HARQ Feedback Codebook Grouping via New Feedback Indicators
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Solution Overview
Problem
In mobile communication systems, the existing methods for HARQ feedback information transmission are inefficient due to high transmission overhead caused by the need for explicit new data indicators (NDI) to avoid ambiguity in feedback information, leading to increased signaling complexity and resource utilization issues.
Innovation Solution
The proposed solution involves using a feedback codebook that includes feedback information for multiple HARQ processes transmitted through physical channels, where new feedback indicators (NFIs) are used to distinguish between different feedback groups, reducing the number of required feedback groups and thus lowering the overhead of uplink control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NDI information is used for each HARQ process to avoid feedback ambiguity, then feedback reliability is improved, but transmission overhead increases
Solution Approach 1:
The patent segments HARQ processes into multiple groups, where each group is identified by a group ID. Instead of assigning NDI to every individual HARQ process, NDI is applied at the group level. This segmentation reduces the number of NDI bits required while maintaining feedback reliability through the group-based identification mechanism.
Solution Approach 2:
The group ID serves multiple functions: it identifies the group to which a HARQ process belongs, and it enables the NDI to operate at the group level rather than individual process level. This multi-functionality allows the system to reduce overhead while preserving the ability to distinguish feedback for different processes within the same group.
2Measurement precision
If NDI information is transmitted for each HARQ process, then feedback accuracy is improved, but signaling complexity increases
Solution Approach 1:
By segmenting HARQ processes into groups and applying NDI at the group level, the patent reduces the number of signaling elements required. The feedback accuracy is maintained because the group ID provides additional identification information that compensates for the coarser NDI granularity.
Solution Approach 2:
The patent merges the group ID and NDI into a unified feedback structure where the group ID identifies the process group and the NDI indicates whether new data is being transmitted for that group. This combination reduces signaling complexity while preserving feedback accuracy through the joint use of group identification and new data indication.
3Productivity
If feedback groups are reduced using NFI, then resource utilization efficiency is improved, but feedback information distinction capability must be maintained
Solution Approach 1:
The patent segments HARQ processes into a limited number of groups identified by group IDs. This segmentation allows the system to reduce the number of feedback groups (improving resource utilization) while maintaining distinction capability through the combination of group ID and NFI (new feedback indicator) mechanisms.
Solution Approach 2:
The group ID acts as an intermediary between the individual HARQ processes and the reduced set of feedback groups. It enables the system to map multiple processes to fewer feedback groups while preserving the ability to distinguish feedback for different processes through the group-based identification and NFI toggling mechanism.
Data Source
AI summary
A transmitting method and a receiving method for feedback information, a device, a terminal device, and a medium are provided. The method includes: receiving first signaling, where the first signaling carries N new feedback indicators (NFIs), the N NFIs correspond to N groups in one-to-one, and N is a positive integer; and transmitting a feedback codebook, where the feedback codebook comprises first feedback information corresponding to a first HARQ process, the first HARQ process is transmitted through a physical channel in a first group with a first value of NFI, the first group is one of the N groups, and the first value is the value of NFI corresponding to the first group among the N NFIs. Therefore, understanding ambiguity of the feedback information between the terminal device and the access network equipment is avoided, and utilization efficiency of transmitted resources is improved.