Inter-cell interference suppression method in mobile communication system

A mobile communication system and interference suppression technology, applied in multi-frequency code systems, diversity/multi-antenna systems, etc., to achieve the effect of improving the overall system capacity and cell edge capacity

Inactive Publication Date: 2013-02-27
CHUNGHWA TELECOM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Today's OFDMA mobile communication system uses partial frequency reuse technology to combat inter-cell interference. Although it can increase cell edge capacity (or cell edge data rate), it sacrifices a lot of system capacity. Therefore, development is more efficient and can be used in the above-mentioned The best balance between the two (system capacity and cell edge capacity) is an inter-cell interference countermeasure method, which has become a very important and challenging issue for mobile communication systems based on OFDMA in the future.

Method used

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  • Inter-cell interference suppression method in mobile communication system
  • Inter-cell interference suppression method in mobile communication system
  • Inter-cell interference suppression method in mobile communication system

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Embodiment Construction

[0025] See image 3 Shown is a flowchart of a method for suppressing inter-cell interference in a mobile communication system of the present invention. Without loss of generality, it is assumed that the mobile communication network is composed of three cells or sectors controlled by a base station. The steps are Include:

[0026] Step 1: The user machine measures the link signal quality and reports it to the servo cell. The signal quality indicator can be a broadband average signal-to-interference-to-noise ratio of 301;

[0027] Step 1: Then in the serving cell, the detector determines whether the broadband average signal to noise ratio is less than the critical value 302;

[0028] Step 2: If the broadband average signal interference to noise ratio is not less than the critical value, then classify the user machine as the cell center user 303;

[0029] Step 3: The system assigns the frequency sub-channel of the center sub-band of the servo cell to the user, that is, the center sub-ban...

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Abstract

The invention discloses an inter-cell interference suppression method in a mobile communication system, which rapidly and dynamically selects partial frequency reusing technology and macro diversity technology on the cell edge so as to fulfill the aim of increasing the data rate of users on the cell edge and can provide superior system capacity simultaneously. The inter-cell interference suppression method is particularly applied to the downlink of a mobile communication system for orthogonal frequency division multiple access (OFDMA), and comprises the following steps of: judging whether the users on the cell edge can operate the macro diversity technology; performing the rapid and dynamic selection of the frequency reusing technology and macro diversity technology for the users on the cell edge, wherein the selection method is based on an instant link signal quality indicator; and configuring central sub-frequency bands or frequency subchannel of the edge sub-frequency bands for the users on the cell edge according to the selected result.

Description

Technical field [0001] The invention relates to a method for suppressing inter-cell interference in a mobile communication system. Background technique [0002] Orthogonal Frequency Division Multiple Access (OFDMA) is regarded as the realization of the fourth generation (4th generation, 4G) mobile communication system access technology. Nowadays, the 4G technology developed by major standards organizations in the world, such as IEEE 802.16m, 3GPP LTE-Advanced and 3GPP2 UMB+, etc., all use OFDMA-based air interface technology. [0003] In the OFDMA system, the two-dimensional time-frequency radio wave resources are composed of the time domain (Orthogonal Frequency Division Multiplex, OFDM) symbol and the frequency domain (frequency domain). Channel (frequency subchannel) is formed, where each frequency subchannel is composed of multiple and different subcarriers. Since within an OFDM symbol time, the frequency sub-channels used by each user in a cell are orthogonal, therefore, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04B7/02
Inventor 邱哲盛唐之璇刘家宏
Owner CHUNGHWA TELECOM CO LTD
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