Abstract
For deep space networks, the major challenge is that transmission paths have to be built among long-haul links. These paths demand considerable transmission power. Since all nodes' energy is limited, it is essential to choose paths with low power costs. For reducing power consumption, we explore joint relay node selection and dynamic power control. First, we build up the routing cost function and the state dynamics. Then, a non-cooperative differential game model for power control is established. Based on the game equilibrium, we propose a joint power control and routing strategy, which selects the path with the minimum total transmission power. In addition, a routing algorithm of polynomial time complexity is devised for the optimal path search. The numerical results demonstrate that our routing algorithm can save power up to 48% compared to the previous solution and to 84% compared to the shortest path routing algorithm.
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