Dynamic Uplink Discard Timer Assignment for Wireless Devices
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Solution Overview
Problem
Current wireless networks use a static SDU discard timer for all UEs, which fails to optimize performance due to varying RF conditions, leading to suboptimal user experience, especially in poor RF conditions.
Innovation Solution
The system dynamically assigns a discard timer to each UE based on cell utilization and RF conditions, using different thresholds for congested and non-congested cells, and considering the UE's RF conditions and application type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static discard timer is assigned to all UEs, then the configuration is simple and easy to implement, but it fails to optimize performance for UEs in varying RF conditions
Solution Approach 1:
The patent implements dynamic discard timer assignment where the timer value is adjusted based on real-time RF conditions and cell utilization. The access node monitors RF conditions for each UE and dynamically selects appropriate discard timer values from a set of predefined values, transforming the static configuration into a dynamic adaptive system that responds to changing network conditions
Solution Approach 2:
The patent changes the discard timer parameter based on RF conditions and cell utilization metrics. Different discard timer values are assigned according to the severity of RF conditions (e.g., poor, fair, good) and network congestion levels, allowing the system to optimize packet handling behavior for different operational scenarios without requiring complete system redesign
2Reliability
If a long discard timer is used for UEs in poor RF conditions, then packet loss is reduced, but queuing delay increases
Solution Approach 1:
The patent adjusts the discard timer parameter based on RF conditions - using longer timer values for UEs in poor RF conditions to prevent premature packet discarding and improve reliability, while using shorter timer values for UEs in good RF conditions to minimize queuing delay. This conditional parameter adjustment optimizes the trade-off between reliability and latency for different operational scenarios
Solution Approach 2:
The patent applies different discard timer values to different UEs based on their individual RF conditions rather than using a uniform timer for all UEs. Each UE receives a tailored discard timer configuration appropriate to its specific channel conditions, allowing optimal performance for each user while managing overall network resources efficiently
3Productivity
If a short discard timer is used to reduce queuing delay, then link utilization is improved, but packet loss increases in poor RF conditions
Solution Approach 1:
The patent dynamically changes the discard timer parameter based on RF conditions - using shorter values to improve link utilization and reduce queuing delay when RF conditions are good, and longer values to maintain reliability when RF conditions are poor. This adaptive parameter adjustment allows the system to optimize for productivity when conditions permit while maintaining reliability when conditions deteriorate
Data Source
AI summary
Systems and methods are provided for assigning PDCP discard timers to wireless devices with active non-GBR sessions. The systems and methods evaluate cell utilization for a cell with respect to a cell utilization threshold and define the cell as congested or non-congested based on the evaluation. Further, RF conditions are evaluated for the wireless device with respect to a first RF conditions threshold for the non-congested cell and a second RF conditions threshold for the congested cell. Systems and methods further select a discard timer for the wireless device based on the evaluation of the cell utilization with respect to the cell utilization threshold and the evaluation of the RF conditions with respect to the RF conditions thresholds.