UE Resource Cancellation via DCI Format 2_4
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Solution Overview
Problem
In wireless communication systems, uplink transmission collisions occur due to overlapping resource scheduling, leading to the need for efficient resource cancellation methods to prevent throughput loss.
Innovation Solution
A resource cancellation method for user equipment (UE) that receives and processes downlink control information (DCI) to cancel uplink transmissions, utilizing specific time and frequency resource configurations to avoid collisions, including cell-specific, TRP/panel-specific, and beam-specific indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the base station schedules uplink transmissions for multiple UEs using DCI, then resource utilization is improved, but transmission collisions occur between different UEs
Solution Approach 1:
The base station sends a cancellation indication DCI before the scheduled uplink transmission time to proactively cancel potentially colliding transmissions. This preliminary action prevents collisions before they occur by notifying UEs in advance to cancel their planned transmissions on overlapping resources.
Solution Approach 2:
The cancellation indication mechanism provides feedback from the base station to UEs about resource allocation conflicts. When the base station detects or anticipates a collision, it sends feedback via DCI format 2_4 to inform affected UEs to cancel their transmissions, enabling dynamic adjustment based on current resource usage state.
2Reliability
If a UL cancellation indication DCI is introduced to cancel overlapping transmissions, then transmission collisions are prevented, but system complexity increases
Solution Approach 1:
The cancellation indication uses the existing DCI framework with a new format (DCI format 2_4), leveraging the established downlink control information infrastructure. This universal approach reuses existing signaling mechanisms rather than creating entirely new protocols, thereby reducing the complexity increase.
Solution Approach 2:
The patent introduces specific parameters in the DCI message including cancellation indication bitmap, serving cell index, and time/frequency resource indicators. By changing and adding specific parameters to the existing DCI structure rather than creating new message types, the implementation maintains compatibility with existing systems while adding necessary functionality.
3Measurement precision
If resource cancellation is implemented with detailed time and frequency resource configuration, then collision prevention accuracy is improved, but signaling overhead increases
Solution Approach 1:
The cancellation indication bitmap is segmented into individual bits, where each bit corresponds to a specific time-frequency resource unit. This segmentation allows precise indication of which specific resources should be cancelled without transmitting detailed configuration information for each resource, reducing signaling overhead while maintaining accuracy.
Solution Approach 2:
The patent uses a bitmap representation that copies the structure of the resource grid, with each bit position corresponding to a specific resource element. This copying approach efficiently represents resource allocation status without transmitting redundant configuration information, achieving precise collision prevention with minimal overhead.
Data Source
AI summary
A resource cancellation method and user equipment (UE) are provided. In the method, a resource configuration is received; the first DCI associated with the resource configuration is received; and a first uplink (UL) transmission on the serving cell is cancelled according to the first downlink control information (DCI). The resource configuration indicates a position of first information for a serving cell in a first DCI, and the first information is associated with a first set of time and frequency resource in the serving cell.