时延QoS保证的D2D-based V2V车载通信功率分配方案

Power allocation for D2D-based V2V vehicular communication with delay QoS guarantee

OFDMA蜂窝网络中采用Underlay模式的基于终端直通技术的车-车(D2D-based V2V)通信能够提高频谱利用率、增大系统吞吐量,但随之产生的同频干扰问题严重影响通信质量。为了解决该问题,同时满足车辆通信的低时延服务质量(QoS)需求,提出一种基于时延QoS保证的D2D-based V2V车载通信功率分配方案。该方案同时考虑了蜂窝用户和D2D-based V2V用户所受到的干扰,并采用有效容量提供QoS保障,通过拉格朗日对偶分解法求解优化问题。数值仿真表明,相比于其他方案,该方案能够很好地提高系统有效容量。

Device-to-device based vehicle-to-vehicle(D2D-based V2V)communication underlaying OFDMA cellular network can improve spectral efficiency and system throughput.However,frequency reuse interference will severely affect on the communication quality.To overcome this problem,this paper proposes a power allocation strategy with delay QoS guarantee for each D2D-based V2V user′s requirement.The strategy takes the interference of cellular user and D2 D-based V2 V user into account,and provides the effective capacity as the delay QoS guarantee.Moreover,the Lagrangian dual decomposition method is used to obtain the opti-mization power allocation.Numerical simulation results show that compared to other strategies,the proposed power allocation ap-proach can significantly improve the system effective capacity.