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Due to the high cost of construction and maintenance of infrastructure, engineers and researchers have focused their investigations on wireless mesh/relay networks with lower cost and high scalability. For current wireless mesh/relay networks, the end-to-end QoS guarantee is an important functionality because the demand for real-time multimedia communications has recently been increasing. Therefore, We propose an adaptive end-to-end delay assurance algorithm with the differentiated services architecture of hybrid mesh/relay networks with IEEE 802.16 and IEEE 802.11e to support a QoS guarantee for the mesh/relay networks. By simulating the mesh/relay networks using OPNET Modeler and analyzing the traffic of applications with different QoS requirements, we show that the proposed algorithm with the differentiated services architecture provides excellent end-to-end QoS support.