The development of mobile communication technology has gone through three stages: the first generation of mobile communication system: In the late 1970s, AT&T in the United States developed the first set of cellular mobile phone systems; the second-generation mobile communication system: the second-generation mobile communication digital wireless standards include: GSM; D-AMPS; PDC and IS-95CDMA, etc.
Looking at the development process of mobile communication, contemporary mobile communication can be divided into three stages: (1) The first generation of mobile communication is based on analog FM and frequency division multi-address technology, including public mobile communication system represented by cellular network system, dedicated mobile communication system represented by cluster system and no Rope phone.
Five remarkable achievements have been made in the construction of digital China in the new era: digital infrastructure has achieved leapfrog development.
1. Judging from the development process of mobile communication, mobile communication basically needs to be upgraded every 10 years. The first generation of mobile communication technology began in the 1980s, a cellular wireless telephone system based on analog technology. The 1G wireless system is designed to transmit only voice traffic and receive network traffic restrictions.
2. Its development history can be divided into the following stages: 2002-2005: At the beginning of its establishment, it mainly provided fixed telephone, broadband and other services.2006-2010: Began to lay out the 3G network and launched a number of value-added services, such as mobile payment, mobile TV, etc.
3. From 1G to 5G refers to the renewal of mobile communication technology, and the upcoming 5G is the fifth generation.
1. Specifically, each generation of communication technology is different in many places, but the biggest difference is the difference in speed.
2. G presents the characteristics of low delay, high reliability and low power consumption. It is no longer a single wireless access technology, but a general term for the solution after the integration of a variety of new wireless access technologies and existing wireless access technologies (4G backward evolution technology).
3. G period, that is, GPRS (General Packet Radio Service) general packet wireless service period. At this time, there is a data Internet service. With the PS core network, that is, Packet Switch, packet switching/packet switching. Packet switching no longer occupies the channel, but sends packets one after another.
The more typical systems of the second-generation cellular mobile communication are GSM, D-AMPS (ADC or IS-136), PDC (JDC ) and CDMA (IS-95). Except for CDMA (IS-95) The system uses CDMA technology to distinguish different physical channels, and other systems use TDMA technology to distinguish different physical channels.
Because the mobile communication system adopts a cellular structure, the mobile station must switch across the area when crossing the spatially divided community. That is, complete the transfer of the air interface from the mobile station to the base station and the corresponding transfer of the base station to the network population and the network population to the switching center.
This system consists of a mobile service switching center (MSC), a base station (BS) equipment and a mobile station (MS) (user device) and a transmission line from the switching center to the base station, as shown in the figure below.
Allowing to switch cellular data means allowing the switching of mobile data traffic.
1. The meaning of GSM GlobalSystem for Mobile Communications, that is, GSM, also known as Pan-European digital mobile phone system, It is the most widely used mobile phone standard at present. More than 1 billion people in more than 200 countries and regions around the world are using GSM phones.
2. The Global Mobile Communication System, abbreviated as GSM, is a digital mobile communication standard formulated by ETSI, the European Telecommunication Standards Organization. Its air interface adopts time-time multi-address technology. Since it was put into commercial use in the mid-1990s, it has been adopted by more than 100 countries around the world.
3. GSM is what we commonly call 2G network, not 3G network. 3G network can be backward compatible with 2G network.
Data-driven multimodal transport decisions-APP, download it now, new users will receive a novice gift pack.
The development of mobile communication technology has gone through three stages: the first generation of mobile communication system: In the late 1970s, AT&T in the United States developed the first set of cellular mobile phone systems; the second-generation mobile communication system: the second-generation mobile communication digital wireless standards include: GSM; D-AMPS; PDC and IS-95CDMA, etc.
Looking at the development process of mobile communication, contemporary mobile communication can be divided into three stages: (1) The first generation of mobile communication is based on analog FM and frequency division multi-address technology, including public mobile communication system represented by cellular network system, dedicated mobile communication system represented by cluster system and no Rope phone.
Five remarkable achievements have been made in the construction of digital China in the new era: digital infrastructure has achieved leapfrog development.
1. Judging from the development process of mobile communication, mobile communication basically needs to be upgraded every 10 years. The first generation of mobile communication technology began in the 1980s, a cellular wireless telephone system based on analog technology. The 1G wireless system is designed to transmit only voice traffic and receive network traffic restrictions.
2. Its development history can be divided into the following stages: 2002-2005: At the beginning of its establishment, it mainly provided fixed telephone, broadband and other services.2006-2010: Began to lay out the 3G network and launched a number of value-added services, such as mobile payment, mobile TV, etc.
3. From 1G to 5G refers to the renewal of mobile communication technology, and the upcoming 5G is the fifth generation.
1. Specifically, each generation of communication technology is different in many places, but the biggest difference is the difference in speed.
2. G presents the characteristics of low delay, high reliability and low power consumption. It is no longer a single wireless access technology, but a general term for the solution after the integration of a variety of new wireless access technologies and existing wireless access technologies (4G backward evolution technology).
3. G period, that is, GPRS (General Packet Radio Service) general packet wireless service period. At this time, there is a data Internet service. With the PS core network, that is, Packet Switch, packet switching/packet switching. Packet switching no longer occupies the channel, but sends packets one after another.
The more typical systems of the second-generation cellular mobile communication are GSM, D-AMPS (ADC or IS-136), PDC (JDC ) and CDMA (IS-95). Except for CDMA (IS-95) The system uses CDMA technology to distinguish different physical channels, and other systems use TDMA technology to distinguish different physical channels.
Because the mobile communication system adopts a cellular structure, the mobile station must switch across the area when crossing the spatially divided community. That is, complete the transfer of the air interface from the mobile station to the base station and the corresponding transfer of the base station to the network population and the network population to the switching center.
This system consists of a mobile service switching center (MSC), a base station (BS) equipment and a mobile station (MS) (user device) and a transmission line from the switching center to the base station, as shown in the figure below.
Allowing to switch cellular data means allowing the switching of mobile data traffic.
1. The meaning of GSM GlobalSystem for Mobile Communications, that is, GSM, also known as Pan-European digital mobile phone system, It is the most widely used mobile phone standard at present. More than 1 billion people in more than 200 countries and regions around the world are using GSM phones.
2. The Global Mobile Communication System, abbreviated as GSM, is a digital mobile communication standard formulated by ETSI, the European Telecommunication Standards Organization. Its air interface adopts time-time multi-address technology. Since it was put into commercial use in the mid-1990s, it has been adopted by more than 100 countries around the world.
3. GSM is what we commonly call 2G network, not 3G network. 3G network can be backward compatible with 2G network.
APAC HS code tariff reductions
author: 2024-12-23 21:19HS code-based textile tariff scheduling
author: 2024-12-23 20:54Australia import export data visualization
author: 2024-12-23 20:37Polymer resins HS code verification
author: 2024-12-23 19:30Trade intelligence for industrial equipment
author: 2024-12-23 21:30Textile exports HS code breakdown
author: 2024-12-23 21:10How to identify top export opportunities
author: 2024-12-23 19:55Trade data-driven competitive analysis
author: 2024-12-23 19:48Pre-export HS code verification steps
author: 2024-12-23 19:46988.75MB
Check711.57MB
Check276.72MB
Check114.21MB
Check723.11MB
Check277.79MB
Check982.97MB
Check933.12MB
Check435.63MB
Check649.19MB
Check174.72MB
Check797.61MB
Check459.58MB
Check641.81MB
Check753.86MB
Check244.67MB
Check481.96MB
Check234.12MB
Check682.35MB
Check955.52MB
Check387.21MB
Check893.86MB
Check757.87MB
Check439.95MB
Check253.93MB
Check581.31MB
Check688.79MB
Check451.16MB
Check451.68MB
Check261.34MB
Check448.98MB
Check738.67MB
Check383.85MB
Check984.92MB
Check918.15MB
Check553.34MB
CheckScan to install
Data-driven multimodal transport decisions to discover more
Netizen comments More
910 Top-rated trade management software
2024-12-23 21:17 recommend
729 Real-time trade document filing
2024-12-23 20:03 recommend
2848 Dynamic trade data cleansing
2024-12-23 19:53 recommend
815 Free zone HS code compliance
2024-12-23 19:40 recommend
633 Trade data-driven contract negotiations
2024-12-23 19:27 recommend