4. Mobile Communications Principles Basic Mobile Telephone Service Network

9. AMPS/DAMPS Comparison high poor Noise immunity better—easily scrambled poor Privacy authority shared cooperatively mobile slaved to base Mobile/base relationship constant frequency variable phase constant phase variable frequency Carrier type time shared bursts continuous TX/RCV type 125 to 300 conversations per cell 40 to 50 conversations per cell Subscriber capacity 3 or 6 1 Conversations per channel 30 kHz 30 kHz Channel bandwidth 824 MHz to 891 MHz 824 MHz to 891 MHz Spectrum Digital Analog

10. Evolution of Mobile Telephone Systems Cellular Subscriber Growth Worldwide

11. GSM Milestones in the GSM history

20. … continuous,,, Basic Operation, 5- Receiving a Call on a Mobile: MS receives the channel number of the paging channel to monitor Request Service Page Request Assign a Channel The MS will listen to this channel until it hears its identification number