Contention resolution mechanism for QoS provisioning is considered as a significant issue in optical burst switching network. Further, optical burst switching network necessitates a mechanism for contention resolution and service differentiation for enabling support in internet traffic. In this paper, a Novel Contention Prevention Scheme-based on Delayed Reservation for QoS Enforcement (NCPS-DRE-QoS) in optical burst switching network. This NCPS-DRE-QoS approach allocates the wavelength based on the available wavelength information obtained along the forward path by means of PROBE packet in the backward reservation. Further, the information gathered by PROBE packet are outdated due to the link propagation or processing delay, since the possibility remains of request is blocked by the utility of PROBE based inspection. The performance of NCPS-DRE-QoS are exhaustively studied through ns-2 simulations with the aid of evaluation parameters such as Jitter, Packet delivery ratio, Burst loss ratio and average goodput. From the simulation results obtained, it is transparent that NCPS-DRE-QoS successfully reduces the burst loss probability when compared to the other delayed reservations based contention resolution oriented QoS provisioning mechanisms available in the literature.

Delayed Reservation, Contention Resolution, Just-in-Time Provisioning, Forward blocking , PROBE packet, Wavelength prediction table, Wavelength topology ring

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