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U-APSD - Unscheduled - Automatic Power Save Delivery
U-CSI
U-RNTI - UTRAN Radio Network Temporary Identifier
U - interface
U - Unnumbered
U/L - Uplink
UA - Unnumbered Acknowledgement
UA Channel - User Asynchronous data Channel
UAC - User Agent Client
UAN - Universal Access Number
UARFCN - UMTS Absolute Radio Frequency Channel Number
UAS - User Agent Server
UCD - Uplink Channel Descriptor
UDI - Unrestricted Digital Information
UDP - User Datagram Protocol
UDT - UNITDATA
UDTS - UNITDATA Service
UE - User Equipment
UG-CSI
UGS - Unsolicited Grant Service
UHF - Ultra High Frequency
UI - Unconfirmed Information
UI - Unnumbered Information
UI Channel - User Isochronous data Channel
UIM - User Identity Module
UIUC - Uplink Interval Usage Code
UL-MAP - Uplink Map
ULF - Ultra Low Frequency
Um - Air Interface (3GPP2)
Um - Air Interface (GSM)
UM - Unacknowledged Mode
UM - Unacknowledged Mode (RLC)
UM - Unassured Mode
UM - Unified Messaging
UMA - Unlicensed Mobile Access
UMAN - Unlicensed Mobile Access Network
UMD - Unacknowledged Mode Data
UMTS - Universal Mobile Telecommunications System
Unbalanced line
UNC - Unlicensed Network Controller
UNI - User to Network Interface
Unicode
Unidirectional channel
Unique Challenge Response Procedure
UNIX™
Unnumbered command
Unnumbered response
Uplink
Uplink DPCH - Uplink Dedicated Physical Channel
UPnP - Universal Plug & Play
Upper Layers
Upstream
UPT - Universal Personal Telecommunications
URA - UTRAN Registration Area
URI - Uniform Resource Identifier
URL - Uniform Resource Locator
URLC - UMA Radio Link Control
URR - UMA Radio Resource
US-TDMA
US Channel - User Synchronous data Channel
USAT - Ultra Small Aperture Terminal
USAT - UMTS SIM Application Toolkit
USB - Universal Serial Bus
USCH - Uplink Shared Channel
User
User information
User Zone
User Zone Registration
USF - Uplink State Flag
USIM - UMTS Subscriber Identity Module
USSD - Unstructured Supplementary Service Data
USTS - Uplink Synchronous Transmission Scheme
UT - Universal Time
UTP - Unshielded Twisted Pair
UTRA - Universal Terrestrial Radio Access
UTRAN - UMTS Terrestrial Radio Access Network
Uu - UMTS Air Interface
UUS - User-to-User Signalling
UV - Ultraviolet
UWC-136
UWCC - Universal Wireless Communications Consortium

 

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