Conditional Uplink Cancellation for URLLC and XR Traffic
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Solution Overview
Problem
Existing 5G NR systems face challenges in managing uplink (UL) communications, particularly when URLLC transmissions are prioritized over services like extended reality (XR) that are less sensitive to delay but more sensitive to transmission failures, leading to degraded performance without significant benefits for URLLC.
Innovation Solution
Implementing a conditional cancellation indication (CCI) mechanism that allows wireless devices to determine whether to cancel a second UL transmission based on criteria such as remaining packet delay budget, channel quality, and other transmission characteristics, rather than relying solely on network node decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If URLLC transmissions are prioritized over XR transmissions by canceling UL resources, then URLLC reliability is improved, but XR service performance deteriorates due to unnecessary cancellations
Solution Approach 1:
The patent changes the parameter of cancellation decision from a simple network-initiated binary decision to a conditional decision based on multiple parameters including packet delay budget, channel quality indicators, and transmission characteristics. This allows the system to adapt the cancellation behavior dynamically based on current conditions, improving URLLC reliability only when truly necessary while preserving XR performance when conditions allow.
Solution Approach 2:
The patent introduces dynamic conditional cancellation indications that are updated based on real-time channel conditions, packet delay budgets, and transmission characteristics. The cancellation behavior is no longer static but adapts dynamically to current system state, allowing the network to prioritize URLLC when conditions demand while maintaining XR service quality when conditions permit.
2Loss of time
If unconditional cancellation indications are sent for UL resources, then URLLC latency is reduced, but overall system efficiency decreases due to unnecessary cancellations
Solution Approach 1:
The patent transforms the cancellation indication from an unconditional time-critical signal to a conditional indication that incorporates multiple parameters such as packet delay budget, channel quality, and transmission characteristics. This parameter-based conditioning reduces unnecessary cancellations while maintaining the low-latency response needed for URLLC.
Solution Approach 2:
The patent implements a feedback mechanism where the network evaluates current transmission conditions, packet delay budgets, and channel quality before issuing cancellation indications. This feedback loop ensures that cancellations are only performed when truly necessary, reducing overall system inefficiency while maintaining URLLC latency requirements.
3Extent of automation
If the network node makes all cancellation decisions, then centralized control is maintained, but decision accuracy decreases due to lack of local transmission knowledge
Solution Approach 1:
The patent implements feedback mechanisms where wireless devices report transmission characteristics, channel quality indicators, and packet delay budget status to the network node. This feedback enables the centralized network controller to make more accurate cancellation decisions by incorporating real-time local conditions from each device.
Solution Approach 2:
The patent introduces conditional parameters and evaluation criteria as intermediaries between the centralized network controller and local transmission decisions. These intermediaries carry information about local transmission conditions, channel quality, and packet characteristics, enabling the centralized controller to make informed decisions that reflect local realities without sacrificing centralized coordination.
Data Source
AI summary
The apparatus, in some aspects, may be a network node configured to transmit, based on a first UL communication associated with a first wireless device and a second UL communication associated with a second wireless device being scheduled for a same UL resource, a conditional cancellation indication (CCI) for the second UL communication of the second wireless device and to receive at least the first UL communication. The apparatus in some aspects, may be a wireless device configured to receive a CCI for an UL communication scheduled via a first UL resource, skip transmitting the UL communication via the first UL resource when a condition is met, and transmit the UL communication via the first UL resource when the condition is not met.