Communication system, base station and communciation terminal

Abstract

A PDSCH of a legacy UE is mapped to physical resources per subframe, whereas a PDSCH of an LR-UE is mapped, per physical resource block (PRB) included in the subframe, to a region of the physical resources to which the PDSCH of the legacy UE is mapped. The PDSCH of the legacy UE may be also mapped to the physical resources per PRB pair including two physical resource blocks, whereas the PDSCH of the LR-UE may be mapped to the remaining physical resources excluding the PRB pairs to which the PDSCH of the legacy UE is mapped.

1 . (canceled) 
     
     
         2 . A communication system comprising:
 a plurality of communication terminals; and   a base station configured to perform radio communication with each of the plurality of communication terminals,   wherein the plurality of communication terminals include:
 a first communication terminal configured to transmit an uplink data per a transmission time interval that is equal to one subframe; and 
 a second communication terminal configured to transmit an uplink data per a shortened transmission time interval that is shorter than one subframe, and 
   the base station is configured to:
 transmit a response signal to the uplink data received from the first communication terminal to the first communication terminal per the transmission time interval, and 
 transmit a response signal to the uplink data received from the second communication terminal to the second communication terminal per the shortened transmission time interval. 
   
     
     
         3 . The communication system according to  claim 2 ,
 wherein the base station is configured to map a physical channel for transmitting the response signal for the second communication terminal to a physical resource region to which a physical downlink shared channel for the first communication terminal is mapped.   
     
     
         4 . A base station configured to perform radio communication with each of a plurality of communication terminals,
 wherein the plurality of communication terminals include:
 a first communication terminal configured to transmit an uplink data per a transmission time interval that is equal to one subframe; and 
 a second communication terminal configured to transmit an uplink data per a shortened transmission time interval that is shorter than one subframe, and 
   the base station is configured to:
 transmit a response signal to the uplink data received from the first communication terminal to the first communication terminal per the transmission time interval, and 
 transmit a response signal to the uplink data received from the second communication terminal to the second communication terminal per the shortened transmission time interval. 
   
     
     
         5 . A communication terminal configured to perform radio communication with a base station,
 wherein the communication terminal is configured to:
 transmit an uplink data per a shortened transmission time interval that is shorter than one subframe, and 
 receive a response signal to the uplink data to be transmitted from the base station per the shortened transmission time interval.