PUSCH Transmission Ignoring HARQ State for NTN Configured Grants
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing physical uplink shared channel (PUSCH) transmissions based on configured grants (CGs), particularly in non-terrestrial networks (NTNs) where timing advances can lead to significant frame timing offsets.
Innovation Solution
The method involves receiving a HARQ state configuration for a set of HARQ processes over RRC signaling and a configured grant for a PUSCH transmission. The system performs a PUSCH transmission based on the configured grant for a HARQ process associated with the grant, without considering at least part of the HARQ state configuration for that HARQ process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system considers the HARQ state configuration for PUSCH transmission based on configured grant, then the communication reliability is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent extracts the HARQ state configuration consideration from the PUSCH transmission based on configured grant (CG) procedure. Specifically, the UE ignores the HARQ state configuration (such as HARQ-ACK transmission timing and PUCCH resource allocation) when performing PUSCH transmission on configured grant resources, thereby simplifying the processing while maintaining reliability through alternative mechanisms
Solution Approach 2:
The patent segments the uplink transmission procedures by distinguishing between dynamic grant (DG) and configured grant (CG) resources. For CG resources, a simplified transmission mode is applied that excludes HARQ state configuration considerations, while DG resources continue to use the full HARQ procedure. This segmentation allows the system to optimize each transmission type independently
2Reliability
If the system applies HARQ state configuration for all PUSCH transmissions, then the communication reliability is improved, but the loss of time due to processing overhead increases
Solution Approach 1:
The patent applies partial action by selectively applying HARQ state configuration only to dynamic grant (DG) PUSCH transmissions while excluding configured grant (CG) transmissions. This partial application reduces the overall processing time and complexity in the system, particularly for CG-based transmissions which are used for time-critical applications in NTN environments
3Reliability
If the system considers HARQ state configuration for CG-based PUSCH transmission, then the communication reliability is improved, but the ease of operation decreases
Solution Approach 1:
The patent removes the requirement to consider HARQ state configuration from CG-based PUSCH transmission procedures. The UE simply transmits on CG resources without needing to check or apply HARQ-ACK transmission timing, PUCCH resource allocation, or other HARQ state-related parameters, thereby significantly improving ease of operation
Solution Approach 2:
The configured grant transmission mechanism operates autonomously without requiring HARQ state management. The UE can autonomously transmit on pre-configured CG resources based on simple triggering conditions (such as data availability or LBT success), without needing to coordinate with the network about HARQ states or wait for dynamic scheduling decisions
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for performing a physical uplink shared channel transmission based on a configured grant. One method includes receiving, at a user equipment, a HARQ state configuration for a set of HARQ processes over RRC signaling. The method includes receiving a CG for a PUSCH transmission. The method includes performing a PUSCH transmission based on the CG for a HARQ process associated with the CG without considering at least part of the HARQ state configuration for the HARQ process.