OBS网络中的虚拟突发交换技术

Virtual burst switching in optical burst switched networks

针对由于网络复杂度提高,突发数据在预留时冲突可能性增大,导致OBS网络性能下降的情况,提出OBS网络中的虚拟突发交换技术和相应的实现技术。其汇聚机制是基于服务类别的虚拟汇聚,调度策略对应有两种:非抢占调度策略和抢占调度策略。利用虚拟突发交换技术有利于减少信道碎片,提高链路利用率,提供可靠的QOS保证。用OPNET系统仿真工具进行验证,结果表明:虚拟突发交换与OBS传统交换方式相比有较高网络链路的利用率,较少的控制分组和数据突发的丢包率,增加了整个网络的吞吐量。

With the increasing complexity of network, the possibility of conflict increases in channel reservation for data burst. It results in the performance decrease of OBS network. For the case, OVBS is proposed. Its assembly scheme is based on service types, the corresponding scheduling strategy is divided into two kinds： the preemptive and non-preemptive strategies. Using this technology can avoid dividing the channel into the less pieces, link utilization and QOS guarantee are increased, rIhe simulation results show that OVBS can decrease packet drop rate, increase link bandwidth usage and network throughput in different source offer load, enhance OBS network performance.