User apparatus, base station, and communication method

Patent metadata

Field	Value
Publication number	US-2016352403-A1
Application number	US-201515116348-A
Country	US
Kind code	A1
Filing date	Feb 2, 2015
Priority date	Feb 7, 2014
Publication date	Dec 1, 2016
Grant date	—

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.

First claim

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.

Assignees

• Ntt Docomo Inc

Inventors

• Kishiyama Yoshihisa
• Kakishima Yuichi

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/21 Primary

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W84/042

  Public Land Mobile systems, e.g. cellular systems · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H04L5/0023

  Time-frequency-space · CPC title