MultiMedia Message Service: Multimedia Message Service: SMS service
WML (Wireless Markup Language): Wireless tag language (mobile phone that supports WAP technology can browse the Internet content described by WML)
GPRS (General Packer Radio Service): General Wireless Packet Business GSM (Global System for Mobile Communications): Mobile Communication Global System CDMA (Code Division Multiple Access): Code Division Multiple Access
WAP (Wireless Application Protocol): Wireless Application Protocol ISMG (Internet Short Message Gateway): Internet SMS Gateway SMPP (Short Message Peer to Peer): SMS Point Association
CMPP (China Mobile Peer to Peer): China Mobile Point Association SMGP: (Telecom) SMS Agreement SGIP: (China Unicom) SMS protocol CNGP: (Netcom) SMS protocol
SIM (Subscriber Identity Module): General User Recognition Module STK (Sim Card Tool Kit): User Identification Application Development Tool
==============================================
Mobile CMPP / Unicom SGIP / Netcom CNGP / Telecom SMGP / Mobile Small Payment MPCP
==============================================
==============================================
WAP is a wireless application agreement established by Ericsson, Nokia, Motorola (Motorola).
Wap forum
The WAP protocol includes the following layers:
Wireless Application Environment (WAE) Wireless Session Layer (WIRELESS TRANSPORT LAYER Security (WTLS) Wireless Transport Layer (WTP)
================================================== Advantage?
GPRS has access to 171.2kbps, GPRS has access to 171.2kbps; GSM needs 10-3 in terms of connection establishment time.
0 seconds, while GPRS only needs to be extremely short time, you can access the relevant request; for the fee, GSM is charged according to the connection time, while GPRS only needs
To charge according to data traffic; GPRS is relatively much higher than GSM for the utilization of network resources.
==============================================
What does GPRS WAP mean?
A: GPRS and WAP portfolio is the best implementation of the current "mobile Internet" to the new step: GPRS is a powerful underlying transmission, WAP is used as
High-level applications, if WAP is more than a flying vehicle, then GPRS is a wide and unblocked highway, and you are free to gallop in wireless information world.
.
==============================================
GPRS outstanding advantages?
(1) High-speed data transmission (2) Forever online (3) is only charged according to data traffic
==============================================
CDMA:
The mobile communication system has a variety of classification methods. According to the signal properties, it can be divided into simulation, numbers; according to the modulation method, can be divided into FM, phase correction, adjustment
Wide; according to the multiple access method, it can be divided into Frequency Division Multiple Access (FDMA), Time Multiple Access (TDMA) and Code Multiple Access (CDMA).
CDMA is the English abbreviation of the code division multiple access, which is a branch of digital technology - spreading communication technology
A new and proloned wireless communication technology developed in the operation.
The principle of CDMA technology is based on spread spectrum technology, which is about to be transmitted with a bandwidth of the bandwidth to be high than the signal bandwidth.
The speed fake random code is modulated, so that the bandwidth of the original data signal is expanded, and the carrier is modulated and transmitted. The receiving end uses a fully identical pseudo-random code, and the narrowband signal is replaced by the wideband signal to the original information data to achieve information communication.
==============================================
3G is English 3RD
The abbreviation of Generation refers to the third generation of mobile communication technology. Relative to the first generation of simulated system (1G) and second generation GSM, TDMA and other digital mobile phones (2G
), The third generation of mobile phones generally refer to a new generation of mobile communication systems that combine multimedia communication such as wireless communications and international Internet. It can handle images,
Music, video streams and other media forms provide a variety of information services including web browsing, conference calls, e-commerce. In order to provide this service,
Wireless networks must support different data transfer speeds, that is, can support at least 2 megaws in indoor, outdoor and driving environments
Section / 384 kilobytes per second and 144 kilobytes / transmission speed per second.
Frequency planning:
The 3G mobile communication band planning of the European Union is assigned to WCDMA, 1900m to 1920m, a symmetrical frequency of 1920m to 1980m, 2110m and 2170mM.
The asymmetric frequency of 2010m to 2025m is assigned to the asymmetric mode, bundle the operator with the frequency of WCDMA.
Japan will divide from 1920m to 1980m, 2110m to 2170m to CDMA2000 and WCDMA, which also will also also collect unstruthful frequency of 2010m to 2025m.
The rate is assigned to the TDD mode. South Korea is basically similar to Japan's model.
The United States and Canada are more complicated, but the basic spirit is still deploying CDMA2000 and WCDMA as much as possible in 1920m to 1980m.
