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User terminal, wireless base station and wireless communication method

A terminal and base station technology, applied in wireless communication, signaling distribution, signaling features, etc.

Active Publication Date: 2021-07-13
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

Method used

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

Examples

Experimental program
Comparison scheme
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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

Even when a deactivation operation (de-activation) is applied to a specific cell that transmits an uplink control channel, communication is properly performed. A user terminal communicating with a cell group composed of one or more cells, which has: a sending unit, which uses an uplink control channel of a specific secondary cell in the cell group to send uplink control information; and, a control unit, It controls the deactivation (de-activation) of the secondary cells contained in the cell group based on the deactivation command to the secondary cell and / or the expiration of the deactivation timer; At least the specific secondary cell is stopped within a predetermined period from the subframe in which the cell is notified of the stop command and / or the subframe in which the stop timer expires.

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 Patents(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