In my opinion, CRNs have disadvantages concern with these topics :
- Sensing information becomes outdated fast due to issues like channel failure, receiver uncertainty for future decision making and so on.
- Requires prior information of the primary user in operations which are required matched filtering feature, which are considered more difficult to get them especially in tactical environments.
- Interference of channel is highly, because the nature of wireless medium especially for information generated from resources have high sensitivity.
So, please give my your point of view about the question and my opinion ?
Regards....
It is better to search for your answers from a particular application point of view. Now IEEE standards (802.11af and 802.22 WRAN) are in deployment phase, search for their particular application scenario and your may have a better understanding of what are the practical limitations of CR networks. Interference mitigation/avoidance between PUs-SUs and SUs-SUs are clearly the most critical of the issues. Obviously the three topics your wrote are in right direction. Channel availability and allocation to SUs for a particular band and application, wide-band sensing and regulatory constraints are also some challenges to tackle.
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