Wireless Internet Handbook: Technologies, Standards, and Applications (Internet and Communications)

QDU, see Quantization distortion unit

QoS, see Quality-of-service

QPSK, see Quadrature phase shift keying

QRS detection program, 525

Quadrature phase shift keying (QPSK), 399

Qualcomm, 13, 60, 446

Binary Runtime Environment for Wireless (BREW), 441

code excited linear prediction (QCELP), 155

OmniTRACS product, 412

vehicle location and monitoring service, 450

Quality of service (QoS), 38, 130, 242, 470

algorithms, 28

better application, 474

classes, 78

control, 471

data transport with, 393

domain, tunneling across, 212

end-to-end, 90

error resilience and, 404

expectations, 208

guarantees, 215, 382, 415

information, RTCP and, 491

management, 150, 163

parameters, 110, 215

profile

attributes, 91

E-GPRS, 85

GPRS, 85, 86

streaming media, 99

receiver signal, 130

reports, 80, 473, 493

requirements, 86, 116, 119

signaling, 481

support, 214, 215

user perception of, 375

video, 485

Quantization distortion unit (QDU), 156

Quasihierarchical clustering, shortcoming of, 145

Quasihierarchical routing, 142

Query-update access patterns, 369

QWERTY keyboard, 188