Abstract: At present, distributed wireless sensor network (DWSN) has been widely used and served in many fields, but there are still some technical and performance optimization difficulties in its network architecture and nodes, which affect the application effect. Software defined network (SDN) is a new network architecture with the programmable function of controlling and forwarding separation. It can virtualize the software definition of node devices and interlayer protocols. In order to improve the security and operability of DWSN’s key technologies and performance optimitation, and reduce the network complexity, the SDN framework is introduced into the DWSN to form a new SDN-based distributed wireless sensor network (SDDWSN) framework. Firstly, the main points of SDDWSN framework are discussed by introducing SDN necessity. Secondly, the related technology and performance optimization of SDDWSN framework are studied from the aspects of network communication, resource processing and control management. Finally, the advantages of SDDWSN are reflected by designing cases and qualitatively comparing and analyzing their security and event maneuverability.

Key words: software defined network, distributed wireless sensor networks, software defined distri- buted wireless sensor networks (SDDWSN), performance optimization, routing protocol