GPRS (General Packet Radio Service) is a packet-based wireless communication service. It will increase the communication speed from 56k to 114Kbps (171.2k; the encoding methods adopted are mainly different: CS-1, CS-2, CS-3, CS-4, which have different transmission rates), and support computers and Mobile users' continuous connection. The high data throughput capability allows handheld and laptop computers to be used for video conferencing and multimedia pages and similar applications. GPRS is based on Global System for Mobile (GSM) and can complete existing services such as: circuit-switched connections and Short Message Service (SMS).
In theory, the cost of GPRS packet services will be less than the cost of circuit-switched services (not always occupying channels, packet transmission). Channels are shared and used only when needed. It saves a lot of resources than a dedicated connection. It will make it easier for users to provide application services. The buffer middleware that was added in order to adapt to the slow speed of the terminal equipment is no longer necessary. Once GPRS becomes a reality, mobile users can access their own virtual private network (VPN) at any time instead of dialing up every time.
GPRS will perfect Bluetooth technology as a standard to replace existing wired and wireless connection technologies. In addition, for Internet Protocol (IP), GPRS supports X.25 (a packet-based protocol that is widely used in Europe). GPRS is gradually moving towards Enhanced Data GSM Environment (EDGE) and Universal Mobile Telephone Service (UMTS). (The development trend of GPRS: GPRS, EDGE, IMI-2000).
What are the advantages of GPRS?
Compared with the original GSM dial-switched circuit-switched data transmission method, GPRS is a packet-switching technology that has the advantages of "high-speed" and "always on-line."
Real-time online
"Real-time online" means that users keep in touch with the network at any time. For example, when a user accesses the Internet, the mobile phone sends and receives data on the wireless channel. Even if there is no data transmission, the mobile phone will remain connected to the network. Not only can the user initiate data transmission, but it can also start from the network side at any time. The push service, unlike the dial-up Internet access, must be redialed to access the Internet again. (Initiated data transmission is bidirectional)
Pay-per-item For the circuit-switched GSM system, the user will occupy the wireless channel alone regardless of whether it transmits data during the entire connection period. For packet switched GPRS, users only consume resources during data transmission or reception. This means that multiple users can efficiently share the same wireless channel, thereby improving resource utilization. Corresponding to the technical characteristics of packet switching, the charging of GPRS users is mainly based on the data traffic of the communication, which is simply how much to pay.
quick login
When the GPRS mobile phone is turned on, it can log on to the GPRS network, that is, it has established a connection with the GPRS network, and the time for attachment is generally 3 to 5 seconds. Each time a GPRS data service is used, an activation process is required, typically 1 to 3 seconds, and after the activation, the Internet has been fully accessed. The fixed dial-up method requires at least 8 to 10 seconds or more for dialing, authenticating the user's name and password, and logging in to the server.
High-speed transmission
GPRS adopts packet switching technology, and the maximum data transmission rate can reach 171.2 kbit/s. At this time, it can fully support application services such as multimedia image transmission services that require high bandwidth. However, the theoretical value of 171.2 kbit/s is achieved when the CS-4 coding mode is adopted and the wireless environment is good and the channel is sufficient. The actual data transmission rate is affected by many factors such as network coding methods, terminal support, and wireless environment. At present, the access speed of GPRS users is still below 40 kbit/s. After using the data acceleration system, the rate can be increased to around 60 kbit/s to 80 kbit/s.
Free to switch
GPRS has the advantages of data transmission and voice transmission that can be switched at the same time and freely. That is, the user can receive a voice call while the mobile phone surfs the Internet. For example, the original telephone dial-up Internet access, you can not call after access, can not answer the phone, and GPRS is similar to the concept of ISDN fixed telephone, telephone Internet access correct. However, calling and Internet access at the same time requires terminal support. GPRS mobile phones are divided into three levels: A, B, and C. A type of mobile phone can still browse the Internet while it is in a voice call, send and receive E-mail, etc., that is, voice calls and data transmission can be carried out at the same time; B and C terminals cannot To make a data transmission while making a call, you must switch between data transfer and voice call. Among them, the B-type terminal can switch automatically, temporarily suspend the GPRS data transmission during the call, and continue the data transmission after the call ends; the C-type terminal needs manual switching. The most common type of mobile phone on the market today is a Class B mobile phone.
In theory, the cost of GPRS packet services will be less than the cost of circuit-switched services (not always occupying channels, packet transmission). Channels are shared and used only when needed. It saves a lot of resources than a dedicated connection. It will make it easier for users to provide application services. The buffer middleware that was added in order to adapt to the slow speed of the terminal equipment is no longer necessary. Once GPRS becomes a reality, mobile users can access their own virtual private network (VPN) at any time instead of dialing up every time.
GPRS will perfect Bluetooth technology as a standard to replace existing wired and wireless connection technologies. In addition, for Internet Protocol (IP), GPRS supports X.25 (a packet-based protocol that is widely used in Europe). GPRS is gradually moving towards Enhanced Data GSM Environment (EDGE) and Universal Mobile Telephone Service (UMTS). (The development trend of GPRS: GPRS, EDGE, IMI-2000).
What are the advantages of GPRS?
Compared with the original GSM dial-switched circuit-switched data transmission method, GPRS is a packet-switching technology that has the advantages of "high-speed" and "always on-line."
Real-time online
"Real-time online" means that users keep in touch with the network at any time. For example, when a user accesses the Internet, the mobile phone sends and receives data on the wireless channel. Even if there is no data transmission, the mobile phone will remain connected to the network. Not only can the user initiate data transmission, but it can also start from the network side at any time. The push service, unlike the dial-up Internet access, must be redialed to access the Internet again. (Initiated data transmission is bidirectional)
Pay-per-item For the circuit-switched GSM system, the user will occupy the wireless channel alone regardless of whether it transmits data during the entire connection period. For packet switched GPRS, users only consume resources during data transmission or reception. This means that multiple users can efficiently share the same wireless channel, thereby improving resource utilization. Corresponding to the technical characteristics of packet switching, the charging of GPRS users is mainly based on the data traffic of the communication, which is simply how much to pay.
quick login
When the GPRS mobile phone is turned on, it can log on to the GPRS network, that is, it has established a connection with the GPRS network, and the time for attachment is generally 3 to 5 seconds. Each time a GPRS data service is used, an activation process is required, typically 1 to 3 seconds, and after the activation, the Internet has been fully accessed. The fixed dial-up method requires at least 8 to 10 seconds or more for dialing, authenticating the user's name and password, and logging in to the server.
High-speed transmission
GPRS adopts packet switching technology, and the maximum data transmission rate can reach 171.2 kbit/s. At this time, it can fully support application services such as multimedia image transmission services that require high bandwidth. However, the theoretical value of 171.2 kbit/s is achieved when the CS-4 coding mode is adopted and the wireless environment is good and the channel is sufficient. The actual data transmission rate is affected by many factors such as network coding methods, terminal support, and wireless environment. At present, the access speed of GPRS users is still below 40 kbit/s. After using the data acceleration system, the rate can be increased to around 60 kbit/s to 80 kbit/s.
Free to switch
GPRS has the advantages of data transmission and voice transmission that can be switched at the same time and freely. That is, the user can receive a voice call while the mobile phone surfs the Internet. For example, the original telephone dial-up Internet access, you can not call after access, can not answer the phone, and GPRS is similar to the concept of ISDN fixed telephone, telephone Internet access correct. However, calling and Internet access at the same time requires terminal support. GPRS mobile phones are divided into three levels: A, B, and C. A type of mobile phone can still browse the Internet while it is in a voice call, send and receive E-mail, etc., that is, voice calls and data transmission can be carried out at the same time; B and C terminals cannot To make a data transmission while making a call, you must switch between data transfer and voice call. Among them, the B-type terminal can switch automatically, temporarily suspend the GPRS data transmission during the call, and continue the data transmission after the call ends; the C-type terminal needs manual switching. The most common type of mobile phone on the market today is a Class B mobile phone.