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User terminal, wireless base station, and wireless communication method

A user terminal and wireless communication technology, applied in wireless communication, duplex signal operation, pilot signal distribution, etc., can solve the problem of not being able to send expected signals

Active Publication Date: 2018-12-21
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in CA, CCs supported by DL-CA (DownLink-Carrier Aggregation) and CCs supported by UL-CA (UpLink-Carrier Aggregation) are asymmetrical In this case, a situation occurs in which a desired signal (for example, a reference signal) cannot be transmitted from a user terminal in some CCs

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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Embodiment Construction

[0033] In TDD, beamforming utilizing channel reciprocity (upper and lower symmetry) is effective. In such beamforming, a radio base station estimates a channel state based on known reference signals (pilot signals, SRS, etc.) transmitted by user terminals. For example, when a plurality of CCs are used in the downlink, the user terminal transmits reference signals for each CC. Accordingly, the radio base station can estimate the channel state (channel information) of each CC. The radio base station applies beamforming (or precoding) based on the estimated channel state, and transmits a signal destined for the user terminal on the downlink.

[0034] On the other hand, as described above, in CA, CCs supported in DL-CA and CCs supported in UL-CA may be asymmetrical. Generally, the implementation complexity of user terminals and downlink services tend to increase compared with uplink services. Therefore, compared to the number of CCs supported in UL-CA, the number of CCs supporte...

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Abstract

The present invention achieves sufficient throughput even when a provisional frequency-switching technology is used in TDD. A user terminal that comprises: a transmission / reception unit that performsuplink transmission and / or downlink reception via a first cell; and a control unit that controls the transmission / reception unit such that the transmission / reception unit transmits capability information related to UL reference signal switching that is for switching from the first cell to a second cell that is different from the first cell and transmitting a UL reference signal.

Description

technical field [0001] The present invention relates to a user terminal and a wireless communication method in the next generation mobile communication system. Background technique [0002] In a Universal Mobile Telecommunications System (UMTS: Universal Mobile Telecommunications System) network, Long Term Evolution (LTE: Long Term Evolution) has been standardized for the purpose of higher data rates, lower delays, and the like (Non-Patent Document 1). In addition, LTE-Advanced (also called LTE Advanced, LTE Rel.10, 11, or 12) is standardized for the purpose of widening the bandwidth and speeding up beyond LTE (also called LTE Rel.8 or 9), Successor 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, Rel.14, etc.) In discussion. [0003] In LTE Rel.10 / 11, carrier aggregation (CA: Carrier Aggregation) in which a plurality of component carriers (CC: Compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W8/24H04W72/04
CPCH04W8/24H04W72/04H04W8/22H04L5/0048H04L5/0044H04L5/001H04W72/21H04L5/14
Inventor 武田一树松村祐辉永田聪
Owner NTT DOCOMO INC
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