MAC-DBA based new cost-efficient architectures of network congestion-aware and survivable fiber-wireless and FTTx networks

Abstract

In this paper, we propose two novel architectures for the short-reach optical access network (SR-OAN) and long-reach optical access network (LR-OAN) to provide high bandwidth and high connection availability to the users in wireless and fiber-to-the-x networks. The proposed architectures are referred to as network congestion alleviating architecture with partial protection (NCAA-PP) and network congestion alleviating architecture with full protection (NCAA-FP). Both the proposed NCAA-PP and NCAA-FP architectures utilize the idle backup optical line terminals and dark fibers efficiently to develop the integrated mechanisms for alleviating network congestion and providing protection against failures of the optical resources in the network. We also propose a dynamic bandwidth allocation scheme, referred to as a surplus bandwidth allocation scheme, at medium access control layer to allocate surplus bandwidths to the users in the SR-OAN and LR-OAN during the network congestion periods. For the practical network scenarios, the simulation and analytical outcomes reveal that the proposed NCAA-PP and NCAA-FP architectures can reduce up to 82% average packet delay during the network congestion periods. Moreover, the proposed architectures offer high connection availabilities to the users and are very cost-efficient.