DCI First Field for HARQ-ACK Feedback Indication
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Solution Overview
Problem
In wireless communications systems, the dynamic codebook-based HARQ-ACK reporting mechanism leads to higher bit overheads and inconsistent feedback understanding between UE and network devices, particularly when multiple PDSCH groups require simultaneous feedback, resulting in lower reliability of receiving feedback information and impacting data transmission performance.
Innovation Solution
The method involves using a first field in the DCI to indicate whether HARQ-ACK information for PDSCH groups is carried on an uplink control channel, where the number of bits M is less than the maximum number of PDSCH groups P, allowing the UE to determine which groups need to send feedback, reducing bit overheads and improving DCI detection success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE sends HARQ-ACK information for multiple PDSCH groups using the dynamic codebook-based reporting mechanism, then the feedback information covers more PDSCH groups, but the bit overhead increases and the reliability of feedback reception decreases
Solution Approach 1:
The patent segments the feedback reporting by introducing a first field in DCI that separately indicates whether HARQ-ACK information for at least one PDSCH group is carried on a first uplink control channel. This segmentation allows the network device to selectively request feedback for specific PDSCH groups rather than requiring feedback for all groups, thereby reducing bit overhead while maintaining necessary feedback coverage.
2Quantity of substance
If the first field occupies M bits where M is less than P (maximum number of PDSCH groups), then the bit overhead in DCI is reduced, but the indication capability for PDSCH groups is limited
Solution Approach 1:
The patent implements a dynamic feedback mechanism where the first field in DCI dynamically indicates which PDSCH groups require HARQ-ACK feedback. The network device can flexibly configure the first field to indicate different combinations of PDSCH groups based on current transmission needs, allowing adaptive control of feedback requirements without being constrained by a fixed bit allocation for each PDSCH group.
Solution Approach 2:
The first field in DCI serves multiple functions: it indicates whether HARQ-ACK information for at least one PDSCH group is carried on the first uplink control channel, and it enables the network device to selectively request feedback for different PDSCH groups. This multi-functional design allows the limited M bits to provide versatile indication capability across multiple PDSCH groups through combinatorial encoding.
3Reliability
If more radio resources are allocated for DCI transmission to improve detection success rate, then the DCI detection reliability improves, but the system resource consumption increases
Solution Approach 1:
The patent extracts only the essential feedback indication information into the first field of DCI, separating it from the full HARQ-ACK feedback content. By using the first field to selectively indicate which PDSCH groups require feedback, the system transmits minimal necessary control information, reducing DCI size and associated radio resource consumption while maintaining detection reliability for critical feedback indications.
Data Source
AI summary
Embodiments of this disclosure provide a method for feedback control, UE, and a network device. Specifically, the method for feedback control includes: receiving, by the UE, first downlink control information DCI from a network device, where the first DCI includes a first field, and the first field is used to indicate whether hybrid automatic repeat request acknowledgment HARQ-ACK information for at least one physical downlink shared channel PDSCH group is carried on a first uplink control channel for transmission. The first uplink control channel is indicated by the first DCI, the first field occupies M bits, M is a positive integer less than P, and P is a maximum number of PDSCH groups applicable to the UE. The method is specifically applied to a scenario in which the UE sends feedback information to the network device.