WiFi offloading has emerged as a key component of cellular operator strategy to meet the data needs of rich, mobile devices. As such, mobile devices tend to aggressively seek out WiFi in order to provide improved user Quality of Experience (QoE) and cellular capacity relief. For home and work environments, aggressive WiFi scans can significantly improve the speed on which mobile nodes join the ...

95 ABSTRACT: The integration of WiFi and WiMAX will allow seamless connection between users from both systems with a greater capacity, higher bit rates and mobility access. To enable interoperability between WiFi and WiMAX a special gateway is required known as WiFi/WiMAX router. In this paper, we investigate, through the use of OPNET simulation tools, number of WiFi users or hotspots could acc...

In recent years, WiFi fingerprint-based localization has received much attention due to its deployment practicability. In this work, we investigate the impact of different indoor environmental factors on the performance of WiFi-fingerprinting. We find that, WiFi-fingerprinting highly depends on the deployed indoor environment. In an open space, it is quite challenging to find spatially varying ...

The stunning growth of WiFi networks, together with the spreading of mobile telephony and the increasing use of Voice over IP (VoIP) on top of Internet, pose relevant questions on the application of WiFi networks to support VoIP services that could be used as a complement and/or competition to the 2G/3G cellular networks. Voice has been, is, and will surely be one of most important killer appli...

The rapid advances in networking, mobile computing, and virtualization, lead to a dramatic increase in the traffic demand. A cost-effective solution for serving it, while maintaining a good quality of service (QoS), would be to offload a part of the traffic originally targeted for cellular base stations (BSs) to a WiFi infrastructure. Related work on the WiFi offloading often considers markets ...

A promising way to use limited 3G mobile resources efficiently is 3G mobile traffic offloading through WiFi by the user side. However, we currently do not know enough about how effective the mobile traffic offloading is in the wild. In this paper, we report the results of a two-day-long user-based measurement of mobile traffic offloading by over 400 android smartphone users in Japan. We first e...

We investigate if WiFi access can be used to augment 3G capacity. To understand the feasibility of 3G augmentation, we conduct a detailed study of 3G and WiFi access from moving vehicles, in three different cities. We find that the average 3G and WiFi availability across the testbeds is 87% and 11%, respectively. We also find that, unlike stationary environments, WiFi throughput is lower than 3...

The localization of handset devices gains more and more importance in various fields, such as advertisement, navigation, safety and also observation and tracking. The accuracy of localization improves by the years and offers more use to mobile applications, which make use of the knowledge of a user’s position. A well-known example of the apply of localization is the E911 mandate in the USA. It ...

been found to be lower than that of either solely through the WiFi and the UMTS networks. It is normally expected to be higher than traversing through the WiFi network only. Both the MOS (Mean Opinion Score) and the packet end-to-end delay were also found to be much lower than expected through the heterogeneous WiFi-UMTS network.