| Abstract |
In an LTE-A network, the traditional AMC scheme allocates RB based on SNR/CQI table reported from UE and the data rate requirement of UE. However, this scheme will lead to allocating RB which is beyond the requirement of UE. To solve the problem, this thesis proposes a dynamic RB allocation scheme by utilizing ARQ status report in which UE reports erroneous packet with sequence number to eNodeB. From the status report, eNodeB will compute the amount of successfully received data per unit time of each UE. Therefore, eNodeB can properly allocate RB which is exactly the requirment of each UE. Moreover, in this thesis, we consider three traffic types (audio, video, and data) with different priorities. Our proposed scheme can alter the modulation determined by AMC such that the utilization of an OFDMA frame can be tremendously increased. To prevent the starvation of data traffic which has the lowest priority, we set an upper bound of occupied RB for audio and video traffic in an OFDMA frame. At last, we perform NS-3 simulation to demonstrate the superiority of the proposed scheme. The simulation results show that our proposed scheme can perform much better than the traditional AMC scheme in terms of system utilization, blocking rate of UEs, and the number of successfully connected UEs. Particularly, when in a high noise environment and a large number of UE, the proposed scheme can guarantee a smaller blocking rate for video traffic. |
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