Multi-Slot UCI Multiplexing with Uplink Preemption Recovery
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling multi-slot uplink control information (UCI) multiplexing, particularly when such transmissions overlap with higher priority or time-sensitive uplink communications, leading to incomplete data decoding and impaired HARQ retransmissions.
Innovation Solution
A user equipment (UE) receives an uplink cancellation indication to refrain from transmitting portions of a multi-slot PUSCH during conflicting time-domain resources, and identifies subsequent resources for resuming the transmission based on priority, allowing for selective retransmission of UCI components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits multi-slot PUSCH with multiplexed UCI in scheduled time-domain resources, then the uplink control information can be delivered to the base station, but the transmission may overlap with higher priority or time-sensitive uplink communications causing incomplete data decoding
Solution Approach 1:
The base station sends an uplink cancellation indication before the UE transmits the PUSCH in the conflicting time-domain resources. This preliminary action allows the UE to cancel the transmission in advance, preventing overlap with higher priority communications and ensuring complete decoding of the remaining transmission data.
Solution Approach 2:
The UE dynamically adjusts its transmission behavior based on the received cancellation indication. When a conflict is detected, the UE transitions from transmitting in the original time-domain resources to transmitting only in the remaining non-cancelled resources, adapting the transmission plan in real-time to maintain decoding completeness.
2Reliability
If the UE refrains from transmitting during cancelled time-domain resources, then complete decoding can be achieved, but the transmission time is extended to subsequent slots reducing overall throughput
Solution Approach 1:
Instead of cancelling the entire multi-slot PUSCH transmission, the UE selectively transmits only in the non-cancelled time-domain resources. This partial action approach maintains decoding completeness for the transmitted portion while minimizing transmission delay by utilizing available resources rather than waiting for a completely new transmission opportunity.
Solution Approach 2:
The UE discards the transmission in the cancelled time-domain resources but recovers by transmitting the same or remaining data in subsequent non-cancelled resources. This allows the system to recover from the cancellation while minimizing overall transmission delay and maintaining decoding completeness.
3Productivity
If the UE transmits PUSCH in overlapping resources with higher priority communications, then resource utilization is maximized, but the higher priority communications may be impaired
Solution Approach 1:
The base station sends a cancellation indication to preemptively prevent the UE from transmitting in time-domain resources that would overlap with higher priority communications. This preliminary anti-action eliminates the potential interference before it occurs, ensuring the quality of higher priority communications is maintained while still allowing transmission in non-conflicting resources.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an uplink cancellation indication that identifies one or more first time-domain resources during which the UE is to refrain from transmitting at least a portion of a physical uplink shared channel (PUSCH) transmission scheduled to be transmitted during the one or more first time-domain resources. The UE may identify one or more second time-domain resources during which the UE is to transmit the at least the portion of the PUSCH transmission or another portion of the PUSCH transmission. The UE may transmit, based at least in part on receiving the uplink cancellation indication, the at least the portion of the PUSCH transmission or the other portion of the PUSCH transmission during the one or more second time-domain resources. Numerous other aspects are provided.