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There are 23 names in this directory beginning with the letter U.
UCD: Uplink Channel Descriptor

Uplink Channel Descriptor (UCD) is a concept in the IEEE 802.16 (WiMAX) network, which describes the uplink burst profile (i.e., modulation and coding combination) and preamble length for each UL burst.

UDLP: UniDirectional Link Protocol

UniDirectional Link Protocol (UDLP) is used by inexpensive, receive-only antennas to receive data via satellite.

UE: User Equipment

User Equipment (UE) refers to eqiment in a wireless network that enables users to communicate through wireless communication networks.

UGS: Unsolicited Grant Service

Unsolicited Grant Service (UGS) is one of the five QoS service types defined in the IEEE 802.16 WiMAX. The 802.16 protocol supports five types of QoS — UGS (Unsolicited grant service), rtPS (Real time polling Service), ertPS (Extended Real-time POLLING SERVICE), nrtPS (Non-real-time polling service and BE (Best effort service). The Unsolicited Grant Service (UGS) is designed to support real-time service flows that generate fixed-size data packets on a periodic basis, such as T1/E1 and Voice over IP without silence suppression. The service offers fixed-size grants on a real-time periodic basis, which eliminate the overhead and latency of SS requests and assure that grants are available to meet the flow’s real-time needs.

UHF: Ultra High Frenquency

Ultra High Frenquency (UHF) refers to the RF spectrum between 300 MHz and 3 GHz.

UICC: USIM Integrated Circuit Card

USIM Integrated Circuit Card (UICC) is the chip card used in mobile terminals in 3G telecom network systems. The UICC is an essential component for UMTS, just as the SIM for GSM. Extending the concept of the SIM card, the UICC contains the USIM application and also provides a platform for other IC Card applications. It ensures the integrity and security of all kinds of personal data, enabling secure support for all kinds of multi-application schemes.

UIM: User Identity Module

User Identity Module (UIM), also known as R-UIM, is the SIM card equivalent planned for W-CDMA handsets. UIM supports roaming between CDMA and GSM networks.

Ultra Wideband

Ultra Wideband is a wireless networking approach that broadcasts millions of tiny pulses at trillionth-of-second intervals using very low power over enormous swaths of spectrum. In comparison, traditional radios broadcast continuously on tiny bits of spectrum. Ultra Wideband is commonly abbreviated to UWB.

UMSC: UMTS Mobile Switching Center

UMTS Mobile Switching Center (UMSC), a type of Mobile Switching Center (MSC), is the place that provides UMTS 3G wireless telephony switching services and controls calls between telephone and data systems.

UMTS: Universal Mobile Telecommunication

Universal Mobile Telecommunications System (UMTS) is a 3G cellular network technology that uses WCDMA (Wideband Code Division Multiple Access) technologies. The transmission rates range from a theoretical 384K bit/sec for mobile phones to 2M bit/sec for stationary devices.

UPT: Universal Personal Telecommunicatio

Universal Personal Telecommunications (UPT) is a set of standards developed by the CCITT for wireline personal communications.

Urban cells

Urban cells is the coverage provided by base stations located in urban areas. The radius of these cells is usually much smaller than suburban and rural cells due to the more difficult propagation environment

USDC: United States Digital Cellular

United States Digital Cellular (USDC), also known as IS-54 (Interim Standard 54), was developed to replace the AMPS standard, particularly in urban areas where AMPS did not provide adequate channel capacity. USDC allows the co-existence of AMPS so that providers can gradually phase out AMPS as needed. USDC utilizes TDMA to offer phone and paging service over a 25 kHz channel divided into two time slots.

USIM: Universal Subscriber Identity Modu

Universal Subscriber Identity Module (USIM), also known as Upgrade SIM, is a component in the UMTS 3G network that securely stores the key identifying a mobile phone service subscriber, as well as subscription information, saved telephone numbers, preferences, text messages and other information. It is equivalent to the Subscriber Identity Module (SIM) in the GSM 2G wireless network.

USIM: Upgrade SIM

Upgrade SIM (USIM), also known as Universal Subscriber Identity Module, is an enhanced version of the SIM card, which is for use with IMT-2000/UMTS 3G network.

UTRA: UMTS Terrestrial Radio Access

UMTS Terrestrial Radio Access (UTRA) is a term used for UMTS radio access solution, applied to W-CDMA and TD-CDMA .

UTRAN LTE: UMTS Terrestrial Radio Access

UMTS Terrestrial Radio Access Network Long Term Evolution (UTRAN LTE), sometimes also referred to as 3G LTE or Super-3G, is the 3GPP radio technology evolution architecture.

UTRAN: UMTS Terrestrial Radio Access Net

UMTS Terrestrial Radio Access Network (UTRAN) is the radio access network based on the UTRA standard term describing the Radio Network Controllers and Node Base stations of a UMTS network. The UMTS network, built around an IP-optimized core network carrying all traffic types. UTRAN will support both UTRA Frequency Division Duplex (FDD) and Time Division Duplex (TDD) radio interfaces allowing flexible, high-bandwidth support, and will be connected to an IP-optimized core network through a UTRAN Gateway.

UUT: Unit Under Test

Unit Under Test (UUT) refers to some type of electrical apparatus connected to test instrumentation. The apparatus can range from a simple circuit to a complex subsystem such as a mobile phone, base station or MSC.

UWB: Ultra-Wide-Band

Ultra-Wide-Band (UWB), also called digital pulse, is a wireless technology defined in IEEE 802.15.3 for transmitting digital data over a wide swath of the radio frequency spectrum with very low power. Because of the low power requirement, it can carry signals through doors and other obstacles that tend to reflect signals at more limited bandwidths and a higher power. It can carry large amounts of data (maximum bandwidth of 1Gbps) and can be used for multimedia content transfer, high-resolution radar, ground-penetrating radar, and radio locations systems.


Universal Wireless Communications 136 (UWC-136) is proposed by the TIA and adopted by the ITU for 3G TDMA standard. It allows the US TDMA community to migrate from 1st (IS-136) to 3rd (UWC-136) generation systems. The standard uses a wideband TDMA technique.

UWC: Universal Wireless Consortium

Universal Wireless Consortium (UWC) is an organization 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.

UWCC: Universal Wireless Communications

Universal Wireless Communications Consortium (UMCC) is an industry group supporting IS-136 time division multiple access and IS-41 wireless intelligent network technology.

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