Configured Grant Uplink Control Information Retransmission Without Timer
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently managing configured grant (CG) uplink control information (UCI) and retransmissions when a CG retransmission timer is not configured, leading to inefficiencies in resource utilization and potential errors in HARQ processes.
Innovation Solution
A method and apparatus for generating and transmitting CG-UCI based on the determination that a CG retransmission timer is not configured, allowing for the transmission of CG-UCI on a physical uplink channel and enabling retransmissions on a CG resource, even if the timer is not set, by using hybrid automatic repeat request (HARQ) feedback and energy detection thresholds for channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a CG retransmission timer is not configured, then resource utilization is improved and LBT overhead is reduced, but reliability of HARQ processes deteriorates due to potential errors
Solution Approach 1:
The patent changes the operational parameters of CG retransmission by enabling transmissions without a configured timer. The base station transmits HARQ feedback and the UE performs retransmissions based on this feedback without being constrained by a traditional retransmission timer, thereby improving resource utilization while maintaining reliability through alternative control mechanisms
Solution Approach 2:
The patent implements a feedback mechanism where the base station transmits HARQ feedback to the UE, and the UE uses this feedback to determine when to perform retransmissions. This feedback-based approach replaces the timer-based mechanism, allowing reliable HARQ processes without requiring a configured CG retransmission timer
2Productivity
If CG-UCI is transmitted on physical uplink channel without CG retransmission timer, then communication efficiency is improved, but complexity of managing retransmissions increases
Solution Approach 1:
The patent makes the CG resource serve multiple functions: it is used for both initial uplink transmissions and for retransmissions. The same CG resource and associated procedures are universally applied for both transmission types, eliminating the need for separate timer management and simplifying the overall system while improving communication efficiency
3Adaptability or versatility
If retransmission on CG resource is enabled without timer configuration, then flexibility of channel access is improved, but energy detection threshold management becomes more complex
Solution Approach 1:
The patent performs preliminary configuration of energy detection thresholds and LBT parameters before the actual transmission occurs. The base station configures the UE with appropriate thresholds and parameters in advance, allowing flexible channel access without real-time timer management while keeping the complexity manageable through pre-planned parameter sets
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may generate configured grant uplink control information (CG-UCI) based at least in part on a determination that a configured grant (CG) retransmission timer is not configured. The UE may transmit the CG-UCI on a physical uplink channel to a base station. In some aspects, the UE may receive a configuration indicating that retransmission on a CG resource is enabled, in association with a determination that a CG retransmission timer is not configured. The UE may transmit a retransmission on the CG resource based at least in part on receiving a message that includes hybrid automatic repeat request feedback for one or more CG communications. Numerous other aspects are provided.