Efficient wireless networking with advanced services and negotiated QoS

In the AuRa project an efficient wireless networking scheme for mobile terminals with advanced services and negotiated quality of service (QoS) level was researched and developed. The project consisted of various topics in the various communication layers of the OSI model. In the physical and data link layers area spectral efficiency was researched It was observed that log-normal shadowing is very crucial for the spectral efficiency. In outdoor positioning, advantages of wideband channel delay profiles were utilised so that database correlation method (DCM) algorithm can locate the terminal using only one base station hereby avoiding the problem common to observed time difference of arrival algorithm (OTDOA). For the indoor positioning a configuration tool was developed to make signal chart measurement faster with more dense and accurate grid. Hence, the typical accuracy of positioning in indoor of 2 m was achieved. In vertical handover topics signalling schemes as well as key parameters mapping and classification for the related QoS issues were developed in order to make vertical handover possible between the WLAN and UTMS networks. In the QoS research an end-to-end QoS measurement tool was also developed. From the measurements significant variations in end-to-end latency time of General Packet Radio Systems (GPRS) were observed between different operators and terminal types. Network layer topics included power efficiency research on ad hoc and sensor networks taking into consideration mobility of nodes and the number of sequential hops in signalling and data delivery. Furthermore, methods and tools for parallel networking simulation were researched and the graphical user interface tool for the NS2 simulation tool was built with the aim of hiding the complexity of NS2 tool's scripts and distribution of simulation runs.