What is GPRS?
A: GPRS is a general packet wireless service (General Packet Radio Service). It is a new packet data bearer service. GPRS is the most fundamental difference between the existing GSM voice system is that GSM is a circuit switched system, while GPRS is a packet switched system. Therefore, GPRS is particularly suitable for interrupt, burst or frequent, small amounts of data transmission, but also for occasional large data volume transmission. This feature is suitable for most mobile Internet applications. What is the advantage of GPRS?
A: Compared with the original GSM dial mode, GPRS is a packet switching technology, with "real-time online", "quantity billing", "quick login", "high-speed transmission", "freed out" . 1) Real-time online "real-time online", that is, the user keeps in touch with the network. For example, when the user accesses the Internet, the mobile phone sends and accepts data on the wireless channel, even if there is no data transfer, the phone has always been connected to the network, not only by launching data transmission from the user side, but also starting PUSH from the network Class services, not as far as ordinary dial-up, you have to re-dial to surf the Internet. 2) The fee user can be online, charge the fee according to the number of users to receive and send the data packet, and the user does not charge when there is no data traffic. An example is also very interesting: It's a free. 3) When the user who quickly logs in GPRS is turned on, it is always attached to the GPRS network. You only need a activation process every time you use, usually only 1-3 seconds, you can log in to the Internet, while fixed dialing methods Into the Internet requires dialing, verifying username passwords, login servers, etc., at least 8-10 seconds or even longer. 4) High-speed transmission GPRS technology, the highest theoretical value of data transmission rate can reach 171.2kb / s, but the actual speed is limited and the restrictions of mobile terminals may vary. The circuit exchange data service is 9.6K bits per second. Therefore, the relationship between the circuit exchange data service (SD) and GPRS is like 9.6k Modem and 33.6k, 56K's modem. 5) Self-switching GPRS also has the advantage of data transmission and voice transmission can be carried out simultaneously or switch. That is to say, the user can receive voice calls while surfing the Internet with a mobile phone. For example, the original telephone dial-up, you can't call again, and you can't answer the phone, and GPRS is similar to the ISDN of the fixed phone, the phone is online.
What is the concept of "forever online"?
A: "Forever Online", that is, the user keeps in touch with the network. For example, when the user accesses the Internet, the phone will send and accept data on the wireless channel. Even if there is no data transfer, the mobile phone has always been connected to the network, and does not need to be reincarily initiated when data transmission is performed, and it is not like ordinary dial-up. After the line, you have to re-dial to surf the Internet.
How much can GPRS speed? The highest rate supported by theory, how can I really realize?
A: Currently, the highest rate of GPRS network supported by CMCC is 171.2kbps, which is implemented when the coding method is CS-4, and the wireless environment is good, and the channel is sufficient. GPRS is fully capable of supporting application services such as multimedia image transmission services such as multimedia image transmission services, but actual data transfer rates are affected by network coding methods and terminal support. Now the user's access speed is approximately 30kbps-40kbps. After using the data acceleration system, the rate is approximately around 60kbps-80kbps. How long is the GPRS access time?
A: The GPRS phone can be attached to the GPRS network, which has been attached to the GPRS network, which is already established with the GPRS network. The time of attachment is generally 3-5 seconds; when using the GPRS data service, you need to activate the process, usually 1-3 seconds, activation After that, I have already accessed the Internet.
Will it affect normal calls using GPRS?
A: No. Use GPRS to access the Internet and you can receive a phone normally to make a call. Can GPRS call at the same time online?
A: Need to watch the support of your phone. GPRS mobile phone is divided into three levels of ABC: Class A mobile phone can still be interviewed, send and receive email, etc., ie voice calls and data transfer can be carried out simultaneously, namely voice calls and data transfer can be carried out at the same time; Data transmission, you need to switch between data transfer and voice phones, where the Terminal class class is automatically switched, and the GPRS data transmission is temporarily suspended, and the call ends will continue to perform data transfer. Class C terminals require manual switching. The most common market is Class B mobile phone. How is the technical advantage of GPRS than WAP?
A: The carrier of the existing WAP is a circuit exchange (CSD) mode, and GPRS is data transmission in a packet switch. The circuit switching mode data cannot be performed at the same time. In the charging mode, it is charged according to the time long, while GPRS Since it is a packet exchange, there is a large increase in the utilization rate of network resources, and GPRS can transmit the conveyance of speech and data simultaneously, which can be fully charged in accordance with the generated flow. In fact, WAP itself does not have comparability, and the content on the existing WAP can be browsed and applied as the top of GPRS, but GPRS makes the existing CSD method more easily and more convenient to charge more reasonable, for WAP service content It will also have large promotion and improvement due to the technical advancement of the network. Can GPRS replace WAP?
A: WAP is now using the GSM data service of CSD (circuit exchange data), and WAP can use GPRS to use GSM networks as a bearing mode. GPRS will not replace WAP, both of which are different categories, GSM data services in GPRS and the current CSD mode are roads. WAP is a car on the road. WAP is now driving on two cars, GPRS increases data transfer speed, is 8 lanes, you can say that GPRS enhances the WAP business, and the contents of the existing WAP can be browsed and apps via GPRS. What is the technical advantage of GPRS with GSM?
A: GPRS is a data bearer and transmission method that has been developed on the GSM basis. Compared with the original GSM, GPRS has a very significant advantage in carrying and support of data services: more efficient use of wireless networks. Channel resources, especially suitable for sudden, frequent small flow data transmission; supported data transmission rates are higher, the theoretical peak is 115kbps; the billing method is more flexible, can support billing by data traffic; GPRS can also support Voice calls while performing data transmission, etc.. GPRS and WAP, HTTP's relationship? A: We can give an example, two users call with ordinary fixed calls, mobile phones, here GPRS is equivalent to transmit voice phone line and telecommunications network, WAP and HTTP equivalent to the user's Guangdong If you speak or Mandarin, the user said, for example, "Is it eating?" Is the specific content of WAP and HTTP. Therefore, GPRS and WAP are the concept of different categories. GPRS and 2 generations, 3 generations?
A: GPRS is developed based on the second generation wireless communication system GSM, and the transmission of the GSM network is the data stream, and the third-generation wireless communication system will be performed on the basis of GPRS. Further technological advancement and development, the network fully supports high-speed, broadband multimedia data transmission. That is, GPRS is a network technology between the second generation and the third generation, which is generally called 2.5 generation. How long is the GPRS life? Is it just a transition product?
A: If the transition product can be used as a major mainstream product for several years or even longer. At present, the global development of 3 generations is more cautious. I believe that China's operators will also develop 3 generations based on the number and demand of data users. In a few years of vacuum, GPRS is undoubtedly the first choice for mobile data business development. GPRS is a group exchanged data bearer and transmission business developed on the GSM system. It is a 2.5-generation network product, but does not mean that GPRS is just a transition product. Instead, GPRS is the second generation of the third generation network. A very important, indispensable steps and milestones. Because GPRS has a leap in the data transfer to packet exchange on data transmission, there is a great promotion of the mobile Internet and data services, and the road in the current stage is not very clear. The technology development and market demand is not very mature, GPRS will become the most important load method of mobile data services in the next 4-5 years. In addition, all new technology network products and services are compatible, that is, even the 3 generation network already exists, GPRS will have a total of 3 generations due to network costs, and the market progression will have a long period of time. What is the characteristics of GPRS compare with CDMA?
A: Strictly speaking, GPRS is a mobile data transmission based on 2.5-generation technology based on the GSM network, which is implemented by group exchange. The most important advantage of GPRS is to "always online" and "billing by flow". That is, GPRS can access the Internet at any time without dialing, keep in touch with the network, and the billing is more reasonable, which is fully charged according to the actual traffic. And GPRS is developed on the basis of the original GSM on the network. Therefore, the GPRS network coverage should be more mature; the original GSM user upgrade to the GPRS user does not need to change the mobile number, direct Open the GPRS service on the GSM mobile phone number. CDMA has several IS-95A, IS-95B, and CDMA2000, IS-95B is now the narrowband CDMA, which is generally mentioned. It is a 2G-based network technology, and the data transmission used is also the same as GSM. Circuit exchange, IS_95A (CDMA 2000 1x) is a 2.5 generation technology of CDMA, and CDMA2000 is a 3-generation network technology. Most of the operators and the upcoming CDMAs in China are IS-95B, that is, only the 2nd generation of CDMA. What can GPRS bring to users? Especially with existing GSM different application services?
