Communication system, base station, and user apparatus

Abstract

Provided is a communication system capable of suppressing decrease in a transmission rate. An eNB communicates with a UE using a self-contained subframe. The self-contained subframe includes a downlink signal to be transmitted from the eNB to the UE, and an uplink signal to be transmitted from the UE to the eNB in response to the downlink signal. The uplink signal has a structure including an uplink control signal indicating information for controlling transmission of the uplink signal, and uplink user data to be transmitted before and after the uplink control signal. The eNB notifies the UE of a structure of the uplink signal. The eNB may predetermine scheduling for retransmission to retransmit the downlink signal, before performing initial transmission of the downlink signal.

1 . A communication system comprising:
 a base station; and   a user apparatus configured to perform downlink communication and uplink communication with the base station,   wherein the base station transmits, to the user apparatus, control information related to a gap provided after transmission of an uplink signal by the user apparatus.   
     
     
         2 . The communication system according to  claim 1 , wherein the gap is set in a unit of a symbol in the control information. 
     
     
         3 . The communication system according to  claim 2 , wherein the gap is selected from multiple candidates. 
     
     
         4 . The communication system according to  claim 1 , wherein the control information includes time information that indicates a time until which the gap indicated by the control information is activated. 
     
     
         5 . The communication system according to  claim 1 , wherein the base station dynamically sets the control information to the user apparatus using L1/L2 signalling. 
     
     
         6 . The communication system according to  claim 1 , wherein the gap is set for each type of the uplink communication in the control information. 
     
     
         7 . A base station in a communication system comprising the base station and a user apparatus configured to perform downlink communication and uplink communication with the base station,
 wherein the base station transmits, to the user apparatus, control information related to a gap provided after transmission of an uplink signal by the user apparatus.   
     
     
         8 . A user apparatus in a communication system comprising a base station and the user apparatus configured to perform downlink communication and uplink communication with the base station,
 wherein the user apparatus performs the uplink communication based on control information transmitted from the base station and related to a gap provided after transmission of an uplink signal by the user apparatus.