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TR 23.889 (CT4)
Feasibility study for
Local Call Local Switch (LCLS) system impacts

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V10.0.0 (Wzip)  2010/10  162 p.

Rapporteur:  Mr. Hutton, David
See also:  LCLS-related TS/TR

This TR provides a study into the Core Network impacts for providing a solution for Local Call Local Switching. The document analyses and evaluates different solutions to determine the benefits provided compared to the identified impacts.

Specific considerations are given to the following areas:
  • Sending of correlation information between the two legs of the call to the BSS
  • Triggering to enable/release Local Call Local Switch (e.g. based on activation of Supplementary Services, etc.)
  • Support of existing Supplementary Services
  • Support of existing Lawful Intercept functionality
  • Impacts to the user plane handling on the A-interface
  • Impacts to the MSC-S - MGW Interface (Mc Interface)
  • Impacts to the MSC-S - MSC-S Interface (Nc Interface)
The solution(s) considered for local call local switch should keep the core network impacts to a minimum, e.g. the impacts on the nodal functions, existing call flows, call establishment and call release.

The contents of this report when stable shall determine the modifications to existing core network specifications.


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1  ScopeWord-p. 11
2  References
3  Definitions, symbols and abbreviationsWord-p. 12
4  Requirements and Architecture
5  Working Assumptions
6  Call Setup and Call Clearing ScenariosWord-p. 16
7  General Handover PrinciplesWord-p. 23
7.0  General
7.1  Local Handover with Compatible Codec
7.2  Local Handover to Incompatible CodecWord-p. 24
7.3  General descriptions of Inter-BSS Handovers with LCLS
7.4  Inter-MSC Handover ScenariosWord-p. 29
7.5  LCLS handling when a handover failed

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