Multi-PUSCH Configured Grant HARQ PID Remapping for Unused Transmission Occasions
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Solution Overview
Problem
In wireless communications, especially during 5G NR communications, efficient scheduling of uplink communications is challenging, particularly for providing Extended Reality services, due to the need to identify unused transmission occasions in multi-PUSCH Configured Grants.
Innovation Solution
The proposed solution involves determining HARQ PIDs for transmission occasions in a multi-PUSCH Configured Grant cycle, evaluating the status of associated CG timers, and identifying unused or invalid transmission occasions. This information is used to transmit UTO-UCI to the base station, allowing the UE to perform UL communications without using blocked resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE determines HARQ PIDs and identifies unused transmission occasions in multi-PUSCH Configured Grants, then the efficiency of uplink communication scheduling is improved, but the complexity of the scheduling process increases
Solution Approach 1:
The UE determines HARQ PIDs for all transmission occasions in advance before actual transmission occurs. This preliminary determination allows the UE to identify unused transmission occasions (UTOs) proactively, enabling more efficient scheduling decisions while managing complexity through structured advance planning
Solution Approach 2:
The multi-PUSCH Configured Grant cycle is divided into multiple transmission occasions, each with its own HARQ PID. This segmentation allows the UE to evaluate and identify UTOs on an individual occasion basis, improving scheduling efficiency by targeting specific unused resources without overwhelming complexity
2Reliability
If the UE identifies and avoids blocked resources by evaluating CG timer status, then the reliability of uplink transmission is improved, but the time required for resource evaluation increases
Solution Approach 1:
The UE evaluates the status of CG timers associated with each HARQ PID before determining which transmission occasions are blocked. This preliminary evaluation of timer status ensures reliable identification of usable resources while completing the assessment in advance to minimize time loss during actual transmission
Solution Approach 2:
The system uses the existing CG timer mechanism to automatically indicate blocked resources. The timer status itself serves as the evaluation criterion, eliminating the need for separate complex evaluation processes and reducing time overhead while maintaining reliability
3Productivity
If the UE transmits UTO-UCI to indicate unused transmission occasions, then the utilization of radio resources is improved, but the overhead of control signaling increases
Solution Approach 1:
The UE extracts and transmits only the essential information about unused transmission occasions through UTO-UCI, separating this specific control information from general uplink data transmission. This targeted approach improves radio resource utilization by clearly indicating available resources while minimizing overhead by transmitting only necessary UTO information
Data Source
AI summary
Transmission occasions in a multi-PUSCH CG cycle can be identified as unused transmission occasions (UTOs) or used transmission occasions. HARQ PIDs for transmission occasions of the multi-PUSCH CG cycle can be determined prior to processing the first PUSCH. UTOs among all transmission occasions of the multi-PUSCH CG cycle can be determined based on a CG timer associated with the HARQ PIDs, status of a logical channel buffer associated with the multi-PUSCH CG, and prioritization of additional grants. HARQ PIDs can be remapped or changed to no longer be blocked by the CG timer. Overlapping transmission occasions of other grants may or may not be prioritized based on whether they overlap with multi-PUSCH CG transmission occasions already identified as UTOs. The use status of the transmission occasions can be reevaluated when certain conditions are met. Base stations can automatically refrain from decoding multi-PUSCH CG transmission occasions blocked by a CG timer.