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