Telrad BreezeCOMPACT System Manual page 86

Chapter 3 - Operation and AdministrationBS Menu
Chapter 3 - Operation and Administration
3.7.2.5 Feedback
The Feedback menu enables viewing/updating the values configured for the following parameters:
IR CDMA Allocations Period
Start of Ranging Codes Used
Maximum Cell Radius
Ducting Mitigation Mode
3.7.2.5.1 IR CDMA Allocations Period
The period of IR CDMA allocations (Initial Ranging Interval), in frames.
The available options are 1, 2, 4, 6, 8, 10. The default is 2.
A change in IR CDMA Allocations Period will take effect after next reset.
3.7.2.5.2 Start of Ranging Codes Used
The starting number of the group of codes used for the uplink.
The available options are 0, 64, 128, 192. The default is 0.
A change in Start of Ranging Codes Used will take effect after next reset.
3.7.2.5.3 Maximum Cell Radius
The maximum cell radius (in km).
The available values are 1, 2, 4, 8, 15, 23. 30. The default is 2.
A change in Maximum Cell Radius will take effect after next reset.
3.7.2.5.4 Ducting Mitigation Mode
Sudden changes in the atmosphere's moisture and temperature profiles can on random occasions make
radio signals propagate hundreds of kilometers and even more, far beyond the normal radio-horizon.
When a BS suffers from such tropospheric ducting phenomena causing reception of a relatively strong
signal transmitted by a very far BTS, the Ducting Mitigation feature enables increasing the time period
between DL and UL transmissions to reduce potential interference effects. This is achieved by adding DL
Silenced Symbols and, if necessary, changing the number of Extra TTG slots (see below). This results in
reducing the actual UL Duration by 1 slot (Medium Ducting Mitigation Mode) or 2 slots (High Ducting
Mitigation Mode) without affecting the number of DL symbols (for the same combination of Configured
Total Uplink Duration and Maximum Cell Radius).
Note that for certain values of configured Total Uplink Duration the High and/or Medium options are not
available since the minimum uplink duration is 4 slots for a BS bandwidth of 5/10 MHz or 3 slots for a BS
bandwidth of 7 MHz.
The options are None, Medium or High.
The default is None.
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