Multi-TRP Downlink Resource Allocation with TCI State Pairing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing downlink resource allocation for multi-TRP transmission, particularly when non-overlapping frequency resources are associated with different transmission configuration indicator states, and when transmission configuration indicator states indicated by downlink control information are not applicable, which affects communication reliability and efficiency.
Innovation Solution
The method involves defining resource allocation types, determining transmission configuration indicator states, and extending precoding resource block group definitions to enable effective downlink resource allocation for multi-TRP scenarios, even when TCI states are not indicated by DCI, by assuming quasi-co-location relationships and applying appropriate precoding across non-contiguous resource blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission configuration indicator states are indicated by downlink control information, then resource allocation accuracy is improved, but communication reliability deteriorates when TCI states are not applicable
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and establishing default TCI state assumptions before downlink transmission. The network device pre-defines TCI state configurations including quasi-co-location relationships, and the terminal device pre-establishes default assumptions for selecting TCI states when DCI indications are unavailable, ensuring reliable resource allocation even without explicit DCI signaling.
Solution Approach 2:
The patent implements self-service by enabling the terminal device to autonomously determine applicable TCI states using pre-configured default assumptions when DCI-indicated TCI states are not applicable. The terminal self-evaluates the applicability of indicated TCI states based on pre-configured parameters and automatically selects from alternative TCI states without requiring additional network intervention, maintaining communication reliability independently.
2Adaptability or versatility
If non-overlapping frequency resources are associated with different TCI states, then resource allocation flexibility is improved, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing frequency resources into non-overlapping resource blocks, each associated with specific TCI states. The network device configures multiple TCI states with distinct quasi-co-location relationships for different frequency segments, allowing independent optimization of transmission parameters for each resource segment while maintaining manageable complexity through structured configuration.
Solution Approach 2:
The patent implements local quality by assigning different TCI state configurations to different frequency resource segments based on local channel conditions and transmission requirements. Each non-overlapping frequency resource can have customized TCI state associations, enabling localized optimization of quasi-co-location relationships without requiring complex system-wide reconfiguration.
3Reliability
If default TCI state assumptions are configured for multi-TRP transmission, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring default TCI state assumptions through higher-layer signaling before transmission occurs. The network device establishes default TCI state configurations including associations with multiple TRPs, and the terminal device stores these pre-configured assumptions for rapid selection when DCI indications are unavailable, avoiding the need for extensive real-time signaling.
Solution Approach 2:
The patent implements copying by reusing pre-configured TCI state configurations across multiple transmission scenarios and TRPs. The default TCI state assumptions established through higher-layer signaling are copied and applied to multiple resource allocations and transmission points, reducing redundant signaling overhead while maintaining consistent reliable transmission parameters across multi-TRP operations.
Data Source
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AI summary
A method and apparatus provide for receiving (602) a configuration of a plurality of TCI states for a serving cell for PDSCH transmissions, wherein each of the plurality of TCI states contains parameters for configuring a quasi-co-location relationship between downlink reference signals and demodulation reference signal ports of the PDSCH. A PDCCH is received (604), which includes DCI for scheduling a PDSCH. A determination (606) is made as to whether an offset between the reception of the PDCCH and a reception of the PDSCH is less than a predetermined threshold, where in response to the determination that the offset is less than the predetermined threshold, a configured pair of TCI states comprising a first TCI state and a second TCI state is selected from the received configuration of the plurality of TCI states. The PDSCH is decoded (608) based on the selected configured pair of TCI states.