Abstract
Survivability is one of the key issues in hybrid wireless-optical
broadband access networks (WOBAN) since the single segment failure can cause
huge data loss. The single segment failure refers to a scenario where all
optical-network-units (ONUs) are disconnected with the optical line terminal
(OLT). Previous schemes focus on protecting WOBAN against single segment failure
by deploying backup fibers. However, previous schemes suffer from two key
problems. First, they ignore optimizing the selection of backup ONUs, which
determines the cost of recovering the traffic interrupted by the failure.
Second, they underutilize the residual capacity of segments, thus requiring
higher backup fibers cost. In this paper, we propose a new and efficient scheme,
called Optimizing Backup ONUs selection and backup Fibers deployment (OBOF),
to enhance the survivability of WOBAN against the single segment failure.
Our OBOF is composed of two consecutive steps, backup ONUs selection and backup
fibers deployment. In the first step, aiming to minimize the cost of recovering
the traffic interrupted by the failure, the simulated annealing (SA) algorithm
is customized to optimize the selection of backup ONUs. In the second step,
most importantly, an enhanced greedy cost-efficiency (EGCE) algorithm is proposed
to optimize the deployment of backup fibers. Our EGCE consists of a novel
remote backup segment (RBS) method, which can efficiently utilize the residual
capacity of the segments, and a Bound on Length of Backup-optical-path (BLB)
method, which limits the increase in recovery time induced by RBS. Extensive
experimental results demonstrate that our OBOF scheme outperforms the previous
schemes significantly, especially in the scenario of higher
traffic demand.
© 2012 IEEE
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