Dimensioning Handover Buffers in Wireless ATM Networks with GSPN Models
ICATPN '98 Proceedings of the 19th International Conference on Application and Theory of Petri Nets
Local and global handovers based on in-band signaling in wireless ATM networks
ACM SIGMOBILE Mobile Computing and Communications Review
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Supporting mobility in ATM-based broadband networks with wireless access links poses many technical challenges. One of the most important of these challenges is the need to reroute on-going connections to/from mobile users as these users move among base-stations. Connection rerouting schemes must exhibit low handoff latency, maintain efficient routes, and limit disruption to continuous media traffic while minimizing updates to the network switches. In this paper we propose, implement, and experimentally and analytically evaluate the performance of five different connection rerouting schemes. We show that one of these schemes executes extremely fast handoffs (with a measured handoff latency of 6.5 milliseconds) while maintaining efficient routes across multiple handoffs. The scheme also results in negligible disruption to both audio (e.g., a 1-in-100 chance of packet loss at CD-quality audio rates of 128kb/s) and low bit rate video (e.g., a 2-in-100 chance of packet loss for 1Mb/s video) traffic during connection rerouting. We further analytically determine the update rates in the network switches in a wide-area setting and illustrate the use of a tuneable parameter for reducing the updates at the switches. Based on these results, we conclude that simple handoff schemes coupled with intelligent connection management are sufficient for supporting continuous media applications over ATM-based wireless networks.