What is the difference between GSM and GPRS?

1, GSM is the abbreviation of global system for mobile communication?

2.GPRS is the abbreviation of General Packet Radio Service.

3.GPRS is a packet data bearing and transmission service developed on the basis of GSM system.

4. The fundamental difference between GPRS and GSM is that GSM is a circuit-switched system, while GPRS is a packet-switched system.

5.GSM can only transmit data in the form of short messages, and cannot realize "real-time online" and "charging by quantity". Compared with GSM, GPRS has obvious advantages in carrying and supporting data services, and makes more effective use of wireless network channel resources, especially suitable for intermittent and aperiodic data transmission, small data transmission and infrequent transmission of large-capacity data.

6. The technical advantages of 6.GPRS are: high transmission rate; High resource utilization rate; Short access time; Always online; Support IP protocol and X.25 protocol; Reasonable charges, etc.

7、GSM？ Disadvantages:

The short messages sent by users are first sent to the server of the short message center, and then the server of the short message center queues the received short messages and sends them to the corresponding receiving user terminals in turn. If the receiving user shuts down or can't communicate normally outside the service area, the short message will be re-sent after a certain delay, which may cause the following short messages to arrive first.

In addition, the buffer opened by the SMS center server for each user is generally limited, about 15~25. When the receiving buffer is full and the receiving user can't communicate normally, they will no longer receive new short messages, that is, short messages are congested, resulting in the loss of short messages.

The retention time of short messages in the short message center server also has a certain period, generally about one day. In order to ensure the data exchange between the monitoring station and the central management machine, it is necessary to make the receiver and the network in a reliable communication state.

The short messages received by GSM module of GSM mobile phone are stored in SIM card, and ordinary SIM card can generally store 25 short messages. Therefore, it is necessary to delete the processed short messages in time to avoid the loss of short messages.

8. Advantages of 8.GPRS:

Compared with the original GSM dial-up circuit-switched data transmission mode, GPRS is a packet switching technology, which has the advantages of "high speed" and "always on"

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, a mobile phone sends and receives data on a wireless channel. Even without data transmission, the mobile phone will always be connected to the network. Users can not only initiate data transmission, but also start the push service at any time from the network side, unlike ordinary dial-up Internet access, which requires re-dialing. (Initiated data transfer is bidirectional)

Charging by volume: For GSM system with circuit-switched mode, users will occupy the wireless channel alone during the whole connection period, regardless of whether data is transmitted or not. For packet-switched GPRS, users only occupy resources when sending or receiving data. This means that multiple users can share the same wireless channel efficiently, thus improving resource utilization. Corresponding to the technical characteristics of packet switching, the charging of GPRS users is mainly based on the data flow of communication, which embodies the principle of "pay as much as you take". When there is no data traffic transmission, users don't charge even if they hang up the internet.

Fast login: GPRS mobile phone can be attached to GPRS network as soon as it is turned on, that is, it has established contact with GPRS network, and the attachment time is generally 3 ~ 5 seconds. Every time you use GPRS data service, you need an activation process, which is usually 1 ~ 3 seconds. After activation, you are fully connected to the Internet. Fixed dial-up internet access requires dialing, verifying user name and password, logging in to the server and other processes, which takes at least 8 ~ 10 seconds or even longer.

High-speed transmission: GPRS adopts packet switching technology, and the theoretical data transmission rate can reach up to 65,438+0,765,438+0.2 kbit/s, which can fully support some application services that need high bandwidth, such as multimedia image transmission services. However, the theoretical value of 17 1.2 kbit/s is realized with CS-4 coding mode, good wireless environment and sufficient channels. The actual data transmission rate is affected by many factors, such as network coding mode, terminal support, wireless environment and so on. At present, the access speed of GPRS users is still below 40kbit/s, which can be improved to about 60kbit/s ~ 80kbit/s after using the data acceleration system.

Extended data

Comparison between GPRS and GSM

GPRS is a packet-switched data bearing and transmission mode developed on the basis of GSM.

GPRS is a packet-switched data bearing and transmission mode developed on the basis of GSM. Compared with the original GSM, GPRS has obvious advantages in carrying and supporting data services: GPRS can make more effective use of wireless network channel resources, especially suitable for sudden and frequent small-flow data transmission; The data transmission rate supported by GPRS is higher, the theoretical peak value is115 kbps; GPRS charging method is more flexible and can support charging according to data flow. GPRS can also support users to make voice calls while transmitting data and so on. References:

Baidu Encyclopedia: Comparison between GPRS and GSM