Haibo Xu

In-Device Coexistence Interference Evaluation and Detection in LTE-A System

In this paper, the in-device coexistence (IDC) interference detection is discussed for the user equipment (UE) with collocated long-term evolution (LTE) radio and WiFi radio. First, the comprehensive analysis is carried out to derive that the LTE transmission failure caused by the IDC interference from WiFi radio is related to the number of sub-frames overlapped with the WiFi transmission (called overlapped sub-frame). After that, consider the number of the detected overlapped subframes may be larger than that used to declare the serious IDC interference, an enhanced scheme is proposed to allow the enhanced NodeB (eNB) inform UE the threshold on the number of detected overlapped sub-frames. The numerical and simulation results indicate that the proposed scheme can largely reduce the detection overhead.

Proactive unnecessary handover avoidance scheme in LTE-A small cells

In this paper, the unnecessary handover avoidance scheme is discussed in Long Term Evolution-Advanced (LTE-A) small cells. Specifically, a handover is considered as unnecessary one if the active time in the target cell (i.e., duration where the user equipment can perform data communication) is not larger than a pre-defined threshold, where the active time is predicted before the handover through the average increased active time due to one packet arrival and the number of packets arriving during the dwell time in the cell. After that, if the probability that the active time is not larger than the pre-defined threshold is large enough, the source eNB would not carry out such handover due to the potential unnecessary handover. The numerical and simulation results verify that the proposed scheme can avoid the unnecessary handover precisely and efficiently.