摘要
To meet the rapid growth of mobile communications services,the continuously upgraded wireless networks significantly increase the demand for radio spectrum resources.However,the spectrum supply is limited,thus triggering the spectrum demandsupply gap.Consequently,dynamic spectrum sharing emerges as a promising paradigm of enhancing spectrum usage,which has been widely recognized and adopted in commercial wireless standards,such as the 4G LTE,5G NR,and so on.As part of 3GPP Release 15,operators allocate portions of the 4G LTE spectrum that they are already using to 5G NR-this means that 4G LTE and 5G NR users can coexist in the same frequency band/channel at the same time.A software upgrade makes it possible to use existing RAN to deliver 5G services to unleash the potential of artificial intelligence in mobile networks.
