Hytera DMR System Planner
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When the mobile terminal is roaming, the corresponding status icon and the master
site (channel) alias will be displayed on the LCD. Also you can determine whether
the terminal is searching or staying on the site with the help of the LED.
2.7.1 Roaming Methods
The type of roaming method includes auto site roam and active site roam.
2.7.1.1 Auto
Site
Roam
If the Roaming feature is enabled and the signal strength value of the current
channel falls below the pre-programmed RSSI threshold, the mobile terminal will
keep detecting the signal strength of each channel (site) in the roam list, select one
with the strongest signal, and regard it as the master site. Afterwards, the mobile
terminal will stay on this site. Once the signal strength of the master site falls below
the RSSI threshold, the mobile terminal will try to find a new master site. If a better
site is not found, it will still identify the previous channel as its own master site. If the
mobile terminal comes across other activities while performing the auto site roam, it
will identify the current repeater as the master site. In addition, all sites in the roam
list will be ranked according to their signal strength, so as to achieve better roaming
performance. Sites that have been detected in previous roam and are assumed to
be near by are searched before those that have not been detected before.
Additionally, when the mobile terminal is roaming, it will detect the current master
site during the interval of checking other two sites, to minimize the duration away
from the master site. This strategy gives the priority to the previous master site and
minimizes the possibility of missing transmissions in the process of roaming.
When the auto site roam is initiated, the mobile terminal will be temporarily away
from the master site and detect other sites. In this case, it may miss the
communication with the master site. In other words, auto site roam shall occur when
the mobile terminal is so far from the master site that its signal strength had
deteriorated below the RSSI threshold or when there is no signal at all.
Both the activation of auto site roam and site selection are subject to the repeater
transmission. If there is no activity in the system and the repeater stops transmission,
auto site roam can not detect any repeater. Consequently, the repeater can be
configured to send the beacon periodically in case of no transmission and
interference. Both the beacon duration and interval can be set.
In the event of no activity in the system, the mobile terminal will use the signal
strength of the beacon to determine whether it is required to roam and which site it
should roam to. If the mobile terminal does not receive the beacon within the interval,
it is deemed to be out of the repeater’s range and roams to another site.
Summary of Contents for PD70X Series
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Page 4: ...Revision History Version Date Description Remarks R1 0 November 21 2012 Initial release ...
Page 126: ...Hytera DMR System Planner 122 Figure 1 4 Analog to digital Conversion 2 ...
Page 174: ...Hytera DMR System Planner 170 For your notes ...
Page 178: ...Hytera DMR System Planner 174 For your notes ...
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