Umer Salim

TL;DR: The novel concept of RANaaS (Radio Access Network-as-a-Service) as a flexible architecture based on centralized processing, capable of handling the increasing interference in very dense networks, reducing energy consumption, cost-efficiently deploying and managing cellular networks is introduced.

TL;DR: A vision of the advantages of the RANaaS is given, its benefits in terms of energy efficiency are presented, and a consistent system-level power model is proposed as a reference for assessing innovative functionalities toward 5G systems.

TL;DR: An analytical framework for user association that jointly considers radio access and backhaul performance is proposed and an algorithm that takes into account spectral efficiency, base station load, backhaul link capacities and topology, and uplink and downlink traffic demand is derived and proves it converges to an optimal solution.

TL;DR: It is argued that user association policies are strongly coupled with the allocation of resources between UL and DL, and an algorithm is proposed that decomposes the problem into separate subproblems that can each be solved efficiently and in a distributed manner, and prove convergence to the global optimum.

TL;DR: The Gaussian half-duplex relay channel (G-HD-RC) is considered, a channel model where a source transmits a message to a destination with the help of a relay that cannot transmit and receive at the same time, and the cut-set upper bound on the capacity can be achieved to within a constant gap.