Third-Generation(3G) Wireless system

Chapter 25: Thrird-Generation(3G) Wireless system

First Generation Phones
The very first mobile phones are now referred to as first generation (1G) mobile phones. The first handheld phone to be released on the us market was the Motorola DynaTAC 8000X in 1983. Mobile phones started to gain popularity in the eighties with the introduction of cellphones that were based on cellular networks. 
Mobile phones were originally much larger than current ones, & they were initially designed for installation in vehicles only, which is why they were called the car phone. These chunky units were later converted for use as transportable phones the size of a small suitcase & the rest is history.

Second Generation Phones

Second generation, also called 2-G, mobile telephones were introduced in the nineties. 2-G telephone systems were different because of their use of digital circuit switched transmission & the introduction of advanced & quick telephone to network signals. The introduction of 2-G systems saw telephones move from historic 1G telephones to small hand held items, which were much more portable. This change was made possible through improvements in technology such as more advanced batteries &Second Generation Phones

Second generation, also called 2-G, mobile telephones were introduced in the nineties. 2-G telephone systems were different because of their use of digital circuit switched transmission & the introduction of advanced & quick telephone to network signals. The introduction of 2-G systems saw telephones move from historic 1G telephones to small hand held items, which were much more portable. This change was made possible through improvements in technology such as more advanced batteries & energy efficient electronics. 

The second generation mobile telephones had several advantages over 1G items. These included SMS messaging, which initially became possible on GSM networks & eventually on all digital networks. The very first machine-sent message was sent in Great Britain in 1991. The very first person-to-person SMS text message was sent in 1993 in Finland. SMS text messaging soon became the communication method of choice & the general public now prefer sending messages to placing voice calls.

The first pre-commercial 3-G mobile phone network was launched in Japan in May of 2001. 3G was later commercially released in Japan on October, 1 2001.

3-G is the third generation of mobile phone standards & technology, which succeeded 2-G mobile technology. The birth of 3-G technologies enabled network operators including orange to give their users a wider range of advanced services. This includes broadband internet, in addition to high-tech video calls.

Despite the success of 3-G, there has also been many complaints about it. These include criticism over the cost of 3G phones, a lack of network coverage because it's still a new service & the high power usage of 3G phones.

Ever since the launch of 3G mobile telephone technology, people have been discussing 4-G. 4-G technology will signify the future of mobile telephones, producing the most advanced handsets & best services to date. In actual fact, one of the next services to be developed is thought to be the live streaming of radio and television shows to 3G handsets is & businesses including Disney & Real recently announced that they'll be offering services like these. electronics. 

The second generation mobile telephones had several advantages over 1G items. These included SMS messaging, which initially became possible on GSM networks & eventually on all digital networks. The very first machine-sent message was sent in Great Britain in 1991. The very first person-to-person SMS text message was sent in 1993 in Finland. SMS text messaging soon became the communication method of choice & the general public now prefer sending messages to placing voice calls.


The first pre-commercial 3-G mobile phone network was launched in Japan in May of 2001. 3G was later commercially released in Japan on October, 1 2001.

3-G is the third generation of mobile phone standards & technology, which succeeded 2-G mobile technology. The birth of 3-G technologies enabled network operators including orange to give their users a wider range of advanced services. This includes broadband internet, in addition to high-tech video calls.

Despite the success of 3-G, there has also been many complaints about it. These include criticism over the cost of 3G phones, a lack of network coverage because it's still a new service & the high power usage of 3G phones.

Ever since the launch of 3G mobile telephone technology, people have been discussing 4-G. 4-G technology will signify the future of mobile telephones, producing the most advanced handsets & best services to date. In actual fact, one of the next services to be developed is thought to be the live streaming of radio and TV shows to 3G handsets is & businesses including Disney & Real recently announced that they'll be offering services like these.

What is 3G?



3G refers to the third generation of mobile telephony (that is, cellular) technology. The third generation, as the name suggests, follows two earlier generations.

The first generation (1G) began in the early 80's with commercial deployment of Advanced Mobile Phone Service (AMPS) cellular networks. Early AMPS networks used Frequency Division Multiplexing Access (FDMA) to carry analog voice over channels in the 800 MHz frequency band.

The second generation (2G) emerged in the 90's when mobile operators deployed two competing digital voice standards. In North America, some operators adopted IS-95, which used Code Division Multiple Access (CDMA) to multiplex up to 64 calls per channel in the 800 MHz band. Across the world, many operators adopted the Global System for Mobile communication (GSM) standard, which used Time Division Multiple Access (TDMA) to multiplex up to 8 calls per channel in the 900 and 1800 MHz bands.

The International Telecommunications Union (ITU) defined the third generation (3G) of mobile telephony standards IMT-2000 to facilitate growth, increase bandwidth, and support more diverse applications. For example, GSM could deliver not only voice, but also circuit-switched data at speeds up to 14.4 Kbps. But to support mobile multimedia applications,

3G had to deliver packet-switched data with better spectral efficiency, at far greater speeds.

However, to get from 2G to 3G, mobile operators had make "evolutionary" upgrades to existing networks while simultaneously planning their "revolutionary" new mobile broadband networks. This lead to the establishment of two distinct 3G families: 3GPP and 3GPP2.

The 3rd Generation Partnership Project (3GPP) was formed in 1998 to foster deployment of 3G networks that descended from GSM. 3GPP technologies evolved as follows.

• General Packet Radio Service (GPRS) offered speeds up to 114 Kbps.

• Enhanced Data Rates for Global Evolution (EDGE) reached up to 384 Kbps.

• UMTS Wideband CDMA (WCDMA) offered downlink speeds up to 1.92 Mbps.

• High Speed Downlink Packet Access (HSDPA) boosted the downlink to 14Mbps.

• LTE Evolved UMTS Terrestrial Radio Access (E-UTRA) is aiming for 100 Mbps.

GPRS deployments began in 2000, followed by EDGE in 2003. While these technologies are defined by IMT-2000, they are sometimes called "2.5G" because they did not offer multi-megabit data rates. EDGE has now been superceded by HSDPA (and its uplink partner HSUPA). According to the 3GPP, there were 166 HSDPA networks in 75 countries at the end of 2007. The next step for GSM operators: LTE E-UTRA, based on specifications completed in late 2008.

A second organization, the 3rd Generation Partnership Project 2 (3GPP2) -- was formed to help North American and Asian operators using CDMA2000 transition to 3G. 3GPP2 technologies evolved as follows.

• One Times Radio Transmission Technology (1xRTT) offered speeds up to 144 Kbps.

• Evolution Data Optimized (EV-DO) increased downlink speeds up to 2.4 Mbps.

• EV-DO Rev. A boosted downlink peak speed to 3.1 Mbps and reduced latency.

• EV-DO Rev. B can use 2 to 15 channels, with each downlink peaking at 4.9 Mbps.

• Ultra Mobile Broadband (UMB) was slated to reach 288 Mbps on the downlink.

1xRTT became available in 2002, followed by commercial EV-DO Rev. 0 in 2004. Here again, 1xRTT is referred to as "2.5G" because it served as a transitional step to EV-DO. EV-DO standards were extended twice – Revision A services emerged in 2006 and are now being succeeded by products that use Revision B to increase data rates by transmitting over multiple channels. The 3GPP2's next-generation technology, UMB, may not catch on, as many CDMA operators are now planning to evolve to LTE instead.

In fact, LTE and UMB are often called 4G (fourth generation) technologies because they increase downlink speeds an order of magnitude. This label is a bit premature because what constitutes "4G" has not yet been standardized. The ITU is currently considering candidate technologies for inclusion in the 4G IMT-Advanced standard, including LTE, UMB, and WiMAXII. Goals for 4G include data rates of least 100 Mbps, use of OFDMA transmission, and packet-switched delivery of IP-based voice, data, and streaming multimedia.