Reliable and fast restoration for a survivable wireless-optical broadband access network

Integration of wireless and optical access technologies for the Internet access seems as a promising solution to reduce the cost of deploying fiber to the premises. Wireless Optical Broadband Access Network (WOBAN) combines wireless mesh and optical communication technologies at the front and the back ends of the Internet access, respectively. Survivable design of both ends of WOBAN occurs as an important problem for the network operators. In this paper, we propose a restoration framework for WOBAN which is inherited from a previously proposed architecture. Our proposed scheme attempts to select optimum number of protection clusters for the WDM-PON segments at the back-end of WOBAN considering the optimum deployment of the fibers between the backup ONUs so that the restored traffic propagates with the minimum delay. Optimization results show that our proposed scheme leads to shorter fiber deployment between the ONUs which enables the failed traffic to propagate faster to the feeder fiber. Moreover, taking the advantage of the ring protection also provides the proposed scheme to cover the whole traffic in a failure-impacted WDM-PON segment.