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User terminal, radio base station and radio communication method

A technology for user terminals and control channels, which is used in wireless communication, signaling distribution, signaling features, etc.

Active Publication Date: 2018-05-11
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In LTE Rel.13, the carrier aggregation (LAA: License-Assisted Access) between the licensed band and the unlicensed band is taken as the research object, but in the future, dual connectivity (DC: DualConnectivity) or not Stand-alone licensed domains may also be the subject of research

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  • User terminal, radio base station and radio communication method
  • User terminal, radio base station and radio communication method
  • User terminal, radio base station and radio communication method

Examples

Experimental program
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Embodiment Construction

[0038] figure 1 It is a diagram explaining an example of a deactivation operation (De-activation) of a secondary cell (SCell) when CA is applied in the conventional LTE system. The user terminal controls the deactivation (deactivation) of the SCell based on the deactivation command for the SCell. Specifically, the user terminal controls the deactivation operation of the SCell based on the reception of the deactivation command (De-activation command) for the SCell notified from the radio base station or the expiration of a predetermined deactivation timer (sCellDeactivationTimer) for controlling the deactivation operation. . A stop command may also be called a deactivation command, a non-set command. The stop timer may also be called a deactivation timer, a non-set timer.

[0039] The user terminal performs control such that a subframe (for example, subframe n+8) after a predetermined period starts from the subframe in which the stop command for the SCell is received or the ...

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Abstract

The purpose of the present invention is to appropriately perform communication even in cases when deactivation is applied to a specific cell which transmits an uplink control channel. A user terminalwhich communicates with a cell group constituted by one or more cells is provided with: a transmission unit which uses an uplink control channel of a specific secondary cell in the cell group to transmit uplink control information; and a control unit which, on the basis of a deactivation command and / or expiration of a deactivation timer for secondary cells, controls deactivation of the secondary cells included in the cell group. The control unit deactivates at least the specific secondary cell within a prescribed period from the subframe in which notification of the deactivation command for the specific secondary cell was issued and / or the subframe in which the deactivation timer expired.

Description

technical field [0001] The present invention relates to a user terminal, a wireless base station and a wireless communication method in the next generation mobile communication system. Background technique [0002] In a UMTS (Universal Mobile Telecommunications System, Universal Mobile Telecommunications System) network, Long Term Evolution (LTE: Long Term Evolution) has been standardized for the purpose of further increasing high-speed data rate, low delay, and the like (Non-Patent Document 1). In addition, LTE-A (also called LTE-Advanced, LTE Rel. 10, 11 or 12) are standardized, and the successor system of LTE (also known as FRA (Future Radio Access, future wireless access), 5G (5th generation mobile communication system, 5th generation mobile communication system), LTE Rel.13, etc.). [0003] In LTE-A, Carrier Aggregation (CA: Carrier Aggregation) is adopted in which a predetermined bandwidth (maximum 20 MHz) is used as a basic unit and communication is performed using ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/10H04W72/04H04W72/12
CPCH04W24/10H04W76/30H04W88/08H04L5/0098H04L5/0055H04L5/0005H04L5/0057H04W72/20H04L1/0026H04L1/1812H04W88/023
Inventor 武田一树内野彻手岛邦彦永田聪
Owner NTT DOCOMO INC