Italo Busi

Non-blocking conditions for EGS networks

A class of multistage interconnection networks, known as extended generalized shuffle (EGS) network, is here considered; it is built with arrays of elementary switching elements, interconnected by shuffle patterns, and external splitters and combiners. New results are given here that reduce the splitter fanout required to make the network strictly non-blocking.

Backhauling solutions for LTE networks

LTE and LTE advanced mobile technologies impose quite new requirements to backhauling network and may call for revolutionary approaches, like fronthauling, in order to exploit the full potential of the technology. In this paper we synthesize main requirements for LTE and LTE advanced backhauling and fronthauling, along with the underlining rationale, and describe to some extent possible different network designs, both at L1 (fronthauling) and L2 / L3 (backhauling), comparing them against those requirements.

Strict-sense non-blocking conditions for shuffle/exchange networks with vertical replication

The strict-sense non-blocking conditions of an interconnection network built by vertical replication or a Banyan network with additional stages are known only it the expanded Banyan network has a recursive construction. We consider a shuffle/exchange network as the basic building block to be replicated vertically. Since this network does not have a recursive construction, the previous analysis cannot be applied. By relying on the topological properties of the channel graph in a shuffle/exchange network, we find that the non-blocking conditions for this network an numerically the same needed for a recursive Banyan network.

Protection switching in Packet Transport Rings

Transport networks are currently evolving from traditional circuit switching technologies toward packet switching technologies. Multi Protocol Label Switching (MPLS) Transport Profile (MPLS-TP) is an emerging technology addressing the need for packet transport networks. Protection Switching in Packet Transport Rings is an important area of work in the context of MPLS-TP in order to support the packet transport reliability requirements given the widespread adoption of ring topologies in metro transport networks. This paper reviews the use cases for MPLS-TP ring protection switching, how one of the proposed mechanisms, namely MPLS-TP Ring Protection Switching (MRPS), can address these requirements and some possible enhancements to the MRPS base mechanism.

Packet Transport Technologies for Optical Networks

Abstract The purpose of a transport network is to provide a reliable aggregation and transport infrastructure for any client traffic type, in any scale, at the lowest cost per bit. With the growth of packet services, operators are transforming their network infrastructures while looking at reducing capital expenditures and maximizing operational savings. In that scope, new technologies are emerging such as transport multi-protocol label switching and provider backbone transport. This article outlines the state of the art for packet-based transport technologies, comparing them and highlighting the key factors.