Inter-Cell Interference Control via Priority Scheduling

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Solution Overview

Problem

Wireless communication systems supporting multiple component carriers face challenges in controlling inter-cell interference, which affects communication performance and throughput.

Innovation Solution

A method and apparatus for controlling inter-cell interference by receiving priority information from neighboring base stations, measuring signal strength, and generating priority information for interference protection, which is used to schedule user equipment and allocate resources effectively, prioritizing component carriers to minimize interference at cell edges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple component carriers are used to increase system capacity, then productivity is improved, but inter-cell interference increases which deteriorates reliability

Engineering Contradiction:

Improvesystem capacityVSAvoidcommunication performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by assigning different interference protection priorities to different component carriers based on their specific characteristics and interference conditions. Each component carrier is evaluated individually, and priority levels are assigned locally rather than uniformly across all carriers, allowing optimal interference management for each carrier while maintaining overall system capacity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of interference protection priority dynamically based on measured signal strength from neighboring base stations. By adjusting the priority parameter according to actual interference conditions, the system can adaptively manage multiple component carriers to maximize capacity while maintaining communication reliability under varying interference scenarios

Inventive Principle:

Principle #35Parameter changes

2Reliability

If interference protection priority is assigned to all component carriers, then reliability is improved, but device complexity increases due to coordination overhead

Engineering Contradiction:

Improveinterference protectionVSAvoidbase station coordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies partial action by assigning interference protection priority only to specific component carriers that require it, rather than all carriers. Based on measured signal strength and interference conditions, the system selectively applies protection measures to the necessary subset of carriers, reducing coordination overhead while maintaining adequate interference protection where needed

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent segments the interference management process by dividing component carriers into different priority groups based on their interference exposure. This segmentation allows the base station to manage interference protection in a structured manner, handling high-priority carriers with full coordination while using simplified approaches for lower-priority carriers, thereby reducing overall device complexity

Inventive Principle:

Principle #1Segmentation

3Reliability

If priority information is exchanged between all neighboring base stations, then reliability is improved through coordinated interference protection, but loss of time increases due to signaling overhead

Engineering Contradiction:

Improvecoordinated interference protectionVSAvoidpriority information exchange time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies local quality by exchanging priority information only with neighboring base stations that are relevant to specific component carriers experiencing interference. Rather than universal information exchange with all neighbors, the system selectively shares priority data with those neighbors whose transmissions actually impact the local interference conditions, reducing signaling time while maintaining coordinated protection

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements preliminary action by pre-determining priority information for component carriers based on configured parameters before actual interference occurs. This advance preparation allows base stations to have priority information ready for exchange, reducing the time required for coordination during active interference conditions while still achieving reliable coordinated protection

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9100972B2Method for controlling inter-cell interference in a wireless communication system that supports a plurality of component carriers, and base station apparatus for same

Publication Date: 2015.08.04 ROSEDALE DYNAMICS LLC

AI summary

A method for controlling inter-cell interference in a wireless communication system that supports a plurality of component carriers (CCs) according to the present invention comprises the following steps: receiving priority information on the interference protection for each of a plurality of component carriers from at least one neighboring base station; measuring an intensity of the signal received from the at least one neighboring base station; and generating priority information for interference protection for each of a plurality of component carriers constructed for the base station, based on the received priority information and the measured intensity of the signal received from the at least one neighboring base station.