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Network boundaries are not well defined Variable channel quality Broadcast nature Implications on density Interference from other (uncooperative) networks Makes performance/quality guarantees difficult Configuration may have to touch other entitiesЁxZEZZ,ZЇZE,ЇѓŸЈDifferences continued ..ŸЈtTopology discovery is hard Hidden terminals, mobility Self-interference Multiple host interfaces Multi-hop networksЁL,,ѓ ŸЈWhat tools do we need?Ÿ вAuto-configuration Site survey and planning should be unnecessary RF environment is changing all the time APs, clients should log information and respond to it Topology discovery Who s affecting my transmissions Root cause analysis And some advice (e.g. your microwave is on) Standardization of metrics for reporting quantities like noise, power level etc.ЁжP/P^PPP#PP,PRP/^#    ,RЊj§ѓ ŸЈWhy is this hard?Ÿ ~Many parameters to tune Frequency/channel/band, Power, Multiple radios, & . Needs cooperation between different entities Some of them (e.g. cordless phones) may not follow channel discipline Some devices such as microwave ovens are incapable of following Gaming/incentive issues Need robustness against bad decisionsЁ3-Ÿ&3-Ÿ  'ѓ  ŸЈ Research (1)Ÿ nAlgorithms for determining frequency, power, and associations  Order out of chaos Collaboration among competing entities RF-level innovations Channel bonding Spread spectrum, separate control channel Spectrum allocation and etiquettes Break up MAC into layers so that each layer can be innovated separatelyЁt>P>PP;PlP>>;lѓŸЈ Research (2)ŸЈ]Leveraging multiple radios/devices To improve connectivity (seamless roaming) MIMO Security RF-level DoS attacks are easy to launch Detection of rogue access points and networks Privacy, man-in-the-middle attacks Better models for RF propagation, usage, mobility, antennas Tools to understand RF-level phenomenon and correlate them with MAC eventsЁŒ#P0P PyP=PKP#0 y=K  Њfѕѓ  ŸЈ0What can be learned from licensed band networks?Ё11(ŸЈНCell phone companies have very good radio planning tools (?) 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Research (1) Research (2)1What can be learned from licensed band networks?  Fonts UsedDesign Template Slide Titles ћіџ@"Arialі _Р‘у@Zєt-msinght-msinghdhyes Networks .-№ :'9џџџџџџџџџџџџџџџџ§џџџўџџџўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџўџџџ;<=>?@ABCDEFGHўџџџџџџџKџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ ўџџџўџџџўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ different?Differences continued ..What tools do we need?Why is this hard? Research (1) Research (2)1What can be learned from licensed band networks?  Fonts UsedDesign Template Slide Titles ћіџ@"Arialі#_Р‘у@Z єVictor BahlVictor Bahls Networks .-№ different?Differences continued ..What tools do we need?Why is this hard? Research (1) Research (2)1What can be learned from licensed band networks?  Fonts UsedDesign Template Slide Titles і#_Р‘у>< єк0Jitu PadhyeJitu Padhye : ўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ§џџџ9ўџџџ;<=>?@ABCDEFGHўџџџўџџџKџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџRoot Entryџџџџџџџџd›OЯ†ъЊЙ)шm gзgХJРCurrent UserџџџџџџџџџџџџASummaryInformation(џџџџџџџџЬPowerPoint Document(џџџџdZDocumentSummaryInformation8џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ    ƒ №0ƒ†AПРХAџёџ3@ёї№ѓ€а3К“АіЪš;­”ЧЪš;њgў§4KdKdТ‰„О 0’ўџџ”џџџpћppћ@ <§4dddd4„Ёk 0h–(‰џ ˆ8Š0К___PPT10‹ РР?й к %№ŸѓŸЈ*Challenges in (managing) Wireless NetworksŸѓŸЈDifferent typesŸЈ}Licensed vs. unlicensed spectrum UWB GPRS 802.11 Bluetooth Asymmetric networks (data on TV channels, 3G for backchannel)ЁJ?ZZ>Z-џ3ўJѓ ŸЈ&Different scales of 802.11 deploymentsЁ''(Ÿ ТHome No centralized controller Can t ask users to do site surveys/planning Some co-operation with neighbors might be possible Enterprise Large number of access points Mobility Some central planning may be possible City-wideЁZyZZ ZMZ Zy M   ѓŸЈ$How are wireless networks different?Ё%%(Ÿ f Link is not well-defined Which network to connect to? Network boundaries are not well defined Variable channel quality Broadcast nature Implications on density Interference from other (uncooperative) networks Makes performance/quality guarantees difficult Configuration may have to touch other entitiesЁxZEZZ,ZЇZE,ЇѓŸЈDifferences continued ..ŸЈtTopology discovery is hard Hidden terminals, mobility Self-interference Multiple host interfaces Multi-hop networksЁL,,ѓ ŸЈWhat tools do we need?Ÿ вAuto-configuration Site survey and planning should be unnecessary RF environment is changing all the time APs, clients should log information and respond to it Topology discovery Who s affecting my transmissions Root cause analysis And some advice (e.g. your microwave is on) Standardization of metrics for reporting quantities like noise, power level etc.ЁжP/P^PPP#PP,PRP/^#    ,RЊj§ѓ ŸЈWhy is this hard?Ÿ 0Many parameters to tune Frequency/channel/band, Power, Multiple radios, & . Needs cooperation between different entities Some of them (e.g. cordless phones) may not follow channel discipline Some devices such as microwave ovens are incapable of following Gaming/incentive issuesЁnZ3ZZ-ZŸZ3-ŸЊѓ  ŸЈ Research (1)Ÿ nAlgorithms for determining frequency, power, and associations  Order out of chaos Collaboration among competing entities RF-level innovations Channel bonding Spread spectrum, separate control channel Spectrum allocation and etiquettes Break up MAC into layers so that each layer can be innovated separatelyЁt>P>PP;PlP>>;lѓŸЈ Research (2)ŸЈ]Leveraging multiple radios/devices To improve connectivity (seamless roaming) MIMO Security RF-level DoS attacks are easy to launch Detection of rogue access points and networks Privacy, man-in-the-middle attacks Better models for RF propagation, usage, mobility, antennas Tools to understand RF-level phenomenon and correlate them with MAC eventsЁŒ#P0P PyP=PKP#0 y=K  Њfѕѓ  ŸЈ0What can be learned from licensed band networks?Ё11(ŸЈНCell phone companies have very good radio planning tools (?) Are these tools useful for unlicensed band? Can these be automated? Co-operation in spectrum allocation improves performance Ёn=,;=,< ъю$я € 0 ”№ŒР№0№$№( № №0№r №0 S №€xlа Пџ№аџ ` №У  а  № ž№r №0 S №€`;а Пџ№а `№№У а  № ž№H №0 ƒ №0ƒ“ŽŸ‹”оНhПџ ?№ џџџ€€€Лру33™™™™Ьˆ8Š0К___PPT10‹ы.ЧgХЉsџrb<ќWѕ й><(ZХ1 ўџџџўџџџўџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџўџр…ŸђљOhЋ‘+'Гй0œ `hœА Фа є   ф,Challenges in Managing Wireless Networks Jitu Padhye Jitu Padhye39Microsoft Office PowerPoint@№r @@LыYШgХ@0ПgзgХVGtџџџџ‰g  2-  yЁќџџџ-њџџџ-$џџџџџџx x џџџџџџњ--'џџћіџ@"Arial-. -2 0Challenges in (managing)  .ћМ"SystemР:ф-№ћіџ@"Arial-. !2 <(Wireless Networks .-№