Dynamic Reliability Targets for Wireless Network Flows
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Solution Overview
Problem
Current QoS definitions for URLLC in wireless networks do not adequately address the stringent optimization criteria for ultra-high reliability and extremely low latency, as they fail to consider the impact of consecutive packet transmission errors and survival time on application-level failures, leading to potential system unavailability.
Innovation Solution
A dynamic reliability target system is implemented, where network nodes determine and adjust reliability targets based on the number of consecutive packet transmission errors and remaining survival time for each flow, allowing for adaptive resource allocation to maintain system availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed reliability target is used for packet transmission, then the system configuration is simple, but the system cannot adapt to consecutive packet errors and may cause application-level failures
Solution Approach 1:
The patent implements dynamic reliability targets that adapt based on consecutive packet error counts. The network node determines different reliability targets for different numbers of consecutive errors (e.g., first error, second error, third error), allowing the system to respond to changing conditions rather than using a static reliability target throughout the connection lifecycle.
Solution Approach 2:
The patent changes the reliability target parameter based on the number of consecutive packet errors observed. When errors occur, the system selects from multiple predefined reliability targets (e.g., 99%, 99.9%, 99.99%) depending on the error count, thereby adjusting the transmission parameters to maintain application-level availability while adapting to degraded conditions.
2Reliability
If resource allocation is increased to prevent packet transmission errors, then reliability improves, but resource efficiency decreases
Solution Approach 1:
The patent dynamically adjusts transmission parameters including reliability targets, modulation and coding schemes (MCS), and resource allocation based on the observed number of consecutive packet errors. When error counts are low, the system uses more efficient (lower reliability) parameters to conserve resources. When error counts increase, the system transitions to more robust (higher reliability) parameters only for the affected packets, thereby optimizing the trade-off between reliability and resource efficiency.
Solution Approach 2:
Instead of applying high-reliability transmission parameters to all packets continuously, the patent applies enhanced reliability measures only partially - specifically when and where packet errors occur. This selective application of resources avoids the waste of constantly using excessive resources while still protecting against application-level failures when needed.
3Reliability
If transmission parameters are adjusted frequently to maintain reliability, then system availability improves, but latency increases
Solution Approach 1:
The patent implements dynamic adjustment of reliability targets based on consecutive error counting, where the system monitors packet transmission success and adapts parameters only when errors occur. This dynamic approach allows the system to maintain low latency during good conditions while rapidly responding to degradation events, balancing availability and latency requirements for URLLC applications.
Data Source
AI summary
A method may include determining, by the network node for a flow, a plurality of reliability targets, wherein each reliability target of the plurality of reliability targets is associated with a different number of consecutive packet transmission errors for the flow and/or associated with a different value or range of values of a remaining survival time for the flow; determining, by the network node for a flow, a number of consecutive packet transmission errors or a remaining survival time for the flow; and determining, by the network node, a reliability target of the plurality of reliability targets, for a next packet transmission for the flow based on at least one of the number of consecutive packet transmission errors or the remaining survival time for the flow.