Chapter 6 Computer Networking A Top-Down Approach Wireless and Mobile Networks KUROSE ROSS A note on the use of these ppt slides: Computer 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. Networking:A 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 Top Down ask the following: If you use these slides (e.g.,in a class)that you mention their source Approach (after all,we'd like people to use our book!) 6th edition 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 Jim Kurose,Keith Ross material. Addison-Wesley Thanks and enjoy!JFK/KWR March 2012 urhts Reserved Wireless,Mobile Networks 6-1
Chapter 6 Wireless and Mobile Networks Computer Networking: A Top Down Approach 6th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 A note on the use of these ppt 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 1996-2012 J.F Kurose and K.W. Ross, All Rights Reserved Wireless, Mobile Networks 6-1
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,Mobile Networks 6-2
Wireless, Mobile Networks 6-2 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
Chapter 6 outline 6.1 Introduction Mobility Wireless 6.5 Principles:addressing and routing to mobile 6.2 Wireless links, users characteristics ·CDMA 6.6 Mobile IP 6.3 IEEE 802.11 wireless 6.7 Handling mobility in LANs ("Wi-Fi") cellular networks 6.4 Cellular Internet 6.8 Mobility and higher-layer Access protocols ■architecture standards(e.g,GSM） 6.9 Summary Wireless,Mobile Networks 6-3
Wireless, Mobile Networks 6-3 Chapter 6 outline 6.1 Introduction Wireless 6.2 Wireless links, characteristics CDMA 6.3 IEEE 802.11 wireless LANs (“Wi-Fi”) 6.4 Cellular Internet Access architecture standards (e.g., GSM) Mobility 6.5 Principles: addressing and routing to mobile users 6.6 Mobile IP 6.7 Handling mobility in cellular networks 6.8 Mobility and higher-layer protocols 6.9 Summary
Elements of a wireless network network infrastructure Wireless,Mobile Networks 6-4
Wireless, Mobile Networks 6-4 Elements of a wireless network network infrastructure
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,Mobile Networks 6-5
Wireless, Mobile Networks 6-5 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
Elements of a wireless network base station 必 typically connected to wired network relay-responsible for sending packets network between wired network infrastructure and wireless host(s)in its“area' e.g.,cell towers, 802.11 access points Wireless,Mobile Networks 6-6
Wireless, Mobile Networks 6-6 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
Elements of a wireless network wireless link—, typically used to connect mobile(s)to base station also used as backbone link network infrastructure multiple access protocol coordinates link access various data rates. transmission distance Wireless,Mobile Networks 6-7
Wireless, Mobile Networks 6-7 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
Characteristics of selected wireless links 200 802.11n 54 802.11a,g 802.11a,g point-to-point 5-11 802.11b 4G:LTWE WIMAX 4 3G:UMTS/WCDMA-HSPDA,CDMA2000-1xEVDO ajeJ 1 802.15 384 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,Mobile Networks 6-8
Wireless, Mobile Networks 6-8 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 200 802.11n Data rate (Mbps)
Elements of a wireless network infrastructure mode base station connects mobiles into wired network 冬 handoff:mobile network changes base station infrastructure providing connection into wired network Wireless,Mobile Networks 6-9
Wireless, Mobile Networks 6-9 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
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,Mobile Networks 6-10
Wireless, Mobile Networks 6-10 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