Policy Control Method, Device, and System

A policy control method, wherein the method comprises:

• sending, by a first session management network element, a policy control creation request to a first policy control network element, wherein the policy control creation request comprises an identifier of a terminal, single network slice selection assistance information (S-NSSAI), and a data network name (DNN);
• receiving, by the first policy control network element, the policy control creation request from the first session management network element;
• sending, by the first policy control network element, the identifier of the terminal, the S-NSSAI, the DNN to a binding support network element;
• and
• receiving, by the first policy control network element, an identifier of a second policy control network element from the binding support network element, and sending the identifier of the second policy control network element to the first session management network element, wherein the identifier of the second policy control network element is an identifier that is of a policy control network element, that corresponds to the identifier of the terminal, the S-NSSAI, and the DNN, and that is stored by the binding support network element;
• and
• receiving, by the first session management network element, the identifier of the second policy control network element.

A first policy control network element, wherein the first policy control network element comprising:

• at least one processor, and a memory storing computer-executable instructions;
• wherein the computer-executable instructions, when executed by the at least one processor, cause the first policy control network element to:
• receive a policy control creation request from a first session management network element, wherein the policy control creation request comprises an identifier of a terminal, single network slice selection assistance information (S-NSSAI) and a data network name (DNN);
• send the identifier of the terminal, the S-NSSAI, the DNN to a binding support network element;
• receive an identifier of a second policy control network element from the binding support network element;
• and
• send the identifier of the second policy control network element to the first session management network element, wherein the identifier of the second policy control network element is an identifier that is of a policy control network element, that corresponds to the identifier of the terminal, the S-NSSAI, and the DNN, and that is stored by the binding support network element.