USER APPARATUS AND SOFT BUFFER SIZE DETERMINATION METHOD

摘要

A user apparatus configured to perform communication with a base station in a mobile communication system that supports downlink spatial multiplexing, including transmission means configured to transmit category information of the user apparatus to the base station; reception means configured to receive configuration information from the base station; soft buffer size determination means configured, if the category information is a value equal to or greater than a predetermined value and if a parameter indicating a transmission mode corresponding to the downlink spatial multiplexing and predetermined additional information are received as the configuration information, to determine a soft buffer size used for downlink data reception processing in the user apparatus by using the total number of soft channel bits corresponding to the category information.