1. GPRS Part II Wireless and Mobile Network Architecture 2003. 6. 10.
Nam Hyoung-Joo
Communication Protocol Engineering Lab.

2. Contents GPRS Attach Procedure GPRS Detach Procedure
PDP Context Procedure
RA/LA Update Procedure
GPRS Billing
Evolving from GSM to GPRS

3. GPRS Procedures : Attach
Attach : register with a SGSN before using services

4. GPRS Procedures : Detach
Detach : disconnect the GPRS network

5. PDP Context Procedures : Activation

6. PDP Context Procedures : Update

7. PDP Context Procedures : Deactivation

8. RA/LA Update (1/2)

9. RA/LA Update (2/2)

10. GPRS Billing (1/2)
MSC collect the billing records in GSM , but SGSN and GGSN in GPRS
SGSN : Charging information for an MS
Location information
The amount of data transmitted
The amount of time an MS occupies a PDP address
The amount of GPRS-related network resources and the GPRS network activity
GGSN
The addresses of the destination and the source defined
The amount of data delivered between the MS and the external data network
The period that the MS has used the PDP addresses

11. GPRS Billing (2/2) The data volume counted
SNDCP level in SGSN
GTP level in GGSN
CDR(Call Detail Record) types
S-CDR is generated in the SGSN for the radio usage
G-CDR is generated by the GGSN for the external data network usage
M-CDR is generated by the GGSN for mobility management activity
CCF (Charging Gateway Function)
Support charging information collection, immediate storage, and CDR transfer
CCF is either implemented in a separate network node or is distributed among the GSNs

12. Evolving from GSM to GPRS
ELEMENT
SOFTWARE
HARDWARE MS
Upgrade required
BTS
No change
BSC
PCU interface
TRAU
MSC/VLR
HLR
SGSN
New
GGSN

13. Two Phases in GPRS (1/2) Phase 1 : implements basic GPRS features
Standard packet services delivery ; that is , point-to-point packet bearer service
Support for CS-1 and CS-2 channel coding schemes
GPRS internal network interfaces such as Gn, Gb, Gp, and Gs
Flexible radio resource allocation
Support for Classes B and C MSs
GPRS charging
GSM-based services, such as SMS over GPRS
IP and X.25 interfaces to packet data network
Static and dynamic IP address allocation
Anonymous access
Security ; authentication and ciphering

14. Two Phases in GPRS (2/2) Phase 2 Enhanced QoS support in GPRS
Unstructured octet stream GPRS PDP type
Access to ISPs and intranets
GPRS prepaid
GPRS advice of charge
Group call
Point to multipoint services