two parts,one for community private contents and the second one for public contents.Simulation results show that our proposed forwarding technique can achieve a favorable performance compared with traditional VNDN,in terms of data delivery ratio,average data delivery delay,and cache hit ratio.展开更多
在车载社交网(Vehicular Social Network,VSN)中,车辆移动速度快且行驶方向难以预测,导致网络拓扑结构不断变化,通信链路时常中断,因此在进行消息传输时丢失率和传输延迟都居高不下。为了解决上述问题,针对VSN提出了一种基于传递概率的...在车载社交网(Vehicular Social Network,VSN)中,车辆移动速度快且行驶方向难以预测,导致网络拓扑结构不断变化,通信链路时常中断,因此在进行消息传输时丢失率和传输延迟都居高不下。为了解决上述问题,针对VSN提出了一种基于传递概率的路由算法(ProSim),利用节点间的机会式相遇来进行消息的传输,根据车辆间的社交关系设计VSN路由算法以弥补通信链路中断带来的高丢失率和高延迟;选取了车辆节点的相遇概率和社会相似度这两种社交关系,对其进行量化并计算传递概率。使用真实的道路数据进行仿真,实验结果表明,ProSim与直接传输算法(Direct Delivery,DD)、Epidemic算法以及PRoPHET算法这3种经典路由算法相比,可以在控制传输开销和传输延迟的前提下,有效提高消息的传输率。展开更多
为满足车载社交网络(Vehicular Social Network,VSN)中用户对视频等多媒体内容的需求,基于内容中心网络(Information-Centric Networking,ICN)架构,提出一种内容中心型VSN路由机制(Content-centric routing scheme in VSN,CVSN)。在CVSN...为满足车载社交网络(Vehicular Social Network,VSN)中用户对视频等多媒体内容的需求,基于内容中心网络(Information-Centric Networking,ICN)架构,提出一种内容中心型VSN路由机制(Content-centric routing scheme in VSN,CVSN)。在CVSN中,兴趣路由根据车辆节点的相似内容存储选择兴趣包转发节点;数据路由根据车辆节点间的同行率选择数据包转发节点。同时,基于VSN用户的兴趣偏好进行内容的网络内缓存管理,在缓存达到上限时,首先丢弃用户兴趣偏好低的内容。基于公交车应用场景对所提出的路由机制进行了仿真实验,通过与现有机制在包交付率、平均延迟、平均跳数和网络开销方面的性能对比表明了文中提出的机制是可行且有效的。展开更多
为提高车载自组织网络(vehicular Ad hoc networks,VANETs)中消息投递的效率,提出了一种社会感知多副本车载自组织网络机会路由协议(SAMOR)。协议结合了车载自组织网络中节点的社会性特点和多副本路由方案的优势,采用携带—存储—转发...为提高车载自组织网络(vehicular Ad hoc networks,VANETs)中消息投递的效率,提出了一种社会感知多副本车载自组织网络机会路由协议(SAMOR)。协议结合了车载自组织网络中节点的社会性特点和多副本路由方案的优势,采用携带—存储—转发的机会路由方式进行消息投递。利用节点间的相遇历史区分社区节点和全局节点,并使用所提出的节点社区中心性和网络中心性的度量方法,得到了节点的效用。在路由过程的扩散阶段,节点间按效用分配副本,在转发阶段,副本继续向效用高的节点转发。仿真结果表明,SAMOR实现了较高的消息投递成功率和较低的延迟。展开更多
为保证车载自组织网络(VANET)消息转发效率,提出一种基于任务分配模型的路由算法。根据社会网络中节点特性划分社区,采用协商机制将紧急安全与非安全消息任务分配到不同社区,由社区再分配到节点,并建立奖惩机制提高消息任务分发效率。...为保证车载自组织网络(VANET)消息转发效率,提出一种基于任务分配模型的路由算法。根据社会网络中节点特性划分社区,采用协商机制将紧急安全与非安全消息任务分配到不同社区,由社区再分配到节点,并建立奖惩机制提高消息任务分发效率。理论分析和仿真结果表明,与Simbet,Prophet和Spray and Wait路由算法相比,该算法具有较高的消息包投递率及较低的路由开销,并且能满足不同类别消息任务的服务质量需求。展开更多
出租车的GPS轨迹数据在发展智慧交通方面有很大的潜力。通过分析这些数据可以发现车辆之间存在的社会关系或属性,而这些发掘出来的信息对于设计出性能更优的VANETs路由算法可以进行更好的指导。通过对GPS轨迹数据进行分析,获得了车辆节...出租车的GPS轨迹数据在发展智慧交通方面有很大的潜力。通过分析这些数据可以发现车辆之间存在的社会关系或属性,而这些发掘出来的信息对于设计出性能更优的VANETs路由算法可以进行更好的指导。通过对GPS轨迹数据进行分析,获得了车辆节点的中心性和偏好活动区域;依据节点的这些属性,设计了基于中心性的路由和基于偏好性的路由,并进一步设计了同时考虑两者的路由,即TDSAR(Trace Data’s Social Attribute Routing,基于真实轨迹社会属性的路由);最后借助ONE作为平台,模拟路由算法并对算法的性能进行了评价。实验结果表明,在测试场景下,TDSAR算法可以在保持较小开销并保证传输延时不提高的前提下,获得较高的投递成功率。通过深入的挖掘车辆间的社会关系,有助于更好地选择中继节点,从而促进VANETs的发展。展开更多
基金supported in part by National Science Foundation of China(No.61331009)National Key Technology R&D Program of China(No.2015ZX03002009-004)
文摘Heterogeneous vehicular networks (HetVNETs) are regarded as a promising technique for meeting various requirements of intelli- gent transportation system (ITS) services. With the rapid development of mobile Internet in the past decade, social networks (SNs) have become an indispensable part of human life. Based on this indivisible relationship between vehicles and users, social charac- teristics and human behaviors can significantly affect vehicular network performance. Hence, we firstly present two architectures for SNs by introducing social characteristics into the HetVNETs. Then, several user cases are also given in this paper, in which service requirements are analyzed simultaneously. At last, we briefly discuss potential challenges raised by the HetVNETs for SNs.
文摘Vehicular Social Networks(VSNs)is the bridge of social networks and Vehicular Ad-Hoc Networks(VANETs).VSNs are promising as they allow the exchange of various types of contents in large-scale through Vehicle-to-Vehicle(V2V)and Vehicle-to-Infrastructure(V2I)communication protocols.Vehicular Named Data Networking(VNDN)is an auspicious communication paradigm for the challenging VSN environment since it can optimize content dissemination by decoupling contents from their physical locations.However,content dissemination and caching represent crucial challenges in VSNs due to short link lifetime and intermittent connectivity caused by vehicles’high mobility.Our aim with this paper is to improve content delivery and cache hit ratio,as well as decrease the transmission delay between end-users.In this regard,we propose a novel hybrid VNDN-VSN forwarding technique based on social communities,which allows requester vehicles to easily find the most suitable forwarder or producer among the community members in their neighborhood area.Furthermore,we introduce an effective caching mechanism by dividing the content store into two parts,one for community private contents and the second one for public contents.Simulation results show that our proposed forwarding technique can achieve a favorable performance compared with traditional VNDN,in terms of data delivery ratio,average data delivery delay,and cache hit ratio.
文摘在车载社交网(Vehicular Social Network,VSN)中,车辆移动速度快且行驶方向难以预测,导致网络拓扑结构不断变化,通信链路时常中断,因此在进行消息传输时丢失率和传输延迟都居高不下。为了解决上述问题,针对VSN提出了一种基于传递概率的路由算法(ProSim),利用节点间的机会式相遇来进行消息的传输,根据车辆间的社交关系设计VSN路由算法以弥补通信链路中断带来的高丢失率和高延迟;选取了车辆节点的相遇概率和社会相似度这两种社交关系,对其进行量化并计算传递概率。使用真实的道路数据进行仿真,实验结果表明,ProSim与直接传输算法(Direct Delivery,DD)、Epidemic算法以及PRoPHET算法这3种经典路由算法相比,可以在控制传输开销和传输延迟的前提下,有效提高消息的传输率。
文摘为满足车载社交网络(Vehicular Social Network,VSN)中用户对视频等多媒体内容的需求,基于内容中心网络(Information-Centric Networking,ICN)架构,提出一种内容中心型VSN路由机制(Content-centric routing scheme in VSN,CVSN)。在CVSN中,兴趣路由根据车辆节点的相似内容存储选择兴趣包转发节点;数据路由根据车辆节点间的同行率选择数据包转发节点。同时,基于VSN用户的兴趣偏好进行内容的网络内缓存管理,在缓存达到上限时,首先丢弃用户兴趣偏好低的内容。基于公交车应用场景对所提出的路由机制进行了仿真实验,通过与现有机制在包交付率、平均延迟、平均跳数和网络开销方面的性能对比表明了文中提出的机制是可行且有效的。
文摘为提高车载自组织网络(vehicular Ad hoc networks,VANETs)中消息投递的效率,提出了一种社会感知多副本车载自组织网络机会路由协议(SAMOR)。协议结合了车载自组织网络中节点的社会性特点和多副本路由方案的优势,采用携带—存储—转发的机会路由方式进行消息投递。利用节点间的相遇历史区分社区节点和全局节点,并使用所提出的节点社区中心性和网络中心性的度量方法,得到了节点的效用。在路由过程的扩散阶段,节点间按效用分配副本,在转发阶段,副本继续向效用高的节点转发。仿真结果表明,SAMOR实现了较高的消息投递成功率和较低的延迟。
文摘为保证车载自组织网络(VANET)消息转发效率,提出一种基于任务分配模型的路由算法。根据社会网络中节点特性划分社区,采用协商机制将紧急安全与非安全消息任务分配到不同社区,由社区再分配到节点,并建立奖惩机制提高消息任务分发效率。理论分析和仿真结果表明,与Simbet,Prophet和Spray and Wait路由算法相比,该算法具有较高的消息包投递率及较低的路由开销,并且能满足不同类别消息任务的服务质量需求。
文摘出租车的GPS轨迹数据在发展智慧交通方面有很大的潜力。通过分析这些数据可以发现车辆之间存在的社会关系或属性,而这些发掘出来的信息对于设计出性能更优的VANETs路由算法可以进行更好的指导。通过对GPS轨迹数据进行分析,获得了车辆节点的中心性和偏好活动区域;依据节点的这些属性,设计了基于中心性的路由和基于偏好性的路由,并进一步设计了同时考虑两者的路由,即TDSAR(Trace Data’s Social Attribute Routing,基于真实轨迹社会属性的路由);最后借助ONE作为平台,模拟路由算法并对算法的性能进行了评价。实验结果表明,在测试场景下,TDSAR算法可以在保持较小开销并保证传输延时不提高的前提下,获得较高的投递成功率。通过深入的挖掘车辆间的社会关系,有助于更好地选择中继节点,从而促进VANETs的发展。