Quasi-Colocation Indication for Multi-TRP Downlink Coordination
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Solution Overview
Problem
Wireless communication networks face interference and congestion due to increased demand for mobile broadband access, leading to degraded performance on both downlink and uplink transmissions, especially in scenarios where multiple base stations and user equipment (UEs) share communication resources.
Innovation Solution
A method and apparatus for wireless communication that involves receiving and processing downlink control information (DCI) with transmission configuration indicator (TCI) states, adjusting these states based on quasi-colocation (QCL) assumptions, and transmitting data using listen before talk (LBT) procedures to manage shared communication spectrum, ensuring successful multi-transmission-reception point (TRP) downlink transmissions and adjusting TCI states accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple base stations and UEs share communication resources to meet increasing demand for mobile broadband access, then network capacity and coverage are improved, but interference and congestion increase leading to degraded transmission performance
Solution Approach 1:
The patent applies preliminary action by having the first base station transmit downlink control information (DCI) indicating TCI states before the actual data transmission occurs. This allows the UE to prepare the necessary reception parameters in advance, enabling efficient shared spectrum access without requiring complex real-time coordination during the transmission itself.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors for second DCI messages that provide adjustments to TCI states after the initial transmission. This feedback loop allows the system to adapt to changing network conditions and interference levels, optimizing performance in shared spectrum environments where congestion and interference are prevalent.
2Reliability
If TCI states are adjusted dynamically to reflect actual transmission conditions, then transmission reliability is improved, but signaling complexity and processing overhead increase
Solution Approach 1:
The patent segments the TCI state adjustment information into separate DCI messages - an initial DCI providing baseline TCI states and a subsequent second DCI providing adjustments. This segmentation allows the UE to process TCI state information in manageable increments rather than handling all adjustment information simultaneously, reducing processing complexity while maintaining reliable transmission adaptation.
Solution Approach 2:
The patent changes the parameter representation by using adjustment indicators rather than transmitting complete TCI state configurations. Instead of retransmitting full TCI state information, the system transmits delta adjustments to existing states, significantly reducing signaling overhead and complexity while maintaining the ability to accurately reflect actual transmission conditions.
Data Source
AI summary
Quasi-colocation (QCL) indication is discussed after downlink transmission. In the management of multiple transmission-reception point (TRP) downlink transmissions, a second indication of a QCL assumption for a particular downlink transmission may be transmitted to receiving user equipment (UEs) after transmission of the downlink transmission. Once a TRP passes a listen before talk (LBT) procedure in a first time interval, it may send a first downlink control information (DCI) with indication of a first QCL assumption for the transmission in the first time interval. The TRP then transmits the downlink transmission intended for part of the multi-TRP downlink transmission. Upon receiving an indication that another of the TRPs was unsuccessful in its part of the multi-TRP transmission, the TRP may transmit a second DCI in a subsequent time interval with adjustments to the QCL assumption for the UEs to use in processing the downlink transmission from the first time interval.