非授权频段上Wi⁃Fi和5G NR共存优化研究

Optimal coexistence of Wi⁃Fi and 5G NR in unlicensed band

针对授权频谱资源短缺问题,提出了Wi⁃Fi和5G新空口在非授权频段共存优化方案。首先,分别分析了Wi⁃Fi系统、非授权频段新空口系统和二者共存系统吞吐量,并调整了非授权频段新空口帧结构。然后,考虑通过部分带宽技术灵活切换分配频谱资源,并利用用户碰撞概率来动态调整其频谱切换计时器长度。最后,考虑共存网络中新空口用户吞吐量和时延的联合优化问题,将该非线性问题线性化并求解。仿真表明,该方案能有效提高新空口用户吞吐量并降低时延。

Aimed at the shortage of licensed spectrum resources,an optimization coexistence scheme for Wi⁃Fi and 5G NR(new radio)in an unlicensed band is proposed.Firstly,the throughput of the Wi⁃Fi system,the NR in the unlicensed band system and the coexistence system in the unlicensed band is ana⁃lyzed.Among them,the frame structure of the NR the in unlicensed band is adjusted.Then,the band⁃width part(BWP)technology is used to flexibly switch and allocate the spectrum resources.Meanwhile,the length of the spectrum switching timer is dynamically adjusted according to the collision probability of users.Finally,the joint optimization problem of the throughput and delay of NR users in the coexistence network is considered and the nonlinear problem is linearized to be solved.The simulation results show that the scheme can effectively improve the throughput of new radio users and reduce the delay.