Operators obviously need to migrate spectrum from LTE to NR But pressure on operators to refarm must be ‘relaxed’ as long as some spectrum remains dedicated to LTE The Next Generation Mobile Networks (NGMN) Alliance has published a white paper urging the industry to support so-called Option 4 as a crucial stage in the development of 5G. It says the establishment of Option 4 will allow the industry to “quickly and efficiently bring new 5G-based services to market.” The White Paper is designed to set the scene for a trial of Option 4 this year to “encourage Option 4 development within the 5G ecosystem.”