Wireless local area networking has experienced tremendous growth in the last ten years with the proliferation of IEEE 802.11 devices. The first IEEE 802.11 Medium Access Control (MAC) technique of 802.11 is called Distributed Coordination Function (DCF. In order to enhance the throughput, new mechanism access control techniques are developed by TGn group of IEEE 802.11n. The main purpose of AFR mechanism is to retransmit only the corrupted fragment from large frame including multiple aggregated packets that leads to overhead reduction. This paper investigates a theoretical analysis of Aggregation with fragment retransmission, based on computing saturation throughput for DCF and AFR mechanisms. We provide a simple and accurate analytical model to calculate the Maximum MAC throughput to evaluate performances of AFR. We study the application of AFR on differentiated IEEE 802.11EDCA services.