# Distributed Triggered Access for BSM Dissemination in 802.11 bd V2V Networks  
[PERSON]  
1 Korea Railroad Research Institute, 176, Cheoldobakmulgwan-ro, Uiwang-si, Gyeonggi-do 16106, Korea; [EMAIL_ADDRESS]  
2 Department of Railroad Electrical & Electronic Engineering, Korea National University of Transportation, 157 Cheoldobakmulgwan-ro, Uiwang-si, Gyeonggi-do 16106, Korea  
2 Correspondence: [EMAIL_ADDRESS]; Tel. : +82-31-460-0572222  
has been mainly conducted [2; 3; 4]. In terms of improving the precision of traffic management techniques, developing more realistic traffic models and advanced traffic prediction tools has also been one of the key topics [5; 6; 7; 8; 9]. The introduction of wireless communication technology has allowed much wider and more sophisticated approaches in traffic management by means of providing timely information to drivers, vehicles, and systems. Wireless Sensor Networks (WSNs), which are capable of monitoring real-time traffic using low-cost communication devices such as ZigBee and Bluetooth devices, have gain increasing attention [10; 11; 12]. Also, there has been significant research on Cooperative Intelligent Transportation Systems (C-ITS) where each component on the road bidirectionally communicates to each other taking advantage of broadband wireless communication systems [13; 14; 15], such as Dedicated Short Range Communication (DSRC) [16] and 3 rd Generation Partnership Project (3 GPP) Long Term Evolution (LTE) [17]. Lately, platooning, which combines autonomous driving and advanced communication techniques, has been spotlighted as a breakthrough technology and intensively studied [18; 19; 20; 21]. In platooning, autonomous vehicles share their driving information among neighboring vehicles, and organize themselves into a set called a platoon. Since platooning can increase the road capacity by reducing the inter-vehicle distance, it is considered one of the most promising solutions for future congestion management. To efficiently manage autonomous platoon without compromising safety aspect, cooperative awareness among platooning vehicles needs to be guaranteed. One of the most common ways to achieve the cooperative awareness is beaconing where all vehicles periodically broadcast their general information using V2V wireless communication. A beaconing message may include vehicles' positioning information and driving information such as speed, accelerating/braking force and steering, peripheral information measured by sensors attached to vehicles. SAE J2735 [22] defines the format of the Basic Safety Message (BSM) as the application of beaconing message and is widely applied for numerous vehicular networks. As a bearer of BSM messages, DSRC leveraging the IEEE 802.11p standard [23] has been mainly considered in the early stage of vehicular networks. The IEEE 802.11p standard is designed to operate in 5.850-5.925 GHz band and developed based on the IEEE 802.11a Wireless LAN PHY/MAC specification. There are couple of advantages using IEEE 802.11p standard in vehicular communications: (1) a centralized controlling entity is not required because each vehicle is allowed to access the medium in a distributed manner, (2) easy and low-cost deployment is possible since the network operates in unlicensed band, and also it does not require higher layer infrastructure. Several DSRC-related pieces of research have been conducted to evaluate the performance of DSRC. [PERSON] et al. [24] introduced the basic parameter space for one-dimensional IEEE 802.11p networks derived with the IEEE 802.11 Distributed Coordination Function (DCF) model. In [25], an analytical model for safety message broadcasting was proposed. The model took vehicles' high mobility, hidden terminal problems, the transmission collisions from neighboring vehicles, and the channel fading in DSRC networks into account.