Wireless handover and roaming on PDF

Here are some links to pdf files describing wireless and mobile handover/roaming processes. These might be a bit too technical for a person with no knowledge about wireless networks, but still, take a look, maybe you find something helpful.

• Cellular Communications - This tutorial discusses the basics of radio telephony systems, including both analogue and digital systems.
  
• Tutorial on Intelligent Networks - This
  paper presents some history of telecommunications technology, an overview of IN and its services and some
  additional discussion on the future broadband IN.
  
• Technical Issues on Roaming - Transparency, Technical Aspects and Data
  Overview related to the Proposed Regulation on
  Roaming (EU Regulations)