Question

Which among the following may be employed to reduce performance degradation on a route with interference towards primary users?

(a) Multiple spectrum brokers

(b) Spatially distributed amplifiers

(c) Multi-spectrum interfaces

(d) Spatially distributed base-stations

This question was addressed to me during an online interview.

The query is from Next Generation Wireless Network in division Next Generation Wireless Network of Cognitive Radio

Answer 1

Right answer is (c) Multi-spectrum interfaces

The best explanation: If a route between two xG users causes interference to surrounding primary users, it might affect the end-to-end latency or might cause packet loss along the route. This could be overcome by using multiple spectrum interfaces at intermediary nodes which introduces multiple hops in a route.