REPORTING OF POWER LIMIT IN COMMUNICATION SYSTEM USING CARRIER AGGREGATION

摘要

PROBLEM TO BE SOLVED: To provide a method of recognizing a power using state of user equipment by a base station device in a mobile communication system using aggregation of a component carrier.SOLUTION: When user equipment is under a condition near to a condition that the maximum total UE transmission power of the user equipment is used or exceeds the condition, the user equipment reports this fact to a base station device. The user equipment makes one or more indicators or a new MAC control element for supplying power state information to the base station device or both the indicators and the MAC control element be contained in one or plural protocol data units to be transmitted on each component carrier in one sub frame, whereby the above report is performed. The MAC control element reports the power headroom per user device. Or, the MAC control element reports the power headroom per component carrier or a power reduction amount applied to each uplink component carrier, or both the power headroom and the power reduction amount.