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Radio base station, user terminal and radio communication method

A wireless base station and user terminal technology, applied in wireless communication, pilot signal distribution, multiple use of transmission paths, etc., can solve problems such as limited spectrum

Inactive Publication Date: 2018-03-27
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to absorb the increased user traffic, more frequency bands are required, but the spectrum in the licensed band (licensed spectrum) is limited

Method used

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  • Radio base station, user terminal and radio communication method
  • Radio base station, user terminal and radio communication method
  • Radio base station, user terminal and radio communication method

Examples

Experimental program
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Embodiment Construction

[0035] In a system (for example, LAA system) operating LTE / LTE-A in an unlicensed band, it is considered that an interference control function is required in order to coexist with other operators' LTE, Wi-Fi, or other systems. In addition, systems that operate LTE / LTE-A in the unlicensed band can be collectively referred to as LAA, LAA-LTE, LTE-U, U-LTE, etc. regardless of whether the operating mode is CA, DC, or SA.

[0036] Generally, a transmission point (for example, a radio base station (eNB), a user terminal (UE), etc.) that uses a carrier in an unlicensed band (also referred to as a carrier frequency or simply a frequency) for communication, detects that it is using the carrier frequency In the case of other entities (for example, other UEs) communicating with a carrier in the unlicensed band, transmission using the carrier is prohibited.

[0037] Therefore, the transmission point executes listening (LBT) at a timing before the transmission timing by a predetermined per...

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Abstract

The objective of the present invention is to make it possible for communication to be performed appropriately in a cell (such as an unlicensed band) in which listening is applied before transmission.This radio base station includes: a transmitting unit which, on the basis of listening results, transmits a detection / measurement signal including a first reference signal for channel state measurement; and a control unit which controls resource allocation for the detection / measurement signal. The control unit allocates the first reference signal in such a way that the first reference signal is extended in the time direction compared with an existing second reference signal for channel state measurement.

Description

technical field [0001] The present invention relates to a wireless base station, a user terminal and a wireless communication method in the next generation mobile communication system. Background technique [0002] In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE: Long Term Evolution) has been regulated for the purpose of further increasing high-speed data rate, low delay, and the like (Non-Patent Document 1). In addition, LTE-Advanced (Rel. 10-12) has been standardized for the purpose of further wideband and high-speed from LTE, and, for example, research is underway on what is called 5G (5th generation mobile communication system )) The successor system of LTE. [0003] In LTE of Rel.8-12, it is assumed that an exclusive operation is performed in a frequency band (also called a licensed band) licensed to a communication operator (Operator), and specifications are made. As licensed bands, for example, 800 MHz, 1.7 GHz, 2 GHz, etc. a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W16/14
CPCH04W16/14H04L5/0023H04L5/005H04W72/04H04L5/0048H04W48/08
Inventor 原田浩树武田一树永田聪
Owner NTT DOCOMO INC