Uplink Cancellation Indication for Priority Resource Reallocation
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Solution Overview
Problem
In wireless communication systems, there is a challenge in efficiently managing uplink transmissions when higher priority traffic needs to be scheduled on the same resources allocated to lower priority traffic, especially in scenarios where strict latency requirements cannot be met by delaying the original transmission.
Innovation Solution
The use of an uplink cancelation indication (UL CI) is implemented to instruct a UE to cancel its scheduled transmission, allowing resources to be reallocated for higher priority traffic, with the UL CI specifying interlace and/or resource block (RB) set parameters in the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a UE is scheduled for uplink transmission on allocated resources, then the transmission can proceed normally, but when higher priority traffic needs to be scheduled on the same resources, the resources cannot be reallocated without delaying the original transmission
Solution Approach 1:
The base station sends an uplink cancelation indication to the UE before the scheduled uplink transmission occurs. This preliminary action informs the UE to cancel its transmission on the originally allocated resources, allowing the base station to reallocate those resources for higher priority traffic without causing transmission delay to the original UE
2Productivity
If resources are allocated to multiple UEs, then resource utilization is efficient, but managing priority-based scheduling on the same resources becomes complex
Solution Approach 1:
The base station implements a feedback mechanism by sending uplink cancelation indications to UEs when higher priority traffic needs to use previously allocated resources. This feedback loop allows dynamic priority-based scheduling management, enabling the base station to efficiently reallocate resources based on changing traffic priorities while maintaining clear control over the scheduling process
Data Source
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AI summary
A base station (BS) may cancel an uplink transmission that was previously scheduled for a user equipment (UE). For example, after scheduling a first UE for an uplink transmission on a particular resource, a BS may elect to schedule a second UE with higher priority traffic on at least a portion of that same resource. In this case, the BS may send an uplink cancelation indication (UL CI) to instruct the first UE to cancel its transmission. In some examples, for uplink transmissions on unlicensed radio frequency spectrum where an interlace structure and resource block (RB) sets are used for frequency-domain resource allocation, an UL CI may indicate interlace and/or RB set parameters for the frequency domain.