LTE Protocol Test Engineer Interview Questions and Answers

RLC layer is a Radio Link Control layer in LTE protocol stack responsible for reliable data transmission.

• RLC layer is located between MAC and PDCP layers.

• It provides reliable data transmission by using ARQ (Automatic Repeat Request) mechanism.

• RLC layer supports two modes of operation: Transparent Mode and Unacknowledged Mode.

• In Transparent Mode, RLC layer does not add any header information to the data.

• In Unacknowledged Mode, RLC layer does not wait for any acknowledgement fr...read more

UE Conformance Test is a process of testing the compliance of a UE device with 3GPP standards.

• UE Conformance Test ensures that the UE device meets the minimum requirements set by 3GPP standards.

• It involves testing various aspects of the UE device such as RF performance, protocol conformance, and interoperability.

• UE Conformance Test is typically performed by accredited test labs using specialized test equipment.

• Examples of UE Conformance Tests include GCF (Global Certification...read more

Mac control elements are used for managing the access to the wireless medium in LTE.

• Mac control elements are part of the MAC layer in LTE.

• They include scheduling requests, power headroom reports, and buffer status reports.

• They are used for managing the access to the wireless medium and ensuring efficient use of resources.

• Examples of Mac control elements include contention resolution identity, logical channel identity, and transport format set.

• Mac control elements are essentia...read more

RRC (Radio Resource Control) layer is responsible for controlling the establishment, maintenance, and release of radio connections between UE and network.

• RRC layer is the highest layer in the LTE protocol stack.

• It is responsible for the establishment, maintenance, and release of radio connections between UE and network.

• It controls the configuration of radio bearers, measurement reporting, and handover procedures.

• RRC layer also manages the security functions such as authentica...read more