Question

Which among the following is true about centralized spectrum sharing?

(a) Centralized spectrum sharing does not rely on fixed infrastructure units

(b) Centralized spectrum sharing holds each node responsible for spectrum allocation

(c) Centralized spectrum sharing reduces the overhead of communication

(d) Centralized spectrum sharing has a controlling entity for spectrum allocation and spectrum access

This question was addressed to me at a job interview.

Question is from Next Generation Wireless Network in portion Next Generation Wireless Network of Cognitive Radio

Answer 1

Right choice is (d) Centralized spectrum sharing has a controlling entity for spectrum allocation and spectrum access

To explain I would say: Centralised spectrum sharing consists of a central entity for performing spectrum allocation and spectrum access. Each node in the network forwards information on the spectrum and the interference to the central entity. The central entity builds the spectrum allocation map using the collected information.