EDGE(Enhanced Data Rate for GSM Evolution)

EDGE is Enhanced Data Rate for GSM Evolution acronym, that is Enhanced Data Rates for GSM Evolution. EDGE is a transition from GSM to 3G technology, it is mainly used in the GSM system, a new modulation method, that is the most advanced multi-slot operation and 8PSK modulation. Because 8PSK can be used in the existing GSM network GMSK modulation symbols carrying information space extended from 1 to 3, so that the information contained in each symbol is 3 times the original. There the same name gladiator Edge.Brief Description ofThe reason that EDGE to GPRS to the third generation mobile communication technology transition program (GPRS commonly known as 2.5G, EDGE commonly known as 2.75G., 3G Needless to say it), mainly because the technology to fully utilize the existing GSM resources. Because in addition to the use of existing GSM frequency, and also use most of the existing GSM equipment, but only on the network software and hardware to do some minor modifications, it enables operators to provide mobile users such as Internet browsing , video teleconferencing and high-speed wireless multimedia services such as e-mail transmission, that is the third generation mobile network in advance of the commercialization of multimedia communications for the user to provide personal services. Because EDGE is a range of existing second-generation mobile networks and third-generation mobile networks the transition between the technology, than the "second half" GPRS technology is more excellent, so some people call it "2.75 generation" technology. EDGE can also coexist with the future of the WCDMA standard, which is the flexibility it has advantages. EDGE technology mainly affect the existing GSM network wireless access part of the Base Transceiver Station (BTS) and base station controller in GSM (BSC), and based on circuit switching and packet switching applications and interfaces, and not much impact. Therefore, network operators can maximize the use of existing wireless network equipment, only a small amount of the investment can be deployed EDGE, and through the mobile switching center (MSC) and Serving GPRS Support Node (SGSN) can also be used to retain the existing network interface. In fact, EDGE GSM applications to improve these existing performance and efficiency and for the future of broadband services possible. EDGE GPRS technology to effectively improve the efficiency of channel coding and high-speed mobile data standard, it's up to the maximum rate of 384kbit / s, to some extent, saving network investment, can fully meet future bandwidth requirements of wireless multimedia applications. In the long run, it will gradually replace the GPRS as the third generation mobile communication systems with the closest a technology.Technology to locateGSM and TDMA/136 is now the world's second-generation common cellular standards. There are currently more than 100 countries, 100 million people use GSM, there are nearly 100 countries, about 95 million users use TDMA/136 system family (including ELA-553 and IS-54) service. As between the existing second-generation mobile communication systems and third-generation mobile communication systems as a transitional data communications technology, EDGE (EnhancedDatarate for GSM Evolution) technology to dramatically improve the existing GSM network data service rate. But to give full play to advantages of speed of EDGE, operators must be on the existing GSM system architecture and all the equipment to be modified.EDGE technology is different from the GSM has the advantage of: (1). 8PSK modulation (2). Enhanced AMR encoding (3). MCS1 ~ 9 nine kinds of channel modulation coding (4). Link Adaptation (LA ) (5) incremental redundancy transmission (IR) (6). RLC window size is adjusted automatically.