Mpls Implementacion De Qos En Redes Inalambricas(Ingles)

QoS Implementation For MPLS Based Wireless Networks
Subramanian Vijayarangam and Subramanian Ganesan Oakland University, Rochester, Michigan Abstract : Voice has been the primary application in wireless networks to date. However, packet based applications and higher bandwidth requirements to sustain these applications are ever emerging. As in wireline packet based networks, while IP routing iswell understood, IP networking by itself is still not achieved and is dependent on the backbones that can offer quality of service gurantees. Mulitprotocol Label Switching (MPLS) is a newer technology that offers service integration, layer 2 switching and connection orientedness, that allows traffic engineering control traffic flows in the network. The purpose of this paper is to show how MPLS QoSarchitecture can be employed to provide traffic engineering in broadband wireless networks.

1 Introduction
Today’s land based networks transport voice and data traffic on predominantly separate networks, each with its own switching/routing architecture, network management platform, and support staff. With emergence of VoIP technology there is a growing trend towards the integration of voiceand video into one single network. With the imminent evolution to the next generation wireless network, wireless service providers are striving to converge these separate infrastructures to a single network over a common packet core, that will help reduce both operational expenditure (OPEX) and capital expenditure (CAPEX). One of the primary goals of this emerging wireless networks will be to enablebandwidth on demand, based on different traffic types (Conversational, Streaming, Interactive, and Background). To meet the demands of the different traffic types carried across 3G networks, service providers need to ensure that their networks are reliable, flexible, and will evolve to support the high bandwidth requirements of the future. Current 3G standards are based on Asynchronous TransferMode (ATM). ATM has been used to a large extent as a switching technology for the backbone data networks today to support integrated services with QoS control. Considerable research has been carried out to extend ATM services to mobile terminals mostly with the assumption that ATM connections terminate at the wireless users. For example, WirelessATM (WATM), extends the ATM signaling and controlframework to support mobility. On the other hand, with the widespread use of Internet protocols, many schemes have been proposed to support mobility for IP wireless terminals within a connection-oriented framework of ATM networks, as in the case of the wireline networks. However, the need to integrate the best of both IP based networking and traditional voice service like quality

ASEE Conference,April 2002, Oakland University, Michigan

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of service, has made many in the technology world rethink on ATM for both wireline and wireless networks. IP, by its very connectionless nature can’t offer quality of service, except when the networks are extremely overprovisioned. MPLS is a technology that delivers a unified control mechanism with its multiprotocol capabilities for running overmixed media infrastructures. MPLS defines signaling mechanisms to support both Class of Service (CoS) and QoS. It provides the means to relate this to the IP DiffServ markings of the originating IP traffic. Also QoS mappings to ATM also exists (if an evolution from a ATM based wireless netowork backbone is needed). MPLS's ability to support constraint-based routing and traffic engineering deliversthe QoS that is required to support Conversational, Streaming, and Interactive traffic, something only previously possible only with ATM. Hence, Multi-Protocol Label Switching (MPLS) is emerging as the technology of choice to facilitate traffic engineering and internetworking. This paper explains how the MPLS hierarchical architecture for label-switched networks can be used for supporting...