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How Does a Mobile Network Work?

How Does a Mobile Network Work?

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How Does a Mobile Network Work?

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  1. How Does a Mobile Network Work?

  2. Wireless links and wireless networks - Wireless links: high bit error rate  • decreasing signal strength   disperses as it travels greater distance  attenuates as it passes through matter

  3. Wireless links and wireless networks - Wireless links: high bit error rate  •  interference from other sources   radio sources in same frequency band  E.G., 2.4 ghz wireless phone interferes with 802.11b  wireless LAN  electromagnetic noise (e.g., Microwave oven) 

  4. Wireless links:-

  5. Wireless links and wireless networks - Wireless links: high bit error rate  •  multi‐path propagation  electromagnetic waves reflect off objects taking many paths of different lengths  causing blurring of signal at the receiver 

  6. Wireless links: -

  7. Wireless network: wireless link - 

  8. Wireless network: wireless hosts -

  9. Wireless network: base station -

  10. Wireless network: infrastructure - 

  11. Scenario #1: infrastructure mode -

  12. Scenario #2: ad‐hoc networks -

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