METHOD AND APPARATUS FOR TRIGGERING AND CANCELING POWER HEADROOM REPORT (PHR) IN SMALL DATA TRANSMISSION PROCEDURE IN A WIRELESS COMMUNICATION SYSTEM

摘要

A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE triggers a Power Headroom Report (PHR) when the UE is in Radio Resource Control (RRC) inactive state. The UE determines whether or not to cancel the PHR based upon whether or not an uplink (UL) resource for transmission in the RRC inactive state can accommodate first pending data available for transmission.