Huawei is one of the largest technology companies in the world. Its headquarters and subsidiaries are all over the world. Huawei has tens of thousands of conference rooms and departments around the world, and more than 250000 employees around the world. How to solve the problem of fast and convenient access control for Huawei employees to conference rooms and departments, and how to optimize and save the work efficiency of employees is something Huawei's IT department has been exploring.