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您的检索式：作者名="Weisen Shi"
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| 1 | Internet of Vehicles in Big Data Era显示文摘As the rapid development of automotive telematics,modern vehicles are expected to be connected through heterogeneous radio access technologies and are able to exchange massive information with their surrounding environment. By significantly expanding the network scale and conducting both real-time and long-term information processing, the traditional Vehicular AdHoc Networks(VANETs) are evolving to the Internet of Vehicles(Io V), which promises efficient and intelligent prospect for the future transportation system. On the other hand, vehicles are not only consuming but also generating a huge amount and enormous types of data, which is referred to as Big Data. In this article, we first investigate the relationship between Io V and big data in vehicular environment, mainly on how Io V supports the transmission, storage, computing of the big data, and how Io V benefits from big data in terms of Io V characterization,performance evaluation and big data assisted communication protocol design. We then investigate the application of Io V big data in autonomous vehicles. Finally, the emerging issues of the big data enabled Io V are discussed. | Wenchao Xu Haibo Zhou Nan Cheng Feng Lyu Weisen Shi Jiayin Chen Xuemin (Sherman) Shen | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，1： | 19 |
| 2 | Transmission Capacity Analysis for Linear VANET under Physical Model显示文摘In this study, the transmission capacity of VANETs in a highway scenario is analysed on the basis of a 1D line model and the carrier sense multiple access with collision avoidance(CSMA/CA) protocol. We describe the CSMA/CA protocol used in IEEE802.11 p from the perspective of the geometric relationship amongst simultaneous transmitters. The desired channel and interfering channels are assumed to experience the same amount of path-loss and Rayleigh fading. On the basis of the proposed model, we analyse the attempted transmission probability of each road segment and the maximum intensity of active transmitters, including their theoretical values. Then, we employ the physical model to obtain the outage probability and derive the upper bound of the transmission capacity of a VANET, which is defined as the average spatial density of successful transmissions in the network. Simulation results indicate that the theoretical value offers a good bound on network capacity. | Xinxin He Hang Zhang Weisen Shi Tao Luo Norman C.Beaulieu | 2017 | China Communications2017，14，3： | 1 |
| 3 | Network capacity analysis for cellular based cognitive radio VANET in urban grid scenario显示文摘The spectrum scarcity of VANETs(Vehicular Ad hoc Networks)can be alleviated by spectrum sharing technology.We present a framework of CCR-VANETs(Cellular-based Cognitive-radio Vehicular Ad hoc Networks).In CCR-VANETs,cellular network performs as primary network while VANET shares the downlink spectrum of cellular network.We consider a scalable urban grid scenario in which vehicles detect available spectrum holes and opportunistically access them according to a carrier-sensing multiple-access protocol.To restrict vehicles'interference to primary receivers,we set a square preservation region around each particular street block where an active base station is located.The number of street blocks in the preservation region is calculated with the practical assumption that vehicles only know the locations of primary transmitters.We analyze the aggregate interference power from primary and secondary networks,then derive the lower-bound of downlink capacity for the primary network and lower-bound of V2V(Vehicle-to-Vehicle)channel capacity for the secondary network respectively.The numerical results demonstrate the impacts of di erent network parameters on inter-networks interference level and network capacities. | Xinxin He Hang Zhang Tao Luo Weisen Shi | 2017 | Journal of Communications and Information Networks2017，2，2： | 1 |
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