What is GSM Interface ?

 GSM Interfaces:

GSM Interfaces are designed to get the interface connectivity from one node to another. Through GSM Interface protocol flow takes place.

Um Interface:

The air interface is used for exchanges between a MS and a BSS. LAPDm, a modified version of the ISDN LAPD, is used for signaling.

Abis Interface:

This is a BSS internal interface that links the BSC and a BTS; it has not been standardized. The Abis interface allows control of radio equipment and radio frequency allocation in the BTS.

A interface:

It is the interface between the BSS and the MSC. A inetrface manages the allocation of suitable radio resources to the MSs and mobility management. It uses the BSSAP protocols (BSSMAP and DTAP).

B interface:

The B interface handles signaling between the MSC and the VLR. It uses the MAP/B protocol. Most MSCs are associated with a VLR, making the B interface “internal.” Whenever the MSC needs to access data regarding an MS that is located in its area, it interrogates the VLR using the MAP/B protocol over the B interface.

C interface:

It is the interface is between the HLR and a GMSC or a SMSC. Each call that originates outside of GSM (such as an MS terminating call from the PSTN) must go through a gateway to obtain the routing information that is required to complete the call, and the MAP/C protocol over the C interface is used for this purpose. Also, the MSC can optionally forward billing information to the HLR after call clearing.

D interface:

It is the interface is between the HLR and VLR, and uses the MAP/D protocol to exchange data related to the location of the MS and subsets of subscriber data.

E interface:

It is the interface connects MSCs. The E interface exchanges data that is related to handover between the anchor and relay MSCs using the MAP/E protocol. The E interface can also be used to connect the GMSC to an SMSC.

F interface:

It is the connects the MSC to the EIR and uses the MAP/F protocol to verify the status of the IMEI that the MSC has retrieved from the MS.

G interface:

It is the inter face that connects two VLRs of different MSCs and uses the MAP/G protocol to transfer subscriber information—for example, during a location update procedure.

H interface:

The H interface is located between the MSC and the SMSG and uses the MAP/H protocol to support the transfer of short messages. Again, GSM as well as ANSI-41 is unknown, but H in ANSI-41 is used for HLR–AC interface.

Gb interface: 

This Gb interface is located between BSC and SGSN. It ensures the transmission of GPRS Mobility Management (GMM) signalling and NM (Network Management) signalling. The peer-to-peer communication across the Gb interface between the two remote BSSGP entities in the BSS and the SGSN is performed over virtual connections.

Gn/Gp interface:

Interface between the GGSN and the SGSN. The Gn interface is between two GSNs within the same public land mobile network (PLMN) in a GPRS/UMTS network. The Gp interface is between two GSNs in different PLMNs. GTP is a protocol defined on the Gn/Gp interface.

Gs interface:

It is the between SGSN and MSC/VLR is used to perform paging request of circuit switched GSM call for combined attachment procedure.

2 thoughts on “What is GSM Interface ?

Leave a Reply

Your email address will not be published. Required fields are marked *