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Base station, user equipment, method for applying precoding matrix, and method for acquiring precoding matrix

A technology of precoding matrix and user equipment, applied in the direction of multiple use of transmission path, advanced technology, digital transmission system, etc., can solve the problem of weak signal of UE2

Inactive Publication Date: 2018-08-28
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, for UE1 at the end of the cell, since the signal of UE2 that interferes with UE1 is assigned low power, as in Figure 2C As shown, UE2's signal is very weak

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  • Base station, user equipment, method for applying precoding matrix, and method for acquiring precoding matrix
  • Base station, user equipment, method for applying precoding matrix, and method for acquiring precoding matrix
  • Base station, user equipment, method for applying precoding matrix, and method for acquiring precoding matrix

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Embodiment Construction

[0037] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the embodiment described below is just an example, and the embodiment to which this invention is applied is not limited to the following embodiment. For example, a system conforming to the LTE scheme is conceived as the radio communication system of this embodiment, but the present invention is not limited to LTE and can be applied to other schemes. In addition, in this specification and the claims, "LTE" includes communication methods (including 5G) corresponding to 3GPP release 12, 13, 14 or later, and is used in a broad sense. In addition, the "precoding matrix" described below is used in the sense of including the "precoding vector".

[0038] (system structure)

[0039] image 3 A configuration diagram of a radio communication system in the embodiment of the present invention is shown. Such as image 3 As shown, the wireless communication system of t...

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Abstract

A base station is disclosed and used in a wireless communication system. The base station is provided with: a precoding matrix calculation unit for calculating a precoding matrix on the basis of a first precoding matrix notified from first user equipment in a pair selected as the object of multiplexing in a power domain, and a second precoding matrix notified from second user equipment in the pair, in a base station that is used in a wireless communication system; and a precode unit in which the precoding matrix calculated by the precoding matrix calculation unit is used and a precode is applied to a transmitted signal transmitted to the first user equipment and the second user equipment.

Description

technical field [0001] The present invention relates to a wireless communication system using Non-Orthogonal Multiple Access (NOMA: Non-Orthogonal Multiple Access). Background technique [0002] In 5G, which is the next-generation mobile communication system, non-orthogonal multiple access (NOMA: Non-Orthogonal Multiple Access) technology is being studied. NOMA is a multiple access access method that multiplexes and simultaneously transmits signals addressed to multiple user equipment UEs (hereinafter referred to as UEs) in a cell on the same resource on the base station eNB (hereinafter referred to as eNB) side. Enter the law. Therefore, further improvement in frequency utilization efficiency is expected. [0003] refer to figure 1 , Figure 2A ~C, explain the basic principle of NOMA in the downlink (for example, Non-Patent Document 1). figure 1 UE2 near the eNB and UE1 near the cell edge are shown. [0004] eNB selects UE1 and UE2 as a pair (pair), such as Figure 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456
CPCH04B7/0452H04B7/0478H04L5/0014Y02D30/70H04L27/00H04J99/00H04B7/0456
Inventor 佐野洋介武田和晃永田聪严春林李安新蒋惠玲
Owner NTT DOCOMO INC