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TDMA based contention-free MAC protocols for vehicular ad hoc networks: A survey

机译:基于TDMA的车辆AD HOC网络的无争用MAC协议:调查

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摘要

Vehicular ad hoc network as an intelligent transportation system supports traffic management to facilitate navigation, safety, and services to end-users. Delivery of safety messages is prioritized to avoid hazards in the system. In this regard, this paper discusses the existing TDMA MAC protocols in vehicular ad hoc networks that efficiently coordinate and communicate with the vehicles and minimize the message collision. Vehicular movement and traffic density lead to link failures, collisions, and load imbalance in the network. MAC protocols with dynamic time slot synchronization, message priority, bandwidth, and frequency management techniques ensure safe message delivery, hazard prevention, and low message collision rates in VANETs. This article provides the classification of TDMA MAC protocols for distributed, centralized and hybrid protocols. Various types of collisions, two-way traffic load, multichannel utilization, and access challenges are discussed in detail. Further, the working mechanism and performance attributes of TDMA MAC protocols are explained. (C) 2020 Elsevier Inc. All rights reserved.
机译:车辆临时网络作为智能交通系统支持交通管理,以便于最终用户提供导航,安全和服务。优先提供安全信息以避免系统危害。在这方面,本文讨论了车辆临界网络中的现有TDMA MAC协议,其有效地协调和与车辆通信并最小化消息冲突。车辆运动和交通密度导致网络中的引导失败,碰撞和负载不平衡。 MAC协议具有动态时隙同步,消息优先级,带宽和频率管理技术,确保安全消息传递,防止危险和VANET中的低消息冲突速率。本文为分布式,集中式和混合协议提供TDMA MAC协议的分类。详细讨论了各种类型的碰撞,双向业务负荷,多通道利用和访问挑战。此外,解释了TDMA MAC协议的工作机制和性能属性。 (c)2020 Elsevier Inc.保留所有权利。

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