Yonggang Du

A fast restoration system for ATM-ring-based LANs

The authors present a restoration algorithm designed for a ring-based multimedia ATM architecture, which is characterized by the simplicity of the node structure allowing flexible network configurations and an efficient bandwidth management. They show how easily reliable connections can be implemented within such an architecture. Basically, restoration is implemented by rerouting the protected traffic away from the failed component. The node which is located before the failed component is in charge of performing the rerouting. It requires only a few control flags of the routing table to be modified. This guarantees a fast restoration. The algorithm also allows an efficient use of the spare capacity. >

System architecture of a home wireless ATM network

Issues concerning the design of a wireless ATM (WATM) network for the home user are described. Low cost, plug-and-play, and flexibility of the system architecture form the cornerstones of this design.

A flat wireless ATM LAN architecture with distributed ATM switching in base stations

The infrastructure for cellular wireless ATM systems is normally assumed to be hierarchical with the ATM switching functionality being provided by centralised ATM switches. For easy installation of the infrastructure, a flat architecture is proposed for cellular wireless ATM LAN, which is enabled by a distributed ATM switch concept. In this concept, a smart ATM switching component is embedded into the wireless access point. The same component is used for a fixed ATM access point, too. A number of such switching components are connected in a ring topology to form the ATM backbone. A ring control protocol hides the ring-specific features from the user and assures that a standardised UNI is provided to any wireless and fixed terminal.

Wireless ATM LAN with and without infrastructure

A wireless ATM LAN framework architecture designed to support wireless ATM communications in environments with and without fixed ATM infrastructure is described. For the configuration with ATM infrastructure a distributed ATM switching backbone is proposed, which allows a smart ATM switching element to be embedded into the wireless access point. The same embedded ATM switch technique is used to realise forwarding and interworking nodes in an adhoc wireless ATM LAN which is proposed to combat the weakness of CSMA-based systems such as HIPERLAN and IEEE802.11.