Transmitting large packets over wireless networks helps to reduce header overhead, but may have adverse effect on loss rate due to corruptions in a radio link. Packet loss in lower layers, however, is typically hidden from the upper protocol layers by link or MAC layer protocols. For this reason, errors in the physical layer are observed by the application as higher variance in end-to-end delay rather than increased packet loss rate. This paper studies the effect of packet size on loss rate and delay characteristics in a wireless real-time application. Analytical model is derived for the dependency between packet length and delay characteristics. The theoretical analysis is validated through experiments in an ad hoc network using WLAN technologies.
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