Cellular Telecommunications Glossary [T - Z]
- a glossary of terms used with cell phone or cellular telecommunications technology
- TACS - Total Access Communications System.
- This was the first generation analogue system developed by Motorola that was used in the UK and many other countries around the world.
- TCP/IP - Transmission Control Protocol / Internet Protocol.
- This is a protocol that defines the way in which data is transmitted in a secure manner between networks. It forms the basis for the Internet.
- TDD - Time Division Duplex.
- A scheme to allow (virtually) simultaneous transmission in both directions. The uplink and downlink transmissions use the same frequency, but are allocated different time slots.
- TDMA - Time Division Multiple Access.
- A system that that enables multiple users with access to a mobile phone network by allocating them different time slots within a transmission. This scheme is used by GSM, NA-TDMA, and PDC.
- TD-SCDMA - Time Division Synchronous Code Division Multiple Access.
- A 3G system that originates from China and uses TDD techniques.
- TIA - Telecommunications Industry Association.
- A US telecommunications standards body that was responsible for the generation of IS-2000, the standard for the Third Generation CDMA system (CDMA2000).
- UMTS - Universal Mobile Telecommunications System.
- The 3G follow on system to GSM that is standardised by ETSI under 3GPP. It uses Wideband CDMA (W-CDMA) with a 5 MHz channel bandwidth.
- Uplink -
- The path from the mobile terminal to the base station. This term is normally associated with GSM and UMTS networks.
- USIM - Universal Subscriber Identity Module.
- The subscriber identity module used in UMTS phones.
- UTRAN - UMTS Terrestrial Radio Access Network.
- The air interface (i.e. radio access) portion of UMTS networks as specified within 3GPP.
- Walsh codes -
- A family of orthogonal codes widely used for CDMA transmissions. They are one of a group of specialized PN (pseudonoise) codes that have good autocorrelation properties while exhibiting low levels of cross-correlation.
- WAP - Wireless Application Protocol.
- It is a widely used set of protocols used on wireless devices such as mobile phones and PDAs. It operates much like the hypertext transfer protocol and standardizes the manner in which wireless devices are able to access parts of the Internet, such as e-mail and the Web.
- W-CDMA - Wideband CDMA.
- The 3G transmission standard used for UMTS, the successor to GSM. It uses DSSS to provide code vision multiple access with a bandwidth of 5 MHz.
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