Analyzing X2 handover in LTE/LTE-A

Alexandris, Konstantinos; Nikaein, Navid; Knopp, Raymond; Bonnet, Christian
WINMEE 2016, Wireless Networks: Measurements and Experimentation, May 9, 2016, Arizona State University, Tempe, Arizona, USA

Handover procedure in LTE/LTE-A has been radically evolved when compared to the previous 3GPP standards. In particular, X2 handover is introduced to allow neighboring
eNBs to handle the user mobility without the involvement of the core network. While most of the application could considerably benefit from the X2 handover performance improvement, delay breakdown and impact of parameters from the UE perspective
are not well investigated. This paper analyzes the performance of the X2 handover
from the UE perspective. Furthermore, the impact of the different parameters on the handover decision algorithm is investigated. Preliminary results, obtained from the OpenAirInterface LTE/LTE-A emulation platform, demonstrate that main delay
bottleneck resides in the uplink synchronization of the UE to the target eNB.

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