Communication method and device

The invention provides a communication method and device, and is applied to the technical field of communication. The communication method provided by the application comprises: a first cell receives a registration request message from a terminal device, and sends a plaintext ID query message to the terminal device, the plaintext ID query message being used for requesting to authenticate identity information of the terminal device; the terminal device sends identity information of the terminal device to the first cell in response to the plaintext ID query message; the first cell receives the identity information and sends a registration refusal message and an RRC RELEASE message to the terminal device according to the identity information, and the registration refusal message carries a refusal reason value as a first refusal reason value; and under the condition that the RRC RELEASE message comprises the redirection to the low-standard cell, executing a forbidding instruction on the first cell. According to t