User apparatus and soft buffer size determination method

Abstract

A user apparatus configured to perform communication with a base station in a mobile communication system that supports downlink spatial multiplexing such that the user apparatus includes a transmitter that transmits category information of the user apparatus to the base station and a receiver that receives configuration information from the base station. 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, a processor determines 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.

Dependencies are inferred from the claim text.