MBS PDSCH Processing Capability Segmentation for HARQ Feedback
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently processing multicast and broadcast services (MBS) physical downlink shared channels (PDSCHs), particularly in distinguishing between different processing capabilities and providing accurate hybrid automatic repeat request (HARQ) feedback based on these capabilities.
Innovation Solution
The system includes mechanisms for a user equipment (UE) and base station to receive and transmit indications about the association of MBS PDSCHs with specific processing capabilities, using group radio network temporary identifiers (G-RNTI) and cell radio network temporary identifiers (C-RNTI) for CRC scrambling, allowing for HARQ-ACK feedback in accordance with either the first or second PDSCH processing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the system uses a single PDSCH processing capability for all PDSCHs, then the system complexity is reduced, but the processing efficiency and accuracy for MBS services deteriorates
Solution Approach 1:
The patent segments PDSCH processing into two distinct capabilities: first PDSCH processing capability for unicast PDSCHs and second PDSCH processing capability for MBS PDSCHs. This segmentation allows each capability to be optimized independently, with the second capability specifically tuned for MBS service requirements such as shorter processing timelines and different DMRS configurations, thereby improving processing efficiency without unnecessarily complicating the overall system through a unified approach
2Productivity
If the system implements separate first and second PDSCH processing capabilities, then the processing efficiency for MBS services is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic capability indication where the base station transmits indication information in DCI to signal which PDSCH processing capability should be used for each MBS PDSCH. This dynamic approach allows the system to adaptively switch between processing capabilities based on service requirements, improving MBS processing efficiency while managing device complexity through standardized indication mechanisms rather than requiring permanent dual-processing architectures
Solution Approach 2:
The patent applies different processing capabilities to different PDSCH types based on their specific requirements. The second PDSCH processing capability with its shorter timeline and specific DMRS configurations is applied locally to MBS PDSCHs where it is needed, while unicast PDSCHs continue to use the first capability. This localized application optimizes performance for MBS services without unnecessarily increasing complexity across the entire system
3Loss of time
If the system uses shorter processing timeline for MBS PDSCHs, then the service responsiveness is improved, but the processing reliability may deteriorate
Solution Approach 1:
The patent changes key processing parameters for the second PDSCH capability including shorter processing timelines and different DMRS configurations specifically for MBS services. These parameter changes are optimized for MBS requirements while maintaining sufficient processing time through coordinated design of the indication mechanism and feedback timing, thereby improving service responsiveness without compromising processing reliability
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, an indication that indicates whether a multicast and broadcast service (MBS) physical downlink shared channel (PDSCH) scheduled by downlink control information (DCI) is associated with a second PDSCH processing capability, wherein the second PDSCH processing capability has a shorter duration than a first PDSCH processing capability. The UE may receive, from the base station, the MBS PDSCH scheduled by the DCI. The UE may transmit, to the base station and based at least in part on the indication, hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback in accordance with the first PDSCH processing capability or the second PDSCH processing capability. Numerous other aspects are described.