A Two-Moment Approximation for the Mean Waiting Time in the GI/G/s Queue
提出了一个简单的双矩近似公式，用于计算GI/G/s队列的平均等待时间，该公式结合了D/M/s、M/D/s和M/M/s队列的精确平均等待时间，并通过已知解验证了近似质量。
We provide a simple two-moment approximation formula for the mean waiting time in a GI/G/s queue. This formula has the form of a certain combination of the exact mean waiting times for the D/M/s, M/D/s and M/M/s queues, and hence it can be easily calculated by using some queueing tables. The quality of the approximation is tested by comparing it with known solutions in particular cases.