Radio terminal apparatus, radio base station apparatus, mobility management apparatus, radio transmission method, radio communication method, and mobility management method

Abstract

Communication efficiency is improved in a case of using a grant-less communication scheme and a grant-based scheme. A radio terminal apparatus for communicating with a radio base station apparatus, which includes a transmitter configured to transmit a signal to the radio base station apparatus, a receiver configured to receive a signal from the radio base station, and a controller configured to control the transmitter and the receiver. The controller is capable of selecting both a grant-based scheme and a grant-less communication scheme to transmit user data. In a case of transmitting the user data by using the grant-less communication scheme and adding a session identifier for identifying the radio terminal apparatus, a transmission of at least two parts that include a first part including the session identifier and a second part including the user data is performed at a time. First information for detecting an error in receiving the first part and second information for detecting an error in receiving the second part are added at the time of the transmission, regardless of the error in receiving the second part, and an amount of the first information and an amount of the second information are different from each other.