5ga is a transitional stage between 5G and 6G and an enhanced version of 5G technology. This naming method is because it has a long history in mobile communication technology, which started as early as 2G and 3G times, and the meaning of 5.5G and 5G-Advanced is the same. At that time, GPRS was called 2.5G, which was between 2GGSM and 3GUMTS. Before the birth of 5G, there were names such as 4.5G and pre5G in the industry, but the time was short. Based on the evolution of 5G, people followed the past habits and named 5.5G as the transitional stage. The upgrading of communication network technology is usually carried out once every ten years or so, and each integer generation has experienced 5-6 versions.