Glossary
1.1g / 2g / 2.5g / 3g, GSM, GPRS, UTMS, CDMA. 2. WAP and WML, I-Mode and Chtml. 3. Bluetooth, Wireless Lan, Homerf. 4. Syncml, VoiceXML. 5. Java, J2EE ...
----------- What is 1G / 2G / 2.5G / 3G
1G (first generation) represents the first generation of mobile communication technology. Such as the mimetion of the mobile network is now eliminated.
2G (Second Generation) represents the second generation of mobile communication technology. The representative is GSM. Digital voice pass
Load technology is the core.
2.5g is a transition type based on 2G and 3G. The representative is GPRS. Raise the speed and bandwidth than 2G
. A simple access to high-speed data packets can be easily implemented with high-speed data packets.
3G (third generation) represents the third generation of mobile communication technology. High-speed, broadband data transmission.
International Telecommunications Union (ITU) is called IMT-2000 (International Mobile Telecom-Munications). Up to 2Mbp / s data transfer rate can be provided. Mainstream technology represents CDMA technology representatives with WCDMA (European, Japan), CDMA2000 (US) and TD-SCDMA.
----------- What is GSM
English abbreviation between global mobile communication system (Global System for Mobile Communications).
2G mainstream technology, data rate is 9.6kb / s.
----------- What is GPRS
General Packet Radio Service (General Packet Radio Service) English abbreviation. A kind of
Wireless packet switching technology of the GSM system. It is a mainstream technology of 2.5G. Theoretical maximum data rate is 171.2
Kb / s.
----------- What is UMTS
UMTS (Universal Mobile Telecommunication System) Universal Mobile Communication System
abbreviation. The European Telecommunication Standards Association (ETSI) is responsible for the standardization of UMTS. IMT-responsible with ITU-
2000 coordination. It is an important part of ITU IMT-2000. UMTS uses ITU allocation for land
Ground and satellite wireless communication frequency band. It can access by mobile or fixed, public or private network, with GSM
Compatible with IP. 2MB / s data rate can be supported.
----------- What is CDMA (Note: Here: 3G CDMA)
The English abbreviation of the code division multi site is currently recognized 3G mainstream technology.
There are currently three 3G mainstream CDMA standards, which are WCDMA, CDMA2000, and TD-SCDMA. Before the two
It is not proposed by Europe and the United States, and TD-SCDMA is proposed by China (Datang Telecom), has been accepted by ITU and 3GPP. Where WCDMA and CDMA2000 are FDD mode, and TD-SCDMA is TDD mode (Note: FDD-frequency division double
Workers, you need to send and receive two frequency bands; TDD-time division duplex, use the same frequency band, but with different time slots
get on. )
----------- WAP and WML
WAP is an abbreviation for wireless application protocol (Wireless Application Protocal). It is wireless mutual
A combination of a series of protocols on the Internet. Small, narrowband mobile devices such as mobile phones. WAP can
Running over a variety of wireless networks such as GSM, GPRS, CDMA, etc.
WML is an abbreviation for Wireless Makeup Language. A hand-to-hand of WAP technology can browse the Internet content described by WML.
----------- I-MODE and Chtml
I-MODE is a wireless communication service in Japan's Telecom (NTT)'s subsidiary DOCOMO in the Japanese market. Be
The number of people used in the former world (all in Japan) wireless Internet services. Main of I-MODE and WAP
The difference between: i-mode is written in chtml, so the current most network content is only slightly
Make modifications can be used; WAP is WML, existing network content must be converted to WML to be WAP
Use.
A variant of HTML in chtml (Compact HTML). Most of the HTML is mostly compatible.
(Note: I suggest you go to www.nttdocomo.com to see, very COOL.)
----------- Bluetooth (Bluetooth)
Bluetooth is a radio technology that supports short-range communication (typically within 10m). Can include mobile
Wireless information exchange between telephone, PDA, wireless headset, laptop, related peripherals, etc.
. Its standard is IEEE802.15. Work at 2.4HGZ band. Bandwidth is 1MB / s
(Note: The name of Bluetooth is very interesting, from the name of Scandinavian king of Denmark and Sweden, the 10th century, Sweden.)
----------- Wireless Lan
Wireless LAN is developed by the LAN, the standard is IEEE802.11, IEEE802.11b and IEEE
802.11a. Among them, 802.11b operate at 2.4 GHz band with bandwidth of 11 Mbps. And 802.11a is defined
5GHz frequency band, bandwidth is expected to reach 54MB / s. However, accordingly, Wireless LAN is costly, and it is expensive.
---------- Homerfhomerf mainly designed wireless RF technology for home networks, is the combination of IEEE802.11 and DECT, aimed at
reduce costs. Homerf also uses spread spectrum technology, working in 2.4GHz band, current Homerf's bandwidth is
1 ~ 2MB / s, the future will increase to 10MB / s.
----------- Syncml
Syncml is a universal mobile data synchronization protocol. Use Syncml to make the number of mobile devices
It is maintained with the remote data. Ericsson, IBM, Lotus, Matshita,
Association of Motorola, Nokia, Palm, Psion and Starfish Software
hair.
----------- VoiceXML
VoiceXML (Voice EXTENSIBLE MARKUP LANGUAGE) is a Scalable tag language defined by W3C
(XML), an extension, according to the played prompt information, the oral command, voice or button sound input,
Realize human-computer interaction. The standardization of VoiceXML will simplify the personalized interface with voice response service on the Web.
Creation enables people to access information and services on the website via voice and calls.
---------------- UMTS
Universal Mobile Telecommunications System. General Wireless Communication System English Abbreviation.
Is one of the components of ITU IMT-2000. UMTS is assigned by ITU, used for land and satellite wireless
The belt of the letter. It can be compatible with GSM and IP by moving or fixed, public or private network access. stand by
The data rate of 2Mb / s. Future can reach higher.
----------------- Iden
(The Integrated Digital Enhanced Network) Integrates Digital Enhanced Networks. Motorcycle
Digital cluster wireless network system developed by Rolla. The world's largest IdeN net is operated by NEXTEL in the United States.
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----------------- PHS and PDC
PHS (Personal Handyphone System) Personal Handheld System, PDC (Personal Digital Cellular) Personal Digital Honeycomb
PHS and PDC are all special mobile communication systems for Japan
--------------- i-appli
Also known as "Java for I-MODE", I-Appli is NTT Docomo's proprietary J2ME-CLDC application,
That is, NTT Docomo version of MIDlet.
--------------- Java
Java is a programming language in SUN launched in 1996. Java technology is one of the most important technologies that have emerged in the 20th century. This language-independent language leads to a revolution in the programming world. At present, Java is one of the most popular programming languages on the Internet. It is a language, grammar rules, and C that perform by explaining.
J2EE, Java 2 Platform, Enterprise Edition (J2EE) is an Enterprise Edition of the Java platform.
When JDK was released in 1998, Sun used the new name Java 2 Platform called the "Java Platform". The modified JDK called J2SDK, Java 2 (Platform) SoftwareeDevelPing Kit, and points Standard Edition, also known as J2SE, Enterprise Edition, also known as J2EE, microReition, also known as J2ME. They have different purposes, but the most basic development kit is J2SE. At present, Java2 has three versions: J2EE (Enterprise Edition), J2SE (Standard Edition), J2ME (Mini)
1, J2SE (Java2 Standart Edition) Java2 Standard Edition supports the core class function library defined in all Java standard specification and all Java basic categories. J2SE is positioned on the application of the client program.
2, J2EE (Java2 Enterprise Edition) Java2 Enterprise Edition adds support for the internal extension class function library on J2SE, such as supporting servlet / JSP Javax.Servletr. * And Enterprise Java Bean's javax.ejb. * Library. J2EE is located on the application of the server-side program.
3, J2ME (Java 2 Micro Edition) Java2 micro version only supports subset of core class function libraries defined in the Java standard specification. For example, in the J2ME CLDC specification, only java.lang. *, Java.io. *, and java.util. * Class function library. And some extended class functions that support embedded systems are added, such as: javax.meicroedition.io. * Class function library. But do not support all Java basic classes. J2ME is positioned in an embedded system.
4, Smart Card Java Smart Card Java only supports java.lang in the core class function library. *. But there is a dedicated extension class function library, such as Javacard. *, Javacardx. *. Only two BYTE two Java basic classes are supported by Boolean. Positioned on the smart card.
5, KVM (K Virtual Machine) J2ME virtual machine is used to perform a Spotlet or MIDlet. Different versions of Java have different virtual machines to run Java Applet, Java Servlet, or Java Application. And the virtual machine is not only Sun, such as the J9 VM of IBM.
6. Jini is used to connect different versions of Java programs to achieve the purpose of resource sharing.
7. CLDC (Connected Limited Device Configuration) SUN divides the J2ME's application entity into two categories, and proposes the concept of the corresponding Confiution. This specification is applied to the computing power, and the power supply is limited. Such as: PDA, mobile phone. Support java.lang. *, Java.io. *, and java.util. * Class function library, and support the extended class function library javax.meicroedition.io. *.
8, CDC (Connected Device Configuration) This specification is applied to relative calculation capabilities, and the power supply is better. Such as: refrigerator, TV set top box, etc.
9. MIDP (Mobile Information Device Profile) On the basis of Confitration specification, there is a clear zone to divide the Java program development specification for various embedded devices. This specification is very relevant to a particular embedded device, defining the extended class function library associated with specific hardware. Applications / Oem Specific APIS | Profile | Confiuration / VM | Operating System | Hardware 10, STK (SIM Toolkit) Mobile Phone Company cooperates with SIM card manufacturer to write program in the SIM card to achieve value-added services. It is the application of Java on Smart Card. For example, China Mobile's new motion zone is the 64K STK card.
11, OTA (over the air) user directly downloads the information of the telecommunications.
