There are two spectrums of 5 G applications, the first band starts from 3.5-5GHz, and the second band is from 24.24GHz and above (Millimetre-wave)

Channel Allocation means to allocate the available channels to the cells in a cellular system. ... Channel Allocation Strategies are designed in such a way that there is efficient use of frequencies, time slots and bandwidth.

Working Principle In dynamic channel allocation schemes, frequency channels are not permanently allotted to any user. Channels are assigned to the user as needed depending upon the network environment. The available channels are kept in a queue or a spool. The allocation of the channels is temporary.

Instead channels are allotted to users dynamically as needed, from a central pool. The allocation is done considering a number of parameters so that transmission interference is minimized. This allocation scheme optimises bandwidth usage and results is faster transmissions.

Static Channel Allocation in LANs and MANs: It is the classical or traditional approach of allocating a single channel among multiple competing users Frequency Division Multiplexing (FDM). if there are N users, the bandwidth is divided into N equal sized portions each user being assigned one portion.You use the SET BACKUP COPIES command to instruct RMAN to create two identical copies of the database backup. Because the guideline is that the number of tape channels equals the number of tape devices divided by the number of duplexed copies, you allocate two channels.

Please specify clearly because the channel allocation mechanism works differently between cellular systems such as Mobile which is depends on the user's location, availability, power, edges, etc... and transmission techniques such as Microwave where from sub-band could determine the channel specifications. But overall it should consider a number of parameters to achieve the targeted performance such as the methodology of channels (fixed or adaptive), modulation techniques, and order.