Research Article
Priority-Based Multi-carrier Access Schemes for Safety Message Transmission in Vehicular Networks
@INPROCEEDINGS{10.1007/978-3-319-78139-6_25, author={Huichao Wang and Longjiang Li and Fan Wu and Ke Zhang and Supeng Leng}, title={Priority-Based Multi-carrier Access Schemes for Safety Message Transmission in Vehicular Networks}, proceedings={Communications and Networking. 12th International Conference, ChinaCom 2017, Xi’an, China, October 10-12, 2017, Proceedings, Part II}, proceedings_a={CHINACOM}, year={2018}, month={4}, keywords={PMRA/CS Concurrent access Conflict resolution Vehicle priority}, doi={10.1007/978-3-319-78139-6_25} }- Huichao Wang
Longjiang Li
Fan Wu
Ke Zhang
Supeng Leng
Year: 2018
Priority-Based Multi-carrier Access Schemes for Safety Message Transmission in Vehicular Networks
CHINACOM
Springer
DOI: 10.1007/978-3-319-78139-6_25
Abstract
With the explosive growth of vehicles, current vehicular networks, based on CSMA/CA, are unable to guarantee the low latency and high reliability for safety message transmission under heavy traffic condition. In this paper, we propose a Priority-based Multi-carrier Random Access with Carrier Switching (PMRA/CS) scheme, which is designed for OFDMA-based vehicular networks to support massive concurrent access of large number of vehicles. Compared to CSMA/CA, PMRA/CS utilizes a special short detecting frame to resolve the alarm message collision with less cost. Moreover, the scheme provides more opportunities for vehicles to access the channel in one period by allowing the loser of one sub-carrier to switch to another idle one and continue to access contention. Use of vehicle priority assignment makes the proposed strategy more applicable to realistic scenarios. Furthermore, we provide some theoretical analysis of the proposed scheme combined with derived formula derivation. Simulation results are provided to demonstrate the improvements of message sending success rate and average delay reduction of our proposed scheme.