USER TERMINAL, RADIO BASE STATION AND RADIO COMMUNICATION METHOD

• US 20180167169A1
• Filed: 02/07/2018
• Published: 06/14/2018
• Est. Priority Date: 08/13/2015
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Takeda, Kazuaki, Jiang, Huiling, Liu, Liu, Mu, Qin
• Application Number:
  US15/891,255
• Publication Number:
  US 20180167169A1
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A user terminal is disclosed that has a receiver that receives transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle and a processor that controls retransmission of the uplink data channel based on the transmission acknowledgment information. Further, a radio base station is disclosed that communicates with a user terminal. The radio base station has a transmitter that transmits transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle and a processor that controls transmission of the transmission acknowledgment information. The feedback timing for the transmission acknowledgment information is adjusted based on the starting subframe.

Claims

1. A user terminal, comprising:

a receiver that receives transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle; and

a processor that controls retransmission of the uplink data channel based on the transmission acknowledgment information,

wherein a feedback timing of the transmission acknowledgment information is adjusted based on the starting subframe.

2. The user terminal according to claim 1, wherein a cycle of the starting subframe is determined based on the number of repetitions of the downlink control channel.

3. The user terminal according to claim 2, wherein the number of repetitions is reported by using higher layer signaling.

4. The user terminal according to claim 1, wherein:

the receiver receives downlink control information, which contains the transmission acknowledgment information, via the downlink control channel; and

the processor controls the retransmission of the uplink data channel in a second narrow band specified by the downlink control information.

5. The user terminal according to claim 1, wherein the narrow band is comprised of six resource blocks.

8. The user terminal according to claim 2, wherein:

the receiver receives downlink control information, which contains the transmission acknowledgment information, via the downlink control channel; and

the processor controls the retransmission of the uplink data channel in a second narrow band specified by the downlink control information.

9. The user terminal according to claim 3, wherein:

the receiver receives downlink control information, which contains the transmission acknowledgment information, via the downlink control channel; and

the processor controls the retransmission of the uplink data channel in a second narrow band specified by the downlink control information.

10. The user terminal according to claim 2, wherein the narrow band is comprised of six resource blocks.

11. The user terminal according to claim 3, wherein the narrow band is comprised of six resource blocks.

12. The user terminal according to claim 4, wherein the narrow band is comprised of six resource blocks.

6. A radio base station that communicates with a user terminal, the radio base station comprising:

a transmitter that transmits transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle; and

a processor that controls transmission of the transmission acknowledgment information,

wherein the processor controls a feedback timing for the transmission acknowledgment information based on the starting subframe.

7. A radio communication method to allow a user terminal and a radio base station to communicate, the radio communication method comprising, in the user terminal, the steps of:

receiving transmission acknowledgment information, in response to an uplink data channel in a narrow band in a system band, via a downlink control channel that is transmitted in a starting subframe of a predetermined cycle; and

controlling retransmission of the uplink data channel based on the transmission acknowledgment information,

wherein a feedback timing for the transmission acknowledgment information is adjusted based on the starting subframe.