It will depend on the scenario. However, you can think of reducing the handover overhead and keep it to minimum. In other words, you can perform a base authentication, and then at handover process, there should be only a portion of all that process.

Thanks Mr Rasheed and Professor  Ghadi.

The scope my research is to optimise the pairhand authentication protocol for Mobile Ad Hoc network (MANET). I went through some papers but still needed someone that can  point me in the right direction.

Thanks for your time.