Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
Chapter 6 Wireless and Mobile Networks - Network and Systems Lab Chapter 6 Wireless and Mobile Networks - Network and Systems Lab
IEEE 802.11 Wireless LAN 802.11b 2.4-5 GHz unlicensed spectrum up to 11 Mbps direct sequence spread spectrum (DSSS) in physical layer • all hosts use same chipping code 802.11a 5-6 GHz range up to 54 Mbps 802.11g 2.4-5 GHz range up to 54 Mbps 802.11n: multiple antennae 2.4-5 GHz range up to 200 Mbps all use CSMA/CA for multiple access all have base-station and ad-hoc network versions 6: Wireless and Mobile Networks 6-18
802.11 LAN architecture BSS 1 AP Internet hub, switch or router AP wireless host communicates with base station base station = access point (AP) Basic Service Set (BSS) (aka “cell”) in infrastructure mode contains: wireless hosts access point (AP): base station ad hoc mode: hosts only BSS 2 6: Wireless and Mobile Networks 6-19
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IEEE 802.11 <strong>Wireless</strong> LAN<br />
802.11b<br />
2.4-5 GHz unlicensed spectrum<br />
up to 11 Mbps<br />
direct sequence spread<br />
spectrum (DSSS) in physical<br />
layer<br />
• all hosts use same chipping<br />
code<br />
802.11a<br />
5-6 GHz range<br />
up to 54 Mbps<br />
802.11g<br />
2.4-5 GHz range<br />
up to 54 Mbps<br />
802.11n: multiple antennae<br />
2.4-5 GHz range<br />
up to 200 Mbps<br />
all use CSMA/CA for multiple access<br />
all have base-station <strong>and</strong> ad-hoc network versions<br />
6: <strong>Wireless</strong> <strong>and</strong> <strong>Mobile</strong> <strong><strong>Network</strong>s</strong> 6-18
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