TERMINAL DEVICE, METHOD, AND INTEGRATED CIRCUIT

To provide a technique (UE-to-UE relay) in which another terminal joins between terminal devices so as to support communication between the terminal devices.SOLUTION: In a communication system, a terminal device that communicates with a first terminal device and a second terminal device serves to relay communication between the first terminal device and the second terminal device, and includes a processing unit that measures sidelink reference signal received power (SL-RSRP) in communication with the first terminal device and in communication with the second terminal device, and a transmitting unit. The processing unit determines whether the two SL-RSRPs are greater than or equal to a threshold value, and notifies the first terminal device that the first terminal device and the second terminal device are in close proximity when determining that the two SL-RSRPs are greater than or equal to the threshold value, and does not notify the first terminal device that the first terminal device and the second terminal device are in close proximity when determining that the two SL-RSRPs are not greater than or equal to the threshold value.SELECTED DRAWING: Figure 1 【課題】端末装置間に他の端末装置が加わり、端末装置間の通信をサポートする技術（ＵＥ－ｔｏ－ＵＥ ｒｅｌａｙ）を提供すること。【解決手段】通信システムにおいて、第１の端末装置および第２の端末装置と通信する端末装置は、第１の端末装置と第２の端末装置の通信を中継する役割を果たし、第１の端末装置との通信および第２の端末装置との通信においてサイドリンク用参照信号受信電力（ＳＬ－ＲＳＲＰ）を測定する処理部と、送信部と、を備える。処理部は、２のＳＬ－ＲＳＲＰが閾値以上であるか否かを判断し、２つのＳＬ－ＲＳＲＰが閾値以上であると判断した場合、第１の端末装置と第２の端末装置とが近接していることを、第１の端末装置に通知し、２つのＳＬ－ＲＳＲＰが閾値以上でないと判断した場合、第１の端末装置と第２の端末装置とが近接していることを、第１の端末装置に通知しない。【選択図】図１