Performance Evaluation of a Mobile QoS Adaptation Strategy for Wireless ATM Networks

Wireless ATM Networks George Lin IBM Global Services San Francisco, CA 94105 [email protected] C-K. Toh School of Electrical & Computer Engg. Georgia Insitute of Technology [email protected] Abstract In this paper, we introduce an end-to-end QoS adaptation framework to resolve QoS inconsistencies as a result of mobile hando s in Wireless ATM (WATM) networks. We dene mobile QoS (M-QoS) to comprise of wired, wireless and hando QoS parameters. We introduce two forms of adaptation, namely: (a) application and (b) network QoS adaptation. The former is concerned with bandwidth, delay variation and packet loss adaptation by the mobile application while the latter refers to M-QoS ful llment, upgrade and downgrade. New procedures are de ned for MQoS upgrade and downgrade, so that QoS `refresh' tra c is controlled and the overall time required to perform a hando remains largely una ected. Results obtained from a call-level mobile network simulator further con rms the advantages of the proposed QoS adaptation scheme.