| 摘要(英) |
With the evolution of technology, people′s lives are becoming more and more inseparable from the convenience brought by technology. In recent years, research has gradually led to the trend of technology related to the vehicle network, which plays an important role in the vehicle network is the communication between the vehicle and
everything. V2X has been used to denote the Vehicle-to-Everything (V2X) communication technology, which includes Vehicle-to-Vehicle communication (V2V), Vehicle-to-Infrastructure communication (V2I), Vehicle-to-Pedestrian communication (V2P), and Vehicle-to-Network communication (V2N) and other communication scenarios.
Cellular-V2X (C-V2X) communication plays a critical role in autonomous driving technology, which is used to support direct vehicle interaction over a Sidelink interface.
In the autonomous mode of C-V2X (also known as mode 2), vehicles can operate in a completely distributed manner without the support of base stations. They can select sidelink wireless resources based on their own needs and environmental conditions through Sensing-Based Semi-Persistent Scheduling (SB-SPS). However, in NR-V2X mode 2, this fully decentralized and sensing-based scheduling cannot be perfect, and thus resource collisions in resource reservation are unavoidable. The Decentralized Environmental Notification Message (DENM) and Cooperative Awareness Message (CAM) transmitted in Sidelink are also subject to resource collisions. In particular, DENM are event-based messages, so they may collision with CAM that are transmitted periodically. In order to solve this resource collision situation, C-V2X communication technology usually adjusts the resources by changing them frequently, however, this way may lead to resource collision, which will reduce the reliability and performance of C-V2X communication.
In this thesis, three changes are made to increase the reliability and performance of CAM and DENM respectively, and different parameters are set to compare their
performance under different traffic loads. According to the simulation results, it can be observed that when the DENM initiation rate is 0.3, the method proposed in this thesis
shows approximately a 28% improvement in CAM performance and about an 88% improvement in DENM performance compared to traditional methods. |
| 參考文獻 |
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