Method and apparatus for positioning based on validity information in mobile wireless communication system

A wireless device comprising:

• a transceiver,
• a memory, and
• a controller coupled to the transceiver and the memory, wherein the controller is configured to cause the wireless device to:
• receive a System Information (SI), wherein the SI comprises a first positioning reference signal (PRS) data, wherein the first PRS data comprises:
• configuration information of one or more nr-DL-PRS-ResourceSet;
• and
• a first identifier;
• transmit to a base station a first message to report capability relating to PRS,
• transmit, to Location Management Function (LMF) and based on the SI, a second message to request assistance data, wherein the second message comprises:
• a physical cell identity of Primary Cell (PCell);
• and
• the first identifier related to the first PRS data;
• receive from the LMF a third message containing a second PRS data, wherein the second PRS data comprises:
• one or more nr-DL-PRS-ResourceSet;
• a second identifier;
• and
• one or more third identifiers;
• determine, based on the one or more third identifiers, to perform measurement based on the one or more nr-DL-PRS-ResourceSet, and
• transmit to the LMF a fourth message to report positioning measurement result, wherein the third identifier comprises a base station identifier.