Toshiyuki Odaka

Dynamic-load-balancing algorithm suppressing the number of wavelength reallocations for λ-tunable WDM/TDM-PON

We propose a dynamic-load-balancing algorithm that is derived using Jains fairness index. Simulation results show that the proposed algorithm can distribute traffic loads among PON-branches quite fairly with a very small number of wavelength reallocations compared with a round-robin approach.

AirSenseWare: Sensor-network Middleware for Information Sharing

AirSenseWare, a sensor-network middleware that provides abstraction models to user applications is described. The abstract modeling and its event-delivering mechanism let a user handle the real world model, instead of a sensor node itself, and hide its unexpected dynamic behaviour such as node adding, removing, and position changes. These abstraction models are shareable, which leads the cooperative construction of the real world model. AirSenseWare also serves the application independent maintenance services that lead the easy maintenance for large-scale sensor network infrastructure.

Wavelength switching method combined with downstream queue monitoring per ONU for λ-tunable WDM/TDM-PON

We propose a wavelength switching method combined with queue status monitoring per ONU to improve latency of λ-switching ONU while frame loss is prevented for λ-tunable WDM/TDM-PON. Latency degradation by λ-switching of less than 4.1 ms was achieved.