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User terminal, wireless base station, and wireless communication method

A user terminal, wireless communication technology, used in wireless communication, signaling distribution, duplex signal operation, etc.

Active Publication Date: 2022-04-12
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, carrier aggregation (LAA: Authorized Assisted Access) between licensed band and unlicensed band is taken as the research object, but in the future, dual connectivity (DC: Dual Connectivity) or the independence of unlicensed band It is also possible to be a research object

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

[0040] figure 1 It is an explanatory diagram of carrier aggregation (CA). Such as figure 1As shown, in CA up to LTE Rel.12, a maximum of five component carriers (CCs) (CC#1 to CC#5) are bundled with a predetermined bandwidth (for example, the bandwidth of LTE Rel.8) as the basic unit. . 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.

[0041] On the other hand, in CA of LTE Rel.13, it is being studied to realize further band expansion by bundling six or more CCs. That is, in CA of LTE Rel.13, it is being studied to expand the number of CCs (cells) that can be configured for each UE to six or more (CA enhancement). For example, if figure 1 As shown, in the case of bundling 32 CCs (CC#1 to CC#32), a maximum bandwidth of 640 MHz can be secured.

[0042] In this way, it is expected to realize more flexible and high-speed wireless communication by expanding the number of CCs that can be configured for each...

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Abstract

Even when a plurality of component carriers are configured in the wireless communication system, HARQ-ACK feedback is appropriately performed. It has: a receiving unit for receiving DL signals transmitted from a plurality of CCs including component carriers (CC: Component Carrier) using TDD; sending HARQ-ACK for DL ​​signals sent from the plurality of CCs in a subframe, the receiving unit receiving first information indicating the codebook size included in the downlink control information of the CCs performing DL transmission, and The second information is used to represent the counter value of the DL allocation CC in the bundling window, and the control unit controls the sending of HARQ-ACK based on the first information and the second information.

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) has been standardized for the purpose of further increasing the high-speed data rate and low delay (Non-Patent Document 1). In addition, LTE-A (also called LTE-Advanced, LTE Rel. 10, 11, or 12 ) was standardized, and the subsequent systems of LTE (for example, also called FRA (Future Radio 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 communication is performed using a plurality of carriers simultaneously using a predetermined bandwidth (maximum 20 MHz) as a basic unit. A carrier serving as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/06H04W28/04H04W72/04
CPCH04L1/1861H04L1/1864H04L1/1887H04W28/04H04W28/06H04W72/04H04L5/0055H04L5/001H04L5/0094H04L5/1469H04W72/12H04L5/14H04L1/1812
Inventor 武田一树永田聪王理惠刘柳蒋惠玲
Owner NTT DOCOMO INC