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To provide the significantly increased number of devices and demands in bandwidth for various applications, the Citizens Broadband Radio Service (CBRS) is considered as an approach. Further, the domain proxy is integrated into a self-organized networking (SON) server to assist Citizens Broadband Radio Service Devices (CBSDs) following CBRS protocol to communicate with Spectrum Access System (SAS) for 3.5 GHz spectrum access. In this paper, we design and implement a domain proxy following the CBRS communication protocol to proxy a CBSD for spectrum acquisition and relinquishment. The communication protocol can be presented in two state machines, and the state transition is performed according to the data transmission relationship between the SAS and the CBSD, indicating the use of the 3.5 GHz spectrum. Further, the implemented communication protocol is verified by the SAS simulator published by WInnForum. In the future, we will develop and integrate a dynamical spectrum allocation algorithm in domain proxy to arrange the acquired spectrum for CBSDs according to different scenarios.