Question

Which among the following statements is false about spectrum aware routing?

(a) Spectrum aware routing does not require local spectrum knowledge

(b) Spectrum aware routing requires cooperation sensing

(c) Spectrum aware routing performs poorly during link failure

(d) Spectrum aware routing does not generate large overhead

This question was posed to me in an interview for internship.

This interesting question is from Next Generation Wireless Network in division Next Generation Wireless Network of Cognitive Radio

Answer 1

The correct answer is:

(a) Spectrum aware routing does not require local spectrum knowledge

Explanation:

Spectrum aware routing is a routing protocol in cognitive radio networks that takes spectrum availability and usage into account when deciding the best path for data transmission. Let's go through each statement:

• (a) Spectrum aware routing does not require local spectrum knowledge – False. Spectrum aware routing requires local spectrum knowledge to identify the available spectrum bands and choose the best routes based on spectrum availability. Without this knowledge, the routing algorithm would not be able to make informed decisions about the network's spectral resources.

• (b) Spectrum aware routing requires cooperation sensing – True. Spectrum aware routing often depends on cooperation between different network nodes to sense the available spectrum and share spectrum availability information. This cooperation helps ensure that routing decisions are based on the current state of the spectrum.

• (c) Spectrum aware routing performs poorly during link failure – True. If a link in the path fails (due to unavailability of spectrum or other reasons), spectrum aware routing protocols may struggle to quickly recover and reroute the data, especially in dynamic environments where spectrum availability changes frequently. This is a known challenge in cognitive radio networks.

• (d) Spectrum aware routing does not generate large overhead – True. When designed efficiently, spectrum aware routing protocols aim to minimize the control overhead required to sense and share spectrum information. However, there may still be some overhead involved, but with the right protocols, this overhead can be kept manageable.

Therefore, the false statement is (a), as spectrum aware routing does require local spectrum knowledge to make decisions about spectrum usage and routing paths.