An Approach for Interference Mitigation in Device-to-Device Communication Networks via User Distribution

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Abstract:

The advent of Fifth Generation cellular networks has introduced Device-to-Device (D2D) communication as a transformative technology, enabling direct communication between proximate devices without routing through a Base Station (BS). This paper highlights the manifold advantages of D2D communication, including data traffic alleviation, location-aware services, social networking, and smart city applications. However, the implementation of D2D Communication Networks poses significant challenges, notably Interference Management, which critically hampers effective communication. To enhance D2D Communication’s efficacy and capitalize on its potential, addressing interference becomes paramount.

Various researchers have proposed diverse strategies to mitigate interference and enhance D2D Communication. A significant focus has been on Soft Frequency Reuse (SFR) through equitable bandwidth allocation. The SFR approach categorizes users within the cellular network into Center Users and Edge Users. This study presents three distinct bandwidth allocation algorithms: Separate Bandwidth Allocation, Overlapping Bandwidth Allocation, and Hybrid Bandwidth Allocation. These algorithms cater to three user categories, aiming to mitigate interference between the Cellular Network and D2D Communication Network. Bandwidth distribution is executed impartially, accounting for user demand in both networks to diminish interference. User selection follows a random process.

The effectiveness of the proposed algorithms is assessed through MATLAB simulations, evaluating Signal-to-Interference plus Noise Ratio (SINR) and system capacity. The research findings are showcased by juxtaposing performance metrics across varying quantities of D2D users within the network. A notable contribution of this study is the evaluation of the impact of D2D network size on Cellular Network performance. In comparing the two new algorithms (Separate Bandwidth Allocation and Overlapping Bandwidth Allocation) against fixed allocation, the Hybrid and Separate schemes outperform others in terms of D2D Users SINR by up to 34%, albeit this advantage diminishes to 27% when D2D users exceed 30% of the network. Thus, system performance wanes as D2D user population escalates.

Looking ahead, future research avenues include refining the algorithms to accommodate larger D2D user populations, thereby sustaining and enhancing system performance.

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