| UDP |
User Datagram Protocol |
An alternative to TCP used widely in streaming audio and video applications.
UDP does not insist on retransmission of dropped packets, thus it uses bandwidth
more efficiently in applications with less need for error detection and correction. |
| UE |
User Equipment |
In a 3G UMTS network, User Equipment (also called the mobile station or
handset) includes mobile cellular telephones, handheld personal digital assistants
(PDAs), and cellular modems connected to PCs. |
| UHF |
Ultra High Frequency |
The RF spectrum between 300 MHz and 3 GHz. |
| UMTS |
Universal Mobile Telecommunications System |
Third generation telecommunications system based on W-CDMA DS. |
| UNIX |
|
A computer operating system. UNIX is designed to be used by many people at the same time and has TCP/IP built-in. It is a very common operating system for servers on the Internet. |
| uplink |
|
The transmission path from the mobile station up to the base station. |
| UPT |
Universal Personal Telecommunications |
|
| USIM |
Universal Subscriber Identity Module |
This upgrade to the SIM card enables use with IMT-2000. |
| UTRA |
UMTS Terrestrial Radio Access |
|
| UTRAN |
UMTS Terrestrial Radio Access Network |
The radio access network based on the UTRA standard. |
| UUT |
Unit Under Test |
An acronym describing some type of electrical apparatus connected to test instrumentation. The apparatus can range from a simple circuit a complex subsystem such as a mobile phone, base station or MSC. See also DUT. |
| UWC |
Universal Wireless Consortium |
Body of vendors and operators promoting and implementing the IS-136 digital standard. Also specifying the future development of the standard and facilitating roaming agreements between IS-136 operators. |
