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ENERGYMINIMIZATION-BASED CROSS-LAYER DESIGN IN WIRELESS NETWORKS

In this paper, a cross-layer optimization framework is proposed for multi-hop time division multiple access (TDMA) networks. Particularly, given a set of qualityof-service (QoS) constraints on the network flows, we study a centralized controller that coordinates the routing process, link scheduling and power control to minimize the energy consumption in the network. The aforementioned design can be formulated as a mixed integerlinear program (MILP) in which finding optimal solution is well-known to have worst case exponential complexity. Realizing this inherent difficulty in computational complexity, our main contribution is to propose a novel approach to solve the cross-layer design problem which is based on a so-called Difference of Convex functions Algorithm (DCA). The proposed approach is able to provide either optimal or near-optimal solutions with finite convergence. The preliminary numerical results demonstrate the effectiveness of the proposed design.