Radio Access Network CLI Measurement for Dynamic TDD
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3GPP standards lack effective mechanisms for gNB-to-gNB cross-link interference (CLI) measurement, reporting, and coordination, which are crucial for enabling efficient dynamic/flexible TDD operations in communication networks.
Innovation Solution
Implement methods and apparatus for identifying aggressor nodes causing CLI outside a serving area, transmitting reference signals for CLI measurement, configuring resources for CLI detection, and aligning arrival times of uplink signals and reference signals to mitigate CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDD networks utilize the same bandwidth for uplink and downlink to improve spectrum efficiency, then spectrum utilization is improved, but cross-link interference between simultaneous transmissions increases
Solution Approach 1:
The patent applies preliminary action by configuring specific time resources and reference signals in advance to enable CLI measurement and identification before interference occurs. The network node pre-configures CLI reference signals and measurement resources so that when dynamic TDD operations cause interference, the system can quickly detect and mitigate it without waiting for the interference to manifest.
Solution Approach 2:
The patent implements feedback mechanisms where user equipment measures CLI on configured reference signals and reports measurements back to the network node. This feedback loop enables the network to identify aggressor nodes causing interference and adjust resource allocations dynamically to mitigate the harmful effects while maintaining high spectrum utilization.
2Adaptability or versatility
If dynamic TDD operations are implemented to improve network flexibility and efficiency, then network adaptability is improved, but coordination mechanisms for CLI management become more complex
Solution Approach 1:
The patent applies segmentation by dividing the CLI management process into distinct functional components: reference signal transmission by aggressor nodes, measurement by victim nodes, reporting by user equipment, and coordination by network nodes. This segmentation allows each component to be optimized independently while maintaining overall system flexibility and reducing coordination complexity.
Solution Approach 2:
The patent implements universal mechanisms where configured reference signals serve multiple purposes: they function as both downlink reference signals for normal operations and as CLI measurement signals for interference detection. This multi-functionality reduces the need for separate dedicated measurement resources, thereby reducing system complexity while maintaining adaptability.
3Measurement precision
If reference signals are transmitted for CLI measurement to improve interference detection accuracy, then measurement precision is improved, but signal resources and system overhead increase
Solution Approach 1:
The patent applies universality by configuring existing downlink reference signals to serve dual purposes: normal downlink communication and CLI measurement. The network node configures CLI reference signals that are transmitted during downlink operations, allowing the same signal resources to fulfill both communication and measurement functions, thereby improving detection accuracy without proportionally increasing resource consumption.
Solution Approach 2:
The patent implements partial action by configuring CLI measurement resources selectively based on network conditions and interference scenarios. Rather than deploying comprehensive measurement resources across all time-frequency resources, the system configures measurement references only where and when CLI is likely to occur, optimizing the balance between measurement precision and resource efficiency.
Data Source
AI summary
A system is disclosed in which a victim base station configures at least one resource for measurement of cross link interference (CLI) caused by radio transmissions from a remote aggressor base station. The victim base station determines a level of the CLI based on a received signal strength value of a CLI reference signal from the remote aggressor base station. The received signal strength value may be a CLI channel state information-reference signal received power value or a base station specific CLI received signal strength indicator value.