Charging method and related device

A charging method, wherein the method is applied to a charging trigger function CTF entity, and comprises:

• sending a charging request to a first relay charging function R-CHF entity, wherein
• when the charging request is an R-CHF removal request on a premise that a charging resource has been established between the first relay charging function R-CHF entity and a primary CHF entity, the R-CHF removal request comprises a removal indication, the removal indication is used for the first R-CHF to return related information of a second charging resource generated by the primary CHF entity, and the primary CHF entity provides online quota management and charging data record generation;
• and
• the method further comprises:
• receiving a removal response message sent by the first R-CHF entity, wherein the removal response message comprises the related information of the second charging resource generated by the primary CHF entity, and the related information comprises an identifier of the second charging resource;
• and
• sending a third charging request to the primary CHF based on the identifier of the second charging resource, wherein the third charging request is an operation request of the second charging resource.

A first R-CHF entity, comprising a processor and a memory, wherein the memory is configured to store program code, and the processor is configured to execute the program code, to implement:

• receiving a first charging request from a charging trigger function CTF entity, wherein the first charging request is used to request to create, update, or release a first charging resource;
• sending a second charging request to a primary CHF entity based on the first charging request, wherein the second charging request is used to request to create, update, or release a second charging resource, and the primary CHF entity provides online quota management and charging data record generation;
• receiving a second charging response message that is sent by the primary CHF entity in response to the second charging request, wherein the second charging response message comprises third capability information, and the third capability information is capability information that is determined by the primary CHF entity based on the second charging request and that is used for interaction between the primary CHF entity and the first R-CHF entity;
• and
• generating, based on the second charging response message, a first charging response message in response to the first charging request, and sending the first charging response message to the CTF entity, wherein the first charging response message comprises fourth capability information, and the fourth capability information is capability information that is determined by the first R-CHF based on the third capability information and that is used for interaction between the first R-CHF entity and the CTF entity.