To avoid the foreseeable spectrum crunch, LTE operators have started to explore the option to directly use 5GHz unlicensed spectrum band being used by IEEE 802.11 (WiFi). However, as LTE is not designed with shared spectrum access in mind, there is a major issue of coexistence with WiFi networks. Current coexistence schemes to be deployed at the LTE-U BS create coexistence gaps only in one doma...

Taking advantage of the characteristics of high security, convenience, and low power consumption in Near Field Communication (NFC) technology, this paper proposes programs of using NFC to establish a connection for Bluetooth and WiFi transmission. The combination of NFC, Bluetooth and WiFi can avoid the complex process of searching devices, pairing or joining the LAN in the traditional Bluetoot...

This paper presents a method that trains the WiFi fingerprint database using sensor-based navigation solutions. Since micro-electromechanical systems (MEMS) sensors provide only a short-term accuracy but suffer from the accuracy degradation with time, we restrict the time length of available indoor navigation trajectories, and conduct post-processing to improve the sensor-based navigation solut...

The heterogeneous interface for the mobile node is the key feature for the next generation mobile world. It provides the flexibility for the mobile devices for moving devices to the next available best network for high data rate connection. So it is firstly important to develop in ns2 for the research and educational purposes. It is very important to develop it in ns2 so that we can do experime...

Operators have recently resorted to WiFi offloading to deal with increasing data demand and induced congestion. Researchers have further suggested the use of “delayed offloading”: if no WiFi connection is available, (some) traffic can be delayed up to a given deadline, or until WiFi becomes available. Nevertheless, there is no clear consensus as to the benefits of delayed offloading, with a cou...

WiFi based phones are becoming increasingly popular due to the ubiquitous presence of wireless LANs and the use of unlicensed spectrum. These phones use VoIP techniques over wireless LANs. In addition to the spectral efficiency and security issues, power consumption is a vital issue in making the usage of these phones widespread. Efforts are underway in improving power conservation in these pho...

The framework of this paper is robot localization inside buildings usingWiFi signal strength measure. This localization is usually made up of two phases: training and estimation stages. In the former the WiFi signal strength of all visible Access Points (APs) are collected and stored in a database or Wifi map, while in the latter the signal strengths received from all APs at a certain position ...

The methodology of our WiFi based indoor localization system is built upon passive cooperation of occupants only which does not interrupt the daily lives of them. Instead of modifying the hardware or software of occupants’ mobile devices, we upgrade the software of the existing commercial WiFi access points (APs) in the indoor environment to WiFi sniffers, which can detect the received signal s...

Continuous logging of a person's geographical position is required for various " life-log " applications, such as memory aids, automatic blog generation, and life pattern analysis. GPS is one way of logging, but it is unable to track movements indoors, and hence cannot track people !G s ordinary activities. We propose a WiFi-based location detection technology for location logging. It detects a...