UE Reception Rules for Revoked Uplink Cancellation Conflicts
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently handling cancellation indicators for revoked uplink transmissions, leading to conflicts between semi-persistent scheduling and dynamic scheduling, which can disrupt scheduled receptions.
Innovation Solution
A method and apparatus for a user equipment (UE) and base station to determine whether to receive a scheduled reception after a cancellation indicator by implementing rules for processing indicators, such as allowing or canceling receptions based on indicator types and repetition status, ensuring coherent handling of overlapping resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cancellation indicator is received to cancel an uplink transmission, then the uplink transmission is cancelled, but the scheduled reception may be disrupted or lost
Solution Approach 1:
The patent applies preliminary anti-action by implementing reception rules that proactively protect scheduled receptions from being disrupted by cancellation indicators. The UE determines whether to receive a scheduled reception based on predefined rules that anticipate potential conflicts before they occur, rather than reacting after the cancellation indicator is received. This prevents the harmful effect of reception disruption while maintaining the ability to cancel uplink transmissions when needed.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors the relationship between cancellation indicators and scheduled receptions, and adjusts its reception behavior based on this monitoring. The feedback loop involves detecting the cancellation indicator, evaluating it against predefined rules, and determining whether to proceed with the scheduled reception. This feedback-based approach resolves the contradiction by providing adaptive control that maintains reception reliability while respecting cancellation indications.
2Productivity
If semi-persistent scheduling is used for regular receptions, then resource allocation efficiency is improved, but conflicts with dynamic scheduling and cancellation indicators increase
Solution Approach 1:
The patent applies segmentation by dividing the scheduling system into distinct components: semi-persistent scheduling for regular receptions and dynamic scheduling for flexible transmissions. The predefined rules segment the handling logic by evaluating specific conditions (such as whether a cancellation indicator is received and the timing relationships) to determine whether to proceed with semi-persistent receptions. This segmentation reduces conflicts by providing clear, rule-based decision boundaries between different scheduling types.
Solution Approach 2:
The patent utilizes parameter changes by modifying the reception behavior based on the reception rules and cancellation indicator parameters. The UE changes its reception parameters (such as whether to receive or skip the scheduled reception) based on the evaluation of cancellation indicators and their relationship to semi-persistent scheduling configurations. This allows the system to maintain high resource allocation efficiency while adapting to dynamic scheduling requirements through parameter-based control.
3Adaptability or versatility
If cancellation indicators are used to revoke uplink transmissions, then transmission flexibility is improved, but reception disruptions and acknowledgment issues occur
Solution Approach 1:
The patent applies preliminary action by establishing predefined rules before cancellation indicators are received. These rules pre-determine the conditions under which scheduled receptions should be received or skipped based on the presence and characteristics of cancellation indicators. By having these rules established in advance, the system can quickly determine acknowledgment behavior without complex real-time decisions, thereby maintaining both transmission flexibility and acknowledgment reliability.
Solution Approach 2:
The patent introduces predefined reception rules as an intermediary between cancellation indicators and reception decisions. This intermediary layer evaluates the cancellation indicator against established rules and determines the appropriate reception and acknowledgment behavior. The intermediary protects the system from direct conflicts between cancellation flexibility and reception reliability by mediating the interaction through rule-based evaluation, ensuring that acknowledgments are sent only when appropriate according to the predefined criteria.
Data Source
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AI summary
This disclosure provides methods, devices and systems for handling a reception when another scheduled transmission is canceled. In an aspect, a user equipment (UE) may receive a message from a base station scheduling a first reception for the UE on first resources. The UE may receive a first indicator scheduling a first transmission from the UE on second resources that at least partially overlap with the first resources. The UE may receive a second indicator cancelling the first transmission in a region that partially or fully overlaps the second resources. The UE may determine whether to receive the first reception on the first resources. The UE may transmit an acknowledgment indicating a reception status of the first reception in response to determining to receive the first reception. The base station may determine whether the acknowledgment indicates a reception status of the first reception.