Abstract
Resource allocation of cellular-assisted device-to-device (D2D) communication is very challenging when frequency reuse is considered among multiple D2D pairs within a cell, as intense inter D2D interference is difficult to tackle and generally causes extremely large signaling overhead for channel state information (CSI) acquisition. In this paper, a novel resource allocation framework for cellular-assisted D2D communication is developed with low signaling overhead while maintaining high system capacity. By utilizing the spatial dispersion property of the D2D pairs, a geography-based sub-cell division strategy is proposed to divide the cell into multiple sub-cells and the D2D pairs within one sub-cell are formed into one group. Then, sub-cell resource allocation is performed independently among the sub-cells without the need of any prior knowledge of inter D2D interference. Under the proposed resource allocation framework, a tractable approximation for the inter D2D interference modeling is obtained and a computationally efficient expression for the average ergodic sum capacity of the cell is derived. The expression further allows us to obtain the optimal number of sub-cells, which is an important parameter for maximizing the average ergodic sum capacity of the cell. It is shown that with small CSI feedback, the system capacity can be improved significantly by adopting the proposed resource allocation framework, especially in dense D2D deployed systems.
Highlights
T HE tremendous growth of multimedia applications leads to strong demands for high data-rate and low latency services in future wireless mobile communications
To minimize the impact of D2D communication on existing cellular resource allocation, in this paper, we focus on the orthogonal sharing mode as mentioned in [14], where dedicated spectrum is allocated to the D2D pairs within the cell
Since the inter D2D interference closely depends on the positions of D2D pairs, instead of maximizing the instantaneous system sum capacity, we aim to investigate the optimal number of sub-cells that maximizes the average ergodic sum capacity of cellular D2D underlaid orthogonal frequency division multiple access (OFDMA) systems in this paper, where the ergodic sum capacity is averaged over D2D pairs’ locations
Summary
T HE tremendous growth of multimedia applications (e.g. video content delivery, online gaming, etc.) leads to strong demands for high data-rate and low latency services in future wireless mobile communications. Sub-optimal system performance of D2D communications could be obtained based on different optimization frameworks, perfect knowledge of channel state information (CSI) between the transmitter and receiver of any D2D pair was generally assumed at the BS Such inevitable high signaling overhead and computational complexity make the resource allocation algorithms difficult to be implemented in practical systems with the growing density of D2D communications [21]. We further analyzed the inter D2D interference between D2D pairs under our proposed resource allocation framework thoroughly, based on which, the analytical expression of average ergodic sum capacity is derived as a function of the number of sub-cells that is a vital system parameter for the sub-cell division strategy.
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