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Interference-Aware Resource Optimization for Device-to-Device Communications in 5G Networks

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>31/12/2018
<mark>Journal</mark>IEEE Access
Number of pages16
Pages (from-to)78437-78452
Publication StatusPublished
Early online date4/12/18
<mark>Original language</mark>English


In this paper, we investigate the resource optimization problem for device-to-device (D2D) communications in the fifth-generation cellular networks, where multiple D2D links and cellular links share the same spectrum. A general framework is proposed to jointly optimize the energy efficiency (EE), spectral
efficiency (SE), and queuing delay. Specifically, we formulate the problem as a stochastic optimization model aiming at maximizing the EE and SE concurrently under the network stability constraint, where subchannel allocation and power control are jointly optimized. Afterwards, with the help of Lyapunov techniques and weighted sum method, it is then transformed into a single-objective optimization problem, which is a mixedinteger and non-convex problem. Therefore, to solve this challenging subchannel allocation and power
control problem with low computational complexity, we separate it into two levels of problems, and a twostage iterative algorithm is proposed, which only requires polynomial computational complexity. Through theoretical analysis and numerical results, the effectiveness, convergence, and optimality of the proposed algorithm are validated.