Cellular Platform & Mobile Systems

Wireless networks in comparison to fixed networks:

• Higher loss-rates due to interference 
• Restrictive regulations of frequencies 
• Low transmission rates 
• Higher delays, higher jitter 
• Lower security, simpler active attacking 
• Always shared medium

Convergence:

• Heterogeneous access technologies:
• Multi-mode access devices 
• Dual mode phones (WiFi, 2.5/3G), UMA 
• Heterogeneous Services 
• Cellular Internet access and Internet based voice/video access 
• Challenges:
  • Time variant heterogeneous network characteristics 
  • Heterogeneous applications with different utilities 
  • System design and networking challenges

[slideshare id=2980753&doc=lecture-ict-intro-ipwireless-part01-mm-biztel-22oct09-100124070647-phpapp02]