Chapter 7 Computer Networking Wireless and A TOP-DOWN APPROACH SEVENTH EDITION Mobile Networks KUROSE·ROSS A note on the use of these Powerpoint slides: We're making these slides freely available to all (faculty,students,readers). They're in PowerPoint form so you see the animations;and can add,modify. and delete slides (including this one)and slide content to suit your needs. They obviously represent a lot of work on our part.In retumn for use,we only ask the following: Computer If you use these slides (e.g.,in a class)that you mention their source Networking:A Top (after all,we'd like people to use our book!) If you post any slides on a ww site,that you note that they are adapted from(or perhaps identical to)our slides,and note our copyright of this Down Approach material. 7th edition Thanks and enjoy!JFK/KWR Jim Kurose,Keith Ross ©K81862知1Rgs1 Resenved Pearson/Addison Wesley April 2016 Wireless and Mobile Networks 7-1
Computer Networking: A Top Down Approach A note on the use of these Powerpoint slides: We’re making these slides freely available to all (faculty, students, readers). They’re in PowerPoint form so you see the animations; and can add, modify, and delete slides (including this one) and slide content to suit your needs. They obviously represent a lot of work on our part. In return for use, we only ask the following: ▪ If you use these slides (e.g., in a class) that you mention their source (after all, we’d like people to use our book!) ▪ If you post any slides on a www site, that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK/KWR All material copyright 1996-2016 J.F Kurose and K.W. Ross, All Rights Reserved 7 th edition Jim Kurose, Keith Ross Pearson/Addison Wesley April 2016 Chapter 7 Wireless and Mobile Networks Wireless and Mobile Networks 7-1
Ch.6:Wireless and Mobile Networks Background: wireless(mobile)phone subscribers now exceeds wired phone subscribers(5-to-1)! wireless Internet-connected devices equals wireline Internet-connected devices laptops,Internet-enabled phones promise anytime untethered Internet access two important(but different)challenges wireless:communication over wireless link mobility:handling the mobile user who changes point of attachment to network Wireless and Mobile Networks 7-2
Ch. 6: Wireless and Mobile Networks Background: ▪ # wireless (mobile) phone subscribers now exceeds # wired phone subscribers (5-to-1)! ▪ # wireless Internet-connected devices equals # wireline Internet-connected devices • laptops, Internet-enabled phones promise anytime untethered Internet access ▪ two important (but different) challenges • wireless: communication over wireless link • mobility: handling the mobile user who changes point of attachment to network Wireless and Mobile Networks 7-2
Chapter 7 outline 7.I Introduction Mobility Wireless 7.5 Principles:addressing and routing to mobile users 7.2 Wireless links, characteristics 7.6 Mobile IP ·CDMA 7.7 Handling mobility in 6.73 IEEE 802.I I wireless cellular networks LANs(“Wi-Fi”) 7.8 Mobility and higher-layer 67.4 Cellular Internet Access protocols ·architecture standards(e.g.,3G,LTE) Wireless and Mobile Networks 7-3
Chapter 7 outline 7.1 Introduction Wireless 7.2 Wireless links, characteristics • CDMA 6.73 IEEE 802.11 wireless LANs (“Wi-Fi”) 67.4 Cellular Internet Access • architecture • standards (e.g., 3G, LTE) Mobility 7.5 Principles: addressing and routing to mobile users 7.6 Mobile IP 7.7 Handling mobility in cellular networks 7.8 Mobility and higher-layer protocols Wireless and Mobile Networks 7-3
Elements of a wireless network network infrastructure Wireless and Mobile Networks 7-4
Elements of a wireless network network infrastructure Wireless and Mobile Networks 7-4
Elements of a wireless network wireless hosts- ■laptop,smartphone ■run applications may be stationary(non- network mobile)or mobile infrastructure wireless does not always mean mobility Wireless and Mobile Networks 7-5
wireless hosts ▪ laptop, smartphone ▪ run applications ▪ may be stationary (nonmobile) or mobile • wireless does not always mean mobility Elements of a wireless network network infrastructure Wireless and Mobile Networks 7-5
Elements of a wireless network base station typically connected to wired network relay-responsible for sending packets between network wired network and infrastructure wireless host(s)in its area” ·eg,cell towers,. 802.I I access points Wireless and Mobile Networks 7-6
base station ▪ typically connected to wired network ▪ relay - responsible for sending packets between wired network and wireless host(s) in its “ area ” • e.g., cell towers, 802.11 access points Elements of a wireless network network infrastructure Wireless and Mobile Networks 7-6
Elements of a wireless network wireless link一) typically used to connect mobile(s)to base station also used as backbone link multiple access protocol network coordinates link access infrastructure ■various data rates, transmission distance Wireless and Mobile Networks 7-7
wireless link ▪ typically used to connect mobile(s) to base station ▪ also used as backbone link ▪ multiple access protocol coordinates link access ▪ various data rates, transmission distance Elements of a wireless network network infrastructure Wireless and Mobile Networks 7-7
Characteristics of selected wireless links 1300 802.11ac 450 802.11n 54 802.11a,g 802.11a,g point-to-point 5-11 802.11b 4G:LTWE WIMAX 4 3G:UMTS/WCDMA-HSPDA,CDMA2000-1xEVDO 邕 1 802.15 ejea 384 2.5G:UMTS/WCDMA,CDMA2000 .056 2G:IS-95,CDMA,GSM Indoor Outdoor Mid-range Long-range 10-30m 50-200m outdoor outdoor 200m-4Km 5Km-20 Km Wireless and Mobile Networks 7-8
Characteristics of selected wireless links Indoor 10-30m Outdoor 50-200m Mid-range outdoor 200m – 4 Km Long-range outdoor 5Km – 20 Km .056 .384 1 4 5-11 54 2G: IS-95, CDMA, GSM 2.5G: UMTS/WCDMA, CDMA2000 802.15 802.11b 802.11a,g 3G: UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO 4G: LTWE WIMAX 802.11a,g point-to-point 450 802.11n Data rate (Mbps) Wireless and Mobile Networks 7-8 1300 802.11 ac
Elements of a wireless network infrastructure mode base station connects mobiles into wired network handoff:mobile changes network base station providing infrastructure connection into wired network Wireless and Mobile Networks 7-9
infrastructure mode ▪ base station connects mobiles into wired network ▪ handoff: mobile changes base station providing connection into wired network Elements of a wireless network network infrastructure Wireless and Mobile Networks 7-9
Elements of a wireless network ad hoc mode ■no base stations nodes can only transmit to other nodes within link coverage ■nodes organize themselves into a network:route among themselves Wireless and Mobile Networks 7-10
ad hoc mode ▪ no base stations ▪ nodes can only transmit to other nodes within link coverage ▪ nodes organize themselves into a network: route among themselves Elements of a wireless network Wireless and Mobile Networks 7-10