Product manual

System description, DECT air interface
Technical Product Manual - DCT1800-GAP
TD 92093 (1/LZBNB 103 108 R4D) / 2006-03-09/ Ver.C
© 2006
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Note:
Features are specified for the Portable Part (PP) and the Fixed Part (FP) whereas procedures are
implemented in the Portable radio Termination (PT) and the Fixed radio Termination (FT).
Portable parts must support more features than fixed parts. This enables operators to add optional
features to their DECT networks (competitive edge) with the knowledge that portable parts can make
use of them.
6.6.1 Features, procedures, messages and information elements
A DECT cordless system must support features which are specified in the applicable profile. Features
are for example ‘Outgoing call’, ‘Register recall’, ‘Authentication of user’, etc. The Public Access Profile
(PAP) for example does not support the feature ‘Incoming call’. See paragraph
6.6.3 for a description
of features.
Features and procedures
A feature is implemented by an ordered sequence of procedures which are specified in a profile. For
example the feature ‘Incoming call’ is implemented by the following sequence of procedures specified
in GAP:
• Incoming call request
• Incoming call confirmation
• Portable terminal alerting
• Incoming call connection
A procedure not only specifies which messages are sent but also the sequence in which they are
sent. For example the ‘Incoming call request’ procedure in GAP is implemented by the message ‘Call
Control setup (CC-setup)’. No message ‘Call Control acknowledge (CC-ack)’ is required.
Messages and information elements
A message contains a number of information elements some of which are mandatory and others are
optional or not allowed. For example the ‘Call control setup’ message in GAP must contain the following
information elements:
• Portable identity
• Fixed identity
• Basic service
•Signal
• Calling party number
Note:
The calling party information element is only required if the feature Calling Line Identification
Presentation (CLIP) is implemented. In GAP it is an optional feature.
Description of some information elements
The purpose of the ‘portable identity information’ element is to transport a DECT portable part identity
which uniquely identifies a portable part within a DECT network. A portable part can be identified for
example by the following codes:
• IPUI (International Portable User Identity)