05-02-2013, 01:00 PM
Unlicensed Mobile Access (UMA )
Unlicensed Mobile.ppt (Size: 607 KB / Downloads: 34)
UMA History
Development of UMA inspired by the rapid deployment of broadband and wireless LANs within homes.
Wanted to create a high bandwidth, low-cost wireless access network.
Several major leading mobile operators and network equipment vendors collaborated and formed the Unlicensed Mobile Access Consortium (UMAC), to promote the Unlicensed Mobile Access (UMA) technology and develop specifications for it.
Handing Off Connection
UMA device on cellular network
Finds suitable Wi-Fi network in range
Device will analyze network and determine if connect or not
Connect to UMA controller and negotiate switch with cell network
Inside UMA
UMA protocol stored within the radio of the device.
Tunnels through other radio layers to get to mobile network
Requires an IP interface to connect to the internet
IPsec module deals with tunnel to UMA controller
VoIP
Transferring voice over internet is a costly endeavor
Codecs used in traditional VoIP clients are costly
AMR (Adaptive Mult-Rate) used to provide cheap, effective transmission
Same as used already on phones
Already optimized for low power consumption
UMA Deployment
Wireless Control System gives support to standalone Access Points and also Wireless LAN Controller
Wireless Control System also provides statistics on calls being made, WiFi Channel performance and coverage planning
Access Points improve call quality and WiFi channel capacity to phones which are unable to to support 802.11 1n protocol