Uplink Pre-Emption Signaling for PUSCH Resource Conflicts
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Solution Overview
Problem
Future wireless communications networks face challenges in efficiently managing communications resources to accommodate diverse devices with varying data traffic profiles, particularly when high-priority transmissions like URLLC pre-empt lower-priority transmissions such as eMBB, leading to interference and decoding issues.
Innovation Solution
Implementing an uplink pre-emption indicator system that adjusts communications parameters in response to resource allocation, using a reference region-based bitmap to manage both configured and dynamic grant PUSCH transmissions, ensuring efficient resource use and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink communications resources are allocated for high-priority transmissions (URLLC), then transmission reliability for critical data is improved, but interference occurs with lower-priority transmissions (eMBB) sharing the same resources
Solution Approach 1:
The uplink communications resources are segmented into different types (configured grant PUSCH and dynamic grant PUSCH), and the pre-emption indicator is specifically designed to address only the configured grant portion. This segmentation allows the system to apply different handling mechanisms to different resource types, resolving the interference issue while preserving reliability for urgent transmissions.
Solution Approach 2:
An uplink pre-emption indicator is introduced as an intermediary signal transmitted on the downlink to inform UEs about pre-emption of their uplink resources. This intermediary mechanism enables coordinated resource management between high-priority and lower-priority transmissions, allowing the system to resolve interference without sacrificing transmission reliability.
2Productivity
If a reference region-based bitmap system is implemented to manage pre-emption indicators, then resource utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The reference region is segmented into multiple resource blocks, and the bitmap efficiently represents pre-emption status across these segments. This segmentation approach allows compact representation of resource allocation information, improving efficiency while keeping the indicator structure manageable and not excessively complex.
Solution Approach 2:
The system uses parameter changes in the bitmap representation to efficiently convey pre-emption information. By varying the bitmap values to indicate different pre-emption scenarios, the system achieves high resource utilization efficiency without requiring complex signaling mechanisms.
3Speed
If configured grant PUSCH resources are pre-empted by dynamic grant PUSCH transmissions, then low-latency communication is improved, but decoding reliability for pre-empted transmissions deteriorates
Solution Approach 1:
The downlink pre-emption indicator is transmitted in advance on the downlink before the uplink transmission occurs. This preliminary action allows the receiving UE to be notified of potential pre-emption beforehand, enabling it to adjust its decoding strategy or request retransmission, thereby maintaining decoding reliability even when low-latency pre-emption occurs.
Solution Approach 2:
The system implements a feedback mechanism where the receiving UE uses the pre-emption indicator information to adjust its reception and decoding behavior. This feedback loop ensures that decoding reliability is maintained despite resource pre-emption, as the receiver can compensate for the pre-emption effects based on the indicator information.
Data Source
AI summary
A method of operating a communications device for transmitting data to or receiving data from an infrastructure equipment forming part of a wireless communications network. The method comprises determining uplink communications resources of a wireless access interface provided by the wireless communications network to be used for the transmission of data by the communications device to the infrastructure equipment, receiving, from the infrastructure equipment via the wireless radio interface, an uplink pre-emption indicator that indicates that at least a portion of the uplink communications resources are allocated for the transmission of signals by another communications device, the at least the portion of the uplink communications resources being located within communications resources of a reference region associated with the uplink pre-emption indicator, and adjusting one or more communications parameters for the transmission of signals representing the data in the uplink communications resources in response to receiving the uplink pre-emption indicator.