Which statement about SGSN when it is serving a 2G network is true?

Question

Options

• AIn the 2G environment, the SGSN must connect to the BSS via a "physical" circuit.
• BLess is required of the SGSN when it is serving a 2G network.
• CThe SGSN communicates with RNC when serving a 2G network.
• DNone of the management tasks that are handled in the 3G environment by the RNC are

• A
  85% (29)
• B
  3% (1)
• C
  9% (3)
• D
  3% (1)

Explanation

Option A is correct because in a 2G GPRS network, the SGSN connects to the BSS (Base Station Subsystem) via the Gb interface, which uses Frame Relay - a physical circuit-based link. This contrasts with 3G, where the SGSN uses the IP-based Iu-PS interface to connect to the RNC.

Option B is wrong because the opposite is true - more is demanded of the SGSN in a 2G environment. In 3G, the RNC handles significant radio resource and mobility management tasks, offloading work from the SGSN; in 2G, those functions are distributed differently, increasing the SGSN's burden.

Option C is wrong because the RNC (Radio Network Controller) is a 3G element (UMTS). In a 2G network, the SGSN communicates with the BSC within the BSS - not an RNC.

Option D is wrong (and appears truncated) because many management tasks handled by the RNC in 3G do have equivalents in the 2G environment - they are simply distributed between the SGSN and the BSS components differently.

Memory tip: Think "2G = physical circuit, 3G = IP-based" - just as 2G voice uses circuit-switched connections, the 2G SGSN also relies on a physical (Frame Relay) circuit to reach the BSS.

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