What is 5G?
5G is an advanced wireless technology that has begun wide deployment in 2019. 5G networks are digital cellular networks, in which the service area covered by providers is divided into small geographical areas called cells. Analog signals representing sounds and images are digitized in the telephone, converted by an analog to digital converter and transmitted as a stream of bits. All the 5G wireless devices in a cell communicate by radio waves with a local antenna array and low power automated transceiver (transmitter and receiver) in the cell, over frequency channels assigned by the transceiver from a pool of frequencies that are reused in other cells. The local antennas are connected with the telephone network and the Internet by a high bandwidth optical fiber or wireless backhaul connection. As in other cell networks, a mobile device crossing from one cell to another is automatically 'handed off' seamlessly to the new cell.
Verizon and a few others are using millimeter waves. Millimeter waves have shorter range than microwaves, therefore the cells are limited to smaller size. Millimeter waves also have more trouble passing through building walls. Millimeter wave antennas are smaller than the large antennas used in previous cellular networks. They are only a few inches (several centimeters) long. Another technique used for increasing the data rate is massive MIMO (multiple-input multiple-output). Each cell will have multiple antennas communicating with the wireless device, received by multiple antennas in the device, thus multiple bitstreams of data will be transmitted simultaneously, in parallel. In a technique called, beamforming, the base station computer will continuously calculate the best route for radio waves to reach each wireless device, and will organize multiple antennas to work together as phased arrays to create beams of millimeter waves to reach the device.
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Over 20 networks are deployed using mid-band spectrum, from 2.4 to 4.2 GHz. Mid-band networks have better reach, bringing the cost close to the cost of 4G. T-Mobile USA and AT&T are announcing low-band 5G in December 2019. The performance, reach, and cost will be similar to 4G in the same band when the 5G systems are fully developed and can access more carrier frequencies.
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The new 5G wireless devices also have 4G LTE capability, as the new networks use 4G for initially establishing the connection with the cell, as well as in locations where 5G access is not available. 5G can support up to a million devices per square kilometer, while 4G supports only up to 100,000 devices per square kilometer.
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source: https://en.wikipedia.org/wiki/5G