Selasa, 30 Desember 2008

H

where do you want to Holiday??
there are a few question in my head if some one ask this question.
if there aquestion like that there are a few things that we must to think.
1) money that we have?
2) place that we never visit before
3) ask recomendation from our friends or visit blog in internet about the place
4) kind the place that we want: beach, disneyland or what..
5)when that we aant to go..

3G / UMTS Means

3G


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the enormous costs of additional spectrum licensing fees. In many parts of the world 3G networks do not use the same radio frequencies as 2G, requiring mobile operators to build entirely new networks and license entirely new frequencies; a notable exception is the United States where carriers operate 3G service in the same frequencies as other services. The license fees in some European countries were particularly high, bolstered by initial excitement over 3G's potential. Other delays were as a result of the expenses related to upgrading equipment for the new systems.

The first country that introduced 3G on a large commercial scale was Japan. In 2005, about 40% of subscribers used 3G networks only, with 2G being on the way out. It was expected that the transition from 2G to 3G would be largely completed during 2006, and upgrades to the next 3.5G stage with 3 Mbit/s data rates were under way.

The successful 3G introduction in Japan showed that video telephony was not the killer application for 3G networks after all. The real-life usage of video telephony on 3G networks was found to be a small fraction of all services. On the other hand, downloading of music found strong acceptance by customers. Music download services in Japan were pioneered by KDDI with the EZchakuuta and Chaku Uta Full services.

3G networks are not IEEE 802.11 networks. IEEE 802.11 networks are short range, higher-bandwidth (primarily) data networks, while 3G networks are wide area cellular telephone networks which evolved to incorporate high-speed internet access and video telephony.


BaCkground

In 2001, NTT DoCoMo—one of the giant telecommunication companies in Japan—was the first telecommunication company to launch a commercial W-CDMA network. The introduction of 3G services within Europe began in early 2003.

The official 3G mobile network is the systems and services based on the International Telecommunication Union (ITU) family of standards under the International Mobile Telecommunications programme, "IMT-2000". A boost was given to 3G mobile networks in Europe when the European Union council suggested that the 3G operators should cover 80% of the European national populations by the end of 2005. The first service of 3G in north Africa started in Morocco late of March provided by the new company, Wana. The other operator should start their network in the middle of 2007. Vodafone Egypt (also known as CLICK GSM) will provide the service in Egypt in the middle of 2006. Early 2007, Vodacom Tanzania switched on its 3G HSDPA in Dar ea salaam. With the installation of a 3G HSDPA network, Tanzania is only the second country in Africa with such technology, the first being South Africa. In March 2007, Nigeria awarded 3G telecommunication licenses to the nation's three major GSM companies and a relatively unknown operator, Alheri Engineering Co. Ltd, to enable them to expand their scope of operation in the industry. Canada does not have a true implementation of 3G standards as of 2007. The Canadian Government is currently holding hearings on the matter with the intention of allowing more spectrum for its deployment.

Features

The most significant feature offered by third generation (3G) mobile technologies is the capacity to support greater numbers of voice and data customers — especially in urban centres — as well as higher data rates at lower incremental cost than 2G.

By using the radio spectrum in bands identified, which is provided by the ITU for Third Generation IMT-2000 mobile services, it subsequently licensed to operators. 3G uses 5 MHz channel carrier width to deliver significantly higher data rates and increased capacity compared with 2G networks.

The 5 MHz channel carrier provides optimum use of radio resources for operators who have been granted large, contiguous blocks of spectrum. On the other hand, it also helps to reduce the cost to 3G networks while being capable of providing extremely high-speed data transmission to users.

It also allows the transmission of 384kbps for mobile systems and 2Mbps for stationary systems. 3G users are expected to have greater capacity and improved spectrum efficiency, which will allow them to access global roaming between different 3G

Standard 3G

International Telecommunications Unit (ITU): IMT-2000 consists of six radio interfaces

Evolution to 3G

The Evolution to 3G describes the updating of cellular mobile telecommunications networks around the world to use new 3G technologies. This process is taking place over the period 1999 to 2010. Japan is the first country having introduced 3G nationally, and in Japan the transition to 3G has been largely completed during 2005/2006. 3G technologies enable network operators to offer users a wider range of more advanced services while achieving greater network capacity through improved spectral efficiency.

[edit] Operators and UMTS networks

As of 2005, the evolution of the 3G networks was on its way for a couple of years. The main reason for these changes are basically the limited capacity of the existing 2G networks. The second generation of networks were built mainly for telephone calls and slow data transmission. Due to the rapid changes in technology, these factors do not meet the requirements of today's wireless revolution. The developments of so-called "2.5G" (or even 2.75G) technologies such as i-mode data services, camera phones, HSCSD and GPRS have been ways of bridging the oncoming change to 3G networks, but are not permanent solutions. They are merely stepping stones towards the new technology. These stepping stones were built to introduce the possibilities with the future wireless application technology to the end consumers. These procedures are necessary to ensure that the operators and the infrastructure itself have a healthy ground to operate on.

The evolution of networks from the second generation of technologies to the third generation technologies could not be done without the help of network operators. In 2005 there were about 23 networks worldwide that operated on 3G technologies, the most advanced being KDDI in Japan. Some of these networks were only for test use but some were already in consumer based use.

Network operators have invested huge amounts of money into existing 2G networks. These networks have been around only for 10-15 years, and the investments made have not all paid off. Network operators need to find out ways of reusing their investments to build the 3G network. Because of the financial situation of the world, network operators do not necessarily have new resources to invest in the future. They must recycle the old ones first.

Another thing network operators need to understand is that their roles are changing dramatically. They are becoming not only network providers, but also service providers. Network operators need to differentiate themselves in the markets, and one way is to concentrate on the content of the service and products. It is widely believed that the markets will consist of content oriented service providers, since 3G technology allows anyone willing to build software and sell it directly to end consumers. Thus network operators need to adapt to this change too.

2G to 3G Network standardisation

The International Telecommunication Union (ITU) has defined the demands for third generation mobile networks with the IMT-2000 standard. An organisation called 3GPP has continued that work by defining a mobile system that fulfils the IMT-2000 standard. This system is called Universal Mobile Telecommunications System (UMTS). The evolution of the system will move forward with so called releases. In each release new features will be introduced. The following features are just examples of many others in these new releases.

Release '99

  • Bearer services
  • 64 kbit/s circuit switched
  • 384 kbit/s packet switched
  • Location services
  • Call services: GSM-compatible, USIM-based

Release 4

  • Edge radio
  • Multimedia messaging
  • MeXe levels
  • Improved location services
  • IP Multimedia Services (IMS)

[Release 5

Release 6

  • WLAN integration
  • Multimedia broadcast and multicast
  • Improvements in IMS
  • HSUPA

There are several different paths from 2G to 3G. In Europe the main path starts from GSM when GPRS is added to a system. From this point it is possible to go to the UMTS system. In North America the system evolution will start from TDMA going to EDGE and from there to UMTS.

In Japan, there are two 3G standards used: W-CDMA (which is compatible with UMTS) by NTT DoCoMo, Vodafone KK, and by new entrants, and cdma2000 which is very successfully used by KDDI. Transition to 3G is being largely completed in Japan during 2005/2006.

Layered Network Architecture Advantages

The UMTS system is based on layered services, unlike GSM. On the top there is the services layer, which will give advantages like fast deployment of services and centralized location. In the middle there is the control layer, which will help upgrading procedures and allow the capacity of the network to be dynamically allocated. On the bottom is the connectivity layer where any transmission technology can be used and the voice traffic will transfer over ATM/AAL2 or IP/RTP.

Mobile technologies

The first new technology when going from GSM towards UMTS is General Packet Radio Service (GPRS). It is the trigger to 3G services. The main point is that the network connection is always on, so the subscriber is online all the time. From the operator's point of view, it is important that GPRS investments are re-used when going to UMTS. Also capitalizing on GPRS business experience is very important.

From GPRS, operators could go directly to UMTS, but they could also invest in an EDGE system. One advantage of EDGE is that there is no new licence needed as in UMTS. The frequencies will also be re-used and no new antennas are needed. The main issue is that subscribers will have to buy new EDGE terminals.

From GPRS to UMTS

The key point when going to UMTS is the use of the existing mobile network. From GSM core network side, the following network elements are reused:

  • MSC (Mobile switching centre) (vendor dependent)
  • AUC (Authentication centre)
  • HLR (Home location register)
  • VLR (Visitor location register)
  • EIR (Equipment identity register)

From GPRS network, the following network elements will be reused:

  • SGSN (Serving GPRS Support Node) (vendor dependent)
  • GGSN (Gateway GPRS Support Node)

From GSM radio network, the following network elements can NOT be reused. Note, however they can remain in the network and be used in dual network operation where 2G and 3G networks co-exist while network migration and new 3G terminals become available for use in the network.

  • BSC (base station controller)
  • BTS (base transceiver station)

The UMTS network introduces new network elements that give functionality as given in the 3GPP specifications:

  • Node-B (base station)
  • RNC (Radio Network Controller)
  • MGW (Media Gateway)

The functionality of MSC and SGSN changes when going to UMTS. In a GSM system the MSC handles all the circuit switched operations like connecting A- and B-subscriber through the network. SGSN handles all the packet switched operations and transfers all the data in the network. In UMTS the MGW (Media gateway) will take care of all data transfer in both, circuit and packet switched networks. MSC and SGSN will act as "brains" of the system and they will control MGW operations. The name of the nodes will change into MSC-server and GSN-server.

[edit] Future network

When UMTS networks are in commercial use and users utilise the services, the capacity given by UMTS will need to be tested to ensure its sufficiency. Increasing WLAN capacity could be one potential cost-efficient solution, another being integration with UMTS. When so called "hot services" are found in UMTS, areas of demand for the network should be analysed for post-UMTS development, as it is hard to estimate which areas will experience the most demand.

UMTS, 3G Terminals

3G handsets usually include cameras, music players, video players, contactless smartcards for payment functions (wallet phones), web browsers, email clients and more. This shows that UMTS system is based on layered services and future applications can be supported without too much impact to the underlying radio access network.

UMTS Terminals - The future

The future of UMTS terminals sees a change coming. So far the UMTS technology in Europe has primarily been used in very similar terminals as the GSM technology. The UMTS terminals have been very closely linked with GSM phones in Europe. This factor is now slowly starting to change - and has not been the case in Japan and South Korea, where 3G introduction is several years ahead of Europe.

Issues

Even though 3G has successfully been introduced to European , Asian and North Africa mobile users, there are some issues that are debated by 3G providers and users:

  • High input fees for the 3G service licenses
  • Great differences in the licensing terms
  • Current high debt of many telecommunication companies, making it more of a challenge to build the necessary infrastructure for 3G
  • Member State support to the financially troubled operators
  • Health aspects of the effects of electromagnetic waves
  • Expense of 3G phones
  • Lack of 2G mobile user buy-in for 3G wireless service
  • Lack of coverage because it is still new service
  • High prices of 3G mobile services in some countries, including Internet access (see flat rate)


2G Means

2G (or 2-G) is short for second-generation wireless telephone technology.

The main differentiator to previous mobile telephone systems, retrospectively dubbed 1G, is that the radio signals that 1G networks use are analog, while 2G networks are digital. Note that both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system.

2G technologies

2G technologies can be divided into TDMA-based and CDMA-based standards depending on the type of multiplexing used. The main 2G standards are:

  • GSM (TDMA-based), originally from Europe but used worldwide (Time Division Multiple Access)
  • iDEN (TDMA-based), proprietary network used by Nextel in the United States and Telus Mobility in Canada
  • IS-136 aka D-AMPS, (TDMA-based, commonly referred as simply TDMA in the US), used in the Americas
  • IS-95 aka cdmaOne, (CDMA-based, commonly referred as simply CDMA in the US), used in the Americas and parts of Asia
  • PDC (TDMA-based), used exclusively in Japan

2G services are frequently referred as Personal Communications Service, or PCS, in the United States.

2.5G services enable high-speed data transfer over upgraded existing 2G networks. Beyond 2G, there's 3G, with higher data speeds, and 4G, with even higher data speeds, to enable new services for subscribers, such as picture messaging and video telephony.

Capacities, advantages, and disadvantages

Capacity

Using digital signals between the handsets and the towers increases system capacity in two key ways:

  • Digital voice data can be compressed and multiplexed much more effectively than analog voice encodings through the use of various CODECs, allowing more calls to be packed into the same amount of radio bandwidth.
  • The digital systems were designed to emit less radio power from the handsets. This meant that cells could be smaller, so more cells could be placed in the same amount of space. This was also made possible by cell towers and related equipment getting less expensive.

Advantages

Digital systems were embraced by consumers for several reasons.

  • The lower powered radio signals require less battery power, so phones last much longer between charges, and batteries can be smaller.
  • The digital voice encoding allowed digital error checking which could increase sound quality by reducing dynamic and lowering the noise floor.
  • The lower power emissions helped address health concerns.
  • Going all-digital allowed for the introduction of digital data services, such as SMS and email.

A key digital advantage not often mentioned is that digital cellular calls are much harder to eavesdrop on by use of radio scanners. While the security algorithms used have proved to not be as secure as initially advertised, 2G phones are immensely more private than 1G phones, which have no protection whatsoever against eavesdropping.

Disadvantages

The downsides of 2G systems, not often well publicized, are:

  • In less populous areas, the weaker digital signal will not be sufficient to reach a cell tower.
  • Analog has a smooth decay curve, digital a jagged steppy one. This can be both an advantage and a disadvantage. Under good conditions, digital will sound better. Under slightly worse conditions, analog will experience static, while digital has occasional dropouts. As conditions worsen, though, digital will start to completely fail, by dropping calls or being unintelligible, while analog slowly gets worse, generally holding a call longer and allowing at least a few words to get through.
  • Despite the coverage maps provided by major phone companies, as of 2006 digital coverage in many areas is spotty at best.
  • With analog systems it was possible to have two or more "cloned" handsets that had the same phone number. This was widely abused for fraudulent purposes. It was, however, of great advantage in many legitimate situations. One could have a backup handset in case of damage or loss, a permanently installed handset in a car or remote workshop, and so on. With digital systems, this is no longer possible.
  • While digital calls tend to be free of static and background noise, the lossy compression used by the CODECs takes a toll; the range of sound that they convey is reduced. You'll hear less of the tonality of someone's voice talking on a digital cellphone, but you will hear it more clearly.

Telecommunication

Wireless communication, despite the hype of the popular press, is a field
that has been around for over a hundred years, starting around 1897 with
Marconi’s successful demonstrations of wireless telegraphy. By 1901, radio
reception across the Atlantic Ocean had been established; thus, rapid progress
in technology has also been around for quite a while. In the intervening
hundred years, many types of wireless systems have flourished, and often
later disappeared. For example, television transmission, in its early days, was
broadcast by wireless radio transmitters, which are increasingly being replaced
by cable transmission. Similarly, the point-to-point microwave circuits that
formed the backbone of the telephone network are being replaced by optical
fiber. In the first example, wireless technology became outdated when a wired
distribution network was installed; in the second, a new wired technology
(optical fiber) replaced the older technology. The opposite type of example is
occurring today in telephony, where wireless (cellular) technology is partially
replacing the use of the wired telephone network (particularly in parts of
the world where the wired network is not well developed). The point of
these examples is that there are many situations in which there is a choice
between wireless and wire technologies, and the choice often changes when
new technologies become available.
In this book, we will concentrate on cellular networks, both because they are
of great current interest and also because the features of many other wireless
systems can be easily understood as special cases or simple generalizations
of the features of cellular networks. A cellular network consists of a large
number of wireless subscribers who have cellular telephones (users), that can
be used in cars, in buildings, on the street, or almost anywhere. There are
also a number of fixed base-stations, arranged to provide coverage of the
subscribers.
The area covered by a base-station, i.e., the area from which incoming
calls reach that base-station, is called a cell. One often pictures a cell as
a hexagonal region with the base-station in the middle. One then pictures
a city or region as being broken up into a hexagonal lattice of cells (see
Figure 1.1a). In reality, the base-stations are placed somewhat irregularly,
depending on the location of places such as building tops or hill tops that
have good communication coverage and that can be leased or bought (see
Figure 1.1b). Similarly, mobile users connected to a base-station are chosen
by good communication paths rather than geographic distance.
When a user makes a call, it is connected to the base-station to which it
appears to have the best path (often but not always the closest base-station).
The base-stations in a given area are then connected to a mobile telephone
switching office (MTSO, also called a mobile switching center MSC) by highspeed
wire connections or microwave links. The MTSO is connected to the
public wired telephone network. Thus an incoming call from a mobile user
is first connected to a base-station and from there to the MTSO and then to
the wired network. From there the call goes to its destination, which might
be an ordinary wire line telephone, or might be another mobile subscriber.
Thus, we see that a cellular network is not an independent network, but rather
an appendage to the wired network. The MTSO also plays a major role in
coordinating which base-station will handle a call to or from a user and when
to handoff a user from one base-station to another.
When another user (either wired or wireless) places a call to a given user, the
reverse process takes place. First the MTSO for the called subscriber is found,
then the closest base-station is found, and finally the call is set up through
the MTSO and the base-station. The wireless link from a base-station to the
mobile users is interchangeably called the downlink or the forward channel,
and the link from the users to a base-station is called the uplink or a reverse
channel. There are usually many users connected to a single base-station,
and thus, for the downlink channel, the base-station must multiplex together
the signals to the various connected users and then broadcast one waveform
from which each user can extract its own signal. For the uplink channel, each
user connected to a given base-station transmits its own waveform, and the
base-station receives the sum of the waveforms from the various users plus
noise. The base-station must then separate out the signals from each user and
forward these signals to the MTSO.
Older cellular systems, such as the AMPS (advanced mobile phone service)
system developed in the USA in the eighties, are analog. That is, a voice
waveform is modulated on a carrier and transmitted without being transformed
into a digital stream. Different users in the same cell are assigned
different modulation frequencies, and adjacent cells use different sets of frequencies.
Cells sufficiently far away from each other can reuse the same set
of frequencies with little danger of interference.
Second-generation cellular systems are digital. One is the GSM (global
system for mobile communication) system, which was standardized in Europe
but now used worldwide, another is the TDMA (time-division multiple access)
standard developed in the USA (IS-136), and a third is CDMA (code division
multiple access) (IS-95). Since these cellular systems, and their standards,
were originally developed for telephony, the current data rates and delays
in cellular systems are essentially determined by voice requirements. Thirdgeneration
cellular systems are designed to handle data and/or voice. While
some of the third-generation systems are essentially evolution of secondgeneration
voice systems, others are designed from scratch to cater for the
specific characteristics of data. In addition to a requirement for higher rates,
data applications have two features that distinguish them from voice:
• Many data applications are extremely bursty; users may remain inactive
for long periods of time but have very high demands for short periods of
time. Voice applications, in contrast, have a fixed-rate demand over long
periods of time.
• Voice has a relatively tight latency requirement of the order of 100 ms.
Data applications have a wide range of latency requirements; real-time
applications, such as gaming, may have even tighter delay requirements
than voice, while many others, such as http file transfers, have a much
laxer requirement.

3 Challenges

treasure, throne and wanita…this is 3 challenge to every person in this is world…terkadang we are lost in because treasure, haughty because throne, and lose he because woman but rather than we must ngejauhin, actually 3 things this is that must we GET… chase here the purpose get baik…. why? ? coz because 3 this matters is human soes has enthusiasm external (outdoor internal, about heaven, paradise and hell)…so this must be reachesed best between baik…tp remember 3 this matters sebener datng kalo we then will try our ability capacity increase and out for will be human most rewarding for person lain…. and honestly to every man practically from 3 this matters is matter IS WOMAN is thedifficultest, usually this matter leaders weakness. . example when does japanese want to enter keindonesia in order brother karno. . brother karno loud laugh averses but with goddess weapon soekarno crushed also hatinya…actually turned keperkasaan president soeharto permanent the pilot is mother tien soeharto……so watch out guys

3 A key of success

this 3A Will be somebody authorized capital to be person "Big"….
first A is acceptable, how to so that we are dpt accepted by various society
element with
character heterogen…or our attitude
second A is asset, asset this not 2 things matter but capacity in our self. .
there 3 matters that represent asset: belied, science and charity
the third A is access, access this how many we associate to /have link towards
person 2 great. . coz
uliginous human depends on environment . water
if reside in in gutter smell and can not. . but

if reside in glass so mean water clean and drinkable. . and so it is with
human that depend on
their environment presents. .
ok enough for this is time bye

and wskm

2 Things

there 2 matters that must we remember that is our error and person kindness
but,
there 2 matters that must we forget that is our kindness and person error
Do you Agree ?