Optimization of packet transmission paths

A method for a first network node in a mobile communication network including a mobile station that supports a specific service related to connectivity provided by the mobile communication network, and a second network node that connects to an external network, the method comprising:

• receiving, from the mobile station, a registration request message and an authentication request message;
• and
• determining the specific service by using information that is provided from the mobile station and indicates that the mobile station is configured to support the specific service;
• and
• selecting the second network node for the mobile station supporting the specific service, when the first network node determines the specific service.

A method for a mobile station in a mobile communication network including a first network node, and a second network node that connects to an external network, the method comprising:

• supporting a specific service related to connectivity provided by the mobile communication network;
• storing an Access Point Name (APN) and information indicating that the mobile station is configured to support the specific service;
• and
• sending a registration request message and an authentication request message to the first network node that determines the specific service by using the information provided from the mobile station and selects the second network node for the mobile station supporting the specific service, when the first network node determines the specific service.