HARQ Feedback Resource Mapping for Multiple SPS PDSCHs
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Solution Overview
Problem
Existing methods in 5G mobile communications systems struggle to ensure smooth transmission of HARQ feedback information for multiple semi-persistent scheduling (SPS) PDSCHs, leading to unreliable and delayed data transmission due to limited uplink control channel capacity.
Innovation Solution
A method is introduced to configure multiple transmission parameter groups for SPS configurations, allowing the terminal device to determine appropriate resources for HARQ feedback, ensuring that feedback information for multiple PDSCHs can be sent within a single uplink slot, thereby improving reliability and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback information is transmitted using existing methods, then the feedback can be sent, but the spectral efficiency is low and system performance is limited
Solution Approach 1:
The patent maps HARQ feedback information onto the time dimension by selecting different uplink slots for transmission based on the timing of the downlink data. This temporal dimensionality change allows flexible adaptation to varying channel conditions and traffic patterns, thereby improving spectral efficiency without compromising reliability.
Solution Approach 2:
The patent dynamically selects the uplink transmission slot based on real-time channel conditions, downlink data timing, and uplink data availability. This dynamic adaptation enables the system to optimize spectral efficiency under different operating conditions while maintaining reliable feedback transmission.
2Loss of time
If HARQ feedback is transmitted in earlier uplink slots, then latency is reduced, but uplink data transmission opportunities are lost
Solution Approach 1:
The patent applies partial action by selectively transmitting HARQ feedback only when uplink data is unavailable or when the timing allows without compromising data transmission opportunities. This partial feedback transmission approach reduces latency for critical cases while preserving uplink data transmission capacity for other scenarios.
Solution Approach 2:
The patent dynamically determines whether to transmit HARQ feedback in a given uplink slot based on the presence of uplink data and channel conditions. This dynamic decision-making process balances the trade-off between reducing feedback latency and maintaining uplink data transmission opportunities.
3Productivity
If multiple devices transmit HARQ feedback simultaneously, then feedback efficiency improves, but collisions occur and reliability decreases
Solution Approach 1:
The patent segments the feedback transmission opportunity by assigning different uplink slots to different devices based on their respective downlink data timing and uplink data status. This segmentation of the time resource prevents simultaneous transmissions and eliminates collisions, thereby maintaining reliability while achieving efficient feedback delivery.
Solution Approach 2:
The patent dynamically assigns uplink slots to different devices based on real-time conditions including downlink data timing, uplink data availability, and potential collision risks. This dynamic slot assignment optimizes feedback transmission efficiency while preventing collisions that would compromise reliability.
Data Source
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AI summary
This application provides a method for transmitting hybrid automatic repeat request HARQ feedback information and a communications apparatus. A terminal device receives K downlink data channels. Each of the K downlink data channels has a corresponding transmission parameter group, and at least two downlink data channels correspond to different transmission parameter groups. The terminal device determines a first transmission resource based on first information including M transmission parameter groups, where both K and M are integers greater than or equal to 2, and sends, on the first transmission resource, HARQ feedback information corresponding to the K downlink data channels, so that a plurality of pieces of HARQ feedback information can be smoothly fed back. This helps improve service transmission reliability.