IoT NTN HARQ Feedback Disablement to Prevent Feedback Stalling
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Solution Overview
Problem
In IoT NTN, HARQ feedback stalling leads to decreased data rates and increased power consumption, necessitating the disabling of HARQ feedback to mitigate these issues.
Innovation Solution
Implement signaling mechanisms to enable/disable HARQ feedback dynamically or semi-statically, including configuration per HARQ process, DCI-based dynamic disabling, and hybrid signaling, along with HARQ-ACK reporting adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled to verify communications between base stations and UEs, then communication reliability is improved, but data rates decrease and power consumption increases due to feedback stalling
Solution Approach 1:
The patent implements dynamic HARQ feedback disabling mechanisms where the base station can send DCI indicators to UEs to temporarily disable HARQ feedback for specific downlink transmissions. This allows the system to adaptively switch between HARQ-enabled and HARQ-disabled modes based on channel conditions and traffic requirements, resolving the contradiction by making the feedback mechanism flexible rather than static
Solution Approach 2:
The patent changes the operational parameters of HARQ feedback by introducing configuration options that allow dynamic adjustment of feedback behavior. Through RRC signaling and DCI indicators, the system can modify HARQ process parameters such as feedback timing, feedback enabled/disabled state, and associate specific HARQ process IDs with feedback disabling, thereby optimizing data rates while maintaining necessary reliability
2Reliability
If HARQ feedback is enabled to ensure proper reception verification, then communication reliability is improved, but power consumption increases due to continuous feedback monitoring and transmission
Solution Approach 1:
The patent implements periodic or selective HARQ feedback transmission rather than continuous feedback. By allowing the base station to periodically disable HARQ feedback through DCI indicators for specific transmissions or time periods, the system reduces the frequency of feedback operations while maintaining reliability when needed, thereby reducing power consumption associated with continuous feedback monitoring and transmission
Solution Approach 2:
The patent extracts the HARQ feedback mechanism from being a mandatory continuous operation and makes it optional and selective. By enabling the base station to disable HARQ feedback for specific downlink transmissions through DCI indicators, the system removes the harmful continuous feedback requirement while preserving the beneficial reliability aspects when HARQ is actively enabled
3Productivity
If HARQ feedback is disabled to increase data rates and reduce power consumption, then productivity is improved, but communication verification capability is reduced
Solution Approach 1:
The patent segments the HARQ feedback mechanism by introducing per-HARQ-process control rather than system-wide enabling/disabling. Through RRC signaling, the system can configure specific HARQ process IDs to have feedback disabled while other processes maintain normal feedback operation, allowing selective optimization of data rates for specific processes without compromising verification capability for other processes
4Adaptability or versatility
If dynamic HARQ feedback disabling is implemented through DCI signaling, then adaptability is improved, but device complexity increases due to additional signaling processing
Solution Approach 1:
The patent makes the existing DCI structure multi-functional by adding a feedback disabling indicator field to the DCI format used for downlink scheduling. This allows the same DCI message to simultaneously perform scheduling functions and HARQ feedback control functions, increasing adaptability without requiring separate dedicated signaling messages, thereby limiting the increase in processing complexity
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide hybrid automatic repeat request disablement in wireless communication systems.