Which QCI is defined for conversational voice GBR?

Interview
1

Q. Which QCI is defined for conversational voice GBR?

a) QCI 7
b) QCI 1
c) QCI 5
d) QCI 9

Check 🔎

:arrow_right: Correct answer: Letter b.

In the EPS QoS framework, QCI 1 is reserved for conversational voice traffic with Guaranteed Bit Rate (GBR). It ensures low latency, low packet error rates, and strict priority handling, which are critical for VoLTE voice services.

QCI 1 is associated with a dedicated bearer that guarantees the required QoS parameters for real-time conversational voice.

Q. Which QCI is defined for conversational voice GBR?

a) :x: QCI 7
→ Incorrect. QCI 7 is used for video services with less stringent delay requirements.

b) :white_check_mark: QCI 1
→ Correct. Specifically defined for conversational voice GBR traffic in LTE networks.

c) :x: QCI 5
→ Incorrect. QCI 5 is typically reserved for signaling bearer traffic.

d) :x: QCI 9
→ Incorrect. QCI 9 is usually the default bearer QCI, with non-GBR characteristics for general best-effort traffic.