ZXG10 BS21 (V2.2) Compact Outdoor BTS for GSM Maintenance Manual
170
Confidential and Proprietary Information of ZTE CORPORATION
When the second step is also performed stably, cautiously consider adding
the cells of different frequency bands into their respective lists of adjacent
cells. As a result, the dual band handover can be performed between the
adjacent cells of different frequency bands. But, it is recommended that
this step be only performed in the cells in the coverage edge of the same
frequency band. That means, in most coverage areas, the handover of a
mobile phone being used is between the cells of the same frequency band,
and the dual band handover occurs only when this mobile phone reaches
the edge cell of this frequency band.
Adjusting Wireless Parameters
When the wireless parameters of the cell are configured, the OMCR default
values are often used. But some default values are not suitable for the
current conditions and need be adjusted properly (including uplink and
downlink), as shown in Table 19.
T
A B L E
1 9
D
E S C R I P T I O N O F
W
I R E L E S S
P
A R A M E T E R S
C
O N F I G U R A T I O N
Parameter
Original
Default
Value
Adjusted
Value
Description
Minimum receiving
level
-105 dBm
-100 dBm
Currently, great transmitting power of
the cells causes too large overlapped
coverage area between the adjacent
cells. Add this parameter to artificially
reduce the valid coverage area of the
cell and enhance the successful perfect
access of the mobile phone.
For the outward cell in the edge area,
this value can be reduced if more
coverage range is really need (namely,
there is access request in the place
under -100 dBm)
Location update cycle
(T3212)
0.5 h
6 h
Normally the traffic during
commissioning is not too large, so the
location update every 30 minutes is
unnecessary.
If the cell has large traffic, this value can
be set as 20 h or higher to greatly
reduce the signaling traffic of the
network, enhance the standby time of
the mobile phone and enhance the
utilization ratio of the radio resource.
Adjacent cell average
window value in
handover
measurement handling
6 10
Increasing the average sample of the
adjacent cell measurement value can
decrease the sensitivity to the signal
fluctuation, so that, there will be no
frequent cell handover in the large
overlapped coverage area of the
adjacent cells. Make sure to add the
reserved value to 10.
