为充分利用光电路交换(OCS)和光突发交换(OBS)两种网络技术的优点,更好地应对网络故障,提出一种新的OBS/OCS混合网络方案。根据节点对之间的数据业务需求,建立由OCS光路构成的虚拓扑(OCS层),用链路上剩余的波长资源(信道)构建OBS网络(层)。当网络中出现故障导致一条或多条OCS光路中断时,可以用已构建的OBS层,将受影响的数据分组组装成突发包发送,尝试恢复数据传送。在网络正常工作时,数据业务均通过OCS层发送。当出现突发业务导致OCS光路过载时,可以通过OBS发送超出OCS层传送容量的部分数据。与基于恢复的OCS网络、单一的OBS网络的性能相比,在不同的网络故障场景下新的OBS/OCS混合网络方案均能较好地恢复数据业务的传送;在网络正常工作时也能较好地应对突发业务。

In order to take full advantages of optical circuit switching (OCS) and optical burst switching (OBS) technology and enhance the capability to cope with network failures,a new OCS/OBS hybrid optical switching network is presented. The OCS layer of the proposed network is composed of light paths which are established according to the traffic demands between all the source-destination nodes. And the remaining wavelength channels on each physical link are used to build the OBS layer. When one or more light path breaks down due to network failure,the affected data packets can be assembled into bursts and transported through the OBS layer. In normal operating scenario,OCS layer carries most of the traffic. If bursty traffic overwhelms the transmission capacity of OCS layer,the excess part of traffic can be sent through OBS. Simulation results show that,compared with the pure OCS network with restoration and pure OBS network,the proposed hybrid optical switching network can achieve lower packet loss rate under different network failure scenarios and can accommodate bursty data streams more efficiently.