Coordinated Transmission in Use-Restricted Subframes

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Solution Overview

Problem

Current mobile communication systems face inefficiencies in utilizing use-restricted subframes (ABS) to suppress inter-cell interference, leading to suboptimal radio resource utilization.

Innovation Solution

Implementing a coordinated transmission method where the first cell performs coordinated transmission with the second cell in the use-restricted subframe, using PDSCH resources while avoiding PDCCH and CRS resources, and scheduling data transmission to improve interference suppression and resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a use-restricted subframe (ABS) is set in the first cell to suppress interference to the second cell, then interference suppression is improved, but radio resource utilization deteriorates

Engineering Contradiction:

Improveinterference suppressionVSAvoidradio resource utilization

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent converts the harmful idle radio resources in ABS subframes into beneficial transmission opportunities. By performing coordinated transmission where the first cell (aggressor) transmits data to the user terminal in the ABS subframe of the second cell (victim), the previously wasted resources are transformed into useful capacity, improving overall radio resource utilization while maintaining interference suppression benefits

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent merges the transmission functions of two cells for a common user terminal. The first cell and second cell coordinate to transmit data to the same user terminal in the ABS subframe, combining their resources to improve spectral efficiency. This merging allows the aggressor cell to utilize its otherwise idle ABS resources while the victim cell maintains its interference suppression strategy

Inventive Principle:

Principle #5Merging (Combining)

2Productivity

If coordinated transmission is performed in the use-restricted subframe, then resource efficiency is improved, but transmission reliability may deteriorate due to potential interference

Engineering Contradiction:

Improveresource efficiencyVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by differentiating the treatment of different resource types within the ABS subframe. PDSCH resources are utilized for coordinated transmission to improve efficiency, while PDCCH and CRS resources are protected from transmission to maintain reliability. This selective approach allows the system to exploit available resources without compromising critical control functions

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the ABS subframe resources into different functional categories: PDSCH resources are allocated for coordinated data transmission, while PDCCH and CRS resources are reserved for control and reference functions. This segmentation allows the system to simultaneously achieve improved resource efficiency in data transmission while maintaining transmission reliability through protected control channels

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10070446B2Communication control method, base station, and user terminal

Publication Date: 2018.09.04 KYOCERA CORP

AI summary

A communication control method used in a mobile communication system in which in order to suppress an interference from a first cell to a second cell, a use-restricted subframe is set in the first cell comprises a coordinated transmission step of performing, in the use-restricted subframe, a coordinated transmission from the first cell and the second cell to a user terminal connected to the second cell.