Siemens IEEE802.11 - Manual (Page 81)

WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt Page 81 © Siemens, 2002
HLR
SGSN
SIM
loose coupling (SIM)
HLR
RADIUS
loose coupling (RADIUS)
WLAN loosely coupled to a Mobile
Network
n
Each hotspot is SS7 endpoint
– SIM cards required
– SGSN or MSC functionality
at access network
n
Tight userbase to HLR
– Standalone capability
– Flexibility in security