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Reprinted from 76322517 at 10:58 on October 17, 2006 Reading (loading. ..) Comments (0) Category: Network technology EDGE is Enhanced Data rates for Global Evolution short,
la gear light, the enhanced data transmission technology for Global Evolution, is based on GSM / GPRS network data enhanced mobile communications technology, commonly known as the 2.75-generation technology, the main was aimed at the existing GSM operators in the world how the 800/900/1800/1900MHz GSM networks have been based on the frequency of use of existing resources in the case of (a new frequency resources must be approved by relevant state departments and required to pay a fee), can provide high-speed data services (maximum transfer speeds of up to 384kbps),
la gear originals, while increasing network capacity and network quality.
from a technical point of view, EDGE provides a new wireless modulation, providing three times the normal GSM air transmission rate. The other hand, inherited the GSM EDGE standard criteria, the carrier frequency can be based on time slots dynamically switch between GSM and EDGE (based on the type of phone), to support the traditional GSM mobile phone, thereby protecting existing network investments. EDGE networks can be gradual and flexible expansion, to maximize value for operators to provide a favorable support. It is mainly used in the GSM system, a new modulation method, that is, the most advanced multi-slot operation and 8PSK modulation. Since 8PSK existing GSM networks can be used in GMSK modulation signal space expansion from 2 to 8, so that the information contained in each symbol is 4 times the original.
this technology GSM to make full use of existing resources. In addition to using the existing GSM frequencies, but also use most of the existing GSM equipment, but only on the network software and hardware to do some minor changes to enable operators to provide mobile users such as Internet browsing, video telephony meetings and high-speed wireless multimedia services such as e-mail transmission in third generation mobile network users in advance of the commercialization of personal multimedia communication services. As EDGE is a range of existing second generation mobile networks and third generation mobile networks the transition between the technology, so some people call it EDGE can also coexist with the future WCDMA standard, which is the flexibility it has the advantage. So called EDGE to GPRS to the third generation mobile communication technology transition program
EDGE technology has been ITU (International Telecommunication Union) standards adopted as part of 3G technology. The current EDGE technology standardization by the 3GPP standards organization responsible for the organization is also responsible for the standardization of other 3G technologies, such as WCDMA. The organization responsible for coordinating the EDGE and WCDMA technology standards, to be able to make EDGE network support 3G services.
new division in the current band IMT2000, WCDMA (Wideband Code Division Multiple Access) is the most widely used 3G air interface technologies. The technology developed by the 3GPP and the ITU. WCDMA technology in the wireless communications industry has been widely recognized, and now there are a number of operators worldwide have begun commercial operation of the technology.
WCDMA technology is designed to provide a cost-effective solution that can support both the latest mobile multimedia services and traditional voice services. High efficiency is the most prominent advantages of this technology, it can be flexible in the implementation of the wireless channel can be in the same carrier, any voice and data services needed to be allocated channel capacity. WCDMA technology also supports multiple concurrent services and multimedia services, and may pass rate, latency and bit error rate index to select a different quality of service.
WCDMA network, user data will expand to about 5MHz bandwidth. Large bandwidth to support higher user data rates, and this expansion is equivalent to a frequency diversity, help to improve data transmission performance. As a result of broadband carrier technology, multiple users can share a single transceiver, so this technology is a cost-effective technology. Now the first release of 3GPP Release 5 standard used in HSDPA (High Speed Downlink Packet Access) technology can be WCDMA user peak data rate from the current 384Kbit / s to about 10Mbit / s. Enough to provide our existing wireless network speed requirements.
then, China's current situation from the point of view, whether the need to upgrade to EDGE and then to WCDMA it?
from EDGE perspective, its construction costs only include hardware and software upgrades and the cost of expansion and so on. For WCDMA, the upgrade is comprehensive, so to spend more,
la gear sale, the cycle is also longer. Time is money in today, of course, is to provide the best way to deploy EDGE and WCDMA parallel technology, you can gradually according to the needs of users to deploy WCDMA system, the current operators of GSM or GPRS to use equipment, most of the past two to three years of equipment, basic support EDGE upgrade. Therefore, to ensure the feasibility of low-cost upgrades EDGE network.
robbers now EDGES based network speed, the mobile can be extended to many of the existing GSM Internet video services are not well promoted, such as streaming media business. There is a very important point, 3G is the future direction of development. Before he arrived, if asked to carry out a number of mobile broadband data services, end users can be cultivated and developed, until the advent of 3G WCDMA really more conducive to business operators
In fact,
la gear footwear, the time period WCDMA deployed throughout the country problems, the major WCDMA equipment vendors have taken on various occasions on the chest numerous times - a year to complete WCDMA network deployment or network debugging and optimization of only one year. So, like China Mobile GSM / GPRS operators to mean in the face of such a choice, so half a year or so
not on the EDGE, GPRS will likely still a year and more speed CDMA 1X or EV-DO is a terrible alone, on the EDGE, GPRS and EDGE will work together to face within six months CDMA 1X and EV-DO launched the offensive.
appears that China Mobile is waiting and need to weigh the balance between the scale of EDGE deployment point. As GSA's view, the ideal choice is a key market in the first EDGE. Regional priorities in the deployment of large cities to coordinate the deployment of high bandwidth services, the cost of coverage and the conflict between, and the full deployment of WCDMA to secure as much of the time. Of course, WCDMA meet this requirement,
la gear shoes, but we eventually asked WCDMA network can cover all the areas already have GPRS. However, if we want to deploy the same number of WCDMA base stations, it will likely take a long time and a lot of money, so we decided to deploy EDGE to WCDMA deployment time for the same time, users can enjoy 3G services prospective experience to meet demand. It now appears that move is in accordance with this idea to deploy and implement.
GSM users worldwide has now reached 10 million, and the number is rising. The one billion GSM users in the world, China's GSM users reached 2.5 million mobile phone users are now mainly used when the voice service, but the data service revenues for operators, the importance of also increasing. Look at the people around us will know, there are mobile Internet, mobile Internet needs of people pen everywhere. WCDMA deployment to the implementation of the vacuum period, let alone to face the GPRS data transmission capacity of CDMA 1X really powerless.
Therefore, China Mobile has EDGE in some pilot cities, the effect is reflected not bad. 40 cities in the country now turn to deploy EDGE. It seems can not wait for China Mobile has a direct on the
EDGE WCDMA and CDMA 1X comparison
class EDGE
Operations Business Support Party of China Mobile
Specifications high-speed mobile data transfer 384kbps (network speed to 120k,
GPRS mobile rate up to 3 times the rate of .) Wireless interface coding
higher rate (no access interfaces There have been some upgrades)
network speed using octal phase shift keying (8PSK) modulation, in the mobile environment can be
to stabilize to 384k bps, even in stationary environments to 2Mbps,
basically able to meet the needs of a variety of wireless applications
data transmission technology can support the packet switching and circuit-switched data transmission both
; way, EDGE packet data services supported by each slot can achieve up to
11.2kbps ~ 69.2kbps rate, EDGE can be used 28.8kbps of rate of speed
support circuit-switched services; compatible with EDGE and WCDMA networks
complementary
Streaming Media ; support
business all 3 * ; support
class ; ** MA 1X
carriers support the party
technical indicators with China Unicom variable-length channel codes (Walsh), CDMA1X
peak rate for the 153.6kbit / s maximum of 800 times per second,
la gear womens shoes, fast power control, network speed up to seven modes
high data traffic in real network testing can reach more than 100K bps,
; This is not only much higher than the rate of WAP access, but also higher than ordinary dial-up modem speed.
data transfer mode CDMA 1X (first stage) using spread spectrum rate of SR1, refers
forward channel and reverse channel are used chip rate 1.2288 Mbit / s direct sequence spread spectrum single-carrier mode.
compatible with CDMA 1X network is the first phase of cdma2000
Streaming Media ; does not support 3G
all part of the business support
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Linear Mode
