We consider joint optimization of user-to-basestation (BS) association, and time-frequency resource block (RB) and power allocation in heterogeneous networks (HetNets). The objective is to develop a design: 1) that maximizes the number of users accommodated in the network while satisfying their quality of service (QoS) demands; and 2) that minimizes usage of the resources required to meet these demands. We investigate two novel instances of HetNets with opportunistic RB-reuse. In the first instance, user-to-BS associations, and power allocations can be time-shared, and the RBs can be reused during the signalling interval. For this instance, it is shown that the design problem can be approximated by a problem that yields tight convex upper and lower bounds on the objective. In contrast, the second instance represents a case in which the RBs can be reused, but the userto- BS associations, and power allocations are not time-shared, and hence, fixed throughout the signalling interval. The latter case gives rise to a combinatorial optimization problem, which we provide an approximate solution for by using a polynomialcomplexity two-phase approach based on semidefinite relaxation (SDR) with randomization.

Additional Metadata
Keywords Complexity theory, convex optimization, Gaussian randomization, HetNet, Long Term Evolution, opportunistic RBreuse, Optimization, Quality of service, Resource management, semidefinite relaxation, Signal to noise ratio, time-sharing, Wireless communication
Persistent URL dx.doi.org/10.1109/TWC.2017.2751467
Journal IEEE Transactions on Wireless Communications
Citation
Sokun, H. (Hamza), Gohary, R, & Yanikömeroǧlu, H. (2017). A Novel Approach for QoS-Aware Joint User Association, Resource Block and Discrete Power Allocation in HetNets. IEEE Transactions on Wireless Communications. doi:10.1109/TWC.2017.2751467