Elements of a wireless network base station 角 typically connected to wired network relay-responsible for sending packets between wired network and wireless wired network host(s)in its“area” infrastructure e.g.,cell towers,802.11 access points Wireless and Mobile Networks:7-6
Elements of a wireless network Wireless and Mobile Networks: 7- 6 wired network infrastructure 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 wireless link 《》 typically used to connect mobile(s)to base station,also used as backbone link multiple access protocol coordinates link access wired network various transmission rates and distances, infrastructure frequency bands Wireless and Mobile Networks:7-7
Elements of a wireless network Wireless and Mobile Networks: 7- 7 wired network infrastructure wireless link ▪ typically used to connect mobile(s) to base station, also used as backbone link ▪ multiple access protocol coordinates link access ▪ various transmission rates and distances, frequency bands
Characteristics of selected wireless links 14 Gbps 802.11ax 10 Gbps 5G 3.5 Gbps 802.11ac 802.11af,ah 600 Mbps 802.11n 4G LTE 54 Mbps 802.11g 11 Mbps 802.11b 2 Mbps Bluetooth Indoor Outdoor Midrange Long range outdoor outdoor 10-30m 50-200m 200m-4Km 4Km-15Km Wireless and Mobile Networks:7-8
Characteristics of selected wireless links Wireless and Mobile Networks: 7- 8 Indoor Outdoor Midrange outdoor Long range outdoor 10-30m 50-200m 200m-4Km 4Km-15Km 2 Mbps 4G LTE 802.11ac 802.11n 802.11g 802.11b 3.5 Gbps 600 Mbps 54 Mbps 11 Mbps Bluetooth 14 Gbps 802.11ax 10 Gbps 5G 802.11 af,ah
Elements of a wireless network infrastructure mode base station connects mobiles into wired network handoff:mobile changes base station wired network providing connection into wired infrastructure network Wireless and Mobile Networks:7-9
Elements of a wireless network Wireless and Mobile Networks: 7- 9 wired network infrastructure infrastructure mode ▪ base station connects mobiles into wired network ▪ handoff: mobile changes base station providing connection into wired network
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
Elements of a wireless network 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