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This article presents an approach towards aggregating bandwidths of multiple physical layers i.e. transmitting and receiving data simultaneously through the multiple physical interfaces of a fixed computing system. The data over physical layers can communicate over both wired and wireless communication medium at the same time. This proposed bandwidth-aggregation-system (BWA) enhances the download and upload data transmission rates of the application and hence the QoS (quality of service). It resides in the application layer and does not deal with any interaction/modification in the physical and data link layer modules of the interfaces. Numerical results confirm that the enhancement of bandwidth is directly proportional to the summation of data transmission capacity of the physical interfaces and also proportional to the number of physical interfaces having same data transmission capacity. The same concept can be extended to achieve adaptive QoS based on a cross layer communication model.