Reference Manual

Synchronization
31.8 FN-Offset
Purpose
The purpose is to improve handover performance. If one RBS is
configured for several cells and handover is done between two cells
controlled by the same RBS, the handover execution time will be longer
if the two cells are synchronized together.
Precondition and Initiation
The function is initiated by a request from the BSC.
Description
The FN (Frame Number) offset function makes it possible for a TRU at
a site to use a defined offset from the TDMA number distributed from
the central timing of the RBS. The offset value is added to the
distributed TDMA frame number.
The offset is configurable from the BSC per timeslot, the condition is
that all timeslots must be disabled. Configuration of one timeslot will
reconfigure all the others. The configuration is carried out by the
Functionality Administration function.
31.9 ESB Distribution
Purpose
This function defines that the timing information is distributed on the
ESB interface, when TF mode is defined or changed to master.
Precondition and Initiation
The function is initiated by two separate events:
• At TF enable when TF mode is defined to master
•
At TF configuration in enabled state when TF mode is changed to
master
Description
The timing information is distributed on the ESB interface and the ESB
measurement loop is closed. The function is terminated when TF state
is changed from enabled, or TF mode is changed from master.
31.10 Timing Compensation
Purpose
This function displaces the internal timing bus towards the ESB with
the TF compensation value received at TF configuration.
Precondition and Initiation
At TF configuration when TF mode is defined to Slave.
254 (421)
EN/LZT 720 0008 R1A
2001-06-26
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