Method of informing a network of change of user equipment capability

A method of informing a network of a change of user equipment capability, the method comprising:

• sending, by a user equipment, a register request message carrying information of new user equipment capability to a network so that the network analyzes the register request message, stores the information of new user equipment capability for reference by subsequent establishment of a session;
• stops a current registration timer on a server side set for the user equipment;
• and initiates a new registration timer on the server side for the user equipment;
• receiving, by the user equipment, a response message carrying information of the new registration timer on the server side from the network;
• and resetting, by the user equipment, a registration timer on the user side based on information of the new registration timer on the server side in the response message.

An apparatus, comprising:

• means for receiving a register request message carrying information of new user equipment capability from a user equipment;
• means for analyzing the register request message and storing the information of new user equipment capability for reference by subsequent establishment of a session;
• means for stopping a current registration timer on a server side set for the user equipment;
• means for initiating a new registration timer on the server side for the user equipment;
• and means for sending a response message carrying information of the new registration timer on the server side to the user equipment so as to reset a registration timer on the user side based on information of the new registration timer on the server side in the response message.

A user equipment, comprising:

• means for sending a register request message carrying information of new user equipment capability to a network so that the network analyzes the register request message, stores the information of new user equipment capability for reference by subsequent establishment of a session;
• stops a current registration timer on a server side set for the user equipment;
• and initiates a new registration timer on the server side for the user equipment;
• means for receiving a response message carrying information of the new registration timer on the server side from the network;
• and means for resetting a registration timer on the user side based on information of the new registration timer on the server side in the response message.