GPRS for Mobile Internet
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