【 Weak current College 】 understand 3G Internet card 3 g network basic knowledge in Visual FoxPro

What is 3G Internet card

3G network card is a wireless wide area communications network using a wide range of online media. At present, China has China Mobile's td-scdma and China Telecom and China Unicom's CDMAEVDO WCDMA standard three networks, so many of the wireless Internet card including EVDO wireless Internet cards and TD, WCDMA wireless network card.

China Mobile in April, 1, began the trial commercial 3 g services, China Telecom's 3 g business also has 3 April this year to enter the commercial phase, and China Unicom will have to wait until May 17, will launch 3 g services. From the starting phase, the largest mobile advantage, General Telecom advantage, Unicom least competitive advantage.

From a practical point of view, move the starting stage of a suspicion of snatching away, because fairness perspective, the real starting point should be done from the "all provincial capitals in China 3G coverage" of the time. This is the case in April, China Telecom, the fastest to complete; China Unicom may complete, velocity centered; China Mobile TD phase to be completed by the end of June, the speed of the slowest. Thus it is not difficult to see that the three types of network card in the starting phase of leader is China Telecom's CDMA-EVDO Internet card.

3 g network construction

China Mobile is planning to invest $ 588 2009, the new TD-station-approximately 60 000 a TD, completed by the end of June, the second phase construction covering all capital cities and all support HSDPA capabilities that will end in 238 prefecture-level cities 3G services, accounting for the number of cities, of which more than 70 percent in the eastern regions and cities will implement all of the coverage. According to China Mobile's planning, users want nationwide roaming with China Mobile's business, meet current TD-SCDMA3G GSM network level, have to wait until 2011.

China Unicom 2009 plans to invest $ 30 billion or so, and the first half of this year in 55 cities and economically more developed cities provide 3G on business services, expand the scope of the service at the end to 282 cities. According to China Unicom plans, 3 g network in about 2010 complete coverage.

China Telecom are special, because China Telecom network from CDMA1X smooth transition to the new without massive CDMA2000EV-DO, network, telecommunications network only on the C implementation of network upgrades and optimization, and at the end of March in 100 cities provides 3G service. According to the plans of China Telecom, 2009 years to complete the work, becoming a network upgrade three operators in the completion of the 3 g network operators.

The pace of construction from a network perspective, the biggest telecom advantage, Unicom slightly backward, mobile you will need to intensify its construction, from Telecom CDMA-EVDO Internet card again WINS.

3G NIC speed comparison

For 3G network card, the speed is a key factor in winning, or slow will directly around the user's choice, a look at three network cards to their speed.

Move TD-SCDMA network card, the maximum theoretical speed 384Kbps, and 2.5G era EDGE of wireless network card speed is the same as 3G network card, the speed of the user must not be accepted. Also good mobile also saw this point enough, in the second phase construction TD-SCDMA introduces HSDPA skills, the maximum theoretical speed upgrade to 2.2Mbps, it can be said that there is a qualitative improvement.

Unicom WCDMA network card, the maximum theoretical speed 14.4Mbps, three types of network card in the fastest, WCDMA network card has such a high speed also benefited from the introduction of HSDPA skills. Experience from abroad, WCDMA network card speed usually ranging 3.6Mbps, exceeded domestic 2 m downlink rate ADSL.

Telecom CDMA-EVDO network card, the maximum theoretical speed of 3.1Mbps. The current version of the EVDO Internet card to RevA, in order to catch up with China Unicom 14.4Mbps speed, telecommunications has begun in some of the large and medium-sized cities deployment faster B version, (RevB) maximum theoretical speed of up to further reduce 9.3Mbps, and Unicom gap.

Data from the theoretical point of view, Unicom WCDMA network card speed of obvious advantages, followed by Telecom CDMA-EVDO network card, the slowest is moving TD-HSDPA Internet card. So the effect in actual use? according to tests, Mobile's TD network card actual average downlink rate 60-70KB/S, the actual average uplink speed 30-40KB/S; Unicom's WCDMA network card, the actual average downlink rate 170-180KB/S, the actual average uplink speed of 130-150KB/S; Telecom EVDO network card, the actual average downlink rate 150-170KB/S, the actual average uplink speed 120-130KB/S. As expected, Unicom WCDMA network card remains the fastest, but leading the magnitude of the EVDO network card does not like the gap between the theoretical speed, Mobile's TD network card is still disappointing, only half of the first two.

3G user base quantity comparison

In the user group, China Telecom users about 4200 million, China Unicom users is Telecom 3 times about 1.2 billion people, China Mobile and China Unicom users more than three times, nearly 4 million people. This shows that mobile huge user base will bring great for mobile support. However the above data is including mobile phones, all users, if only from network card user group analysis, the results can be significantly different.

Do you knowRoad, China Telecom in the acquisition of the original Unicom CDMA business while also attracting a large number of CDMA wireless Internet card user. From the wireless network card for statistical analysis, and CDMA network card user takes up a wireless network card user more than 90% of the total, less than 10% for GPRS Internet card user. Thus it is not difficult to see that the network card user group, the giant Telecom advantages, many old CDMA users to also indicated that they would continue to use CDMA-EVDO network card, so for the fn Unicom WCDMA network card, it is imperative to attract users.

The future development of the forecast 3G

Judging from the present situation, the only variable is the Unicom WCDMA network card of the tariff of doubt, if it's a reasonable fee, meet the needs of users, it will guide the future 3 g network card market. However Unicom really gives the user satisfactory tariff? net-man feel completely will not be, at best is the tariff equivalent. So who can eventually lead to the future 3 g network card market? NET Knight is the most promising Telecom CDMA-EVDO network card, it's the fastest network coverage, speed comparable with WCDMA, mainly rely on CDMA1X wireless network card's good performance has accumulated a large user base. Comprehensive, EVDO Internet card advantages, there is no obvious weakness, if Telecom then can reduce some charges, so I bet, CDMA-EVDO network card will be the final winner.