Interference Handling in Dynamic TDD Radio Access Network Nodes
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Solution Overview
Problem
Current wireless cellular networks face challenges in efficiently handling interference, particularly in dynamic Time Division Duplex (TDD) scenarios, where interference increases with higher traffic loads, leading to suboptimal resource utilization and coordination difficulties between network operators.
Innovation Solution
A method and network node configuration that involves querying neighboring nodes for uplink wireless transmission scheduling information to identify and mitigate interference by adjusting reference signal resources and precoders, enabling better interference management and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD is used to maximize radio resource utilization, then productivity is improved, but interference increases at higher traffic loads
Solution Approach 1:
The system performs preliminary actions by querying neighboring network nodes about scheduled uplink transmissions before actual interference occurs. The network node obtains interference indications and queries scheduling information in advance, allowing for proactive interference management rather than reactive mitigation.
Solution Approach 2:
The system implements feedback mechanisms where network nodes exchange interference indications and scheduling information with neighboring nodes. This feedback loop allows each node to adjust its transmission parameters based on real-time interference conditions, dynamically optimizing resource allocation while mitigating interference effects.
2Ease of operation
If a fixed TDD pattern is used for all RAN nodes, then coordination is simplified, but resource utilization becomes inefficient
Solution Approach 1:
The system transitions from static fixed TDD patterns to dynamic TDD configurations where each network node can independently adjust its uplink/downlink pattern based on local traffic conditions and interference measurements. This dynamic adaptation allows optimal resource utilization while maintaining manageable coordination through standardized query-response protocols.
3Object-affected harmful factors
If TDD UL/DL periods are aligned to reduce interference, then harmful factors are reduced, but adaptability to varying traffic conditions decreases
Solution Approach 1:
The system applies local quality by allowing each network node to independently configure its TDD pattern based on local traffic conditions and interference characteristics. Instead of a uniform fixed pattern, each node adapts its UL/DL allocation to match local demands, improving both interference management and traffic adaptation capability.
Data Source
AI summary
There is provided mechanisms for interference handling. A method is performed by a radio access network node. The method comprises obtaining an indication of interference in a time/frequency interval. The method comprises querying a neighbouring radio access network node about scheduling in the time/frequency interval of uplink wireless transmission from any terminal device served by the neighbouring radio access network node. The method comprises receiving a response from the neighbouring radio access network node. The response comprises information identifying uplink reference signal resources/ports, and their scheduling, as to be used by the terminal device scheduled in the time/frequency interval.