LTE ERAN7.0 MIMO Feature

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| By LTEOPT

LTEOPT

Community Contributor

Quizzes Created: 5 | Total Attempts: 1,369

Questions: 10 | Attempts: 230 | Updated: Nov 5, 2024

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Questions and Answers

1.

If a number of rank is equal but the numbers of Tx ports are different. The more Tx antenna port numbers, the higher the data it can be.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement is incorrect. The number of Tx ports does not determine the data capacity of a device. The data capacity is determined by various factors, including the technology used, bandwidth, and signal strength. The number of Tx ports may affect the device's ability to handle multiple connections simultaneously, but it does not directly correlate with higher data capacity. Therefore, the answer is false.

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2.

From the picture, if a cell bandwidth is 20MHz, the picture below can show 300 Mbps data rate.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The picture cannot determine the data rate of 300 Mbps based solely on the cell bandwidth of 20MHz. The data rate is influenced by various factors such as modulation scheme, coding rate, and signal-to-noise ratio. Therefore, it is not accurate to conclude that the picture can show a data rate of 300 Mbps.

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3.

What is not the factor to select the CSI report mode?
- A.
  
  Scheduling method
- B.
  
  Numbers of Tx antenna ports
- C.
  
  UE moving speed
- D.
  
  CQI wideband/subband reports
Correct Answer
B. Numbers of Tx antenna ports

Explanation
The number of Tx antenna ports is not a factor to select the CSI report mode. The CSI report mode is typically determined by factors such as the scheduling method, UE moving speed, and CQI wideband/subband reports. The number of Tx antenna ports does not directly impact the selection of the CSI report mode.

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4.

The number of layers can be less than or equal to the number of antenna ports.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement is true because in a wireless communication system, each antenna port can be connected to one or more layers. However, it is also possible to have fewer layers than the number of antenna ports. This could be due to various reasons such as resource limitations, system design choices, or specific requirements of the communication scenario. Therefore, it is correct to say that the number of layers can be less than or equal to the number of antenna ports.

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5.

When eNB receives CSI reported by a UE, eNB must follow UE instruction.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The explanation for the given correct answer is that when eNB receives CSI (Channel State Information) reported by a UE (User Equipment), it is not mandatory for the eNB to follow the UE instruction. The eNB may use the CSI information provided by the UE as a reference, but it has the flexibility to make its own decisions based on various factors such as network conditions, resource allocation, and optimization algorithms. Therefore, the statement is false.

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6.

The amount of data distributed in each layer should be equal.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement that "the amount of data distributed in each layer should be equal" is false. In a layered architecture, the distribution of data can vary depending on the specific requirements and design of the system. Different layers may handle different amounts and types of data based on their respective responsibilities and functions. Therefore, it is not necessary for the amount of data distributed in each layer to be equal.

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7.

The higher the number of rank, the higher the throughput but the shorter the coverage.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
This statement suggests that there is a relationship between rank, throughput, and coverage. It states that as the rank increases, the throughput also increases, indicating a higher data transfer rate. However, it also mentions that the coverage becomes shorter, implying that the range or reach of the network may decrease. Therefore, the statement is true as it highlights the trade-off between higher throughput and shorter coverage when considering the rank.

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8.

The numbers of pre-coding metric codes to be used must be the same as the numbers of layers in order to be able to differentiate the data streams.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
In order to differentiate the data streams, the number of pre-coding metric codes must be the same as the number of layers. This means that each layer will have a unique pre-coding metric code assigned to it, allowing for the separation and identification of the different data streams. Therefore, the statement is true.

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9.

Closed loop is more accurate than open loop but it is only suitable with the low speed moving user in order to provide more accurate feedback, i.e. PMI.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Closed loop systems are generally more accurate than open loop systems because they use feedback to continuously adjust and correct errors. However, closed loop systems are typically slower and may not be suitable for high-speed movements. In the context of the question, closed loop systems are more accurate for low-speed moving users, which aligns with the statement that closed loop systems provide more accurate feedback in such scenarios. Therefore, the answer "True" is correct.

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10.

In order to perform MIMO, all Tx must use the same RBs (same frequency) to transmit all data streams.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
To achieve MIMO (Multiple-Input Multiple-Output) in wireless communication, all transmitters (Tx) need to use the same Resource Blocks (RBs) or frequency to transmit all data streams. This is because MIMO relies on spatial multiplexing, where multiple antennas transmit different data streams simultaneously over the same frequency. By using the same RBs, the receiver can separate and decode the different data streams accurately, resulting in improved data throughput and increased system capacity. Therefore, the statement is true.

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Current Version
Nov 05, 2024

Quiz Edited by
ProProfs Editorial Team
Oct 13, 2015

Quiz Created by
LTEOPT

Lte Eran7.0 Mimo Feature

If a number of rank is equal but the numbers of Tx ports are different. The more Tx antenna port numbers, the higher the data it can be.

From the picture, if a cell bandwidth is 20MHz, the picture below can show 300 Mbps data rate.

What is not the factor to select the CSI report mode?

The number of layers can be less than or equal to the number of antenna ports.

When eNB receives CSI reported by a UE, eNB must follow UE instruction.

The amount of data distributed in each layer should be equal.

The higher the number of rank, the higher the throughput but the shorter the coverage.

The numbers of pre-coding metric codes to be used must be the same as the numbers of layers in order to be able to differentiate the data streams.

Closed loop is more accurate than open loop but it is only suitable with the low speed moving user in order to provide more accurate feedback, i.e. PMI.

In order to perform MIMO, all Tx must use the same RBs (same frequency) to transmit all data streams.