index_S

S

SAPIs, 356

defined, 356-57

LLC, identifiers (LLC SAPI), 339

network (NSAPI), 338

Security, 96-98

authentication, 96

call ciphering, 98

identity verification, 98

user identity confidentiality, 96-97

Segmentation

for acknowledged transmission mode, 371

LLC PDUs into RLC data blocks, 238-39

RLC/MAC control messages, 245-46

SNDCP, 371

for unacknowledged transmission mode, 372

See also Reassembly

Service access point identifiers. See SAPIs

Service access points (SAPs), 292

Service data units (SDUs), 52

erroneous, delivery of, 54

error ratio, 54

format information, 54

maximum size , 54

Serving GPRS support nodes (SGSN), 61, 63

addressing, 279

blocking example, 288

connection, 63

defined, 63

flush procedure initiated by, 298-300

interface between MS and, 66

mobility management between, 351, 353

packet transmission between MS, 355-80

paging procedures initiated by, 295

PCU at, 85, 88

PDP context deactivation initiated by, 345-46

PDP context modification initiated by, 347-48

test procedure initiated by, 290

See also GPRS

Session management (SM) protocol, 67, 342-43

Short message service (SMS), 9

Signaling connection control part (SCCP), 68

Signaling plane, 66-72, 319-53

BSS, 86-88

defined, 66-67

Gc interface, 70

Gd interface, 71

Gf interface, 70

Gr interface, 69

Gs interface, 71

GSN-GSN, 67-68

MS-SGSN, 67

SS7 signaling interface, 68-72

Signaling procedures

between GMM SAPs, 295-98

between NM SAPs, 298-306

between PFM SAPs, 306-7

Signal-to-noise ratio (SNR), 159, 160

SI messages

defined, 182

scheduling, 182-84

types of, 185

Sliding window mechanism, 240-41

defined, 240

illustrated , 242

at transmit side, 241

Slow associated control channel (SACCH), 18, 21-22

SNS sublayer, 280-85

network configuration, 280-81

signaling procedure, 281-85

See also NS layer

Soft decisions, 149-50

SPLIT_PG_CYCLE

BSIC decoding on neighbor cells , 253

choice of value, 253

defined, 249

high value, 253

impact, 249

performed measurements, 249-53

value determination, 249-53

value range, 251-53

SS7 signaling

Gc interface, 70

Gd interface, 71

Gf interface, 70

Gr interface, 69

Gs interface, 71

protocols, 68-69

Stand-alone dedicated control channel (SDCCH), 18, 22-23

State variable management, 361-62

STATUS ENQUIRY message, 282, 284, 285

elements, 282

sending, 284

STATUS message, 282, 284, 285

Stealing flags (SFs), 28

mapping between coding scheme and, 114

pattern, 113

Streaming class, 53

Subnetwork-dependent convergence protocol (SNDCP), 66, 355

case study, 371-80

compression features, 364

defined, 355-56

format frame description, 365-66

layer, 363-71

to LLC layer (buffer usage), 372-75

LLC layer to (buffer usage), 375-80

multiplexing of N-PDUs, 366-67

PDU header fields, 366

protocol control information compression, 369

segmentation/reassembly, 371

user data compression, 369-70

Subscriber identity module (SIM) cards, 6

Switched virtual circuits (SVCs), 271

Synchronization bursts (SBs)

defined, 32

structure, 33

Synchronization channel (SCH), 17

Synthesizers, 170-73

frequency precision, 170

lock time performance, 171-73

phase noise performance, 171