How to use local area network to surf the Internet wirelessly? 0? three

And a wireless wide area network. At present, China can access the Internet wirelessly through GPRS, CDMA 1X(2.5G), TD-SCDMA, WCDMA and CDMA2000(3G) networks. The principle of WLAN is to use a wireless router or wireless AP that can access the Internet, insert a WLAN card in the notebook (at present, Centrino notebooks have WLAN cards), and then access the Internet through the router /AP. This kind of wireless Internet access is characterized by small coverage, which can only be used in some public places, or the wireless network of enterprises and schools can be used. Of course, you can also set up your own wireless network by setting up a wireless router at home, so you can use it at home. If someone around you happens to have a wireless network, you can also "surf the Internet". This network speed depends on two parts, one is the internet speed of wired network connected by wireless router /AP (if it is ADSL, it is 5 12K, 1M or 2M, etc. ; Not necessarily if it is a company network, 10M, 100M are all possible); But when it comes to notebooks, the network speed depends on the speed of the wireless network card. At present, we commonly use three kinds, 802. 1 1b (Wi-Fi), 802. 1 1g and Super G, with speeds ranging from 2M and 54M to 108M respectively. Therefore, in general, it is possible that the Internet speed of this connection mode ranges from 5 12K to 108M. This environment is suitable for families, offices, etc. The premise is that there must be a wired network with internet access, and the speed is relatively fast and the investment is not high. Generally, it is enough to buy a wireless router /AP and a wireless network card for a notebook, and the investment is small, and there is no later internet access fee (excluding ADSL fees at home). But the problem is that it must be used around the wireless router /AP around 100 meters-Starbucks and a few five-star hotels also provide this service now. At present, WLAN signal coverage is not wide enough, which limits everyone's freedom to surf the Internet wirelessly through WLAN, and its "mobility" is also poor. Therefore, using mobile communication, that is, wireless wide area network, has become the first choice for many people to surf the Internet wirelessly. Their advantage is that they can surf the Internet anytime and anywhere. At present, GPRS, CDMA 1X(2.5G), TD-SCDMA, WCDMA and CDMA2000(3G) networks can be used for wireless Internet access in China. With the help of mobile phone network transmission, any place with mobile phone signal coverage can surf the Internet. The speed of CDMA is about 153Kbps, which is faster than GPRS. This kind of Internet access requires the purchase of a separate GPRS or CDMA wireless network card, which can be used in conjunction with the SIM card of the Internet tariff package, and can also be connected to a mobile phone to access the Internet. You need to pay the internet access fee to the mobile phone operator, which is generally charged according to the traffic, and the speed is relatively slow. At present, there are three network standards in China: TD-SCDMA of China Mobile, CDMA2000 of China Telecom and WCDMA of China Unicom. Common wireless network cards include CDMA2000 wireless network cards and TD and WCDMA wireless network cards. Due to the improvement of technology, the speed of 3G wireless Internet access has made a qualitative leap. For example, China Unicom WCDMA, the theoretical peak of network download speed 14.4Mbps, wireless Internet access bid farewell to the snail era. Attachment: Comparison of 3G business advantages of China Mobile, China Telecom and China Unicom; Comparison of speed, service and charges of 3G network cards among China Mobile, China Telecom and China Unicom: 2 3G 3G China Mobile TD-SCDMA: China's own 3G standard, which is only used in China at present. If you go abroad by plane, you can only switch to 2G GSM network to make calls. This means that during roaming, you will not be able to enjoy many special 3G services. China Telecom CDMA2000: At present, more than 60 countries and regions around the world are using this technology. But overall, the scale of foreign CDMA2000 operators is not large, and the network coverage is limited. WCDMA of China Unicom: WCDMA technology adopted by China Unicom is the most mature 3G technology in business at present. Among the 400 million 3G users in the world, over 70% are WCDMA users. More than 200 countries in the world use WCDMA 3G technology. 3G China Mobile TD-SCDMA: the theoretical peak of network download speed is 2.8Mbps; China Telecom CDMA2000: the theoretical peak of network download speed is 3. 1Mbps. WCDMA of China Unicom: The theoretical peak of network download speed is 14.4Mbps. The higher the network download speed, the better the user experience such as call quality, fluency and video communication clarity. China Mobile TD-SCDMA: During roaming abroad, users can't enjoy 3G services temporarily. China Telecom CDMA2000: It can provide 3G services, but it is affected by the global network coverage and the opening of 3G services. China Unicom WCDMA: 3G international roaming service has been launched with more than 200 countries, which can basically realize "global" roaming. China Mobile TD-SCDMA: You need to change planes for roaming, and you can only use 2G services. China Telecom CDMA2000: Because most countries in Europe use WCDMA technology, 3G users of China Telecom will probably change their WCDMA phones or use your 2G GSM phones as backup when roaming in Europe, but they will not be able to enjoy 3G services. China Unicom WCDMA: In the 2g era, due to the different network standards in Japan, South Korea, the United States, Canada and other regions, it is necessary to change the mobile phone when roaming in these countries, which has caused a lot of inconvenience to users. The 3G users of China Unicom can enjoy 3G services "globally" without changing their phones when roaming internationally. From the four perspectives of roaming range, network speed, business service and user experience, China Unicom WCDMA has obviously surpassed CDMA2000 and TD-SCDMA in customer experience, thanks to its wide global coverage, ultra-high network speed, rich business applications and the advantage of "going abroad without changing mobile phones". 3G 3G network card is a widely used Internet medium in wireless wide area communication network. At present, there are three network standards in China: mobile TD-SCDMA, telecom CDMA 2000 EVDO and Unicom WCDMA, so the common wireless network cards are EVDO wireless network cards and TD and WCDMA wireless network cards. 3G 3G network card is a widely used Internet medium in wireless wide area communication network. At present, there are three network standards in China: mobile td-scdma, telecom CDMA EVDO and Unicom WCDMA, so the common wireless network cards are EVDO wireless network cards and td and WCDMA wireless network cards. China Mobile started the trial commercialization of 3G services on April 1 2008, and China Telecom's 3G services also entered the commercial stage on April 3, 2009, while China Unicom will not be able to launch 3G services until May 17, 2009. From the initial stage, the mobile advantage is the biggest, the telecom advantage is average, and the Unicom advantage is the smallest. From the actual situation, China Mobile is suspected of taking the lead in the starting stage, because from a fair point of view, the real starting line should be counted from the time of "completing 3G signal coverage in all provincial capital cities in China". In this case, China Telecom completed it in April with the fastest speed; China Unicom completed in May, with an intermediate speed of 3; China Mobile TD Phase II will be completed by the end of June, which is the slowest. From this, we can easily see that the leader of the three types of network cards in the initial stage is actually the CDMA-EVDO network card of China Telecom. 3G China Mobile plans to invest 58.8 billion yuan to build about 60,000 TD base stations in 2009. By the end of June, the second phase of TD construction will be completed, covering all provincial capitals and fully supporting HSDPA functions. By the end of the year, 3G services will be provided in 238 prefecture-level cities, accounting for more than 70% of the total number of prefecture-level cities in China, and all cities in the eastern region will be covered. According to the plan of China Mobile, it will take 20 1 1 year for users to roam and use China Mobile's TD-SCDMA 3G service nationwide to reach the current level of GSM network. China Unicom plans to invest about 30 billion yuan in 2009. In the first half of this year, it will provide 3G trial commercial services in 55 provincial capitals and relatively developed large and medium-sized cities, and expand the service scope to 282 cities by the end of this year. According to the plan of China Unicom, 3G network coverage will be basically completed around 20 10. China Telecom is special. As the network operated by China Telecom can smoothly transition from CDMA 1X to CDMA2000 EV-DO, there is no need to build a large-scale network, only the network of network C needs to be upgraded and optimized, and 3G services have been provided in 100 large and medium-sized cities at the end of March. According to the plan of China Telecom, the network upgrade will be completed in 2009, making it the first of the three major operators to build a 3G network. Judging from the pace of network construction, telecom has the greatest advantage, China Unicom is slightly behind, and mobile needs to step up construction, so the CDMA-EVDO network card of telecom wins again. 3G For 3G network cards, speed is the key factor to win, and the speed will directly affect users' choice. Let's look at the speed of three kinds of network cards. The maximum theoretical speed of mobile TD-SCDMA network card is 384Kbps, which is the same as the speed of EDGE wireless network card in the 2.5G era. As a 3G network card, users will definitely not accept this speed. Fortunately, China Mobile also saw this deficiency. In the second phase of TD-SCDMA construction, HSDPA technology was introduced to raise the theoretical maximum rate to 2.2Mbps, which can be said to be a qualitative improvement. Unicom's WCDMA network card has the highest theoretical speed, 14.4Mbps, which is the fastest among the three types of network cards. The WCDMA network card has such a high speed, thanks to the introduction of HSDPA technology. From the experience of foreign countries, the speed of WCDMA network card can generally reach 3.6Mbps, which has exceeded the downlink rate of 2M ADSL in China. The maximum theoretical speed of CDMA-EVDO network card of telecom is 3. 1Mbps. At present, the version of EVDO network card is Rev A. In order to catch up with the speed of Unicom 14.4Mbps, Telecom has begun to deploy a faster version B (Rev B) in some large and medium-sized cities. By then, the maximum theoretical speed can reach 9.3Mbps, further narrowing the gap with China Unicom. From the theoretical data, China Unicom's WCDMA network card has obvious speed advantage, followed by telecom's CDMA-EVDO network card, and the slowest is mobile TD-HSDPA network card. So what is the effect in practical application? According to the test, the actual average downlink rate of the mobile TD network card is 60-70KB/S, and the actual average uplink rate is 30-40kB/s; Unicom's WCDMA network card, the actual average downlink rate 170- 180KB/S, the actual average uplink rate130-150kb/s; The actual average downlink rate of the EVDO network card of Telecom is110/40 KB/s, and the actual average uplink rate is 90-110 KB/s. As expected, China Unicom's WCDMA network card is the fastest, but there is no theoretical speed gap between the leading EVDO network cards. 3G has about 42 million subscribers in China Telecom, 65.438+200 million in China Unicom and nearly 400 million in China Mobile. It can be seen that moving a huge user base will bring great support to mobile. However, the above data are all users, including mobile phones. If only the network card users are analyzed, the results can be very different. We should know that China Telecom has absorbed a large number of CDMA wireless network card users while acquiring Unicom's CDMA business. From the statistical analysis of wireless network cards, CDMA network card users account for more than 90% of the total number of wireless network card users, and GPRS network card users are less than 10%. From this, we can easily see that telecommunications has a huge advantage among network card users, and many old CDMA users have indicated that they will continue to use CDMA-EVDO network cards. Therefore, attracting users is the primary task of FNL Unicom WCDMA network card. 3G From the current situation, the only variable is the tariff of China Unicom's WCDMA network card. If its tariff is reasonable and meets the needs of users, it will definitely dominate the future 3G network card market. However, can China Unicom really give users a satisfactory tariff? I don't think so. At most, 4 is equivalent to tariff. So who can finally dominate the future 3G network card market? The author is most optimistic about the CDMA-EVDO network card of Telecom, which has the fastest network coverage and is comparable to WCDMA. The most important thing is to rely on the good performance of CDMA 1X wireless network card and accumulate a large number of users. On the whole, EVDO network card has obvious advantages, but there is no obvious weakness. If telecom can reduce some tariffs, then I'm sure the CDMA-EVDO network card will be the final winner. 3G network requires consumers to know more about technology and tariffs, but it is still quite difficult or troublesome for ordinary consumers. The 3G networks of China Mobile, China Unicom and China Telecom have their own advantages and disadvantages in all aspects, which makes users confused when choosing the appropriate 3G network. Which is your best choice, TD-SCDMA, WCDMA or CDMA? Let us clear the fog for you and make a clear choice. Taking Beijing Telecom as an example, CDMA2000 mainly introduces half-year and full-year local network card packages for ordinary users, with a monthly usage fee of 160 and a network card fee of 300. Each month includes 300 hours of local online time and 5 hours of domestic roaming online time, which is equivalent to the average daily use time of 10 hours. I believe that it is enough for most users, and 5 hours of roaming can also meet the needs of ordinary users who need to go out occasionally. If you are a business user who often needs to go out, you can also choose a national roaming package according to your own needs. The excess charge is 0.05 yuan/minute, which is equivalent to 3 yuan/hour. In terms of speed, CDMA2000 currently deployed in most areas is version A, with a theoretical speed of 3. 1Mbps. After that, the current version A will be upgraded to version B, and the bandwidth will be increased to 9. 1mbps. However, there is still a gap between this and the theoretical bandwidth 14.4mbps of China Unicom WCDMA 3.5G HSDPA, but this is only theoretical data, and the actual situation needs to consider the distribution of base stations more. We tested the actual test of 180KB/s, and the data service with peak speed of 250kb/s ... CDMA 2000 adopts the method of charging by time, without limiting the traffic. Although it seems to be beneficial to users, many users will not be so restrained in bandwidth use. However, when the user terminal goes to the CDMA2000 base station, it uses the mechanism of * * * to enjoy the bandwidth, so it is very likely that users will use a lot of services that require high video bandwidth, such as online video and download, which will slow down the speed. Telecom is equivalent to China Unicom and China Mobile, with a stronger basic wired network and a larger backbone data bandwidth interface. There are some advantages in this regard, and the charging method is time-limited rather than flow-limited. In addition, in some hot spots, telecom will deploy WAPI networks with higher bandwidth in the future, and subscriber lines can be switched between EVDO and WAPI. At present, China Telecom has not officially announced the charging standards for voice services and video calls, so I won't list them here. Tip: China Telecom's CDMA2000 network has a relatively high monthly fee threshold, but for notebook users with high traffic demand, there is no doubt that CDMA2000 will have a more obvious advantage in price, and even replace the traditional wired network to some extent. Most existing CDMA cards directly support the rate of 3. 1Mbps after being inserted into EVDO terminals. If the user's CDMA card is old, you can contact Telecom to upgrade PRML to support 3G. TD-SCDMA mobile 3G data service charging model is based on traffic, which is more cost-effective for users who are mainly suitable for low-traffic applications such as instant messaging tools and mail processing. Moreover, the charging threshold of mobile 3G is lower than that of Unicom and Telecom, so users can choose packages more flexibly. According to the package tariff of 100 yuan compared with that of WCDMA, the user's monthly traffic limit is 2GB, and the average user can use 68MB of traffic every day. According to the usage habits of ordinary users, it is enough for ordinary users if they mainly browse the web, use instant messaging tools and deal with emails. But for users with high network application traffic, if they often need to download or watch online videos, TD's current charging model is obviously not suitable for them. Although this traffic charging mode may make users unhappy, it also forces users to use bandwidth resources reasonably to some extent, thus making the overall speed of network nodes higher and improving users' network experience. The actual speed test is 120KB/s, the peak speed is 160KB/s and the theoretical speed is 2.8mbps (TD-HSDPA). The data traffic tariff standard of WCDMA Unicom is basically the same as that of mobile TD-SCDMA, but the excess part is slightly lower. However, mobile has certain advantages in the choice of available mobile phones and theoretical connection speed (actual test 400KB/s, peak speed 600KB/s, theoretical speed 14.4M(WCDMA HSPA)).