Network and Location-Aware Service Selection: Reliability Assessment of Location Estimation

Kadas, George

4. term

Networks and Distributed Systems, Master

2014

2014-06-04

73 pages

This work contains a study to assess the impact of network-related parameters to the reliability of a user’s localisation when the user’s location can potentially change. User parameters such as speed and net- work parameters such as network delay, noise, localisation interface, etc. are tested in regard to the impact they have on the performance of service selection based on location estimation. A generic context simulator, Siafu, was used to simulate the context generated by users based on a predefined behavioural pattern. Thereafter the functionalities of the aforementioned simulator were extrap- olated to provide the basis as to enable op- erations on the provided information. From the extracted results, for the first scenario a 2.6 times increase to the max- imum mismatch probability is observed when the maximum delay is increased 9- fold. For the second examined scenario, it was seen that both low accuracy and high lock time for a localisation interface are triggers for high mismatch probability for a moving user. The GPS and cellular interfaces exhibited the highest mismatch probabilities (over 70 % in the ideal case). Since this number is thought to be high for a best case, the role of service density remains to be investigated.

Service Selection ; Context-aware ; Context ; Simulation ; Location Estimation

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