Cluster-Based Protection for Survivable Fiber-Wireless Access Networks

Backup fibre deployment algorithm based on daily traffic demand in fibre‐wireless (FiWi) access networks

“…On the backup infrastructure deployment, related works are shown in [26][27][28][29][30][31][32]. In [26], the wireless routers were equipped with backup radio to guarantee that each primary WONU had at least one backup wireless path to each of its backup WONU.…”

“…In [30], the genetic algorithm was used to cluster all the segments and the backtracking method was applied to find the shortest Hamiltonian path in each cluster to reduce the cost of backup fibres. To deal with simultaneous failures of multiple segments, the segments were partitioned into several clusters where resources in each cluster could be shared [31]. An auxiliary graph-based protection algorithm was proposed in [32].…”

“…In summary, the above-mentioned mechanisms [22][23][24][25][26][27][28][29][30][31][32] are proposed under the assumption that the traffic demand and residual capacity of each segment are fixed. However, the traffic demand of a failed segment and the residual resources of the assisting segments, are both time-varying in terms of the human's daily life [33].…”

“…The WONU connected to a backup fibre is called as the backup WONU. According to the existing research works [25][26][27][28][29][30][31][32], the backup fibre is constructed between two WONUs located in two different segments. When a segment fails, all the traffic therein is transferred to the backup WONU of such failed segment through which the traffic is further delivered to the backup WONU of the working segment via backup fibre.…”

“…Therefore, if a backup fibre is deployed between two RNs, the fault-free network components in the failed segment can still be utilised even though the FF of such segment fails. Compared to existing schemes [25][26][27][28][29][30][31][32], this deployment method can break through the capacity bottleneck at the WONUs and prevent network congestion effectively. Thus, the recovery delay of interrupted traffic can be reduced significantly.…”