29-12-2012, 12:07 PM
5G Mobile Phone and Network
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INTRODUCTION
Services Offered by 2.5G Technology
GPRS extends the GSM circuit switched data capabilities and makes the following services possible :
Always on" internet access
Multimedia messaging service (MMS)
Push to talk over cellular (PoC/PTT)
Instant messaging and presence—wireless village
Internet applications for smart devices through wireless application protocol (WAP)
Point-to-point (P2P) service: inter-networking with the Internet (IP)
Addressing
A GPRS connection is established by reference to its access point name (APN). The APN defines the services such as
wireless application protocol (WAP) access,
short message service (SMS),
multimedia messaging service (MMS), and for
Internet communication services
Eg. email and World Wide Web access.
In order to set up a GPRS connection for a wireless modem, a user must specify an APN, optionally a user name and password, and very rarely an IP address, all provided by the network operator.
Coding
Schemes & Speed
The upload and download speeds that can be achieved in GPRS depend on a number of factors such as:
The number of base transceiver station (BTS) TDMA time slots assigned by the operator
The channel encoding used
The maximum capability of the mobile device expressed as a GPRS multislot class
Usability
The maximum speed of a GPRS connection offered in 2003 was similar to a modem connection in an analog wire telephone network, about 32-40 kbit/s
Latency is very high; round-trip time (RTT) is typically about 600-700 ms and often reaches 1 s.
GPRS is typically prioritized lower than speech, and thus the quality of connection varies greatly.
Devices with latency/RTT improvements are generally available.
Also, network upgrades of features are available with certain operators.
With these enhancements the active round-trip time can be reduced, resulting in significant increase in application-level throughput speeds.
GPRS Core Network
General Support Functions :
The GPRS core network provides mobility management, session management and transport for Internet Protocol packet services in GSM and WCDMA networks.
The core network also provides support for other additional functions such as billing and lawful interception.
It was also proposed, at one stage, to support packet radio services in the US D-AMPS TDMA system, however, in practice, all of these networks have been converted to GSM so this option has become irrelevant.
[attachment=45712]
INTRODUCTION
Services Offered by 2.5G Technology
GPRS extends the GSM circuit switched data capabilities and makes the following services possible :
Always on" internet access
Multimedia messaging service (MMS)
Push to talk over cellular (PoC/PTT)
Instant messaging and presence—wireless village
Internet applications for smart devices through wireless application protocol (WAP)
Point-to-point (P2P) service: inter-networking with the Internet (IP)
Addressing
A GPRS connection is established by reference to its access point name (APN). The APN defines the services such as
wireless application protocol (WAP) access,
short message service (SMS),
multimedia messaging service (MMS), and for
Internet communication services
Eg. email and World Wide Web access.
In order to set up a GPRS connection for a wireless modem, a user must specify an APN, optionally a user name and password, and very rarely an IP address, all provided by the network operator.
Coding
Schemes & Speed
The upload and download speeds that can be achieved in GPRS depend on a number of factors such as:
The number of base transceiver station (BTS) TDMA time slots assigned by the operator
The channel encoding used
The maximum capability of the mobile device expressed as a GPRS multislot class
Usability
The maximum speed of a GPRS connection offered in 2003 was similar to a modem connection in an analog wire telephone network, about 32-40 kbit/s
Latency is very high; round-trip time (RTT) is typically about 600-700 ms and often reaches 1 s.
GPRS is typically prioritized lower than speech, and thus the quality of connection varies greatly.
Devices with latency/RTT improvements are generally available.
Also, network upgrades of features are available with certain operators.
With these enhancements the active round-trip time can be reduced, resulting in significant increase in application-level throughput speeds.
GPRS Core Network
General Support Functions :
The GPRS core network provides mobility management, session management and transport for Internet Protocol packet services in GSM and WCDMA networks.
The core network also provides support for other additional functions such as billing and lawful interception.
It was also proposed, at one stage, to support packet radio services in the US D-AMPS TDMA system, however, in practice, all of these networks have been converted to GSM so this option has become irrelevant.