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为了有效地降低突发包的阻塞率和保证网络的服务质量,提出了模拟光突发交换(E-OBS)网络中一种偏置时间连续可变的基于窗口资源预留机制。在E-OBS核心路由器的控制信道(CC)上设置资源预留窗口,以此决定是否允许控制包为相应的突发包预留链路资源,并且给出了该机制下关于阻塞概率的近似方程式。仿真结果表明,适当增加资源预留窗口时间,有利于降低包的阻塞率;当网络负荷大于0.1时,相比无窗口资源预留机制和基于Erlang-B公式情形,本文机制下关于阻塞概率近似方程式情形得到包的阻塞率最小,从而提高整个OBS网络的性能。
In order to effectively reduce the blocking rate of burst packets and ensure the service quality of the network, a window resource reservation mechanism based on continuously variable bias time in analog optical burst switching (E-OBS) networks is proposed. A resource reservation window is set on the control channel (CC) of the E-OBS core router to decide whether to allow the control packet to reserve the link resource for the corresponding burst and to give an approximation of the blocking probability under the mechanism equation. Simulation results show that increasing the resource reservation window appropriately can reduce the packet blocking rate. When the network load is greater than 0.1, compared with the non-window resource reservation mechanism and the Erlang-B formula, The equation results in the smallest packet blocking rate, which improves the performance of the entire OBS network.