10 chapter is the description of HSDPA principle and network optimization method; Chapter 1 1 is about the evolution of 3GPP WCDMA technology, and the technologies of HSUPA and LTE are discussed respectively. WCDMA system principle and wireless network optimization are rich in content, and many cases are taken from the actual networks of overseas operators. It is suitable for engineers and technicians engaged in WCDMA network optimization, and can also be used as a teaching reference book for senior undergraduates or graduate students majoring in communication in colleges and universities.