Aiming at the low utilization of spectrum resource in vehicular networks

an algorithm base on semidefinite programming was presented

which could be utilized to channel width adaptation of multi-channel vehicular networks.Firstly

the algorithm need to measure the distance with the surrounding vehicles to compute conflict graph.And then the semidefinite programming relaxation was employed to coordinate the competition of spectrum resource.Finally

the ultimate channel width adaptation was computed based on the initial channel assignment and compression process.Simulation results demonstrated that the new algorithm not only can promote network throughput

but also perform well on extremely dynamic topology.