GPRS Network Interfaces-Um,Gb,Gn,Gp,Gi,Gr,Gc,Gf,Gd,Gs
This page covers GPRS network interfaces used in transmission plane and control plane. It includes Um,Gb,Gn,Gp,Gi,Gr,Gc,Gf,Gd and Gs interfaces.
Transmission plane provides means for exchange of the user data. The control plane is used to ensure availability of the transmission plane. The control plane also facilitates signalling between the Mobile Station(MS) and the GPRS network elements.
Transmission Plane
GPRS interface type | Between What? | Basic description | Protocol | Reference |
---|---|---|---|---|
Um | MS-BSS | Used between MS and BSS for exchange of user and signaling information | Physical RLC/MAC |
43.064/45.002 44.060 |
Um | MS-SGSN | Used between MS and SGSN for exchange of user and signaling information | LLC SNDCP |
44.064 44.065 |
Gb | SGSN-BSS | Used between SGSN and BSS for data transfer and mobility management | Physical network service BSSGP |
48.014,48.016.48.018 |
Gn | SGSN-GGSN | Used to support mobility;applicable when GGSN and SGSN are located in the same PLMN | GTP-U | 29.060 |
Gp | SGSN-GGSN | Used to support mobility;applicable when GGSN and SGSN are located in different PLMNs | GTP-U | 29.060 |
Gi | GGSN-PDN | Used to exchange data with external packet data network | IP | 29.061 |
Control Plane
GPRS interface type | Between What? | Basic description | Protocol | Reference |
---|---|---|---|---|
Um | MS-BSS | Used between MS and BSS for exchange of user and signaling information | Physical RLC/MAC |
43.064/45.002 44.060 |
Um | MS-SGSN | Used between MS and SGSN for exchange of user and signaling information | LLC GMM SM SMS |
44.064 24.008 24.008 24.011 |
Gb | SGSN-BSS | Used between SGSN and BSS for data transfer and mobility management | Physical network service BSSGP |
48.014 48.016 48.018 |
Gn | SGSN-GGSN | Used to support mobility ;applicagle when GGSN and SGSN are located in same PLMN | GTP-C | 29.060 |
Gp | SGSN-GGSN | Used to support mobility ;applicagle when GGSN and SGSN are located in different PLMNs | GTP-C | 29.060 |
Gr | SGSN-HLR | Used by the SGSN to obtain subscriber information from HLR | MAP | 29.002 |
Gc | GGSN-HLR | Used by the GGSN to retrieve information about the location and supported services for the MS,to be able to activate a packet data network address ;this is optional interface | MAP | 29.002 |
Gf | SGSN-EIR | Used by SGSN to enagbel EIR to verify the IMEI retrieved from MS; this is optional interface | MAP | 29.002 |
Gd | SGSN-SMS-IWMSC SGSN-SMS-GMSC |
Used to deliver to and receive short message form MS to SM service center | MAP | 29.002 |
Gs | SGSN-VLR | Used for coordinating the functions of SGSN and VLR when and Mobile has both GSM and GPRS services; this is optional interface | BSSAP+ | 29.016,29.018 |
RELATED LINKS
GSM Tutorial
GPRS tutorial
BER vs BLER vs DBLER
Test Mode A vs Test Mode B
GPRS RxQUAL vs BER
EGPRS Basics
EGPRS vs GPRS
What is GPRS