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Advanced Middleware Support on Wireless Sensor Nodes

State of the art solutions employ gateways for protocol translation between wireless sensor networks (WSNs) and IT systems, which results in significant management overhead for WSN deployments. In this paper, we investigate the feasibility of IT middleware support on the sensor node itself to eliminate the need for gateways. A major challenge in this respect is the storage of relatively large network messages inside a sensor node, which might easily exceed the available resources. This turns the efficient utilization of memory into the key requirement for middleware support on sensor nodes. In order to cope with this, we derive and analyze a generic layer model for protocol processing and inspect implications on the memory requirements for each layer. Cross layer optimization is employed to gradually develop an architecture in which application relevant information is directly extracted from network packets, which drastically minimizes the overall memory consumption. We finally present the first implementation of a Universal Plug and Play (UPnP) protocol stack for sensor nodes. Measurements confirm the feasibility of UPnP support for even highly restricted nodes and suggest that support for more complex protocols is possible. Author Keywords WSN, Middleware, SOA, UPnP