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Wireless communication system, wireless base station device, user terminal, and wireless communication method

A technology of wireless communication system and wireless base station, which is applied in the field of wireless communication system to achieve the effect of reducing characteristic degradation and improving throughput

Inactive Publication Date: 2014-04-23
NTT DOCOMO INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to W-CDMA between cells, randomization of interference due to frequency repetition in one cell is basically

Method used

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  • Wireless communication system, wireless base station device, user terminal, and wireless communication method
  • Wireless communication system, wireless base station device, user terminal, and wireless communication method
  • Wireless communication system, wireless base station device, user terminal, and wireless communication method

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Embodiment Construction

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0032] figure 1 It is a diagram for explaining an example of a heterogeneous network. figure 1 The wireless communication system shown constitutes a heterogeneous network, and adopts a configuration in which a cell C11 having a predetermined cell radius overlaps cells C21 and C22 having a smaller cell radius than the cell radius of the cell C11.

[0033] The radio communication system 1 includes a radio base station device (macro base station) 20 forming a cell with a relatively large cell radius (macro cell), and a radio base station device (pico base station) 200A forming a cell with a relatively small cell radius (pico cell, femto cell) , 200B. The pico base stations 200A and 200B may be installed in buildings or the like to form so-called hot spots. Furthermore, the user terminal (UE) 10 communicates wirelessly with the macro base station 20 and / or the ...

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Abstract

The purpose of the invention is to reduce the effect of degradation in characteristics due to interference, when CoMP transmission is implemented in a heterogeneous network. In a user terminal, a first reception signal quality during a first transmission interval in which a macro base station is not transmitting or is transmitting at reduced power, and a second reception signal quality during a second transmission interval in which the macro base station and a low power node are transmitting, are measured, and an uplink signal that includes the first reception signal quality and the second reception signal quality is transmitted to the macro base station. In the macro base station, the uplink signal that includes the first reception signal quality and the second reception signal quality is received, and during coordinated multipoint transmission, wireless resources of user terminals present at the limit of the cooperation area are assigned to the first transmission interval on the basis of the first reception signal quality and the second reception signal quality.

Description

technical field [0001] The present invention relates to a wireless communication system, a wireless base station device, a user terminal and a wireless communication method in the next generation mobile communication system. Background technique [0002] In the UMTS (Universal Mobile Telecommunications System) network, HSDPA (High-Speed ​​Downlink Packet Access) and HSUPA (High-Speed ​​Uplink Packet Access) are used to maximize frequency utilization efficiency and data rate. Features of systems based on W-CDMA (Wideband Code Division Multiple Access). Regarding this UMTS network, LTE (Long Term Evolution) is being studied for the purpose of further increasing the data rate at a higher rate, lowering the delay, and the like (Non-Patent Document 1). [0003] The third-generation system uses a fixed frequency band of approximately 5 MHz, and can achieve a maximum transmission rate of approximately 2 Mbps in the downlink. On the other hand, in the LTE system, using a variable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/16H04W16/32H04W24/10H04W72/08H04J11/00H04W72/54
CPCH04W16/32H04W24/00H04L5/00H04W72/082H04B7/024H04W72/085H04L1/00H04B7/0456Y02B60/50H04B7/0639H04W72/0413H04B7/0632H04W52/244H04W52/40H04W84/045H04L5/0057H04L5/0092H04L5/0035H04L5/0073H04L1/20H04W72/541H04W72/542H04W72/21
Inventor 永田聪阿部哲士三木信彦X.佘
Owner NTT DOCOMO INC
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