Abstract
Since the basic objective of all communication systems is to provide a high-quality performance, the development of effective retransmission schemes with incremental redundancy has gained significant importance recently. In this regard, two retransmission mechanisms had been addressed the hybrid-automatic repeat request (HARQ) and the new smart hybrid-automatic repeat request (SHARQ); thus, SHARQ is integrated with an autonomous retransmission method, ensuring the transmission of a data packet regardless to the successful decoding of the packet at the receivers. That is to say, in order to make sure of having a maximum spectral efficiency, this mechanism determines the required optimal number of autonomous retransmissions. In other words, the developed system means to guarantee the benefits of the SHARQ mechanism based on the LTE-A network as well as the output improvement from the SHARQ. Furthermore, in this current research paper, according to a new proposed algorithm a comparison will provided between the most two basic newest retransmission mechanisms over the LTE-A. Thus, through the use of the OPNET Simulator 17.5, it found out that the SHARQ mechanism is much better for the system’s operation, compared to the HARQ mechanism; not to mention that it is the best choice for all multimedia services as well as the overall network performance.
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