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中文摘要：
提出了光突发交换网络支持服务质量的一种新方案．在此方案中，核心节点根据到达的数据突发的优先级别，将每一出口链路的数据信道进行分组．每一组别的数据信道数主要取决于相应优先级别的数据流量．通常情况下，属于某优先级别的数据突发会被调度在相应组别的数据信道上．在高优先级别的数据突发未能预留在其相应组别的数据信道上时，可尝试为其在低组别的数据信道上预留，甚至抢占低组别内已经被预留的信道；低优先级别的数据突发不能被预留在高组别的数据信道上．另外．也考察了抢占数据突发长度与被抢占数据突发长度之间的关系．
英文摘要：
A new approach in optical burst switching （OBS） networks with QoS support is presented in this paper. In the approach, the data channels of an outgoing link at a core node are divided into multiple groups, with each group corresponding to a service class. The number of data channels in each group is mainly determined by data traffic. In general, a data burst （DB） can be sent on a data channel reserved by its burst head packet （BHP） only in its own group. Upon falling to reserve any bandwidth in its own group, the BHP tries to re-reserve even preempted bandwidth on a data channel in a lower-priority group. A lower-priority BHP can＇t reserve bandwidth on any data channel in a higher-priority group. In addition, the reasonable relation between the preempting DB length and the preempted DB length is also investigated in this paper.
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