A mobile ad-hoc network is an autonomous system of mobile routers that are self-organizing and completely decentralized with no requirements for dedicated infrastructure support. However, such infrastructure in terms of base stations is available in many popular areas already. These base stations often offer high-speed data connectivity to a wired network. In this paper, we describe an approach...

Objective(s): Scientific interest in potential mobile phone impact on human brain and performance has significantly increased in recent years. The present study was designed to evaluate the effects of mobile phone radiation on seizure threshold in mice. Materials and methods:BALB/c male mice were randomly divided into three groups: control, acute, and chronic mobile phone radiation for 30, 60, ...

NTT DOCOMO Technical Journal Vol. 12 No. 2 †1 Currently Strategic Marketing Department †2 Currently Corporate Strategy & Planning Department *1 Fixed-line backhaul link: Communication circuit for fixed-line interconnecting of equipment making up the mobile communications system such as switching stations and radio base stations. *2 Repeater: Physical layer relay equipment that amplifies downlin...

introduction : the  rapid development  of wireless telecommunication technologies  over the past decades, has led to significant changes in the exposure of the general public to electromagnetic fi elds. nowadays, people are continuously exposed to different sources of electromagnetic fi elds such as mobile phones, mobile base stations, cordless phones, wi-fi routers, and power lines. therefore,...

【】 Indicates Sales by Region < > Indicates % Change Over Same Period in Previous Year In Japan, third-quarter net sales were 1,010.2 billion yen (US$9,021 million), a 7.6% increase compared to the same period in the prior fiscal year. Although there was a decrease in sales of mobile phone base stations and other products, higher sales of services, PCs, mobile phones, and advanced technology log...

The coordination of base stations in mobile access networks is an important approach to reduce harmful interference and to deliver high data rates to the users. Such coordination mechanisms, like Coordinated Multi-Point (CoMP) where multiple BSs transmit data to a user equipment, can be easily implemented when centralizing the data processing of the base stations, known as Cloud RAN. This centr...

Infrastructure-based wireless networks have base stations (access points). Advantages over Ad-hoc networks : efficiently utilize network resources. single-hop routes, results in : lower delay and loss higher data rates Examples : Wireless LANs, paging systems, and cellular phone systems.

Beamforming has been deployed in mobile phone standards starting already with 2G. The techniques have become ever more sophisticated with each iteration. 4G/LTE, for example, deploys MIMO-based beamforming. In general, direct multi-user beamforming [1], [2] – creating beams for each individual devices from mobile phone masts – is a gargantuan task. There are simply too many users, and a steady ...

Disaster response requires communications among all affected parties including emergency responders and the affected populace. Wireless telecommunications, if available through a fixed structure cellular mobile network, satellites, portable station mobile networks and ad hoc mobile networks, can provide this means for such communications. While the deployment of temporary mobile networks and ot...