Vehicular Netwoorrkkss

?Jiannong Cao

Vehicular Netwoorrkkss

?Jiannong Cao

Jiannong Cao is currently a chair professor and head of the Depart?ment of Computing at Hong Kong Polytechnic University.He received his BSc degree in computer science from Nanjing University，China，in 1982.He received his MSc and PhD degrees in computer science from Washington State University in 1986 and 1990.His research inter?ests include parallel and distributed computing，computer networks，mobile and pervasive computing，fault tolerance，and middleware.He has co?authored four books，co?edited nine books，and published more than 300 technical papers in major international journals and conference proceed?ings.He has directed and participated in numerous re?search and development projects and，as a principal inves?tigator，obtained more than HK$25 million in grants.He is the chair of Technical Committee on Distributed Comput?ing，IEEE Computer Society;a senior member of IEEE;a member of ACM;and a senior member of China Computer Federation.He has been an associate editor and member of editorial boards of many international journals.He has been the chair and a member of organizing/program com?mittees for many international conferences.

V ehicular networks have attracted a lot of attention in recent years.Many projects have been initiated by government，industry，and academia to improve driving safety，provide travel assistance，improve traffic flow，and decrease fuel consumption.These projects exploit vehicular com?munications and networking technologies，generally referred to as vehicular ad?hoc networks(VANETs)or more generally，vehicular networks.VANET includes vehicle?to?infrastructure and vehicle?to?vehicle communications and can be based on short?range and medium?range communication as well as cellular systems.The develop?ment and deployment of vehicular networks is also considered one of the critical foundations of the intelligent transportation system industry.

The purpose of this special issue is to explore recent developments in VANETs and stimulate discussion on future research on large?scaled VANET applications. This special issue comprises six papers covering the most active areas of research in VANETs.Three papers are dedicated to network communication protocols.Re?spectively，these papers describe network coding，QoS in V2I communications，and data routing schemes.Another two papers focus on novel VANET applications and services.One of these papers proposes real?time routing and the other proposes net?work?enhanced GPS techniques.The last paper describes a practical prototype vehi?cle system comprising connected vehicles.

The first paper by Yuanguo Bi et al.describes the problem of satisfying the di?verse QoS requirements of various vehicular applications and efficiently utilizing limited wireless channel resources.The authors propose a cross?layer rate?control scheme to solve this problem.By tracking throughput，aggregate arrival rate，and buffer size at the bottleneck RSU in a timely manner，source sending rates can be adjusted in order to avoid buffer overflow or underflow at the RSU.In addition，bandwidth can be efficiently allocated to different types of multimedia services by taking the bandwidth requirements of each service into account.Simulation results show that this solution improves system throughput and ensures wireless channel re?sources are efficiently used.This solution also satisfies the different QoS require?ments of multimedia services in V2I networks.

The second paper“Advanced Leader Election for Virtual Traffic Lights”de?scribes a novel vehicular networking application called Virtual Traffic Light(VTL). This solution replaces current infrastructure?based traffic lights.The authors pres?ent the results of an evaluation of an improved VTL system designed to manage arbi?trary intersection geometries.The effect of VTL on traffic flow and overall network performance is determined for two scenarios:a realistic urban road network and a synthetic single intersection.The results show that VTL positively affects the driv?ing experience of simulated vehicles.

The third paper“Trajectory?Based Data Forwarding Schemes for Vehicular Net?works”describes two data?forwarding schemes based on vehicle trajectory in VANETs.Vehicle trajectory is a good asset when designing data?forwarding schemes for multihop V2I or I2V data delivery because it allows for either a better forwarding metric computation or better estimation of the location of the packet des?tination vehicle.

The paper“Unveiling the Challenges for Improving Data Availability in Vehicu?

lar Networks with Network Coding”describes a network?coding?based approach for improving data availability in VANETs. An empirical study with trace?driven simulations shows that performance can be significantly improved，but codes received by a retrieving node tend to be linearly correlated.This is a se?rious issue because linear correlation of codes degrades data retrieval.The authors show this by designing synthetic net?works that have community structures with dramatically differ?ent features and conducting experiments on these networks. The authors also discuss opportunities for improving network?coding?based approach for data availability in vehicular net?work by developing community?aware techniques for codes dis?tribution.

The paper“Networking?GPS:Cooperative Vehicle Localiza?tion Using Commodity GPS in Urban Area”describes a new co?operative vehicle localization algorithm called Networking?GPS.The objective of this algorithm is to mitigate the multipa?th effect，which can severely degrade the localization perfor?mance of GPS receivers.The correlation between the similarity of SNR values from different GPS satellites and relative dis?tance among different GPS receivers is identified.An evalua? tion based on real GPS traces shows that Networking?GPS can improve accuracy in the face of the multipath effect.

Finally，the paper“Anatomy of Connected Cars”describes the Internet of Vehicles，which is poised to become a reality as connected vehicles are mandated by the US Department of Transportation.This paper identifies the main characteristics of IoV information flow and two roadblocks to IoV deployment. The authors argue exploitation of community WiFi connectivity and shifting from a node?centric paradigm to a content?centric paradigm can accelerate IoV deployment and reduce costs.

The papers in this special issue are a snapshot of current is?sues in the field of VANETs.Large?scale VANET application is still in its infancy，and much current work focuses on the de?velopment of applications.There is a gap between the deploy?ment of VANET applications and the existing vehicular com?munication protocols.The papers in this special issue show how that gap is closing.

We are grateful to all authors who submitted their papers for publication in this special issue.We thank Zongjian He，a PhD student at Hong Kong Polytechnic University for his great effort and enthusiastic support for this special issue.

ZTE CommunicationsCall for Papers

Special Issue on

Using Artificial Intelligence in Internet of Things

Guest Editors:Fuji Ren,Yu Gu

Internet of Things has received much attention over the past de?cade.With the rapid increase in the use of smart devices，we are now able to collect big data on a daily basis.The data we are gather?ing and related problems are becoming more complex and uncer?tain.Researchers have therefore turned to AI as an efficient way of dealing with the problems created by big data.

This special issue ofZTE Communicationswill be dedicated to development，trends，challenges，and current practices in artificial intelligence for the Internet of Things.Position papers，technology overviews，and case studies are all welcome.

Appropriate topics include but are not limited to:

·Information technologies for IoT

·Architecture and Layers of IoT

·AI technologies for supporting IoT

·Image and Speech Signal Processing for IoT

·Affective Computing for IoT

·Information Fusion for IoT

·Artificial Consciousness and Integrated Intelligence for IoT of telecommunications equipment and network solutions.The jour?nal focuses on hot topics and cutting edge technologies in the tele?com industry.The journal has been listed in Inspec，the Ulrich‘s Periodicals Directory，Index of Copernicus(IC)and Cambridge Sci?entific Abstracts(CSA).ZTE Communicationswas founded in 2003 and has a readership of 6000.It is distributed to telecom operators，science and technology research institutes，and colleges and univer?sities in more than 140 countries.

ZTE Communications(http://www.zte.com.cn/magazine/English) is a quarterly peer-reviewed technical journal ISSN(1673-5188) and CODEN(ZCTOAK).It is edited，published and distributed by ZTE Corporation(http://www.zte.com.cn)，a leading global provider

Final submission due:Feb.5，2015

Publication date:Jun.1，2015

Please email the guest editor a brief description of the article you plan to submit by Jan.15，2015.

Submission Guideline:

Submission should be made electronically by email in WORD for?mat.

Guest Editors:

Prof.Fuji Ren

Univ.of Tokushima，Japan，ren@is.tokushima-u.ac.jp

Prof.Yu Gu

Hefei University of Technology，China，yugu.bruce@gmail.com