The evolution of mobile phone
, the development of mobile phone We divide the development of mobile phones is Generation started, and 1G 2G 3G
.The evolution of mobile phone
, the development of mobile phone We divide the development of mobile phones is Generation started, and 1G 2G 3G
.The evolution of mobile phone
, the development of mobile phone We divide the development of mobile phones is Generation started, and 1G 2G 3G
.The 1 G or First Generation is the use negative analogue signals. By mixing the sound waves in the radio signal can be used for voice (Voice) alone does not support to pass any other information. The sound quality is not good. Phone, bulky sizeThe 2 G introduced about 1990 changed to send analog radio to send digital encoding. Start has the ability to use the send and receive data, but data is small, such as short messages (SMS - Short Message Service).1980 quantity are also very low. Most of them are located in the business circle
.
Figure 1.2 mobile era 1G
.The image Graphic Wall paper, most of which are monochrome. A low resolution
standard used in mobile phones, the 2 is
1.GSM - Global System for Mobile Communication is the main standards in Europe and Asia around the start of 160. Only one telephone number can be used all over the world (Roaming) used across the network
2.160 letters efficiency transfer was developed to better gradually can route to เชื่อมก and base station (Cell site) mobile phone starts dropping. Make more users have started to download Ring tone, a monotoneCDMA - Code Division Multiple Access popular in America and South Korea. The user can use the phone over the network. Sound quality and data signals have a better quality GSM
2 era.5 G era between 2G with 3G technology GPRS (General Packet Radio Service) occur in this age
.With a top speed of data transfer to 115 Kbps but in practice, the speed of the GPRS is limited to approximately 40 Kbps only. Begin to use in Data SMS become more MMS Ringtone became Polyphonic True, and tone
before entering the 3G technology is used EDGE (Enhanced Data rates for Global Evolution) some called informally, the era 2.The 3G or Third Generation is a wireless connection with a high speed. With 2 frequency electromagnetic wave.75G EDGE is technology sales. GPRS to improve the quality of the basis of speed GPRS to speed traffic rise about 3 as
.1 GHz is 2 standard is a new technology called Universal Mobile Telecommunication Systems (UMTS) somewhere called. WCDMA (Wideband Code Division Multiple Access), which develop from the GSM and another standard is CDMA2000 technology developed from the network. CDMA
.Access to the wireless network can act with a variety of equipment such as computers and other electrical appliances Can link with the Internet completely. Data transfer speed is from 384 Kbps until 2.Sufficient to send and receive data type multimedia or multimedia can send and receive files larger download song, see TV Streaming and meeting. Video Conference future E learning turns M learning or Mobile learning when we open the phone system, 3G
the sequence of events about the system 3G)
- first year 2540 units with control over the telecommunication business in the 3 organization is 1. Post and telegraph department. As government agencies 2.Tot is a phone service enterprises, domestic and 3.The communications authority of a state to provide international phone calls and other media such as the Internet สารชนิ ed by the three units. Under the Ministry of transport
.- the constitution of 2540 provisions in section 40 the enterprise to the government. Take care of broadcasting and telecommunications. The drafting and promulgation of the law.B.Professor 2543 had established the NTC (National Telecommunications Commission (NTC) The National Telecommunications Commission). R.(the national television and broadcasting Affairs). Later, there was a change to the system frequency system. "A concession license" or License instead due to the post and telegraph Department moved together with The NTC.And split the post office, a company goes to Thai Co., Ltd
.- 3 October 2545 was announced the new Thai government reform (Thaksin Shinawatra as Prime Minister) has set up a Ministry of new, more. Several ministries, including the Ministry of information and communication technology.
- 14 August 2008.2546 the authority was processed into Cat Telecom Company Limited (CAT) which has 100% by finance shares are obliged to international telephone service. And the other communication, such as Internet
.Was moved under the turf instead
.- the 1 JulyThe two companies acting as a telecommunication service provider only. Mobile phone services, both TOT CAT and open to the private auction spectrum for mobile phone with TOT has
.2548 separate processing of a tot tot Limited (TOT) when โดยมีหน้า to telephone service in domestic telecommunication system using a franchise. The TOT CAT monopoly and only 2.To make concessions to the company AIS frequency and frequency CAT gave concessions to the company and the DTAC TRUE duties in the supervision and allocate frequencies were transferred to the with The NTC
- if, according to the plan of the auction system 3G NTCIn the middle of 2552 have licensing 4 leaves. The operators 3 old leaves, which were AIS and DTAC TRUE and new entrepreneurs again 1 TOT CAT leaf and which is in the form of company of the state. Have no right to join the bid according to the norm, the NTC.
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