HARQ-ACK Reporting Using DAI for Priority Bit Reliability
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Solution Overview
Problem
The transmission reliability of high-priority HARQ-ACK bits is compromised when multiplexed with low-priority HARQ-ACK bits in wireless communication systems, leading to inconsistent understanding and incorrect decoding at the base station.
Innovation Solution
A method involving the use of Downlink Assignment Index (DAI) fields to determine the number of HARQ-ACK bits, with configurable reference values, ensures consistent understanding and reliable transmission by adjusting DCI signaling overhead based on scenario-specific configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-ACK bits with different priorities are multiplexed into the same PUCCH or PUSCH, then resource utilization is improved, but the transmission reliability of high-priority HARQ-ACK bits deteriorates
Solution Approach 1:
The patent segments HARQ-ACK bits into different priority levels (first priority and second priority) and processes them separately. The method identifies high-priority HARQ-ACK bits and low-priority HARQ-ACK bits, then applies different handling mechanisms to each group, ensuring that high-priority bits maintain reliable transmission while still allowing multiplexing of low-priority bits to improve resource utilization.
Solution Approach 2:
The patent applies different quality levels of protection to different parts of the HARQ-ACK bit stream. High-priority HARQ-ACK bits receive enhanced protection through separate processing and transmission mechanisms, while low-priority bits are handled with standard processing. This local differentiation ensures that critical information maintains high reliability while overall system efficiency is improved.
2Measurement precision
If DAI field is added to DCI to indicate number of HARQ-ACK bits, then understanding consistency between communication parties is improved, but DCI signaling overhead increases
Solution Approach 1:
The patent employs preliminary actions by pre-configuring the UE with reference values and processing rules through higher-layer signaling before actual data transmission. The UE is pre-instructed on how to determine the number of HARQ-ACK bits based on downlink assignment information, eliminating the need for explicit DAI fields in DCI while ensuring consistent understanding between communication parties.
Solution Approach 2:
The patent enables the UE to self-determine the number of HARQ-ACK bits by using reference values and processing rules that are autonomously configured through higher-layer signaling. The UE independently calculates the correct number of bits based on the downlink assignment index and configured parameters, without requiring additional signaling fields, thus achieving consistent understanding while minimizing overhead.
Data Source
AI summary
Method and device in nodes for wireless communication. A first receiver receives a first information block and a first signaling, the first information block is used to determine whether the first signaling comprises a target DAI field; a first transmitter transmits a target bit block in a first physical-layer channel, of a first bit block or a second bit block, at least the second bit block is used to generate the target bit block; wherein the first signaling is used to determine resources occupied by the first physical-layer channel; a first reference value is a default or configurable non-negative integer; when the first signaling does not comprise the target DAI field, the first bit block is used to generate a third bit block, the third bit block comprises at least one bit, a number of bit(s) comprised in the third bit block is equal to the first reference value.