Abstract
In recent years, intelligent transportation systems, which provide safety and autonomous services on the road using the Internet and cellular technologies, have become increasingly important. Vehicles are equipped with sensors that can transmit data to other vehicles or infrastructure according to different types of services. In order to ensure robust connectivity for safety services, the transmission among vehicles requires low latency, high reliability, and high packet delivery ratio. With the increased number of vehicles, more frequency resources are needed to establish fast and reliable services. In the area of high vehicle density, the demand of frequency resources is increasing to establish stable connectivity in a short time. However, the amount of frequency resources is limited; the resource allocation scheme (RAS) should effectively assign a resource block to each user to ensure the quality of service. In this paper, we present a comprehensive survey of RASs for the 5G-based vehicular networks known as 5G V2X. We also discuss the challenges and opportunities for resource allocation in modern vehicular networks and present numerous promising future research directions.
Highlights
In recent years, the concept of vehicle-to-everything (V2X) has attracted increasing research attention in both academia and industry
We focus on the resource allocation scheme (RAS) of sidelink transmission in 3rd Generation Partnership Project (3GPP) Release 16, which is categorized into two modes: (1) mode 1, in which the base station (BS) schedules the transmission for each sidelink transmission, and (2) mode 2, in which the radio resource of the sidelink transmission is selected autonomously by selecting the radio resource from the resource pool [6]
We have reviewed RASs for 5G V2X, which consider the quality of V2X services and the network scenario
Summary
The concept of vehicle-to-everything (V2X) has attracted increasing research attention in both academia and industry. The 5GAA categorized the V2X applications into four main groups of use cases: safety, convenience, advanced driving assistance, and vulnerable road user. Depending on the ITS services, the collected data are sent to other vehicles or humans for road safety or autonomous driving. In parallel to the V2X communications presented in [1] and the V2X application use cases presented in [7], 3GPP Release 16 groups the main services of V2X into four areas according to the critical requirements of scalability, reliability, throughput, and latency [12], [15]. V2X communications require high reliability, high throughput, network scalability, and low latency.
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