On Reliable Key Performance Indicators in Cognitive Radio Networks
Abd Ullah Khan, Ghulam Abbas, Ziaul Haq Abbas, Wali Ullah Khan · IEEE Networking Letters · 2021
Network serveability (NS), which considers both channel availability (CA) and service retainability (SR), is a key indicator to concisely express the performance of cognitive radio networks (CRNs). However, CA cannot guarantee connection setup if receiver’s accessibility (RxA) is neglected. Likewise, SR yields imperfect results ifRxAis ignored. As such, the two rather incomplete performance indicators misrepresent NS and lead to an overestimated satisfaction level of users. Aiming at reliable and concise analysis of CRNs’ performance, this letter introduces the concept of connection availability (CoA), which encompasses both CA andRxAfor a user. Besides, it introduces service maintainability (SM), which incorporates the impact ofRxAinto SR. Consequently, the performance is represented more concisely through network serviceability (NeS), a concept we introduce to consider both CA and SM. We show that CoA, SM, and NeS diverge with various proportions from CA, SR, and NS, respectively, under variable traffic loads and channel failure rates. This indicates the degree of performance differenceRxAintroduces, and provides network designers the basis for dependable CRN budgeting.