The correct answer is:
(d) Radio environment map is dependent on network topology
Explanation:
A Radio Environment Map (REM) is a representation of the radio environment that is used by cognitive radios to make intelligent decisions about spectrum management and access. REMs collect and represent data about spectrum availability, signal strength, interference, and other aspects of the radio environment.
Here’s why the other options are true:
(a) Radio environment map is compatible with hybrid node technology: REMs can work with various types of nodes, including hybrid nodes (which may combine different radio technologies), to gather and disseminate environmental data across a network.
(b) Radio environment map introduces network intelligence: The purpose of REMs is to provide a framework that allows cognitive radios to make intelligent decisions based on the detailed radio environment data they collect, introducing a form of network intelligence.
(c) Radio environment map merges into the core of cognitive radio architecture: REMs are a fundamental component of the cognitive radio architecture, supporting the decision-making process by providing real-time data about the radio environment.
(d) is false because REMs are not directly dependent on the specific topology of the network. The information in a REM is more focused on the radio conditions and spectrum usage, and while network topology may influence how the REM is deployed or accessed, the REM itself is not inherently dependent on the network's physical or logical structure. It operates independently of the topology to provide broad-spectrum environmental data.