HARQ-ACK Feedback Delay Extension for Short-Slot 5G NR
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Solution Overview
Problem
The existing 5G NR protocol limits the feedback delay for Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) to a maximum of 15 slots, which is insufficient for high-band communication systems with shorter slot durations, leading to incomplete demodulation and generation of HARQ-ACK information.
Innovation Solution
Expand the range of feedback delay indication values for HARQ-ACK beyond 15 to accommodate different subcarrier spacings, allowing more slots for demodulation and generation of HARQ-ACK information by configuring a set of candidate feedback delay indication values that includes integers greater than 15, tailored to the specific capabilities and requirements of user equipment (UE).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedback delay for HARQ-ACK is limited to a maximum of 15 slots, then the system maintains compatibility with existing 5G NR protocols, but the system cannot accommodate high-band communication systems with shorter slot durations leading to incomplete demodulation and generation of HARQ-ACK information
Solution Approach 1:
The patent changes the parameter range of feedback delay indication values for HARQ-ACK from the traditional 0-15 to include values greater than 15. This parameter extension allows the system to accommodate high-band communication systems with shorter slot durations while maintaining compatibility with existing protocols through the same DCI format and RRC configuration mechanisms.
2Productivity
If the maximum k1 value is set to 15, then the configuration complexity is reduced and existing protocols are maintained, but user equipment cannot complete demodulation and generation of HARQ-ACK information in high-band systems with shorter slot durations
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the feedback delay indication values to be configured based on specific communication scenarios and UE capabilities. The base station can dynamically select appropriate k1 values from an expanded range and configure them through RRC parameters, enabling the system to adapt to different slot durations in high-band systems while maintaining flexibility for various deployment scenarios.
3Reliability
If the set of candidate feedback delay indication values includes integers greater than 15, then user equipment has sufficient time for demodulation and generation of HARQ-ACK information in high-band systems, but the configuration and management of feedback delay values becomes more complex
Solution Approach 1:
The patent segments the feedback delay configuration into two parts: a predefined set of candidate values (including values >15) and a selected subset actually used in practice. The base station configures a comprehensive candidate set through RRC parameters, then selectively activates specific values based on channel conditions and UE capabilities, reducing the actual management complexity while maintaining the expanded range for high-band systems.
Data Source
AI summary
A communication method, includes: receiving first configuration information, wherein the first configuration information includes a set of feedback delay indication values for a hybrid automatic repeat request acknowledgment, the set of feedback delay indication values is a subset of a set of candidate feedback delay indication values for the hybrid automatic repeat request acknowledgment, and the set of candidate feedback delay indication values includes an integer greater than 15.