What is OpenBTS ?

OpenBTS is a Unix application that uses a software radio to present a GSM air interface to standard 2G GSM handset and uses a SIP softswitch or PBX to connect calls.

OpenbBTS

History of OpenBTS:

The project was started by Harvind Samra and David A. Burgess back in 2008.
The main aim of the project is to reduce the cost of GSM service provision in rural areas and the developing world.
Some Important Points:
The minimum viable network can be as small as a single cell, operated without integration into an existing GSM network.
OpenBTS is an all-software system, including a software-defined radio, provided with full source code and portable to any POSIX environment.
The OpenBTS VoIP-based backhaul is robust against packet loss, allowing it to traverse low-quality IP links reliably.

Hardware Used in OpenBTS:

The main hardware device is Ettus' Universal Software Radio Peripheral (USRP).
The RF RX part of the GSM access point consists of a simple ground plane antenna (triple leg).
An Amplifier.
A duplexer.

Software used in OpenBTS:

Software that is used in OpenBTS is Asterisk VoIP PBX.
OpenBTS uses Asterisk not only for handling VoIP calls, also for user authentication.
Every mobile user has to be registered in the sip.conf with its particular IMSI(International Mobile Subscriber Identity).

OpenBTS Releases:

P2.6 and P2.8 models
In P2.6 the configuration is driven from a text file.
P2.8 is the latest one where the configuration is database driven.

Changes made in P2.8:

In P2.8, configuration is no longer from a text file but from an sqlite3 database at /etc/OpenBTS/OpenBTS.db which is database driven.
Database-driven configuration allows external applications to control critical operating parameters of the OpenBTS system.

Advantages:

No need to purchase a huge BTS equipment. Only some small hardware and one software defined radio equipment is enough to run the BTS.
Cost is 1/10 of traditional BTS installation.
Web based and automated configuration management tools.
Allows many operating parameters to be changed without disrupting the service.

Potential Applications:

Rural/village telephony and text messaging.
Cellular coverage in remote areas (e.g. ships, oil rigs).
Law enforcement and security operations
Rapidly deployable emergency communications.
Network emulation and handset testing.
Wireless local loop service.

What is E-band Radio?

E-Band Radio works in E-Band spectrum (71-76 GHz, 81-86 GHz and 92-95 GHz) , has been designated for ultra-high capacity point-to-point communications (fixed links).
 1 Gbps throughput - LTE (Long Term Evolution) and 4G ready

E-Band Radio over traditional 6-38 GHz band:


How high data rate like 1Gbps is possible?

The largest allocated channel in the 6-38 GHz spectrum is 56 MHz while the smallest typical channel size in the E-Band is 250 MHz - which can scale up to 5 GHz (as seen in Figure).
 By utilizing the large channel size the huge throughput is possible in E-Band Radio.

Dramatic Reduction of License fee:

License fee for E-Band is light and negligible.
 Example: In the UK, for example, the licensing fees for E-Band frequency licenses are negligible - costing £50 for an annual license per link. While in the USA the frequency license is even lower, with a 10-year license costing $75 per link. In contrast, a frequency license in the 6-38 GHz spectrum can cost up to several thousands of dollars annually.

More Advantages of E-Band Radio:

Revolutionary all-silicon-based design delivers the industry’s lowest TCO (Total Cost of ownership) with prices lower than comparable systems.
 Quick and easy installation, requires minimal site preparation.
 Operates in licensed, uncongested and inexpensive 71-76 GHz E-Band spectrum.
 Green Design – ultra low power consumption, zero footprint ,all out-door , extremely light weight.
Can this be integrated with existing network?
Yes, E-Band radio is standard-based for seamless integration into existing networks.
 Also supports multi-vendor interoperability.

Conclusion:

By enabling delivery of
 Gigabit-per-second data rates,

What is LiFi ?

LiFi is transmission of data through illumination by taking the fiber out of fiber optics by sending data through a LED light bulb that varies in intensity faster than the human eye can follow.
A LiFi Environment

Is It a Proven Technology?

Yes, this is already proven.
Harald Haas demonstrated his invention using an ordinary table lamp that successfully transmitted data at speeds exceeding 10Mbps using light waves from LED light bulbs to a computer located below the lamp.
To prove that the light bulb was the source of the data stream, he periodically blocked the beam of light, causing the connection to drop.

LiFi Technology At a Glance!

The LED bulb will hold a micro-chip that will do the job of processing the data.
The light intensity can be manipulated to send data by tiny changes in amplitude.
This technology uses visible spectrum of light ,a part of the electromagnetic spectrum that is still not greatly utilized.
In fact the technology transfers thousands of streams of data simultaneously, in parallel, in higher speeds with the help of special modulation, using a unique signal processing technology.
Some Points of LiFi
The light used to transmit the data is called D-light by Harald Hass,the inventor of LiFi.
 In future data for laptops, Smartphone's, and tablets can be transmitted through the light in a room by using LiFi.
Security would be a snap—if you can’t see the light, you can’t access the data.

Applications of LiFi:

Can be used in the places where it is difficult to lay the optical fiber like hospitals. In operation theatre LiFi can be used for modern medical instruments.
 In traffic signals LiFi can be used which will communicate with the LED lights of the cars and accident numbers can be decreased.
 Thousand and millions of street lamps can be transferred to LiFi lamps to transfer data.
In aircraft LiFi can be used for data transmission.
It can be used in petroleum or chemical plants where other transmission or frequencies could be hazardous.

Conclusion

The possibilities are numerous and can be explored further. If his technology can be put into practical use, every bulb can be used something like a Wi-Fi hotspot to transmit wireless data.

iPhone 4S Is Going to be Released in China on Next Friday (January 13)


Today on 4th July,2012 Apple announced that their most popular smart phone iPhone 4S is going to be released in China and other 21 countries on the next Friday,13 January,2012.The Apple CEO Tim Cook told that this is going to be a massive hit before Chinese new year which is on 23rd January.
He also stated that after this release iPhone 4S will be available in total 90 countries in the globe.
The source is from the official press release.

Ollo - The Latest Wireless Internet Service Provider In Bangladesh !


The magic of wireless communication is touching the whole world.Bangladesh is also in that touch.People are preferring wireless devices instead of wired devices.As people are mobile all the time,devices are also mobile.So,to connect the devices to the whole world there is no alternative to use wireless internet.
Keeping this in mind another Wireless Internet Service provider company named as "Ollo" has entered in the telecommunication market of Bangladesh though two other wireless internet companies,Qubee and Banglalion, are getting well established.

The marketing strategy is a smart one for Ollo.You will see billboards and banners in the main highways of the capital.Also you will find some festoons in front of some telecom service shops in your area.
The advertisements are so tricky that it will make you know about it.You will surely make a search in your internet browser to what the company or service is all about.
Ollo is the brand of Multinet Group in Bangladesh.Who had started their journey in Bangladesh year back with the optical fiber internet service providing.But now they are providing the internet with wireless technology.
Though their network is now limited to the Dhaka city but they will start to provide the internet to the rural area in a very short time.
The zone that Ollo is covering in Bangaldesh is only in Dhaka and the areas are Uttara,Gulshan and Dhanmondi.
The speed that they are offering right now 512 and you can get it from a nearer shop in your area which is an ollo representative agent.

Dongle + 40 GB 1,499 taka
Dongle + Cradle + 40 GB                2,250 taka
To make an order by phone just call to
Call now 01938838-444

Address of Ollo Corporate office  is below:
Ollo Wireless Internet
Floor # 5 & 6, Plot # 19 & 20, Road # 113/A
Gulshan Model Town, Gulshan 2, Dhaka 1212, Bangladesh
Tel: +88 02 8828728 Fax: +88 02 882938

Devices that Ollo use:
 1.Dongle:

AX326 Wireless USB Modem is a smart modem at a reasonable price. You can use this device within 200 meters from Ollo Base Station.

2.Cradle

SX361 Wireless Cradle is a remote antenna to receive better signal. If your residence is more than 200 meters away from Ollo Base Station.

3.Cable:

USB Extension Cable will help you to place a dongle in a better signal reception place.
Website is: www.ollo.com.bd