Dynamic Uplink Split Threshold for 4G-5G DRBs
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Solution Overview
Problem
Current radio access network systems face challenges in dynamically optimizing uplink split thresholds for Data Radio Bearers (DRBs) across 4G and 5G networks, leading to inefficient data transmission and resource utilization due to static threshold settings, which do not account for varying traffic conditions and radio conditions of User Equipment (UEs).
Innovation Solution
Implementing a method that periodically computes and dynamically updates uplink split threshold parameters based on Buffer Status Reports (BSR), UL data volume, PRB utilization, and cell throughput, using the Near-Real-Time RIC (near-RT RIC) to adjust these thresholds for individual DRBs, optimizing data transmission across 4G and 5G legs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If static threshold settings are used for uplink split DRBs, then system complexity is reduced and ease of operation is improved, but uplink data throughput and resource utilization deteriorate due to inability to adapt to varying traffic and radio conditions
Solution Approach 1:
The patent implements dynamic threshold adjustment for uplink split DRBs by introducing a new information element (IE) that carries threshold values updated based on real-time buffer status reports (BSR) and radio conditions. The network side (gNB/eNB) periodically updates the ul-DataSplitThreshold parameter for each split DRB based on observed traffic patterns and radio conditions, transforming the static threshold into a dynamic parameter that adapts to changing conditions, thereby improving uplink throughput without requiring complex UE-side decision logic
Solution Approach 2:
The patent establishes a feedback mechanism where the network side monitors uplink buffer status through BSR messages from the UE and uses this information to adjust the uplink split threshold. The network side sends updated threshold values back to the UE through RRC reconfiguration or MAC CE commands, creating a closed-loop control system that continuously optimizes the split threshold based on actual network conditions and traffic demands
2Productivity
If dynamic threshold adjustment is implemented for individual DRBs, then uplink data transmission performance is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies different threshold values for different logical channels and DRBs based on their specific QoS requirements and traffic characteristics. Each split DRB can have its own customized ul-DataSplitThreshold parameter, allowing the system to optimize performance locally for each bearer while maintaining overall network efficiency. This per-DRB customization enables fine-grained control without requiring complex global optimization algorithms
Solution Approach 2:
The patent introduces a new configurable parameter ul-DataSplitThreshold that can be dynamically adjusted in bytes (e.g., b100, b200, b400, b800, b1600, b3200, b6400, b12800, b25600, b51200, b102400, b204800, b409600, b819200, b1638400, b3276800, b6553600, infinity). This parameter change mechanism allows the network to adapt the split threshold to different traffic scenarios, QoS requirements, and radio conditions without changing the fundamental protocol structure, thereby improving performance with minimal complexity increase
3Reliability
If per-DRB threshold optimization is implemented, then resource utilization and packet delivery reliability are improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent designs the ul-DataSplitThreshold parameter to serve multiple functions simultaneously: it controls the uplink data split behavior, influences resource allocation efficiency, and indirectly manages QoS performance. This multi-functionality reduces the need for separate signaling mechanisms for each objective, as a single parameter adjustment can achieve multiple performance improvements including better packet delivery reliability and reduced signaling overhead
Data Source
AI summary
Described are systems and methods for updating a UL split threshold for a 4G leg and 5G leg for a number of split Data Radio Bearers (DRBs) using a Near-Real Time RIC or 5G Central Unit. A Near-Real Time RIC or 5G Central Unit subscribes to receive UL split threshold parameters from a gNB or eNB E2 node to determine whether to change the values of UL split threshold parameters for UL split DRBs. If so, the UL split threshold parameters are updated at the E2 node and communicated to the UE.