This book is a kind of collection of related papers on GSM andvarious related subjects each written by different author. Thereare much better GSM books available in the market (like G Heineor S. Redl or M. Mouly or J. Eberspaecher or J. Tisal,etc.)Furthermore some wireless network architecture books (likeYi-Bing Lin) cover GSM and all GSM related subjects well enough.In stead of buying this book, one can collect similar papersjust by surfing in internet. I would spend the same amount ofmoney for buying other GSM books in stead of this one.