Index_V

V

Variable length coding (VLC) techniques, 106

VAX computer, barcode files from, 452

VBScript, 21

Vector

graphics, 97, 98

-sum excited linear predictive coding (VSELP), 155

Venture capital, 430

VeriSign wireless trust services, 506

Verizon, 190, 438

CDMA used by, 57

Wireless, 436, 439, 442

Vertical handoff(s)

intelligent management of, 416

translation of mobility profiles during, 422

Video

calling, face-to-face, 28

camera, 25

compression

algorithms, 78

standards, 106, 107, 109, 110

technology, 78

data

end-to-end delivery of compressed, 111

MPEG, 111

decoded, 120

encoding

delay, 487

techniques, scalable, 107

over IP, 470

QoS metrics, 485

real-time, 78

Redundancy Coding Header, 111

server, 273

streaming architecture, cross layer design, 118

Videoconferencing, use of H.263 in, 108

Videophone, 471

Video telephony, mobile, 469–495

end-to-end system architecture, 470–473

mobile networks for video telephony, 473–474

performance issues in, 484–493

error resilience and QoS, 484–485

RTCP performance, 491–493

SIP signaling delay, 488–491

video QoS metrics, 485–487

video quality results for 3G-324M, 487–488

standards for, 474–483

circuit-switched, 475–479

packet-switched, 479–483

Virtual Bottleneck Cell, 218

Virtual circuits, 292

Virtual connection tree, 271, 277

Virtual tree

-based rerouting, 270

number of nodes in, 279

setup time, 279

teardown time, 279

Viruses, 65

Visa card holders, WAP location service for, 191

Visitor location register (VLR), 353, 368, 410

VLC techniques, see Variable length coding techniques

VLR, see Visitor location register

Vodaphone, 439

Voice

coding, 151, 154

communication, QoS management for, 150

decoding, rate of, 177

information

high-quality, 318

synchronous, 319

packets

digitized, 153

RLP function and, 163

RTP, 167

payload design, GPRS VoIP, 176

portals, 19

quality

inferior, 181

network, 156

services, success of wireless, 149

signal coding, 156

traffic bursts, 179

Voice over IP (VoIP), 150, 470, 479, see also VoIP services

call(s)

seamless switched, 373

setup, performance of, 166

designer, 177

gateways, 222

implementation, high-level view of, 165

SIP signaling for, 162

traffic blocking, 178

Voicestream, 57

VoIP, see Voice over IP

VoIP services, 149–183, see also Voice over IP

basis of voice coding, 154–155

H.323 implementation architecture, 165–175

analysis of RTCP:CNAME packet delay, 169–170

average H.323 call setup delay, 172

average TCP packet transmission delay, 171–172

delay analysis of H.323 control signaling over wireless, 168–169

experimental verification, 172–175

H.323 call setup message delay analysis, 170–171

media packet-blocking analysis in GPRS, 175–180

network quality requirements, 155–158

overview of H.323 protocol, 158–161

overview of SIP, 161–163

RLP, 163–165

wireless networks, 151–154

VSELP, see Vector-sum excited linear predictive coding