Intra-UE UL-DL Collision Handling in SBFD Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Intra-UE UL-DL collision handling in single CC UE configurations within gNB-only Subband Full-duplex (SBFD) networks is challenging due to the need for efficient resource allocation and collision resolution between uplink and downlink transmissions, particularly in scenarios where legacy TDD configurations and dynamic scheduling decisions intersect.
Innovation Solution
A method where a UE receives carrier TDD and subband TDD configurations from a base station, determining collisions and selecting link directions based on UE-specific configurations or priority rules to manage time slots and symbols, ensuring optimal resource utilization and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subband TDD configurations are introduced to enable flexible UL-DL allocation in SBFD networks, then network efficiency and spectral utilization are improved, but collision resolution complexity and UE processing burden increase
Solution Approach 1:
The frequency spectrum is segmented into multiple subbands, each with independent TDD configurations. This allows flexible UL-DL allocation at the subband level rather than requiring uniform configuration across the entire carrier, enabling optimized resource utilization while containing collision resolution complexity to individual subbands.
Solution Approach 2:
Different subbands are configured with different TDD patterns and UL-DL allocations according to local traffic characteristics and interference conditions. Each subband can have customized collision resolution behavior based on its specific requirements, allowing optimized performance without requiring system-wide complex processing.
2Adaptability or versatility
If dynamic scheduling decisions are made at the subband level, then resource allocation flexibility is improved, but UE processing time and collision detection overhead increase
Solution Approach 1:
TDD configurations for each subband are semi-statically configured via RRC signaling before dynamic scheduling operations. This preliminary configuration establishes the UL-DL pattern and collision resolution rules in advance, allowing the UE to quickly determine collision scenarios during dynamic scheduling without performing complex real-time analysis.
Solution Approach 2:
The MAC layer collision resolution mechanism acts as an intermediary between the flexible dynamic scheduling decisions and the physical layer transmission. It processes collision detection and resolution efficiently at the MAC level using pre-configured subband TDD patterns, reducing the processing burden on the UE during dynamic scheduling operations.
3Adaptability or versatility
If legacy TDD configurations are maintained for backward compatibility, then system compatibility is improved, but the ability to handle SBFD-specific collision scenarios is reduced
Solution Approach 1:
The UE is designed to support both legacy TDD configurations and new subband TDD configurations simultaneously. The collision resolution mechanism is enhanced to handle multiple configuration types (legacy carrier-level TDD, new subband-level TDD, and their combinations), allowing the system to maintain backward compatibility while achieving reliable SBFD-specific collision handling through unified processing logic.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. In certain configurations, the UE receives, from a base station, a carrier time division duplexing (TDD) configuration of time slots and symbols for a component carrier (CC). The UE receives, from the base station, one or more subband TDD configurations specific to a subband for the CC. The UE determines, according to the carrier TDD configuration and the subband TDD configurations, whether a collision exists between an uplink (UL) transmission and a downlink (DL) reception for each of the time slots and the symbols. The UE selects one of the UL transmission and the DL reception for one of more of the time slots and the symbols with the collision based on a UE-specific link direction configuration or a plurality of priority rules.