Mobile communication terminal, interference eliminating system, method and base station

A technology for mobile communication terminals and interference elimination, which is applied in the field of mobile communication terminals, can solve problems such as interference, and achieve the effects of improving reception quality, reducing impact, and eliminating interference

Inactive Publication Date: 2003-06-18
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, in the case where a mobile communication terminal is within reach of radio waves of a plurality of base stations, interference may occur between signals from the communication base stations and signals from other base stations

Method used

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  • Mobile communication terminal, interference eliminating system, method and base station
  • Mobile communication terminal, interference eliminating system, method and base station
  • Mobile communication terminal, interference eliminating system, method and base station

Examples

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Embodiment Construction

[0033] Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0034] First, its configuration will be described. FIG. 1 is a schematic diagram illustrating an example of the overall configuration of an interference cancellation system 100 in the present embodiment. As shown in FIG. 1 , the interference cancellation system 100 generally includes a mobile phone 1 (corresponding to a mobile communication terminal), a mobile phone 11, a mobile phone 21 (corresponding to a mobile communication terminal in an external cell), a base station B1 (corresponding to a local cell base station), base station B2 (corresponding to the base station of the external cell) and wireless controller 31.

[0035] The internal structure will be described in detail later, and the mobile phone 1, 11, 21 is a cellular phone carried and used by a user. The base station B1 is a public base station which has a "local cell A1" as a ...

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Abstract

A mobile phone 1 receives a home cell signal sent from a base station B1 and a foreign cell signal sent from a base station B2 or from a mobile phone 21 in a foreign cell A2. The mobile phone 1 receives spreading codes C2-C4 sent from the base station B1, as home cell codes. The mobile phone 1 detects the interference between the home cell signal and the foreign cell signal. When the interference is detected, the mobile phone 1 receives a spreading code C1 sent from the base station B2 or from the mobile phone 21, as a foreign cell code. The mobile phone 1 cancels an interference signal by joint detection, using the home cell codes and the foreign cell code.

Description

technical field [0001] The invention relates to a mobile communication terminal, an interference elimination system, an interference elimination method and a base station. Background technique [0002] Generally, a TDD (Time Division Duplex) system is taken as one of the systems for substantializing two-way communication between a mobile communication terminal such as a cellular phone and a base station. In the TDD system, the uplink and downlink channels can be switched within a short time (for example, 667 μs), whereby various signals are transmitted and received using the same frequency communication channel. [0003] On the other hand, in a case where a mobile communication terminal is located within the reachable range of radio waves of a plurality of base stations, interference may occur between a signal from a communication base station and a signal from another base station. Interference may occur between a mobile communication terminal and a base station, or betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/707H04B1/7105H04B7/005H04B7/26H04W88/02
CPCH04B1/71052
Inventor 石黑隆之二方敏之伊藤诚文盛郁
Owner NTT DOCOMO INC
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