Motorola MTM800 - 9.5 Subscriber Class; 9.6 Local Site Trunking (LST)

Mobility Services 2-31
September 2008
Chapter 2 - MTM800 Product Information Manual 6866537D87-F
serving cell, or when the terminal has totally lost the serving cell, the terminal will employ cell
reselection procedures employing the following methods as described in [Ref 1] clause 18.3.4.7.1
1. If not in a call:
• Undeclared
Cell reselection
2. If in a call and not transmitting or link failure occurs:
• Unannounced
Cell-reselection
3. If transmitting in a call, and a neighbor has been scanned, and the cells are synchronized:
• Announced Type-2
cell reselection
4. If transmitting in a call and no neighbor has been scanned or the cells are not synchronized:
• Announced Type-3
cell reselection
For compatibility with systems that do not support U-PREPARE containing a cell ID parameter, the
terminal can be provisioned to never perform Type 2 cell reselection.
The terminal will decide the need for cell reselection, based on comparison of the signal strength
and the service level between the serving cell and neighbour cells. The service level criteria shall be
based on the following criteria which are listed in priority order:
• System Wide Services available (Local/Wide Trunking)
• Security Class
• Subscriber Class
• Location Area (Home Location area)
• Cell Load
The terminal will always prefer a cell that has a higher service level to one with a lower service level.
If the terminal is operating on a serving cell that has a lower service level than a neighbour cell, the
terminal will roam to the neighbour, even during a call.
9.5 Subscriber Class
When the terminal registers on a cell that does not support any of its subscriber classes, it will only
participate in services that have emergency priority.
9.6 Local Site Trunking (LST)
This that allows a base station to operate as stand alone when the link to the zone controller has
gone down. The terminal will limit functionality when the cell is in this mode.
If system wide broadcasts indicate that system wide services are not available (LST) on a cell, a
terminal will only register on the cell if there are no system wide cells available.
When the terminal is operating in LST it goes into DMO and will prevent the user from invoking the
following services:
• Private Call
• Phone Call
• PABX Call
• Packet Data
Whilst operating in LST, the terminal is always searching for a cell with system wide capability and
will switch to such a cell as soon as possible.