Handoff 
References
Books
Theodore S. Rappaport, 'Wireless Communications: Principles and Practice', 2nd Edition, Prentice Hall Communications Engineering and Emerging Technologies Series.
Gordon L. Stuber, 'Principles of Mobile Communications', 2nd Edition, Gordon L. Stuber, Georgia Institute of Technology, Atlanta, Georgia, USA, Kluwer Academic Publishers.
Report ITU-R, M.2135 - 'Guidelines for evaluation of radio interface technologies for IMTadvanced'.
Video Lectures