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GENERALCALL SERVER : MOBILITY
Ed. 04 3/4Réf. 3EH 21000 BSAA
AVAILABLE FEATURES
Mobility management
- roaming
- intracell handover (on the same base station)
- intercell handover (between base stations).
System access and dynamic channel selection
Before making or receiving calls, the handset must obtain information about the environment in which
it is being used to ensure that it does in fact have access to the system.
To enable the handset to synchronize itself with the system, each base station is always active on at
least one radio channel (the dummy bearer), broadcasting information concerning the system and its
identity.
Any handset will thus be able to recognize the system coverage area in which it is working. When on
standby, each handset is tuned to the nearest base station, receptive to search messages indicating an
incoming call.
Channels are allocated dynamically when requested by the handset. Once synchronized with the sys-
tem, the handset decides on the most appropriate channel for a communication. It chooses the least
disrupted of the free channels.
Inter- and intra-cell handover procedures
The coverage radius of a DECT radio base station forms a "cell".
Intercell handovers to another cell are commanded by the handset when the signal from the active
base is weak and there is a stronger base in the vicinity. During the communication, the mobile re-
quests an appropriate available channel from the second base. Once the second link has been esta-
blished, it releases the first one, maintaining the communication on the second base.
If transmission errors arise, an intracell handover is performed on the same base station towards a
higher quality channel.
GAP MODE: GENERAL
By default, Alcatel DECT GAP handsets operate in proprietary mode (i.e. like Reflexes sets); third party
DECT GAP handsets usually operate in basic mode (though some may operate in advanced mode):
- basic mode: this mode offers a reduced level of operation (no enquiry call, no call waiting, no dis-
play management, etc.)
- advanced mode: this mode offers access to a level of operation essentially equivalent to that of an
analog Z terminal (all functions defined by feature access codes).
With PM5, the mode of each set can be modified individually at the registration stage.
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