基于串联排队网络理论,建立了端到端无线、有线级联通信网络串联排队分析模型.针对时延不敏感的海量机器对机器(M2M)小数据业务,提出无线链路上的重试排队分析模型,研究延时服务机制.用带有随机早期检测(RED)机制有限缓存的离散时间串联队列建模IP承载网络,模拟了多节点联合拥塞控制的通信场景.在概率生成函数域,推导了带有重试机制、具有异构业务到达排队系统的离去过程,并将其拟合为下一个节点的到达过程.研究结果表明,重试队列的引入,有效提高了无线链路的吞吐量,减小了阻塞率,提高了有线链路的到达率.给出了重试队列参数设置对无线链路性能的影响.
Based on the tandem queuing network theory, a model for end-to-end tandem queuing network of wireless and wireline cascade communication is established. Considering the feature of delay tolerant of machine to machine (M2M) small data service, a retrial queuing analytical model on the wireless link is forward to investigate the delayed service mechanism. The IP bearing network is modeled by a finite buffer tandem queuing network in which random early detection (RED) mechanism is deployed, the communication scenarios of multiple nodes joint congestion control is so simulated. In probability generating function domain, the departure process of a queuing system which has heterogeneous traffic arrival and adopts RED mechanism is derived, and then fit to the arrival process of its adjacent next node. Analysis shows that, by introducing retrial queue into our system, the wireless link throughput can be increased, session blocking probability is reduced and session arrival rate of wireline link is effectively improved. The influence of the parameters setting of the retrial queue on wireless link performance is investigated as well.