mooc5G Mobile Communication Experiments期末答案(mooc完整答案)
67 min readmooc5G Mobile Communication Experiments期末答案(mooc完整答案)
Chapter 1: Test
1、末答In 5G,案m案 the technology used to increase the number of users is
A、Massive MIMO
B、整答NOMA
C、末答Massive Carrier Aggregation （CA）
D、案m案1ms TTI
2、整答How many devices do you think 5G can support per square kilometer?末答
A、1000
B、案m案10,整答000
C、100,末答000
D、1,案m案000,000
3、When the system bandwidth is 整答80MHz, the UE channel bandwidth cannot be
A、120MHz
B、末答40MHz
C、案m案20MHz
D、整答50MHz
4、Which of the following is not typical 5G application scenario？
A、Enhance Mobile Broadband
B、Massive Machine-Type Communications
C、High security
D、Ultra-reliable and Low Latency Communications
5、Which kind of 5G application scenario does unmanned driving belong to？
A、eMBB
B、mMTC
C、uRLLC
D、None of the above
6、Which of the following frequency bands belong to 5G?
A、3300-3400MHz
B、3400-3600MHz
C、4800-5000MHz
D、1880-1900MHz
7、The driving force of 5G include
A、Large video
B、Internet of things
C、VR/AR
D、Drone
8、Which of the following frequency bands belongs to the Sub 6GHz？
A、1.8 GHz
B、3.5 GHz
C、26 GHz
D、35 GHz
9、From 1G to 5G, which of the following values becomes higher
A、Signal wavelength
B、Signal frequency
C、Antenna size
D、Number of Base stations
10、Which of the following factors can promote the mature application of 5G？
A、Standard
B、Equipment
C、RF chip
D、Test instrument
Chapter 2: Parameter configuration of mobile communication system
Chapter 2: Test
1、The Max bandwidth of 4G system is ( )
A、5MHz
B、10MHz
C、20MHz
D、40MHz
2、What are the key data in SIM card （ ）
A、ICCID
B、Ki、IMSI
C、ADF
D、PIN、PUK
3、Suppose that the total output power of the cell is 46dbm. When there are two antennas, the power of a single antenna is （ ）
A、46 dBm
B、43 dBm
C、49 dBm
D、40 dBm
4、Which of the following services requires the highest system bandwidth? （ ）
A、VR
B、Internet of vehicles
C、Machine Type Communication
D、4k video
5、In wireless environment, which of the following method can not solving the problem of intra-frequency interference?（ ）
A、Adjust antenna down tilt
B、Adjust antenna direction
C、Control the cell coverage
D、Reduce the distance between intra-frequency cells
6、The maximum rank of 4 * 2 MIMO (transmitter: 4 antennas, receiver: 2 antennas) is 4.
7、The receiver sensitivity of base station is related to the transmitting power.
8、The Reference Signal (RS) can be used for downlink channel quality detection.
9、One of the advantages of TDD over FDD is that it supports asymmetric spectrum.
10、In an FDD system, the downlink data rate is much higher than that of uplink, it is mainly due to the poor wireless environment.
Chapter 3: Network entry from UE power up
Chaper 3: Test
1、How many preamble are available in each cell？( )
A、32
B、64
C、128
D、256
2、Which of the following message contains the IP address assigned to UE by the network? ( )
A、rrcConnectionSetup
B、rrcConnectionReconfiguration
C、rrcConnectionSetupComplete
D、rrcConnectionReconfigurationComplete
3、How many types of random access are there? （ ）
A、4
B、3
C、2
D、1
4、Which of the following is the criteria for cell selection? ( )
A、Srxlev>0
B、Squal>0
C、Srxlev>0，and Squal>0
D、Srxlev>0 or Squal<0
5、Which of the following parameter need not be considered in the PRACH parameter planning ? （ ）
A、PCI
B、Preamble format
C、High speed flag
D、Cell radius
6、After the initial random access fails, UE can increase the transmission power and continue to initiate the random access process
7、When UE initiates random access, the specific reason is carried in RRC Connection Request signaling
8、Data service can be used even if there is no SIM card
9、For contention-free based random access, the preamble is assigned by the network
10、The preambles for Random Access used in each cell are the same
Chapter 4: System Information and Paging
Chapter 4: Test
1、Paging area size depends on ( )
A、LAC
B、RAC
C、TA
D、TA List
2、System message ( ) contains inter-frequency information related to cell reselection
A、SIB1
B、SIB3
C、SIB4
D、SIB5
3、Which downlink physical channel is MIB included in ? ( )
A、PDCCH
B、PBCH
C、PDSCH
D、PCH
4、The scenarios that UE needs to get system information ( )
A、Cell selection and reselection
B、Handover complete
C、Returning to the coverage area
D、Receive system information change notification
5、System information is mainly composed of ( )
A、MIB
B、SIB
C、PCI
D、IMSI
Chapter 5: Measurement and Handover
Chapter 5: Test
1、In the event trigger measurement report, event A3 is defined as ( )
A、The serving cell is better than the threshold
B、The neighbor cell is better than the serving cell and exceeds the offset value
C、Neighbor cell is better than threshold
D、This serving cell is worse than the threshold, and the neighboring cell is better than another threshold
2、In 4G, intra-frequency handover is based on ( )
A、RSRP
B、CQI
C、RSRQ
D、RSSI
3、Which ofthe following description is wrong for the purpose of downlink reference signal ( )
A、Downlink channel quality measurement
B、Downlink channel estimation
C、Cell search
D、Time and frequency synchronization
4、Which types can handover be divided into according to the trigger reasons ( )
A、Coverage based handover
B、Load based handover
C、Service based handover
D、UE speed based handover
5、What are the three stages of handover? ( )
A、Measurement report
B、Handover preparation
C、Handover execution
D、Handover complete
6、LTE intra-system handover includes ( )
A、Intra-eNodeB handover
B、X2 handover
C、S1 handover
D、Handover between SGSNs
Chapter 6: Multiple Input Multiple Output (MIMO)
Chapter 6: Test
1、The generalized definition of MIMO is ( )
A、Multiple input multiple output
B、Single input single output
C、Multiple input single output
D、Single input multiple output
2、Which of the following statement about 2 * 2 MIMO is correct? （）
A、2 transmit antennas refers to eNodeB, and 2 receive antennas also refers to eNodeB
B、2 transmit antennas refers to eNodeB, and 2 receive antennas refers to UE
C、2 transmit antennas refers to UE, and 2 receive antennas also refers to UE
D、2 transmit antennas refers to UE, and 2 receive antennas refers to eNodeB
3、In general, the spacing between the elements of smart antenna is ( )
A、1 wavelength
B、1/2 wavelength
C、1/4 wavelength
D、2 wavelength
4、Which of the following indicators can indicate the number of MIMO layers currently available for NR systems? ( )
A、SRS Power
B、RANK indicator
C、SSB Index
D、CQI
5、In 5G, which technology can be used to increase the number of access users? ( )
A、Massive MIMO
B、SOMA
C、Massive CA
D、1ms TTI
6、The main gains of MIMO technology include ( )
A、Spatial multiplexing
B、Beamforming
C、Transmit diversity
D、Power control
7、Which of the following statements about MIMO are correct? ( )
A、Spatial multiplexing can improve cell throughput and peak rate
B、Spatial multiplexing is usually used in the central area of the cell
C、Virtual MIMO can be used for uplink transmission
D、Spatial diversity can improve coverage
Chapter 7: Radio Resource Management (RRM)
Chapter 7: Test
1、What problem is ICIC technology used to solve? （ ）
A、Adjacent channel interference
B、Co-channel interference
C、Random interference
D、Inter-system interference
2、Which of the following items is the most important consideration for frequency domain resource scheduling?
A、CQI
B、UE capability
C、System bandwidth
D、Buffer size
3、Which of the following resource scheduling algorithms can achieve maximum system capacity?
A、Round Robin algorithm
B、Maximum C/I algorithm
C、Proportional Fair algorithm
D、Minimum C/I algorithm
4、Which entity performs cell selection and reselection for UE in idle state? ( )
A、Serving gateway
B、MME
C、eNodeB
D、UE
5、What criteria is used for cell selection? ( )
A、S-Criterion
B、R-Criterion
C、T-Criterion
D、Q-Criterion
6、What criteria is used for cell reselection? ( )
A、S-Criterion
B、R-Criterion
C、T-Criterion
D、Q-Criterion
7、Which of the following interference may exist in the wireless network? ( )
A、Spurious emission interference
B、Blocking interference
C、Intermodulation interference
D、Harmonic interference
8、Which of the following technologies can reduce inter cell interference? ( )
A、Combining signals from different cells to reduce the influence of adjacent cell signals
B、Randomize the interference by scrambling, interleaving and frequency hopping
C、Demodulation of multi-cell information jointly using interleaved multiple access (IDMA)
D、Interference coordination by limiting the time-frequency resources used at the cell edge
Chapter 8: Link adaption
Chapter 8: Test
1、Link adaptation technology mainly includes ( )
A、Handover control
B、Power control
C、Adaptive modulation and coding
D、Hybrid automatic request retransmission
2、The types of power control include ( )
A、Open loop power control
B、Closed loop power control
C、Inner loop power control
D、Outer loop power control
3、The purpose of power control are ( )
A、Guarantee service of quality
B、Reduce interference
C、Reduce energy consumption
D、Improve coverage and capacity
4、AMC achieves performance improvement by dynamically adjusting parameters of ( )?
A、Transmission power
B、Modulation level
C、Coding rate
D、Antenna number
5、Which of the following protocol layers is the security protection of communication system implemented? ( )
A、NAS
B、HTTP
C、PDCP
D、FTP
6、Uplink power control includes ( )
A、Power control of PUSCH
B、Power control of PUCCH
C、Power control of SRS
D、ICIC control
中国大学5G Mobile Communication Experiments
随着5G技术的发展，越来越多的研究机构和企业开始关注和投入到5G移动通信领域。中国大学也在积极开展5G移动通信实验，并取得了一些令人瞩目的成果。
实验基地
中国大学的5G移动通信实验基地设在校园内，占地面积约1000平方米。实验基地配备了5G核心网、5G边缘计算服务器、5G MIMO（多入多出）测试设备、5G仿真系统等一系列先进设备，满足了5G通信技术的各项实验需求。
实验内容
中国大学的5G移动通信实验内容包括以下几个方面：
- 5G MIMO技术研究。实验人员通过5G MIMO测试设备对信号的接收和传输进行研究，优化信号传输质量。
- 5G边缘计算应用研究。实验人员利用5G边缘计算服务器进行多种应用场景的研究，包括智能农业、智能制造等。
- 5G安全性研究。实验人员对5G通信技术的安全性进行研究，探索5G通信网络的安全防护措施。
- 5G网络切片技术研究。实验人员对5G网络切片技术进行研究，探索在5G网络中实现多种不同业务的网络切片。
实验成果
中国大学的5G移动通信实验取得了一些令人瞩目的成果：
- 成功完成了5G网络切片技术的研究，并在实验基地内实现了多种不同业务的网络切片。
- 研究了5G MIMO技术，成功优化了信号的传输质量，并实现了高速率的数据传输。
- 在5G边缘计算应用研究方面，成功实现了智能农业、智能制造等多种应用场景，并取得了良好的效果。
- 研究了5G通信技术的安全性，并提出了一系列安全防护措施，为5G通信技术的安全保障提供了有力支持。
实验意义
中国大学的5G移动通信实验具有重要的意义：
- 对5G移动通信技术的研究具有重要的推动作用，有助于促进5G技术的发展和应用。
- 为5G通信技术的商业应用提供了有力支持，有助于推动5G通信产业的发展和壮大。
- 为我国5G通信技术的发展和崛起提供了重要的支持和保障。
结语
中国大学的5G移动通信实验取得了一系列重要成果，为5G通信技术的发展和应用提供了有力支持。相信随着5G技术的不断发展和完善，中国大学的5G移动通信实验将在未来继续发挥重要作用，为我国5G通信技术的崛起贡献力量。
