Multiplexing HARQ Feedback for Multicast and Unicast PDSCH
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting and receiving wireless signals, particularly in multiple access systems where multiple users share system resources.
Innovation Solution
A method for transmitting hybrid automatic repeat request (HARQ) feedback information by a user equipment (UE) in a wireless communication system, involving the reception of multiple physical downlink control channels (PDCCHs) and physical downlink shared channels (PDSCHs), and the transmission of a single uplink signal multiplexing HARQ feedback information for each PDSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PDCCHs and PDSCHs are received for multicast and unicast scheduling, then the system supports diverse communication services, but the complexity of HARQ feedback transmission increases
Solution Approach 1:
The patent combines multiple HARQ feedback information (for both multicast and unicast PDSCHs) into a single uplink signal transmission. This merging approach reduces the number of separate feedback transmissions required, thereby simplifying the overall feedback mechanism while maintaining support for diverse communication services
Solution Approach 2:
The single uplink signal is designed to carry multiple types of HARQ feedback information simultaneously, making it a multi-functional transmission channel that handles both multicast and unicast feedback requirements through a unified mechanism
2Productivity
If HARQ feedback information is multiplexed in a single uplink signal, then transmission efficiency is improved, but the difficulty of managing different feedback modes increases
Solution Approach 1:
The patent segments the HARQ feedback information into distinct components (multicast feedback and unicast feedback) that are then multiplexed together. This segmentation allows the system to manage different feedback modes separately while transmitting them efficiently in a single uplink signal
Solution Approach 2:
The patent introduces an intermediary mechanism that handles the conversion and multiplexing of HARQ feedback from different modes. This intermediary layer simplifies the management complexity by providing a standardized interface for combining different feedback types
3Loss of energy
If ACK-only reporting mode is used for multicast PDSCH, then uplink resource usage is reduced, but the reliability of feedback transmission decreases
Solution Approach 1:
The patent implements a dynamic feedback mechanism where the feedback mode (ACK-only or ACK/NACK) can be flexibly selected and converted based on the specific transmission scenario. This dynamic approach allows the system to optimize between resource usage and reliability depending on the requirements of each transmission
Data Source
AI summary
According to an embodiment of the present disclosure, a user equipment (UE) may receive a multicast physical downlink shared channel (PDSCH) scheduled by first downlink control information (DCI), receive a unicast PDSCH scheduled by the second DCI, and transmit a single uplink signal on which HARQ feedback information on each of the multicast PDSCH and the unicast PDSCH is multiplexed.