中文摘要：

考虑了重试时间为指数分布且两个服务器的服务率不同的M／M／2重试排队．通过矩阵分析方法，把模型转化为一个与水平相依的拟生灭过程，从而更有利于算法实现．得到了稳态概率分布和重试空间中的平均人数等排队指标，并且通过数值算例将到达率等参数对系统人数分布的影响显示出来．

英文摘要：

This paper concerns an M/M/2 retrial queue where the retrial time has an exponential distribution and two servers＇ service rates are different. By using the matrix analytic method, this model is formulated as a level-dependent Quasi-Birth-and-Death （QBD） process which makes the model much more algorithmically tractable. Several performance measures such as the stationary probability distribution and the expected number of customers in the orbit are obtained, and finally the effects of some varying parameters on the system are shown by some numerical results.