QCL-TypeD Collision Handling in Multi-TRP Wireless Systems
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Solution Overview
Problem
Current Quasi co-location TypeD (QCL-TypeD) collision handling rules in wireless communication systems do not account for new schemes in multi-Transmission Reception Point (TRP) based Physical Downlink Shared Channel (PDSCH) transmission, leading to inefficiencies in signal reception and reliability issues with Physical Downlink Control Channel (PDCCH).
Innovation Solution
The implementation of new priority rules and scheduling strategies for handling QCL-TypeD collisions, including the use of multiple Transmission Configuration Indicator (TCI) States for PDSCH and PDCCH, to determine signal reception based on transmission schemes such as single frequency network (SFN), frequency division multiplexing (FDM), and spatial division multiplexing (SDM), and applying signal reception priority rules, scheduling restrictions, or QCL-TypeD selection rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current QCL-TypeD collision handling rules are used, then device complexity is reduced, but reliability of PDCCH deteriorates due to inefficiencies in signal reception
Solution Approach 1:
The patent changes the parameter of collision handling rules by introducing new priority rules that consider multiple TRP transmission schemes (SFN, FDM, SDM). These rules adjust how QCL-TypeD collisions are resolved by prioritizing certain PDCCH receptions over others based on the transmission scheme, thereby improving reliability without requiring complex additional hardware
Solution Approach 2:
The patent introduces dynamic QCL-TypeD selection rules that adaptively choose between different QCL-TypeD sources based on the detected transmission scheme. The system dynamically switches between different collision handling approaches depending on whether SFN, FDM, or SDM is being used, allowing flexible adaptation to different transmission scenarios while maintaining manageable complexity
2Adaptability or versatility
If multiple TCI States are used for PDSCH transmission, then adaptability of transmission schemes is improved, but difficulty of detecting and measuring signal quality worsens due to QCL-TypeD collisions
Solution Approach 1:
The patent segments the signal quality measurement process by introducing separate measurement rules for different transmission schemes (SFN, FDM, SDM). Each scheme has specific priority rules that determine which PDCCH's QCL-TypeD properties are used for measuring PDSCH signal quality, eliminating the confusion caused by collisions and making measurement straightforward for each segment
Solution Approach 2:
The patent introduces priority rules as an intermediary mechanism that mediates between multiple TCI States and the actual signal quality measurement. The priority rules act as a selector that determines which TCI State's QCL-TypeD properties should be used for measurement, simplifying the measurement process by filtering out conflicting options
3Productivity
If new priority rules for QCL-TypeD collision handling are implemented, then productivity of signal processing is improved, but device complexity increases due to multiple transmission schemes
Solution Approach 1:
The patent applies preliminary action by establishing priority rules before signal processing occurs. The system pre-defines the hierarchy of PDCCH priorities for different transmission schemes, so that when QCL-TypeD collisions occur, the resolution is immediate and automatic based on pre-established rules, eliminating the need for complex real-time decision-making
Solution Approach 2:
The patent applies local quality by tailoring specific priority rules to each transmission scheme (SFN, FDM, SDM) rather than using a universal rule. Each scheme has its own optimized collision handling approach, allowing efficient signal processing for each specific case while keeping the overall system manageable through scheme-specific rather than globally complex rules
Data Source
AI summary
A UE may receive multiple signals causing a Quasi co-location TypeD (QCL-TypeD) collision. To determine which of the multiple signals to select, the UE may use a certain option based on a type transmission scheme associated with each of the multiple signals. The options may include one of a priority rule for signal reception, a scheduling restriction, or a priority rule for QCL-TypeD selection.