Advanced Speech Call Items

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The Advanced Speech Call Items ( ASCI ) are a group of performance features in a cellular network based on the GSM standard.

The following services are included:

  • The Voice Group Call Service VGCS
  • The Voice Broadcast Service VBS
  • The user-to-user signaling UUS
  • The user-to-dispatcher signaling , as Implicit_UUS1 referred
  • The Enhanced Multi-Level Precedence and Pre-emption service eMLPP
  • The follow-me services

There are dependencies between the individual services that prevent any subsets from being implemented in the network. For example, the Voice Group Call Service and the Voice Broadcast Service can only run to a limited extent without the Enhanced Multi-Level Precedence and Pre-emption service ; the Follow-Me services require user-to-user signaling . The user-to-dispatcher signaling is a subset of the user-to-user signaling is mentioned but separately in the specification documents due to its specific application.

The Advanced Speech Call Items are required for essential functions of a GSM-R cellular network and were specified for the first time in 1994 at the instigation of the International Union of Railways UIC ; they have been part of the GSM specifications since then.

Individual evidence

  1. ↑ 3GPP TS 51.010-3: Mobile Station conformance specification; Part 3: Layer3 Abstract Test Suite ( English , ZIP / DOC; 7.8 MB) September 16, 2005. Accessed January 10, 2010.
  2. ↑ 3GPP TS 44.068 (EN 300 948): Group Call Control (GCC) protocol ( English , ZIP / DOC; 93 kB) December 15, 2009. Accessed January 10, 2010.
  3. ↑ 3GPP TS 44.069 (EN 300 949): Broadcast Call Control (BCC) protocol ( English , ZIP / DOC; 71 kB) December 15, 2009. Accessed January 10, 2010.
  4. ↑ 3GPP TS 24.087: User-to-User Signaling (UUS); Stage 3 ( English , ZIP / DOC; 61 kB) December 18, 2009. Accessed January 10, 2010.
  5. ^ Bernhard Walke: Cellular networks and their protocols 1st 3rd edition, chap. 3, page 284. ISBN 978-3519264309