Cascaded Packet Transfer Schemes to Improve Wireless T-MPLS Network Bandwidth Efficiency

Transport MPLS (T-MPLS) is regarded as one of the most important transport technologies in the next generation network (NGN). It is a connection-oriented packet transport technology that developed from MPLS techniques and now defined by ITU-T SG13 & SG15. In this paper, we analyze the architecture of the T-MPLS networks. Also the most important building blocks for the modular design of the common wireless T-MPLS equipment are introduced. And based on the functional blocks, a four-layer simulation T-MPLS model is developed. A cascaded packet transfer scheme is proposed to save transport bandwidth and improve network utilization. Simulation environment is introduced. Many kinds of research can be done using this T-MPLS simulation tool, such as the research of the feasibility T-MPLS design, the inter-working between the TMPLS and the PWE. This paper is organized as follows: the first part gives an overview on the background of the T-MPLS and other packet transport technologies. Based on the architecture proposed in the new draft of ITU-T recommendation G.8110.1/Y.1370.1, part two investigates a logical protocol layering model and the structure of T-MPLS equipment The research also covers the common interfaces such as the interface between the same kind of components of different network nodes, the interface between the internal node modules, and the interface between the T-MPLS network node and the client node. Furthermore, the equipment elements functions are explained. Also introduces a T-MPLS simulation tool developed using OPNET modeler 11.5. We proposed a simulation node structure including four layers, i.e. client layer, adaptation layer, control layer and the switching & forwarding layer. All the L2 (PDH, SONET/SDH, ETH, FR, ATM, etc) and L3 (IP) payload could be mapped into T-MPLS tunnel through either MPLS encapsulated method or pseudo wire mechanism. The proposed node structure is composed of routing controller, connection controller, service adapter, transceivers, switching element and forwarding element, etc. The cascaded packet transfer scheme functions in the T-MPLS adaptation layer (TAL) which is suitable for large amount trivial packet transport.