Local positioning services on IEEE 802.11 networks

Abstract

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DOA and TOA Based Localization Services Protocol in IEEE 802.11 Networks

“…LoBs) are utilized, but at the cost of increasing computational complexity. In [15] a possible candidate for LSN antenna is presented, working at 2.4 GHz, according to IEEE 802.11 requirements.…”

Location aware mobility assisted services for heterogeneous wireless technologies

“…In this work though, the technique is based on the amplitude of the signals received by each node while we only look at Euclidean distances. Moreover, these techniques perform rather poorly compared to our distance based approach, since in complex indoor environments the received signal is prone to fading induced by multipath [4].…”

“…One example is shown in [4], where the authors deploy a grid of reference nodes that communicate with mobile terminals, and then triangulate to determine their locations. Our technique provides such service even in outdoor scenarios.…”

“…In particular, we consider a grid of cooperating Location Service Support nodes and a Location Service Server (LSS). The fundamental tasks of the LSS, are: (i) registration of incoming MTs, (ii) distribution of synchronization signals, (iii) coordination of TOA measurement, (iv) TOA measures collection, (v) location estimate, and (vi) location notification (detailed in [4]). …”

“…However, while Global Positioning Service (GPS) technologies guarantee stable user-tracking services in outdoor environments, sufficient strength of satellite signals cannot be assumed in indoor scenarios. Literature shows that independently by the adopted technology and from the scenario (indoor or outdoor), local positioning services should be provided [4]. We propose a location aware mobility-assisted technique, which aims at the twofold goal of tracking mobile users and providing seamless service continuity in heterogeneous environment.…”