56 System Feature Overview
April 2011 68007024085
For all modes, it is not recommended to have any non-GPS data on the GPS Revert channel. The
only exception is Capacity Plus mode where ARS data is also supported on the GPS Revert
channel. The system throughput is dependent on the window size selected for the system and the
percentage of windows reserved for periodic updates. The table below summarizes system
throughput:
NOTE: These numbers are based on good signal conditions. The actual throughput and reliability
may vary with RF conditions and voice call loading. For more details on loading-reliability
relationship, see Section 4.4.5.6 “Enhanced GPS Revert – Loading & Reliability”.
The Enhanced GPS feature can be configured in the following manner in:
1. Conventional single-site and IPSC modes:
1.1. One slot for voice, one slot for Enhanced GPS Revert
1.2. One slot for GPS Revert, one slot for Enhanced GPS Revert
1.3. Both slots for Enhanced GPS Revert
2. Capacity Plus mode:
2.1. One slot of data revert repeater for GPS/ARS, one slot for all other data
2.2. Both slots for Enhanced GPS Revert
More details in Sections 3.2.2.1.5.1 “Single Site Conventional”, 3.2.2.1.5.2 “IP Site Connect Mode”
and 3.2.2.1.5.3 “Capacity Plus Mode”.
2.4.3.5.1 ARS Initialization Delay
Upon power on, subscribers normally register with the Presence Notifier by sending ARS
messages immediately. In a scenario where a user has a system with many subscribers powering
on within a short time, there can be many collisions between ARS registration messages. To
reduce collisions, a user can configure the maximum value of an initial random delay for ARS
registration via the CPS. This field is called “ARS Initialization Delay” and has a range of 0 minutes
to 4 hours with a default value of 0 minutes.
A value of “0 minutes” defines that the ARS registration message will be sent out between 5
seconds and 15 seconds and this feature is essentially not delayed (5 seconds to 15 seconds was
the existing delay in ARS registration prior to R01.07.00). If a user selects a value of “30 minutes”,
then the subscriber randomly chooses a time between 5 seconds and 30 minutes and sends the
Window
Size
Number of Updates per Minute per Slot
90% 75% 60% 45%
5
180
150 120 90
6
150
125 100 75
7
128
107 86 64
8
112
93 75 56
9
100
83 66 50
10
90
75 60 45
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