Hytera DMR System Planner
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2.7 Roaming
Roaming is a function, which allows mobile terminals to move between sites in the
IP Multi-site Connect system without dropping connection. It is fully automatic to
users.
The Roaming feature, mainly used in the IP Multi-site Connect system, can bring
users seamless communication within the area covered by multiple repeaters.
Hytera DMR digital terminals are capable of auto roaming from one site to another
within the IP Multi-site Connect system.
A roam list can be configured to the mobile terminal. It contains a series of channels,
each of which is corresponding to a repeater in the IP Multi-site Connect system
(namely, a wide area channel). When the Roaming feature is enabled, the mobile
terminal will keep detecting the signal strength of each channel in the roam list,
select one with the strongest signal and regard it as the master site. Then the mobile
terminal will stay on this site. Once its signal strength falls below the
pre-programmed RSSI threshold value, the mobile terminal will try to find a new
master site. If a better site is not found, it will still identify the previous master site as
its own master site.
Note: The terminal cannot roam when it is in a call.
If there is no activity in the IP Multi-site Connect system, e.g. no voice or data
service transmitting, the beacon configured for the repeater will be sent
automatically. Once the terminal finds which master site is idle, it will wait for this
beacon and detect its signal strength, measuring the coverage of the site and
determining the relation between the terminal and the site. If no voice, data service,
or the beacon has been received in the expected duration, the mobile terminal will
be deemed to exceed the coverage of the master site and attempt to search for a
new master site.
As the Roaming function can be enabled or disabled via the programmable keys or
the menu, the users can not only control when and where the mobile terminal roams,
but also disable this feature to a specific site, or keep roaming to choose a proper
site.
During roaming, voice or data service is initiated, which fails to activate the repeater
at the master site at times. In this case, the terminal will search sites in the roam list
and select an appropriate one to make a call. If the right site is not found, the
out-of-range message will be given. To manually change the site, users can rotate
the Channel Selector knob to the desired channel. Then the mobile terminal always
begins to roam from this channel.
Summary of Contents for PD70X Series
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