QUESTION 21
If the UE s allocated uplink resources for data transmission, which of the following channel carries the uplink L1/L2 (layer 1/layer 2) control information?

A. PUSCH
B. PDSCH
C. PDCCH
D. PUCCH

Correct Answer: A
QUESTION 22
Which of the following statement about NB-IoT random access is incorrect?

A. The purpose of NB-IoT random access is the same as that of LTE.
B. The offset of the next coverage level is not lower than the sum of the PRACH duration of the previous coverage level plus the offset of the previous coverage level,
C. The NPRACH periods configured for different coverage levels must be the same.
D. NB-IoT random access can be classified into contention-based and non-contention-based random access.

Correct Answer: C
QUESTION 23
Which of the following are functions of the X2AP protocol?

A. eNodeB configuration update
B. E-RAB Management
C. Load management
D. Mobility management

Correct Answer: ACD
QUESTION 24
Which of the following statements about MIB are correct?

A. Time domain: Adjacent to the synchronization channel. The scheduling period is 40 ms.
B. Includes most important and common parameters (system bandwidth, system frame number, and PHICH configuration information).
C. Carried on BCCH-BCH PBCH
D. Frequency domain: 62 subcarriers in the center of the system bandwidth.

Correct Answer: ABC
QUESTION 25
Which of the following identifiers are used to constitute a GUTI?

A. MMEI
B. M-TMSI
C. MCC
D. S-TMSI
E. MNC

Correct Answer: ABCE
QUESTION 26
Which of the following channel is located between the RLC layer and the MAC layer?

A. Radio channel
B. Transmission channel
C. Physical channel
D. Logical channel

Correct Answer: D
QUESTION 27
What are the functions of the SGW on an LTE network?

A. Data packet routing and forwarding
B. User IP address allocation
C. Mobility anchor: During an inter-eNodeB handover, the S-GW serves as the anchor point of the user plane.
D. Downlink data buffer

Correct Answer: ACD
QUESTION 28
Which of the following event indicates that the signal strength of the serving cell is higher than a certain threshold?

A. A2 event
B. A4 event
C. A3 event
D. Al event

Correct Answer: D
QUESTION 29
From which of the following 3GPP version, the PS domaini evolved to the EPC, the control plane and user plane are separated into the MME and SGW?

A. R5
B. R8
C. R7
D. R6

Correct Answer: B
QUESTION 30
When a UE sets up an RRC connection, the UE is in the RRC_CONNECTED state. Which of the following statements about this state are correct?

A. Receive paging and SI
B. Cell reselection
C. Has RRC context information (C-RNTT)
D. Data can be transmitted

Correct Answer: CD
QUESTION 31
The dedicated bearer set up is initiated by PCRF.

A. TRUE
B. FALSE

Correct Answer: B
QUESTION 32
Which of the following bearer connection is between the UE and the PDN-GW?

A. E-RAB
B. RB
C. EPS bearer

Correct Answer: C
QUESTION 33
Which of the following is used for the application layer protocol of the S6a interface between the MME and the HSS?

A. Diameter
B. GTP
C. PMIP
D. SCTP

Correct Answer: A
QUESTION 34
Which of the following event indicates that the signal of the serving cell is lower than a threshold?

A. A1 event
B. A3 event
C. A4 event
D. A2 event

Correct Answer: D
QUESTION 35
Which of the following systems are included in an eNodeB?

A. Baseband process system
B. Antenna system
C. Power system
D. RF system
E. M Switching system

Correct Answer: ABCD
QUESTION 36
Which of the following are advantages of book RRU?

A. Easy-to-deploy
B. High power output
C. High integration
D. Macro-micro coordination

Correct Answer: ACD
QUESTION 37
Which of the following networking modes are supported by the eNodeB on the S1 interface?

A. Star topology
B. Tree networking
C. Ring topology
D. Chain topology

Correct Answer: ABCD
QUESTION 38
Which of the following FAN types can be installed on the BBU3910?

A. FANc
B. FANd
C. FANe
D. FAN

Correct Answer: BC
QUESTION 39
Which of the following are functions of the BBU3900?

A. Provides the system clock
B. Provides connection to the SGW
C. The TX channel filters downlink signals, performs digital-to-analog conversion (D/A conversion), and up-converts RF signals to the TX band.
D. Provides the maintenance channel for connecting to the OMC.

Correct Answer: ABD
QUESTION 40
The eNodeB uses the cold backup function of the main control board. That is, two UMPT/LMPT boards are configured in the BBU, and the two UMPT/LMPT boards work in active/standby mode. When the active UMPT/LMPT is faulty, the system automatically triggers an active/standby switchover.

A. TRUE
B. FALSE

Correct Answer: A