28-05-2014, 02:24 PM
A NEW DIMENSION TO WIRELESS COMMUNICATION
[attachment=63765]
WHAT IS GPRS ?
General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
PROTOCOLS SUPPORTED
GPRS supports the following protocols:
INTERNET PROTOCOL(IP). In practice, built-in mobile browsers generally use IPv4.
POINT TO POINT PROTOCOL(PPP). In this mode PPP is often not supported by the mobile phone operator,but if the mobile is used as a modem to the connected computer, PPP is used to tunnel IP to the phone.
When TCP/IP is used, each phone can have one or more IP addrsses allocated. GPRS will store and forward the IP packets to the phone.
SPEED OF GPRS
The upload and download speeds that can be achieved in
GPRS depend on a number of
factors such as:
The number of TDMA time slots assigned by the
operator.
The channel encoding used.
Using the CS-4 it is possible to achieve a user speed of 20.0 kbit/s per time slot.
CS-1 can achieve a user speed of only 8.0 kbit/s per time slot.
HOW GPRS WORK?
When a user turns on a GPRS device, typically it will automatically scan for a local GPRS channel.
If an appropriate channel is detected, the device will attempt to attach to the network.
The SGSN receives the attach request, fetches subscriber profile information from the subscriber’s HLR node, and authenticates the user.
Ciphering may be established at this point.
CONCLUSION
1. In theory, GPRS packet-based services cost users less than circuit-switched services since communication channels are being used on a shared-use, as-packets-are-needed basis rather than dedicated to only one user at a time.
2. It is also easier to make applications available to mobile
users because the faster data rate means that middleware
currently needed to adapt applications to the slower speed
of wireless systems are no longer be needed.
3. GPRS also complements Bluetooth, a standard for replacing
wired connections between devices with wireless radio connec-tions. In addition to the Internet Protocol (IP), GPRS supports X.25,
a packet-based protocol that is used mainly in Europe.
[attachment=63765]
WHAT IS GPRS ?
General Packet Radio Service (GPRS) is a new bearer service for GSM that greatly improves and simplifies wireless access to packet data networks
GPRS applies packet radio principal to transfer user data packets in an efficient way b/w MS & external packet data network
PROTOCOLS SUPPORTED
GPRS supports the following protocols:
INTERNET PROTOCOL(IP). In practice, built-in mobile browsers generally use IPv4.
POINT TO POINT PROTOCOL(PPP). In this mode PPP is often not supported by the mobile phone operator,but if the mobile is used as a modem to the connected computer, PPP is used to tunnel IP to the phone.
When TCP/IP is used, each phone can have one or more IP addrsses allocated. GPRS will store and forward the IP packets to the phone.
SPEED OF GPRS
The upload and download speeds that can be achieved in
GPRS depend on a number of
factors such as:
The number of TDMA time slots assigned by the
operator.
The channel encoding used.
Using the CS-4 it is possible to achieve a user speed of 20.0 kbit/s per time slot.
CS-1 can achieve a user speed of only 8.0 kbit/s per time slot.
HOW GPRS WORK?
When a user turns on a GPRS device, typically it will automatically scan for a local GPRS channel.
If an appropriate channel is detected, the device will attempt to attach to the network.
The SGSN receives the attach request, fetches subscriber profile information from the subscriber’s HLR node, and authenticates the user.
Ciphering may be established at this point.
CONCLUSION
1. In theory, GPRS packet-based services cost users less than circuit-switched services since communication channels are being used on a shared-use, as-packets-are-needed basis rather than dedicated to only one user at a time.
2. It is also easier to make applications available to mobile
users because the faster data rate means that middleware
currently needed to adapt applications to the slower speed
of wireless systems are no longer be needed.
3. GPRS also complements Bluetooth, a standard for replacing
wired connections between devices with wireless radio connec-tions. In addition to the Internet Protocol (IP), GPRS supports X.25,
a packet-based protocol that is used mainly in Europe.