Spatial Uplink Cancellation for Priority Resource Conflicts
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Solution Overview
Problem
Existing wireless communication systems, particularly in NR and LTE, face challenges in efficiently managing uplink resources due to conflicts between different priority services like eMBB and URLLC, leading to suboptimal spectrum utilization and decoding performance.
Innovation Solution
Implementing an uplink cancellation indication (ULCI) that distinguishes between uplink transmission groups with different spatial parameters, allowing preemptive resource adjustments based on priority, such as URLLC over eMBB, to improve decoding performance and spectrum utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink resources are shared between different priority services (eMBB and URLLC), then spectrum utilization is improved, but decoding performance deteriorates due to resource conflicts
Solution Approach 1:
The patent segments uplink transmissions into different groups based on spatial parameters (beam directions). By dividing the uplink transmission space into multiple groups, the system can apply different cancellation indications to different spatial segments, allowing URLLC to preempt eMBB in specific spatial directions without affecting other spatial segments. This segmentation resolves the contradiction by enabling selective resource management that improves spectrum utilization while maintaining decoding performance through spatial isolation.
Solution Approach 2:
The patent applies local quality by making the cancellation indication spatially selective. Instead of applying cancellation uniformly across all uplink transmissions, the system applies cancellation only to specific spatial directions or beams where URLLC transmissions occur. This allows the system to maintain high spectrum utilization by allowing eMBB to continue in non-conflicting spatial regions while ensuring reliable URLLC transmission in priority regions, thus resolving the contradiction between spectrum utilization and decoding performance.
2Device complexity
If uplink cancellation indication is applied without spatial differentiation, then implementation complexity is reduced, but resource management precision deteriorates
Solution Approach 1:
The patent introduces a spatial dimension to the cancellation indication mechanism. By adding spatial parameters (beam directions, spatial filters) to the traditional time-frequency resource indication, the system achieves precise resource management without excessive complexity. The spatial dimension allows the network to identify and cancel only the specific uplink transmissions that conflict with URLLC, rather than applying blanket cancellations. This dimensional extension resolves the contradiction by providing precise resource management capability while maintaining relatively simple implementation through the use of spatial filter coefficients.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for receiving an uplink cancelation indication (ULCI) with a number of bits that indicate resources on which one or more uplink channels are to be modified; determining, from at least two uplink transmission groups characterized by different spatial parameters, at least one uplink transmission group to which a received ULCI applies in a component charrier; and modifying the one or more uplink channels that belong to the determined uplink transmission group in accordance with the ULCI. For example, modifying the one or more uplink channels includes at least partially canceling the one or more uplink channels if the resources indicated in the ULCI overlap with the resources of the one or more uplink channels. The one or more uplink channels may include at least one of: one or more physical uplink shared channels (PUSCHs) or one or more PUSCH repetitions.