User terminal and radio communication method

Patent metadata

Field	Value
Publication number	US-11528696-B2
Application number	US-201816962965-A
Country	US
Kind code	B2
Filing date	Jan 19, 2018
Priority date	Jan 19, 2018
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

A terminal is disclosed including a receiver that receives a downlink shared channel scheduled by downlink control information; and a processor that, when the terminal is configured with a semi-statically determined first codebook and only one downlink shared channel reception is scheduled in a primary cell, controls transmission of a transmission acknowledgement signal in response to the only one downlink shared channel reception, wherein the transmission acknowledgement signal is determined from a second codebook that is different from the first codebook and corresponds only to the only one downlink shared channel. In other aspects, a radio communication method for a terminal and a base station in communication with a terminal are also disclosed.

First claim

What is claimed is:

1. A terminal comprising:
a receiver that receives a downlink shared channel scheduled by downlink control information; and
a processor that controls transmission of a transmission acknowledgement signal in response to the downlink shared channel reception,
wherein, when the terminal is configured with a semi-statically determined codebook, the processor determines whether to use a first codebook or a second codebook as the codebook for the transmission acknowledgement signal, and
wherein the first codebook is determined when a number of the downlink shared channel receptions in a time domain is greater than one, and the second codebook is determined when the number of the downlink shared channel receptions in the time domain is only one and the downlink shared channel is scheduled in a primary cell.

2. The terminal according to claim 1 , wherein, when using the second codebook, the processor controls transmission of the transmission acknowledgement signal by using a given physical uplink control channel (PUCCH) resource set.

3. A radio communication method for a terminal, comprising:
receiving a downlink shared channel scheduled by downlink control information;
controlling transmission of a transmission acknowledgement signal in response to the downlink shared channel reception; and
when the terminal is configured with a semi-statically determined codebook, determining whether to use a first codebook or a second codebook as the codebook for the transmission acknowledgement signal,
wherein the first codebook is determined when a number of the downlink shared channel receptions in a time domain is greater than one, and the second codebook is determined when the number of the downlink shared channel receptions in the time domain is only one and the downlink shared channel is scheduled in a primary cell.

4. A base station in communication with a terminal, the base station comprising:
a transmitter that transmits to the terminal a downlink shared channel scheduled by downlink control information; and
a receiver that receives from the terminal a transmission acknowledgement signal in response to the downlink shared channel reception,
wherein, when the terminal is configured with a semi-statically determined codebook, whether to use a first codebook or a second codebook as the codebook for the transmission acknowledgement signal is determined, and
wherein the first codebook is determined when a number of the downlink shared channel receptions in a time domain is greater than one, and the second codebook is determined when the number of the downlink shared channel receptions in the time domain is only one and the downlink shared channel is scheduled in a primary cell.

5. A system comprising a terminal and a base station, wherein:
the terminal comprises:
a receiver that receives a downlink shared channel scheduled by downlink control information; and
a processor that controls transmission of a transmission acknowledgement signal in response to the downlink shared channel reception,
wherein, when the terminal is configured with a semi-statically determined codebook, the processor determines whether to use a first codebook or a second codebook as the codebook for the transmission acknowledgement signal, and
wherein the first codebook is determined when a number of the downlink shared channel receptions in a time domain is greater than one, and the second codebook is determined when the number of the downlink shared channel receptions in the time domain is only one and the downlink shared channel is scheduled in a primary cell, and

the base station comprises:
a transmitter that transmits to the terminal the downlink shared channel; and
a receiver that receives from the terminal the transmission acknowledgement signal.

Assignees

• Ntt Docomo Inc

Inventors

• Takeda Kazuki
• Matsumura Yuki
• Nagata Satoshi
• Wang Lihui
• Hou Xiaolin

Classifications

• H04W72/23 Primary

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

• H04W28/04

  Error control · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L1/1861 Primary

  Physical mapping arrangements (for ACK signaling see also H04L5/0053) · CPC title

• H04L1/1825

  Adaptation of specific ARQ protocol parameters according to transmission conditions · CPC title