I. Introduction  
A. The CRN location privacy problem  
B. Why worry about location information privacy?  
C. Location privacy protection: pros and cons  
D. State-of-the-art surveys  
E. Structure and acronyms  

II. Sources of Location Information Leakage in CRNs  
A. Location information leakage in spectrum discovery  
B. Location information leakage in spectrum analysis  
C. Location information leakage in spectrum sharing  
D. Location information leakage in spectrum mobility  
E. Summary  

III. Limitations of Generic Privacy Enhancing Technologies in CRNs  
A. Adaptation of existing privacy enhancing technologies  
B. Homomorphic encryption  
C. Oblivious transfer  
D. Private information retrieval (PIR)  
F. Differential privacy  
G. Secure multiparty computation (MPC)  
H. Summary  

IV. Location Privacy Preservation for Spectrum Opportunity Discovery Component  
A. Location privacy in cooperative spectrum sensing  
C. Summary  

V. Location Privacy Preservation in Other CRN Components  
A. Threat models  
B. Location inference attacks  
C. Location privacy preserving approaches  
D. Performance metrics and tradeoffs  
E. Summary  

VI. Open Research Problems  

VII. Conclusion