Abstract
In cellular networks, device-to-device communications can increase the spectrum efficiency, but some conventional schemes only consider uplink or downlink resource allocation. In this paper, we propose the joint uplink and downlink resource allocation scheme which maximizes the system capacity and guarantees the signal-to-noise-and-interference ratio of both cellular users and device-to-device pairs. The optimization problem is formulated as a mixed integer nonlinear problem that is usually NP hard. To achieve the reasonable resource allocation, the optimization problem is divided into two sub-problems including power allocation and channel assignment. It is proved that the objective function of power control is a convex function, in which the optimal transmission power can be obtained. The Hungarian algorithm is developed to achieve joint uplink and downlink channel assignment. The proposed scheme can improve the system capacity performance and increase the spectrum efficiency. Numerical results reveal that the performance of the proposed scheme of jointly uplink and downlink is better than that of the schemes for independent allocation.
Highlights
With the rapid popularity of intelligent devices, the cellular systems are suffering an unprecedented pressure imposed by the explosive growth of data traffic and a massive increase of interconnected devices [1,2,3]
When the mth cellular users (CUs) uses the uplink spectrum, the received signal-to-noise-and-interference ratio (SINR) for the mth CU can be expressed as γmc,up where Pmc and Pkd are the transmission power of the mth CU and the transmitter of kth D2D pair, respectively, gmB is the channel gain of the signal link between mth CU and the BS, hkB is the channel gain of the interference link between the transmitter of kth D2D pair and the BS, and σ2 is the power of additive Gaussian white noise on each channel
We propose the joint uplink and downlink resource allocation scheme in a single cell system with both CUs and D2D pairs
Summary
With the rapid popularity of intelligent devices, the cellular systems are suffering an unprecedented pressure imposed by the explosive growth of data traffic and a massive increase of interconnected devices [1,2,3]. The interference management algorithm is presented, which includes admission control, power allocation, and channel assignment in reference [30] These two algorithms only maximize the total data rate of D2D, while not being optimal to the overall system data rate. We consider the joint uplink and downlink resource allocation scheme to maximize the total system capacity.
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