29-11-2012, 04:51 PM
3G Tutorial
[attachment=41726]
Cellular Mobile Telephony
Frequency modulation
Antenna diversity
Cellular concept
Bell Labs (1957 & 1960)
Frequency reuse
Typically every 7 cells
Handoff as caller moves
Modified CO switch
HLR, paging, handoffs
Sectors improve reuse
Every 3 cells possible
First Generation
[attachment=41726]
Cellular Mobile Telephony
Frequency modulation
Antenna diversity
Cellular concept
Bell Labs (1957 & 1960)
Frequency reuse
Typically every 7 cells
Handoff as caller moves
Modified CO switch
HLR, paging, handoffs
Sectors improve reuse
Every 3 cells possible
First Generation