IEEE Wireless Communications • February 2016 22 1536-1284/16/$25.00 © 2016 IEEE ABSTRACT In recent years, in-vehicle infotainment net- works (IVINs) have rapidly become one of the most valuable features auto makers have used to promote their flagship models as an advanced competitive marketing weapon. IVINs can pro- vide passengers with multimedia services locally as well as Internet connectivity through a gate- way known as a mobile hotspot. The in-vehicle mobile hotspot is embedded in the car and sup- ports cellular connection. Utilizing this system, mobile devices can access the in-vehicle unified infotainment framework to comfortably enjoy streaming services, online games, online com- merce, social network services, and so on. How- ever, because of wireless access characteristics, if a significant number of Wi-Fi mobile hotspots are densely located, the throughput of the mobile devices will be tremendously diminished due to the interference among the mobile hotspots of IVINs, as well as with existing fixed office or res- idential APs along the road. In this article, we discuss the interference problems of Wi-Fi access in IVINs, provide effective solutions to these problems, and present the performance of each proposed approach within typical case studies. INTRODUCTION Today, Internet of Things (IoT) technology is turning vehicles into the hub of an entire eco- system of connected services that offer users a wealth of benefits, including enhanced safety and security, a richer user experience, and a new suite of product offerings. Cars have been enabling us to connect our devices via Bluetooth to make calls and navigate; however, it is not currently possible for streaming apps to provide the con- tent we love without the need to fiddle with our phones while driving and consume valuable data plans. By leveraging the always-on connectivity that IoT provides, today’s connected car man- ufacturers are providing an entirely new inter- face for delivering and interacting with streaming content services. In-vehicular infotainment tech- nology is the perfect answer for all of our mobile requirements [1]. The in-vehicular infotainment network (IVIN) changes the choices of people thinking about travelling by car. Instead of a boring trip without anything to do, passengers can now enjoy various entertainment services as a personal relaxation experience, including streaming ser- vices, online games, online commerce, and social network services. Moreover, the convergence of all services, content, and connections into one unified infotainment framework creates a very convenient environment for passengers as well as drivers [2]. The IVIN interconnects various ser- vices, content, and application providers through mobile data networks such as Long Term Evolu- tion (LTE) (Fig. 1). Although application services offered by the IVIN are interesting to consider, in the scope of this article, we would like to consider the IVIN in terms of its connectivity, which is an import- ant component of a successful system. Due to the mobility behavior, keeping the IVIN connected with the outside world while retaining high user experience is still a question for researchers and manufacturers. Recently, connected car services have been researched and developed by a large number of companies and research organizations [3]. In fact, this technology has been commercial- ized by a large number of companies in recent years. For instance, Ford Motor Company intro- duced Sync3, based on the Blackberry QNX plat- form, in order to provide a stable and connected ecosystem [4]. Of course, there are a lot of pro- posed technologies that can be utilized to provide inside and outside connectivity for the IVIN, such as inter-vehicular communication architecture [5], cognitive radio enabled vehicles [6], dynamic bandwidth distribution [7], as well as various other technologies. However, none of them have been commercialized yet. The popularity of Wi-Fi sup- ported devices directs connected car inventions toward using Wi-Fi as a default acceptable tech- nology. The fully connected car is assumed to be equipped with ubiquitous high-speed mobile pack- et data such as LTE, along with the global posi- tioning system (GPS) [8]. This vehicle might use a gateway that transparently distributes LTE data to users in order to augment the mobile services through in-vehicle wireless local area networks (WLANs) such as IEEE 802.11. WOONGSOO NA, NHU-NGOC DAO, AND SUNGRAE CHO M ITIGATING W I F I I NTERFERENCE TO I MPROVE T HROUGHPUT FOR I N -V EHICLE I NFOTAINMENT N ETWORKS W IRELESS /M OBILE C ONNECTED E NTERTAINMENT The authors are with Chung-Ang University.