Analysis of Group Distribution and Content Concentration for Packet Allocation in D2D Communication

Among the many popular issues that have been identified in the area of device-to-device (D2D) based packet caching technologies, a new aspect related to the competitions between various D2D user equipment (UE) groups, is not fully studied. Hence, in this paper, we investigate a few key perspectives of the competitions among UE groups with respect to the packet allocation strategy. We first analyze the impact from diverse group proportions on the system throughput and the fairness of packet allocations. Particularly, the new concept of group separation index (GSI) is introduced to help reflect the fairness of system-level packet allocations. Then, we evaluate how the concentration levels of diverse packet requests may affect the packet allocation strategy. Finally, simulation results validate our analysis and show the potential of the proposed analysis method. The new approach can provide important design hints for improving existing D2D-based packet caching schemes.