Architecture of High-speed Wireless ATM Network Original author: Anna Hac University of Hawaii at Manoa Presented by Wei Wang York University

Contents Background AT&T’s solution NEC’s solution British Telecom’s solution Cambridge’s solution Conclusion

Background Design consideration:

AT&T’s solution “Distributed control” strategy Call server – Call control Connection server – Connection control Channel server Location management server

AT&T’s solution (Con’d) Cluster-based multi network configuration

AT&T’s solution (Con’d) Three type of application: Cellular phone applications Laptop data applications Multimedia-based applications Distributed algorithms Parallelism during call setup

NEC’s solution Multi-service wireless Personal Communication Network (PCN) Retaining QoS classes Providing extensions to ATM protocol Compatible with fixed ATM network 48-payload in PCN packet

NEC’s solution (Con’d)

Hierarchical architecture Each PCN node contains: ATM switch, Multiplexer,Base station and MSU VCs are divided into fixed and dynamic segments

BT’s solution 3G - UMTS (Universal Mobile Telecommunication System) Support a variety mobile functions Intelligent Network-based architecture Minimize burden caused by handoff Use IN for handoff control Increase Mobile Switching Center’s (MSC) processing capability

BT’s solution (Con’d)

Cambridge Solution Wireless ATM LAN Based on combination of hierarchical organization and distributed control and uniformity Compatibility with ATM Similar wireless ATM header

Cambridge Solution (Con’d) Handoff processing Partial re-establishment Crossover Switch (CX) Distributed handoff management Switch discovery mechanism

Conclusion Separation of connection, call and connection control Hierarchical location management Extension to existing ATM protocol stack Mobility agents are used to lessen the burden on switches Compatibility with existing ATM protocol

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