1,098 research outputs found
Analytical Models of the Performance of C-V2X Mode 4 Vehicular Communications
The C-V2X or LTE-V standard has been designed to support V2X (Vehicle to
Everything) communications. The standard is an evolution of LTE, and it has
been published by the 3GPP in Release 14. This new standard introduces the
C-V2X or LTE-V Mode 4 that is specifically designed for V2V communications
using the PC5 sidelink interface without any cellular infrastructure support.
In Mode 4, vehicles autonomously select and manage their radio resources. Mode
4 is highly relevant since V2V safety applications cannot depend on the
availability of infrastructure-based cellular coverage. This paper presents the
first analytical models of the communication performance of C-V2X or LTE-V Mode
4. In particular, the paper presents analytical models for the average PDR
(Packet Delivery Ratio) as a function of the distance between transmitter and
receiver, and for the four different types of transmission errors that can be
encountered in C-V2X Mode 4. The models are validated for a wide range of
transmission parameters and traffic densities. To this aim, this study compares
the results obtained with the analytical models to those obtained with a C-V2X
Mode 4 simulator implemented over Veins
V2X Meets NOMA: Non-Orthogonal Multiple Access for 5G Enabled Vehicular Networks
Benefited from the widely deployed infrastructure, the LTE network has
recently been considered as a promising candidate to support the
vehicle-to-everything (V2X) services. However, with a massive number of devices
accessing the V2X network in the future, the conventional OFDM-based LTE
network faces the congestion issues due to its low efficiency of orthogonal
access, resulting in significant access delay and posing a great challenge
especially to safety-critical applications. The non-orthogonal multiple access
(NOMA) technique has been well recognized as an effective solution for the
future 5G cellular networks to provide broadband communications and massive
connectivity. In this article, we investigate the applicability of NOMA in
supporting cellular V2X services to achieve low latency and high reliability.
Starting with a basic V2X unicast system, a novel NOMA-based scheme is proposed
to tackle the technical hurdles in designing high spectral efficient scheduling
and resource allocation schemes in the ultra dense topology. We then extend it
to a more general V2X broadcasting system. Other NOMA-based extended V2X
applications and some open issues are also discussed.Comment: Accepted by IEEE Wireless Communications Magazin
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