Uplink Spatial Filter Selection Through Dynamic TCI State Activation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam management and pathloss reference signal (PL-RS) updates in heterogeneous networks, leading to suboptimal performance and resource inefficiencies.
Innovation Solution
A mechanism for updating TCI states and PL-RSs using MAC CEs to enhance beam management and resource allocation, particularly in multi-TRP and multi-panel scenarios, optimizing communication protocols for improved coverage and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam management and PL-RS updates are performed frequently in heterogeneous networks, then communication coverage and capacity are improved, but system complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and PL-RS configurations before actual communication begins. The gNB prepares and signals available TCI states via RRC configuration, allowing the UE to have beam information ready in advance. This reduces the need for frequent real-time beam management updates while maintaining communication coverage through pre-established beam configurations.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports beam measurement results and channel state information back to the gNB. This feedback loop enables the gNB to adapt beam configurations dynamically based on actual channel conditions, improving communication reliability without requiring constant beam management changes. The feedback-driven adaptation optimizes the balance between coverage and system complexity.
2Adaptability or versatility
If multiple TCI states and PL-RS configurations are maintained, then beam management flexibility is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making TCI state activation dynamic rather than static. The gNB can dynamically activate specific TCI states based on current communication needs and channel conditions. This dynamic activation allows the system to maintain flexibility for multiple beam configurations while improving resource allocation efficiency by only actively managing and signaling necessary TCI states rather than all possible configurations simultaneously.
Solution Approach 2:
The patent segments the beam management process into distinct components: TCI state configuration, PL-RS configuration, and active TCI state selection. This segmentation allows independent optimization of each component, enabling the system to maintain flexibility in beam management while improving overall resource allocation efficiency through coordinated operation of segmented functions.
3Measurement precision
If PL-RS updates are performed dynamically, then pathloss estimation accuracy is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple PL-RS configurations associated with different TCI states before actual pathloss estimation is needed. The gNB prepares PL-RS configurations in advance and signals their association with TCI states, allowing the UE to perform accurate pathloss estimation without waiting for dynamic updates. This reduces estimation latency while maintaining accuracy through pre-prepared reference signals.
Solution Approach 2:
The patent uses copying by creating multiple copies of PL-RS configurations that can be selectively activated. Instead of dynamically creating new PL-RS configurations, the system copies and reuses pre-configured PL-RS configurations associated with different TCI states. This copying approach maintains pathloss estimation accuracy by having multiple reference signal copies available while reducing update latency by avoiding creation of new configurations.
Data Source
AI summary
A wireless device receives one or more configuration parameters indicating a plurality of transmission configuration indicator (TCI) states for uplink transmissions. The wireless device transmits, for a random access procedure, a physical uplink shared channel (PUSCH) transmission with a spatial filter. The wireless device receives a medium access control control element (MAC CE) indicating activation of more than one TCI state of the plurality of TCI states. The wireless device transmits, with the spatial filter used during the random access procedure, one or more uplink signals before receiving a downlink control information (DCI) indicating a TCI state from the more than one TCI state.