光突发交换网络中基于突发包分段的联合冲突解决方法研究  

Composite Contention Resolution Mechanism Based on Burst Segmentation in Optical Burst Switching Networks

作　　者：管爱红[1] 张海芳[1] 李青海[2] 

机构地区：[1]河南工业大学信息科学与工程学院,河南郑州450001 [2]河海大学物联网工程学院,江苏南京210098

出　　处：《激光与光电子学进展》2014年第4期45-51,共7页Laser & Optoelectronics Progress

基　　金：河南省高等学校青年骨干教师资助计划(2011GGJS-081);河南省教育厅自然科学研究计划(13A510163)

摘　　要：光突发交换(OBS)技术由于结合了电的灵活处理和光的高速传输,成为构建下一代全光互联干线网最具前景的交换方式,其单向资源预留方式导致的突发包冲突是限制OBS走向实用的关键。基于突发包分段的光缓存冲突解决方法和基于突发包分段的波长转换冲突解决方法,首先通过对低优先级突发包进行分段解决冲突,然后对分段后冲突部分突发包进行光缓存或波长转换降低丢包率。对基于突发包分段的光缓存和基于突发包分段的波长转换两种冲突解决机制的性能进行了比较研究,仿真结果显示:两种机制都能够有效地降低整个网络的丢包率。当网络负荷较高时,采用基于突发包分段的光缓存方法对降低突发包的丢失率效果比较明显;当网络负荷较低时,采用基于突发包分段的波长转换方法能够更加有效地降低突发包的丢失率。Optical burst switching （OBS） is a promising solution for the next generation backbone internet which can exploit the hugy bandwidth of dense wavelength division multiplexing（DWDM） technology and the flexibility of electronic switching. An improtant issue in OBS technology is burst contention which causes performance degradation. The optical buffer resolution based on segmentation segments burst firstly, and then the segmented burst is buffered. The wavelength conversion conflict resolution based on segmentation segments burst firstly, and then the segmented burst is wavelength converted. Comparison between the two contention resolutions is made. The result of comparison shows that when the network load is high, the optical buffer conflict resolution based on bust segmentation can efficiently reduce the burst loss probability. When the network load is low, the wavelength conversion conflict resolution based on bust segmentation can efficiently reduce the burst loss probability.

关 键 词：光通信 光突发交换 优先级 突发包分割 光缓存 波长转换 

分 类 号：TN929.11[电子电信—通信与信息系统]