Resource utilization protocol for static demands in WDM optical networks

摘要

Resource provisioning is one of the major problems in optical communication networks. With the increase in number of users, the demand for high bandwidth is growing enormously which results in shortage of resources. So it is important to provide the resources efficiently. Generally there are two types of traffic demands which are static and dynamic. Both the set-up time as well as the tear-down time of demands is known earlier in static demands. In dynamic, lightpath is established for each demand as soon as it arrives only for definite amount of time. For efficient provisioning of resources, many different schemes have been developed by researchers. In optical networks, scheduled traffic due to multimedia and multi-vendor applications is reproducing day by day. During working hours, the scheduled traffic is huge and sluggish during rest of the time which leads to the blocking of requests during working hours. To overcome the above issues, different schemes like Earliest set-up demand first (ESDF) and Earliest tear-down demand first (ETDF) have been developed. These schemes have few limitations like consumption of resources in ESDF and more delay in ETDF process. To resolve the complications of the existing policies, we proposed Resource Utilization protocol wherein the capacity of the wavelength and the data rate of each demand will be considered. The demand with high data rate (almost equal to the capacity of the wavelength of the fiber) will be processed directly and the demand with the lower data rate will be groomed with the existing low data rate demands. This leads in serving more number of demands. From the results, we monitored that the new protocol outperforms the existing schemes with Resource utilization ratio (RUR), number of requests served and proper usage of bandwidth.