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diff --git a/2016/osmocom_gsup/osmocom_gsup.adoc b/2016/osmocom_gsup/osmocom_gsup.adoc new file mode 100644 index 0000000..b6fe3c1 --- /dev/null +++ b/2016/osmocom_gsup/osmocom_gsup.adoc @@ -0,0 +1,47 @@ +Osmocom GSUP Protocol +===================== +Harald Welte +:copyright: Harald Welte (Liense: CC-BY-SA) +:backend: slidy +:max-width: 45em + +== GSUP basics + +* very much simplified protocol for handling procedures betewen *SGSN* and *HLR* +* procedures / primitives similar to those carried by MAP +** without the complexity of ASN.1 +** without the complexity of a TCAP/SCCP protocol stack underneath +** without the nasty segmented MAP due to limited MSU size in SS7 + +== GSUP history + +* originally developed for *SGSN* <-> *HLR* interface +* originally called 'GPRS Subscriber Update Protocol' +* implemented in OsmoSGSN (but no counter-part in Osmocom git repos?) + +== GSUP extension for 3G + +* Iu-PS was added to OsmoSGSN, requiring UMTS AKA +* GSUP authentication triplets extended to quintuples +* GSUP SendAuthInfo extended with RAND (for AKA re-sync) +* *osmo-gsup-hlr* as minimalistic HLR+AUC side implementation + +== GSUP extension circuit-switched + +* HLR must know if request is from CS(MSC) or PS(SGSN) +** introduce OSMO_GSUP_CN_DOMAIN_IE to differentiate CS/PS +* VLR must have ability to inform HLR of AUTH FAIL +** introduce OSMO_GSUP_MSGT_AUTH_FAIL_REPORT + +== Misc GSUP changes in 2016 + +* GSUP protocol definition and message encoder/decoder move to + libosmocore (gprs_gsup_* -> osmo_gsup_* rename) +* Doxygen documentation snippets added +* GSUP documentation moved to asciidoc and into osmo-gsm-manuals.git + +include::gsup.adoc[] + +== The End + +Questions? |