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Modeling Impatient Customer Behavior in Multi-Queue Communication Networks


Core Concepts
This work presents a decentralized decision model for impatient customers to jockey between queues in multi-tenancy cloud environments, based on continuous evaluation of expected waiting times.
Abstract
The paper proposes a behavioral model for jockeying behavior of impatient customers in multi-queue communication networks, deviating from classical statistical approaches. Key points: Existing approaches model jockeying based on a preset threshold derived from queue length differences. The authors argue this is not suitable for latency-sensitive multi-access edge computing (MEC) systems. The proposed model uses a decentralized decision-making approach, where customers continuously evaluate their expected waiting time to decide whether to jockey to another queue. The authors develop a computational setup with two infinite buffers, where new arrivals follow a "join the shorter queue" strategy. Service rates are heterogeneous and exponentially distributed. The decision to jockey is based on the expected waiting time at the current position versus the preferred queue, considering new arrivals and departures. Analytical expressions are derived to characterize the frequency of jockeying behavior, using concepts from probability theory. Numerical simulations are conducted to study the parametric dependencies and sensitivity of the jockeying behavior. The results show the benefits of jockeying in terms of reduced waiting times, but also discuss potential limits on the number of times jockeying should be allowed. The authors highlight areas for future work, such as incorporating costs and discounts into the jockeying decision, and exploring stochastic optimization approaches to bound the impatience behavior.
Stats
The service rates at each simulation run were computed using the following equation: μi = λ + δλ/2, μj = λ - δλ/2 where δλ was a random parameter to guide the magnitude of |μ1 - μ2|.
Quotes
"Deviated from classical approaches that statistically model the jockeying phenomena in queuing systems, our work pioneers to setup a behavioral model of jockeying impatient tenants." "Efforts towards standardization of interfaces for interactivity by the Third Generation Partnership Project (3GPP) Consortium also propose the exposure of network core function metrics to accelerate the intelligence, requisite for self-organising behavior."

Key Insights Distilled From

by Anthony Kigg... at arxiv.org 04-05-2024

https://arxiv.org/pdf/2402.11054.pdf
Resource Allocation in Mobile Networks

Deeper Inquiries

How can the jockeying decision be further optimized by incorporating factors like task migration costs, holding costs, and expected waiting time before joining the queues

Incorporating factors like task migration costs, holding costs, and expected waiting time before joining the queues can significantly optimize the jockeying decision in mobile networks. By introducing these additional metrics into the decision-making process, the system can better balance the trade-offs between minimizing waiting times and considering the associated costs. Task migration costs can influence the decision to jockey by assigning a value to the act of moving tasks between queues. By factoring in these costs, the system can prioritize jockeying decisions that result in significant time savings while keeping migration expenses in check. Holding costs, on the other hand, can incentivize tasks to stay in their current queues for longer durations, especially if the cost of switching outweighs the benefits of reduced waiting times. Expected waiting time before joining the queues can act as a predictive measure for tasks, allowing them to anticipate the potential delays in each queue. By considering this metric, tasks can make more informed decisions about jockeying based on their tolerance for waiting and the expected service times in different queues. Overall, by integrating these factors into the decision model, the jockeying behavior can be optimized to strike a balance between minimizing waiting times, managing costs, and improving overall system efficiency.

What are the potential drawbacks or unintended consequences of allowing unlimited jockeying behavior in 6G communication systems, and how can an optimal bound be determined

Allowing unlimited jockeying behavior in 6G communication systems can lead to several potential drawbacks and unintended consequences. One major issue is the risk of creating instability and inefficiency in the system due to constant task migrations. Unlimited jockeying can result in tasks continuously switching between queues, causing disruptions, delays, and potential bottlenecks in the network. Moreover, unlimited jockeying behavior can lead to a lack of system predictability and control. Without a bound on the number of times tasks can jockey, the system may struggle to maintain stability and optimal performance. Tasks may keep moving between queues without achieving significant improvements in waiting times, leading to wasted resources and increased complexity in system management. To determine an optimal bound for jockeying behavior in 6G communication systems, a thorough analysis of system dynamics, performance metrics, and cost-benefit trade-offs is essential. By conducting simulations and experiments, the system can identify the point at which the benefits of jockeying start diminishing, and the costs and disruptions outweigh the advantages. Establishing this optimal bound can help maintain system stability, efficiency, and overall performance.

How can the proposed decentralized decision-making model be extended to handle more complex queuing systems beyond the M/M/2 setup, such as M/G/C or G/G/C, and what additional insights could be gained

Extending the proposed decentralized decision-making model to handle more complex queuing systems beyond the M/M/2 setup, such as M/G/C or G/G/C, requires a deeper understanding of the system dynamics and additional considerations for heterogeneous service rates, arrival patterns, and queue configurations. One approach to extending the model is to incorporate probabilistic distributions for service times and arrival rates that align with the characteristics of M/G/C or G/G/C queuing systems. By adapting the decision-making framework to accommodate these variations, the model can provide insights into how different system parameters impact jockeying behavior and waiting times. Furthermore, the decentralized model can be enhanced by introducing adaptive learning algorithms or reinforcement learning techniques to enable tasks to dynamically adjust their jockeying decisions based on real-time feedback and system conditions. This adaptive approach can improve the efficiency and responsiveness of the decision-making process in complex queuing environments. Overall, extending the decentralized decision-making model to handle more complex queuing systems opens up opportunities to gain deeper insights into the behavior of impatient customers, optimize resource allocation, and enhance the overall performance of next-generation mobile communication networks.
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