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| 光突发交换网络中支持服务质量的一种新方案 |
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徐昌彪1,2, 隆克平2, 张碧波2
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1.重庆大学,测控及遥感研究院,重庆,400044;2.重庆邮电大学,通信与信息工程学院,重庆,400065
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| 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. |
| 关键词: 光突发交换 服务质量 区分服务 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant No.90304004(国家自然科学基金);the Base Programs for Application of Chongqing Science and Technology Committee of China under Grant Nos.8060,8061(重庆市科委应用基础项目);the Programs for Science & Tech |
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| A New Approach in Optical Burst Switching Networks with QoS Support |
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XU Chang-Biao,LONG Ke-Ping,ZHANG Bi-Bo
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| Abstract: |
| 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 failing 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. |
| Key words: optical burst switching(OBS) quality of service(QoS) differentiated service |
