Performance Improvement Methods for Burst-Switched Networks

Abstract

Abstract-In this paper, we present a performance model of optical burst switching (OBS) that can explain the degradation of OBS throughput performance when the control packet processing time increases. We then use the proposed performance model to investigate three feasible methods to improve OBS performance without significantly increasing the implementation complexity: addition of simple fiber delay lines (FDLs), random extra offset time, and window-based channel scheduling (WBS). Additional FDLs can eliminate the negative impact caused by the variation of the offset time between control packets and data bursts. The random extra offset time approach does not require any additional hardware and computational capability in the nodes. If higher computational capability is available, WBS in general can provide better throughput improvement than that of random extra offset time when FDLs are used in the nodes to compensate the processing time. Simulation results show that a combination of the proposed methods can significantly improve OBS performance.

Efficient Predictable Probe of Optical Burst Switched For Wireless Feeler Bond

“…After an offset time, the source node sends out the data burst following the same routing path of the control packet. The minimum offset time between the control packet and the data burst is Toff = H ×Tcp + Tsw, (1) whereTsw is the required switch reconfiguration time at each node, Tcp is the processing time of a control packet in a node, H is the number of hops to the destination from the current location of the control packet. Hence, H is equal to the total hop count of the path when the control packet is at the source and decreases by one for each intermediate node the control packet passes.…”

“…In WBS, additional Twd time will increase the equivalent control packet processing time to Tcp + Twd. We assume that Tcp is much larger than L or the Twd delay time is compensated [1]. WBS OBS assuming large Tcp does not require any additional hardware and only needs to extend the initial offset time at the source.…”

Performance analysis of optical burst switching using burst delay feedback scheduling with different methods

“…We assume delay time is compensated [1]. Windowbased scheduling assuming large does not require any additional hardware and only needs to extend the initial offset time at the source.…”

A QoS‐supported controlled burst retransmission scheme in OBS networks

“…In this case, if the bandwidth requirement has been satisfied, the burst will travel through core nodes successfully; otherwise, it will be blocked. In a blocking OBS network system, various schemes have been proposed to resolve burst contention in intermediate nodes, such as optical buffering , wavelength conversion , deflection routing , and burst segmentation (BS) , to reduce the data losses in contentions.…”

“…Ana priority 0, a 1,2,3,4 = 0.8 Sim priority 0, a 1,2,3,4 = 0.8 Ana priority 0, a 1,2,3,4 = 0.6 Sim priority 0, a 1,2,3,4…”