Providing Fault Tolerance in Wireless Backhaul Network Design with Path Restoration
Link restoration and path restoration are the two major techniques used for telecom network restoration in DCS (Digital Cross-connect System) mesh networks. For rerouting to be possible, su cient spare capacity must exist in the links of the chosen alternate paths. Path restoration results in lower additional cost compared to link restoration. Tra c splitting can be used to further reduce the additional cost. There are several methods of performing trafc splitting. We have chosen to study even-splitting and best-splitting methods. We have evaluated tra c splitting techniques by enhancing the link and path restoration modules of the Restoration Network Planning Tool developed by Alcatel Network Systems. We have observed, through several experiments, that tra c splitting results in signi cant reduction in the spare capacity and the corresponding augmentation cost.