What is the name of the logical interface between SGSN and BSC nodes?

The correct answer is C. Gb. Gb is the correct answer because it specifically names the logical interface connecting the SGSN (Serving GPRS Support Node) to the BSC (Base Station Controller) in a 2G/GPRS network, carrying both user data and signaling traffic over a Frame Relay or IP transport. Why the…

Mobile Network Fundamentals

Question

Options

AGn
BGr
CGb
DIu-PS

How the community answered

(29 responses)

A
7% (2)
B
3% (1)
C
86% (25)
D
3% (1)

Explanation

Gb is the correct answer because it specifically names the logical interface connecting the SGSN (Serving GPRS Support Node) to the BSC (Base Station Controller) in a 2G/GPRS network, carrying both user data and signaling traffic over a Frame Relay or IP transport.

Why the distractors are wrong:

Gn connects either two SGSNs together or an SGSN to a GGSN within the same PLMN - it stays within the core network backbone.
Gr links the SGSN to the HLR (Home Location Register) for subscriber data lookups, not to radio access nodes.
Iu-PS is a 3G UMTS interface connecting the SGSN to the RNC (Radio Network Controller), not a BSC - BSCs belong to 2G/GPRS architecture, RNCs to 3G.

Memory tip: The "b" in Gb stands for the BSC side of the connection - the only letter option that phonetically hints at its radio access partner.

Topics

#GPRS architecture#SGSN-BSC interface#Gb interface#packet core network

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