Survey on edge computing and its evolution

Edge computing is the key technology for 5G to achieve high bandwidth and low latency. It has been widely applied in vertical industries. However, with the fast development of various intelligent application services, operators put forward new requirements for MEC as an edge cloud. Operators are continuously exploring how to help users find edge nodes more quickly, how to smoothly migrate users within edge nodes, and how to better serve vertical industry customers. This paper first introduced the development history of MEC technology. Then application scenarios of MEC are described. Later functions and architecture of MEC are described with the most popular function. After that 5G System enhancements for edge computing are introduced with R17, R18 and even R19 assumptions. Then the latest Work item ETSI MEC 047 is introduced. Lastly, the conclusion is made about development of MEC in future.