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In Wireless-Optical Broadband Access Network (WOBAN), the Wireless Mesh Network (WMN) at front-end is self-healing, because its mesh topology can provide alternative routes. However, the Passive Optical Network (PON) at back-end has the tree topology, thus it cannot survive the failures of network components such as Optical Line Terminal (OLT) and Optical Network Unit (ONU). In this paper, the authors focus on the survivability of WOBAN against the single OLT failure and single ONU failure in the back-end PON. To tolerate single OLT failure, they deploy the backup fibers between different segments with the objective of Maximum Protection and Minimum Deployment Cost (i.e., the MPMDC problem).
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