User apparatus and transmission power control method

Patent metadata

Field	Value
Publication number	US-11601892-B2
Application number	US-201716644413-A
Country	US
Kind code	B2
Filing date	Sep 8, 2017
Priority date	Sep 8, 2017
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A user apparatus in a wireless communication system including a base station and a user apparatus, includes a signal reception part that receives, from the base station, a plurality of power control parameters that become candidates for power control parameters to be used by the user apparatus, a transmission power determination part that selects power control parameters to be used, from the plurality of power control parameters, and determines a transmission power of a UL signal, based on the selected power control parameters and a pathloss estimation value, and a signal transmission part that transmits the UL signal using the transmission power determined by the transmission power determination part.

First claim

The invention claimed is:

1. A terminal comprising:
a receiver that receives a plurality of parameters that become candidates of a parameter to be used;
a processor that selects a parameter to be used, from the plurality of parameters, determines a pathloss estimation value using the selected parameter, and determines a transmission power of an uplink (UL) signal based on the pathloss estimation value; and
a transmitter that transmits the UL signal using the transmission power determined by the processor,
wherein the processor determines the parameter to be used from the plurality of parameters based on a Medium Access Control (MAC) signaling, and
wherein the UL signal, subject to the transmission power determination, is a Sounding Reference Signal (SRS) that is used for crosslink interference measurement.

2. The terminal as claimed in claim 1 , wherein the receiver receives the plurality of parameters configured for each beam.

3. A base station comprising:
a transmitter that transmits a plurality of parameters that become candidates of a parameter to be used;
a receiver that receives an uplink (UL) signal transmitted from a terminal using a transmission power that is determined based on a pathloss estimation value, wherein a parameter to be used is selected from the plurality of parameters and the pathloss estimation value is determined using the selected parameter,
wherein the parameter to be used from the plurality of parameters is determined based on a Medium Access Control (MAC) signaling, and
wherein the UL signal, subject to the transmission power determination, is a Sounding Reference Signal (SRS) that is used for crosslink interference measurement.

4. A radio communication system comprising:
a terminal that comprises:
a first receiver that receives a plurality of parameters that become candidates of a parameter to be used;
a processor that selects a parameter to be used, from the plurality of parameters, determines a pathloss estimation value using the selected parameter, and determines a transmission power of an uplink (UL) signal based on the pathloss estimation value; and
a first transmitter that transmits the UL signal using the transmission power determined by the processor,
wherein the processor determines the parameter to be used from the plurality of parameters based on a Medium Access Control (MAC) signaling, and
wherein the UL signal, subject to the transmission power determination, is a Sounding Reference Signal (SRS) that is used for crosslink interference measurement, and

a base station that comprises:
a second transmitter that transmits the plurality of parameters; and
a second receiver that receives the UL signal.

5. An uplink (UL) signal transmission method executed by a terminal, comprising:
receiving a plurality of parameters that become candidates of a parameter to be used;
selecting a parameter to be used, from the plurality of parameters, determining a pathloss estimation value using the selected parameter, and determining a transmission power of an UL signal based on the pathloss estimation value;
transmitting the UL signal using the determined transmission power; and
determining the parameter to be used from the plurality of parameters based on a Medium Access Control (MAC) signaling,
wherein the UL signal, subject to the transmission power determination, is a Sounding Reference Signal (SRS) that is used for crosslink interference measurement.

Assignees

• Ntt Docomo Inc

Inventors

• Yasukawa Shinpei
• Nagata Satoshi
• Osawa Ryosuke
• Guo Shaozhen

Classifications

• H04W52/36

  with a discrete range or set of values, e.g. step size, ramping or offsets · CPC title

• H04W52/247

  where the output power of a terminal is based on a path parameter sent by another terminal · CPC title

• H04W52/242 Primary

  taking into account path loss · CPC title

• H04W52/325

  Power control of control or pilot channels · CPC title

• H04W52/16

  Deriving transmission power values from another channel · CPC title