The 5th generation mobile communication technology 

The latest generation of cellular mobile communication technology, which is also an extension after 4G (LTE-A, WiMax), 3G (UMTS, LTE) and 2G (GSM) systems.

5G's performance goals are high data rates, reduced latency, energy savings, reduced costs, increased system capacity, and large-scale device connectivity.

The first phase of the 5G specification in Release-15 is to accommodate early commercial deployments.

The second phase of Release-16 will be completed in April 2020 and submitted to the International Telecommunication Union (ITU) as a candidate for IMT-2020 technology. The ITU IMT-2020 specification requires speeds up to 20 Gbit / s (20000 Mbps), which can achieve wide channel bandwidth and high-capacity MIMO.

There are three major differences between NSA and SA:

1) NSA does not have a 5G core network, and SA has a 5G core network. This is a key difference.

2) Under the NSA network, 5G and 4G are interconnected at the access network level, and the interconnection is complicated; under the SA network, the 5G network is independent of the 4G network, and 5G and 4G are only interconnected at the core network level, and interconnection is simple.

3) In the NSA network, the terminal is dual-connected with two wireless access technologies, LTE and NR; in the SA network, the terminal is connected with only one NR wireless access technology.

To put it simply, compared to SA, NSA lacks a new brain (5G core network), and it is still a bit of a drag on 5G-4G interconnection.

The seemingly simple architectural differences will involve a bunch of differences in performance indicators. These indicators mainly include network delay, uplink bandwidth, network agility, and service reliability. Let's talk about these performance differences.