Saving energy with QoS for vehicular communication

With the rapid growth of high data rate applications, significant amount of energy is consumed by base stations´ equipment. In order to save energy, it is better to deploy fewer base stations (BSs) or switch off as many as possible. However, this is usually attained at the expense of quality of service (QoS). In this paper, we deploy fewer BSs to reduce energy consumption and study the performance of two routing protocols using our vehicular city simulator to fulfil the QoS. While working in the ad hoc mode, we illustrate that it is important to put the maximum number of vehicular nodes into sleeping mode to save energy. To achieve this, we propose a new clustering scheme where only cluster heads (CHs) can perform out of range communication. Our simulation results prove that we can save up to 2 times the energy compared to the fully operational vehicle-to-roadside (V2R) scenario and up to 9 times compared to other routing scheme while achieving an acceptable QoS.