HW 3_Ad_Zig_WLAN_S_9+ solutions

HW 3_Ad_Zig_WLAN_S_9+ solutions - Prof. Dzhanidze R. CS...

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Prof. Dzhanidze R. CS M117, HW #3 UNIVERSITY OF CALIFORNIA, LOS ANGELES CS M117 Home Work #3 (Due: 04/23/08) TA_________________ Theory Section: Ad-Hoc; Zigbee Questions 1.Wireless nets: (a) What is the main similarity between a Wireless LAN and an Ad Hoc network (b) What is the main difference? 2. Why is multihopping used in Ad-Hoc nets? 3. Explain why the Zigbee designers did not include RTS/CTS in the MAC protocol. How does a source recover from hidden terminal problems then? 4. Do you think some version of Zigbee could carry voice, say from cell phone to headset, thus competing with Bluetooth? What about video? 5. If Zigbee were used in the scenario above, would it be beacon- mode of beacon-less? Answer: to save energy, to better utilize the channel (reducing interference); to overcome obstacles Voice Yes, Video Not No RTS/CTS because of small packet size < 128 B; ACKs allow hidden terminal recovery (a) both wireless; (b) one is infrastructure based; the other is self – configured and self-deployed (no infrastructure)
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Prof. Dzhanidze R. CS M117, HW #3
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This note was uploaded on 06/14/2009 for the course CS M117 taught by Professor Dzhanidze during the Spring '09 term at UCLA.

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HW 3_Ad_Zig_WLAN_S_9+ solutions - Prof. Dzhanidze R. CS...

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