Interlaced UL Cancellation Indication for NR-U Resource Blocks
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Solution Overview
Problem
Interlaced frequency resource allocation in 5G/NR Unlicensed Spectrum (NR-U) has not been adequately addressed in existing uplink cancellation indications, leading to inefficiencies in indicating resource blocks for cancellation across multiple UEs.
Innovation Solution
A method for wireless communication that determines a set of interlaced UL resources for cancellation based on a UL cancellation indication, using resource indication values to identify interlaces and Physical Resource Blocks within each interlace for cancellation, and cancels UL transmissions accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional UL cancellation indication methods are used with interlaced resource allocation, then the indication can be applied to multiple UEs, but the efficiency of indicating resources for cancellation deteriorates due to misalignment with interlaced structure
Solution Approach 1:
The patent segments the frequency resources into interlaces (odd and even interlaces) and applies separate cancellation indication bits for each interlace. This segmentation allows the cancellation indication to precisely target specific interlaces used by individual UEs, improving both the efficiency and accuracy of resource cancellation indication compared to traditional methods that treat all resources uniformly.
2Reliability
If interlaced frequency resource allocation is implemented for NR-U, then frequency diversity is improved, but the complexity of UL cancellation indication increases due to need to identify specific interlaces and PRBs
Solution Approach 1:
The patent extracts the interlace identification information from the traditional continuous PRB indication structure and creates a separate interlace indication field. This extraction simplifies the overall indication structure by separating the interlace selection (using RIV encoding for compactness) from the PRB indication within each interlace, making the system more manageable despite the increased granularity required for interlaced allocation.
Solution Approach 2:
The patent introduces a new dimension to the resource indication by adding interlace-level identification alongside PRB-level indication. Instead of only indicating contiguous PRBs in a single frequency dimension, the system now operates in two dimensions: interlace selection (which frequency subsets) and PRB selection within each interlace. This dimensional expansion enables precise targeting of interlaced resources while maintaining structured indication.
3Ease of operation
If UL cancellation indication uses contiguous RB specification, then the indication format remains simple, but it cannot effectively target interlaced resources allocated to individual UEs
Solution Approach 1:
The patent applies local quality by allowing different indication formats for different resource types. Instead of using a single uniform indication format for all UEs, the system uses interlace-specific indication bits that are tailored to the interlaced resource allocation pattern. Each UE receives cancellation indications customized to its specific interlace configuration, improving precision while maintaining operational simplicity through standardized RIV encoding rules.
Data Source
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AI summary
A method for wireless communication includes: requesting transmission, by a wireless device, of uplink (UL) transmissions to a wireless station; receiving, by the wireless device, a UL cancellation indication (CI) to be applied to a determined reference region; determining, by the wireless device, a set of UL resources for cancellation based on the UL CI received from the wireless station (e.g., by determining an indication of particular interlaces and/or particular Physical Resource Blocks within such interlaces that are to be canceled), wherein at least a subset of the UL resources for cancellation are interlaced; and canceling, by the wireless device, UL transmissions over at least the determined set of UL resources for cancellation (i.e., additional UL transmissions may be cancelled, too). The wireless device may then perform UL transmissions that do not overlap with the determined set of UL resources for cancellation in any UL CI to the wireless station.