User apparatus, base station, and communication method

Abstract

A user apparatus configured to perform communication with a base station in a radio communication including the base station and the user apparatus, including: a transmission unit configured to transmit a plurality of uplink signals by a plurality of antenna ports or beams; and a reception unit configured to receive, from the base station that monitors the plurality of uplink signals, identification information of a specific uplink signal received by the base station; wherein the transmission unit transmits a data signal using an antenna port or a beam corresponding to an uplink signal that is identified by the identification information received by the reception unit.

1 . A user apparatus configured to perform communication with a base station in a radio communication including the base station and the user apparatus, comprising:
 a transmission unit configured to transmit a plurality of uplink signals by a plurality of antenna ports or beams; and   a reception unit configured to receive, from the base station that monitors the plurality of uplink signals, identification information of a specific uplink signal received by the base station;   wherein the transmission unit transmits a data signal using an antenna port or a beam corresponding to an uplink signal that is identified by the identification information received by the reception unit.   
     
     
         2 . The user apparatus as claimed in  claim 1 , wherein the reception unit is configured to monitor downlink reference signals transmitted by a plurality of antenna ports or beams from the base station, and the transmission unit is configured to transmit an uplink signal including identification information of a specific downlink reference signal received by the reception unit. 
     
     
         3 . The user apparatus as claimed in  claim 1 , wherein the uplink signal is mapped to continuous OFDM symbols in a subframe for each antenna port or each beam. 
     
     
         4 . A base station configured to perform communication with a user apparatus in a radio communication system including the base station and the user apparatus, comprising:
 a transmission unit configured to transmit a plurality of downlink reference signals by a plurality of antenna ports or beams; and   a reception unit configured to receive, from the user apparatus that monitors the plurality of downlink reference signals, an uplink signal including identification information of a specific downlink reference signal received by the user apparatus;   wherein the transmission unit is configured to transmit control information to the user apparatus by using an antenna port or a beam corresponding to a downlink reference signal that is identified by the identification information received by the reception unit.   
     
     
         5 . The base station as claimed in  claim 4 , wherein the control information includes assignment information of a radio resource for the user apparatus to transmit an uplink data signal. 
     
     
         6 . The base station as claimed in  claim 4 , wherein, a plurality of uplink signals are transmitted from the user apparatus by a plurality of antenna ports or beams, and the transmission unit is configured to transmit, to the user apparatus, together with the control information, identification information of a specific uplink signal received by the reception unit from among the plurality of uplink signals. 
     
     
         7 . A communication method executed by a user apparatus configured to perform communication with a base station in a radio communication including the base station and the user apparatus, comprising:
 a step of transmitting a plurality of uplink signals by a plurality of antenna ports or beams;   a step of receiving, from the base station that monitors the plurality of uplink signals, identification information of a specific uplink signal received by the base station; and   a step of transmitting a data signal using an antenna port or a beam corresponding to an uplink signal that is identified by the identification information.   
     
     
         8 . A communication method executed by a base station configured to perform communication with a user apparatus in a radio communication system including the base station and the user apparatus, comprising:
 a step of transmitting a plurality of downlink reference signals by a plurality of antenna ports or beams;   a step of receiving, from the user apparatus that monitors the plurality of downlink reference signals, an uplink signal including identification information of a specific downlink reference signal received by the user apparatus; and   a step of transmitting control information to the user apparatus by using an antenna port or a beam corresponding to a downlink reference signal that is identified by the identification information.   
     
     
         9 . The user apparatus as claimed in  claim 2 , wherein the uplink signal is mapped to continuous OFDM symbols in a subframe for each antenna port or each beam. 
     
     
         10 . The base station as claimed in  claim 5 , wherein, a plurality of uplink signals are transmitted from the user apparatus by a plurality of antenna ports or beams, and the transmission unit is configured to transmit, to the user apparatus, together with the control information, identification information of a specific uplink signal received by the reception unit from among the plurality of uplink signals.