Performance evaluation of an active signaling based time-slot scheduling scheme for connected vehicles

Abstract

Latency is a very important metric to be taken into account in the design of the Connected and Automated Driving (CAD) technology. Today, connected vehicles have a dedicated technology named vehicle-to-everything (V2X). Many current research efforts and standardization activities aim to make the next generation of V2X technology able to offer new usages and services, with the main focus being on supporting road safety applications: hazard, obstacle and collision avoidance, etc. To satisfy the real-time constraints of safety applications, Time Division Multiple Access (TDMA) is a widely-used technique to control and share the channel. TDMA-based Medium Access Control (MAC) protocols have resolved many issues in VANETs and shown good performances in the literature by ensuring a bounded access delay to send an emergency message. However, latency can be further improved by eradicating some imperfections in the functionality of these protocols, such as the access collision problem which can occur when two or more vehicles in the same two-hop neighborhood set try to access the same slot at the same time. That is why we recently proposed an Active Signaling-based TDMA MAC protocol, called AS-DTMAC, which operates above the existing DTMAC protocol. In this paper, we analytically study the performance of AS-DMTAC when we have a homogeneous arrival on each time slot with an error in the signaling process.

Network slicing for vehicular communications: a multi-agent deep reinforcement learning approach

“…It is designed primarily to support non-safety related traffic that is characterized by high-throughput transmissions, e.g., video streaming. On the other hand, the second slice is reserved for safety applications and is referred to as the safety slice (or slice 2), which is designed primarily for safety-related traffic that is characterized by extremely low latency requirements [16], e.g., emergency alerts and accident reports. An example of our system model is given in Fig.…”

“…Indeed, V2X communication is one of the key verticals in fifth generation (5G) networks [17,38]. In 3rd generation partnership project (3GPP) release 16, the new radio cellular-V2X (NR C-V2X) communication supports two transmission modes: a direct mode with NR C-V2X sidelink, and an over-the-cellular network mode, that together, provide seamless connectivity to vehicles through a unified radio. V2X communication enables information sharing through vehicleinfrastructure (V2I), vehicle-to-pedestrian, vehicle-to-vehicle (V2V), or vehicle-tocellular network (V2N) communication.…”

An Efficient Cross-Layer Design for Multi-hop Broadcast of Emergency Warning Messages in Vehicular Networks

“…Very many protocols are susceptible to this problem, including: ADHOC MAC [15], VeMAC [18], DTMAC [4], R-ALOHA [17]. To solve this problem, we have designed in [5] [8] [9] [10], an efficient mechanism named active signaling and we apply it in the DTMAC's random slot selection process.…”

Using visible light links in combination with radio communication in a vehicular network

“…We assume that the selection process in AS-DTMAC uses n signaling bursts. The access probability of AS-DTMAC for a transmission with a input load λ is given by the following equation [6]…”