Uplink Time-Frequency Cancellation for Mixed-Capability UEs
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Solution Overview
Problem
Existing wireless communication systems face challenges in indicating and adjusting reference uplink resources (RUR) and cancelled uplink resources across UEs with different processing capabilities, particularly in scenarios requiring ultra-low latency and high reliability, such as URLLC services.
Innovation Solution
The system employs various methods to indicate RURs, including explicit bit distinction, CRC scrambling, and different search spaces, to accommodate UEs with varying processing capabilities, ensuring flexible resource allocation and efficient cancellation of uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single reference uplink resource allocation method is used for all UEs, then the system is simple to implement, but it cannot accommodate UEs with different processing capabilities
Solution Approach 1:
The patent applies dynamics by making the reference uplink resource allocation method adaptive rather than static. The network can dynamically select between first and second allocation methods based on UE processing capabilities, and the second allocation method allows dynamic determination of cancelled resources within the reference resource. This enables the system to adapt to different UE capabilities while maintaining implementation feasibility through standardized procedures.
Solution Approach 2:
The patent changes the parameter of resource allocation granularity. The first allocation method uses coarse-grained allocation (entire reference uplink resource), while the second method enables fine-grained cancellation of specific time-frequency resources within the reference resource. This parameter change allows the system to balance between simplicity and adaptability by selecting appropriate allocation granularity based on UE capabilities.
2Productivity
If uplink cancellation indication is provided with fine-grained resource control, then resource utilization is optimized, but the processing complexity and latency increase
Solution Approach 1:
The patent segments the reference uplink resource into multiple time-frequency resources, enabling selective cancellation of specific segments rather than the entire resource. This segmentation allows fine-grained resource control where only the necessary portions are cancelled, optimizing resource utilization while reducing the processing burden compared to handling entire resource blocks.
Solution Approach 2:
The patent applies partial action by cancelling only the specific time-frequency resources that need to be released for URLLC traffic, rather than cancelling the entire reference uplink resource. This partial cancellation approach optimizes resource utilization by keeping non-conflicting resources available, while the processing time is reduced compared to managing complete resource cancellations.
3Adaptability or versatility
If the cancelled resources start after a fixed period from DCI reception, then the timing is simple to manage, but it does not provide flexibility for different processing capabilities
Solution Approach 1:
The patent applies preliminary action by providing the cancellation indication in advance through DCI, allowing the UE to prepare for resource cancellation before the actual cancellation takes effect. The network can indicate which specific time-frequency resources within the reference resource should be cancelled, giving the UE sufficient processing time while maintaining flexibility for different capability levels through standardized indication procedures.
Data Source
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AI summary
Apparatuses, methods, systems, and computer readable media are disclosed. In one aspect, a wireless communications method is disclosed. The method includes receiving, at a wireless terminal from a network node, an uplink cancellation indication. The method further includes determining, at the wireless terminal, an allocation of a reference uplink resources comprising a plurality of uplink time-frequency resources; and determining, by the wireless terminal, one or more of the plurality of uplink time-frequency resources to cancel according to the uplink cancellation indication. The method further includes cancelling, by the wireless terminal based on the uplink cancellation indication, an uplink transmission on the determined one or more of the plurality of uplink time-frequency resources.