Rahul Sharma (Editor)

BSSAP

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Network
  
MTP Level 3 + SCCP

Physical
  
MTP Level 1

Data link
  
MTP Level 2

Application
  
INAP, MAP, IS-41... TCAP, CAP, ISUP, ...

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

BSSAP provides two kinds of functions:

  • The BSS Mobile Application Part (BSSMAP) supports procedures to facilitate communication between the MSC and the BSS pertaining to resource management and handover control.
  • The Direct Transfer Application Part (DTAP) is used for transfer of those messages which need to travel directly to a Mobile equipment from MSC bypassing any interpretation by BSS. These messages are generally pertaining to Mobility management (MM) or Call Management (CM).

    • References

    BSSAP Wikipedia
    (Text) CC BY-SA