948th: What is anchor band?

　As of March 2020, the 5G provision method announced by each business operator is a NSA -method network configuration that uses existing LTE frequency bands and frequency bands for 5G at the same time.

　Why did the NSA -type 5G communication that use this anchor band provide service first than the SA system?

　It is that the 5G base station is currently built with small cells or spot cells, and the area is not covered with density that can be used anywhere.It can be said that LTE is an anchor that can promote 5g smooth introduction.

　In the NSA method, when the terminal is in the 5G area, the mobility and connection are provided in the existing LTE frequency band with C-PLANE (controlled prey, mobility and communication control) used in communication in the existing LTE frequency band.While covering gender, U-PLANE (user Plane, actually using users) can provide flexible and efficient services by utilizing the 5G frequency bandwidth that can use wider bands.

　And if the terminal is out of the 5G area, it is possible to continue sending and receiving user data seamlessly to 4G communication.

　For users, even if there is a communication switching in an area of 5g to 4G, you can continue to communicate without feeling so much uncomfortable (except for the display or the decrease in the communication speed).