To develop the IEC architecture, there are a couple of software-oriented architectural ways for building a flexible protocol architecture achieved by deploying and operating the architecture. One approach is an unified software-oriented architecture that composes logically modular functions in a tightly coupled way to similar with a monolithic architecture. Another approach is a microservice architecture, which loosely composes logically or physically separated processing functions as individual microservices. Since the IEC has been developed on different hardware specifications and various functionalities desired by each business demands, it has been standardized based on microservices and used as a reference standard for implementation. Adopting a microservices based IEC architecture facilitates continuous development and operation through the updating of individual microservices. This Recommendation specifies the signalling architecture, protocol interfaces, and protocol procedures for microservices based intelligent edge computing.