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In recent years, Wireless Sensor Network (WSN) which consists of a large number of sensor nodes having wireless communication and self-organizing capability receives much attention. The design of protocols for such networks has to be energy aware in order to prolong the lifetime of the network. Multi-hop and clustering communication are most efficient routing methods in WSN. Multi-hop communication...
OPS (optical packet switching) networks are considered as one of promising candidates for new generation network architecture. However, optical RAM has not been realized yet. Hence, high packet loss probability is a serious issue on feasible OPS networks. Now, there are some ways to solve this issue. The first approach is the usage of congestion avoidance devices like wavelength converter, fiber delay...
We report the progress in the development of an operand routing network (ORN) for an SFQ reconfigurable data-paths processor (SFQ-RDP). The SFQ-RDP is implemented as a two-dimensional array of floating-point units (FPU), outputs of which can be connected to the inputs of one or more FPUs in the next row via ORN. We have considered two architectures of the ORN: one is based on NDRO switches and the...
When multiple overlay networks are constructed over the same underlying IP network, overlay paths on different overlay networks may share some links on the IP network. In general, however, because overlay networks do not recognize the existence of each other, they have no consideration on such shared physical links. In this paper, a cooperative routing method for multiple overlay networks is proposed...
In OPS networks, the contention resolution is one of the main problems. To reduce these contention events, we aim the effective use of wavelength resources with a routing and wavelength assignment method. In addition to this, the collision avoidance devices, such as wavelength converters, can improve the network performance more flexibly. The proposed method focuses on not only how to assign route...
This paper presents a novel RWA cooperation method considering retransmission in distributed optical burst switched networks. In OBS networks, it is important to retransmit bursts if collisions occurred. Our proposal treats RWA problem for both of normal bursts and retransmitted bursts. The simulation results show that this method improves the burst loss probability.
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