Its a pretty good book for those who are new to wireless and even those who'd like to learn more. It covers 1G, 2G, 2.5G and 3G wireless networks and various air interfaces used and/or are proposed for these networks. It gets over the ambiguities of various 3GPP releases and clearly describes each release (99, 2000-4, and 2000-5) and their associated network reference model. There is also plenty of good description on various 2G radio access standards (AMPS, TMDA, CDMA, GSM, WCDMA, CDMA2000) and their associated network reference models. While it doesn't have in-depth coverage of any particular wireless topic, it attempts to give a broad overview on everything wireless and provides plenty of references for readers to follow up.