PRACH Slot Selection for Cross-Link Interference Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in handling cross-link interference (CLI) during flexible or full duplexing operations, particularly in random access channel occasions, which can lead to uplink-to-downlink interference and reduced network performance.
Innovation Solution
Implementing a dual RACH configuration system for user equipment, where one configuration is for uplink slots and another for flexible duplexing slots, with parameters to steer the UE to prioritize transmissions on FDU slots based on QoS, path loss, and maximum output power to mitigate CLI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flexible or full duplexing operations are implemented to enhance network capacity and reduce latency, then network performance and resource utilization are improved, but cross-link interference between uplink and downlink transmissions increases
Solution Approach 1:
The patent segments the random access channel configurations into multiple sets, where each set corresponds to different duplexing modes (TDD and FDU). This segmentation allows the network to selectively apply appropriate configurations for different operational scenarios, thereby enabling flexible duplexing operations to enhance network capacity while managing cross-link interference through mode-specific parameter adjustments.
Solution Approach 2:
The patent employs parameter changes by providing multiple RACH configurations with different parameters (such as time offsets, frequency resources, and power levels) tailored for TDD and FDU modes. The network can dynamically adjust these parameters based on the current duplexing mode, allowing optimization of network capacity in FDU mode while controlling cross-link interference through parameter adaptation.
2Adaptability or versatility
If multiple random access channel configurations are provided for different duplexing modes, then adaptability to various network conditions is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by providing specific RACH configuration parameters tailored to local network conditions and duplexing modes. Each configuration set is optimized for its intended mode (TDD or FDU), allowing the network to maintain high adaptability through mode-specific optimizations while reducing overall complexity by avoiding a single overly complex universal configuration.
Solution Approach 2:
The patent implements dynamics by enabling the network to dynamically select and switch between different RACH configuration sets based on current operational mode and network conditions. This dynamic approach allows the system to adapt to varying conditions without requiring all possible configurations to be simultaneously active, thereby managing complexity through selective activation.
3Object-affected harmful factors
If UE transmission power is optimized to reduce cross-link interference, then interference levels are reduced, but initial access delay may increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple RACH sets with different power parameters before actual access attempts. The UE can be pre-instructed with configuration indices and associated power levels, allowing it to quickly select appropriate power settings based on the current mode without requiring real-time power optimization calculations, thus reducing access delay while maintaining interference control.
Solution Approach 2:
The patent employs feedback mechanisms where the network monitors access success rates and interference levels, then adjusts the configured power parameters for different RACH sets accordingly. This feedback loop allows the system to optimize the trade-off between interference reduction and access delay by learning from actual network conditions and adjusting configurations in subsequent access attempts.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for improved handling of cross-link interference on physical random access channel occasions on flexible or full duplexing slots are provided. For example, a method can include providing a plurality of random access channel configurations to a user equipment. A first random access channel configuration of the plurality of random access channel configurations can be for a first set of symbols or slots and a second random access channel configuration of the plurality of random access channel configurations can be for a second set of symbols or slots. The method can also include providing, to the user equipment, one or more parameters configured to steer the user equipment to select between the first set of symbols or slots or the second set of symbols or slots to be used when performing a random access transmission. The method can further include receiving a random access transmission on the selected set of symbols or slots based on one of the plurality of random access channel configurations.