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Conference Paper


TCP Performance over Geo-routing for High Mobile Ad Hoc Networks


TCP performs poorly in mobile ad hoc networks, mainly because of route breakage. Geo-routing is a routing approach which has recently received at- tention in large scale, mobile systems as it does not require end-to-end path es- tablishment and pre-computed packet forwarding routing structure at nodes. For these reasons, Geo-routing is robust to highly dynamic route changes. For best per- formance, however, several parameters must be carefully tuned (eg, hello message exchange rate, delay timer in TCP for out-of-order delivery, etc). In this paper we study the impact of these parameters on the performance of both UDP and TCP. To improve hello efficiency in Geo-routing, we propose an adaptive hello exchange scheme based on node mobility. Then, we fix the out-of-order problem in TCP by using a receiver-side out-of-order detection and delayed ack strategy by properly calibrating the parameters. We show that these parameter adjustments are critical for TCP over Geo-routing performance in high mobile applications. With these en- hancements TCP over Geo-routing easily outperforms TCP over traditional ad hoc routing schemes, such as AODV.

Paper: PDF file of paper

Information & Date

IFIP 19th World Computer Congress, TC-6, IFIP Interactive Conference on Ad-Hoc, , January. 2006


Jiwei Chen
Mario Gerla
Yeng-Zhong Lee