Question

Which among the following statements is false about a radio operating with the radio environment map?

(a) Aware of application layer operations

(b) Aware of physical layer operations

(c) Awareness of performance metrics

(d) Incompatibility with underlying radio access technology

The question was posed to me in an interview for job.

My enquiry is from Next Generation Wireless Network in section Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct answer is:

(d) Incompatibility with underlying radio access technology

Explanation:

A Radio Environment Map (REM) is used in cognitive radio networks to facilitate the dynamic and intelligent management of spectrum. It provides detailed information about the radio environment, such as spectrum availability, interference levels, and other related data, which is used by cognitive radios to make better decisions regarding spectrum access.

Here’s why the other options are true:

• (a) Aware of application layer operations: Cognitive radios, with the help of REMs, can make decisions based on higher-layer application requirements such as quality of service (QoS) or specific service needs.

• (b) Aware of physical layer operations: REMs collect data related to the physical layer (such as signal strength, interference, and spectrum usage) to inform spectrum management decisions.

• (c) Awareness of performance metrics: REMs are designed to provide insight into various performance metrics, such as signal-to-noise ratio (SNR), interference levels, and spectrum occupancy.

(d) is false because the radio environment map is designed to work with the existing radio access technologies and is not inherently incompatible with them. In fact, it is developed to complement and enhance the functionality of existing radio access technologies by providing additional information for spectrum management.