Configured Grant Timer Management in Wireless Communication Systems
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Solution Overview
Problem
In wireless communication systems, managing configured grant timers effectively is challenging, especially when dealing with invalid retransmission grants, which can lead to latency issues and inefficient resource utilization due to the prohibition of using configured grants associated with running timers.
Innovation Solution
A method where a user equipment (UE) in a wireless communication system manages a configured grant timer by restarting it only when the Hybrid Automatic Repeat Request (HARQ) buffer is not empty and stopping it when the buffer is empty, thereby ignoring invalid retransmission grants and allowing immediate reuse of configured grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the configured grant timer is restarted upon receiving any retransmission grant, then the reliability of HARQ process management is improved, but the latency increases and resource utilization deteriorates due to invalid retransmission grants being processed
Solution Approach 1:
The patent checks the HARQ buffer status before restarting the configured grant timer, performing a preliminary validation to determine whether the retransmission grant is valid. This preliminary action prevents unnecessary timer restarts for invalid grants, reducing latency while maintaining reliability for valid grants.
Solution Approach 2:
The HARQ buffer status acts as an intermediary condition that mediates between receiving a retransmission grant and restarting the configured grant timer. The buffer status check serves as a gatekeeping mechanism that allows timer restart only when justified by actual data transmission needs.
2Reliability
If the configured grant timer is restarted for every retransmission grant, then the HARQ process reliability is maintained, but the resource utilization efficiency deteriorates due to invalid grants occupying timer resources
Solution Approach 1:
The patent performs a preliminary check of the HARQ buffer status before restarting the configured grant timer. This preliminary validation ensures that only valid retransmission grants that correspond to actual data in the buffer will trigger a timer restart, preventing waste of timer resources on invalid grants while maintaining reliability for valid operations.
Solution Approach 2:
The patent changes the condition parameter for timer restart from a simple grant reception event to a compound condition involving both grant reception and non-empty buffer status. This parameter change filters out invalid grants and ensures timer resources are allocated only when necessary for actual data transmission.
3Reliability
If the configured grant timer is continuously running, then the system maintains readiness for retransmission, but the latency increases when invalid grants are received and processed
Solution Approach 1:
The patent checks the HARQ buffer status as a preliminary condition before restarting the timer in response to a retransmission grant. This preliminary check ensures the timer is restarted only when there is actual data to transmit, preventing unnecessary delays caused by processing invalid grants while maintaining timer continuity for valid transmission scenarios.
Data Source
AI summary
The present disclosure relates to a method of managing a configured grant timer related to a Hybrid automatic repeat request (HARQ) process associated with a configured grant by a user equipment (UE) in a wireless communication system. Especially, the method includes the steps of receiving a retransmission grant for the HARQ process with starting the configured grant timer related to the HARQ process; based on a HARQ buffer of the HARQ process not being empty, performing a transmission for the HARQ process based on the retransmission grant with restarting the configured grant timer related to the HARQ process; and based on the HARQ buffer of the HARQ process being empty, stopping the configured grant timer related to the HARQ process.