Sidelink and Uplink Priority Cancellation to Protect High-Priority Traffic
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Solution Overview
Problem
Existing wireless communication systems do not effectively manage interference between low and high priority data transmissions, particularly in sidelink and uplink communications, leading to disruptions in scheduling and reduced reliability of high priority traffic.
Innovation Solution
Implementing a priority threshold mechanism where base stations transmit cancellation indications to user equipment (UEs) to cancel low priority transmissions, allowing high priority data to use allocated resources, thereby reducing interference and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low priority transmissions are allowed to use allocated resources, then resource utilization is improved, but interference with high priority traffic increases and reliability deteriorates
Solution Approach 1:
The system dynamically adjusts transmission priorities by introducing a cancellation indication mechanism that can change the status of allocated resources in real-time. Base stations can dynamically cancel low priority transmissions when high priority traffic needs resources, making the resource allocation flexible rather than static.
Solution Approach 2:
The invention changes the priority parameter of transmissions by comparing message priorities against a threshold. When a low priority message is detected and a cancellation indication is received, the system changes its transmission status from active to cancelled, effectively changing the priority parameter to resolve the contradiction between resource utilization and reliability.
2Reliability
If cancellation indication mechanism is implemented, then high priority transmission reliability is improved, but system complexity increases
Solution Approach 1:
The invention extracts the priority management function from the general scheduling system into a separate cancellation indication mechanism. This dedicated mechanism handles priority conflicts independently, simplifying the overall system architecture by separating concerns rather than embedding complex priority arbitration throughout the scheduling logic.
Solution Approach 2:
The cancellation indication acts as an intermediary signal between the base station and UEs, mediating the conflict between high and low priority transmissions. This intermediary mechanism provides a clear, standardized way to resolve priority conflicts without requiring complex negotiation or arbitration protocols between system components.
3Object-affected harmful factors
If priority threshold is set low, then more transmissions are cancelled reducing interference, but resource utilization decreases
Solution Approach 1:
The system applies partial cancellation action by only cancelling low priority transmissions when high priority traffic actually needs the resources. The cancellation is not blanket-based but selectively applied based on actual high priority traffic demands, avoiding excessive cancellation that would unnecessarily reduce resource utilization.
Solution Approach 2:
The base station monitors high priority traffic conditions and provides feedback through cancellation indications only when necessary. This feedback mechanism allows the system to adjust resource allocation dynamically based on actual traffic conditions, preventing unnecessary cancellations and maintaining optimal resource utilization while still protecting against interference when needed.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A base station may transmit a configured grant that indicates time-frequency resources for a user equipment (UE) to use to transmit sidelink or uplink messages in a wireless communications system. To reduce the amount of low priority traffic that may interfere with higher priority traffic, the base station may configure a threshold probability to allow high priority sidelink transmissions and to cancel low priority transmissions. The base station may transmit a cancellation indication that includes a priority indication instructing the UE to cancel transmissions having a priority less than a priority threshold during the allocated time-frequency resources. Based on transmitting the cancellation indication, the base station may cancel transmissions that have low priority, and the UE may determine whether to transmit (or to refrain from transmitting) one or more messages based on the priority of the message.