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User terminal and wireless communication method

A user terminal, signal technology, applied in wireless communication, error prevention/detection using return channel, error prevention/detection through transmission repetition, etc.

Pending Publication Date: 2021-11-26
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in the existing LTE system, when UL synchronization is established between the radio base station and the user terminal, transmission of UL data from the user terminal becomes possible

Method used

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  • User terminal and wireless communication method
  • User terminal and wireless communication method
  • User terminal and wireless communication method

Examples

Experimental program
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Embodiment Construction

[0029] In existing LTE systems (eg, LTE Rel. 8-13), a random access procedure for establishing UL synchronization is supported. The random access process includes contention-based random access (also called contention-based random access (Contention-Based Random Access (CBRA)), etc.) and non-contention-based random access (also called non-CBRA (Non-CBRA), Contention-Free Random Access (CFRA), etc.).

[0030] In contention-based random access (CBRA), the user terminal sends multiple preambles defined for each cell (also called random access preamble, random access channel (Physical Random Access Channel (Physical Random Access Channel) PRACH))), RACH preamble, etc.) randomly selected preamble. In addition, contention-type random access is a random access process led by the user terminal, for example, it can be used for initial access, start or restart of UL transmission, and the like.

[0031] On the other hand, in non-contention-type random access (Non-CBRA, CFRA), the radio...

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Abstract

In order to suitably perform communication in fewer steps than the existing art even when performing a random access procedure, one embodiment of this user terminal has: a transmission unit that transmits a UL signal including a random access preamble and a prescribed message; a reception unit that receives a DL signal transmitted in response to the UL signal; and a control unit that determines whether to retransmit the UL signal on the basis of the period since receiving the DL signal, the content of the instruction in the DL signal, and the content of at least one bit field set in a downlink control channel included in the DL signal.

Description

technical field [0001] The present disclosure relates to a user terminal and a wireless communication method in a next generation mobile communication system. Background technique [0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized for the purpose of further high-speed data rate, low delay, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing capacity and upgrading from LTE (Third Generation Partnership Project (3GPP) version (Release (Rel.)) 8, 9) . [0003] The successor system of LTE (for example, also called the 5th generation mobile communication system (5G)), 5G+ (5G plus), New Radio (New Radio (NR)), 3GPP Rel.15 and later, etc. ). [0004] In an existing LTE system (for example, LTE Rel.8-13), a user terminal (User Equipment (UE: User Equipment)) is based on downlink control information (also called Downlink Control Infor...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04L1/16H04W28/04
CPCH04W74/0833H04L1/1819H04L1/1896H04L1/1887H04L1/08H04W74/004H04W72/23
Inventor 武田一树永田聪王理惠
Owner NTT DOCOMO INC