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

Christian Backfrieder, Gerald Ostermayer

Research output: Contribution to journalArticlepeer-review

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 downlink-heavy 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.

Original languageEnglish
Pages (from-to)171-178
Number of pages8
JournalInternational Journal of Electronics and Telecommunications
Volume61
Issue number2
DOIs
Publication statusPublished - 1 Jun 2015

Keywords

  • long term evolution
  • mobile network simulation
  • system level
  • time division duplex
  • variable switching point

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