Analysis of an Adaptive Switching Point for LTE TDD by Dynamic System-Level Simulations

Authors

  • Christian Backfrieder University of Applied Sciences Upper Austria
  • Gerald Ostermayer University of Applied Sciences Upper Austria

Abstract

This paper introduces an LTE system level simulator
and presents investigations of scenarios with differently balanced
traffic emergence between uplink and downlink as well as
inhomogeneous distribution of link direction asymmetry. In the
TDD mode of LTE, duplexing is implemented via sharing the
time domain between uplink and downlink users. This is done by
different switching configurations, which offer varying capacity
distributions between downlink and uplink, from a downlinkheavy
configuration with 90 percent of the capacity in downlink
direction to uplink heavy configurations with 60 percent uplink.
We utilize the available capacity perfectly by adjusting the link
configuration appropriately to traffic emergence. Performance
gains when selecting a configuration appropriate to the arising
traffic compared to usage of a static configuration with equally
distributed capacity are investigated. In case of different configurations,
additional interference can occur in neighbored cells
due to distinct communication direction at the same time. We
clarify the differences between these scenarios and quantify the
gains and losses when the switching point between uplink and
downlink is variable.

Author Biographies

Christian Backfrieder, University of Applied Sciences Upper Austria

Research Group Networks and Mobility, Department
of Mobile Computing

Gerald Ostermayer, University of Applied Sciences Upper Austria

Department of Mobile Computing

References

G. Piro, L. Grieco, G. Boggia, F. Capozzi, and P. Camarda, “Simulating

LTE cellular systems: An open-source framework,” IEEE Transactions

on Vehicular Technology, vol. 60, pp. 498–513, Feb. 2011.

J. Ikuno, M. Wrulich, and M. Rupp, “System level simulation of LTE

networks,” in Vehicular Technology Conference (VTC 2010-Spring),

IEEE 71st, pp. 1–5, May 2010.

Q. Zheng, H. Du, J. Li, W. Zhang, and Q. Li, “Open-LTE: An open

LTE simulator for mobile video streaming,” in 2014 IEEE International

Conference on Multimedia and Expo Workshops, pp. 1–2, July 2014.

Y. Wang, S. Frattasi, T. Sorensen, and P. Mogensen, “Network timesynchronization

in TDD based LTE-advanced systems,” in Vehicular

Technology Conference, 2009. VTC Spring 2009. IEEE 69th, pp. 1–5,

Apr. 2009.

Y. Wang, K. Valkealahti, K. Shu, R. Sankar, and S. Morgera, “Performance

evaluation of flexible TDD switching in 3gpp LTE system,” in

35th IEEE Sarnoff Symposium (SARNOFF), pp. 1–4, May 2012.

J. R. Kulcsar, “Qualit¨atsevaluierung repr¨asentativer Werte f¨ur das Interface

zwischen Link-Level- und System-Level-Simulatoren in Mobilkommunikationssystemen,”

Master’s thesis, Fachhochschule Hagenberg,

Austria, 2009.

J. C. Ikuno, M. Wrulich, and M. Rupp, “System level simulation of LTE

networks,” in Proc. 2010 IEEE 71st Vehicular Technology Conference:

VTC2010-Spring, (Taipei), May 2010.

J. B. Andersen, T. S. Rappaport, and S. Yoshida, “Propagation measurements

and models for wireless communications channels,” Comm. Mag.,

vol. 33, pp. 42–49, Jan. 1995.

J.-E. Berg, “A recursive method for street microcell path loss calculations,”

in Personal, Indoor and Mobile Radio Communications, 1995.

PIMRC’95. ’Wireless: Merging onto the Information Superhighway’.,

Sixth IEEE International Symposium on, vol. 1, pp. 140–143, 1995.

C. Osterkorn, G. Ostermayer, and M. Huemer, “Comparison of oneand

two-dimensional slow fading models in mobile radio system simulations,”

in IEEE 16th International Symposium on Personal, Indoor and

Mobile Radio Communications, 2005. PIMRC 2005, vol. 4, pp. 2650–

Vol. 4, Sept. 2005.

T. T. Ha, Theory and Design of Digital Communication Systems.

Cambridge University Press, 2010.

E. Dahlman, S. Parkvall, J. Skold, and P. Beming, 3G Evolution, Second

Edition: HSPA and LTE for Mobile Broadband. Academic Press, 2008.

V. Pauli, I. Viering, C. Buchner, E. Saad, G. Liebl, and A. Klein, “Efficient

link-to-systemlevel modeling for accurate simulations of MIMOOFDM

systems,” in Proceedings of the 2009 IEEE international conference

on Communications, ICC’09, (Piscataway, NJ, USA), pp. 3599–

, IEEE Press, 2009.

M. Wrulich, S. Eder, I. Viering, and M. Rupp, “Efficient Link-to-System

Level Model for MIMO HSDPA,” in IEE GlobeCom, IEEE Press, 2008.

A. G. Alexiou, C. Bouras, V. Kokkinos, A. Papazois, and G. Tsichritzis,

“Efficient MCS selection for MBSFN transmissions over LTE networks.,”

in Wireless Days, pp. 1–5, IEEE, 2010.

3GPP, “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical

layer procedures,” TS 36.213, 3rd Generation Partnership Project

(3GPP), Sept. 2008.

ETSI, “Universal Mobile Telecommunications System (UMTS); Selection

procedures for the choice of radio transmission technologies of the

UMTS,” tech. rep., ETSI, 1998. TR 101 112 V3.2.0 (1998-04).

Downloads

Published

2015-06-11

Issue

Section

ARTICLES / PAPERS / General