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The 802.11p standard has been recently ratified to provide Wireless Access in Vehicular Environments (WAVE). According to the WAVE alternating channel access scheme, singleradio devices must tune into a common frequency during the Control CHannel (CCH) interval, to exchange safety and control packets, and regularly (every 50 ms) switch to one of the available Service CHannels (SCHs) for non-safety data exchange. In order to improve non-safety data delivery performance, the extended access mode has been recently proposed by the standardization groups in order to allow vehicles to stay tuned on the SCH as long as they need before switching on the CCH.
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