LTE, LTE-Advanced and WiMAX: Towards IMT-Advanced Networks

Quantitative Comparison between LTE and WiMAX

In this section we present the research attempts for comparing the performance of some LTE and WiMAX functionalities in the same experimental setup. We present works addressed the performance evaluation of the VoIP scheduling in WiMAX and LTE, the power consumption of the WiMAX and LTE BS and the access methods used in both technologies, the OFDMA in WiMAX and the SC-FDMA in LTE.

VoIP Scheduling in LTE and WiMAX

The work in [25] studies the performance of VoIP scheduling for TDD-LTE and IEEE 802.16m. The work compares the two technologies performance schedulers in serving VoIP applications. The semi-persistent schedulers are only defined by LTE. They are useful in serving the delay-intolerant VoIP traffic, since the semi-persistent schedulers reduce the amount of control signaling while maintaining an acceptable level of output quality. The study implements the semi-persistent schedulers for VoIP packets initial transmission and a dynamic scheduler for serving the VoIP packets retransmissions. The authors concluded that the IEEE802.16m persistent scheduler has higher capacity than that of LTE-TDD in the uplink, because LTE-TDD implements SC-FDMA RB allocation in the uplink, hence, LTE-TDD is required to implement sort of inter-cell interference coordination algorithm to mitigate interference. However, 802.16m allocates RB using OFDMA. In dynamic scheduling in both uplink and downlink, the authors observed that LTE-TDD outperforms 802.16m, ...