Interlaced UL Cancellation Indication for 5G NR-U Resource Management
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in indicating uplink transmission cancellations across multiple user equipment (UEs) when using interlaced frequency resource allocation schemes, particularly in 5G/NR-U, leading to suboptimal resource management and potential interference.
Innovation Solution
The method involves scheduling uplink transmissions, determining the need for higher priority transmissions, and sending downlink control channel indications to cancel specific interlaced resource blocks, allowing for efficient cancellation of overlapping resources, thereby optimizing resource allocation and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional contiguous resource block indication is used for UL cancellation, then the indication method is simple and compatible with existing systems, but it is inefficient for interlaced frequency resource allocation schemes
Solution Approach 1:
The frequency resources are segmented into multiple interlaces, where each interlace consists of non-contiguous resource blocks. The cancellation indication is then segmented to indicate specific interlaces rather than contiguous resource blocks, making the indication method adapted to interlaced resource allocation while maintaining manageable complexity through structured segmentation.
Solution Approach 2:
The indication method changes from indicating contiguous resource block ranges to indicating interlace indices and offsets. This parameter transformation allows the same indication mechanism to efficiently represent non-contiguous resources by changing what parameters are being indicated (from continuous RB indices to discrete interlace identifiers), resolving the incompatibility without requiring a completely new indication framework.
2Productivity
If UL cancellation indication is applied without considering interlaced resource allocation, then the existing cancellation mechanism can be used, but resource management efficiency deteriorates
Solution Approach 1:
The system pre-defines interlace structures and allocates UEs to specific interlaces before UL cancellation is needed. This preliminary organization of resources into interlaces allows the cancellation indication to directly target specific interlaces, improving both the efficiency of resource management and the accuracy of cancellation by matching the indication granularity with the actual resource allocation structure.
Solution Approach 2:
The cancellation indication mechanism provides feedback to UEs about which interlaces should be cancelled, allowing UEs to adjust their transmissions accordingly. This feedback loop ensures that cancellation indications are accurately interpreted and executed, improving both resource management efficiency and reliability by ensuring that only the intended resources are cancelled.
3Quantity of substance
If interlaced frequency resource allocation is used, then spectrum utilization is improved, but the existing UL cancellation indication becomes suboptimal
Solution Approach 1:
The cancellation indication mechanism is designed to be universal, working with both traditional contiguous resource allocation and interlaced resource allocation. By indicating interlaces rather than specific resource blocks, the same indication mechanism can handle both allocation types, maintaining simplicity while supporting improved spectrum utilization through interlaced allocation.
Solution Approach 2:
The indication approach transitions from a one-dimensional contiguous resource block indication to a two-dimensional indication system that specifies both interlace index and offset within interlace. This dimensional transformation allows the system to efficiently indicate non-contiguous resources while maintaining operational simplicity through a structured indication format that UEs can easily interpret.
Data Source
AI summary
A method for wireless communication includes: scheduling, by a wireless station, a first uplink (UL) transmission from a wireless device; determining, by the wireless station, a need for a higher priority uplink transmission that uses resources overlapping with the first UL transmission; determining, by the wireless station, a reference region, within which a UL cancellation indication (CI) is to be applied; determining, by the wireless station, a set of UL resources in the reference region for cancellation, wherein at least a subset of the UL resources in the reference region are interlaced; sending, via a downlink control channel, indication of the determined set of UL resources for cancellation (e.g., by indicating particular interlaces and/or particular Physical Resource Blocks within such interlaces that are to be canceled); and receiving, at the wireless station, the higher priority uplink transmission via at least a subset of the determined set of cancelled UL resources.