In this article, we consider the capacity fairness problem in IP-over-WDM networks. Since connections with different bandwidth granularities may be established over a shared lightpath, fairness in bandwidth allocation among different users becomes a crucial problem. A simple, yet efficient hop constraint-based admission control scheme is proposed to accommodate more high-bandwidth requests. Through rejecting some of the low-capacity requests that would go through alternative paths with more hops and thus would consume a larger amount of bandwidth, the blocking probability of high-capacity requests reduces notably. Numerical results show that this proposal achieves significant improvement in capacity fairness without raising the overall blocking probability. In addition, it achieves excellent fairness performance at both light and heavy loads by selecting the rejection probability dynamically.
From both user and operator perspectives, fairness is an important aspect in IP-over-WDM networks where Label Switched Paths (LSPs) are dynamically groomed over optical networks. The setup of LSPs with long distances experiences a higher blocking probability due to both lightpath establishment unfairness in the optical layer and link cascading effect in the IP/MPLS layer. A simple LSP connection admission and fairness control mechanism is proposed in this article. This control mechanism is based on hop constraint, in which an LSP is accepted with a pre-assigned probability according to its distance and the hops of its route. Through suppressing connection of short-distance LSPs that overuse bandwidth to facilitate the setup of LSPs with long distances, this proposal achieves fine distance fairness performance with a slight overall blocking probability increment.
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