Dynamic TCI State Indication for 5G NR CORESET Scheduling
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently determining quasi co-location (QCL) assumptions for dynamic control resource sets (CORESETS), which affects the processing of physical downlink control channel (PDCCH) transmissions and can lead to increased latency and reduced scheduling flexibility.
Innovation Solution
The method involves a user equipment (UE) receiving downlink control information (DCI) that schedules dynamic CORESETS and indicates a transmission configuration indicator (TCI) state, determining whether to apply this state for processing PDCCH transmissions based on specific conditions, and receiving PDCCH in accordance with this determination, allowing for dynamic configuration of control channel resources to enhance power saving and scheduling flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic CORESETS are configured with explicit TCI state indications, then scheduling flexibility and power saving are improved, but processing complexity and latency increase
Solution Approach 1:
The patent implements dynamic TCI state indication where the TCI state for a CORESET is not fixed but can be changed via DCI signaling. The network can dynamically indicate which TCI state from a pre-configured list should be applied to the scheduled CORESET, allowing adaptive adjustment of QCL assumptions based on current channel conditions and scheduling requirements, thus improving scheduling flexibility while managing complexity through pre-configuration
Solution Approach 2:
The patent changes the TCI state parameter dynamically by introducing a TCI field in DCI format that carries an index to select from a pre-configured list of TCI states. This allows the system to switch between different QCL assumptions (different parameter sets) without reconfiguring the entire CORESET, achieving flexibility through parameter adjustment rather than structural changes
2Loss of time
If TCI states are dynamically indicated via DCI, then latency is reduced, but use of energy increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring a list of TCI states through higher-layer signaling (RRC) before dynamic scheduling occurs. This preparation phase allows the fast DCI signaling to only indicate a selection index rather than transmit full TCI state information, reducing latency while managing energy consumption by avoiding repeated transmission of redundant configuration data
Solution Approach 2:
The patent extracts the essential selection information (TCI state index) from the full TCI state configuration and transmits only this compact representation via DCI. The actual TCI state parameters are taken out and pre-configured, leaving only the selection indicator to be dynamically signaled, thus reducing both latency and energy usage compared to transmitting complete TCI state information dynamically
Data Source
AI summary
Aspects of the present disclosure relate to a technique for determining quasi co-location (QCL) and/or transmission configuration information (TCI) state assumption information for a dynamic control resource set (CORESET). A user equipment (UE) may receive and/or detect a downlink control information (DCI) that schedules at least one dynamic CORESET and indicates a TCI state from a list of one or more TCI states for the dynamic CORESET. The UE may apply the indicated TCI state for processing physical downlink control channel (PDCCH) transmissions in the dynamic CORESET when one or more conditions are met.