Communication control method

A processor for controlling a user terminal, the processor communicatively coupled to a memory and configured to:

• control communication by using a first data bearer and a second data bearer, the first data bearer not passing through a Wireless Local Area Network (WLAN) but passing through a cellular base station and the second data bearer passing through the WLAN and the cellular base station;
• receive information from the cellular base station, the information being for the user terminal to transmit a status report indicating a delivery status regarding data received via the WLAN and data directly received from the cellular base station;
• and
• transmit the status report to the cellular base station on a basis of the information,
• wherein the status report includes information indicating whether or not a Packet Data Convergence Protocol Service Data Unit (PDCP SDU) after the first missing PDCP SDU is already received.

A user terminal comprising:

• a processor;
• and
• a memory communicatively coupled to the processor, wherein
• the processor is configured to:
• control communication by using a first data bearer and a second data bearer, the first data bearer not passing through a Wireless Local Area Network (WLAN) but passing through a cellular base station and the second data bearer passing through the WLAN and the cellular base station;
• receive information from the cellular base station, the information being for the user terminal to transmit a status report indicating a delivery status regarding data received via the WLAN and data directly received from the cellular base station;
• and
• transmit the status report to the cellular base station on a basis of the information, and
• the status report includes information indicating whether or not a Packet Data Convergence Protocol Service Data Unit (PDCP SDU) after the first missing PDCP SDU is already received.