scholarly journals Analysis of Hybrid Buffering and Retransmission in OBS Networks

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
D. Veera Vanitha ◽  
M. Sabrigiriraj
Keyword(s):  
Retrial Queue ◽  
Wavelength Converters ◽  
Single Server ◽  
Contention Resolution ◽  
Delay Lines ◽  
Hybrid Scheme ◽  
Maintenance Activity ◽  
Burst Switching ◽  
Fiber Delay Lines ◽  
The Mean

Burst contention is a major problem in the Optical Burst Switching (OBS) networks. Due to inadequate contention resolution techniques, the burst loss is prominent in OBS. In order to resolve contention fiber delay lines, wavelength converters, deflection routing, burst segmentation, and retransmission are used. Each one has its own limitations. In this paper, a new hybrid scheme is proposed which combines buffering and retransmission, which increases the mean number of bursts processed in the system. In this hybrid method, retransmission with controllable arrival and uncontrollable arrival is analyzed. Normally all the bursts reach the first hop and few of them go for second hop to reach destination. After all the bursts reach the destination the server may go for maintenance activity or wait for the arrival of next burst. We model it as a batch arrival single server retrial queue with buffer. Numerical results are analyzed to show the mean number of bursts processed in the system with uncontrollable arrival and controllable arrivals.

Optimization of WDM optical packet switches with sparse Wavelength Converters and non-degenerate Fiber Delay-Lines

2005 ◽  
Vol 22 (4) ◽  
pp. 333-344
Author(s):  
Zhizhong Zhang ◽  
Fang Cheng ◽  
Huandong Zhao ◽  
Qingji Zeng
Keyword(s):  
Wavelength Converters ◽  
Delay Lines ◽  
Packet Switches ◽  
Fiber Delay Lines

Contention resolution and QoS provisioning using sparse fiber delay lines in WDM networks

2006 ◽  
Vol 13 (1) ◽  
pp. 111-122 ◽  
Author(s):  
Mounire El Houmaidi ◽  
Mostafa A. Bassiouni ◽  
Guifang Li
Keyword(s):  
Wdm Networks ◽  
Contention Resolution ◽  
Delay Lines ◽  
Qos Provisioning ◽  
Fiber Delay Lines

Stability condition for a single-server retrial queue

1993 ◽  
Vol 25 (03) ◽  
pp. 690-701 ◽  
Author(s):  
Huei-Mei Liang ◽  
V. G. Kulkarni
Keyword(s):  
Stability Condition ◽  
Service Time ◽  
Retrial Queue ◽  
Arrival Rate ◽  
Retrial Queues ◽  
Single Server ◽  
Sufficient Stability Condition ◽  
Sufficient Stability ◽  
The Mean ◽  
The Stability

A single-server retrial queue consists of a primary queue, an orbit and a single server. Assume the primary queue capacity is 1 and the orbit capacity is infinite. Customers can arrive at the primary queue either from outside the system or from the orbit. If the server is busy, the arriving customer joins the orbit and conducts a retrial later. Otherwise, he receives service and leaves the system. We investigate the stability condition for a single-server retrial queue. Let λ be the arrival rate and 1/μ be the mean service time. It has been proved that λ / μ < 1 is a sufficient stability condition for the M/G /1/1 retrial queue with exponential retrial times. We give a counterexample to show that this stability condition is not valid for general single-server retrial queues. Next we show that λ /μ < 1 is a sufficient stability condition for the stability of a single-server retrial queue when the interarrival times and retrial times are finite mixtures of Erlangs.

An Optical Packet Switch with Recirculation Limited Range Wavelength Converter Groups and Recirculation Optical Buffers

2016 ◽  
Vol 37 (2) ◽  
Author(s):  
Jie Li
Keyword(s):  
Control Algorithm ◽  
Wavelength Conversion ◽  
Limited Range ◽  
Loss Probability ◽  
Wavelength Converters ◽  
Delay Lines ◽  
Wavelength Converter ◽  
Fiber Delay Lines ◽  
Optical Packet Switch ◽  
Packet Switch

AbstractThis paper focuses on performances of limited range wavelength converters (LRWCs) in resolving optical packet contentions. An optical packet switch is proposed, which uses recirculation LRWC groups and recirculation fiber delay lines (FDLs) to resolve optical packet contentions. In order to make full use of the LRWCs and the FDLs, a control algorithm is also proposed. Packet loss probability of the proposed switch versus the number of FDLs, the wavelength conversion range, and the number of LRWC groups are evaluated in detail.

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