An efficient dynamic multicast traffic-grooming algorithm for WDM networks
- PDF / 794,212 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 99 Downloads / 231 Views
An efficient dynamic multicast traffic-grooming algorithm for WDM networks Huan-Lin Liu · Xiang Xue · Yong Chen · Qiang Fang · Sheng Huang
Received: 1 April 2013 / Accepted: 15 August 2013 / Published online: 3 September 2013 © Springer Science+Business Media New York 2013
Abstract With the growth of multi-granularity multicast applications, there comes into being a huge gap between the bandwidth of a wavelength provided and a multicast traffic required in the wavelength division multiplexing (WDM) networks. The dynamic multicast traffic-grooming is an effective way for WDM networks to improve the wavelength utilization and decrease the traffic blocking probability. A novel switching node architecture with the multicast switching matrix and traffic-grooming fabric is studied in the paper. Then, an efficient dynamic multicast traffic-grooming algorithm is proposed for the architecture. According to the ratio of network available grooming port number to network transceiver number, the proposed algorithm estimates whether the traffic-grooming port is a scarce resource for input traffic and chooses the appropriate grooming strategy. If the trafficgrooming port is scarce, the minimized use grooming port strategy is designed for the coming traffic. On the contrary, the minimized use node transceiver strategy is applied for the coming traffic. Simulation results show that the proposed algorithm can groom traffic efficiently with low blocking probability and high network throughput constraint by limiting number of node transceivers and grooming ports. Keywords WDM networks · Optical multicast · Dynamic traffic-grooming · Grooming port · Blocking probability · Network throughput H.-L. Liu · X. Xue · Y. Chen (B) · Q. Fang · S. Huang Chongqing Key Laboratory of Signal and Information Processing, Key lab of Optical Fiber Communication Technology, School of Automation, Chongqing University of Posts and Telecom (CQUPT), Chongwei Road #2, Nanan Disdrit, Chongqing 400065, China e-mail: [email protected] H.-L. Liu e-mail: [email protected]
1 Introduction Development with the wavelength division multiplexing (WDM) and the dense wavelength division multiplexing (DWDM), a fiber bandwidth at Tbps is divided into a number of wavelengths where a wavelength bandwidth rate is at Gbps. With the application of multi-granularity multicast, there exists a large gap between the capacity of a WDM bandwidth resource (e.g., OC-192, or OC-768) and the traffic required bandwidth (e.g.,OC-1, OC-3 or OC-12). The huge difference between bandwidth supply and traffic bandwidth demand leads to low utilization of the limited number of wavelength resource. Especially, the wavelength-based optical light-tree causes a huge bandwidth waste for the low-speed traffic request [1,2]. As a fiber link has limited wavelength channel and the optical switching node has limited optical transceivers, it is impossible for each multicast traffic request to establish end-to-end light-tree wavelength connection. Therefore, it is essential to groom these smallbandwidth mul
Data Loading...
