How many QoS Class Identifiers are defined in LTE technology?

The correct answer is C. 15. LTE defines 15 standardized QoS Class Identifiers (QCIs) as specified across 3GPP releases. The original 3GPP Release 8 specification established QCI values 1–9, covering services like conversational voice, video, gaming, and best-effort data, but subsequent releases added more Q

Mobile Network Fundamentals

Question

Options

How the community answered

(19 responses)

B
5% (1)
C
89% (17)
D
5% (1)

Explanation

LTE defines 15 standardized QoS Class Identifiers (QCIs) as specified across 3GPP releases. The original 3GPP Release 8 specification established QCI values 1–9, covering services like conversational voice, video, gaming, and best-effort data, but subsequent releases added more QCIs (e.g., 65, 66, 69, 70, 75, 79) to support mission-critical and specialized services, bringing the total to 15.

Option B (9) is the most common trap - it reflects only the original Release 8 QCIs and ignores later additions. Option A (6) has no basis in the standard and may confuse QCIs with other LTE bearer parameters. Option D (21) overshoots; while 3GPP has continued defining QCIs beyond Release 14, the accepted exam-relevant total for LTE is 15.

Memory tip: Think "LTE = 1 + 5 = 15 QCIs" - the original nine (Release 8) plus six added in later 3GPP releases to handle newer service types like MCPTT and V2X.

Topics

#QoS Class Identifiers (QCI)#LTE Quality of Service#Mobile Network Standards#QoS Characteristics

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