考虑X2接口时延的系统仿真方法与CoMP性能分析

CoMP Performance When Considering X2 Backhaul Delay

为了评估LTE-A系统中X2接口时延对多点协作传输(CoMP)技术的实施所带来的影响,建立了有时延的系统信道模型,搭建了非零时延CoMP技术的系统级仿真平台,仿真了3种典型的CoMP方案.分析了系统性能、协商复杂度以及时延敏感程度的关系,指出系统性能随着时延的增加而急剧下降,系统对时延的敏感度随着协商复杂度的提高而增加,在回程时延大到一定值时,CoMP技术便不再适用于LTE-A系统.

To evaluate the influence of X2 interface time delay in long term evolution-advanced （LTE-A） system, we establish the channel model with time delay and conduct the system level simulation of three typical coordinated multipoint transmission/reception（CoMP） schemes. Finally, we evaluate the system performance at different time delay with different complexity of negotiation. It can be seen that the system performance will degrade with time delay increasing and the system will be more sensitive to delay when the negotiation becomes more complex. What＇ s more, if the X2 interface time delay grows to a certain threshold, it＇ s better not to apply CoMP in LTE-A system.