Abstract
For cellular-based vehicle-to-everything (C-V2X) communication, vital information about status and intention is periodically broadcasted by each vehicle using the cooperative awareness message (CAM) service. In C-V2X, the task of resource allocation can either be carried out in a centralized manner by the network, termed Mode 3, or by the vehicles themselves in a distributed manner without any core network support, termed Mode 4. Mode 4 scheduling is accomplished by employing sensing-based semi-persistent scheduling (SB-SPS), where the vehicles sense the medium and identify the best time-frequency resource combination for transmission of the CAM. Focusing on Mode 4 in this paper, we present a comprehensive analysis of the impact of variations in the transmit power of the vehicle on the performance of SB-SPS for C-V2X communications in various traffic scenarios through simulations. An adaptive-transmit power control (A-TPC) algorithm is presented to improve the quality of service for various large-scale traffic scenarios, where each vehicle uses real-time channel-sensing information to adjust the transmit power in order to avoid interference with neighbouring vehicles. The results demonstrate that our proposed algorithm outperforms the conventional TPC schemes.
Highlights
To transform the future automotive industry, extensive research is being conducted on cellular-based vehicle-to-everything (C-V2X) communications to support various services such as autonomous driving, road safety, and accident reduction, leading to the prevention of accidents and providing more efficient traffic management [1]
Mode 4 in this paper, we present a comprehensive analysis of the impact of variations in the transmit power of the vehicle on the performance of sensing-based semi-persistent scheduling (SB-SPS) for C-V2X communications in various traffic scenarios through simulations
The performance evaluation for the three transmit power control (TPC) schemes is presented for the three realistic traffic scenarios, starting with the 3rd generation partnership project (3GPP) standard Mode 4 at PTX = 23 dBm, followed by ETSI Intelligent Transport Systems (ITS) recommendation for Mode 4 at PTX = 10 dBm, and the proposed adaptive-transmit power control (A-TPC) algorithm
Summary
To transform the future automotive industry, extensive research is being conducted on cellular-based vehicle-to-everything (C-V2X) communications to support various services such as autonomous driving, road safety, and accident reduction, leading to the prevention of accidents and providing more efficient traffic management [1]. Proximity services for device-to-device (D2D) communication listed in the 3rd generation partnership project (3GPP) Release 12 enable UEs to exchange data over short distances by establishing a direct link between the devices. Using this approach, long term evolution (LTE) traffic at the eNodeB can be efficiently offloaded [3]. For such short-range D2D communications, two modes, namely Modes 1 and 2, have been defined by the 3GPP specifications
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