Priority and Buffer Based Admission Control in Relay-enhanced LTE-A systems

Abstract:
Relay Nodes (RNs) introduction is one of the main features of LTE-Advanced (LTE-A) with the aim of enhancing network coverage and capacity at cell-edge. However, a proper admission control scheme is required to increase the total number of admitted users in the system. This work proposes the implementation and evaluation of three types of admission control schemes taking into account the optimal resource partitioning between RNs and DeNB. The first scheme bases the admission and rejection of users on the resources’ availability. The second scheme adds an admission control algorithm based on users’ priorities. Finally, the third scheme introduces a dynamic buffer in order to utilize the free resources during the empty arrival periods and to further improve the performance. Performance analysis of the proposed admission control algorithms for different download bit rates and file size is performed through simulations. The optimal buffer configuration that minimizes the probability of unhappy users is determined. Keywords — Relay; LTE-Advanced; Admission Control; Relay Node.