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Handoff in Hybrid Mobile Data Networks. Vijay Dadlani. Types of Handoffs. Handoff in Cellular Telephony. Handoff in Wireless Networks. Handoff in Hybrid Networks. The Ping-Pong Effect. Takes a severe toll on the user’s quality reception and the network load.
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Handoff in Hybrid Mobile Data Networks Vijay Dadlani.
Types of Handoffs • Handoff in Cellular Telephony. • Handoff in Wireless Networks. • Handoff in Hybrid Networks.
The Ping-Pong Effect • Takes a severe toll on the user’s quality reception and the network load. • Persist with a BS for as long as possible.
Active scanning Vs Passive scanning • Passive scanning – mobile host simply listens to available beacons. • Active scanning – mobile host sends a probe request to a targeted set of APs that are capable of receiving its probe.
Comparison of handoff procedures in voice and data mobile networks.
Horizontal Vs Vertical Handoff. • Upward vertical Vs Downward vertical handoff.
Design Considerations • The objective is to reduce major changes to existing networks esp. at lower levels. • This will ensure that existing networks will continue to function as before without requiring current users to change to the new approach.
Conclusions • Traditional Handoff algorithms have poor performance and are being replaced by emerging advanced Handoff algorithms. • No one technology can provide ubiquitous coverage, resulting in the need for HO in a Hybrid network.