Multi-PDSCH Reception Using Pre-configured Spatial QCL Information
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing multiple physical downlink shared channels (PDSCHs) due to resource shortages and the need for higher data rates, requiring advanced methods for beam management and scheduling to support increased data traffic and low latency.
Innovation Solution
A method is introduced for defining default quasi co-location (QCL) information to enable the reception of multiple PDSCHs in a multi-PDCCH based independent layer joint transmission (ILJT) operation, where user equipment (UE) transmits capability information about supported reception beams and receives PDSCHs using pre-configured spatial QCL information, allowing for simultaneous reception from multiple beams without ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCHs are scheduled before beam change time, then resource utilization is improved, but reception reliability deteriorates due to beam switching conflicts
Solution Approach 1:
The patent applies preliminary action by pre-configuring spatial QCL information in advance before beam changes are needed. The UE receives and stores spatial QCL information from PDCCHs before the actual beam change occurs, ensuring that when multiple PDSCHs are scheduled, the UE already has the necessary spatial configuration ready, thus maintaining reception reliability while enabling efficient resource utilization.
Solution Approach 2:
The patent segments the reception process by distinguishing between different time locations relative to beam change time. It separately handles PDSCHs scheduled before beam change time (using pre-configured spatial QCL information) and those scheduled after (using updated beam information). This segmentation resolves the conflict between resource utilization and reception reliability by applying appropriate handling methods to each segment.
2Measurement precision
If spatial QCL information is updated for each PDSCH, then reception accuracy is improved, but processing time increases causing latency
Solution Approach 1:
The patent applies preliminary action by pre-configuring spatial QCL information in advance before beam changes are needed. The UE receives and stores spatial QCL information from PDCCHs before the actual beam change occurs, ensuring that when multiple PDSCHs are scheduled, the UE already has the necessary spatial configuration ready, thus maintaining reception reliability while enabling efficient resource utilization.
Solution Approach 2:
The patent applies partial action by selectively updating spatial QCL information only when necessary (for PDSCHs after beam change time) while reusing pre-configured information for PDSCHs before beam change time. This partial approach avoids unnecessary processing overhead while maintaining sufficient reception accuracy, thus reducing latency without compromising quality.
3Adaptability or versatility
If UE supports multiple reception beams simultaneously, then capacity to handle multiple PDSCHs is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the UE's beam handling capability flexible and configurable. Instead of requiring permanently complex multi-beam hardware, the system dynamically configures the UE to support either single-beam or multi-beam operation based on capability indication and network configuration. This allows the UE to adapt its complexity level to match actual service requirements, improving capacity when needed while maintaining simplicity during normal operation.
Data Source
AI summary
The present specification proposes a method for transceiving a plurality of PDSCHs in a wireless communication system and an apparatus therefor. Specifically, a method performed by a user equipment (UE) may comprise the steps of: transmitting UE capability information related to the number of beams received that can be simultaneously supported; receiving a plurality of physical downlink control channels (PDCCH) comprising PDSCH scheduling information; and receiving the plurality of PDSCHs by using preset spatial quasi co-location (QCL) information on the basis of at least one PDSCH scheduled within the time required to apply the spatial QCL information.