Cognitive radio enabled channel access for public bus network

Abstract

Public bus network plays a significant role to enable public vehicle communications and allow for the exchange of safety and other types of information. The wireless access in vehicular environments protocol has been standardized over the 5.9 GHz as dedicated short range communications spectrum. Under the wireless access in vehicular environments standard mechanism, public bus nodes are not allowed to use service channels during control channel interval. This causes half of the service channel intervals to remain idle, which makes not sufficient spectrum for reliable exchange of information in public bus network. To alleviate this problem, we propose a system that employs cognitive network principles to increase the spectrum allocated and it outperforms in channel utilization and robust delivery of data. Simulation results confirm that the proposed scheme raised the spectrum utilization by 50 % compared to the performance under the wireless access in vehicular environments standard, which improves reliability for data transmission.