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Most of the wireless ad hoc networks have battery-powered nodes, so the life of the network depends on the power of the nodes. Power conservation is one of the main issues of wireless ad hoc networks. Power conservation can be achieved in two different ways: power control algorithms and power management algorithms. Transmission power control is one example of a cross-layer design problem. The purpose of this chapter is to discuss transmission power control problems and one possible solution by using cross layer framework through a case study. This chapter describes two cross-layer power control protocols developed at two different layers and also presents the effect of applying the combination of these protocols through a simulation study using Glomosim.