Wireless communication system, wireless base station apparatus, and wireless communication method

A technology of a wireless communication system and a base station, which is applied in the field of wireless communication systems, wireless base station devices and wireless communication, can solve problems such as not considering FFR combination, and achieve the effect of suppressing the increase of uplink communication

Inactive Publication Date: 2011-05-04
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] However, no matter in which literature, the choice of beamforming is implemented in the assigned system-wide frequency band, and the combination with FFR is not considered

Method used

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  • Wireless communication system, wireless base station apparatus, and wireless communication method
  • Wireless communication system, wireless base station apparatus, and wireless communication method
  • Wireless communication system, wireless base station apparatus, and wireless communication method

Examples

Experimental program
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Embodiment Construction

[0068] 1. Beamforming

[0069] Figure 5 Beamforming of an embodiment of the present invention is shown. The horizontal axis represents angles, and the angles are 360 ​​degrees from the left end to the right end. Among them, 12 beams with a semi-fixed pattern are formed. The curve indicated by reference numeral 800 represents the beam pattern. The vertical axis indicates that the antenna gain of the beam increases as it travels upward on the paper. Each beam is formed by, for example, DBF (Digital Beam Forming) technology. In DBF, digital signal processing is used to add appropriate phase and amplitude complex weights to signals transmitted from multiple antenna elements to realize Figure 5 Beamforming shown.

[0070] Figure 26 A configuration example of a polarization diversity array antenna is shown.

[0071] Figure 26An example of an antenna element array for transmitting and receiving two orthogonally polarized waves is shown. Here, unit 201 and unit 204 form ...

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PUM

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Abstract

The present invention provides a wireless communication system, a wireless base station apparatus and a wireless communication method, capable of reducing interfere effect even in a border zone of base stations where quality of signals is bad due to interfere of signals transmitted from a plurality of base station, by means of cooperation of multiple wireless base stations. Random beams and FFR are used in combination, frequencies are grouped into a zone (900) associated with the center of a cell and a zone (901) associated with the border of the cell, and the random beams are applied only tothe zone (901) associated with the border of the cell. Since the number of resources to be allocated to the random beams decreases, a terminal lying on the border of the cell can reduce overhead. Using the zone associated with the center of the cell, beam scheduling can be freely performed within the cell.

Description

technical field [0001] The present invention relates to a wireless communication system, a wireless base station device, and a wireless communication method, and particularly relates to a structure for alleviating the influence of interference in a boundary area between base stations when signal quality deteriorates due to interference of signals transmitted by a plurality of base stations A wireless communication system such as a cellular communication system, a wireless base station device, and a wireless communication method. Background technique [0002] 1. Cellular communication [0003] In mobile wireless communication, a cellular communication system is generally used because a mobile terminal and a base station communicate within a wide service area. In the cellular communication system, a plurality of base stations are distributed in the service area, and the areas covered by each base station (the area where the terminal can communicate) are connected together to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/02H04W16/28
CPCH04W16/10H04W72/046
Inventor 桑原干夫
Owner HITACHI LTD
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