Joint Routing and Spectrum Allocation for Multi-hopInter-Vehicle Communication in Cognitive Radio Networks

摘要

In multi-hop inter-vehicle communications(MHIVC) for cognitive radio (CR), high mobility of vehiclescauses the situation change of the primary user (PU) near thesecondary user (SU) and changes a link distance in a shorttime. In this paper, in order to overcome these problems, wepropose a joint routing and spectrum allocation utilizing thePU information (e.g., position, channel, and transmit power)and vehicle mobility information (e.g., position, direction, andspeed) to predict the end-to-end delay time for sending requiredpackets. By using PU information, we predict a periodof SU’s available frequency according to SU’s mobility. Byusing SU’s mobility information, we predict the availabletransmission data rate of each frequency. The proposed jointrouting and spectrum allocation is more likely to establishminimum delay time multi-hop paths for VANET. By usingcomputer simulations, we confirm the effectiveness of theproposed method in terms of end-to-end delay time.