BSSAP

SS7 protocol suite
SS7 protocols by OSI layer
Application

INAP, MAP, IS-41...

TCAP, CAP, ISUP, ...
Network MTP Level 3 + SCCP
Data link MTP Level 2
Physical MTP Level 1

BSS Application Part (BSSAP) is a protocol in Signaling System 7 used by the Mobile Switching Center (MSC) and the Base station subsystem (BSS) to communicate with each other using signalling messages supported by the MTP and connection-oriented services of the SCCP. For each active mobile equipment one signalling connection is used by BSSAP having at least one active transactions for the transfer of messages[1]

BSSAP provides two kinds of functions:

References

  1. 3GPP TS 48.008 Mobile Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification
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