Communication system

Abstract

A communication system that can reduce latency while preventing reduction in a transmission rate. An eNB communicates with a UE #1 using a self-contained subframe including a first downlink signal (DL #1) and a first uplink signal (UL #1), and with a UE #2 using a self-contained subframe including a second downlink signal (DL #2) and a second uplink signal (UL #2). The self-contained subframe for the UE #1 includes a first gap duration (Gap #1) during which neither the DL #1 nor the UL #1 is transmitted, between transmission durations of the DL #1 and the UL #1. The self-contained subframe for the UE #2 includes a second gap duration (Gap #2) during which neither the DL #2 nor the UL #2 is transmitted, between transmission durations of the DL #2 and the UL #2. The Gaps #1 and #2 are set to each UE.

1 . A communication system comprising at least one base station device and a plurality of communication terminal devices capable of radio communication with the at least one base station device,
 wherein the at least one base station device communicates with each of the plurality of communication terminal devices using a self-contained subframe, the self-contained subframe including a downlink signal transmitted from the at least one base station device to the communication terminal device, and an uplink signal transmitted from the communication terminal device to the at least one base station device in response to the downlink signal,   the self-contained subframe includes a gap duration during which neither the downlink signal nor the uplink signal is transmitted, between a downlink transmission duration during which the downlink signal is transmitted and an uplink transmission duration during which the uplink signal is transmitted,   the gap duration is set to each of the plurality of communication terminal devices, and   the self-contained subframe includes, in a frequency axis direction, a free space in which neither the downlink signal nor the uplink signal is transmitted, between a frequency domain in which the downlink signal is transmitted and a frequency domain in which the uplink signal is transmitted when the uplink transmission duration and the downlink transmission duration have an overlapping duration.   
     
     
         2 . The communication system according to  claim 1 ,
 wherein the at least one base station device includes a first base station device, and a second base station device that is a surrounding base station device for the first base station device, and   the first base station device obtains information on the second base station device.   
     
     
         3 . The communication system according to  claim 2 ,
 wherein the information includes information on a frequency to be used by the second base station device.