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User terminal, wireless base station, and wireless communication method

A terminal, terminal receiving technology, applied in wireless communication, multiplexing communication, error prevention/detection using return channel, etc.

Active Publication Date: 2021-08-24
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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: Dual Connectivity) or The stand alone of non-licensed zone may also become the object 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

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Experimental program
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Embodiment Construction

[0036] figure 1 It is an explanatory diagram of carrier aggregation (CA). Such as figure 1 As shown, in CA up to LTE Rel.12, a maximum of 5 (CC#1-CC#5) component carriers (CC) with a specified bandwidth (for example, LTE Rel.8 bandwidth) as the basic unit are bundled. . That is, in CA up to LTE Rel.12, the number of CCs that can be configured for each UE is limited to a maximum of five.

[0037] On the other hand, in the CA of LTE Rel.13, it is being studied to bundle six or more CCs and realize further band extension. That is, in LTE Rel.13 CA, it is being studied to expand the number of CCs (cells) that can be configured per UE to six or more (CA enhancement). For example, if figure 1 As shown, when 32 CCs (CC#1-CC#32) are bundled, it is possible to secure a maximum bandwidth of 640 MHz.

[0038]Therefore, it is expected that more flexible and high-speed wireless communication can be realized by expanding the number of CCs that can be configured for each UE. In additi...

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Abstract

Even when a plurality of component carriers are configured in the wireless communication system, feedback of HARQ-ACK is appropriately performed. A receiving unit that receives DL signals transmitted from a plurality of component carriers (CC: Component Carrier), and a control unit that controls transmission of HARQ-ACK for the received DL signals based on a counter DAI included in downlink control information, The counter DAI is set to 3 bits or more in predetermined downlink control information. In addition, the counter DAI can be configured to use a different number of bits based on the number of CCs set in the user terminal or the number of CCs to which DL transmission application monitoring is applied.

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 the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE: Long Term Evolution) is standardized for the purpose of further increasing high-speed data rate, low delay, etc. (Non-Patent Document 1). In addition, LTE-A (also called LTE Advanced, LTE Rel. Successor systems to LTE (for example, also referred to as FRA (Future Radio Access), 5G (5th generation mobile communication system), LTE Rel.13, etc.) have been studied. [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 to simultaneously use a plurality of carriers for communication. A carrier serving as a basic unit in carrier aggregation is called a component carrier (CC: Compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/04H04J1/00H04J11/00H04L1/16H04W72/04
CPCH04J11/00H04L1/16H04W28/04H04W72/04H04L1/1861H04L5/0055H04L1/1812H04L5/001H04W52/545
Inventor 武田一树永田聪王理惠刘柳蒋惠玲
Owner NTT DOCOMO INC