QoE-Aware Inter-Cell Interference Mitigation for Dynamic TDD Networks
Date Issued
2016
Date
2016
Author(s)
Chen, Yu-Chieh
Abstract
In LTE dynamic time division duplexing (dynamic TDD), seven uplink-downlink configurations (UL-DL configurations) are supported to accommodate downlink/uplink traffic asymmetry for traffic adaptation. The Third Generation Partnership Project (3GPP) has considered the opportunity of adopting such dynamic adaptation of UL-DL configurations in small cell networks to enlarge the network capacity. However, dynamic TDD inducing opposite transmission directions in different cells results in new destructive interference components, i.e., BS-to-BS and UE-to-UE interference, which makes the inter-cell interference in small cell networks even worse. In this paper, a QoE-aware interference mitigation scheme is proposed to mitigate interference and to manage QoE as well in small cell deployment networks. The scheme explicitly uses the received signal strength and QoE state of users to generate a QoE-aware interference graph, where vertices represent cells, edges represent intolerant inter-cell interference among the incident cells and weights represent the utility increment of QoE. Then, a graph-based optimisation problem is formulated to determine which cells are allowed to transmit to maximize the system utility of QoE. Further, a linear-time approximation algorithm is proposed for large-scale deployment environments. The LTE-based simulation results show that the proposed QoE-aware interference mitigation scheme significantly improves overall QoE and also alleviate inter-cell interference. Finally, based on the simulation, we provide some insight into QoE management and interference mitigation in both homogeneous and heterogeneous networks operating dynamic TDD.
Subjects
LTE Dynamic TDD
small cell
interference mitigation
QoE
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-105-R02921099-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):ea4f3567529f5827273c3206d995b5f3