Joint DCI Count Signaling for Reliable HARQ-ACK Feedback
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Solution Overview
Problem
In 5G NR systems, incorrect feedback information is generated due to failed DCI decoding, leading to misinterpretation of the number of DCI pieces and incorrect feedback, especially in scenarios involving carrier aggregation and self-scheduling modes.
Innovation Solution
The method involves obtaining and sending DCI that carries count information, including joint and single scheduling DCI, to ensure both the user and network sides have a consistent understanding of the number of DCI, thereby improving feedback reliability by using count information fields in the DCI to determine the correct HARQ-ACK codebook size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the terminal uses blind detection to decode DCI without count information, then the terminal can autonomously determine scheduling information, but the terminal may generate incorrect feedback information when DCI decoding fails
Solution Approach 1:
The patent introduces a feedback mechanism where the network side device sends count information (cDAI and tDAI) to the terminal through DCI. The terminal uses this feedback information to determine the correct codebook size and generate accurate HARQ-ACK feedback, even when some DCI messages are missed during blind detection. This resolves the contradiction by providing the terminal with the information needed to maintain reliable feedback generation despite autonomous decoding limitations.
Solution Approach 2:
The count information (cDAI and tDAI) acts as an intermediary that bridges the gap between the network side device's scheduling decisions and the terminal's autonomous decoding. This intermediary provides the terminal with the necessary context to correctly interpret the number of scheduled cells and generate accurate feedback, eliminating the reliability issue while preserving automation.
2Adaptability or versatility
If the terminal performs blind detection of multiple DCI messages, then the terminal can receive scheduling information for multiple CCs, but the terminal cannot accurately determine the number of DCI pieces when decoding fails
Solution Approach 1:
The patent employs feedback through count information (cDAI and tDAI) embedded in DCI messages to enable the terminal to accurately determine the number of DCI pieces. The cDAI provides cumulative counting information while tDAI provides total counting information, allowing the terminal to precisely measure the DCI count even when performing blind detection across multiple CCs, thus maintaining measurement precision while preserving adaptability.
3Adaptability or versatility
If the network configures multiple CORESET and SS for each CC, then the network can flexibly schedule downlink data, but the terminal complexity increases due to multiple blind detections
Solution Approach 1:
The count information (cDAI and tDAI) provides feedback that simplifies the terminal's detection process by eliminating the need to independently track and count DCI messages across multiple CORESET and SS configurations. The terminal can rely on the provided count information to determine the correct codebook size, reducing terminal complexity while maintaining the network's scheduling flexibility.
Data Source
AI summary
An information transmission method includes: obtaining first downlink control information (DCI) for joint uplink scheduling, the first DCI carries count information of joint scheduling DCI and count information of single scheduling DCI; where the joint scheduling DCI is DCI for scheduling a plurality of uplinks or downlinks, and the single scheduling DCI is DCI for scheduling only one uplink or downlink.