Semi-Persistent Scheduling Beam Selection via DCI Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in determining optimal beams for semi-persistent scheduling (SPS) configurations, particularly when scheduling offsets and transmission configuration indicator (TCI) states change, leading to inefficiencies in resource allocation and signal transmission.
Innovation Solution
The system employs a method where user equipment (UE) and base stations use downlink control information (DCI) to activate SPS configurations, determining beams based on scheduling offsets and TCI state changes, ensuring that SPS transmissions align with threshold time durations and adapt to changes in TCI mappings, thereby optimizing beam usage and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If beams are determined using fixed TCI states for SPS configurations, then resource allocation is simplified, but beam adaptability to changing channel conditions deteriorates
Solution Approach 1:
The patent implements dynamic beam determination by allowing the UE to select beams based on real-time conditions. Specifically, when the scheduling offset satisfies a threshold condition, the UE uses the TCI state of the CORESET carrying the DCI; when the offset does not satisfy the threshold, the UE uses a default TCI state. This dynamic selection mechanism enables the system to adapt beam configurations to changing channel conditions while maintaining resource allocation efficiency.
2Reliability
If beams are dynamically adjusted based on scheduling offsets and TCI state changes, then signal transmission quality is improved, but determination complexity increases
Solution Approach 1:
The patent enables the UE to autonomously determine the appropriate beam for receiving SPS transmissions without requiring additional network coordination. The UE independently evaluates the scheduling offset against a threshold and selects the corresponding TCI state based on pre-configured parameters. This self-service approach improves signal transmission quality through adaptive beam selection while avoiding the complexity of continuous network-UE interaction for beam management.
3Measurement precision
If the scheduling offset threshold condition is used to determine beam selection, then beam selection accuracy is improved, but processing time increases
Solution Approach 1:
The patent employs preliminary action by pre-configuring threshold values and TCI state mappings before SPS transmissions occur. The network provides the UE with threshold configurations and TCI state associations in advance, allowing the UE to quickly compare the scheduling offset against the pre-set threshold and immediately select the appropriate beam without performing complex real-time analysis. This approach maintains high beam selection accuracy while minimizing processing time.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive downlink control information (DCI) that activates a semi-persistent scheduling (SPS) configuration. The UE may receive SPS transmissions in a plurality of SPS occasions that are according to the SPS configuration using at least one beam that is based at least in part on: whether a scheduling offset between the DCI and the plurality of SPS occasions satisfies a threshold time duration, whether a transmission configuration indicator (TCI) state, associated with a control resource set that carries the DCI and is used to determine the at least one beam, changes while the SPS configuration is active, or whether a mapping of a TCI identifier, indicated by the DCI, to one or more TCI states changes while the SPS configuration is active. Numerous other aspects are described.