TSN Frame Pre-emption in Cellular Access Nodes
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently scheduling low-latency, high-priority traffic alongside lower-priority traffic, particularly in time-sensitive networking (TSN) frameworks, where hard-real-time traffic needs to be prioritized without disrupting lower-priority communications.
Innovation Solution
The method involves determining a periodic time interval for high-priority traffic based on a TSN schedule, identifying a wireless communication frame structure with distinct resources for both priorities, and scheduling high-priority traffic during reserved intervals, while allowing lower-priority traffic to use these resources outside the reserved times or on separate resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low-latency high-priority traffic is prioritized during periodic time intervals, then latency and reliability of critical communications are improved, but resource utilization for lower-priority traffic deteriorates
Solution Approach 1:
The patent implements dynamic resource allocation where the first resource is reserved for high-priority traffic during periodic time intervals but can be dynamically shared with lower-priority traffic outside these intervals. This dynamic switching between dedicated and shared resource modes resolves the contradiction by adapting resource allocation to traffic conditions.
Solution Approach 2:
The system changes the availability parameter of the first resource based on time interval conditions. During periodic time intervals, the resource is dedicated to high-priority traffic; outside these intervals, the same resource becomes available for lower-priority traffic, thereby improving overall productivity without compromising high-priority transmission reliability.
2Reliability
If separate resources are allocated for high-priority and lower-priority traffic, then transmission reliability of high-priority traffic is improved, but device complexity and resource overhead increase
Solution Approach 1:
The first resource serves multiple functions: it is dedicated to high-priority traffic during periodic time intervals and simultaneously available for lower-priority traffic outside these intervals. This multi-functionality reduces the need for completely separate resources, thereby reducing device complexity while maintaining transmission reliability.
Solution Approach 2:
The system pre-reserves the first resource for high-priority traffic during periodic time intervals in advance, ensuring transmission reliability. Outside these pre-defined intervals, the resource is automatically made available for lower-priority traffic, simplifying resource management through predetermined allocation patterns.
3Productivity
If lower-priority traffic is allowed to use resources during periodic time intervals, then resource utilization improves, but latency of high-priority traffic increases
Solution Approach 1:
The time domain is segmented into periodic time intervals for high-priority traffic and non-periodic intervals for lower-priority traffic. This temporal segmentation ensures that high-priority traffic receives dedicated resources during its designated intervals, preventing latency, while lower-priority traffic utilizes resources during non-critical intervals, improving overall resource utilization.
Solution Approach 2:
The system implements periodic time intervals where the first resource is exclusively allocated to high-priority traffic. Between these periodic intervals, the resource becomes available for lower-priority traffic. This periodic allocation pattern ensures high-priority latency requirements are met while maximizing resource utilization during non-critical periods.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. An access node may schedule traffic with different levels of priority for communications with a user equipment. The access node may receive a time-sensitive networking time-aware schedule from a first interface via an Ethernet frame that defines a set of periodic time intervals reserved for transmitting traffic with a high-priority (e.g., hard-real time traffic). In some cases, one or more frequency resources may additionally be reserved for the high-priority traffic. Accordingly, during the reserved time intervals, if the high-priority traffic is present, the access node may transmit the high-priority traffic on the reserved frequency resource(s). Outside the reserved time intervals, the access node may schedule lower-priority traffic on the reserved frequency resource(s) in addition to the other resources. Alternatively, high-priority traffic may interrupt previously scheduled lower-priority traffic during the reserved time intervals if high-priority traffic is present.