First base station, second base station, method, program, and recording medium

A second base station comprising:

• a memory storing instructions;
• and
• one or more processors configured to execute the instructions to:
• execute processing for a Packet Data Convergence Protocol (PDCP) layer;
• receive, from a first base station performing processing in a Radio Link Control (RLC) layer for the terminal apparatus, information for controlling a downlink data flow in the RLC, before a connection between the first base station detects and the terminal apparatus is performed;
• and
• coordinate the processing for the PDCP layer and processing of receiving the information, with the first base station.

A method comprising:

• obtaining information for controlling a downlink data flow in a Radio Link Control (RLC) layer for a terminal apparatus;
• and
• transmitting the information for controlling the downlink data flow to a second base station performing processing for a Packet Data Convergence Protocol (PDCP) layer for the terminal apparatus, before a connection between the first base station and the terminal apparatus is performed;
• and
• coordinating processing of obtaining the information and processing of transmitting the information, with the second base station.