Massive MIMO小区PDCCH控制信道容量提升技术研究

Physical Control Channel Capacity Improvement in Massive MIMO Cells

5G大带宽业务信道资源多,但是随着用户增多,控制信道资源提前成为瓶颈,Massive MIMO的大容量能力很难发挥出来。特别是大话务场景用户数多、用户信号质量差、用户做小包业务等均会导致PDCCH CCE受限严重。针对上述不足,重点分析了重载场景控制信道受限对MM性能的影响,保障重载场景MM小区的调度能力。所提PDCCH容量提升方法在商用网络验证过程中,能有效降低重载场景PDCCH CCE分配失败比例,CCE失败比例下降30%~40%左右,MM小区调度能力提升20%,用户感知速率增益为15%~25%,评估结果符合预期。

5G large-bandwidth traffic has many channel resources,but as users increase,control channel resources become a bottleneck in advance,and it is difficult for massive MIMO’s large-capacity capabilities to be used.Especially in large traffic scenarios,there are many users,poor user signal quality,and user doing small packet services,which will cause severe PDCCH CCE limitation.In view of the above-mentioned shortcomings,the impact of the limited control channel in the heavy-load scenario on the MM performance is analyzed to ensure the scheduling ability of the MM cell in the heavy-load scenario.In the commercial network verification process,the proposed PDCCH capacity improvement method can effectively reduce the proportion of PDCCH CCE allocation failures in heavy-load scenarios.The CCE allocation failure rate decreases by about 30%to 40%,the scheduling capability of massive MIMO cells increases by 20%,and the user-perception rate gain is 15%to 25%.And the evaluation result meets the expectations.