GPRS INTERFACES

5,663 views

Published on

GPRS INTERFACES

Published in: Engineering, Technology, Business
0 Comments
5 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
5,663
On SlideShare
0
From Embeds
0
Number of Embeds
19
Actions
Shares
0
Downloads
255
Comments
0
Likes
5
Embeds 0
No embeds

No notes for slide

GPRS INTERFACES

  1. 1. GPRS INTERFACES Presented By- Ritayan Bandyopadhyay. (ECE-3B- 85)
  2. 2. General Packet Radio Service (GPRS) What is GPRS?  Bearer service for GSM.  Packet-switched.  Can inter-operate with other packet-switched networks. (e.g. IP, X.25)  Higher data-rates and lower connection times than conventional GSM.
  3. 3. GPRS INTERFACE  Within the GPRS core network standards there are a number of interfaces and reference points (logical points of connection which probably share a common physical connection with other reference points). Connections from the GPRS system to the NSS part of the GSM network are implemented through the SS7 network. The GPRS element interfacing with the NSS is SGSN. The important interfaces to the NSS are the SGSN- HLR (Gr), SGSN-EIR (Gf) and SGSN-MSC/VLR (Gs). The other interfaces are implemented through the intra-PLMN backbone network (Gn), the inter-PLMN backbone network (Gp), or the external networks (Gi).The next slide will show the logical architecture with the interfaces and reference points of the combined GSM/GPRS network.
  4. 4. The interfaces used by the GPRS system  Um between an MS and the GPRS fixed network part. The Um is the access interface the MS uses to access the GPRS network. The radio interface to the BTS is the same interface used by the existing GSM network with some GPRS specific changes.  Gb between a SGSN and a BSS. The Gb interface carries the GPRS traffic and signalling between the GSM radio network (BSS) and the GPRS network. Frame Relay based network services is used for this interface.
  5. 5.  Gn between two GSNs within the same PLMN. The Gn provides a data and signalling interface in the Intra- PLMN backbone. The GPRS Tunnelling Protocol (GTP) is used in the Gn (and in the Gp) interface over the IP based backbone network.  Gp between two GSNs in various PLMNs. The Gp interface provides the same functionality as the Gn interface, but it also provides, together with the BG and the Firewall, all the functions needed for inter-PLMN networking, that is, security, routing, etc. The interfaces used by the GPRS system
  6. 6.  Gr between an SGSN and the HLR. The Gr gives the SGSN access to subscriber information in the HLR. The HLR can be located in a different PLMN than the SGSN (MAP).  Ga between the GSNs and the CG inside the same PLMN. The Ga provides a data and signalling interface. This interface is used for sending the charging data records generated by GSNs to the CG. The protocol used is GTP', an enhanced version of GTP. The interfaces used by the GPRS system
  7. 7.  Gs between a SGSN and a MSC. The SGSN can send location data to the MSC or receive paging requests from the MSC via this optional interface. The Gs interface will greatly improve the effectiveness of the radio and network resources in the combined GSM/GPRS network. This interface uses BSSAP+ protocol.  Gd between the SMS-GMSC and an SGSN, and between SMS-IWMSC and an SGSN. The Gd interface is available for more efficient use of the SMS services (MAP). The interfaces used by the GPRS system
  8. 8.  Gf between an SGSN and the EIR. The Gf gives the SGSN access to GPRS user equipment information. The EIR maintains three different lists of mobile equipment: black list for stolen mobiles, grey list for mobiles under observation and white list for other mobiles (MAP).  Gc between the GGSN and the HLR. The GGSN may request the location of an MS via this optional interface. The interface can be used if the GGSN needs to forward packets to an MS that is not active. The interfaces used by the GPRS system
  9. 9.  Gs Interface between the SGSN and the MSC (VLR). Uses the BSSAP+ protocol. This interface allows paging and station availability when it performs data transfer. When the station is attached to the GPRS network, the SGSN keeps track of which routing area (RA) the station is attached to. An RA is a part of a larger location area (LA). When a station is paged this information is used to conserve network resources. When the station performs a PDP context, the SGSN has the exact BTS the station is using. The interfaces used by the GPRS system
  10. 10.  Ge The interface between the SGSN and the service control point (SCP); uses the CAP protocol.  Gi IP based interface between the GGSN and a public data network (PDN) either directly to the Internet or through a WAP gateway.  Gmb The interface between the GGSN and the Broadcast-Multicast Service Center (BM-SC), used for controlling MBMS bearers. The interfaces used by the GPRS system
  11. 11.  Lg The interface between the SGSN and the Gateway Mobile Location Center (GMLC), used for location based services.  S6d The interface between SGSN and Home Subscriber Server (HSS).It is a diameter based interface which is used for transferring subscription and authentication data of the user to HSS for authenticating and authorizing user access.  Iu Interface between the Radio Network Controller and the SGSN. The interface exchanges signaling and payload. The interfaces used by the GPRS system
  12. 12.  Gx The on-line policy interface between the GGSN and the charging rules function (CRF). It is used for provisioning service data flow based on charging rules. Uses the diameter protocol.  Gy The on-line charging interface between the GGSN and the online charging system (OCS). Uses the diameter protocol (DCCA application).  Gz The off-line (CDR-based) charging interface between the GSN and the CG. Uses GTP'. The interfaces used by the GPRS system

×