Configured Grant Timer Synchronization in 5G NR Uplink
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Solution Overview
Problem
The 5G NR system faces challenges in handling conflicts between PUSCH durations indicated by Dynamic Uplink Grants (DGs) and Configured Uplink Grants (CGs), leading to unsynchronized configured grant timer behavior between the UE and the network, which affects data transmission prioritization and retransmissions.
Innovation Solution
The proposed solution involves a method where the UE determines whether a first HARQ process of a first PUSCH duration is occupied by a dynamic uplink grant, and if so, prioritizes the PUSCH duration based on set rules. The UE then starts or restarts the configured grant timer during the prioritized PUSCH duration, ensuring synchronization with the network by starting all conflicting timers, regardless of which duration is selected for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE starts or restarts the configured grant timer during the first PUSCH duration when prioritized over the dynamic uplink grant, then timer synchronization between UE and network is improved, but the complexity of timer management increases
Solution Approach 1:
The configured grant timer is made dynamic by allowing it to be started or restarted during the PUSCH duration when the configured uplink grant is prioritized over the dynamic uplink grant. This dynamic timer adjustment ensures synchronization between UE and network while adapting to the prioritization outcome, resolving the contradiction between reliability and complexity.
2Reliability
If the UE prioritizes the first PUSCH duration over the second PUSCH duration based on set rules, then data transmission reliability is improved, but the processing complexity increases
Solution Approach 1:
The UE performs preliminary prioritization processing by determining whether the first PUSCH duration is prioritized over the second PUSCH duration based on predefined set rules before actual transmission. This advance decision-making simplifies subsequent timer management and ensures reliable data transmission by resolving conflicts beforehand.
3Productivity
If the UE performs transmission on the first PUSCH duration when prioritized, then data transmission efficiency is improved, but the risk of timer desynchronization with network increases
Solution Approach 1:
The UE implements feedback mechanism by monitoring the prioritization outcome and providing feedback to the timer management function. When the first PUSCH duration is prioritized, the UE feeds this information back to start or restart the configured grant timer, ensuring synchronization is maintained despite efficient prioritized transmission.
Data Source
AI summary
A method performed by a UE for wireless communications is provided. The method includes determining whether a first HARQ process of a first PUSCH duration of a first configured uplink grant is occupied by a dynamic uplink grant indicating a second PUSCH duration, and in a case that the first HARQ process of the first PUSCH duration is occupied by the dynamic uplink grant indicating the second PUSCH duration, determining whether the first PUSCH duration is prioritized over the second PUSCH duration based on a set of rules for determining priorities for the first PUSCH duration and the second PUSCH duration, and when the first PUSCH duration is prioritized over the second PUSCH duration, performing transmission on the first PUSCH duration, and starting or restarting a first configured grant timer corresponding to the first HARQ process of the first PUSCH duration during the first PUSCH duration.