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01.61 GPRS cipher algorithm requirements
03.60 Overall GRPS logical architecture (above RL and MAC)
03.64 GPRS radio interface
04.60 RLC/MAC on PDCH
04.64 MS-SGSN LLC spec (on top of RLC/MAC)
04.65 SGSN SNDCP
08.14 BSS SGSN Gb Layer 1
08.16 BSS SGSN Gb Layer 2
08.18 BSS SGSN BSS GPRS protocol
09.95 Interworking between modified PLMN supporting legacy GPRS and GPRS mobiles
22.060 GPRS Service Spec
23.060 GPRS Radio Service Spec
29.016 SGSN - VLR Interface Gs network interface spec
29.018 SGSN - VLR Interface Gs layer3 interface spec
29.060 GPRS Tunneling (GTP) over Gn and Gp
Stack in case of nanoBTS, when HTTP request is transferred from MS:
HTTP
TCP
PPP
SNDCP
LLC
BSSGP
NS
UDP
IP
Ethernet
Identities:
IMSI SIM identity
P-TMSI allocated to each GPRS-attached MS
TLLI unambiguously identifies the logical link
NSAPI identifies PDP context associated with PDP address
MS selects unused NSAPI while PDP ctx activation
NSAPI+TLLI NSAPI+TLLI pair is unique within RA
TLLI address ranges
local derived from the P-TMSI allocated by the SGSN, valid only in one RA
foreign derived from the P-TMSI allocated in another RA
random used when MS has no P-TMSI availaible
auxiliary selected by SGSN used for anonymous access MM+PDP ctx
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