- seamless handoff from WiFi to cellular networks,
- converging the fixed and mobile worlds
- under the control and billing of the mobile operator
- a new network element (the UMA Network Controller, UNC)
- UNC interfaces into the core network via existing 3GPP specified A/Gb interfaces.
- protocols for the secure transport of GSM/GPRS signalling and user plane traffic over IP.
in contrast, uses the Internet for routing
Issues
- WLAN couldn’t really support it due to the hand-off issues among APs.
- Extricom selling 8 and 24-port WLAN switches
- client on the network associates to the switch, not the radio/AP
- No de-association or re-association
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