DLPI and ULCI Signaling Across Non-Contiguous Subbands
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Solution Overview
Problem
Current signaling mechanisms in wireless communications systems do not support preemption or cancellation of transmissions that span multiple non-contiguous subbands, which are common in virtual cells formed by fractional spectrum integration.
Innovation Solution
Enhanced downlink preemption indication (DLPI) and uplink cancelation indication (ULCI) signaling that indicates preemption or cancellation of transmissions across multiple non-contiguous subbands, using bitmaps to specify affected time-frequency resources and scrambling sequences based on UE identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current signaling mechanisms are used for preemption indication, then signaling simplicity is maintained, but support for multiple non-contiguous subbands is lost
Solution Approach 1:
The bandwidth is divided into multiple subbands, each represented by a separate bitmap in the preemption indication message. This segmentation allows the system to indicate preemption status for each non-contiguous subband independently, enabling support for fractional spectrum integration while maintaining manageable signaling through structured bitmaps.
Solution Approach 2:
The preemption indication mechanism is extended from a single-band approach to a multi-dimensional approach by incorporating subband identifiers and multiple bitmaps. This dimensional extension allows the same signaling structure to handle both contiguous and non-contiguous subbands across different frequency ranges.
2Adaptability or versatility
If preemption indication for non-contiguous subbands is implemented, then resource management flexibility is improved, but message size increases
Solution Approach 1:
The resource management information is segmented into subband-specific bitmaps, where each bitmap only covers the resources within its designated subband. This segmentation allows flexible resource management across non-contiguous subbands while keeping each individual bitmap compact, thus controlling overall message size.
Solution Approach 2:
The preemption indication message includes only the necessary bitmaps for subbands that actually require preemption indication. By using partial action (including only needed subband information rather than all possible subbands), the message size is optimized while maintaining the flexibility to indicate preemption in any combination of subbands.
3Productivity
If virtual cells with non-contiguous subbands are used, then spectrum utilization is improved, but monitoring complexity increases
Solution Approach 1:
Multiple non-contiguous subbands are merged into a single virtual cell entity, allowing the UE to monitor and receive preemption indications for all subbands through a unified mechanism. The network entity manages the virtual cell as a single logical unit, combining resource allocation and preemption indication across all non-contiguous subbands, thereby improving spectrum utilization while controlling monitoring complexity through virtualization.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a control message indicating scheduling information for a downlink message or an uplink message that is scheduled for transmission via a first subband of a first radio frequency spectrum band and via a second subband of a second radio frequency spectrum band. The second subband may be non-contiguous with the first subband, and the first and second subbands may be associated with a virtual cell that supports communications for the UE. The UE may receive a preemption message or a cancellation message indicating that at least a portion of the downlink message or the uplink message is preempted or canceled, and the portion may correspond to the first subband and the second subband. The preemption message or the cancellation message may indicate time-frequency resources that are preempted or canceled.