HARQ Feedback on PUSCH for Same-Slot DL-UL Scheduling
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Solution Overview
Problem
In wireless communications networks, the need for devices to monitor multiple downlink control information formats for uplink and downlink transmissions leads to high processing demands, particularly with increased subcarrier spacings, necessitating solutions to reduce power consumption and processing requirements.
Innovation Solution
Implementing a HARQ feedback mechanism where HARQ feedback for downlink transmissions is transmitted on the same PUSCH resource as the downlink transmissions, using a unified DCI or separate DCIs in the same PDCCH monitoring occasion to schedule both PDSCH and PUSCH resources, thereby reducing the need for separate PUCCH resources and PDSCH-to-HARQ_feedback timing indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple downlink control information formats are used for indicating downlink and uplink transmissions, then the network can support flexible scheduling and resource allocation, but the device processing complexity and power consumption increase significantly
Solution Approach 1:
The patent combines downlink control information for both downlink and uplink transmissions into a single unified DCI format. This merging approach maintains the network's ability to schedule both types of transmissions while reducing the device's monitoring burden from multiple DCI formats to one, thereby resolving the contradiction between scheduling flexibility and device processing complexity
Solution Approach 2:
The unified DCI format is designed to serve multiple functions simultaneously - it can indicate both downlink transmission parameters and uplink transmission parameters within the same message structure. This multi-functionality allows the network to maintain versatile scheduling capabilities while the device only needs to process a single DCI format type
2Reliability
If separate PUCCH resources are allocated for HARQ feedback transmission, then the feedback can be transmitted reliably, but the PUCCH resources are consumed and processing complexity increases
Solution Approach 1:
The patent merges HARQ feedback transmission with uplink data transmission by multiplexing feedback bits into the PUSCH channel. This eliminates the need for separate PUCCH resources while maintaining reliable feedback transmission, as the feedback is carried along with the uplink data in the same physical channel
Solution Approach 2:
The PUSCH channel is given multi-functionality by enabling it to carry both uplink data and HARQ feedback simultaneously. This eliminates the need for dedicated PUCCH resources while ensuring reliable feedback transmission, resolving the contradiction between resource conservation and transmission reliability
3Productivity
If PDSCH and PUSCH are scheduled in the same slot, then resource utilization is optimized, but the device processing demand and power consumption increase with increased subcarrier spacings
Solution Approach 1:
The patent combines the scheduling of PDSCH and PUSCH into a single DCI message that can allocate both downlink and uplink resources within the same slot. This unified scheduling approach maintains high resource utilization while reducing device processing complexity compared to monitoring separate DCI formats, thereby reducing power consumption even with increased subcarrier spacings
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for supporting acknowledgements for DL data transmitted on UL resources. One apparatus in a mobile communication network includes a processor and a transceiver that receives signaling information from a RAN node to schedule a first set of PDSCH resources and a first set of corresponding PUSCH resources, where the information to schedule the first set of PDSCH resources and the first set of PUSCH resources is transmitted in a same slot. The processor determines feedback information for a PDSCH transmission received from the RAN node using the first set of PDSCH resources and controls the transceiver to send feedback information for the PDSCH transmission to the RAN node using the first set of PUSCH resources.