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WLAN – UMTS Interworking:
Ancient approach: 'tight coupling'
BTS
Node B
Node B
wlan local access network
WLAN as just another radio access technology of UMTS
n
All UMTS services become available over WLAN.
but:
n
PLMN is burdened with high bandwidth WLAN traffic.
n
Wi-Fi does not provide all the functionality needed (QoS, security).
WLAN-IEEE802.11 Tutorial (Maximilian Riegel), 021018-wlan-tutorial.ppt
BTS
MSCS
TDM / ATM / IP
BSC
HSS
PLMN core
RNC
SGSN
PLMN access
MSCS
SCP LNP
AUC
VLR
IN
GGS
N
internet
PSTN
Page 76
© Siemens, 2002
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