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In this paper, we introduce a cross-layer, applicationoriented communication protocol for Wireless Sensor Networks (WSN). TSTP -Trustful Space-Time Protocol -integrates most services recurrently needed by WSN applications: Medium Access Control (MAC), spatial localization, geographic routing, time synchronization and security, and is tailored for geographical monitoring applications. By integrating shared data from multiple services into a single network layer, TSTP is able to eliminate replication of information across services, and achieve a very small overhead in terms of control messages. For instance, spatial localization data is shared by the MAC and routing scheme, the location estimator, and the application itself. Applicationorientation allows synergistic co-operation of services and allows TSTP to deliver functionality efficiently while eliminating the need for additional, heterogeneous software layers that usually come with an integration cost.

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