Apparatus and method of discarding logged measurement in wireless communication system

An apparatus of discarding logged measurements in a wireless communication system, the apparatus comprising:

• a radio frequency unit for transmitting and receiving radio signals;
• and
• a processor operatively coupled with the radio frequency unit and configured for:
• receiving, from a network, a first measurement configuration;
• upon receiving the first measurement configuration, starting a timer based on a first value set by the first measurement configuration;
• receiving, from the network, a second measurement configuration;
• upon receiving the second measurement configuration, discarding the first measurement configuration and starting the timer based on a second value set by the second measurement configuration;
• logging measurements based on the second measurement configuration;
• upon an expiry of the timer, discarding the second measurement configuration;
• and
• discarding the logged measurements after a certain time period from the expiry of the timer.