星期六, 12月 09, 2006

Unlicensed Mobile Access

UMA Technology
  • seamless handoff from WiFi to cellular networks,
  • converging the fixed and mobile worlds
  • under the control and billing of the mobile operator
UMA Architecture
  • 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.
SIP
in contrast, uses the Internet for routing

Issues
  • WLAN couldn’t really support it due to the hand-off issues among APs.
Vendors
  • 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
UMA in the office

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