Uplink Cancelation Indication for Interlace-Based Resource Preemption
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink transmissions, particularly in unlicensed bands, where higher priority traffic may need to preempt scheduled resources, necessitating effective cancellation mechanisms.
Innovation Solution
Implementing uplink cancelation indications (UL CI) that specify interlace and resource block (RB) sets in the frequency domain to cancel scheduled uplink transmissions when higher priority traffic is scheduled, using interlace and RB parameters for frequency-domain resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink cancelation indication is implemented to allow higher priority traffic to preempt scheduled resources, then network resource utilization and responsiveness are improved, but system complexity and signaling overhead increase
Solution Approach 1:
The frequency domain resources are segmented into multiple interlaces, where each interlace consists of non-contiguous resource blocks. This segmentation allows the cancelation indication to target specific interlaces or RB sets within interlaces, enabling granular control of preemption without requiring system-wide reconfiguration, thus managing complexity while improving resource utilization.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by organizing frequency resources into interlaces with specific spacing patterns. This dimensional organization allows the cancelation indication to efficiently identify and cancel specific portions of uplink transmissions by referencing interlace indices and RB set configurations, reducing signaling overhead compared to listing individual resource blocks.
2Manufacturing precision
If interlace and RB set parameters are used for frequency-domain resource allocation in cancelation indications, then resource allocation precision is improved, but information processing requirements and signaling overhead increase
Solution Approach 1:
The interlace and RB set parameters serve multiple functions: they define the frequency domain structure for resource allocation, enable precise identification of cancelable resources, and provide a compact representation for cancelation indications. This multi-functionality allows the same parameter set to support both resource allocation and cancelation signaling, reducing overall signaling overhead while maintaining precision.
Solution Approach 2:
The interlace configurations and RB set parameters are predetermined and configured before actual resource allocation occurs. By pre-establishing these structural parameters, the system eliminates the need to transmit detailed resource allocation information for each scheduling decision, reducing signaling overhead while maintaining allocation precision through reference to pre-configured parameter sets.
Data Source
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