3rd Generation Partnership Project (3GPP) has recently completed the specification of the Long Term Evolution (LTE) standard. Majority of the world’s operators and vendors are already committed to LTE deployments and developments, making LTE the market leader in the upcoming evolution to 4G wireless communication systems. Multiple input multiple output (MIMO) technologies introduced in LTE such...

TD-LTE, one of the two duplexing modes in LTE, operates in unpaired spectrum and has the advantages of TDD-based technologies. It is expected that TD-LTE will be more rapidly deployed in near future and most of WiMax operators will upgrade their networks to TD-LTE gradually. Before completely upgrading to TD-LTE, WiMax may coexist with TD-LTE in an adjacent frequency band. In addition, multiple...

LTE networks are becoming more and more popular nowadays. There are two main problems in implementing LTE networks coverage and capacity. Both these problems can be solved by deploying femtocells in LTE networks. Interference occurs between newly added femtocell and pre existing macrocell as macrocell and femtocell share same frequency band. Macrocell-femtocell interference management is bigges...

This paper assumes that Long Term Evolution (LTE) will be deployed in TV White Spaces (TVWSs). Beamforming is a technology that is applied to an LTE base station (BS) for reducing interference impact of LTE on DTV. A simulation method based on Monte Carlo is proposed to evaluate the interference probability in DTV receivers in the case of interference impact of LTE BS on DTV receiver. As per si...

Shoji Hamao, Yuji Yoshida [Summary] Mobile phone networks in Japan are switching from 3G to 3.9G/4G (LTE hereafter). However, there are some overlapping frequency bands between 3G and LTE. Further, mixed 3G and LTE networks will remain in place for some years due to the high cost of replacing legacy 3G network infrastructure. Consequently, measuring instruments that can obtain stably outcome ne...

Mobile communication systems now constitute an essential part of life throughout the world. Fourth generation “Long Term Evolution” (LTE) mobile communication networks are being deployed. The LTE suite of specifications is considered to be significantly better than its predecessors not only in terms of functionality but also with respect to security and privacy for subscribers. We carefully ana...

As a next generation of Global System for Mobile Communications – Railway (GSM-R), 3rd Generation Partnership Program (3GPP) Long Term Evolution (LTE)/ LTE-Advanced (LTE-A) is considered for railroad wireless communication, i.e., LTE-Railway (LTE-R). Railroad wireless communication has its own requirements and functions since railroad wireless communication is very closely related to safety. In...

Coexistence of Wi-Fi and LTE in unlicensed spectrum (LTE-U) is recently drawing significant concern in industry. In this paper, we investigate the Wi-Fi performance in the presence of duty cycle based LTE-U transmission on the same channel. More specifically, one LTE-U cell and one Wi-Fi basic service set (BSS) coexist by allowing LTE-U devices transmit their signals only in predetermined duty ...

The era of new wireless communications is upon us. Eventually it will penetrate into our daily life and change the way we live just like many technological innovations whose original research came from the life needs. To achieve these requirements, the society of 3 Generation Partnership Project (3GPP) is presently evolving Long Term Evolution Advanced (LTEAdvanced) as a development of the stan...

The advanced cellular network, Long Term Evolution (LTE) which presently operates in licensed spectrum has been extended to Unlicensed LTE (U-LTE) by Qualcomm and Ericsson to improve data rate and spectral efficiency by utilizing unlicensed spectrum. Carrier Aggregation of 3GPP LTE-A supports the aggregation of licensed and unlicensed spectrum in small and femto cells to provide better user exp...