Abstract:
Device-to-device (D2D) communication has been a hot topic recently because of its potential advantages such as high data rates, spectrum-efficient, energy-efficient, and commerce-promising. D2D communication has the advantage of maximum spectral usage, provides higher throughput. However, the improvement is needed for better quality of service (QoS) by providing the way of how D2D communication can be used with in cellular network (D2D and base station BS). To provide better QoS to the users, we need to improve on the exiting schemes and introduce the idea of D2D within the cellular network. This can be done by increasing the capacity which can accommodate more UEs as the number of mobile users and data usage demand is high. The idea is to split single cell within the cellular network, hence increasing cell capacity and offloading the base station.
In this research work, we evaluate how to improve the QoS for the UEs by calculating the system capacity of different D2D communication scenarios. The cell will be split into different rings and each ring has several small cells. As a result, different small cells can reuse the same frequency resources by determining which resource can be allocated a given frequency in the cellular network. Two cases were used to calculate the system capacity, CDMA based and OFDM based cases. In throughput calculation, we consider both ideal and realistic conditions. For the ideal condition, all bandwidth can be used for cellular or D2D communication. For realistic condition, we take into account the control and discovery overhead. The results shows that the scenarios largely improve the system capacity compared with other studies thus QoS is improved.
