Motorola MOTOTRBO SYSTEM PLANNER Specifications download pdf (Page 43)

34 System Feature Overview

November, 2008

2.4.3.2 Services Provided to a Radio User

When the location service is disabled, the radio does not provide any location updates to a

location application server. An icon is displayed on the radio if the location service is enabled. The

absence of this icon indicates that the location service is disabled. The icon shows a full satellite

dish when good GPS signals are detected and an empty satellite dish when the radio is receiving

poor GPS signals.

The radio does not display its current location on its screen. With the exception of pressing the

Emergency button, a radio user cannot trigger a location update to a location application server. In

general, the radio user does not have to take any action in this process; the radio transmits the

location coordinates automatically over the system.

2.4.3.3 Services Provided to a Location Application

For all the services, a third party location application server is required to send an explicit request

to the radio. A radio does not provide unsolicited location update to a location application server.

When the radio turns on and/or selects a properly configured channel (i.e. the previously

mentioned “ARS Parameter”), the radio registers with the presence service. The location

application thus learns that this radio is on the air, and will make an explicit request for location

updates if it is configured to track the location of the radio.

The GPS equipped radios transmit an update of their location coordinates over the radio system in

response to 3 service methods.

• Single Location Update – The location application server wants to know the current location

of a radio user. In this case, the application sends a request for a single location update.

• Periodic Location Updates – Single location update is used to track the location of a radio

user by a location application server, but is an inefficient use of air interface. Location

tracking allows a location application server to periodically get the location of a radio user by

sending a single location request that contains the time interval between updates. The radio

continues to update its location periodically at the specified time interval until the request is

cancelled by the location application server. The location tracking application can configure

the radio to provide updates as frequently as once every 10 seconds. The default value is

once every 10 minutes. The rate of update is configurable in increments of 1 second and

must be matched with the resource capabilities of the radio system and the needs of the

end-user. This is discussed further in “System Design Considerations” on page 143.

Good Signal Poor Signal

Disabled

no icon

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Motorola MOTOTRBO SYSTEM PLANNER Specifications Page 43