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In this paper, we present a fully distributed cross-layer algorithm with delay constraint in order to support real-time multimedia services in cooperative networks. The Network Utility Maximization problem is decomposed into congestion-contention control subproblem in the link layer and routing subproblem in the network layer. We design an End-to-end delay framework for modeling delay constraint in analyzing the network utility maximization problem such that Quality-of-Service (QoS) guarantees for multimedia communication is enhanced. This paper presents a step forward a systematic understanding of layering as optimization decomposition, where the overall communication network is modeled by a generalized network utility maximization problem, each layer corresponds to a decomposed subproblem. Convergence analysis and simulation indicates this algorithm can converge. The proposed algorithm can be easily generalized into other multi-hop wireless ad hoc networks.