Green Distributed Quality of Transmission Aware Routing and Wavelength Assignment in All-Optical Networks

Abstract

The Routing and Wavelength Assignment (RWA) algorithms that consider quality of transmission (QoT) in light-path setup spend more time than their conventional counterparts due to exhaustive search and QoT estimation. This paper proposes distributed Quality of Transmission Aware Routing and Wavelength Assignment (QARWA) algorithm to handle dynamic light-path provisioning in wavelength routed all-optical networks taking energy consumption of optical switch nodes into account. Specifically, the QARWA considers bit-error rate (BER), setup delay, and energy consumption constraints at the same time, and establishes light-paths with small BER, low setup latency, and reduced energy consumption. We present and evaluate an enhanced wavelength-assignment solution in the QARWA to handle the wavelength continuity constraint. In QARWA, a source node determines the connection path by means of the shortest path algorithm and a destination node selects a wavelength based on the BER limitation and decreasing order of setup latency. Relating energy consumption to processing time, we show that QARWA can decrease the total energy consumption by reducing the processing time at each node. Under QARWA, when a node finishes the processing of the last control packet, it makes transition to either sleep state or idle state. Hence, QARWA can provide the best performance since it can reduce processing time in control units, light-path setup latency, and energy consumption of nodes.

Optimal Power Efficient Management Scheme (OPEM): A New Power Efficient Approach for Mobile Stations in Two-Tier and Three-Tier Networks

“…Therefore, the MHLR in OPEM is similar to MHLR in MR. Note that, the turning on or off procedures can be done by a switch-off based approach like [25] and the QARWA mechanism [26] in wireless networks (i.e., cellular network and WLAN) and PON, respectively. Hence, when low-tier, medium-tier or high-tier networks do not transmit/receive any data, these tiers can be turned off in OPEM, like PSR or PMR.…”