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transcoder-free operation, 545
User Services Identity Module (USIM),
Transcoding and Rate Adaption Unit
393
(TRAU), 46, 274
User to Network Interface (UNI), 440
Transmission Control Protocol (TCP), 174
650 INDEX


UTRAN Channels, 276 Virtual Path Indicator (VPI), 440
UTRAN Registration Area, 330 Visitor Location Register (VLR), 48, 82,
Uu Interface, see Air Interface, UMTS 85
Voice Coding, 16
V42bis, 98 Voice over IP (VoIP), 21, 513
Variable Bit Rate (VBR), 464 Voice Transmission, 15
Video CODECs, 18
Virtual Channel, see Virtual Circuit Walsh-Hadamard Matrix, 32
Virtual Circuit, 12, 429 Wideband BTS (WBTS), 266
Virtual Circuit Indicator (VCI), 441 Wideband CDMA (WCDMA), 27, 288
Virtual Path, 429 Wireless Access Protocol (WAP), 83

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