QCL Information Indication for Full Duplex Cross-Link Interference Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face challenges in managing cross-link interference (CLI) during full duplex (FD) communications, where uplink and downlink transmissions occur simultaneously, leading to signal failures, latency, resource waste, and increased power consumption due to unknown CLI metrics for different receive beams.
Innovation Solution
The method involves determining and reporting quasi co-location (QCL) information to select beam pairs with reduced CLI, allowing user equipment (UE) to choose receive beams based on transmission configuration indicator (TCI) states and reporting measured CLI to the network entity, thereby mitigating interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented to increase spectral efficiency, then productivity is improved, but cross-link interference increases causing signal failures and latency
Solution Approach 1:
The patent implements feedback mechanisms where UEs report CLI measurements and TCI state information to the network entity. The network entity uses this feedback to dynamically adjust beam configurations and scheduling decisions, enabling the system to adapt to changing interference conditions while maintaining full duplex operation. This feedback loop allows the system to exploit full duplex capabilities when interference is low and mitigate or suspend FD operation when interference becomes problematic.
Solution Approach 2:
The patent introduces dynamic beam management where the network entity can switch between different beam configurations based on real-time CLI measurements. The system dynamically adjusts which UEs operate in full duplex mode and which beams are used for transmission and reception, allowing flexible adaptation to interference conditions. This dynamic reconfiguration enables the system to maintain high spectral efficiency while avoiding signal failures through intelligent resource allocation.
2Measurement precision
If CLI measurement resources are configured for all receive beams, then measurement precision is improved, but device complexity and processing overhead increase
Solution Approach 1:
Instead of configuring CLI measurement resources for all possible receive beams, the patent applies partial action by measuring CLI only for a subset of beams that are actually used or predicted to be used. The network entity configures measurement resources based on active beam pairs and TCI states, rather than all potential beams. This reduces the measurement burden on UEs while still providing sufficient precision for beam selection and interference management.
Solution Approach 2:
The patent implements preliminary action by pre-configuring TCI states and beam information before CLI measurement is needed. The network entity provides advance configuration of measurement resources associated with specific TCI states, allowing UEs to perform measurements more efficiently without needing to evaluate all possible beams. This preliminary setup reduces real-time processing complexity while maintaining measurement accuracy for the intended beam pairs.
3Reliability
If beam selection is based on TCI states to reduce CLI, then reliability is improved, but the need for additional QCL information indication increases signaling overhead
Solution Approach 1:
The patent applies universality by making TCI states serve multiple functions: they not only indicate transmission beam information but also implicitly provide reception beam information through quasi co-location relationships. The same TCI state configuration used for downlink beam indication also enables the UE to determine appropriate receive beams for CLI measurement and communication. This multi-functionality reduces the need for separate signaling mechanisms to convey beam information.
Solution Approach 2:
The patent merges the indication of transmission beam information and reception beam information into a single TCI state configuration. By combining these two types of beam information into one unified structure, the system reduces signaling overhead while still providing complete beam selection capabilities. The quasi co-location relationship between reference signals and communication signals allows this merging without loss of information.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication by a first user equipment (UE), comprising receiving, from a network entity, a configuration of one or more measurement resources for measuring cross link interference (CLI) between the first UE and a second UE, determining reception quasi co-location (QCL) information of a transmission configuration indicator (TCI) state for the measurement resources, measuring CLI on the measurement resources using the reception QCL information, and reporting the CLI to the network entity.