Mobile Management Method for SDN-based Wireless Networks

Abstract

The present Software-Defined Network (SDN) can cause the exchange of the SDN information and the action of the reconfigured by the routed rules during the handovers of the UE so that the procedure of switching the AP can in- crease the extra delay. The degree of the delay caused by the action depends on the scale of a network and network condi- tions at that moment, which could be more than 1000 mini-seconds. Therefore, the service quality can be degraded. In or- der to reduce the influence of the switching delay by the SDN information, this paper proposes a mobility control method for SDN-based wireless networks, whose concepts of the zone and the pre-configured routing rules are utilized in the pro- posed method to enable the function of routing the up-link packets. In addition, an on-line trigger design is proposed to proactively trigger a SDN information to the SDN controller so that the down-link routed routing can be updated. After the SDN controller receives the information, each AP and the routed rules are just required to be adjusted without re- configuring the routed rules so that the time of re-configuring can be reduced. The above two designs can reduce the delay of switching the AP affected by the SDN information and accelerate the handover of the UE.