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Which RLC mode adds the least amount of delay to user traffic?

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Which RLC mode adds the least amount of delay to user traffic?

(a) Unacknowledged mode (UM)

(b) Acknowledged mode (AM)

(c) Low latency mode (LM)

(d) Transparent mode (TM)

I got this question in a national level competition.

This intriguing question comes from Long Term Evolution (LTE) in division 4G of Wireless/Mobile

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The correct choice is (d) Transparent mode (TM)

To explain: The transparent mode entity in RLC does not add any overhead to the upper layer SDUs. The entity just transmits the SDUs coming from upper layer to MAC.

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