Configurable Cancellation Indicator for 5G NR Transmission Preemption
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in efficiently cancelling scheduled transmissions across both downlink and uplink directions, as existing mechanisms lack the flexibility to preempt semi-persistent scheduling (SPS) configured downlink transmissions and fail to cancel a broader range of signals effectively.
Innovation Solution
A method and apparatus that utilize a configurable cancellation indicator (CI) to cancel scheduled transmissions, allowing for the indication of cancellation in either the downlink, uplink, or both directions, enabling the cancellation of specific types of transmissions on designated resources, including the ability to cancel entire or partial transmissions based on the indicator format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing cancellation mechanisms are used, then the system can cancel scheduled transmissions, but the flexibility to preempt semi-persistent scheduling configured downlink transmissions and cancel a broader range of signals is insufficient
Solution Approach 1:
The cancellation indicator format is made dynamic and configurable rather than fixed. The network can configure different formats (first format for uplink, second format for downlink) based on operational needs, allowing the system to adapt its cancellation capability to different scenarios while maintaining manageable complexity through configuration rather than hardcoding multiple formats
Solution Approach 2:
A single cancellation indicator mechanism is designed to serve multiple functions: it can cancel uplink transmissions, cancel downlink transmissions, and preempt semi-persistent scheduling configured downlink transmissions. The configurable format allows the same basic mechanism to be universally applied across different transmission types and directions
2Adaptability or versatility
If a configurable cancellation indicator format is implemented, then the ability to cancel transmissions in both downlink and uplink directions is improved, but the complexity of the indicator format increases
Solution Approach 1:
The cancellation indicator is segmented into different formats based on direction: a first format for uplink cancellation and a second format for downlink cancellation. This segmentation allows each format to be optimized for its specific purpose while the overall system provides comprehensive directional coverage. The network configures which format to use based on the cancellation direction needed
Data Source
AI summary
A user equipment (UE) may receive an indicator that indicates cancellation of one or more scheduled transmissions on a group of resources. The indicator has a format that is configurable to indicate whether scheduled transmissions in a downlink direction, an uplink direction, or both are cancelled. The indicator may include an indication of the group of resources and zero or more flags indicating a direction of transmissions that are canceled, or the indicator may include two or more groups of resources that each apply to one or both of the downlink direction or the uplink direction. The UE may cancel one or more transmissions in response to the indicator.