Service providing system, gateway device, information collection method and non-transitory computer readable medium storing program

A network node comprising at least one memory storing instructions, and at least one processor configured to execute the instructions to:

• receive a request message that requests location information of a User Equipment (UE) from an application server located in an external communication network;
• provide information indicating an error to the application server if the application server is not authorized to send the request message;
• send a request message to a Home Subscriber Server (HSS);
• receive information related to the location information of the UE from the HSS;
• and
• send the location information to the application server,
• wherein the information related to the location information of the UE received by the network node from the HSS includes identification information of a mobility management node (MME) that manages the location information of the UE,
• wherein the at least one processor is further configured to execute the instructions to:
• send a request message to the MME whose identification information is the identification information received from the HSS;
• and
• receive the location information from the MME, and
• wherein the request message sent by the network node to the MME includes information indicating a validity period in which the request message sent to the MME is valid.