Terminal and radio communication method using a plurality of waveforms

Patent metadata

Field	Value
Publication number	US-11330528-B2
Application number	US-201716469410-A
Country	US
Kind code	B2
Filing date	Dec 14, 2017
Priority date	Dec 15, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Communication is suitably continued even when communication is performed by using a plurality of waveforms. A user terminal according to one aspect of the present invention includes: a transmission section that transmits a first signal and a second signal by using respectively different radio resources, the first signal conforming to a first transmission scheme-based waveform and the second signal conforming to a second transmission scheme-based waveform; and a control section that performs transmit power control on a signal to be transmitted.

First claim

The invention claimed is:

1. A terminal comprising:
a processor that controls transmit power of an uplink signal; and
a transmitter that transmits either of a first uplink signal conforming to a first transmission scheme-based waveform and a second uplink signal conforming to a second transmission scheme-based waveform based on the transmit power,
wherein when the uplink signal is switched between the first uplink signal and the second uplink signal, the processor updates a correction value based on a Transmit Power Control (TPC) command after switching, by using a correction value immediately before the switching.

2. The terminal according to claim 1 , wherein the processor controls the transmit power by using permitted maximum transmit power that is different between the first uplink signal and the second uplink signal.

3. The terminal according to claim 1 , wherein the processor computes a power headroom based on a signal to transmit.

4. The terminal according to claim 2 , wherein the processor computes a power headroom based on a signal to transmit.

5. The terminal according to claim 1 , wherein the processor computes a power headroom by using permitted maximum transmit power that is different between the first uplink signal and the second uplink signal.

6. The terminal according to claim 2 , wherein the processor computes a power headroom by using permitted maximum transmit power that is different between the first uplink signal and the second uplink signal.

7. The terminal according to claim 3 , wherein the processor computes a power headroom by using permitted maximum transmit power that is different between the first uplink signal and the second uplink signal.

8. The terminal according to claim 1 , wherein the processor computes a power headroom by using the correction value.

9. The terminal according to claim 2 , wherein the processor computes a power headroom by using the correction value.

10. The terminal according to claim 3 , wherein the processor computes a power headroom by using the correction value.

11. The terminal according to claim 5 , wherein the processor computes a power headroom by using the correction value.

12. The terminal according to claim 1 , wherein the first transmission scheme-based waveform corresponds to a Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM)-based waveform and the second transmission scheme-based waveform corresponds to a Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM)-based waveform.

13. A radio communication method for a terminal, comprising:
controlling transmit power of an uplink signal; and
transmitting either of a first uplink signal conforming to a first transmission scheme-based waveform and a second uplink signal conforming to a second transmission scheme-based waveform based on the transmit power,
wherein when the uplink signal is switched between the first uplink signal and the second uplink signal, the terminal updates a correction value based on a Transmit Power Control (TPC) command after switching, by using a correction value immediately before the switching.

14. A system comprising:
a terminal that comprises:
a processor that controls transmit power of an uplink signal; and
a transmitter that transmits either of a first uplink signal conforming to a first transmission scheme-based waveform and a second uplink signal conforming to a second transmission scheme-based waveform based on the transmit power,
wherein when the uplink signal is switched between the first uplink signal and the second uplink signal, the processor updates a correction value based on a Transmit Power Control (TPC) command after switching, by using a correction value immediately before the switching; and

a base station that comprises:
a receiver that receives either of the first uplink signal and the second uplink signal.

Assignees

• Ntt Docomo Inc

Inventors

• Osawa Ryosuke
• Takeda Kazuki
• Kakishima Yuichi

Classifications

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04W52/262

  taking into account adaptive modulation and coding [AMC] scheme · CPC title

• H04W52/365 Primary

  Power headroom reporting · CPC title

• H04L27/26

  Systems using multi-frequency codes (H04L27/32 takes precedence) · CPC title

• H04W52/146 Primary

  Uplink power control · CPC title