This Recommendation describes the functional architecture for the smart door lock (SDL) service framework. With the development of mobile communication technology and smart hardware, various technologies are introduced into the door lock to form the smart door lock. Multiple unlocking methods can be realized, and abnormal alarm reporting and flexible door lock management can be performed. In order to promote the deployment of the smart door lock (SDL) service around the world, a unified standard is needed to specify, and functions should be realized for the SDL service framework. The scope of this Recommendation includes the introduction of the SDL service framework, requirements of the SDL service framework and functional architecture of the SDL service framework.