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

Backfrieder C., Ostermayer G.

International Journal of Electronics and Telecommunications

2015

Vol. 61, No. 2

171-178

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.

Function of Motive Situation in Procedure of Leadership of Train Equipped with System ERTMS

Gradowski P., Białoń A., Gryglas M.

Logistics and Transport

2014

Vol. 23, No. 3

55--62

The Railway Infrastructure Manager in Poland initiated the implementation of the ERTMS system. This paper presents the description of level system, modes of work traction vehicles, basic parameters of system and also the exemplary principles of the system operations. These parameters are the elements used by operating scenarios which describe the behaviour in traffic situations on railway lines included in the development of the ERTMS system.