By Essaïd Sabir, Hicham Medromi, Mohamed Sadik

This quantity publishes new developments and findings in scorching issues on the topic of ubiquitous computing/networking. it's the consequence of UNet - ainternational clinical occasion that happened onSeptember 08-10, 2015, within the attention-grabbing urban of Casablanca, Morocco. UNet’15 is technically subsidized by way of IEEE Morocco part and IEEE COMSOC Morocco Chapter.

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    Two cases occur, the first one when SU accepts the leasing proposition; hence the PU can make a benefit thanks to the price of service. whereas the second case is when rejects the leasing propositions and choose to sense himself the channel to opportunistically use it thus the PU will not make benefit but lose the energy of making proposition. The payoff function obtained whether the secondary accepts the service proposition or not, is represented in the following discontinuous utility function as follow.

    Cooperative and non-cooperative sharing methods are analyzed and compared in [10]. [12] presents a leasing model that enhances the profit of secondary operator and spectrum owner. the paper [2] is about developing cognitive sensing and access strategies that learn from observations. Learning algorithms are proposed in [3], [4] when authors of [5] study the channel selection issue of SUs and propose some algorithms to perform the accessibility check based on measurements of primary signals. 2 Purpose of this Paper and Contribution Unlike previous works, our paper tackles a new spectrum leasing framework.

    Elsevier International Journal of Computer Communications 35(3), 273–286 (2012) Enhanced Hybrid Uplink Time Difference of Arrival and Assisted Global Positioning System for UMTS Users Ilham El Mourabit, Aïcha Sahel, Abdelmajid Badri and Abdennaceur Baghdad * Abstract Due to the growing needs of positioning solutions serving for both emergency cases and daily life uses, many researches are carried out to enhance the existing techniques in a way to find a robust method that meets the expectations of both areas.

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