PDSCH Reception Using Aperiodic ZP CSI-RS Triggering
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Solution Overview
Problem
The existing 5G NR systems face challenges in efficiently handling physical downlink shared channel (PDSCH) reception for both multicast and unicast transmissions, particularly in managing zero-power (ZP) CSI-RS resources, which affects the flexibility and efficiency of wireless communication.
Innovation Solution
A method and user equipment (UE) are developed to handle PDSCH reception by configuring aperiodic resource sets for ZP CSI-RS, allowing the UE to determine unavailable ZP CSI-RS resources based on specific fields in the DCI, thereby optimizing the reception of multicast and unicast PDSCH configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate PDSCH configurations are used for multicast and unicast transmissions, then transmission flexibility is improved, but device complexity increases due to managing multiple configurations and resource sets
Solution Approach 1:
The patent divides PDSCH configurations into separate multicast-specific and unicast-specific configurations, each with their own aperiodic resource sets. This segmentation allows independent optimization of each transmission type while managing complexity through clear separation of concerns.
Solution Approach 2:
The patent introduces dynamic triggering mechanisms where DCI fields can activate or deactivate specific aperiodic resource sets based on transmission type. This dynamic approach allows the system to adapt resource allocation in real-time without permanently configuring all possible resource sets, reducing overall complexity.
2Productivity
If resource configuration is included in unicast PDSCH configuration but absent in multicast PDSCH configuration, then multicast efficiency is improved, but measurement precision deteriorates due to lack of ZP CSI-RS resource information
Solution Approach 1:
The patent pre-configures aperiodic resource sets for multicast PDSCH even though they are not explicitly triggered in multicast DCI. This preliminary configuration ensures that when channel state information measurement is needed, the necessary ZP CSI-RS resources are already available, maintaining measurement precision while improving multicast efficiency.
Solution Approach 2:
The patent uses DCI fields as intermediaries that can indirectly indicate the activation of aperiodic resource sets configured for multicast. This intermediary mechanism allows the system to maintain separate configuration structures while still enabling precise channel state information measurement through the DCI triggering mechanism.
3Adaptability or versatility
If DCI fields are used to trigger aperiodic ZP CSI-RS, then resource allocation flexibility is improved, but information processing complexity increases due to additional field interpretation
Solution Approach 1:
The patent designs DCI fields to serve multiple functions: they can trigger aperiodic resource sets for both unicast and multicast transmissions, and can indicate different types of resource allocations. This multi-functionality reduces the need for separate triggering mechanisms, actually simplifying overall processing despite the increased flexibility.
Solution Approach 2:
The patent utilizes existing DCI field structures and repurposes or modifies parameter interpretations to trigger aperiodic resource sets. By changing how existing parameters are interpreted rather than adding entirely new complex structures, the patent achieves flexibility while minimizing processing complexity increases.
Data Source
AI summary
A method by a UE for handling PDSCH reception includes receiving, from a BS, a first PDSCH configuration in a CFR configuration for a multicast PDSCH, a second PDSCH configuration in a BWP configuration for a unicast PDSCH, and first DCI scheduling the multicast PDSCH, the first PDSCH configuration including a first aperiodic resource set configuration, the second PDSCH configuration including a resource configuration and a second aperiodic resource set configuration, the resource configuration for configuring one or more ZP CSI-RS resources, and the first DCI including a first field for triggering a first aperiodic ZP CSI-RS; and determining, based on the first field, a first ZP CSI-RS resource set, which is not available for reception of the multicast PDSCH, from a first list of ZP CSI-RS resource sets configured by the first aperiodic resource set configuration. The resource configuration is absent in the first PDSCH configuration.