| Term | Description |
UI | UI - User Interface
|
Um | Um - The air interface between the BTS and the MS in a GSM network
|
UMTS | UMTS - Universal Mobile Telecommunications System. A third-generation (3G) wireless communications technology and the next generation of GSM. UMTS is a wireless standard approved by the International Telecommunications Union and is intended for advanced wireless communications.UMTS uses WCDMA technology, and the two terms are often used interchangeably with each other.
|
UPN | UPN - Universal Personal Number
|
UPT | UPT - Universal Personal Telecommunications
|
URL | URL - Uniform Resource Locator; the addressing system of the Internet
|
USIM | USIM - Universal Subscriber Identity Module; the 3G equivalent of the GSM SIM
|
USO | USO - Universal Service Obligation
|
UTRA | UTRA - Universal Terrestrial Radio Access; the air interface component of WCDMA.
|
UTRAN | UTRAN - Universal Terrestrial Radio Access Network; the UMTS radio access network comprising the RNC, Node B and the air interface
|
Uu | Uu - The air interface between the Node B and the MS in a UMTS network.
|
UWB | UWB - Ultra Wide Band
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