Mobile IP explained

Mobile IP is the underlying technology for support of various mobile data and wireless networking applications. For example, GPRS depends on mobile IP to enable the relay of messages to a GPRS phone via the SGSN from the GGSN without the sending needing to know the serving node IP address.
The Impetus for Mobile IP
With the advent of packet based mobile data applications and the increase of wireless computing, there is a corresponding need for the ability for seamless communication between the mobile node device and the packet data network (PDN) such as the Internet.
Mobile IP Definitions
Mobile Node: A device capable of performing network roaming
Home Agent: A router on the home network which serves as the a point for communications with the mobile node.
Foreign Agent: A router that functions as the mobile node's point of attachment when it travels to the foreign network.
Care of Address: Termination point of the tunnel toward the mobile node when it is not in the home network.
Correspondent Node: The device that the mobile node is communicating with such as a web server
Mobile IP in Operation
To accomplish this, mobile IP established the visited network as a foreign node and the home network as the home node. Mobile IP uses a tunneling protocol to allow messages from the PDN to be directed to the mobile node's IP address. This is accomplished by way of routing messages to the foreign node for delivery via tunneling the original IP address inside a packet destined for the temporary IP address assigned to the mobile node by the foreign node. The Home Agent and Foreign Agent continuously advertise their services on the network through an Agent Discovery process, enabling the Home Agent to recognize when a new Foreign Agent is aquired and allowing the Mobile Node to register a new Care of Address.
This method allows for seamless communications between the mobile node and applications residing on the PDN, allowing for seamless, always-on connectivity for mobile data applications and wireless computing.
Mobile IP enabled Applications
Mobile IP technology is embedded in the functionality of packet equipment for 2.5G and 3G.  In addition, mobile IP enables advanced applications such as unified messaging.

18:58 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |

UMTS will not succeed

today I got introduced to the technology of WiMAX check http://www.wimaxforum.org/home. I already know that the mobile phone operators that invested to much in UMTS will not get much $$ from it, I think the future is more in technologies that are related to WIFI, I think we must invest in Fast Wireless Data Networks (FWDN). This will be the future!
your mobile father

13:31 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |


One Box Fits All Software Radios

Researchers at Virginia Tech's Mobile and Portable Radio Research Group have written open-source radio software that may lead to creation of a single device that can receive and decode everything from emergency services radio signals to television -- and act as a garage-door opener. 
 When people think of a radio, they usually think of a small box that uses an antenna to pick up and play AM talk or FM music.

But a radio is any device that transmits or receives signals in the radio frequency (RF) part of the electromagnetic spectrum.

By that broad definition, radios include televisions, cell and cordless telephones, pagers, and even garage door openers.

So why don't we think of these everyday electronic gadgets as the radios they are?

Because they all have different hardware, or more simply, they all come in a different box.

Too Many Boxes

A combination TV/AM-FM device operates with two separate radios -- one to receive television broadcasts and the other to receive radio broadcasts.

Two distinct transmitters would also have to operate a combo garage and car door opener. A fire chief using a walkie-talkie could only contact a police officer if the two radios had the same type of hardware.

Clearly, dedicated hardware limits the function of a radio.

If one box, however, fit all, radios would become more like computers, whose function fluctuates with whatever software is running at the time.

That's the idea behind the so-called "software radio."

FM/AM with a Higher IQ

If you took an IQ test with this analogy: word processor is to spreadsheet as FM radio is to garage door opener, you might think the examiner was crazy.

Unless, of course, you knew about so-called "software radio."

Using a software radio, that flummoxed fire chief can simply load software designed to communicate with the police officer's radio -- a transition made possible because software rather than hardware defines the radio's signal processing capability.


Software radios use software to modulate and demodulate radio signals.

Modulating a radio signal is a way to encode sounds on radio waves. Modulating the wave in an AM, or "amplitude modulation," radio adjusts the amplitude of an electrical wave that a receiver then filters and amplifies, producing an audible sound.

Adjusting the frequency rather than amplitude of a radio wave to encode audible information is known as "frequency modulation," or FM.

Radios can use dozens of modulation techniques, however, including phase modulation (PM); pulse modulation; sideband modulation; and several others.

But until software radio, the idea of using one radio with all these modulation techniques was far-fetched at best.

Of course, with computer software, no one questions the idea of using one box to do multiple tasks -- Web surfing, word processing, database  building, and e-mailing, for instance.

Radio Wave of the Future

Software radio has been the purview of the entrepreneurial open-source community.

A recent addition to free open-source radio software available around the Web comes from Virginia Tech's Mobile and Portable Radio Research Group (MPRG).

"The tool available on the Virginia Tech Web site already has been downloaded by numerous companies and universities from around the world," said Jeffrey Reed, professor of electrical and computer engineering and deputy director of the MPRG.

Written in C++, OSSIE (Open-Source Software Communication Architecture Implementation: Embedded) is an operating environment, or software framework, that supports programming and operation of software radios.

MPRG's Robert and a team of graduate students first developed OSSIE as a tool for a software radio research project sponsored by the Office of the Director of the Central Intelligence Agency.

"Robert and Reed soon realized that other researchers could use OSSIE in their development of software radios," explained Virginia Tech spokesperson Liz Crumbley. "They also realized that pooling software with other researchers would add to a collective knowledge base for the creation of a variety of working software radios."

Open Source

Researchers can download OSSIE free, but "are responsible for sharing their findings for free with other researchers," Crumbley said.

"Offering OSSIE as an open-source tool over the Internet will speed up growth of the technology and make faster innovations possible," Robert said. "This will benefit all wireless  researchers who are working to develop software radios."

If the evolution of the PC  is any indication, software radio may be the radio wave of the future.

"Software radio technology is today where personal computer technology was in the 1970s," said Max Robert, the MPRG post-doctoral Fellow who led development of OSSIE.




At last a revolution in the Wireless Software Radio technology!


22:19 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |


Europe ripe for I-mode ???

DoCoMo Sees Europe as Ripe for I-Mode

DoCoMo Sees Europe as Ripe for I-Mode

NTT DoCoMo has launched its i-mode cell phone service in Britain and Ireland through a deal with British company mm02. DoCoMo believes it eventually could gain 60 million users in Europe alone as the Internet service gains acceptance. The firm is eyeing Scandinavia and Eastern Europe for future tie-ups.
Japan's top mobile operator NTT DoCoMo  believes Europe will embrace hi-tech telephones and expects a major boost in subscribers on the continent of its i-mode Internet service, a report said Thursday.

I-mode, which allows users to access e-mail, watch film video clips and carry out online banking via their handsets, currently has some three million subscribers outside Japan through 11 tie-ups.

But NTT DoCoMo reckons it can eventually draw 60 million users in Europe alone as the technology gains acceptance, with the firm eyeing Scandinavia and Eastern Europe for future tie-ups, company president Masao Nakamura told the Nihon Keizai Shimbun.

"The foundation for developing i-mode-based services in major European countries has been laid," he told the business daily newspaper.

On Tuesday, NTT DoCoMo announced i-mode's launch in Britain and Ireland, to start in the second half of 2005, through a deal with British company Mm02.

NTT DoCoMo has been a pioneer of third-generation telephone services, which offer high-tech functions such as videophones. The group plans to phase out existing second-generation subscriptions altogether by 2012.

But most of the world has been slower than Japan to embrace third-generation mobile technology, with concerns over the high cost of handsets.

In early November, British mobile telephone giant Vodafone became the first of Europe's major players to launch mass-market third-generation services, hoping to steal a march on its rivals ahead of the crucial Christmas sales period.

Versions of i-mode can operate both on second and third-generation handsets. 

© 2004 Agence France-Presse



This seems chinese to me ;)

When do we europe poeple go and invest more in the wireless/mobile world? I surely want to do something in the mobile world but nobody offers me a job into it...

19:20 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |

a telephone that breathes...

The cell phone case is made of a new type of polymer that will start to break down within two weeks after burial. "By incorporating a seed, and giving the consumer a reason to actually take the phone apart and dispose of it," says Dr. Kerry Kirwan of Warwick University, "[manufacturers] could save a lot of money, time and effort." 


Researchers at Warwick University have developed a biodegradable mobile phone  case containing a seed that flowers when planted.

The case is made of a new type of polymer that when buried will start to break down within two weeks. A seed is implanted in the case that germinates when the case degrades.

The team hopes that the environmentally friendly casing will be popular with green consumers, and mobile phone companies keen to reduce waste. The research was carried out with Motorola  and PVAXX Research and Development.

"Legislation is now coming out that requires mobile phone manufacturers to take back their products at the end of their lives," said Dr. Kerry Kirwan of the Warwick Manufacturing Group at Warwick University.

"Our idea is that it would cost a lot of money to collect, separate, segregate and dispose of the plastic parts of these mobile phones.

"By incorporating a seed, and giving the consumer a reason to actually take the phone apart and dispose of it, they could save a lot of money, time and effort." 

© 2004 VNU Business Online Limited (UK)

17:45 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |


No Microsoft powered cell phones in Japan

NTT DoCoMo - the biggest Japanese cell phone operator says BIG NO to Microsoft powered cell phones
November 21, 2004 [General]
NTT DoCoMo says: "Symbian - yes, mobile Linux - yes, Microsoft - BIG NO". Well, previously NTT DoCoMo was very promoting wireless Java in its handsets and J2EE Java in its servers (to power i-mode services from NTT DoCoMo) so no wonder that now they chose only those mobile operating systems that run Java natively (as a part of OS, not as a lame add-on).

While many Microsoft employees were visting Japan several times - paid by Microsoft of course - it looks like their visits were totally pointless: not even one Japanese hardware vendor or cellular network operator decided to use Microsoft software (i.e. Microsoft Smartphone or Pocket PC Phone Edition) to power their cell phones.

13:24 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |


RIM intros BlackBerry Java developer tools


Research In Motion (RIM) today announced the availability of its Java Development Environment for BlackBerry v4.0, claiming that the platform's improved API set gives developers enhanced flexibility and support.
<A TARGET="_blank" HREF="http://ad.be.doubleclick.net/click%3Bh=v3|31d4|3|0|%2a|r%3B12375387%3B0-0%3B0%3B6746330%3B3829-360|300%3B7893374|7911270|1%3B%3B%7Esscs%3D%3fhttp://www.hds.com/samsolutions"><IMG SRC="http://www.accountancyage.com/bif_image/vi_px/px.gif" BORDER=0></A>

The company said that the release, which supports Java 2 Platform Micro Edition, also features improved documentation, code samples and applications.

It ships with revamped Java Specification Request implementations including JTWI, MIDP 2.0, CLDC 1.1 and PDAP PIM, an improved IDE and a newly developed BlackBerry handheld simulator.

The latest version includes an XML generator that allows developers to perform XML-related tasks without having to write additional code, and support for Push Access Protocol.

According to RIM, the improvements will help developers more efficiently to integrate applications with BlackBerry email, text messaging, web browser and organiser applications.

"BlackBerry continues to open new opportunities for developers in the world of wireless data and communications by providing a development environment that removes many of the complexities traditionally associated with wireless technology," said David Yach, senior vice president for software at RIM.


Nice, some development tools are always good for developers...

13:22 Gepost door Mobile blogger | Permalink | Commentaren (0) |  Facebook |