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In order to guarantee the QoS (Quality of Service) for current or future multimedia application services over wireless networks, we have proposed a cross-layer design framework which is jointly optimized among physical, data link, and network layers. In our proposed scheme, we classify the various application services into two QoS classes, i.e., streaming and downloading types of data transmissions. This paper focuses on a frame fragmentation method in data link layer to improve both latency and throughput performances in network layer. The proposed scheme properly controls the packet length based on the QoS classes as well as CSI (Channel State Information). The computer simulations reveal that our proposed scheme improves latency and throughput performances by 8.52-10.5 dB and 12.4-12.7%, respectively.