SDRA: A Service Discovery Relocation Algorithm for Multiple Mobile Directories in Wireless Sensor Networks
چکیده
As the number and capability of wireless devices increases, there will be a variety of different services available in wireless sensor networks (WSNs). The services may be physical sensors (e.g. light, temperature and motion), actuators (e.g. robotic arms, switches, conveyor belts), or software (e.g. data processing and conversions). Service discovery is a mechanism which allows the nodes to automatically locate other nodes that offer software and hardware services. With service discovery in a WSN, nodes do not need to be pre-configured to access particular servers; they can self-configure to find the best service on-demand. This is valuable in WSNs as such networks can be highly dynamic (due to node failure and mobility). Many protocols and algorithms have been developed for service discovery in wired and wireless networks [1]. The resource constrained environment of WSNs has led to proposals for directory-based service discovery architectures [2]. Nodes with services to offer advertise to a central directory; nodes in search of a service query the directory. (The alternative of not using directories can lead to significant communication overhead due to excessive broadcasting [3, 4]). The challenges in using directory-based service discovery in WSNs include: SDRA: A Service Discovery Relocation Algorithm for Multiple Mobile Directories in Wireless Sensor Networks