Исследование влияния внеполосного излучения на производительность сетей 5G NR-U
NR-U is a technology that allows fifth generation cellular networks to utilize unlicensed frequency bands, in particular, the 5 GHz band. In order to increase throughput, an NR-U base station (gNB) can operate at the same time in several frequency channels located within this band. However, a gNB can not always simultaneously transmit in one channel and perform the channel access procedure in another channel because of the out-of-band emission problem, which leads to channel underutilization. As a result, throughput of NR-U networks can highly depend on the out-of-band emission level. In this paper, using simulation, the impact of out-of-band emissions on NR-U performance is studied with all channel access methods defined in the NR-U specification. It is shown that out-of-band emission level affects the choice of the channel access method which is optimal in terms of throughput. It is also shown that out-of-band emissions do not always have a negative impact on NR-U performance, and sometimes they allow to achieve more than 30% throughput gain.