Directional Restricted TDD Scheduling for Cross-Link Interference
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Solution Overview
Problem
Existing 5G NR networks experience significant cross-link interference due to different TDD configurations between neighboring cells, leading to reduced spectrum utilization and degraded service quality, especially in areas where networks with different operators overlap.
Innovation Solution
Implementing a restricted TDD pattern that identifies and excludes specific time units with differing configurations, applying this pattern in directional beams to minimize interference between cells with different TDD configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different TDD configurations are used in neighboring cells to dynamically adapt to traffic patterns, then spectrum utilization is improved, but cross-link interference increases
Solution Approach 1:
The patent applies different TDD configurations in different geographical locations (neighboring cells) to match local traffic patterns, allowing each cell to optimize its spectrum utilization according to local demands while managing interference through coordinated configuration design
Solution Approach 2:
The patent dynamically changes TDD configuration parameters (uplink-downlink slot assignments) based on traffic patterns and interference conditions, enabling flexible adaptation of spectrum resources while coordinating with neighboring cells to minimize cross-link interference
2Object-affected harmful factors
If fixed TDD patterns are specified to enable coexistence between operators, then cross-link interference is reduced, but spectrum utilization improvement is lost
Solution Approach 1:
The patent transitions from fixed TDD patterns to dynamic TDD configurations that can adapt to changing traffic conditions while maintaining coordination mechanisms between operators, enabling both interference management and spectrum utilization optimization
3Object-affected harmful factors
If neighboring cells use the same uplink-downlink configuration to avoid interference, then cross-link interference is reduced, but dynamic adaptation to traffic patterns becomes difficult
Solution Approach 1:
The patent allows each cell to have its own TDD configuration tailored to local traffic patterns while maintaining coordination with neighboring cells, enabling both interference management through coordinated design and dynamic adaptation to local conditions
Solution Approach 2:
The patent implements coordination mechanisms where neighboring cells exchange information about their TDD configurations and interference conditions, allowing dynamic adjustment of configurations based on feedback from the network environment to balance interference reduction and adaptability
Data Source
AI summary
A method, network node and computer storage medium for reducing the impact of interference in a cell from at least another neighbouring cell. The cell operates using a time division duplex, TDD, configuration, and the neighbouring cell operating using another TDD configuration. The TDD configurations are divided into different time units for at least downlink, DL, and uplink, UL, transmissions. The method includes identifying time units in the TDD configuration. The identification of a time unit is based on whether the time unit has a different configuration compared to the time unit in the another TDD configuration used in the neighbouring cell. The method further includes defining a restricted TDD configuration for use in the cell, where the restricted TDD configuration excludes transmission in the identified time units. The method further includes identifying a physical direction in which to apply the restricted TDD configuration.