06-10-2012, 05:03 PM
GPRS Overview
[attachment=35574]
What is HSCSD?
HSCSD (High Speed Circuit Switched Data).
HSCSD invented the principle of timeslot bundling to achieve higher throughput rates.
The simplest high speed data upgrade for GSM.
Provides GSM users with a bandwidth up to 57.6 Kbps.
Does not require a hardware upgrade within BSS or core network (NSS), but different MS are needed.
What is GPRS?
GPRS (General Packet Radio Service) is a packet oriented data service for IP and X.25 over GSM networks.
Enables packet-switched services on the resources of the already existing GSM network infrastructure
Deploying new channel coding schemes and timeslot bundling, GPRS is capable of providing single user throughput rates of up to 160 kbit/s (in theory).
Provides an “always on” functionality, without continuous consumption of resources.
Requires a major hardware upgrade in the GSM network and it requires new mobile stations
A step toward 3G networks (2.5G).
PCU (Packet Control Unit)
Interface the new GPRS core network to the existing GSM BSS.
Converting packet data coming from the SGSN in so called PCU-frames that have the same format as TRAU-frames. These PCU-frames are transparently routed through the BSC and towards the BTS. The BTS needs to determine the respective coding scheme and other options before processing a PCU-frame.
Takes over all GPRS radio related control functions from the BSC.
[attachment=35574]
What is HSCSD?
HSCSD (High Speed Circuit Switched Data).
HSCSD invented the principle of timeslot bundling to achieve higher throughput rates.
The simplest high speed data upgrade for GSM.
Provides GSM users with a bandwidth up to 57.6 Kbps.
Does not require a hardware upgrade within BSS or core network (NSS), but different MS are needed.
What is GPRS?
GPRS (General Packet Radio Service) is a packet oriented data service for IP and X.25 over GSM networks.
Enables packet-switched services on the resources of the already existing GSM network infrastructure
Deploying new channel coding schemes and timeslot bundling, GPRS is capable of providing single user throughput rates of up to 160 kbit/s (in theory).
Provides an “always on” functionality, without continuous consumption of resources.
Requires a major hardware upgrade in the GSM network and it requires new mobile stations
A step toward 3G networks (2.5G).
PCU (Packet Control Unit)
Interface the new GPRS core network to the existing GSM BSS.
Converting packet data coming from the SGSN in so called PCU-frames that have the same format as TRAU-frames. These PCU-frames are transparently routed through the BSC and towards the BTS. The BTS needs to determine the respective coding scheme and other options before processing a PCU-frame.
Takes over all GPRS radio related control functions from the BSC.