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It is desirable to have many base stations per board, as long as there are
channels available, in order to increase the location area and reduce the
signalling.
For low user densities (less than 4 users per 100 m
2
), the available
channels per base station may be more than what is needed to support
the portables in the coverage area of the base station. In such a case, it
is desirable to have many base stations per ELU31 board.
4.4.2
ELU31 with 16 channels
For high user densities (more than 4 users per 100 m
2
), where the
number of base stations is determined not by the areas to be covered,
but by the number of portables to be served the maximum capacity of an
ELU31 board with 16 channels is reached with 3 base stations, see
Table 9, Number of portables (stationary users) per ELU31 board per
base station (with 16 channels).
4.4.3
ELU31 with 32 channels
For high user densities (more than 4 users per 100 m 2), where the
number of base stations is determined not by the areas to be covered,
but by the number of portables to be served the maximum capacity of an
ELU31 board with 32 channels is reached with 6 base stations, see
Table 7, Number of portables (stationary users) per ELU31 board per
base station (with 32 channels).
4.4.4
Utilization of ELU31 boards and MGWs
The maximum number of ELU31 per media gateway is determined by
power consumption of the board it self and the line length to its radio
base station and the power consumption of the base station. See section
2.2 ELU31 Boards on page 6 for typical configuration. See Installation
instruction for detail about power calculation.
4.4.5 Signaling/Roaming
traffic
A rough rule of thumb is that a roaming between two different ELU31
boards connected to different Servers (inter Server roaming) event loads
the system for about 1/10 of a call. A roaming between two different
ELU31 boards connected to the same Server (intra Server roaming) is
less than 1/10 of a call. Moving between different base stations on the
same ELU31 board does not cause roaming events.
