System Feature Overview 57
68007024085 April 2011
ARS when this random time elapses. This randomization of time between different subscribers
sending the ARS reduce ARS collisions at power on.
When to use:
• This feature can be used with Enhanced GPS to avoid collisions among large number of
subscribers sending ARS messages in a short period of time. However, the user must
enable “Persistent LRRP Request” in the CPS to ensure that GPS data is still sent even
if ARS is delayed.
• This feature can be used in any scenario where large number of subscribers power on,
in a short period of time and delay in ARS registration message is permitted.
When not to use:
• This feature should not be used in situations where ARS registration message is
immediately needed. For example; text messaging from server to subscriber may not
work properly if this feature is enabled.
The table below summarizes the recommended ARS initialization delay value when ARS is sent
on the Enhanced GPS channels in conventional systems (Capacity Plus and IP Site Connect
modes). The value varies with the window size and periodic loading percentage for the system.
Total Number of Radios Sending ARS based on ARS Initial Delay Value
Window
Size
Periodic
Loading
(%)
30
mins
60
mins
90
mins
120
mins
150
mins
180
mins
210
mins
240
mins
5
90 60 120 180 240 300 360 420 480
75 150 300 450 600 750 900 1050 1200
60 240 480 720 960 1200 1440 1680 1920
45 330 660 990 1320 1650 1980 2310 2640
6
90 48 96 144 192 240 288 336 384
75 123 246 369 492 615 738 861 984
60 198 396 594 792 990 1188 1386 1584
45 273 546 819 1092 1365 1638 1911 2184
7
90 42 84 126 168 210 252 294 336
75 105 210 315 420 525 630 735 840
60 168 336 504 672 840 1008 1176 1344
45 234 468 702 936 1170 1404 1638 1872
8
90 36 72 108 144 180 216 252 288
75 93 186 279 372 465 558 651 744
60 150 300 450 600 750 900 1050 1200
45 204 408 612 816 1020 1224 1428 1632
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