HARQ Feedback Grouping for Multi-Slot PDSCH
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently providing hybrid automatic repeat request (HARQ) feedback for multiple physical downlink shared channel (PDSCH) transmissions across multiple slots, particularly in higher frequency ranges like FR2+, due to increased processing complexity and latency caused by higher subcarrier spacings, leading to inefficient resource use and reduced performance.
Innovation Solution
The implementation of different HARQ feedback schemes, such as using a single physical uplink control channel (PUCCH) resource, encoding schemes, or joint HARQ-ACKs, allows for efficient acknowledgment of multiple PDSCH transmissions, reducing interference and overhead, and improving spectral efficiency by grouping PDSCHs based on conditions like time arrival, priority, and modulation and coding scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate PUCCH resources are used for HARQ feedback of each PDSCH transmission, then each transmission can be acknowledged individually, but resource overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent combines multiple HARQ feedback transmissions into a single PUCCH resource by grouping PDSCH transmissions and using joint encoding schemes. This merging approach reduces the number of separate feedback channels needed while maintaining individual acknowledgment capability for each grouped transmission, thereby reducing resource overhead and improving spectral efficiency.
Solution Approach 2:
The patent creates a universal PUCCH resource that can handle HARQ feedback for multiple different PDSCH transmissions simultaneously. This multi-functional approach allows a single feedback channel to serve multiple data transmission purposes, reducing the need for dedicated feedback resources for each individual PDSCH and improving overall resource utilization.
2Reliability
If separate HARQ feedback is provided for each PDSCH transmission across multiple slots, then each transmission can be independently acknowledged, but latency increases due to multiple feedback opportunities
Solution Approach 1:
The patent merges multiple feedback opportunities into a single consolidated feedback transmission. By grouping PDSCH transmissions and providing joint HARQ feedback, the system reduces the number of separate feedback events, thereby decreasing overall feedback latency while still maintaining the ability to independently acknowledge each grouped transmission.
Solution Approach 2:
The patent prepares for multiple PDSCH transmissions in advance by establishing grouping criteria and encoding schemes before the transmissions occur. This preliminary organization allows the system to efficiently consolidate feedback for multiple transmissions into a single event, reducing the time required for individual feedback processing and transmission.
3Ease of manufacture
If traditional HARQ feedback schemes are used for multi-slot PDSCH, then implementation is straightforward, but processing complexity increases due to higher subcarrier spacings in FR2+
Solution Approach 1:
The patent segments the complex task of handling multiple PDSCH feedbacks into manageable components: grouping PDSCH transmissions based on criteria, selecting appropriate encoding schemes, and organizing feedback timing. This segmentation breaks down the processing complexity into discrete, manageable steps that are easier to implement even in high-frequency environments with tight timing constraints.
Solution Approach 2:
The patent introduces dynamic elements to the HARQ feedback process, including adaptive grouping of PDSCH transmissions and flexible selection of encoding schemes based on channel conditions and traffic patterns. This dynamic approach allows the system to optimize processing complexity in real-time, adapting to the challenging FR2+ environment while maintaining implementation feasibility.
Data Source
AI summary
Techniques and apparatus for providing hybrid automatic repeat request (HARQ) feedback for multiple physical downlink shared channel (PDSCH) transmissions are described. One example technique involves receiving downlink control information (DCI) scheduling a plurality of downlink data transmissions across a plurality of slots. The plurality of downlink data transmissions are monitored across the plurality of slots. At least one HARQ feedback scheme for acknowledging the plurality of downlink data transmissions is determined. HARQ feedback for the plurality of downlink data transmissions is provided in accordance with the at least one HARQ feedback scheme.