Abstract
Small cells and Device-to-Device (D2D) communication can improve the coverage and capacity of cellular systems, thereby enabling an enriched customer experience. To optimize that experience, this paper considers a problem of uplink weighted sum rate maximization for a single cell heterogeneous network containing macro cellular users, D2D users and femto-cell users. In particular, in order to control the co-tier and cross-tier interferences, a new Fractional Frequency Reuse (FFR) architecture is developed in which we seek to maximize a weighted sum rate, subject to minimum rate requirements and transmission power constraints. In order to tackle the resulting mixed integer nonlinear optimization problem, we develop a decomposition-based strategy. The proposed strategy solves the admission control, power control, and matching subproblems optimally, and allocates the remaining free sub-channels by using a heuristic suboptimal algorithm. Numerical results demonstrate that the proposed scheme, on average, achieves around 96% of the system sum rate of the optimal Branch and Bound method with much lower computational cost.
Highlights
Heterogeneous Network (HetNet) and Device-to-Device (D2D) communication are promising techniques to improve the spectral efficiency of wireless communication networks [1]
In this paper, the problem of weighted sum rate maximization for the uplink of a three-tier HetNet including a macrocell with cellular users, D2D devices and femtocells with femto users is tackled
The minimum rate requirements of all users and power constraints of the Femto-cell Users (FUs) and D2D users (DUs) are taken into account in the maximization problem
Summary
Heterogeneous Network (HetNet) and Device-to-Device (D2D) communication are promising techniques to improve the spectral efficiency of wireless communication networks [1]. The capacity maximization problem for Femto-cell Users (FUs) was solved in [19] through a joint channel allocation, mode selection and power control scheme for CUs and DUs in femtocells. The authors in [20] considered a D2D network capacity maximization problem subject to QoS requirements and power constraints They proposed an FFR scheme in order to reduce the cotier interference between the neighboring macrocells. The power assignment was fixed and it did not consider the QoS requirements for the DUs and FUs. The authors in [21] investigated joint user association and multi-cell resource allocation using an FFR framework for spectrum sharing among cells in heterogeneous networks.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
