Shu Li

The disasters may cause multiple fiber failures, resulting in serious network capacity loss. This makes it difficult to provide enough spectrum resources for the massive unexpectedly interrupted services recovery, which requires more efficient algorithm to make better use of the remaining resources to improve the survivability of the elastic optical network (EON). Since which service flow is recovered first has impact on the total recovery ratio, this paper proposed an ordering aware service recovery algorithm with routing modulation and spectrum assignment (OASR-RMSA), and used genetic operator to find an optimal service recovery order, so that the available spectrums can be fully used and more services can be accommodated. The simulation results show the proposed algorithm has 10% improvement in blocking probability(BP) than the benchmark algorithms, when there are multiple failures in the EON.

In recent years, wireless multimedia sensor networks (WMSNs) have emerged as a prominent technique for delivering multimedia information such as still images and videos. Being under the great spotlight of research communities, however, multimedia delivery over resource- constraint WMSNs poses great challenges, especially in terms of energy efficiency and quality-of-service (QoS) guarantees. In this paper, recent developments in techniques for designing highly energy-efficient and QoS-capable WMSNs are surveyed. We first study the unique characteristics and the relevantly imposed requirements of WMSNs. For each requirement we also summarize their existing solutions. Then we review recent research efforts on energy-efficient and QoS-aware communication protocols, including MAC protocols, with a focus on their prioritization and service differentiation mechanisms and disjoint multipath routing protocols.