USER DEVICE, BASE STATION, AND SWITCHING CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To allow a user device having a function to switch between the communication via a first wireless communication system and the communication via a second wireless communication system to receive DL data of the first wireless communication system when switching to the second wireless communication system.SOLUTION: A base station comprises: means for receiving a switching notification from the user device that has determined to switch from the communication via the first wireless communication system to the communication via the second wireless communication system; and switching instruction means that, upon receiving the switching notification, compares the amount of retained downlink data for the user device with a predetermined threshold to determine whether to allow the user device to switch from the communication via the first wireless communication system to the communication via the second wireless communication system, and transmits a switching instruction to the user device if it has determined to allow the user device to switch.