Protocol Stack
+----------------+ | ALCAP | +----------------+ | SAAL | +----------------+ | AAL5 | +----------------+ | ATM bø | +----------------+ | Physical layer | +----------------+Access Link Control Application Part (ALCAP)
ALCAP is the protocol used for control plane of transport layer UMTS in charge of managing and multiplexing users into ATM AAL2 virtual connections. ALCAP is specified for Iub, Iur and Iu (circuit switched domain) interfaces. This protocol is only used when these interfaces are ATM-based. The ITU-T Q.2630.2 standard, AAL type 2 signalling protocol - Capability Set 2, is chosen for ALCAP protocol.
History
For Iub and Iur interfaces, ALCAP is specified in 3GPP TS 25.426. For Iu interface, ALCAP is specified in 3GPP TS 25.414.
Protocol dependencies
* STC: Signalling Transport Converter SSCOP: the SAAL sublayer that transports ALCAP signaling messages. * SSCF-NNI, MTP3b: additional layers applicable only for Iur and Iu interfaces.Read more about this topic: Alcap
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