112
Operation
Chapter 4 - Operation and Administration
4.8.4.3.1.1
ID Parameters
The Operator ID, Cell ID and Sector ID constitute together the Base Station ID,
which is the unique identifier of the AU. An SU can be authenticated by the AU
only if its defined parameters match the Base Station ID configured for the AU.
The Operator ID and Cell ID are defined for the Base Station (see
Section 4.4.2.4
)
and are used by all AUs in the Base Station. In the AU's MAC Parameters menu
they are available only in the Show option.
The Sector ID parameter consists of three digits in the range of 0 to 255.
The default Sector ID is 206.
Changes in Sector ID are applied only after reset.
4.8.4.3.1.2
ARQ Enable/Disable
The ARQ Enable/Disable parameter controls whether to use an ARQ algorithm for
detecting errors and requesting retransmissions of applicable unicast messages
(applicable only for Best Effort and Non Real Time services).
The default is Disable.
4.8.4.3.1.3
Maximum Cell Radius
The Maximum Cell Radius is used to adapt various timing parameters of the MAC
to the time it takes a message to reach its destination. This time delay is
dependent upon the distance between the originating and receiving units. The
timing parameters should be adapted to the largest expected delay, which is
determined from the distance from the AU of the farthest SU served by it.
The basic time element (symbol) used by the system is 68 microseconds. This
symbol size is translated to a round trip delay of approximately 20 km, or a cell
radius of 10 km. Thus, it is recommended to set the Maximum Cell Radius using
a resolution of 10 km: the actual timing of the system is the same for any cell
radius larger than N*10 km and smaller than or equal to (N+1)*10.
The values range is from 10 to 110 km. Use 10 km increments (10, 20, ….110).
NOTE
For Non-Line-Of-Sight (NLOS) links using refractions, the cell distance should be higher than the
line-of-sight distance. Typically a 10% margin is a good estimate for the increase in distance due to
the NLOS operation.
NOTE
An SU located at a distance larger than the Maximum Cell Radius will be rejected during the
network entry process.
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