Session configuration method and apparatus

A session configuration method, comprising:

• sending, by a terminal device, a session establishment request to a session management network element, wherein the session establishment request requests to establish a first session;
• and
• receiving, by the terminal device, redundant transmission security information of the first session from an access network device, wherein the redundant transmission security information is indicative of security keys and security policies of the first session and a second session, and the first session and the second session are redundant sessions for redundant transmission of copies of the same data,
• wherein the method further comprises:
• configuring, by the terminal device, the security keys and the security policies for the first session and the second session based on the redundant transmission security information.

A communications apparatus, comprising a receiver and a transmitter, wherein

• the receiver is configured to receive redundant transmission security information of a first session from a session management network element, wherein the redundant transmission security information is indicative of security keys and security policies of the first session and a second session that need to be established by a terminal device, and the first session and the second session are redundant sessions for redundant transmission of copies of the same data;
• and
• the transmitter is configured to send the redundant transmission security information to the terminal device,
• wherein the apparatus further comprises a processor configured to, after the receiver receives the redundant transmission security information of the first session from the session management network element, configure the security keys and the security policies for the first session and the second session based on the redundant transmission security information.