The next generation of communications satellites may be designed as a fast packet-switched constellation of spacecraft able to withstand substantial bandwidth capacity fluctuation ranging from unstable weather phenomena to intentional jamming of communication. We have designed and partially implemented an architecture for managing satellite telecommunations network resources. Our approach supports advance reservations and dynamic requests, negotiation and fulfilment of prioritized Quality of Service (QoS) contracts, graceful degradation in the presence of dynamic tasks and environmental changes, and optimization of geometrically constrained resources. Our integration of planning and execution to address this task uses planning to avoid resource contentions among requested activities and to configure an independently competent execution system. Our system can be used in routine operations or as a simulation-based design tool.