Towards Safe Load Balancing based on Control Barrier Functions and Deep Reinforcement Learning
This addresses the need for reliable and safe-to-operate network systems in commercial solutions, though it is incremental as it builds on existing DRL methods with safety enhancements.
The paper tackles the problem of safe load balancing in SD-WAN by combining Deep Reinforcement Learning with Control Barrier Functions to ensure safe actions, achieving near-optimal QoS performance with end-to-end delay improvements while respecting link capacity constraints.
Deep Reinforcement Learning (DRL) algorithms have recently made significant strides in improving network performance. Nonetheless, their practical use is still limited in the absence of safe exploration and safe decision-making. In the context of commercial solutions, reliable and safe-to-operate systems are of paramount importance. Taking this problem into account, we propose a safe learning-based load balancing algorithm for Software Defined-Wide Area Network (SD-WAN), which is empowered by Deep Reinforcement Learning (DRL) combined with a Control Barrier Function (CBF). It safely projects unsafe actions into feasible ones during both training and testing, and it guides learning towards safe policies. We successfully implemented the solution on GPU to accelerate training by approximately 110x times and achieve model updates for on-policy methods within a few seconds, making the solution practical. We show that our approach delivers near-optimal Quality-of-Service (QoS performance in terms of end-to-end delay while respecting safety requirements related to link capacity constraints. We also demonstrated that on-policy learning based on Proximal Policy Optimization (PPO) performs better than off-policy learning with Deep Deterministic Policy Gradient (DDPG) when both are combined with a CBF for safe load balancing.