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In IEEE 802.11 based wireless networks adding more access points does notalways guarantee an increase of network capacity. In some cases, additionalaccess points may contribute to degrade the aggregated network throughput asmore interference is introduced.  This paper characterizes the power interference in CSMA/CA based networksconsisting of nodes using directional antenna. The severity of the interferenceis quantized via an improved form of the Attacking Case metric as the originalform of this metric was developed for nodes using omnidirectional antenna.  The proposed metric is attractive because it considers nodes usingdirectional or omnidirectional antenna, and it enables the quantization ofinterference in wireless networks using multiple transmission power schemes.The improved Attacking Case metric is useful to study the aggregated throughputof IEEE 802.11 based networks; reducing Attacking Case probably results in anincrease of aggregated throughput. This reduction can be implemented usingstrategies such as directional antenna, transmit power control, or both.

Power Interference Modeling for CSMA/CA based Networks using Directional Antenna