Communication system

Abstract

Provided is a communication system capable of suppressing increase in the power consumption of a communication terminal device, degradation in the communication quality, and reduction in the use efficiency of radio resources. A base station device (gNB) notifies a communication terminal device (UE) of information on the next reception timing. The UE receives, for example, a downlink control signal (902) in a subframe (901). The UE obtains, from the downlink control signal (902), information on a piece of user data (903) in the subframe (901), and the information (904) on the next reception timing. The UE transmits and receives the piece of user data (903) to and from the gNB. The information (904) on the next reception timing indicates a subframe (905) as the next reception timing of the UE. The UE receives a downlink control signal (906) in the subframe (905).

1 . A communication system comprising a base station device and at least one communication terminal device capable of radio communication with the base station device,
 wherein the base station device notifies the communication terminal device of information on a next reception timing, and   the communication terminal device performs reception based on the information on the next reception timing that has been notified from the base station device.   
     
     
         2 . The communication system according to  claim 1 ,
 wherein the base station device and the communication terminal device perform transmission and reception by switching directivity of a beam emitted from an antenna.