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OLSR-FastSync: Fast Post-Handoff Route Discovery in Wireless Mesh Networks

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1 Author(s)
Speicher, S. ; Inf. & Commun. Services Group, Rostock Univ., Rostock

Wireless mesh networks (WMNs) are a promising networking concept to extend the range of wireless gateways by leveraging fixed relays as packet forwarders for nodes further away. WMNs use ad-hoc routing protocols such as AODV or OLSR to route packets between wireless gateways, fixed relays, and mobile nodes (MNs). This paper focuses on handoff-related delays specific to WMNs: delays due to re-discovery and setup of multihop routes after handoffs. Since in case of OLSR routing information is only sent periodically to reduce routing overhead, route discovery can take up to a few seconds, which is far too long for delay-sensitive applications like Voice over IP. Therefore, we propose the FastSync extension for OLSR, which enables MNs to obtain all topology and gateway information immediately after handoff from a fixed relay of the handoff-target WMN. As a result, the long waiting phase for the first regular routing update after handoff is avoided. We implemented our concept and performed extensive simulations. The results show that OLSR-FastSync reduces handoff-related route setup delays significantly.

Published in:

Vehicular Technology Conference, 2006. VTC-2006 Fall. 2006 IEEE 64th

Date of Conference:

25-28 Sept. 2006

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