V2X通信中非周期业务下的两种分布式资源分配机制

TWO DISTRIBUTED RESOURCE ALLOCATION MECHANISMS FOR APERIODIC TRAFFIC UNDER V2X

针对无基站覆盖情况下5G V2X通信下非周期业务,由于来包时刻不固定导致用户之间干扰不可预测而造成丢包的问题,从半静态和动态调度角度提出不同的资源分配机制:一是基于感知与监听控制信息,采用对预留资源的失活与激活的方式为用户提供资源选择辅助信息,并在出现丢包时对预留资源重新配置;二是类似于随机回退的机制,根据当前传输条件减少计数器直至零,计数器为零时传输。仿真结果表明,两种机制都较LTE原有的机制有更高的平均收包率和平均吞吐量。

Aimed at the problem of packet loss caused by unpredictable interference among users due to the unfixed time to packet the aperiodic service of 5 G V2 X communication without base station coverage,different resource allocation mechanisms are proposed from the perspective of semi-static and dynamic scheduling.The first was based on the sensing and monitoring of control information.It used the deactivation and activation of reserved resources to provide users with auxiliary information for resource selection,and reconfigured reserved resources in case of packet loss.The second was a mechanism similar to random back-off,which reduced the counter to zero according to the current transmission condition,and transfered when the counter is zero.Simulation results show that the two mechanisms have higher average packet rate and average throughput than the original LTE mechanism.