Self-adaptive media access control (MAC) protocol for vehicle-mounted wireless self-organized network
A self-organizing network and vehicle-mounted wireless technology, applied in wireless communication, electrical components, etc., can solve the problems that control channels and service channels cannot be fully utilized, cannot meet the dynamic changes of VANET node density and topology structure, and achieve reliable transmission Effect
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[0028] A new adaptive MAC protocol for vehicular wireless ad hoc networks, denoted as AVCI-MAC (Adaptive Variable CCH Interval-MAC) protocol, including: DR-ALOHA (Dynamic Reservation-ALOHA) protocol used by the control channel, and node dynamic Choose the strategy for accessing the service channel in the competition mode or in the reservation mode.
[0029] The protocol framework of AVCI-MAC is as follows figure 1 As shown, the channel time is periodized, and each period is divided into CCH time slot and SCH time slot. Business information not related to security. And the CCH time slot is further divided into safety time slot (Safety Interval, SA) and WAVE service announcement time slot (WSA Interval), AVCI-MAC protocol will reserve enough safety time slots according to the current network conditions to transmit safety information , announce the WAVE service by broadcasting at WSA Interval. At the same time, the AVCI-MAC protocol will monitor the channel utilization rate o...
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