Two-Stage Grant PUSCH Transmission Expiration Handling
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Solution Overview
Problem
Current systems for handling two-stage grant validity duration in physical uplink shared channel (PUSCH) transmissions in wireless communications face challenges in managing the expiration of validity timers and failure to receive trigger signals, leading to inefficiencies and potential data loss.
Innovation Solution
Implementing a method where the MAC entity considers a PUSCH transmission as completed even if the trigger is not received or the validity timer expires, initiating discontinuous reception timers and monitoring for the trigger until the timer expires, and treating the expiration as a Hybrid Automatic Repeat Request (HARQ) retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MAC entity waits for the PUSCH trigger to be received before considering transmission completed, then transmission reliability can be verified, but the validity timer may expire causing retransmission delays and potential data loss
Solution Approach 1:
The MAC entity performs preliminary action by considering the PUSCH transmission completed before actually receiving the trigger signal. The validity timer is started in advance and the transmission is deemed completed when the timer expires, rather than waiting for the trigger to be received. This preliminary determination of transmission completion resolves the contradiction by eliminating the waiting period that would cause time loss.
2Productivity
If the MAC entity considers transmission completed upon timer expiration, then retransmission delays are avoided, but the trigger signal may not be received causing potential data loss
Solution Approach 1:
The patent converts the potentially harmful effect of not receiving the trigger signal into a beneficial outcome. Instead of treating the missing trigger as an error condition requiring retransmission, the system uses the timer expiration as a mechanism to automatically consider the transmission completed. This transforms the absence of the trigger signal from a harmful factor into a valid completion condition, improving productivity while maintaining data integrity.
3Adaptability or versatility
If the system implements two-stage grant operation with validity timer, then transmission control flexibility is improved, but complexity in managing timer expiration and trigger reception increases
Solution Approach 1:
The patent extracts the complex trigger reception verification step from the transmission completion process. By separating the timer expiration condition from the trigger reception requirement, the system simplifies the completion criteria to simply waiting for timer expiration. This extraction reduces the complexity of managing both timer and trigger simultaneously while maintaining the flexibility of two-stage grant operation.
Data Source
AI summary
Embodiments of the present disclosure may include monitoring, at a physical layer, for a physical uplink shared channel (PUSCH) trigger for a PUSCH transmission, determining, at the physical layer, the PUSCH trigger is not received, wherein a wireless communication device is not to perform the PUSCH transmission based on the determination that the PUSCH trigger is not received, and considering, at a medium access control (MAC) entity, the PUSCH transmission to have been performed. Other embodiments may be described and/or claimed.